30CrMo Steel Heat treatment

30CrMo steel is a alloy structural steel. 30CrMo plate is featured by high strength and toughness and high hardenability.

30CrMo Steel Heat treatment

Annealed annealing No.1 "760±10 °C annealing, furnace cooling to 400 ° C air cooling. Hardness: HB220-230.
Normalizing No.4 860±10°C normalizing, normal air cooling.
Quenching tempering No.5 840 ± 10 °C quenching or oil (depending on the complexity of the product shape), tempering 680-700 degrees. HB<217
Quenching tempering No.6 840 ± 10 ° C quenching, and then 470 degrees tempering. HRC41-45
Quenching tempering No.7 840 ± 10 ° C quenching, and then tempering 480 degrees. HRC35-45
Quenching tempering No.8 850 °C hardened, and then tempered 510 degrees. HRC38-42
Quenching tempering No.9 850 ° C hardened, and then tempered 500 degrees. HRC40-43
Quenching tempering No.10 850 ° C hardened, and then tempered at 510 ° C. HRC36-42
Quenching tempering No.11 850 ° C hardened, and then tempered at 560 ° C. HRC32-36
Quenching tempering No.12 860 °C hardened, and then tempered 390 degrees. HRC48-52
30CrMo material is usually used in a quenched and tempered state, and a steel having a lower carbon content can also be used as a carburized steel requiring a higher core strength. In the medium-sized machinery manufacturing industry, it is mainly used to manufacture quenched and tempered parts with large cross-section and working under high stress conditions, such as shafts, spindles and high-load steering wheels, bolts, studs, gears, etc.; in the chemical industry a welded structure for the manufacture of welded parts, plates and pipes, and a high-pressure pipe that does not exceed 250 ° C in a medium containing nitrogen and hydrogen; a fastener used in the manufacture of steam turbines and boilers for manufacturing below 450 ° C, High pressure flanges and nuts below 500 °C, especially suitable for the manufacture of ducts operating at 300 atm and below 400 °C.

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