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E: enquiry@qilumetal.com
E: enquiry@qilumetal.com
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35CrMo7
Qilu
DIN 35CrMo7 (also designated as 1.2302) is a premium chromium-molybdenum alloy cold tool steel that strictly complies with the European standard EN 17350. As a medium-carbon alloy steel, it contains a carbon content ranging from 0.30% to 0.40%, combined with carefully balanced additions of chromium and molybdenum. This unique chemical composition, when paired with precise quenching and tempering heat treatment, endows the steel with an outstanding combination of mechanical properties—high tensile strength, excellent toughness, superior fatigue resistance, and remarkable hardenability.
What sets 35CrMo7 apart is its versatility in handling high-stress and high-load scenarios across multiple industries. Its ability to maintain structural integrity at elevated temperatures, coupled with good weldability, makes it a top choice for critical components where reliability and performance are non-negotiable. Whether in heavy machinery, automotive engineering, petroleum drilling, or power generation, this alloy steel delivers consistent performance that meets the most demanding industrial requirements.
Understanding steel equivalents is crucial for global manufacturers and buyers seeking compatible materials across different regional standards. Below is a comprehensive comparison of 35CrMo7 with its international counterparts:
Country | ISO | Germany |
Standard | ISO 4957 | DIN17350 |
Grade | 35CrMo7 | 35CrMo7/1.2302 |
The precise chemical makeup of 35CrMo7 (1.2302) is critical to its exceptional properties.
Grade | C | Si | Mn | P | S | Cr | Mo |
35CrMo7/1.2302 | 0.30-0.40 | 0.30-0.70 | 0.60-1.00 | 0.030Max | 0.030Max | 1.50-2.00 | 0.35-0.55 |
35CrMo7 exhibits remarkable mechanical performance, especially after proper heat treatment. Below are the key properties across different heat treatment conditions:
Heat Treatment | Hardness |
Annealed (+A) | HB300Max |
| Hardening and Tempering (+HT) | HRC60 Min |
| Quenched and tempred (+QT) | HRC28-32(Common Range) |
Tensile Strength: ≥ 980 MPa
Yield Strength: ≥ 830 MPa
Elongation: ≥ 12% (in 200mm gauge length)
Impact Toughness (Charpy V-notch): ≥ 47 J at room temperature
Hardenability: Fully hardenable up to 80mm section thickness; maintains uniform properties across large components
The tempering temperature directly impacts the hardness of 35CrMo7. Below is a practical reference for adjusting tempering to achieve desired hardness:
| Tempering Temperature (°C) | Approximate Hardness (HRC) |
| 400 | 58-60 |
| 500 | 50-54 |
| 540-660 | 28-32 |
| 650 | 25-28 |
Note: This is a general guide. Actual hardness may vary based on section size and heat treatment parameters.
We offer 35CrMo7 in a wide range of product forms to meet diverse industrial needs. All products adhere to strict dimensional tolerances and surface finish standards:
Product type | Size range | Length |
Hot rolled bar | Φ10-Φ190mm | 2000-5800mm |
Hot forged bar | Φ200-Φ600mm | 2000-5800mm |
Hot rolled plate/sheet | T:10-60mm; W:310-810mm | 2000-5800mm |
Hot forged plate | T:70-250mm; W:310-810mm | 2000-5800mm |
Hot Forged block | T: 260-500mm; W: 300-1000mm | 2000-5800mm |
Custom sizes are available upon request to match specific project requirements.
Surface Finish | Turned | Milled | Grinding(Best) | Polished(Best) | Peeled(Best) | Black Forged | Black Rolled |
Tolerance | +0/+3mm | +0/+3mm | +0/+0.05mm | +0/+0.05mm | +0/+0.1mm | +0/+5mm | +0/+1mm |
Straighness | 1mm/1000mm max. | 3mm/1000mm max. | |||||
Black Forged/Rolled: Cost-effective option for rough machining applications; retains the natural oxide layer from forging/rolling.
Turned/Milled: Machined surface with uniform finish, suitable for intermediate fabrication steps.
Peeled: Smooth surface with minimal material removal, ideal for components requiring good dimensional accuracy.
Ground/Polished: Precision finish with tight tolerances, perfect for high-precision parts (e.g., machine tool spindles, hydraulic components).
To ensure consistent quality and performance, 35CrMo7 is produced using advanced steelmaking and forging techniques:
We utilize state-of-the-art processes to purify the steel and control its chemical composition:
EF + LF + VD: Electric Arc Furnace (EF) melting, Ladle Furnace (LF) refining, and Vacuum Degassing (VD) for reduced impurities and uniform composition.
EAF + LF + VD + ESR: Enhanced process with Electro-Slag Remelting (ESR) for ultra-pure steel with improved cleanliness, finer grain structure, and superior mechanical properties (ideal for critical applications like turbine shafts).
Forging optimizes the steel’s grain structure, enhancing strength and toughness:
Initial Forging Temperature: 1150 - 1200°C (ensures optimal ductility for shaping)
Final Forging Temperature: ≥ 850°C (prevents grain coarsening and maintains structural integrity)
Cooling Method: Furnace cooling (controlled cooling to minimize residual stresses and avoid cracking)
Proper heat treatment is essential to unlock the full potential of 35CrMo7. Below are detailed guidelines for common processes:
Purpose: Reduce hardness, improve machinability, and relieve internal stresses from forging/rolling.
Process: Heat the steel to 830 - 860°C, hold at temperature for 2 - 4 hours (depending on section size), then cool slowly in the furnace at a rate of 50 - 100°C per hour.
Result: Hardness ≤ HB 300; improved ductility and machinability.
Purpose: Achieve balanced strength, toughness, and fatigue resistance (most common heat treatment for industrial components).
Quenching Process: Heat to 830 - 860°C, hold for 1 - 2 hours, then quench in oil (ensures uniform hardening without cracking).
Tempering Process: Reheat the quenched steel to 540 - 660°C, hold for 2 - 4 hours, then cool in air.
Result: Hardness HRC 28 - 32; excellent tensile strength, impact toughness, and fatigue limit.
Purpose: Maximize hardness and wear resistance for tooling and high-wear components.
Process: Heat to 840 - 870°C, quench in oil, then temper at 180 - 220°C for 1 - 2 hours.
Result: Hardness ≥ HRC 60; high wear resistance for precision tools and components.
Above curve in figure is a rough guide to the tempering behaviour of steels.
35CrMo7 is trusted in industries worldwide for its exceptional comprehensive properties. Below are its key application areas with specific use cases:
1. Heavy Machinery & Equipment Manufacturing
Gears: Large heavy-duty gears in heavy trucks, construction machinery (excavators, loaders), mining equipment, and wind turbine gearboxes (handles high torque and cyclic loads).
Shaft Components: Machine tool spindles (high precision and rigidity), engine crankshafts (withstands repeated bending and torsion), heavy-duty vehicle half-shafts, turbine rotor shafts, and compressor main shafts.
Connecting Rods: Large connecting rods in diesel engines and industrial compressors (resists tensile/compressive loads and fatigue stresses).
High-Strength Fasteners: Preload bolts for pressure vessels, pipeline flanges, and heavy-duty structural connections (maintains integrity under high pressure and temperature).
2. Petroleum & Chemical Industry
Drilling & Production Equipment: Drill pipe joints (resists corrosion and mechanical wear), sucker rods, pump shafts, and blowout preventer components (critical for safe oil/gas extraction).
Pressure Vessels: Containers and pipelines for medium-to-high temperature/pressure applications (handles corrosive media and cyclic pressure changes).
Compressor Components: Piston rods, valve plates, and crankshafts (endures high-speed motion and extreme pressure).
3. Automotive & Transportation
Engine Components: Crankshafts, camshafts, connecting rods, and gear shafts (optimized for power transmission and durability).
Transmission Systems: Transmission gears, drive shafts, and rear axle differential gears (handles high torque and smooth power transfer).
Steering & Suspension: Steering knuckles and universal joints for heavy-duty vehicles (ensures stability and load-bearing capacity).
4. Power & Energy Industry
Wind Power: Gear rings, main shafts, and high-speed shafts in wind turbine gearboxes (withstands variable wind loads and long-term operation).
Hydroelectric & Thermal Power: Turbine main shafts, turbine blades (resists high temperature and water erosion), and generator rotor shafts (critical for power generation efficiency).
5. Molds & Tools
Plastic Molds: Large, high-durability injection molds (withstands immense clamping forces and repeated cycles).
Die-Casting Molds: Pins, slides, and core components for aluminum and magnesium alloy die-casting (resists thermal shock and wear from molten metals).
A1: 35CrMo7 (EN 17350) is a European standard alloy steel with a higher chromium content (1.50-2.00%) compared to 35CrMo (GB/T 3077, Chinese standard: 0.80-1.10% Cr). This higher chromium content improves 35CrMo7’s hardenability, corrosion resistance, and high-temperature strength, making it suitable for more demanding applications (e.g., wind turbines, heavy-duty gears). 35CrMo is a cost-effective alternative for less critical components.
A2: Yes, 35CrMo7 has good weldability when proper procedures are followed. Pre-welding: Heat the base metal to 200-300°C to prevent cold cracking. Use low-hydrogen welding electrodes (e.g., E8018-B2) or flux-cored wires. Post-welding: Stress-relief anneal at 600-650°C to reduce residual stresses and maintain mechanical properties.
A3: 35CrMo7 has moderate corrosion resistance due to its chromium content. For harsh environments (e.g., marine, chemical plants), we recommend surface treatments such as galvanizing, chrome plating, or nitriding to improve corrosion resistance. For extreme corrosion conditions, consider stainless steel alternatives or contact our team for custom solutions.
A4: For gears, the optimal heat treatment is quenching and tempering (QT) to HRC 28-32, followed by carburizing or nitriding to enhance surface hardness (HRC 58-62). This combination ensures a tough core (resists impact and fatigue) and a hard surface (resists wear and pitting).
A5: All our 35CrMo7 products undergo strict quality control, including:
Chemical composition analysis (spectrometer testing)
Mechanical property testing (tensile, impact, hardness tests)
Ultrasonic testing (EN 10228-3 Class III or Sep 1921-84 D/D) to detect internal defects
Dimensional inspection (tolerance and straightness verification)
Surface quality inspection (visual and tactile checks)
A6: To prevent damage and corrosion during transit:
Hot rolled/forged products: Packaged in waterproof paper + steel strips, with rust-inhibiting oil applied for long-term storage.
Precision-machined (ground/polished) products: Wrapped in plastic film + protective sleeves, then packed in wooden crates.
Custom packaging options (e.g., seaworthy crates for international shipping) are available upon request.
Compliance with Standards: Strictly meets EN 17350 and DIN 17350 standards, ensuring consistent quality and compatibility with global applications.
Advanced Production Processes: Utilizes EF/LF/VD/ESR steelmaking and precision forging to deliver ultra-pure, high-performance steel.
Customization Capabilities: Flexible sizes, heat treatment, and surface finishes to match your unique requirements.
Strict Quality Control: 100% ultrasonic testing, chemical analysis, and mechanical property verification for every batch.
Global Supply Chain: Fast delivery to North America, Europe, Asia, and beyond; experienced in international shipping and customs clearance.
Technical Support: Our team of metallurgical engineers provides expert advice on material selection, heat treatment, and application optimization.
Contact us today to request a quote, technical data sheet, or custom solution for your 35CrMo7 needs. We’re committed to delivering high-quality steel that drives your industrial success.
DIN 35CrMo7 (also designated as 1.2302) is a premium chromium-molybdenum alloy cold tool steel that strictly complies with the European standard EN 17350. As a medium-carbon alloy steel, it contains a carbon content ranging from 0.30% to 0.40%, combined with carefully balanced additions of chromium and molybdenum. This unique chemical composition, when paired with precise quenching and tempering heat treatment, endows the steel with an outstanding combination of mechanical properties—high tensile strength, excellent toughness, superior fatigue resistance, and remarkable hardenability.
What sets 35CrMo7 apart is its versatility in handling high-stress and high-load scenarios across multiple industries. Its ability to maintain structural integrity at elevated temperatures, coupled with good weldability, makes it a top choice for critical components where reliability and performance are non-negotiable. Whether in heavy machinery, automotive engineering, petroleum drilling, or power generation, this alloy steel delivers consistent performance that meets the most demanding industrial requirements.
Understanding steel equivalents is crucial for global manufacturers and buyers seeking compatible materials across different regional standards. Below is a comprehensive comparison of 35CrMo7 with its international counterparts:
Country | ISO | Germany |
Standard | ISO 4957 | DIN17350 |
Grade | 35CrMo7 | 35CrMo7/1.2302 |
The precise chemical makeup of 35CrMo7 (1.2302) is critical to its exceptional properties.
Grade | C | Si | Mn | P | S | Cr | Mo |
35CrMo7/1.2302 | 0.30-0.40 | 0.30-0.70 | 0.60-1.00 | 0.030Max | 0.030Max | 1.50-2.00 | 0.35-0.55 |
35CrMo7 exhibits remarkable mechanical performance, especially after proper heat treatment. Below are the key properties across different heat treatment conditions:
Heat Treatment | Hardness |
Annealed (+A) | HB300Max |
| Hardening and Tempering (+HT) | HRC60 Min |
| Quenched and tempred (+QT) | HRC28-32(Common Range) |
Tensile Strength: ≥ 980 MPa
Yield Strength: ≥ 830 MPa
Elongation: ≥ 12% (in 200mm gauge length)
Impact Toughness (Charpy V-notch): ≥ 47 J at room temperature
Hardenability: Fully hardenable up to 80mm section thickness; maintains uniform properties across large components
The tempering temperature directly impacts the hardness of 35CrMo7. Below is a practical reference for adjusting tempering to achieve desired hardness:
| Tempering Temperature (°C) | Approximate Hardness (HRC) |
| 400 | 58-60 |
| 500 | 50-54 |
| 540-660 | 28-32 |
| 650 | 25-28 |
Note: This is a general guide. Actual hardness may vary based on section size and heat treatment parameters.
We offer 35CrMo7 in a wide range of product forms to meet diverse industrial needs. All products adhere to strict dimensional tolerances and surface finish standards:
Product type | Size range | Length |
Hot rolled bar | Φ10-Φ190mm | 2000-5800mm |
Hot forged bar | Φ200-Φ600mm | 2000-5800mm |
Hot rolled plate/sheet | T:10-60mm; W:310-810mm | 2000-5800mm |
Hot forged plate | T:70-250mm; W:310-810mm | 2000-5800mm |
Hot Forged block | T: 260-500mm; W: 300-1000mm | 2000-5800mm |
Custom sizes are available upon request to match specific project requirements.
Surface Finish | Turned | Milled | Grinding(Best) | Polished(Best) | Peeled(Best) | Black Forged | Black Rolled |
Tolerance | +0/+3mm | +0/+3mm | +0/+0.05mm | +0/+0.05mm | +0/+0.1mm | +0/+5mm | +0/+1mm |
Straighness | 1mm/1000mm max. | 3mm/1000mm max. | |||||
Black Forged/Rolled: Cost-effective option for rough machining applications; retains the natural oxide layer from forging/rolling.
Turned/Milled: Machined surface with uniform finish, suitable for intermediate fabrication steps.
Peeled: Smooth surface with minimal material removal, ideal for components requiring good dimensional accuracy.
Ground/Polished: Precision finish with tight tolerances, perfect for high-precision parts (e.g., machine tool spindles, hydraulic components).
To ensure consistent quality and performance, 35CrMo7 is produced using advanced steelmaking and forging techniques:
We utilize state-of-the-art processes to purify the steel and control its chemical composition:
EF + LF + VD: Electric Arc Furnace (EF) melting, Ladle Furnace (LF) refining, and Vacuum Degassing (VD) for reduced impurities and uniform composition.
EAF + LF + VD + ESR: Enhanced process with Electro-Slag Remelting (ESR) for ultra-pure steel with improved cleanliness, finer grain structure, and superior mechanical properties (ideal for critical applications like turbine shafts).
Forging optimizes the steel’s grain structure, enhancing strength and toughness:
Initial Forging Temperature: 1150 - 1200°C (ensures optimal ductility for shaping)
Final Forging Temperature: ≥ 850°C (prevents grain coarsening and maintains structural integrity)
Cooling Method: Furnace cooling (controlled cooling to minimize residual stresses and avoid cracking)
Proper heat treatment is essential to unlock the full potential of 35CrMo7. Below are detailed guidelines for common processes:
Purpose: Reduce hardness, improve machinability, and relieve internal stresses from forging/rolling.
Process: Heat the steel to 830 - 860°C, hold at temperature for 2 - 4 hours (depending on section size), then cool slowly in the furnace at a rate of 50 - 100°C per hour.
Result: Hardness ≤ HB 300; improved ductility and machinability.
Purpose: Achieve balanced strength, toughness, and fatigue resistance (most common heat treatment for industrial components).
Quenching Process: Heat to 830 - 860°C, hold for 1 - 2 hours, then quench in oil (ensures uniform hardening without cracking).
Tempering Process: Reheat the quenched steel to 540 - 660°C, hold for 2 - 4 hours, then cool in air.
Result: Hardness HRC 28 - 32; excellent tensile strength, impact toughness, and fatigue limit.
Purpose: Maximize hardness and wear resistance for tooling and high-wear components.
Process: Heat to 840 - 870°C, quench in oil, then temper at 180 - 220°C for 1 - 2 hours.
Result: Hardness ≥ HRC 60; high wear resistance for precision tools and components.
Above curve in figure is a rough guide to the tempering behaviour of steels.
35CrMo7 is trusted in industries worldwide for its exceptional comprehensive properties. Below are its key application areas with specific use cases:
1. Heavy Machinery & Equipment Manufacturing
Gears: Large heavy-duty gears in heavy trucks, construction machinery (excavators, loaders), mining equipment, and wind turbine gearboxes (handles high torque and cyclic loads).
Shaft Components: Machine tool spindles (high precision and rigidity), engine crankshafts (withstands repeated bending and torsion), heavy-duty vehicle half-shafts, turbine rotor shafts, and compressor main shafts.
Connecting Rods: Large connecting rods in diesel engines and industrial compressors (resists tensile/compressive loads and fatigue stresses).
High-Strength Fasteners: Preload bolts for pressure vessels, pipeline flanges, and heavy-duty structural connections (maintains integrity under high pressure and temperature).
2. Petroleum & Chemical Industry
Drilling & Production Equipment: Drill pipe joints (resists corrosion and mechanical wear), sucker rods, pump shafts, and blowout preventer components (critical for safe oil/gas extraction).
Pressure Vessels: Containers and pipelines for medium-to-high temperature/pressure applications (handles corrosive media and cyclic pressure changes).
Compressor Components: Piston rods, valve plates, and crankshafts (endures high-speed motion and extreme pressure).
3. Automotive & Transportation
Engine Components: Crankshafts, camshafts, connecting rods, and gear shafts (optimized for power transmission and durability).
Transmission Systems: Transmission gears, drive shafts, and rear axle differential gears (handles high torque and smooth power transfer).
Steering & Suspension: Steering knuckles and universal joints for heavy-duty vehicles (ensures stability and load-bearing capacity).
4. Power & Energy Industry
Wind Power: Gear rings, main shafts, and high-speed shafts in wind turbine gearboxes (withstands variable wind loads and long-term operation).
Hydroelectric & Thermal Power: Turbine main shafts, turbine blades (resists high temperature and water erosion), and generator rotor shafts (critical for power generation efficiency).
5. Molds & Tools
Plastic Molds: Large, high-durability injection molds (withstands immense clamping forces and repeated cycles).
Die-Casting Molds: Pins, slides, and core components for aluminum and magnesium alloy die-casting (resists thermal shock and wear from molten metals).
A1: 35CrMo7 (EN 17350) is a European standard alloy steel with a higher chromium content (1.50-2.00%) compared to 35CrMo (GB/T 3077, Chinese standard: 0.80-1.10% Cr). This higher chromium content improves 35CrMo7’s hardenability, corrosion resistance, and high-temperature strength, making it suitable for more demanding applications (e.g., wind turbines, heavy-duty gears). 35CrMo is a cost-effective alternative for less critical components.
A2: Yes, 35CrMo7 has good weldability when proper procedures are followed. Pre-welding: Heat the base metal to 200-300°C to prevent cold cracking. Use low-hydrogen welding electrodes (e.g., E8018-B2) or flux-cored wires. Post-welding: Stress-relief anneal at 600-650°C to reduce residual stresses and maintain mechanical properties.
A3: 35CrMo7 has moderate corrosion resistance due to its chromium content. For harsh environments (e.g., marine, chemical plants), we recommend surface treatments such as galvanizing, chrome plating, or nitriding to improve corrosion resistance. For extreme corrosion conditions, consider stainless steel alternatives or contact our team for custom solutions.
A4: For gears, the optimal heat treatment is quenching and tempering (QT) to HRC 28-32, followed by carburizing or nitriding to enhance surface hardness (HRC 58-62). This combination ensures a tough core (resists impact and fatigue) and a hard surface (resists wear and pitting).
A5: All our 35CrMo7 products undergo strict quality control, including:
Chemical composition analysis (spectrometer testing)
Mechanical property testing (tensile, impact, hardness tests)
Ultrasonic testing (EN 10228-3 Class III or Sep 1921-84 D/D) to detect internal defects
Dimensional inspection (tolerance and straightness verification)
Surface quality inspection (visual and tactile checks)
A6: To prevent damage and corrosion during transit:
Hot rolled/forged products: Packaged in waterproof paper + steel strips, with rust-inhibiting oil applied for long-term storage.
Precision-machined (ground/polished) products: Wrapped in plastic film + protective sleeves, then packed in wooden crates.
Custom packaging options (e.g., seaworthy crates for international shipping) are available upon request.
Compliance with Standards: Strictly meets EN 17350 and DIN 17350 standards, ensuring consistent quality and compatibility with global applications.
Advanced Production Processes: Utilizes EF/LF/VD/ESR steelmaking and precision forging to deliver ultra-pure, high-performance steel.
Customization Capabilities: Flexible sizes, heat treatment, and surface finishes to match your unique requirements.
Strict Quality Control: 100% ultrasonic testing, chemical analysis, and mechanical property verification for every batch.
Global Supply Chain: Fast delivery to North America, Europe, Asia, and beyond; experienced in international shipping and customs clearance.
Technical Support: Our team of metallurgical engineers provides expert advice on material selection, heat treatment, and application optimization.
Contact us today to request a quote, technical data sheet, or custom solution for your 35CrMo7 needs. We’re committed to delivering high-quality steel that drives your industrial success.
