Why choose forged steel over cast steel for jackup pinion shafts?

Forged steel has 30-50% higher fatigue strength, better impact toughness, and zero internal voids versus cast steel's random grain structure and casting porosity. ABS, DNV, and Lloyd's Register mandate forged steel for jackup pinion shafts; cast steel fails ASTM A388/SEP 1921 Level 3 UT acceptance criteria and is not accepted by classification society surveyors.

What certifications can Jiangsu Liangyi provide?

ABS, DNV, Lloyd's Register (LR), Bureau Veritas (BV), API 6A. All with MTC EN10204 3.1 or 3.2. Third-party witness inspection by SGS, BV, or DNV available on request.

What are the product specification ranges?

OD: 200-1800mm. Length: up to 15,000mm. Weight: up to 30 tons. Module: m30-m80. Tooth profile: involute, API 6A compatible. Accuracy: ISO 1328-1 Grade 5-7 / AGMA Class 10-12. Surface roughness: Ra≤0.8-1.6μm (tooth flank). Straightness: ≤0.05mm/m. All per customer drawing.

Can Jiangsu Liangyi make OEM replacement jackup pinion shafts?

Yes. OEM interchangeable with NOV LeTourneau, Cameron, Schlumberger systems. From customer drawings or reverse engineering. CNC tolerance up to IT6, AGMA Class 12 gear accuracy verification.

What NDT inspection is applied?

Full volumetric UT per ASTM A388/EN10228/SEP 1921; MT and PT surface inspection; 3D CMM dimensional inspection; CNC gear measuring center tooth profile and lead accuracy; Charpy impact at -20°C or -40°C; metallographic grain size verification. All documented in MTC EN10204 3.1/3.2.

How are forged jackup pinion shafts packaged for export?

Rust-inhibiting oil + VCI compound on all machined surfaces; VCI polyethylene film wrapping (24-month protection); steel end caps on both shaft ends; foam and steel angle guard protection on tooth zone; ISPM 15 fumigated wooden crate with precision cradles and steel strap tie-downs; full crate marking with part number, heat number, weight, lift points, and destination.

What warranty is provided?

12-month quality warranty covering material, forging, heat treatment, and machining defects. Lifetime technical support for installation, operation, and maintenance. Free pre-order technical consultation for first-time customers.

Forged Steel Jackup Pinion Shafts For Offshore Jack-up Rigs | China Manufacturer

Q: What is a jackup pinion shaft?

A jackup pinion shaft is the core rotary transmission component of the rack-and-pinion jacking system on an offshore jack-up rig. It meshes with the rack teeth on the rig's legs to convert drive motor rotation into vertical linear movement. A typical modern jack-up rig requires 24-96 pinion shafts total. They must withstand loads exceeding 10,000 metric tons per leg, salt spray corrosion, and continuous operation — requiring forged alloy steel such as AISI 4330V Mod, mandated by ABS, DNV, and LR.

Q: What material grades are available for forged jackup pinion shafts?

AISI 4330V Mod (most common, API 6A, tensile strength ≥180,000 psi), AISI 4340V Mod, 34CrNiMo6, 30CrNiMo8, 42CrMo4, 18CrNiMo7-6, AISI 4130, ASTM A350 low-temperature grades, duplex stainless steel, Inconel, and Monel for NACE MR0175 sour service environments.

Q: What is the delivery lead time?

Standard grades and sizes: 25-30 working days. Custom grades or large orders (>10 tons): 45-60 working days. Ships from Shanghai, Ningbo, Shenzhen, or Qingdao via FCL or OOG flat-rack container.

Custom Forged Steel Jackup Pinion Shafts for Offshore Jack-up Rigs – Jiangsu Liangyi ISO 9001:2015 Certified Forging Manufacturer, Jiangyin, Jiangsu, China

Quick Summary: Jiangsu Liangyi Co., Limited, established in 1997 in Jiangyin City, Jiangsu Province, China, is an ISO 9001:2015 certified open die forging manufacturer specializing in custom forged steel jackup pinion shafts for offshore jack-up rigs. Products can be supplied with ABS, DNV, Lloyd's Register (LR), and Bureau Veritas (BV) classification society certification upon request (per order). Maximum capacity: 30 tons / 15 m / 1,800 mm diameter. Lead time: 25–60 days. 50+ countries served. Contact: sales@jnmtforgedparts.com | +86-13585067993.

30 tMax Weight

15 mMax Length

1,800 mmMax Diameter

25–60 dLead Time

50+Countries Served

ABS·DNV·LR·BVAvailable Upon Request

As a professional open-die forging manufacturer certified to ISO 9001:2015, located in Chengchang Industrial Park, Jiangyin, Jiangsu Province — China’s core forging industry cluster — Jiangsu Liangyi specializes in manufacturing high-performance forged steel jackup pinion shafts for offshore mobile jack-up rigs, jack-up drilling units, and jacking systems of self-elevating platforms. Founded in 1997 with over 25 years of forging expertise, we provide a full range of custom solutions from steel melting, precision forging, controlled heat treatment, to final CNC machining, fully meeting international standards and customer detailed drawings. Our forged jackup pinion shafts serve as main transmission parts in offshore jack-up rig lifting systems, engineered to endure harsh offshore operating conditions: heavy alternating loads, salt spray corrosion, low-temperature impact, and long-term continuous service. We have supplied high-quality pinion shafts to offshore engineering and oil & gas projects in more than 50 countries across the North Sea, Middle East, Southeast Asia, Gulf of Mexico, and Brazil.

Full In-House Production

From 30t EAF + LF + VOD steel melting to 6300T hydraulic forging press, 5-axis CNC machining and full NDT inspection — no outsourcing, total quality control.

Global Classification Certification Available

Products can be supplied with ABS, DNV, LR, and BV classification society certification upon request (per order), compliant with ISO 3730, ASTM, EN, and API 6A standards, with full traceable MTC EN10204 3.1/3.2.

Custom Heavy-Duty Capacity

Max single-piece 30 tons / 15 meters / 1,800 mm. OEM-equivalent replacement shafts compatible with NOV (National Oilwell Varco) LeTourneau systems, Cameron, and Schlumberger specifications. (Brand names referenced for compatibility identification only. Jiangsu Liangyi is not affiliated with or endorsed by these companies.)

Strict 100% NDT Inspection

Full volumetric UT, MT, PT per ASTM A388, EN10228, or SEP 1921 — zero-defect delivery. ABS, DNV, LR, BV classification society witness inspection available upon request per order.

What Is A Jackup Pinion Shaft & How Does The Rack-and-Pinion Jacking System Work?

Understanding the operating principle of a jack-up rig’s jacking system is essential for choosing the correct specification for forged pinion shafts.The jacking system is the critical mechanism that lifts the entire platform hull out of the water or lowers it back into place, allowing the rig to operate stably at a fixed position on the seabed.

Rack-and-Pinion Jacking System — Working Principle

Understanding the working principle of the jack-up rig jacking system is essential for choosing the right forged pinion shaft specification.The jacking system is the critical mechanism that lifts the entire platform hull out of the water or lowers it back down, allowing the rig to operate stably at a fixed position on the seabed. Each leg of a jack-up rig is equipped with a continuous toothed rack, either an integrated chord rack or a separate rack-and-pinion assembly.Multiple electric or hydraulic drive motors, each coupled to a reduction gearbox, drive the jackup pinion shaft, whose gear teeth mesh directly with the rack teeth on the leg chord.As the motors turn, the pinion shaft rotates, and the meshing between pinion and rack produces vertical thrust that moves the leg — and thus the hull — up or down. A typical modern jack-up rig has 3 to 4 legs, with each leg driven by 8 to 24 independent pinion drive units.This means a single rig may require 24 to 96 pinion shafts in total.The total vertical load transmitted through the pinion shafts during lifting can exceed 10,000 metric tons per leg.During drilling operations, pinion shafts are continuously subjected to dynamic alternating loads from wave motion, wind forces, and drill string reaction — over years of uninterrupted service, with zero failure allowed.The pinion shaft is therefore not a standard drive shaft. It must simultaneously transmit high torque, absorb shock loads from environmental forces, resist salt spray and seawater corrosion, and maintain precise gear geometry over years of continuous operation. This is why classification societies including ABS, DNV, and Lloyd’s Register mandate open die forged alloy steel with a minimum tensile strength of 180,000 psi (1,241 MPa).Cast steel simply cannot deliver the required fatigue life, low-temperature impact toughness, or sound, defect-free internal structure under such extreme service conditions.

The main design parameters of a jackup pinion shaft — including module (typically m30–m80 for jackup applications), number of teeth, pitch circle diameter, helix angle, involute tooth profile, and journal dimensions — are all determined by the individual jacking system design of each rig model. At Jiangsu Liangyi, we manufacture pinion shafts to meet customer-supplied engineering drawings.Full CNC precision machining and gear accuracy inspection are performed to ISO 1328‑1 Grade 5–7 or AGMA Class 10–12, ensuring ideal rack meshing geometry and consistent load distribution under full operating loads.

Why Forged Steel Outperforms Cast Steel For Jackup Pinion Shafts

Classification societies including ABS, DNV, and Lloyd's Register all mandate forged steel for jackup rig pinion shafts. The fundamental difference lies in the internal grain matrix of the finished part, which directly determines fatigue life, impact resistance, and NDT acceptability under offshore critical parts standards.

Forged Steel vs. Cast Steel — Technical Comparison For Jackup Pinion Shaft Applications
Comparison Item	✔ Open Die Forged Steel	✘ Cast Steel
Internal Grain Structure	Continuous, refined, directional grain flow — eliminates internal voids and inclusions	Random, coarse, dendritic grain — inherently prone to shrinkage cavities, porosity, and inclusions
Fatigue Strength	30–50% higher than cast equivalents — critical for millions of rack-pinion engagement cycles over rig lifetime	Lower fatigue strength; early fatigue cracking at stress concentration points under alternating offshore loads
Tensile Strength	≥ 180,000 psi (≥ 1,241 MPa) for AISI 4330V Mod Q+T	Typically 90,000–120,000 psi — insufficient for full jacking load requirements per ABS/DNV rules
Impact Toughness (Charpy, −20°C)	≥ 20 ft·lbs longitudinal / ≥ 15 ft·lbs transverse — suitable for North Sea and Arctic operations	Poor and inconsistent — cannot reliably meet classification society low-temperature impact requirements
NDT Internal Soundness (UT)	Meets ASTM A388 / SEP 1921 Level 3 / EN10228 UT acceptance criteria with no reportable defects	Frequently fails volumetric UT due to casting porosity, shrinkage, and inclusions — rejected by ABS/DNV/LR surveyors
Classification Society Acceptance	Fully required by ABS, DNV, LR, BV for MODU jacking systems; explicitly specified in rig design standards	Not accepted for critical jacking system pinion shafts per ABS Rules for Building and Classing MODUs
Gear Accuracy Achievable	ISO 1328-1 Grade 5–7 / AGMA Class 10–12 by CNC gear profile grinding after Q+T heat treatment	Dimensional variation from pattern shrinkage; high-accuracy gear grinding difficult on porous cast surface
Surface Hardness	40–45 HRC achievable uniformly throughout cross-section by Q+T heat treatment	Significant hardness variation due to uneven cooling rates and material segregation during solidification
Corrosion Resistance (Offshore)	Dense, uniform microstructure; optional duplex SS, Inconel, or Monel grades for NACE MR0175 sour service	Porous surface accelerates galvanic and pitting corrosion in marine saltwater environments
Full Traceability & Documentation	Complete heat number traceability, MTC EN10204 3.1/3.2, classification society stamping, 3rd-party witness	Incomplete documentation chain; not accepted for ABS/DNV/LR certified offshore components

In summary: For jackup pinion shafts that endure extreme alternating loads, corrosive marine environments, and strict certification requirements, open‑die forged steel is the only technically valid and classification‑society‑approved solution. Jiangsu Liangyi uses only certified open‑die forging with a minimum forging ratio of 3:1 — and up to 6:1 for important sections — to guarantee maximum grain refinement and consistent, defect-free internal soundness throughout the shaft.

Standard & Custom Material Grades For Offshore Jackup Pinion Shafts

We supply forged jackup pinion shafts in a wide range of industry-recognized material grades, which meet different offshore working conditions — from low-temperature service in the North Sea to sour corrosion resistance in Middle East oil & gas fields. For a complete list, please visit our Materials page. Following are commonly used grades :

High-Strength Carbon & Alloy Steel: C45, 42CrMo4, S355J2G3, 16MnCr5, 34CrNiMo6, 30CrNiMo8, 18CrNiMo7-6, AISI 4130, AISI 4340V Mod, AISI 4330V Mod (API 6A compliant) — the most common grade for jackup pinion shaft applications worldwide
Martensitic & Precipitation Hardening Stainless Steel: X4CrNiMo16-5-1, AISI 410, AISI 630 (17-4PH) — for moderate corrosion resistance combined with high strength requirements
Low-Temperature Toughness Steel: ASTM A350 compliant grades — for offshore projects in cold regions with −40°C Charpy impact requirements (North Sea, Arctic operations)
Corrosion-Resistant Alloys: Duplex stainless steel, Inconel 625, Monel K-500 — for sour service (NACE MR0175 compliant) and high-salinity offshore environments
Optional VIM+ESR Double Smelting: For superalloy grades and ultra-high-purity critical components requiring maximum cleanliness and inclusion control

We also support custom material formulation based on your specific working condition requirements, with full chemical composition analysis and mechanical property verification before mass production.

Full-Process Manufacturing Flow For Forged Jack-up Rig Pinion Shafts

We implement a strict full-process quality control system for all forged steel jackup pinion shafts, supported by a standardized 10-step manufacturing flow that guarantees consistent product quality and complete traceability.All production is carried out entirely in-house at our facility in Jiangyin City, Jiangsu Province, China — equipped with a 6300T hydraulic forging press, 2000T high-speed forging machine, more than 10 heat treatment furnaces, and 5-axis CNC machining centers.

Certified Ingot Smelting — 30t EAF + LF + VOD vacuum degassing, to control gas content and impurity level to the lowest achievable values
Uniform Pre-Heating Treatment — to ensure consistent material structure and avoid forging cracks during high-reduction forming
Precision Open Die Forging — minimum 3:1 forging ratio, up to 6:1 for important sections, to refine grain structure and maximize fatigue resistance
Preliminary Heat Treatment — Normalizing + Tempering, to eliminate internal stress and homogenize microstructure for subsequent machining
Raw Material Inspection & Dimension Pre-Check — chemical composition analysis by OES and dimension test against drawing
Rough Machining — reserved machining allowance (typically 5–10 mm per side) for final finishing after heat treatment
Full Volumetric Ultrasonic Testing (UT) — 100% internal defect elimination per ASTM A388, EN10228, or SEP 1921 Level 3
Secondary Precision Heat Treatment — Quenching + Tempering, to achieve the required hardness (40–45 HRC), strength, and toughness balance for offshore heavy-load service
CNC Finishing Machining — tolerance control up to IT6 level for journal surfaces; gear tooth profile grinding to ISO 1328-1 Grade 5–7 or AGMA Class 10–12
Final Full Inspection & Certification — 100% dimensional check, complete NDT suite, mechanical property testing, gear accuracy verification, and MTC EN10204 3.1/3.2 documentation

Strict Quality Inspection & Certification System

All finished jackup pinion shafts are given rigorous inspection before delivery, making sure they all meet offshore industry standards, classification society requirements, and customer technical specifications. Our inspection items include:

Precision Chemical Composition Analysis by OES (to verify material grade consistency against certified heat certificate)
Full Volumetric Ultrasonic Test (UT) per ASTM A388, EN10228, or SEP 1921 standard
Magnetic Particle Test (MT) and Penetrant Test (PT) for surface and near-surface defect detection
Full Dimension test using 3D Coordinate Measuring Machine (CMM), to make sure all parts meet drawing tolerances
Gear Tooth Profile & Lead Accuracy Inspection by CNC gear measuring center (to ISO 1328-1 or AGMA 2000 standard)
Room & Low Temperature Mechanical Property Test (tensile strength, yield strength, elongation, reduction of area, Charpy impact at −20°C or −40°C as required)
Metallographic Microstructure Test (to verify ASTM grain size number and forging quality)
Hardness Test by portable hardness tester (uniform distribution check along full shaft length and cross-section)

Complete quality documentation — including all test reports, heat treatment records, and MTC EN 10204 3.1/3.2 — is supplied with every shipment to guarantee full batch traceability.All finished jackup pinion shafts can be provided with ABS, DNV, Lloyd's Register, or Bureau Veritas classification certification upon order request, and manufactured in full compliance with ISO 3730.Third-party witness inspection by SGS, BV, or DNV is available as needed.

Mechanical Properties By Material Grade — Forged Jackup Pinion Shafts

The following table lists guaranteed minimum mechanical properties for the most commonly used material grades for offshore jackup pinion shafts at Jiangsu Liangyi, all in the Quenched & Tempered (Q+T) condition. Custom heat treatment parameters to get intermediate property levels are available on request.

Guaranteed Minimum Mechanical Properties — Quenched & Tempered (Q+T) Forged Jackup Pinion Shafts
Property	AISI 4330V Mod (Most Common — API 6A)	AISI 4340V Mod	34CrNiMo6 (EN 1.6582)	42CrMo4 (EN 1.7225)	30CrNiMo8 (EN 1.6580)
Tensile Strength (Rm)	≥ 180,000 psi ≥ 1,241 MPa	≥ 185,000 psi ≥ 1,276 MPa	≥ 1,100 MPa	≥ 900 MPa	≥ 1,050 MPa
Yield Strength (Rp 0.2%)	≥ 165,000 psi ≥ 1,138 MPa	≥ 170,000 psi ≥ 1,172 MPa	≥ 900 MPa	≥ 750 MPa	≥ 900 MPa
Elongation (A%)	≥ 12%	≥ 11%	≥ 12%	≥ 14%	≥ 12%
Reduction of Area (Z%)	> 46%	> 45%	≥ 50%	≥ 50%	≥ 50%
Surface Hardness	40–45 HRC	40–46 HRC	321–375 HBW	250–310 HBW	310–370 HBW
Charpy Impact (−20°C, Longitudinal)	Avg ≥ 20 ft·lbs ≥ 27 J	Avg ≥ 18 ft·lbs ≥ 24 J	Avg ≥ 35 J	Avg ≥ 25 J	Avg ≥ 40 J
Charpy Impact (−20°C, Transverse)	Avg ≥ 15 ft·lbs ≥ 20 J	Avg ≥ 13 ft·lbs ≥ 18 J	Avg ≥ 25 J	Avg ≥ 18 J	Avg ≥ 27 J
−40°C Option Available	Yes (on request)	Yes (on request)	Yes (on request)	Limited	Standard
Primary Application	Standard jackup pinion shaft; API 6A compliant jacking systems	Heavy-duty high-load jackup shafts; maximum strength requirement	European rig standards; balanced strength and toughness	Light-duty jacking parts; cost-effective option	Large-section shafts; high toughness priority

All values are guaranteed minimums based on standard Q+T heat treatment. For NACE MR0175 sour service environments, duplex stainless steel, Inconel 625, or Monel K-500 grades are also available — please contact us with your detailed requirements.

Product Specification Parameters — Forged Steel Jackup Pinion Shafts

The specification ranges below reflect Jiangsu Liangyi’s standard manufacturing capacity for forged steel jackup pinion shafts.We may also accommodate dimensions outside these ranges — please contact us with your project details.All final dimensions, gear tooth geometry, and mechanical properties are produced to meet customer-provided engineering drawings.

Shaft Outer Diameter (OD)

200 mm – 1,800 mm

Larger diameters achievable on request

Total Shaft Length

Up to 15,000 mm (15 m)

Including journal sections and gear tooth zone

Max Single-Piece Weight

Up to 30,000 kg (30 t)

6300T hydraulic forging press capacity

Gear Module (m)

Typically m30 – m80

Per customer drawing; other modules available

Tooth Profile

Involute (standard)
API 6A rack-profile compatible

Spur or helical per drawing

Tooth Accuracy Grade

ISO 1328-1 Grade 5–7
AGMA Class 10–12

Verified by CNC gear measuring center

Surface Roughness — Tooth Flank

Ra ≤ 0.8 – 1.6 μm

Achieved by gear profile grinding after Q+T

Surface Roughness — Journals

Ra ≤ 1.6 – 3.2 μm

CNC finish turning and cylindrical grinding

Shaft Straightness Tolerance

≤ 0.05 mm/m

Verified on precision V-block with dial gauge

Dimensional Tolerance

Up to IT6 level

3D CMM inspection for all critical features

Surface Hardness (AISI 4330V Mod)

40–45 HRC uniform

Verified along full shaft length and cross-section

Minimum Forging Ratio

3:1 standard / 6:1 critical sections

Ensures refined grain and maximum fatigue resistance

Global Applications & Offshore Rig Types

Our forged steel jackup pinion shafts are widely used across multiple types of offshore engineering projects and self-elevating platform systems, including:

Mobile Offshore Drilling Units (MODUs): Jack-up drilling rigs for oil & gas exploration and development in shallow water (typically 8–175 meters water depth)
Offshore Wind Turbine Installation Vessels (WTIVs): Self-elevating jack-up vessels for offshore wind turbine and foundation installation in the North Sea, Baltic Sea, and East Asia
Jack-up Offshore Accommodation Platforms: Movable jacking systems for offshore living quarters and crew change platforms
Jack-up Workover & Well Servicing Platforms: Self-elevating platforms for well intervention, workover, and plug & abandonment operations
Offshore Construction & Heavy Lift Platforms: Self-elevating platforms for offshore pipeline, cable, and jacket installation work

With an annual manufacturing capacity of 120,000 tons and a factory covering 80,000 m² in Jiangyin City, Jiangsu Province, China, we support both one sample orders and large-volume mass production orders. Products are shipped from Shanghai, Ningbo, Shenzhen, and Qingdao ports worldwide.

Global Market Supply Experience & Regional Project References

Over more than 25 years, Jiangsu Liangyi has established long-term supply partnerships with offshore engineering companies, drilling contractors, and shipyards in over 50 countries. The following regional references reflect our main supply markets and typical application experience for forged steel jackup pinion shafts:

North Sea / Europe

Jack-up Drilling Rig Pinion Shaft Replacement

Material: AISI 4330V Mod / 34CrNiMo6
Certification: DNV / Lloyd's Register — available upon request per order, MTC 3.2 with surveyor witness
Key Requirements: −40°C Charpy impact, NORSOK M-630 corrosion protection, ISO 1328-1 Grade 6 gear accuracy
Application: Replacement pinion shafts for 3rd-generation harsh-environment jack-up drilling rigs operating in the Norwegian and Danish sectors of the North Sea

Middle East / Arabian Gulf

Jack-up Workover Platform Pinion Shafts

Material: AISI 4330V Mod / Duplex SS for sour service
Certification: ABS / Bureau Veritas — available upon request per order, MTC 3.2
Key Requirements: NACE MR0175 sour service compliance, high-temperature stability to 120°C, ABS type approval
Application: Multi-unit supply for jack-up well servicing platforms operating in the Arabian Gulf carbonate reservoir oil fields

Southeast Asia / Asia Pacific

Offshore Wind Turbine Installation Vessel (WTIV)

Material: 30CrNiMo8 / AISI 4340V Mod
Certification: DNV / Lloyd's Register — available upon request per order, MTC 3.2
Key Requirements: High fatigue life for repeated leg cycles, AGMA Class 12 gear accuracy, full set of 40+ pinion shafts per vessel
Application: New-build offshore wind turbine installation jack-up vessels for Taiwan Strait and South China Sea offshore wind farm projects

Gulf of Mexico / Americas

Jack-up Drilling Rig OEM Replacement Parts

Material: AISI 4330V Mod (API 6A compliant)
Certification: ABS / API 6A — available upon request per order, MTC 3.2 with ABS surveyor witness
Key Requirements: OEM fit-size interchangeable with NOV LeTourneau jacking systems; full first-article dimensional inspection
Application: OEM-equivalent replacement pinion shafts for 2nd and 3rd generation jack-up drilling rigs operating in the Gulf of Mexico and offshore Brazil

West Africa

Jack-up Accommodation Platform Pinion Shafts

Material: 42CrMo4 / 34CrNiMo6
Certification: Bureau Veritas — available upon request per order, MTC 3.1
Key Requirements: Salt spray resistance, extended 12-month VCI anti-rust packaging for site storage, BV 3.1 MTC
Application: Pinion shafts for self-elevating accommodation platforms supporting FPSO operations offshore West Africa

Oceania / Australia

Offshore Construction Jack-up Platform

Material: AISI 4330V Mod
Certification: Lloyd's Register (LR) — available upon request per order, MTC 3.2 with LR surveyor witness
Key Requirements: Cyclone-resistant design load capacity, full-penetration UT per AS/NZS, LR 3.2 MTC
Application: Heavy-duty pinion shafts for offshore construction jack-up platforms in the Timor Sea and North West Shelf gas field development

Delivery Time & Warranty Policy

We understand the importance of on-time delivery for offshore projects, and we have established a strict production scheduling and progress-tracking system to make sure project timelines are met. Following are our normal delivery lead times:

Standard material grades and sizes: 25–30 working days
Custom material grades or large-size orders (>10 tons): 45–60 working days
Rush orders (subject to capacity confirmation): Contact us for priority scheduling

We provide a 12-month quality warranty for all forged steel jackup pinion shafts, covering manufacturing defects in material, forging, heat treatment, or machining. You also get lifetime technical support for problems with installation, operation, and maintenance. For more product information, please visit our Products page or contact us directly.

Custom Order Process — From Inquiry To Delivery

Jiangsu Liangyi has developed a streamlined, transparent custom order process for forged steel jackup pinion shafts to shorten lead time and eliminate communication gaps between your engineering team and our production team. The complete process from initial inquiry to final delivery involves six clear steps:

Submit Inquiry & Drawing

Send your engineering drawing (PDF / DWG / STEP), material spec, quantity, certification scope, and delivery port to sales@jnmtforgedparts.com. We respond within 24 hours.

Technical Review & DFQ

Our engineering team checks the drawing to make sure it can be made and meets all standards. If necessary, a technical clarification list (DFQ) is sent out within 48 hours. If not, we go straight to the quote.

Material Selection & Quotation

Optimal material grade and heat treatment route confirmed. Formal quotation issued with unit price, lead time, certification scope, and payment terms (T/T or L/C accepted).

Order Confirmation & Production Planning

We send you a production schedule and assign a dedicated project manager as soon as we get your PO and deposit. At this point, a notification is sent to the classification society (ABS/DNV/LR/BV).

Production, Inspection & Certification

Full in-house manufacturing with milestone QC inspection reports shared at main stages (ingot, post-forge, pre-machining UT, final). Classification surveyor witness inspection arranged as needed.

Packaging, Shipment & Documentation

Products packed in ISPM 15 fumigated wooden crates with VCI rust protection. Full documentation package — MTC, inspection reports, packing list, B/L, certificate of origin — issued upon shipment.

We also offer a free technical consultation for first-time customers who want to make sure they are ordering the right material grade, specification, and certification scope for their specific jack-up rig model and operating environment. For prototype or trial orders, there is no minimum number of items that must be ordered.

Export Packaging & Shipping Specifications

Forged steel jackup pinion shafts are large, heavy, precision-machined components with critical tooth surfaces that must be protected from corrosion, mechanical damage, and moisture throughout the entire logistics chain — from our Jiangyin City factory to your destination port. Our standard export packaging procedure includes:

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Anti-Rust Surface Treatment

After the final inspection, all machined surfaces (tooth flanks, journals, bores, and end faces) are covered in oil that stops rust. A wax-based anti-rust compound is used as an extra layer of protection for long-distance shipments or items that will be stored for a long time (>90 days).

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VCI Film Inner Wrapping

The whole shaft is tightly wrapped in VCI polyethylene film, which makes a sealed environment for a vapor-phase corrosion inhibitor. VCI protection lasts for up to 24 months without needing to be reapplied. It works well for long sea freight trips and storage on site at remote offshore locations.

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Steel End Cap & Tooth Zone Protection

Both shaft ends are fitted with custom steel or heavy-duty plastic end caps to prevent end-face damage during handling. The gear tooth zone is protected with molded foam cushioning and rigid steel angle guards to prevent tooth tip chipping or deformation during transport.

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ISPM 15 Fumigated Wooden Crate

All pinion shafts are packed in purpose-built heavy-duty export wooden crates manufactured from ISPM 15-certified fumigated timber, complying with international phytosanitary import regulations required for customs clearance in the USA, EU, Australia, and most other markets.

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Secure Internal Blocking & Bracing

The shaft is supported on precision-machined wooden saddle cradles inside the crate, with adjustable steel strap tie-downs and foam blocking at all contact points. This prevents rolling, axial movement, and vibration damage during sea freight — even in rough seas or multi-modal transport.

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Crate Marking & Identification

Each crate is clearly labeled in English with: part number, heat number, material grade, gross weight, net weight, overall dimensions, lift point locations (with rated capacity), fragile/handle-with-care warnings, and destination port and consignee. All markings comply with IMDG and IATA labeling requirements.

Shipping Ports: Liangyi delivers forged jackup pinion shafts via Shanghai Port, Ningbo Port, Shenzhen Port, and Qingdao Port.We offer FCL (Full Container Load) and OOG flat-rack containers for oversized parts. Air freight is available for urgent small-batch orders.We provide a complete set of shipping documentation, including commercial invoice, packing list, bill of lading, certificate of origin, and all quality certificates, to ensure smooth customs clearance at any destination port worldwide.

Frequently Asked Questions About Forged Steel Jackup Pinion Shafts

What is a jackup pinion shaft and what does it do on an offshore jack-up rig?

A jackup pinion shaft is the main rotating transmission part of the rack-and-pinion jacking system on an offshore jack-up rig.It meshes with the rack teeth on the rig’s legs to convert drive motor rotation into vertical linear motion, allowing the rig to lift its hull above the water or lower its spud cans to the seabed.A typical modern jack-up rig requires 24 to 96 individual pinion shafts in total, and the total vertical load transmitted through these shafts can exceed 10,000 metric tons per leg.These parts must withstand severe alternating loads, salt spray corrosion, and years of continuous service — which is why classification societies such as ABS, DNV, and Lloyd’s Register mandate the use of open-die forged alloy steels including AISI 4330V Mod.

Why choose forged steel instead of cast steel for jackup pinion shafts?

Forged steel jackup pinion shafts feature a continuous, refined grain matrix aligned with the shaft contour, delivering 30–50% higher fatigue strength, superior impact toughness, and no internal voids.By contrast, cast steel exhibits a random dendritic grain matrix, shrinkage porosity, and casting inclusions that severely compromise performance. ABS, DNV, and Lloyd's Register explicitly require forged steel for critical pinion shafts in offshore MODU jacking systems.Cast steel cannot satisfy ASTM A388 / SEP 1921 Level 3 UT acceptance standards and is therefore rejected by classification society surveyors for this application.

What material grades are available for forged jackup pinion shafts?

The most commonly used grade is AISI 4330V Mod (API 6A compliant), it has tensile strength ≥180,000 psi and excellent fatigue resistance, so that it is the best choice material for standard jackup lifting systems. Other available materials include:AISI 4340V Mod, 34CrNiMo6, 30CrNiMo8, 42CrMo4, 18CrNiMo7-6, AISI 4130,ASTM A350 low-temperature grades (for −40°C applications in the North Sea and Arctic regions),duplex stainless steel,Inconel 625,and Monel K-500 for sour gas environments per NACE MR0175.

What classification society certifications can Jiangsu Liangyi provide?

Jiangsu Liangyi is able to certify forged steel jackup pinion shafts to ABS, DNV, Lloyd's Register (LR) and Bureau Veritas (BV).All products are supplied with a Material Test Certificate (MTC) conforming to EN 10204 3.1 or 3.2. We also provide API 6A certification and comply with ISO 3730, ASTM and EN standards.Third‑party witness inspection by SGS, BV or DNV is available upon request.

What are the available product specification ranges?

Shaft OD: 200–1,800 mm. Length: up to 15,000 mm. Max weight: 30 tons. Gear module: typically m30–m80. Tooth profile: involute, API 6A rack-profile compatible. Accuracy: ISO 1328-1 Grade 5–7 / AGMA Class 10–12. Surface roughness: Ra ≤ 0.8–1.6 μm (tooth flank), Ra ≤ 1.6–3.2 μm (journals). Straightness: ≤ 0.05 mm/m. All dimensions and tolerances are per customer engineering drawing.

Can Jiangsu Liangyi manufacture OEM replacement jackup pinion shafts for major rig brands?

Yes. Jiangsu Liangyi produces OEM‑equivalent interchangeable forged jackup pinion shafts, fully compatible with leading offshore rig jacking systems including NOV (National Oilwell Varco) LeTourneau, Cameron, and Schlumberger designs.(Brand names mentioned solely for compatibility reference; Jiangsu Liangyi is not affiliated with or authorized by these companies.)We manufacture using customer‑supplied drawings or reverse‑engineering data, with CNC precision machining controlled to IT6 tolerance grade and gear accuracy verified on a CNC gear measuring center up to AGMA Class 12.

What NDT inspection methods are applied to forged jackup pinion shafts?

Full volumetric Ultrasonic Testing (UT) in accordance with ASTM A388, EN 10228, or SEP 1921 Level 3;Magnetic Particle Testing (MT) and Penetrant Testing (PT) for surface and near-surface defect detection;3D CMM full dimension test ;tooth profile and lead accuracy verification on a CNC gear measuring center;room-temperature and low-temperature Charpy impact testing;and metallographic grain size verification per ASTM standards. All test results are fully documented and supplied in the MTC EN 10204 3.1/3.2 certificate.

What is the delivery lead time and what ports does Jiangsu Liangyi ship from?

For standard material grades and regular sizes, the production lead time is 25 to 30 working days. For orders using custom material grades or large-sized parts over 10 tons, the lead time will be 45 to 60 working days. We can also handle rush orders if our production capacity allows, just confirm with us in advance. We ship finished parts from Shanghai Port, Ningbo Port, Shenzhen Port or Qingdao Port, using full container load (FCL) or out of gauge (OOG) flat-rack containers for oversized items. We will provide a complete set of shipping papers to make sure customs clearance goes smoothly at your destination port.

How does Jiangsu Liangyi package forged jackup pinion shafts for export?

All machined surfaces are covered with rust-inhibiting oil and VCI compound, then wrapped in VCI polyethylene film (it can protect against corrosion for up to 24 months using vapor-phase technology). The ends of the shaft are protected with custom steel or heavy-duty plastic caps. The gear tooth areas are padded with foam and steel angle guards. Then the shaft is fixed in an ISPM 15-certified fumigated wooden crate, placed on precision saddle cradles and secured with steel straps. The crate is fully labeled with the part number, heat number, weight, lift points, and destination.

What warranty and after-sales support does Jiangsu Liangyi provide?

We provide a 12-month quality warranty, which covers all manufacturing defects related to materials, forging, heat treatment and machining. We also offer lifetime technical support to help with installation, operation and maintenance. For first-time customers, we provide a free pre-order technical consultation to make sure you choose the right specification for your needs. There is no minimum order quantity required for prototype or trial orders.