Heat Treatment Process Table of Commonly Used Materials for Machining

The following table lists the heat treatment process data of stainless steel, carbon structural steel, carbon tool steel, alloy carburized steel, die steel, quenched and tempered steel, spring steel, nitrided steel, alloy cutting tool steel, bearing steel, etc. in machining, including annealing temperature, quenching temperature, martensite point, tempering temperature, etc.

Heat Treatment

Heat treatment chart for stainless steel

Steel type

Stainless steel

Steel grade

1Cr15

2Cr13

3Cr13

1Cr18Ni9Ti

 

 

4Cr13

 

Annealing temperature

780 850

780 850

780 850

820

Quenching temperature

1020

1050

1050

1050

Martensite point

350

350

240 270

 

Tempering temperature ℃

150

Hardness after tempering HRC

 

 

 

58

200

41

47

52

57

250

 

 

 

56

300

40

46

51

55

350

 

 

 

54

400

39

44

50

54

450

 

 

 

53

500

38

42

49

50

550

31

37

43

45

600

24

28

34

40

650

22

24

30

38

Heat treatment chart for carbon steel

Steel type

Carbon structural steel

Carbon tool steel

Steel grade

35

45

50

T8

T12

 

40

 

T7

T10

Annealing temperature

880 positive

860 positive

840 positive

760

770

Quenching temperature

850

840

830

780

780

Martensite point

350

340

320

230

210

Tempering temperature ℃

150

Hardness after tempering HRC

52

57

58

62

64

200

50

56

57

60

62

250

48

54

54

57

60

300

46

48

51

55

57

350

43

45

46

51

53

400

39

41

43

47

49

450

34

36

38

42

44

500

30

32

34

38

39

550

26

28

30

34

35

600

22

24

25

29

31

650

18

20

21

25

28

Heat treatment chart for alloy carbon steel

Steel type

Alloy carbon steel

Steel grade

20Mn2TiB

18CrNiw

20Cr

20Cr

25CrNiW

18CrMnTi

205iMnV1

   

30CrMnMoTi

Annealing temperature

900 positive

900 positive

900 positive

940 positive

850

Quenching temperature

860

860

880

800

850

Martensite point

360

310

380

 

300

Tempering temperature ℃

150

Hardness after tempering HRC

44

45

47

63

50

200

42

44

45

59

48

250

41

43

42

56

45

300

40

42

40

54

43

350

39

41

38

53

40

400

39

40

 

51

38

450

38

39

 

49

36

500

36

37

 

46

34

550

32

33

   

30

600

28

30

   

27

650

25

26

   

24

Heat treatment chart for die steel

Steel type

Die steel

Steel grade

Cr12 type

3Cr2W8

5CrMnMo

8Cr3

Cr9si2

   

5CrNiMo

7Cr3

 

Annealing temperature

860

820

850

830

800

Quenching temperature

1000

1080

850

870

1070

Martensite point

220

360

220

220

 

Tempering temperature ℃

150

Hardness after tempering HRC

63

52

59

62

62

200

61

49

58

60

61

250

60

48

56

59

60

300

59

48

53

58

59

350

58

47

51

56

58

400

58

46

48

53

54

450

57

44

45

50

50

500

56

45

42

47

47

550

53

48

39

45

43

600

50

45

35

41

39

Heat treatment chart for quenched and tempered steel

Steel type

Quenched and tempered steel

Steel grade

30CrNi3

35CrMnSi

37CrNiB

40Cr

45Cr

30CrMnNi2MoV

30CrMnSi

35CrMo

50B

45Mn2

Annealing temperature

820

860

820

840

840

Quenching temperature

860

880

860

850

850

Martensite point

300

360

270

320

310

Tempering temperature ℃

150

Hardness after tempering HRC

51

54

51

54

56

200

50

53

50

51

54

250

48

51

48

48

53

300

46

48

46

47

51

350

44

46

43

46

49

400

42

44

41

43

48

450

39

41

39

42

46

500

35

38

37

38

44

550

32

35

34

34

40

600

27

28

29

31

35

650

25

27

25

25

28

Heat treatment chart for spring steel & nitrided steel

Steel type

Spring steel

Nitrided steel

Steel grade

50CrV

60Si2Mn

65Mn

38CrAl

 

55Si2Mn

60Mn

38CrMoAl

annealing temperature

860

810

810

950 positive

quenching temperature

860

860

810

940

Martensite point

300

300

270

360

Tempering temperature ℃

150

Hardness after tempering HRC

57

62

61

57

200

55

59

58

55

250

53

57

56

53

300

51

55

54

51

350

48

51

50

48

400

46

48

47

46

450

43

45

43

43

500

40

41

38

40

550

36

37

34

36

600

32

33

30

34

650

 

30

31

26

30

Heat treatment chart for alloy cutting tool steel & bearing steel

Steel type

Alloy cutting tool steel

Bearing steel

Steel grade

9Crsi

CrMn

SiMn

GCr15

GCr15SiMn

 

CrWMn

CrW5

Cr20

 

Annealing temperature

800

790

800

790

790

Quenching temperature

860

840

850

850

830

Martensite point

170

250

240

240

200

Tempering temperature ℃

150

Hardness after tempering HRC

64

64

65

63

64

200

63

62

63

61

63

250

61

60

61

59

62

300

59

58

59

55

59

350

56

55

56

52

53

400

54

53

54

49

51

450

51

50

51

45

 

500

48

47

48

41

 

550

44

43

44

36

 

600

40

39

40

28

 

650

36

35

36

26

 

Heat treatment chart for spring steel

Steel type name

Spring steel

Nitrided steel

Steel grade

50CrV

60Si2Mn

65Mn

38CrAl

 

55Si2Mn

60Mn

38CrMoAl

Annealing temperature

860

810

810

950 positive

Quenching temperature

860

860

810

940

Martensite point

300

300

270

360

Tempering temperature ℃

150

Hardness after tempering HRC

57

62

61

57

200

55

59

58

55

250

53

57

56

53

300

51

55

54

51

350

48

51

50

48

400

46

48

47

46

450

43

45

43

43

500

40

41

38

40

550

36

37

34

36

600

32

33

30

34

650

30

31

26

30

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