40Cr mold 40Cr 40Cr steel mold mold material sample blank dimensions (mm): 25 heat treatment: the first time the quenching temperature (° C): 850; coolant: the second oil quenching temperature (° C): - tempering the heating temperature ( ° C): 520; coolant: water, oil tensile strength (σb / MPa): ≧ 980 yield point (σs / MPa): ≧ 785 Elongation (δ5 /%): ≧ 9 section shrinkage rate (ψ / %): ≧ 45 impact absorbed energy (Aku2 / J): ≧ 47 Brinell hardness (HBS100/3000) (annealing or high temperature tempered condition): ≦ 207 China GB Standard steel, 40Cr, the German DIN standard material number 1.17035 / 1.7045, the German DIN standard steel No. 41Cr4/42Gr4 English EN standard steel No. 18, British BS standard steel 41Cr4, the French AFNOR standard steel 42C4, French NF standard steel 38Cr4/41Cr4, Italy UNI standard steel 41Cr4, Belgium NBN standard steel 42Cr4, Sweden SS standard steel No. 2245, U.S. steel AISI / SAE / ASTM standards 5140 steel, Japanese JIS standard steel SCr440 (H) / SCr440, the United States steel AISI / SAE / ASTM standard steel No. 5140, the International Organization for Standardization ISO Standard Steel 41Cr4. [Critical temperature (approximate) Acm = 780 ° C [normalizing norms] temperature of 850 ~ 870 ° C, the hardness of 179 ~ 229HBS. [Cold press rough softening specification] temperature of 740 ~ 760 ℃, 4 ~ 6h, of the holding time and cooling rate of 5 ~ 10 ° C / h, cooling to ≤ 600 ° C, cooled baked. Before it is processed the hardness the ≤ 217HBS, soften the hardness ≤ 163HBS. [Health protection of iron swing tempering specification (670 ± 10) ℃ × 2h, with the furnace temperature (710 ± 10) ℃ × 2h, followed by furnace cooling, (670 ± 10) ℃ × 2h, with the furnace temperature (710 ± 10) ℃ × 2h, and then followed by furnace cooling, (670 ± 10) ℃ × 2h, with the furnace temperature (710 ± 10) ℃ × 2h, with furnace cooling, a total of three cycles, and then cooling to 550 ° C, baked air-cooled. The hardness 153HBS treatment 
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