| Customization: | Available |
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| Type: | Square |
| Standard: | AISI |
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42CD4 round steel belongs to ultra-high strength steel, with high strength and toughness, good hardenability, no obvious tempering brittleness, high fatigue limit and resistance to multiple shocks after tempering treatment, low temperature impact toughness is good. 42CrMo steel is suitable for manufacturing large and medium-sized plastic molds requiring certain strength and toughness.
42CD40 chemical composition of 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 of SCM440 round steel
Hardness: Annealed,147~241HB
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
In order to increase the die life of 42CD4 round steel to more than 800,000 die times, the hardening method of quenching 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.
Salt bath vanadium treatment editor.
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