Mold steel 40Cr 40Cr 40Cr mold mold material sample blank size (mm): 25 Heat treatment: first quenching temperature (℃): 850; cooling agent: oil the second quenching temperature (℃): - tempering heating temperature ( ℃): 520; coolant: water, oil and tensile strength (σb / MPa): ≧ 980 Yield point (σs / MPa): ≧ 785 Elongation (δ5 /%): ≧ 9 section shrinkage (ψ / %): ≧ 45 impact absorbed energy (Aku2 / J): ≧ 47 Brinell hardness (HBS100/3000) (annealing or tempering state): ≦ 207 GB of standard steel in China is 40Cr, German DIN Standard Material Number 1.17035 / 1.7045, DIN steel 41Cr4/42Gr4, British steel standard EN 18, BS standard steel 41Cr4, the French AFNOR standard steel 42C4, the French NF standards for steel 38Cr4/41Cr4, Italian UNI standard steel 41Cr4, Belgium NBN standard steel 42Cr4, Swedish standard steel SS 2245, American AISI / SAE / ASTM standards for steel 5140, Japan's JIS standard steel SCr440 (H) / SCr440, USA AISI / SAE / ASTM standards for steel 5140, the International Organization for Standardization ISO standard steel 41Cr4. [Critical temperature] (approximate) Acm = 780 ℃ 【specification】 normalizing temperature 850 ~ 870 ℃, hardness 179 ~ 229HBS. [Cold] rough handling practices softening temperature 740 ~ 760 ℃, holding time 4 ~ 6h, then 5 ~ 10 ℃ / h of cooling rate, cooling to ≤ 600 ℃, baked cooled. Treatment before the hardness ≤ 217HBS, soften the hardness ≤ 163HBS. [Health protection of iron swing tempering specification] (670 ± 10) ℃ × 2h, with the furnace temperature, (710 ± 10) ℃ × 2h, with the furnace cooling, (670 ± 10) ℃ × 2h, with the furnace temperature, (710 ± 10) ℃ × 2h, then with the furnace cooling, (670 ± 10) ℃ × 2h, with the furnace temperature, (710 ± 10) ℃ × 2h, with the furnace cooling, a total of three cycles, and then cooled to 550 ℃, baked air-cooled. Treatment hardness 153HBS 
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