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    Heat treatment to 845 C, slow cooling from 755 C at a rate of 14 C (25 F)/hour to 665 C, or rapid cooling to 675 C for 5 hours isothermal annealing. Tempering. Tempering temperature of 4140 alloy steel can be from 204-649 C (400-1200F) after normalizing and oil quenching, and the corresponding Rockwell hardness can be obtained. Forging

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    Surface Treatment: Black Surface/Turned/Rough Machined/Peeled HUNAN QILU INDUSTRIAL CO., LTD. ASTM 4140/ DIN 42CrMo4 /1.7225/JIS Scm440/GB 42CrMo Alloy Steel Round Bar

  6. AISI 4140 Steel Bar | 1.7225 | 42CrMo4 - Otai Special Steel

    6. AISI 4140 Steel Grade Heat Treatment. Annealing Heat ASTM 4140 steels to 800 oC 850 oC, hold until temperature is uniform throughout the section and cool in furnace. Normalizing Heat steel alloy 4140 to 870 oC 900 oC, hold until temperature is uniform throughout the section, soak for 10 15 minutes and cool in still air. Tempering

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