42CrMo steel is high strength steel, with high toughness, which hardenability is also good.
42CrMo steel is high strength steel, with high toughness, which hardenability is also good, no obvious tempering brittleness, high fatigue limit and resistance to multiple shocks after tempering treatment, the impact toughness is good in low temperature. The steel is suitable for manufacturing medium-sized plastic molds requiring certain strength and toughness.
Related Grade
Country | China | Japan | Germany | USA | British |
Standard | GB/T 3077 | JIS G4105 | DIN (W-Nr.) | AISI/ASTM | BS 970 |
Grade | 42CrMo | SCM440 | 42crmo4/1.7225 | 4140 | EN19/709M40 |
Chemical Composition
Grade | C | Si | Mn | P | S | Cr | Mo | Ni |
42CrMo | 0.38-0.45 | 0.17-0.37 | 0.5-0.80 | ≤0.035 | ≤0.035 | 0.9-1.2 | 0.15-0.25 | - |
SCM440 | 0.38-0.43 | 0.15-0.35 | 0.6-0.85 | ≤0.035 | ≤0.04 | 0.9-1.2 | 0.15-0.30 | - |
42crmo4/1.7225 | 0.38-0.45 | ≤ 0.4 | 0.6-0.9 | ≤0.025 | ≤0.035 | 0.9-1.2 | 0.15-0.30 | - |
4140 | 0.38-0.43 | 0.15-0.35 | 0.75-1.00 | ≤0.035 | ≤0.04 | 0.8-1.1 | 0.15-0.25 | - |
EN19/709M40 | 0.35-0.45 | 0.15-0.35 | 0.5-0.80 | ≤0.035 | ≤0.035 | 0.9-1.5 | 0.2-0.40 | - |
Mechanical Property
Grade | Tensile strength σb(MPa) | Yield strength σs (MPa) | Elongation δ5 (%) | Reduction ψ (%) | Impact Value Akv (J) | Hardness |
4140 | ≥1080 | ≥930 | ≥12 | ≥45 | ≥63 | 28-32HRC |
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