40NiCrMo10-5 (1.6745) Forging Parts | China ISO-Certified Forging Manufacturer

About 40NiCrMo10-5 (1.6745) Alloy Steel Forgings

Jiangsu Liangyi Co.,Limited was founded in 1997, it is an ISO 9001:2015 certified professional China-based manufacturer of high-quality 40NiCrMo10-5 (also known as 1.6745, according to DIN EN 10083-3 standard) open die forging parts and seamless rolled steel forged rings. Our company is located in Jiangyin, it has  80,000㎡ manufacturing facility with an annual production capacity of 120,000 tons. Our company provide custom 40NiCrMo10-5 forging products to industrial clients over 50 countries across Europe, North America, Oceania, and the Middle East.

We provide complete end-to-end manufacturing process from steel melting, open die forging, seamless ring rolling, heat treatment to precision CNC machining, according to client drawings and custom technical specifications. The weight of our 1.6745 forged parts ranging from 30KGS to 30,000KGS per unit, it makes that we can meet the demands of heavy industrial applications, with complete material certification and complete traceability for every order.

Available 40NiCrMo10-5 (1.6745) Forged Product Forms

We produce a complete range of custom 1.6745 forging products to meet different kind of industrial needs, produced with our advanced forging equipment and strict quality control standards:

40NiCrMo10-5 Forged Bars & Rods

• 40NiCrMo10-5 forged round bars, square bars, flat bars, and rectangular bars
• 1.6745 hollow bars and solid rods for heavy machinery applications

1.6745 Seamless Rolled Rings & Casings

• Seamless rolled 40NiCrMo10-5 steel rings, gear rings, and slewing bearing rings
• 1.6745 forged hubs, housings, shells, sleeves, bushes, and pressure vessel casings
• 40NiCrMo10-5 forged pipes, tubes, barrels, and hydraulic cylinders

40NiCrMo10-5 Forged Shafts & Gear Components

• 40NiCrMo10-5 forged shafts, gear shafts, pinion shafts, step shafts, spindles, and crankshafts
• 1.6745 forged gear wheels, discs, blocks, plates, and custom flanges
• Complete custom 40NiCrMo10-5 forged components manufactured according to your drawings

Main Advantages of 40NiCrMo10-5 (1.6745) Alloy Steel

40NiCrMo10-5 (1.6745) is a high-strength, high-toughness chromium-nickel-molybdenum alloy steel with great hardenability, fatigue resistance, and impact performance, so it is the best choice for heavy-duty, high-load industrial components operating in harsh working conditions.

Our Custom 40NiCrMo10-5 Forging Services

As a professional forging company in China, we have over 25 years production experience. We can provide complete production for 40NiCrMo10-5 (1.6745) steel.

Requirements for the Melting of 40NiCrMo10-5 (1.6745) Steel 

We produce 1.6745 alloy steel according to international melting and refining standards, which can make sure consistent material quality and mechanical performance:

• We process primary melting via basic oxygen (BOF) or basic electric arc furnaces (EAF); acid furnace melting is strictly prohibited
• Approved secondary refining processes include vacuum induction melting (VIM), vacuum degassing (VD), argon-oxygen decarburization (AOD), vacuum oxygen decarburization (VOD), electroslag remelting (ESR), and vacuum arc remelting (VAR)
• All steel is fully silicon-killed and manufactured to a fine austenitic grain practice for optimal mechanical properties and uniform microstructure

Chemical Composition of 40NiCrMo10-5 (1.6745) Steel

The chemical composition of our 40NiCrMo10-5 forging steel follows DIN EN 10083-3 standard, with the following controlled element ranges:

Mechanical Properties of 1.6745 (40NiCrMo10-5) Forging Material

Our 40NiCrMo10-5 forgings have consistent, high-performance mechanical properties after standard quenching and tempering heat treatment, which can meet the demands of heavy industrial applications:

• Yield Strength (Re): Minimum 830 MPa
• Tensile Strength (Rm): Minimum 980 MPa
• Elongation (A): Minimum 12%
• Reduction of Area (Z): Minimum 55%
• Notch Impact Toughness (KU2): Minimum 80 J
• Hardness (Softened Annealed State): Maximum 269 HB
• Material Density: 7.85 kg/dm³

Forging & Heat Treatment Process Specification

We follow standardized forging and heat treatment processes to make sure better microstructure, mechanical performance, and dimensional accuracy for all 1.6745 components, we can provide whole process traceability for every order:

Hot Forging Process

1. Preheat the raw material to a uniform temperature of 1150°C - 1200°C, with precise holding time calculated based on cross-section thickness to make sure temperature penetration
2. Perform open die forging with our 2000T-6300T hydraulic forging presses, with controlled deformation ratio to make sure internal grain refinement and structural integrity
3. Keep forging operations above the 850°C temperature to avoid internal cracking, material brittleness, and structural defects
4. Post-forging controlled cooling: cool the workpiece slowly in sand or dry lime to prevent thermal stress cracking and make sure uniform initial microstructure formation

Final Heat Treatment Process

To get the specified mechanical properties, all 40NiCrMo10-5 forgings have standardized quenching and tempering treatment, with parameters customized based on component size and client requirements:

• Austenitizing: Heat the workpiece to 830-860°C, with holding time proportional to cross-section thickness to make sure uniform austenite formation
• Quenching: Oil quenching to get martensitic transformation, with controlled cooling rate to prevent distortion and cracking
• Tempering: Secondary heating to 540-680°C, with precise temperature control and holding time to get the required hardness, strength, and toughness balance
• Final cooling: Air cooling to room temperature after tempering, with optional stress relief treatment for large or complex components

Quality Control & Inspection Capabilities

We have an in-house ISO 9001:2015 certified quality control laboratory, with advanced inspection equipment to make sure every 40NiCrMo10-5 forging meets your specifications, international standards, and project requirements. We provide complete EN 10204 3.1/3.2 Mill Test Certificates (MTC) for every product.We have complete material traceability from raw steel melting to finished component.

Non-Destructive Testing (NDT)

• We do automatic ultrasonic testing with digital drive and data acquisition systems for internal defect detection, according to EN 10228-3 standard
• Manual ultrasonic testing for complex geometry components and targeted internal defect inspection
• Magnetic particle testing (MPT) for surface and near-surface defect detection, according to EN 10228-1 standard
• Dye penetrant inspection (visible or fluorescent FPI) for non-magnetic components and surface defect detection

Dimensional & Material Testing

• High-precision coordinate measuring machines (CMM) and laser dimensional checking equipment for tolerance verification
• Metallographic microscopes and scanning electron microscopes (SEM) for microstructure analysis and grain size verification
• Optical emission spectrometry for precise chemical composition analysis and material grade certification
• Universal tensile testing machines, impact testers, and hardness testers for all mechanical property verification

40NiCrMo10-5 (1.6745) Forging Applications & Industry Use Cases

40NiCrMo10-5 (1.6745) alloy steel forgings are commonly used in heavy-duty industries worldwide. Our China-manufactured forged components have a proven track record of reliable performance in harsh working environments, and they have been provided to global industrial clients in the following applications:

Main Industry Applications

• Wind power & renewable energy
• Oil & gas exploration and production
• Mining, quarrying & mineral processing
• Hydro & thermal power generation
• Cement, sugar & heavy processing industries
• Marine, shipbuilding & offshore engineering
• Railway & locomotive transportation
• Heavy machinery & hydraulic equipment

Real-World 40NiCrMo10-5 Forging Application Cases

Why Choose Jiangsu Liangyi as Your 40NiCrMo10-5 Forging Partner?

We are a China-based professional forging company, we have over 25 years of experience in 1.6745 alloy steel processing, we are your best choice for your end-to-end  global industrial projects. Below is the reason to choose us:

• We have complete in-house production from raw steel melting to finished CNC machining, with no third-party outsourcing, which can make sure our process quality control and complete traceability
• We have state-of-the-art forging equipment including 6300T hydraulic forging press, 5M seamless ring rolling machine, 10+ heat treatment furnaces, and 5-axis CNC machining centers
• We are 100% according to international manufacturing standards including DIN EN, ASTM, AISI, JIS, API 6A, and ISO, with complete certification support for global projects
• We have common custom forging capability from 30KGS small components to 30,000KGS large heavy forgings, so we can support both small-batch prototype development and large-scale mass production
• We have professional technical team with 20+ years of alloy steel forging experience, so we can provide free material selection guidance, process optimization, and engineering support for your projects
• We provide reliable global delivery production, with long-term partnerships with leading shipping lines, and we can support flexible delivery terms (FOB, CIF, EXW, DDP) to all main ports all over the world
• We have lots of English-speaking sales and after-sales support team, with 24/7 response to your inquiries and project requirements, which can make sure seamless communication