Introduction
42CrMo steel is a Chinese alloy steel and has high strength and toughness, good hardenability and no obvious brittleness in quenching. After quenching and tempering treatment, it has a high fatigue limit and resistance to multiple impacts, as well as good impact toughness at low temperatures.
Forms
42CrMo alloy steel generally used for engineering steel purposes and to manufacture important parts that require higher strength and larger hardened section size than 35CrMo steel, such as axles, crankshafts, large gears for locomotive traction, supercharger gears, gears of gearboxes, engine cylinders, oil drilling pipe joints, large load rods and spring clips.
data sheet
Chemical Composition of 42CrMo Steel
| Chemical composition % | |||||||
| Steel Grade | W | Yes | Mn | P | s | Cr | Mo |
| 42CrMo | 0.38 to 0.45 | 0.17 to 0.37 | 0.50 to 0.80 | ≤ 0.030 | ≤ 0.030 | 0.90 to 1.20 | 0.15 to 0.25 |
Mechanical Properties of 42CrMo Alloy Steel
- Yield strength: ≥ 930 MPa
- Tensile strength: ≥ 1080 MPa
- Elongation: ≥12%
- Area reduction rate: ≥45%
- Impact absorption energy: ≥ 63 J
- Material Brinell hardness: ≤229 (high temperature annealed or quenched steel rod)
- Sample diameter: 25mm
Heat Treatment Specification
- First quenching heating temperature: 850 °C (Cooling – oil)
- Quenching heating temperature: 560 °C (Cooling – water, oil)
Equivalent
42CrMo steel equivalent to US AISI ASTM, European EN (Germany DIN EN, UK BSI EN, France NF EN, Japan JIS and ISO standard.
| China | USA | Germany | UK | Japan | France | ISO | |||||||
| Standard | Note | Standard | Note | Standard | Grade (steel number) | Standard | Grade (steel number) | Standard | Note | Standard | Grade (steel number) | Standard | Note |
| GB/T 3077 | 42CrMo | SAE, AISI; ASTM A29/A29M |
AISI 4140 steel | DIN EN 10083-3 | 42CrMo4 (1.7225) | EN 10083-3 | 42CrMo4 (1.7225) | JIS G4105 | SCM440 | NF EN10083-3 | 42CrMo4 (1.7225) | ISO 683-17 | 43CrMo4 |
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