Forged Steel Blowout Preventer (BOP) Body Manufacturer | API 16A & NACE MR0175

Jiangsu Liangyi Company in China customizes forged steel blowout preventers for oil and gas well control systems, including single gate, double gate, triple gate and annular structure, supporting onshore, offshore, acidic service and deepwater projects.

API 16A & NACE Compliant Forging Steel Blowout Preventer BOP Body manufactured by Jiangsu Liangyi
Main product view of a forged steel blowout preventer body used in high-integrity oil and gas well control systems.

Blowout preventers (BOPs), as key safety barriers for drilling, completion and workover operations in oil and gas wells, have extremely high requirements for their structural integrity, fatigue resistance and corrosion resistance. Jiangsu Liangyi Co., Ltd., certified by ISO 9001:2015, manufacturing to API Spec 16A requirements, is a professional manufacturer of forged steel blowout preventer mechanisms. With over 27 years of open die forging experience, it serves the global oil and gas industry. Our forged blowout preventer valve bodies eliminate the porosity, shrinkage and structural defects of cast products, providing outstanding mechanical properties and a long service life under the most extreme onshore and offshore working conditions.

Product Overview

A forged steel blowout preventer (BOP) body is the pressure-containing housing used in ram or annular well control equipment. Compared with cast housings, a properly forged BOP body offers denser grain flow, lower internal defect risk, higher fatigue strength and better reliability for repeated pressure cycles, sour service and offshore drilling conditions.

  • API Spec 16A manufacturing basis
  • NACE MR0175 / ISO 15156 sour service options
  • Single, double, triple ram and annular configurations
  • 2000 PSI to 15000 PSI pressure classes
  • Standard and custom bores available
  • Worldwide technical and export support

How to Choose the Right Forging Blowout Preventer Body

If your project requires a forged steel BOP body, the first thing to determine is the nominal bore size, working pressure, service medium, temperature class, material grade and document requirements. For standard onshore wells, alloy steels such as 4130 or 4140 are usually used. For deep-water or high-temperature and high-pressure projects, higher performance grades such as 4340 or 4330V mod are usually chosen. For H2S or acid-containing environments,material selection and heat treatment must comply with NACE MR0175 / ISO 15156 requirements. Before placing an order, the buyer should also confirm the forging route, minimum forging ratio, NDE range, heat treatment, machining allowance and third-party inspection requirements.

Best use cases: onshore drilling, offshore drilling, workover stacks, HPHT wells, deepwater projects, sour gas fields and custom well control equipment built to client drawings.

Common BOP Body Buying Questions

What pressure range can be supplied?

Standard project coverage in this page spans from 2000 PSI to 15000 PSI, including low-pressure workover service and high-pressure offshore drilling requirements.

Which configurations are available?

Single ram, double ram, triple ram, annular and custom forged BOP body parts can all be produced according to standard or project-specific geometry.

Which standards matter most?

The main accordance topics are API Spec 16A, relevant material standards and, for sour service, NACE MR0175 / ISO 15156.

What should buyers verify before ordering?

Confirm bore, pressure, material, PSL level, temperature class, NDE scope, machining status, traceability package and delivery schedule before purchase approval.

Page Guide

Why Forged BOP Bodies Perform Better Than Cast Alternatives

For critical well control equipment, the body is not simply a shape-holding part. It is a pressure-retaining and load-bearing safety structure that must tolerate repeated pressure cycles, shock loading, low-temperature environments and, in many projects, corrosive media. This is why many EPC contractors and drilling equipment buyers prefer forged bodies when structural integrity and lifecycle reliability matter more than low initial cost.

Comparison Item Forged BOP Body Main Cast Body
Internal soundness Improved through forging reduction ratio and ultrasonic inspection Higher risk of shrinkage, porosity or internal discontinuities
Grain flow Refined and oriented to improve mechanical performance No forged grain refinement
Fatigue resistance Better for cyclic loading and repeated pressure service Usually lower for comparable geometry
Suitability for HPHT / offshore Well suited when material control and NDE are critical More sensitive to defect-control challenges
Custom metallurgy options Flexible for alloy, stainless and nickel-based grades More process constraints for some premium alloys

Full Range of Forged Steel BOP Body Configurations

We manufacture a complete line of forging steel blowout preventer bodies to meet all well control requirements, with full accordance to API Spec 16A standards. Our available configurations include:

  • Double Ram Blowout Preventer (BOP) Body
  • Single Ram Blowout Preventer (BOP) Body
  • Triple Ram Blowout Preventer (BOP) Body
  • Forging Steel Dual Ram BOP Body
  • Forged Steel Annular BOP Ram Bodies
  • Custom BOP Forging Parts per Client Drawings

Main Use Scenarios for Forged BOP Bodies

This product page is not limited to one drilling environment. The same forged-body manufacturing logic can be adapted to a wide range of well control uses when the material route, inspection level and machining details are matched to the service condition.

Onshore Drilling

Reliable forged housings for standard development wells, land rigs and routine well control operations where strength, machinability and delivery speed all matter.

Offshore Platforms

Suitable for offshore operators that need stronger quality control, traceability and confidence in pressure-containing structural performance.

HPHT and Deepwater

Premium alloy routes, higher inspection rigor and controlled process windows support projects facing high pressure, high temperature and complex loading cycles.

Sour Gas Fields

Material qualification, hardness control and documents become especially important when H2S service is involved.

Technical Specifications & Global Standards

Our forging steel BOP bodies are designed to meet the most stringent international standards and project requirements. We will provide a full set of traceable materials and certification for global oil and gas operations.

Nominal Bore Sizes

Standard sizes: 7-1/16", 11", 13-5/8", 20-3/4", 21-1/4"

Custom non-standard sizes available upon request

Pressure Ratings

2000 PSI to 15000 PSI full range coverage

Compatible with low-pressure workover to ultra-high-pressure deepwater drilling

Industry Standards

API Spec 16A (Latest Edition)

NACE MR0175/ISO 15156-1 (Sour Service)

ASTM, ASME, EN, DIN international standards

Performance Classifications

Material Class: AA, BB, CC, DD, EE, FF

Temperature Class: L, P, R, S, T, U, V

Product Specification Level: PSL1, PSL2, PSL3, PSL4

Premium Material Grades for All Working Conditions

We support a full range of material grades for BOP body forging and provide mill test certificate (MTC) EN 10204 3.1/3.2 for every batch. Our material can be used in both onshore and offshore drilling scenarios:

Material Category Available Grades Main Uses
Carbon & Alloy Steel AISI 4130, 4140, 4340, 4330V mod, 4145H mod, 8620, 8630, ASTM A694 F52-F70, A182 F11/F22 Standard onshore & offshore drilling, high-pressure well control
Stainless Steel AISI 410SS, 17-4PH, 15-5PH, A182 F6NM, F51, F53, F44, F55, F60, F61 Sour service, low-temperature, corrosion-resistant applications
Nickel-Based Super Alloys Inconel 625, 718, 725, X750, Incoloy 925, 945 Extreme HPHT, high-corrosion deepwater & sour gas projects

Guide to Material and Use Choice

The choice of materials should always follow the actual use range of the blowout preventer stack. The following table can help the purchasing team, design engineers and project managers quickly match the requirements of main blowout preventer bodies with common project conditions.

Use Condition Main Material Direction Why It Is Chosen
Standard onshore drilling AISI 4130 / 4140 Balanced strength, machinability and project economy
High-pressure offshore drilling AISI 4340 / 4330V mod Higher strength and toughness for demanding well control loads
Sour gas / H2S service NACE-compliant alloy or duplex grades Helps address sulfide stress cracking and corrosion concerns
Low-temperature offshore operations F6NM or qualified stainless grades Improved low-temperature toughness and corrosion resistance
Extreme HPHT / deepwater Premium remelted alloy or nickel-based grades Supports higher integrity requirements and severe service margins
Client-drawing custom forgings Specified by drawing and project code Ensures compliance with unique geometry, machining and certification scope

Advanced Manufacturing Process for Superior BOP Body Performance

Our full in-house manufacturing chain ensures full quality control from steel melting to final machining, eliminating supply chain risks and ensuring consistent product quality for every BOP body we deliver.

Custom Forged BOP Body Open Die Forging Production Process at Jiangsu Liangyi factory
Open die forging and controlled manufacturing workflow used for custom BOP body production.

Premium Steel Melting Technology

The performance of a BOP body starts with steel purity. All of our blowout preventer body steels are manufactured using advanced melting processes to ensure superior material integrity:

  • Primary melting:The electric furnace process of full vacuum degassing (EFVD) is adopted to reduce gas content and non-metallic inclusions
  • High-quality melting options:Vacuum induction melting (VIM), vacuum arc remelting (VAR), electroslag remelting (ESR), for ultra-high demand uses
  • Conduct a comprehensive chemical composition analysis of each heat source to ensure compliance with material standards and project requirements

Precision Open Die Forging Process

Our 2000T to 6300T hydraulic forging presses deliver a minimum 3:1 forging ratio for all BOP bodies, which:

  • Refines the steel grain structure, improve the mechanical strength and fatigue resistance
  • Eliminates internal voids and porosity to make sure 100% structural integrity under extreme pressure
  • Optimizes material flow lines to match the load direction of the BOP body to enhance the impact resistance
  • Supports single-piece BOP body forging up to 30 tons which meet the requirements of ultra-large deepwater BOP systems

Controlled Heat Treatment

We carry out full in-house quenching and tempering heat treatment for every BOP body, with precise temperature control to:

  • Get the optimal balance of hardness, tensile strength, yield strength and impact toughness
  • Ensure consistent mechanical properties throughout the entire forging, eliminating internal stress
  • Meet the requirements of API Spec 16A and NACE MR0175 standards for sour service uses

BOP Body Manufacturing Workflow from Raw Steel to Final Delivery

For high-integrity well control forgings, the manufacturing route is as important as the material grade itself. The typical workflow below helps buyers understand where process control directly affects final quality.

1. Steelmaking

Primary melting and optional premium remelting routes are selected according to project severity and material quality targets.

2. Reduce Forging

The body formed by open die forging improves the tissue density, grain refinement and internal integrity.

3. Heat Treatment

Control quenching and tempering to balance hardness, strength and toughness.

4. Ultrasonic Verification

Internal integrity is checked before final machining to reduce hidden defect risk.

5. Precision Mechanical Processing

The main interfaces, sealing areas and size tolerances shall be processed in accordance with the requirements of the drawings.

6. Final Inspection & Release

Non-destructive testing, document review and customer/third-party witness points are completed before shipment.

Global Oil & Gas Project Cases (GEO Targeted)

We have provided forged steel blowout preventer mechanisms to oil and gas operators and EPC companies in over 50 countries, working well in the world's most challenging oil and gas basins. Our representative regional project cases include:

North America: Gulf of Mexico Deepwater Drilling Project (USA)

We customized and mass-produced 21-1/4" 15000 PSI triple ram BOP forged bodies for a super major oil company's deepwater drilling platforms in the Gulf of Mexico, United States.The product is made of AISI 4340 alloy steel and adopts the EFVD+ESR double melting process, meeting the API Spec 16A PSL4 specification grade and the U temperature grade requirements under ultra-deep water, high temperature and high pressure conditions. All blowout preventers have passed strict third-party testing, comply with ASTM A388/388M standards, and operate stably in drilling operations at a water depth of more than 2000 meters, providing reliable well control performance for more than 5 years.

Middle East: Development of Onshore Acidic Gas Fields (Saudi Arabia & UAE)

We provided over 200 sets of 13-5/8" 10,000 psi double gate blowout preventer forgings for an acid gas field development project of a national oil company in Saudi Arabia, and additional supplies to the United Arab Emirates and Qatar. This product is made of AISI 4130 alloy steel and is accordance with NACE MR0175 standard. It is suitable for acidic working environments with high hydrogen sulfide content and has good resistance to sulfide stress cracking (SSC). Each blowout preventer body has undergone 100% VT, UT, MT and PT non-destructive testing, fully meeting the customer's strict quality management requirements. This product has been widely applied in the onshore drilling operations of customers, and no quality issues have occurred during the three-year service.

Europe: North Sea Offshore Oilfield Project (Norway & UK)

We provided 7-1/16"5000psi single gate blowout preventer forging mechanisms for the North Sea acidic gas field project, serving departments in Norway and the UK, manufactured to customer-specified requirements including NORSOK-related documentation. The product is made of A182F6NM martensitic stainless steel, it has good low-temperature impact toughness at -46°C and is well used in the harsh low-temperature marine environment in the North Sea. All products have passed EN 10204 3.1 certification and third-party inspection, and have been successfully applied in the platform workover operations of customers, meeting the strict environmental protection and safety requirements of the European oil and gas industry.

Asia Pacific Region: Onshore oilfield workover operations in Southeast Asia

We customized an 11-inch 3000psi annular blowout preventer forging body for a leading oilfield company in Southeast Asia. It was manufactured strictly in accordance with the customer's customized drawings, and our business scope covers Indonesia, Malaysia, Thailand and Australia. This product is made of AISI 4140 alloy steel, according to API Spec 16A PSL2 standards. It has great structural stability and fatigue resistance and is suitable for frequent well servicing operations. With our complete in-house manufacturing capabilities, our delivery time is 25% faster than that of our customers' original suppliers, and we have established long-term repeat supply partnerships with our customers to provide services for their onshore oilfield operations in the region.

South America: Brazil Pre-Salt Deepwater Oilfield Project

We supplied large-size 20-3/4" 10000 PSI double ram BOP forged bodies for a Brazilian national oil company's pre-salt deepwater oilfield development project in Brazil, with additional supplies to other South American countries including Argentina and Colombia. Made from AISI 4330V mod alloy steel with good ESR melting process, the products meet the strict requirements of high pressure, high corrosion and alternating load conditions in pre-salt formations. All BOP bodies passed full non-destructive testing and met the project's ANP-related documentation requirements, and have been used in the client's deepwater drilling operations in the Santos Basin.

West Africa:The Nigeria Offshore Oilfield Development Project

We supplied some BOP body forgings for a big offshore oilfield development project in Nigeria, West Africa. These included single ram, double ram, and annular BOP ram bodies. We also sent more to Angola and other West African countries. All of the products met the requirements of API Spec 16A and NACE MR0175. There was a full set of traceable materials from the melting of the steel to the delivery. We also helped the client with providing technical support on-site to make sure that the installation and commissioning went smoothly. We are now a long-term supplier of the client.

Global Service Regions & Regional Support

As a global leading manufacturer of forged steel blowout preventers, we provide technical supports for oil and gas projects worldwide. Our products have been successfully used in the following key regions:

United States
Canada
Mexico
Brazil
Saudi Arabia
UAE
Qatar
Kuwait
Norway
United Kingdom
Netherlands
Australia
Indonesia
Malaysia
Nigeria
Angola

Our sales and engineering team works on UTC+8 (China Standard Time), and we have English-speaking support available for all questions from around the world. We can offer tailored solutions for specific regional needs, such as local compliance standards, paperwork, and logistics help.

Strict Quality Control & Non-Destructive Examination (NDE)

We know that the BOP body is the last thing that keeps well control safe. So, we use a zero-defect quality control system on every BOP body we make, and we follow all international inspection standards.

Forged Steel BOP Body 100% NDE Ultrasonic Testing Inspection at Jiangsu Liangyi quality control lab
Non-destructive examination and quality verification for forged steel BOP body integrity assurance.

Inspection & Testing Accordance Standards

  • API Specification 16A (Latest Edition): Specification for Wellhead and Christmas Tree Equipment
  • NACE MR0175/ISO 15156-1 (Latest Edition): Materials for use in H2S containing Environments
  • ASTM A-370: Test Methods for Mechanical Testing of Steel Products
  • ASTM A-388/388M: Ultrasonic Examination of Heavy Steel Forgings
  • ASME 564/564M: Age-Hardening Stainless Steel Bars and Shapes
  • ASTM E165/E280: Liquid Penetrant and Magnetic Particle Testing Standards

Mandatory 100% Non-Destructive Examination (NDE)

All finished forging steel BOP bodies undergo the following non-destructive testing, with full reports included in the delivery document package:

Visual Inspection (VT)

  • 100% full surface coverage inspection of all accessible surfaces of the blowout preventer valve body
  • Zero tolerance for visible lap joints, cold closures, cracks, pores, slag, scale and other surface defects
  • Complete inspection results are recorded and archived for full traceability

Ultrasonic Testing (UT)

  • Necessary full-volume UT inspection for all BOP bodies after heat treatment, prior to machining
  • Performed in strict accordance with ASTM A388/388M standards
  • Acceptance criteria: No single indications exceeding the reference distance amplitude curve; No multiple indications exceeding 50% of the reference curve within 13mm of each other

Supplementary NDE Testing

  • Magnetic Particle Testing (MT) for surface and near-surface defects in ferromagnetic materials
  • Liquid Penetrant Testing (PT) for surface defects in non-ferromagnetic materials
  • Full mechanical property testing, including tensile strength, yield strength, elongation, impact toughness and hardness testing
  • Microstructure and metallographic analysis to ensure grain structure accordance

Main Documents and Traceability Package

For international EPC, OEM and end-user approval, forged BOP bodies usually need more than just size acceptance.The document quality often determines whether the shipment can be approved without delay.

Material Records

Chemical composition reports, heat numbers, raw material identification and mill certificates support base-material traceability.

Heat Treatment Records

Furnace diagrams and processing records are helpful for verifying the process routes used to get the required mechanical properties.

NDE Reports

UT, MT, PT, VT and any project-specific inspection reports document actual examination scope and results.

Mechanical Test Results

Tensile, impact, hardness and other required test results can be compiled into the final quality records.

If your project has a dedicated ITP, QCP or end-user vendor data requirement, those files should be shared before production starts so the manufacturing route and witness points can be aligned early.

Custom Forged BOP Body Solutions for Global Clients

We provide one-stop custom forging services for forging steel blowout preventer BOP bodies, covering steel melting, open die forging, heat treatment, precision machining and full inspection, all manufactured strictly according to client's drawings and technical manuals.

With our 80,000 square meter modern factory, 40 million USD in fixed assets, 120,000 tons of annual forging capacity, and cutting-edge production and inspection equipment, we can make high-quality BOP body forgings that weigh up to 30 tons each and meet the highest standards of the global oil and gas industry. We can make small batches of samples and large amounts of goods, and we can deliver them when you need them to meet project deadlines.

Custom manufacturing can include: rough-forged bodies with machining allowance, near-net forged shapes, heat-treated forgings, finished machined housings, third-party witnessed inspection, and export-ready documentation packages tailored to OEM, EPC or end-user approval workflows.

Why Buyers Use Jiangsu Liangyi for Custom BOP Body Forgings

27+ yearsOpen die forging experience for industrial uses
80,000 ㎡Modern manufacturing footprint
120,000 tonsAnnual forging capacity
Up to 30 tonsSingle-piece forging capability for large bodies

Full Process Control

Steel melting, open die forging, heat treatment, machining and inspection can be coordinated through one manufacturing chain.

Document Preparation

MTCs, traceability documents, NDE reports and third-party inspection documents required for supporting international projects.

Custom Drawing Capability

Suitable for OEM and EPC requirements when the standard catalog sizes do not match the final equipment design.

Global Delivery Focus

Experienced in export-oriented communication, English-language technical support and region-specific project document.

RFQ Checklist: What to Send for a Faster BOP Body Quotation

To keep quotation cycles short and reduce technical back-and-forth, buyers should send as much of the following information as possible when requesting a forged BOP body price.

  • Product type: single ram, double ram, triple ram, annular or custom BOP body parts
  • Nominal bore size and working pressure
  • Material grade or approved alternative grades
  • Applicable standards, including API level, NACE requirement and PSL class
  • 2D drawing, 3D model or critical machining sizes
  • Heat treatment, impact test or hardness requirements
  • NDE scope: VT, UT, MT, PT, RT and acceptance criteria
  • Third-party inspection, certification and end-user document package requirements
  • Order quantity, required delivery date and destination port / country

Quotation tip: If you only have a basic concept drawing, it is still useful to provide the pressure class, bore, service medium, end-use location and target delivery date. That is usually enough to start technical discussion.

Frequently Asked Questions (FAQ)

What standard do BOP bodies need to meet?

Blowout Preventer (BOP) bodies for oil and gas uses must meet API Spec 16A (latest edition) for wellhead and Christmas tree equipment. For sour service H2S environments, they must also meet NACE MR0175/ISO 15156-1 standards. Our BOP bodies are manufactured in accordance with these international standards, with optional PSL1-PSL4 specification levels to meet all project requirements.

What is the best material for a forged BOP body?

The optimal material for a BOP body depends on the working conditions: AISI 4130/4140 alloy steel for standard onshore drilling; AISI 4340/4330V mod for high-pressure deepwater applications; A182 F51/F53 duplex stainless steel for sour service H2S environments; and F6NM for low-temperature offshore operations. We offer all these material grades with full mill test certification for each batch.

Can you manufacture custom BOP bodies per our drawings?

Yes, we can produce forging BOP bodies according to clients' drawings and technical manuals

What non-destructive testing is carried out on the main body of the blowout preventer?

All of our finished blowout preventers undergo 100% non-destructive testing (NDE), including visual inspection (VT) for surface coverage, ASTM A388/388M ultrasonic testing (UT) for internal integrity, magnetic particle testing (MT), liquid penetrant testing (PT), and optional radiographic testing (RT) upon request. All NDE reports are included in the delivery document package for each BOP body.

What is the lead time for custom BOP bodies?

Normally, the lead time for a sample order is 4-6 weeks and 8-12 weeks for mass production orders. We can also accept rush orders if required.

Why choose forged blowout preventer bodies instead of cast ones?

In critical well control services, forged blowout preventers are the preferred choice because forging can improve the internal structure, refine the grain structure and enhance reliability under cyclic pressure loads.

Can you provide blowout preventer valve bodies with machining allowances or full machining conditions?

Yes.We can provide blowout preventers in forged heat treatment state, semi-processed state or finished processed state according to the approved drawings and inspection requirements.

What documents are usually provided when forging the body of a blowout preventer?

We provide main documents including heat treatment records, chemical composition reports, mechanical test reports, size inspection results, non-destructive inspection reports, traceability records and third-party inspection certificates, depending on the order requirements.

Can forged BOP bodies be supplied for both OEM manufacturing and end-user replacement needs?

Yes. Depending on the drawing package and approval workflow, forged BOP bodies can be supplied for OEM equipment manufacturing, aftermarket replacement, maintenance projects and selected workover or drilling system upgrades.

How can buyers shorten lead time for custom BOP body orders?

The fastest way is to provide the drawing, bore, pressure class, material grade, NDE scope, documentation list and shipment destination at the RFQ stage. Early alignment on those items reduces revision cycles and speeds production planning.

Contact Us for Custom BOP Body Quotation

Jiangsu Liangyi is committed to providing superior quality forging steel blowout preventer BOP bodies and competitive prices for global oil and gas clients. With 27+ years of forging experience and full API & ISO certification, we are your reliable long-term partner for all BOP forging requirements. Welcome to send your custom drawing, material requirements, and order quantity to get a detailed quotation within 24 hours!

Inquiry Email: sales@jnmtforgedparts.com

Phone/WhatsApp: +86-13585067993 (UTC+8 Time Zone)

Website: https://www.jnmtforgedparts.com

Address: Chengchang Industry Park, Jiangyin City, Jiangsu Province, China