All kinds of spring steel heat treatment specification and hardness requirements

- Sep 12, 2017 -

Steel grade

Quenching temperature

quenching medium

Hardness requirement

Tempering temperature

Cooling medium

Hardness requirement

Range of application

65

780-830

Water or oil


400-600



Wire diameter is less than 12 to 15 mm   coil spring, spring washer

65Mn

810-830

Water or oil

>60 

370-400

Water

42-50

5-10 mm plate spring and 7-10 mm coil   spring

50CrV

850-870

oil

>58

400-550

Water

45-50

Cross section is larger and more   important plate spring slice and helical spring

50CrV

850-870

oil

>58

370-420


45-52

300 c below the hot spring

60Si2MnA

860-880

oil

>60

500-520

Water

HB363-444

8 and 12 mm thickness plate spring


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