42CrMo4 Forging Steel
42CrMo4 (1.7225) is a medium-carbon low-alloy forging steel with excellent hardenability, high strength after Q+T (tensile 900-1100 MPa), and reliable toughness. Available as forged round bars (80-1500mm), blocks up to 30 tons, and rings up to 5m diameter for shafts, gears, and heavy machinery components.
| Material | Alloy Steel (Medium Carbon Cr-Mo) |
|---|---|
| Grade / Standard | EN 42CrMo4 (1.7225) / DIN 42CrMo4 |
| Diameter | Round Bar: 80mm - 1500mm / Block: up to 30 Tons / Ring: up to 5000mm OD |
| Length | Up to 12m (Round Bar) / Custom (Forged Block & Ring) |
| Delivery Condition | hot_rolled / normalized / quenched_tempered / annealed |
| Surface Treatment | painting / polished / coated |
| MOQ | 1 Piece (Custom Forging) / 1 Ton (Standard Bar) |
| Delivery Time | 30-60 Days (Custom Forging) / 15-25 Days (Stock Bar) |
| Loading Port | Tianjin / Shanghai / Qingdao |
Overview of 42CrMo4 Forging Steel
42CrMo4 is one of the most widely used medium-carbon low-alloy steel grades for forging applications worldwide, specified under EN 10083-3 standard with material number 1.7225. Containing approximately 0.42% carbon, 1.0% chromium, and 0.2% molybdenum, this versatile alloy steel offers an excellent combination of high strength, good toughness, deep hardenability, and reliable performance in heat-treated condition. 42CrMo4 has become the international benchmark for medium-strength forged components requiring through-hardening capability.
The addition of chromium provides hardenability and tempering resistance, while molybdenum enhances high-temperature strength and reduces susceptibility to temper embrittlement. After quenching and tempering (Q+T) heat treatment, 42CrMo4 achieves tensile strength of 900-1100 MPa with yield strength exceeding 700 MPa and acceptable impact toughness for demanding mechanical applications. The grade is supplied in forged round bar, forged block, forged ring, and forged shaft forms, manufactured through open-die forging or closed-die forging processes depending on geometry and quantity requirements.
Key Features and Forging Manufacturing
42CrMo4 forging steel is produced through electric arc furnace (EAF) or basic oxygen furnace (BOF) melting, followed by ladle refining and vacuum degassing for premium quality applications. The refined steel is then hot forged using hydraulic press or hammer forging at temperatures between 1100-1200°C, with controlled cooling to prevent thermal cracking and internal stress. Forging ratio typically exceeds 4:1 to ensure complete dendritic structure breakdown and homogeneous mechanical properties throughout the component cross-section.
For critical applications, 42CrMo4 forgings undergo additional processes including normalizing, annealing, quenching and tempering (Q+T), or stress relieving heat treatment to achieve specified mechanical properties. Ultrasonic testing (UT) per EN 10228-3 or ASTM A388 is standard for forgings over 100mm in cross-section, ensuring internal soundness and detection of any forging defects. The forging is supplied in dimensions from 80mm to 1500mm diameter for round bars, forged blocks up to 30 tons, and forged rings up to 5 meters outer diameter, with custom forging service available for specific component geometries.
Main Applications of 42CrMo4 Forging Steel
42CrMo4 forging steel is the primary material for heavy machinery component manufacturing including transmission shafts, propeller shafts, crankshafts, connecting rods, gear blanks, and pinion shafts in industrial gearboxes, mining equipment, marine propulsion systems, and heavy vehicle drivetrains. The wind power generation industry uses 42CrMo4 forgings for main shafts, gearbox shafts, planet carriers, and yaw drive components in onshore and offshore wind turbines requiring 20+ year operational reliability under variable load conditions.
The oil and gas industry employs 42CrMo4 for drill collars, drill pipe tool joints, downhole tools, mud motor housings, wellhead equipment, and Christmas tree forgings operating in high-pressure sour service environments. Power generation applications include steam turbine shafts, gas turbine compressor shafts, generator rotor shafts, and pump shafts in nuclear, thermal, and hydroelectric power plants. Other major applications include heavy crane hook forgings, port machinery slewing bearings, railway locomotive axles, mining truck wheel hubs, hydraulic press components, large diameter flanges for petrochemical equipment, and pressure vessel forgings for chemical processing facilities.
Why Choose Us for 42CrMo4 Forging Steel
Shandong Tanglu Metal Material Co., Ltd. supplies premium 42CrMo4 forging steel manufactured by major Chinese forging mills with proven international project experience including ISO 9001, ISO 14001, ASME, and PED certified production facilities. Every 42CrMo4 forging undergoes mandatory chemical composition analysis, mechanical property testing including tensile, yield, elongation, impact, and hardness verification, ultrasonic testing (UT), and dimensional inspection per EN 10083-3 or customer specification.
We offer comprehensive forging services including open-die forging for round bars and rings, closed-die forging for high-volume components, ring rolling for seamless rings up to 5 meters diameter, and custom forging per customer drawings with rough machining, semi-finished machining, or finished machining options. With monthly forging capacity of 3,000 tons of alloy steel forgings and established export experience to wind power, oil and gas, marine, and heavy machinery sectors in over 40 countries, we support both small prototype orders and large series production. Each shipment includes original mill test certificate (MTC) conforming to EN 10204 3.1 standard, with EN 10204 3.2 and third-party inspection (SGS, BV, ABS, DNV, LR) available for critical applications requiring enhanced documentation.
📐 Dimension & Size Table
| Diameter (mm) | Length (m) | Weight (kg/m) | Forging Process |
|---|---|---|---|
| 80 | 1.0 - 6.0 | 39.46 | Open-die / Hammer |
| 100 | 1.0 - 6.0 | 61.65 | Open-die / Hammer |
| 150 | 1.0 - 6.0 | 138.72 | Open-die / Hydraulic Press |
| 200 | 1.0 - 6.0 | 246.62 | Open-die / Hydraulic Press |
| 250 | 1.0 - 5.0 | 385.34 | Hydraulic Press |
| 300 | 1.0 - 5.0 | 554.89 | Hydraulic Press |
| 400 | 1.0 - 4.0 | 986.47 | Hydraulic Press |
| 500 | 1.0 - 4.0 | 1541.35 | Hydraulic Press |
| 600 | 1.0 - 3.5 | 2219.55 | Heavy Hydraulic Press |
| 800 | 1.0 - 3.0 | 3945.86 | Heavy Hydraulic Press |
| 1000 | 1.0 - 2.5 | 6165.40 | Heavy Hydraulic Press |
| 1200 | 1.0 - 2.0 | 8878.18 | Heavy Hydraulic Press |
| 1500 | 1.0 - 2.0 | 13872.16 | Heavy Hydraulic Press |
* Custom sizes available upon request. Tolerances per relevant international standards.
🔬 Chemical Composition
| Element | Min | Max | Display Value | Note |
|---|---|---|---|---|
| C | 0.38 | 0.45 | 0.38-0.45 | Per EN 10083-3 |
| Si | - | 0.40 | ≤0.40 | |
| Mn | 0.60 | 0.90 | 0.60-0.90 | |
| P | - | 0.025 | ≤0.025 | |
| S | - | 0.035 | ≤0.035 | |
| Cr | 0.90 | 1.20 | 0.90-1.20 | Hardenability element |
| Mo | 0.15 | 0.30 | 0.15-0.30 | Tempering resistance element |
| Ni | - | 0.40 | ≤0.40 | Residual element |
| Cu | - | 0.30 | ≤0.30 | Residual element |
| V | - | 0.05 | ≤0.05 | Residual element |
* Chemical composition may vary by heat, thickness and specification. Please refer to the actual mill test certificate.
⚙️ Mechanical Properties
| Property | Value | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Q+T, d≤16mm) | 1100-1300 | MPa | Quenched & Tempered |
| Tensile Strength (Q+T, 16<d≤40mm) | 1000-1200 | MPa | Quenched & Tempered |
| Tensile Strength (Q+T, 40<d≤100mm) | 900-1100 | MPa | Quenched & Tempered |
| Tensile Strength (Q+T, 100<d≤250mm) | 800-950 | MPa | Quenched & Tempered |
| Yield Strength (Q+T, d≤16mm) | ≥900 | MPa | 0.2% proof stress |
| Yield Strength (Q+T, 40<d≤100mm) | ≥650 | MPa | 0.2% proof stress |
| Elongation (A5) | ≥10-12 | % | Depending on thickness |
| Reduction of Area (Z) | ≥45-50 | % | Depending on thickness |
| Impact Energy (KV2) | ≥35-50 | J | Charpy V-notch at +20°C |
| Brinell Hardness (Annealed) | ≤241 | HBW | Soft annealed condition |
| Brinell Hardness (Q+T) | 270-360 | HBW | Quenched & Tempered |
* Values shown are minimum requirements unless otherwise stated.
📦 Commercial Information
| Packaging | Standard seaworthy export packing for forging components. Forged round bars bundled with steel strapping (3-5 wraps per bundle), bundle weight typically 2-5 tons depending on diameter. Large forgings (>500mm diameter or >5 tons single piece) packed individually with wooden cradles, steel angle protection, and waterproof film wrapping. Custom packaging including wooden crates and vacuum-sealed packing available for premium machined components. Each forging tagged with heat number, grade designation (42CrMo4 / 1.7225), dimensions, weight, and heat treatment condition for full traceability. |
|---|---|
| Payment Terms | T/T (Telegraphic Transfer),L/C (Letter of Credit),D/P (Documents against Payment),Western Union,PayPal |
| Price Term | FOB,CFR,CIF,EXW |
| Supply Capacity | 3,000 Tons/Month (Alloy Steel Forgings) |
| Loading Port | Tianjin / Shanghai / Qingdao |
Why Choose Our 42CrMo4 Forging Steel?
Mill Certified Premium Forgings
42CrMo4 forging supplied with original mill test certificate EN 10204 3.1/3.2, including chemical composition analysis, mechanical properties from quenched & tempered samples, ultrasonic testing report per EN 10228-3 or ASTM A388, and complete metallurgical traceability from heat to finished forging.
Comprehensive Forging Capability
Round bars from 80mm to 1500mm diameter, forged blocks up to 30 tons single piece, and seamless rolled rings up to 5000mm outer diameter. Custom forging service per customer drawings with rough, semi-finished, or finished machining options available.
Excellent Heat Treatment Response
Through-hardening capability with deep hardenability allows uniform mechanical properties up to 250mm cross-section. Q+T treatment achieves tensile strength 900-1100 MPa with yield ≥650 MPa and impact toughness ≥35J at +20°C, ideal for high-stress dynamic load applications.
Multi-Industry Certifications
Multi-standard certifications including ISO 9001, CE / PED, ABS, DNV GL, Lloyd's Register, BV, SGS, NK, and RINA. Production facilities approved for wind power, oil and gas, marine, nuclear, and heavy machinery applications requiring code-compliant forgings from approved manufacturers.
Reliable Forging Production
Standard round bar delivery 15-25 days from stock. Custom forging production 30-60 days depending on size and complexity. Established export logistics with experience shipping forgings up to 30 tons single piece via 40FT FCL or break-bulk vessel arrangements.
🏭 Applications of 42CrMo4 Forging Steel
42CrMo4 forging steel is the primary material for heavy machinery and energy industry forging components requiring high strength, good toughness, and through-hardening capability. Wind power generation applications include main shafts, gearbox shafts, planet carriers, yaw drive components, and pitch drive components in 1.5MW to 10MW+ wind turbines for both onshore and offshore installations requiring 20+ year operational reliability. Heavy machinery applications include transmission shafts, propeller shafts, crankshafts, connecting rods, gear blanks, pinion shafts, and clutch components in industrial gearboxes, mining equipment, construction equipment, and heavy vehicle drivetrains. Oil and gas industry uses 42CrMo4 for drill collars, drill pipe tool joints, downhole tools, mud motor housings, wellhead Christmas tree forgings, and BOP body forgings operating in high-pressure sour service environments. Power generation applications include steam turbine shafts, gas turbine compressor shafts, generator rotor forgings, and primary pump shafts in nuclear, combined cycle, and conventional thermal power plants. Other major applications include heavy crane hook forgings, port crane slewing bearings, railway locomotive axles, mining truck wheel hubs, hydraulic press piston rods, large diameter flanges for petrochemical equipment, and pressure vessel forgings for chemical processing facilities.
📋 Quality & Certification
Our Certifications
- ✅ ISO 9001:2015
- ✅ CE Marking
- ✅ ABS
- ✅ DNV GL
- ✅ Lloyd's Register (LR)
- ✅ Bureau Veritas (BV)
- ✅ SGS Certified
- ✅ NK
- ✅ RINA
Mill Certificate Type
- 📋 EN 10204 3.1
- 📋 EN 10204 3.2
- 📋 Original Mill Certificate
- 📋 Third Party Inspection Available
- 📋 Certificate of Origin
❓ Frequently Asked Questions
What is 42CrMo4 forging steel?
42CrMo4 is a medium-carbon low-alloy steel grade specified under EN 10083-3 standard with material number 1.7225, containing approximately 0.42% carbon, 1.0% chromium, and 0.2% molybdenum. It is one of the most widely used alloy steels for forging applications worldwide, offering an excellent combination of high strength (tensile 900-1100 MPa after Q+T), good toughness, deep hardenability up to 250mm cross-section, and reliable performance in heat-treated condition. The grade is the international benchmark for medium-strength forged shafts, gears, and heavy machinery components requiring through-hardening capability.
What is the equivalent grade of 42CrMo4?
42CrMo4 has direct equivalent grades in major international standards: AISI 4140 (American standard, identical chemistry and properties), ASTM A29 4140 (American forging standard), JIS SCM440 (Japanese standard, same Cr-Mo chemistry), GB 42CrMo (Chinese standard equivalent), and AFNOR 42CD4 (French standard). All these grades share virtually identical chemical composition and mechanical properties, making them interchangeable for most engineering applications. AISI 4140 is the most commonly referenced equivalent in North American markets, while 42CrMo is the standard designation in Chinese manufacturing.
What heat treatments are recommended for 42CrMo4 forgings?
42CrMo4 forgings can undergo several heat treatments depending on application requirements. Soft annealing (680-720°C, slow cool) achieves hardness ≤241 HBW for machining. Normalizing (840-880°C, air cool) provides uniform microstructure with improved machinability. Quenching and tempering (Q+T): austenitize at 830-860°C, oil quench, then temper at 540-680°C to achieve target tensile strength 800-1100 MPa. Stress relieving (550-650°C, slow cool) is performed after rough machining to minimize distortion. For surface hardening applications, induction hardening can achieve HRC 52-58 surface hardness with tough core, ideal for wear-resistant components like gear teeth and shaft journal areas.
What sizes and forms are available for 42CrMo4 forgings?
42CrMo4 is available in multiple forged forms: forged round bars from 80mm to 1500mm diameter with lengths up to 12 meters, forged blocks up to 30 tons single piece for large machinery components, seamless rolled rings up to 5000mm outer diameter for wind turbine main bearings and slewing rings, and custom forgings per customer drawings for shafts, gear blanks, and complex geometries. Standard delivery conditions include hot rolled (mill scale), normalized, annealed, or quenched and tempered (Q+T). Surface options include black forged, rough machined, semi-finished machined, or finished machined per project requirements.
Can you provide ultrasonic testing for 42CrMo4 forgings?
Yes. Ultrasonic testing (UT) is standard practice for 42CrMo4 forgings over 100mm in cross-section to verify internal soundness and detect any forging defects such as inclusions, cracks, or porosity. We perform UT per EN 10228-3, ASTM A388, or customer specification with quality classes ranging from class 1 (most stringent for nuclear and aerospace applications) to class 4 (general engineering applications). UT reports including indication maps, calibration records, and pass/fail certifications are provided as part of the EN 10204 3.1 or 3.2 mill test certificate package. Third-party UT inspection by SGS, BV, or other approved inspection agencies available upon request.
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42CrMo4 Forging Steel
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