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| Warranty: | a Year |
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42CrMo4 round steel belongs to alloy structural steel, has good mechanical properties and machinability, quite widely used, mainly has plate and round rod two types of materials, its comprehensive performance is better than 40cr, has been recognized by the industry.
42CrMo4 round steel, with high strength and toughness, hardenability is also good, no obvious tempering brittleness, tempering treatment after higher fatigue limit and resistance to multiple impacts, low temperature impact toughness is good. 42CrMo steel is suitable for manufacturing large and medium-sized plastic molds requiring certain strength and toughness.
Chemical composition of 42CrMo4 round steel
C: 0.38 ~ 0.45%
Si: 0.17 ~ 0.37%
Manganese Mn: 0.50 ~ 0.80%
Sulfur S: Allowable residual content ≤0.035%
P: Allowable residual content ≤0.035%
Cr: 0.90 ~ 1.20%
Nickel Ni: Allowable residual content ≤0.30%
Copper Cu: Allowable residual content ≤0.30%
Molybdenum Mo: 0.15 ~ 0.25%
Mechanical properties editor broadcast
Hardness: Annealed,147~241HB
42CrMo4 round steel mechanical properties:
Tensile strength σb (MPa) : ≥1080(110)
Yield strength σs (MPa) : ≥930(95)
Elongation δ5 (%) : ≥12
Reduction rate of cross-section (%) : ≥45
Impact power Akv (J) : ≥63
Impact toughness value αkv (J/cm2) : ≥78(8)
Hardness: ≤217HB
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In order to improve the die life of 42CrMo4 round steel to more than 800 thousand dies, hardening and low temperature tempering can be implemented on the pre-hardened steel. Quenching at 500-600ºC preheat 2-4 hours, and then at 850-880ºC hold heat for a certain time (at least 2 hours), into the oil cooling to 50-100ºC oil air cooling, quenching hardness can reach 50-52HRC, in order to prevent cracking should be immediately 200ºC low temperature tempering treatment, after tempering, hardness can be maintained above 48HRC.
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