SAE4140/DIN1.7225 alloy steel round bar/mould steel/special steelDescription:1. DIN1.7225/SAE4140/GB42CrMo, JIS SCM440 alloy steel round bar2. Hot rolled or forged condition, annealing or harden, black or milled surface3. Pre-heat treatment:Annealing: Heat to 840-860° C, keep 2H, furnace cold, hardness≤ 217HBSHigh temperature tempering: Heat to 680-700° C, air cold, hardness ≤ 217HBS4. Heat treatment:Normalization: Heating to 840 to 880 ° C, maintenance, furnace cooling to 600 ° C, then in air.Stress relieving: After rough heat to 500 ° C, maintenance raff. In oven to 400 ° C, then in air.Hardening: Preheating from 600 to 650 ° C austenitizingAt 840 to 880 ° C, quenching in oil.Tempering: Heating to 550 - 650 ° C and maintenance regime, again depending on the mechanicalProperties5. Hot rolled technology: EAF+LF+VDForged technology: EAF+LF+VD+ESR+Forging +Q T + Machined surface6. Ultrasonic test standard: SPE1921-GR3, CLASS C/C or D/D7. Production leadtime: 7~10 daysApplications:1. General service industries (petroleum, food, chemical, paper, fertilizer, Fabric, aviation and nuclear)Fluid, gas and oil transport2. Pressure and heat transmission3. Construction and ornament4. Boiler heat exchangersCompetitive Advantage:1. Good purity and homogeneity2. Good machinability(Roughing, grinding and drilling)3. Good dimensional stability during heat treatment4. Excellent preparation for nitriding, both ionic and gaseous, induction hardening to increase theMechanical properties5. Competitive price6. Fast production leadtime7. All the material are inspected with 3 times to meet the highly standards.
