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Pre hardened state (35-40HRC) easy to cut, no heat treatment after processing, small deformation
Excellent mirror polishing, Ra≤0.1μm， Suitable for high smoothness plastic parts
Good toughness, better corrosion resistance than ordinary carbon steel, and can be strengthened by nitriding
Replace imported steel with high cost-effectiveness
element | C | Si | Mn | Cr | Mo | V | Ni | S | P |
scope | 0.50–0.60 | ≤0.40 | 0.80–1.20 | 0.80–1.20 | 0.20–0.50 | 0.10–0.30 | 1.00–1.50 | 0.08–0.15 | ≤0.030 |
Tensile strength Rm (MPa) | Yield strength ReL (MPa) | Elongation A (%) | Reduction of area Z (%) | Impact toughness Akv (V-type J/cm² ) | hardness ( HRC ) |
1050-1180 | 1020-1160 | ≥ 14.5 | ≥ 40 | ≥ 62 | 35-40 |
Heating temperature: 1150 ℃ (uniform burning, anti overheating)
Initial forging temperature: 1050-1100 ℃
Final forging temperature: ≥ 850 ℃ (to avoid cold forging cracking)
Cooling after forging: Slow cooling (heap cooling/sand cooling, anti white spots and cracking)
Applicable: Large/complex cavity molds, thick plate forgings
Isothermal spheroidization annealing (softening)
Heating: 800-810 ℃, insulation for 2-4 hours
Isothermal: 680 ℃, insulation for 4-6 hours
Cool the furnace to 550 ℃ and remove it from the furnace, with a hardness of ≤ 200HBW, making it easy to cut
Quenching+tempering (pre hardening)
Quenching: 820-840 ℃ oil quenching, hardness 58-60HRC
Tempering: 620-650 ℃, holding for 3 hours, hardness 35-40HRC (delivered in pre hardened state)
Household appliance shell mold (washing machine, air conditioner, tape recorder)
Electronic/instrument precision injection molds, relay component molds
Toys, daily necessities, transparent parts molds (need polishing)
