18CrNiMo7-6 (1.6587) Forged Parts | ISO 9001:2015 Certified Manufacturer & Supplier in China

Jiangsu Liangyi Co., Limited is a leading ISO 9001:2015 certified China manufacturer of 18CrNiMo7-6 (1.6587) open die forgings, seamless rolled rings, gear shafts and custom forged parts, established in 1997 with 25+ years of continuous forging experience. We control the full production chain — from raw steel melting and vacuum degassing through forging, heat treatment, NDT inspection and precision rough machining — under a single ISO 9001:2015 certified roof in Jiangyin, Jiangsu Province, China. Every 18CrNiMo7-6 forged part we ship carries an EN 10204 3.1 Mill Test Certificate (or EN 10204 3.2 with third-party countersignature on request) traceable to the specific heat of steel used, giving our global clients the metallurgical traceability their projects demand.

What separates 18CrNiMo7-6 (1.6587) from most other case hardening steels is its engineered balance of three premium alloying elements — chromium, nickel, and molybdenum — working together to solve the fundamental challenge of large-section hardenability. When a gear shaft exceeds 150mm in pitch circle diameter, conventional steels like 20CrMnTi or 16MnCr5 cannot consistently achieve adequate core hardness after carburizing and quenching. 18CrNiMo7-6 was specifically developed for precisely this problem, maintaining core hardness of 30–45 HRC at section diameters up to 500mm and beyond, without sacrificing the impact toughness that prevents catastrophic brittle fracture under shock loading. Our 18CrNiMo7-6 forged products are exported to more than 50 countries, serving wind energy, mining, oil & gas, cement, transportation, and defense industries worldwide.

Full Range of 18CrNiMo7-6 (1.6587) Forged Products & Size Capability

We produce a complete line of 18CrNiMo7-6 (1.6587) forged steel products to custom dimensions and shapes. All products are manufactured strictly according to client-supplied drawings or internationally recognized standards, with no minimum order quantity restrictions for engineering development projects.

Material Science: Why the Cr-Ni-Mo Combination Works — The Metallurgical Logic Behind 18CrNiMo7-6

Most discussions of 18CrNiMo7-6 stop at listing chemical composition numbers. Understanding why this specific alloy chemistry was engineered — and what each element actually does inside the steel at a microstructural level — is what allows engineers to make correct material selection decisions and specify appropriate heat treatment parameters. Here is an original technical explanation based on 25+ years of production experience at Jiangsu Liangyi.

The Role of Each Alloying Element

Carbon (C): 0.15–0.21%

The core carbon content is deliberately kept low — lower than medium-carbon alloy steels — because 18CrNiMo7-6 is a case hardening steel. The final hardness at the gear tooth surface comes from carburizing, which enriches the surface layer to 0.75–0.85% carbon before quenching. The base steel's low core carbon ensures that after quenching, the core transforms to tough lower-bainite or lath martensite (hardness 30–45 HRC) rather than brittle high-carbon martensite. This deliberate carbon gradient from case (high C, high hardness) to core (low C, tough) is the fundamental mechanism that makes case hardening steels superior to through-hardening steels for gear applications.

Chromium (Cr): 1.50–1.80%

Chromium serves two critical functions simultaneously. First, it increases hardenability by shifting the continuous cooling transformation (CCT) curve to the right — meaning the steel can be fully hardened at slower cooling rates (oil quench rather than water quench), which dramatically reduces quench cracking risk in large, complex shapes. Second, chromium forms carbides during carburizing that improve surface wear resistance. The 1.5–1.8% chromium range in 18CrNiMo7-6 is carefully balanced: high enough to provide meaningful hardenability, but below the level where excessive carbide network formation would reduce toughness.

Nickel (Ni): 1.40–1.70%

Nickel is the most critical element for core toughness and is the primary reason 18CrNiMo7-6 outperforms chromium-only or chromium-manganese steels at large cross-sections. Nickel does not form carbides; instead it goes into solid solution in the iron matrix, lowering the ductile-to-brittle transition temperature (DBTT) and improving impact energy at both ambient and sub-zero temperatures. For wind turbine applications in northern European or Canadian climates where operating temperatures reach −30°C to −40°C, the nickel content in 18CrNiMo7-6 is not optional — it is essential. The 1.4–1.7% nickel range also synergizes with chromium and molybdenum to produce a very fine lath martensite core structure after quenching, which is inherently tougher than coarser martensite morphologies.

Molybdenum (Mo): 0.25–0.35%

Molybdenum addresses a specific failure mode called tempered martensite embrittlement (also called reversible temper embrittlement or 500°F embrittlement). In chromium-nickel steels without molybdenum, impurity elements (primarily phosphorus, antimony, tin, arsenic) segregate to prior austenite grain boundaries during slow cooling through 375–575°C, causing catastrophic intergranular fracture at impact. Molybdenum effectively suppresses this embrittlement mechanism, which is why 18CrNiMo7-6 keeps reliable impact toughness even after service at elevated temperatures or slow cooling rates. Molybdenum also contributes additional hardenability and refines the carbide distribution during carburizing.

Aluminum (Al): 0.01–0.03%

Aluminum is added primarily as a grain refiner and deoxidizer. During austenitization, aluminum nitrides (AlN) pin the austenite grain boundaries, preventing grain coarsening during the prolonged high-temperature carburizing cycle (typically 15–40 hours at 900–940°C). Without aluminum, austenite grain growth during carburizing would produce a coarse-grained structure with dramatically reduced toughness. The narrow 0.01–0.03% aluminum range in EN 10084 is critical: too little and grain pinning is insufficient; too much and alumina inclusions accumulate, reducing fatigue resistance and machinability. This range is tighter than most other steel grades, reflecting the precision required for heavy-duty carburized components.

The Vacuum Degassing Requirement

Vacuum degassing is not an option with 18CrNiMo7-6, it is a must, in accordance with EN 10084. This is because dissolved hydrogen causes delayed fracture (hydrogen-induced cold cracking) in high-strength steels, and dissolved oxygen forms alumina and silica inclusions which act as fatigue crack initiation sites. The EN 10084 limits of ≤25ppm oxygen and ≤2ppm hydrogen can only be consistently achieved through vacuum degassing. At Jiangsu Liangyi, we operate a dedicated vacuum degassing furnace (VD/VOD type) for all 18CrNiMo7-6 heats, and hydrogen content is verified by hot extraction analysis on every heat before forging approval.

18CrNiMo7-6 (1.6587) Chemical Composition, Mechanical Properties & Heat Treatment Data

Melting Process Requirements (EN 10084)

• Melting process: Electric arc furnace (EAF) or basic oxygen furnace (BOF), with mandatory secondary ladle refining (LF/VD or similar)
• Vacuum degassing: Required for all heats — not optional. Hydrogen ≤ 2ppm (0.0002%), Oxygen ≤ 25ppm (0.0025%)
• Calcium addition for sulfide shape control is prohibited before vacuum degassing; maximum 15ppm calcium (0.0015%) permitted post-VD. Calcium wire injection after VD is commonly used at our mill to achieve globular (MnS) sulfide morphology, which reduces anisotropy in mechanical properties of the final forging
• Quality class: Minimum MQ (Medium Quality) per ISO 6336-5 / DIN 3990-5. For wind energy and subsea oil & gas applications, ME (High Quality) is specified — this requires tighter inclusion cleanliness and mandatory charpy testing at −20°C or lower
• Non-radioactive scrap sources only; all incoming scrap verified by portable XRF analyzer and OES spectrometry at our facility

Chemical Composition (EN 10084)

Carbon Equivalent (CE) — Weldability Assessment

The carbon equivalent quantifies 18CrNiMo7-6's susceptibility to hydrogen-induced cold cracking (HICC) during any welding operations. Using the International Institute of Welding (IIW) formula:

Mechanical Properties (EN 10084 — Quenched & Tempered Core Properties, 30mm Round Specimen)

Heat Treatment Specifications (EN 10084)

Hardenability Data (Jominy End-Quench Test, EN 10084)

The exceptionally flat Jominy hardenability curve — maintaining 29–41 HRC even at 40mm from the quenched end — is the defining advantage of 18CrNiMo7-6 over lower-alloy case hardening steels. This shallow gradient means that even the core of a 600mm diameter forging will achieve meaningful hardness after oil quenching, providing the core fatigue and yield strength that heavy-duty gears require.

Carburizing Depth Engineering Guide for 18CrNiMo7-6 (1.6587) — By Application

Effective case depth (CHD) is defined as the perpendicular distance from the surface to the location where hardness equals 550 HV (approximately 52 HRC), per ISO 2639. Selecting the correct CHD for each application is as critical as material selection — insufficient case depth leads to case crushing and subsurface fatigue crack initiation, while excessive case depth increases brittleness risk and manufacturing cost.

The following guide is based on Jiangsu Liangyi's engineering experience supplying 18CrNiMo7-6 carburizing blanks to gear manufacturers across 25+ years. These recommendations should be verified against the applicable gear standard (ISO 6336-5 or AGMA 2101-D04) for each specific application.

Carburizing Atmosphere & Process Cycle Details

For 18CrNiMo7-6 components, gas carburizing in endothermic (endo) atmosphere with boost-diffuse cycle is the standard process at partnered heat treatment facilities we work with. Key process parameters:

• Carburizing temperature: 900–940°C (higher temperature increases carbon diffusion rate but promotes grain growth; aluminum nitrides in 18CrNiMo7-6 resist grain growth to approximately 930°C)
• Boost phase carbon potential: 1.05–1.15% (carbon potential controlled by CO₂ IR analyzers or oxygen probes; target surface carbon accumulation)
• Diffuse phase carbon potential: 0.80–0.90% (reduces carbon gradient, promotes more uniform case hardness through depth)
• Quench delay after furnace exit: Maximum 30 seconds for oil quench. Longer delay allows temperature drop and soft spots at the part surface
• Retained austenite control: After quenching, retained austenite typically 20–35% at surface. For critical high-cycle applications (wind turbine gears), sub-zero treatment at −60°C to −80°C for 2 hours followed by low-temperature tempering (160–180°C) reduces retained austenite to below 15%, improving dimensional stability and fatigue life
• Shot peening: Recommended for all case-hardened 18CrNiMo7-6 gears. Shot peening introduces compressive residual stress at the surface (typically −600MPa to −900MPa), significantly improving bending fatigue life by 20–40% compared to unpeened condition

Common Failure Modes in Heavy Industrial Gears & How 18CrNiMo7-6 Addresses Each

Understanding real-world gear failure mechanisms — and how material and process selection directly mitigates each one — is the foundation of engineering-led procurement. The following analysis is drawn from failure investigation experience at Jiangsu Liangyi, serving clients who previously experienced gear failures with suboptimal materials.

18CrNiMo7-6 vs. Alternative Case Hardening Steels — Detailed Technical Comparison

Choosing the right case hardening steel grade is an engineering decision, not simply a cost decision. The following comparison evaluates 18CrNiMo7-6 (1.6587) against its four closest alternatives across twelve performance parameters relevant to heavy industrial applications:

Engineering Selection Guide: When to Specify 18CrNiMo7-6 (1.6587)

Based on 25+ years of supplying 18CrNiMo7-6 forgings to engineers globally, Jiangsu Liangyi recommends specifying this grade when any two or more of the following conditions apply to your application:

When 18CrNiMo7-6 Is NOT the Optimal Choice

• Small section, high-volume components (Ø <50mm): 16MnCr5 or 20MnCr5 achieves equivalent surface properties at 35–50% of the material cost
• H2S / sour service (without modified specification): High core hardness after Q&T may exceed NACE MR0175 limits; consult a materials engineer for alternatives or modified processing
• Through-hardened (not carburized) applications: If no carburizing is planned, medium-carbon alloy steels (42CrMo4, 34CrNiMo6) may offer better cost-performance for the same strength level
• Stainless or corrosion-resistant requirement: 18CrNiMo7-6 has no meaningful corrosion resistance in aggressive aqueous environments. Use duplex stainless steel or nickel alloys where corrosion is the primary concern

GEO-Targeted Industrial Application Cases — 18CrNiMo7-6 Forgings in the Field

18CrNiMo7-6 (1.6587) has proven itself across the most demanding industrial environments globally. The following application cases are drawn from Jiangsu Liangyi's project delivery history, reflecting real engineering challenges solved with this material. All specific client details have been generalized to protect commercial confidentiality.

Wind Power Industry — EU Core Market (Germany, Denmark, Spain, France)

Since 2010, Jiangsu Liangyi has supplied EN 10084 18CrNiMo7-6 forged gear shaft blanks, planetary carrier rings and main ring gear blanks for both onshore and offshore wind turbine gearboxes in the 2–15 MW class, serving European gearbox manufacturers and their Tier-2 supply chains. The critical engineering challenges for wind turbine gearbox shafts are simultaneous compliance with: ISO 6336-5 MQ or ME quality class, EN 10228-3 UT Quality Class 4 (or higher), Charpy testing at −20°C with KV ≥ 27J transverse (typical for offshore applications), and strict grain size requirements (ASTM 6 or finer / EN-ISO 643 G6 or finer). Our vacuum-degassed 18CrNiMo7-6 forgings with verified hydrogen ≤1.5ppm and oxygen ≤15ppm are designed to meet all these requirements consistently. Typical turbine gearbox design service life: 25 years under full cyclic load spectrum.

Mining Industry — Australia, Canada, Chile, Brazil, South Africa

Heavy mining equipment demands forgings that survive where lower-alloy materials fail. For gyratory and cone crusher applications, 18CrNiMo7-6 eccentric shafts, spindles and slewing rings are routinely specified over through-hardened 42CrMo4 alternatives, primarily due to the superior case hardening potential and core toughness at large cross-sections. The published literature and practical field experience from mining equipment OEMs indicates that case-hardened 18CrNiMo7-6 components consistently outperform through-hardened medium-carbon steels in terms of contact fatigue life and resistance to impact fracture under crusher jam conditions. For large ore processing ring gear applications, we produce seamless rolled rings up to OD Ø6,000mm in 18CrNiMo7-6 with normalized supply condition, achieving ASTM grain size 6–7 throughout the section with forging ratio ≥5:1 verified by macroetch cross-sections.

Oil & Gas Equipment — North America, Middle East, North Sea

For oil & gas mud pump and drilling equipment applications, we manufacture 18CrNiMo7-6 gear and pinion shaft blanks to customer-provided drawings for supply to OEM manufacturers and their machining subcontractors. Typical documentation requirements for this sector include EN 10084 chemistry compliance, mechanical properties tested longitudinally and transversely at mid-radius and core positions, 100% UT per EN 10228-3 Class 3 or 4, and Charpy testing at 0°C or lower. EN 10204 3.2 certificates with accredited third-party countersignature are available on request. Where specific project documentation formats are required (NORSOK, DNV, classification society formats), we support these per the client's QC plan — please discuss requirements at the enquiry stage. Note: we do not hold an API 6A organizational license; clients requiring API monogram products should discuss alternatives with our technical team.

Cement & Heavy Process Industry — Southeast Asia, Africa, Eastern Europe

Cement plant gear trains operate under some of the harshest thermal and mechanical conditions in industry — continuous 24/7 operation, elevated operating temperature, heavy cyclic torque from kiln and mill starting loads. For cement kiln main gear pinion shaft applications, we supply 18CrNiMo7-6 pinion shaft forgings with normalized-and-rough-machined supply condition, achieving forging ratios of 6:1 or higher from vacuum-degassed ingot for improved cleanliness, with grain size verified at ASTM 7 minimum. Industry experience reported by cement plant operators indicates substantially longer lifetime with case-hardened 18CrNiMo7-6 pinions versus through-hardened 42CrMo4 alternatives, particularly under heavy start-stop cycling conditions typical of kiln operations.

Transportation, Marine & Engineering Machinery — Global

Locomotive transmission gearboxes, marine reduction gearboxes, heavy press crankshafts and construction machinery parts all take full advantage of 18CrNiMo7-6’s excellent large-section hardenability and core toughness.We supply forged ring blanks and shaft blanks for transmission and propulsion gearboxes with upgraded purity requirements: total oxygen ≤15ppm, hydrogen ≤1.5ppm, ME quality grade in line with ISO 6336-5.Large cross-section output shafts are inspected by UT to EN 10228-3 Class 4 or 5.When classification society rules apply (DNV, BV, LR and other equivalent bodies), our mill test documentation is compiled to support customers’ class approval application.

Forging Dimensional Tolerances & Machining Allowances

Understanding the dimensional tolerance and machining allowance system for 18CrNiMo7-6 forgings is essential for correctly specifying the forging drawing versus the final finished drawing. Over-specifying machining allowances wastes expensive material and machining time; under-specifying risks insufficient stock for surface defect removal or achieving final tolerances.

Full-Process Quality Control & NDT Acceptance Criteria

Quality control for 18CrNiMo7-6 (1.6587) forged parts at Jiangsu Liangyi is not a single end-of-line inspection — it is a layered, full-process verification system with mandatory hold points at each production stage. No step is skipped or waived under commercial pressure. Below is the complete quality gate structure:

Stage 1: Incoming Raw Material Inspection

• Chemical composition verification: Optical Emission Spectrometry (OES) on a sample from every incoming billet or ingot heat. All 12 elements in EN 10084 Table 2 (including trace elements Ca, O, H) verified against specification limits
• Hydrogen content analysis: Hot extraction method (LECO RH-402 or equivalent) on cast product samples. Heats with hydrogen >1.8ppm are quarantined pending hydrogen diffusion anneal before forging
• Ingot / billet dimensional verification and macroetch cross-section review for major piping, segregation or inclusion bands
• Supplier certificate review: Mill Test Certificate from the steelmaking plant cross-checked against our incoming test results. Discrepancies >5% on any element trigger NCR (Non-Conformance Report) and supplier audit

Stage 2: Forging Process Control

• Forge heating temperature monitoring: Contact thermocouples on furnace load + visual pyrometer verification at press. Forging start temperature ≥1050°C for 18CrNiMo7-6; forging stop temperature ≥850°C (below 850°C, forging halted and billet reheated)
• Forging ratio verification: Calculated from original billet cross-section to forged cross-section. Minimum 5:1 for CC/rolled bar stock, minimum 3:1 for ingot stock — documented in route card, not just claimed
• Ring rolling pass schedule: Recorded automatically by CNC ring rolling machine (diameter, height, wall thickness, rolling force at each pass). Data archived per heat and order number for traceability
• Post-forge visual inspection: All forgings inspected for laps, folds, cold shuts, and excessive scale pits immediately after forging. Any suspect areas marked, photographed, and dispositioned by quality engineer before heat treatment

Stage 3: Heat Treatment Control

• Furnace calibration: All heat treatment furnaces are subject to periodic Temperature Uniformity Surveys (TUS) using calibrated thermocouples traceable to national standards of measurement. Calibration records are kept and made available to customers on request.
• Load temperature monitoring: Multiple thermocouples placed on representative load positions (top, middle, bottom); minimum soak time only begins after all thermocouples reach setpoint temperature ±10°C
• Quench monitoring: Oil quench tank temperature recorded before and after quench. Quench medium agitation verified. 18CrNiMo7-6 oil quench at 60–80°C is standard; deviation requires engineering disposition
• Post-heat treatment hardness check: Brinell hardness measured at minimum 3 locations per forging (ends + middle). Results recorded on traveler card. Out-of-specification hardness triggers re-heat treatment or rejection

Stage 4: Non-Destructive Testing (NDT)

Stage 5: Final Documentation & Certification

• EN 10204 3.1 Mill Test Certificate (MTC): Signed by Jiangsu Liangyi's own Quality Manager (independent from production). Includes: heat number, chemical composition (ladle and product analysis), mechanical test results (with specimen location and orientation), hardness results, UT/MT acceptance statement, heat treatment record, applicable standard compliance statement
• EN 10204 3.2 MTC (on request): Countersigned by accredited third-party inspection body (Bureau Veritas, SGS, TÜV, Lloyd's Register, Intertek — client's preferred TPI body can be specified). Available for offshore, nuclear, and critical industrial projects at additional cost and lead time
• CE Declaration of Conformity (on request, project-specific): Where the forging is incorporated into CE-marked machinery, we can support the responsible person's conformity assessment by providing dimensional and material test data in the required format. CE DoC for the finished machinery is the OEM's legal responsibility, not the forging supplier's. Please discuss specific requirements with our team before ordering.
• API-format Documentation (on request): We do not currently hold an API 6A organizational license. Where clients require API-format traceability documentation, we can discuss what can be provided per your specific project QC plan requirements.

Supply Chain Transparency & Raw Material Traceability

In 2024, raw material fraud in industrial steel supply chains resulted in several high-profile failures in European wind energy and mining projects. Jiangsu Liangyi believes that transparency — not just certification paperwork — is the correct response. Below is our complete traceability chain for 18CrNiMo7-6 forgings:

Welding Considerations for 18CrNiMo7-6 (1.6587) Forged Parts

This section provides original technical guidance for engineers and fabricators who need to weld 18CrNiMo7-6 components, either during fabrication or for repair. The key message is clear: welding 18CrNiMo7-6 requires significantly more care than welding low-alloy structural steels, and should not be attempted without a qualified procedure and experienced personnel.

Why 18CrNiMo7-6 Is Challenging to Weld

With a carbon equivalent (CE-IIW) of approximately 0.62–0.72, 18CrNiMo7-6 is highly susceptible to hydrogen-induced cold cracking (HICC), also called hydrogen cracking or delayed cracking. This type of cracking occurs in the heat-affected zone (HAZ) — not immediately during welding, but typically 24–72 hours after completion, when dissolved hydrogen has diffused and concentrated at triaxial stress sites. The high CE means the HAZ transforms to untempered martensite upon cooling, which is hard, brittle, and highly sensitive to hydrogen. HICC failures in forged shafts and gear blanks can be completely internal with no surface indication, making them particularly dangerous.

Welding Procedure Requirements (Where Welding Is Required)

• Preheat and interpass temperature: Minimum 200°C preheat before striking arc; maintain 200–300°C interpass throughout entire weld. Measure with contact thermocouple at 75mm from joint centerline. Letting any zone cool below 150°C before weld completion is unacceptable
• Filler material: Use matching composition or under-matching low-hydrogen consumables. Hydrogen content of filler must be verified: H5 class (≤5ml/100g) minimum for shielded metal arc welding (SMAW); MIG/TIG with inert gas are preferred. Electrodes must be stored in heated electrode oven at 150°C and only removed immediately before use
• Post-weld hydrogen bake-out: Immediately upon weld completion (while still at interpass temperature), apply hydrogen bake-out: 300–350°C for minimum 2 hours. Do not allow cooling below 200°C between weld completion and bake-out start
• Post-Weld Heat Treatment (PWHT): After cool-down from bake-out, PWHT at 550–620°C for minimum 1 hour per 25mm of wall thickness. This tempers the HAZ martensite and further reduces trapped hydrogen. Temperature ramp-up and cool-down rates: ≤ 100°C/hour
• Post-PWHT inspection: 100% UT of weld zone and HAZ after PWHT and after full cooling to ambient temperature. MT or PT of all weld surfaces. Delay minimum 48 hours after PWHT before final NDT to allow any residual hydrogen to diffuse to detectable levels or escape harmlessly

Our Certifications & Quality Standards (E-E-A-T)

All 18CrNiMo7-6 (1.6587) forged parts manufactured by Jiangsu Liangyi are produced under a fully documented and externally audited quality management system. The following reflects our current certification status and applicable quality standards:

Industries & Markets We Serve Globally

Jiangsu Liangyi has established long-term relationships with manufacturers and project buyers in the following industries across more than 50 countries. We do not publicly name individual clients without their permission — the following represents the market sectors we actively supply to:

References from existing clients can be provided on request and subject to the client's prior approval. Please contact us if you require supplier qualification documentation or reference contacts for your project.

Production Timeline — From RFQ to Delivery

Our standard production timeline for 18CrNiMo7-6 forgings reflects real-world constraints of vacuum-degassed steel procurement, forging furnace scheduling, heat treatment cycle times, and NDT throughput — not optimistic marketing promises:

• Day 0–3
  DFM Review & Technical Quotation — Engineers review drawings, confirm grade, heat treatment, tolerances, and applicable standards. Written quote with technical compliance matrix issued.
• Day 3–7
  Raw Material Procurement — Order placed with pre-qualified steel mill for 18CrNiMo7-6 vacuum-degassed billet / ingot. Incoming delivery and inspection: 3–5 days within Jiangsu region.
• Day 7–22
  Forging & Heat Treatment — Billet heated, forged to target shape with minimum required forging ratio, cooled. Heat treatment (annealing / normalizing / Q&T) in calibrated furnace. Total duration: 5–15 days depending on piece weight and heat treatment type.
• Day 22–30
  NDT Inspection — UT (100%), dimensional inspection, hardness verification, sampling for chemical, mechanical, inclusion, and grain size testing. Lab results: 5–7 days. Witness inspection by client's TPI can be scheduled in this window.
• Day 30–35
  Rough Machining (If Required) — CNC rough machining to semi-finish dimensions per forging drawing. Surface conditioning and identification marking. Final dimensions re-verified against drawing.
• Day 35–40
  Certification, Packaging & Export — MTC compiled and signed (3.2 countersignature by TPI within 3 days of inspection completion). Export packaging applied. Shipping booked from Jiangyin / Shanghai port.

We can also speed up production for urgent orders on a case by case basis. Talk to our team about your required delivery date and we will tell you what we can do, with full transparency on what can realistically be expedited.

Global Shipping & Logistics for 18CrNiMo7-6 Forged Parts

Export Ports & Shipping Routes

• EU (Hamburg, Rotterdam, Antwerp, Felixstowe): Sea freight FCL or LCL; transit time 25–35 days. Air freight via Shanghai PVG for urgent small parts (<500kg). Incoterms: FOB Shanghai, CFR, CIF, DAP — as agreed
• North America (Los Angeles, New York, Houston, Vancouver): Sea freight FCL/LCL; transit 18–28 days (West Coast), 28–38 days (East Coast). Air via PVG for urgent. CBSA commercial invoice with HS code 7326.19 (forged steel parts) or as applicable
• Australia (Sydney, Melbourne, Brisbane, Fremantle): Sea freight 18–28 days. AQIS biosecurity compliance: all wooden packaging IPPC heat-treated (HT mark), or use steel crates
• Middle East (Dubai Jebel Ali, Dammam, Jeddah, Kuwait, Muscat): Sea freight 15–22 days. Gulf customs: HS code declaration, certificate of origin (China Chamber of Commerce stamped), SABER system pre-registration for Saudi Arabia if required
• Southeast Asia (Singapore, Bangkok, Ho Chi Minh City, Kuala Lumpur): Sea freight 8–15 days. ASEAN trade compliance review provided on request

Export Documentation Package (Standard)

Every shipment of 18CrNiMo7-6 forged parts from Jiangsu Liangyi includes: commercial invoice, packing list with individual piece weights and dimensions, bill of lading (FCL) or sea waybill (LCL), EN 10204 3.1 Mill Test Certificate, certificate of origin (Form A or CO from China Chamber of Commerce), IPPC-compliant wooden packing certificate, and customs HS code advisory letter. EN 10204 3.2 with TPI countersignature, and project-specific documentation formats are available on request — please specify at order stage.

Packaging Standards for Corrosion Protection

• All machined surfaces coated with Tectyl 502-C rust preventive oil or equivalent
• VCI (Volatile Corrosion Inhibitor) poly film wrapping on individual pieces
• Desiccant silica gel bags inside sealed VCI bags for sea freight >20 days transit
• IPPC heat-treated wooden pallets or custom wooden crates for large pieces
• Steel strapping and corner protection on all crated shipments
• Barcode and heat number sticker on each piece, protected under clear tape inside VCI wrapping

Our Local Time Zone Support — Engineering Responsiveness Across Global Markets

For our global clients, access to a technical contact in a reasonably overlapping time window is not a luxury — it is a project necessity. Jiangsu Liangyi maintains dedicated sales and engineering contacts for each major market region, with response time targets of 4 hours for technical enquiries during overlapping business hours:

• EU (CET/CEST — Germany, France, Netherlands, Scandinavia): CST 15:00–23:00 covers 09:00–17:00 CET. Primary EU contact languages: English, German (third-party interpreter available)
• North America (EST / CST / PST): For EST: CST 21:00–05:00 (next day) covers 09:00–17:00 EST — our team checks email at 21:00 CST. For PST: CST 00:00–08:00 covers 09:00–17:00 PST. Same-day response on urgent enquiries via WhatsApp or WeChat
• Australia (AEST/AEDT): CST 07:00–15:00 covers 09:00–17:00 AEST. Best overlap for technical calls is CST morning 08:00–12:00
• Middle East (GST — UAE, Saudi Arabia, Qatar): CST 13:00–21:00 covers 09:00–17:00 GST. Strong overlap for video calls and technical reviews
• Southeast Asia (ICT / WIB / MYT): CST 10:00–18:00 covers 09:00–17:00 — the best natural overlap of all regions with China Standard Time

Why Choose Jiangsu Liangyi as Your Global 18CrNiMo7-6 Forging Partner

• 25+ Years of Continuous Industrial Forging Experience (Est. 1997): Jiangsu Liangyi is not a trading company, not a recently established export entity, and not a broker. We are a production manufacturer that has operated the same Jiangyin facility since 1997, producing large open die forgings and seamless rolled rings for global industrial clients. Our accumulated production data, metallurgical knowledge, and client relationships cannot be replicated by newer entrants to the market
• Integrated Production: Melting through Machining Under One Roof: We operate our own 30-ton electric arc furnace, VD/VOD vacuum degassing station, 2,000–6,300 ton hydraulic forging press lines, 5-meter CNC seamless ring rolling machine, controlled atmosphere heat treatment furnaces, full NDT laboratory, and CNC rough machining center. This single-facility integration eliminates material mix-up risk between production steps, reduces lead time, and gives us direct control over every quality parameter. Competitors who subcontract forging, heat treatment, or NDT externally lose this control
• Vacuum Degassing Capability — Not Subcontracted: Many Chinese forging factories outsource vacuum degassing to a steel mill and simply purchase "VD-treated" billets with limited traceability. At Jiangsu Liangyi, our VD station treats every heat before forging. We monitor and record the VD process log (vacuum level, degassing time, temperature, hydrogen evolution) for every heat, and this data is available to clients on request. This is the only way to guarantee hydrogen ≤2ppm and oxygen ≤25ppm in the final forging
• EN 10204 3.2 and Third-Party Witness — Welcome: We welcome source inspection by client-appointed inspectors. Major TPI organizations including Bureau Veritas, SGS, TÜV Rheinland, Lloyd's Register, DNV, and Intertek have conducted inspections at our facility. We do not restrict inspector access, do not pre-select test samples. Advance notice is required to coordinate scheduling with production timelines.
• 120,000 Ton Annual Capacity — Scalable Supply: We can supply from a single prototype forging of 30kg to annual frame agreements covering thousands of tons per year. Our ERP-based production planning system allows us to provide accurate delivery commitments and production status updates throughout the order lifecycle
• Technical Support — Not Just Sales: Every 18CrNiMo7-6 quotation from Jiangsu Liangyi includes a free DFM (Design for Manufacturability) review, material selection consultation, and applicable standard compliance matrix. Our technical team has deep working knowledge of EN 10084, ISO 6336, carburizing process specifications, and NDT acceptance criteria, and can engage with your engineering team at a technical level throughout the enquiry and production process

Frequently Asked Questions (FAQ) — 18CrNiMo7-6 (1.6587) Forgings

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Contact Us for Custom 18CrNiMo7-6 (1.6587) Forging Solutions

We welcome enquiries from engineers, procurement managers, and project buyers globally. Whether you have an approved drawing ready for quotation, are in the early material selection stage, or need technical consultation on an application, please reach out — our engineering team is available to assist at no charge during the quotation and evaluation phase.

Please share as much detail as possible in your first enquiry: drawing or sketch (PDF/DXF accepted), material specification (or the application if no material has been decided), required quantity, target delivery date, port of delivery, applicable standards, and any special requirements (TPI inspection, sub-zero testing, specific MTC format, etc.). The more detail you provide, the faster and more precisely we can respond.