Critical Point, Quenching Heating Temperature and Ms Point of Common Steel

Critical point of common steel

Grade

Critical point / ℃

Ac1

Ac3 or Accm

Ar1

Ar3

10

725

870

682

850

10Mn2A

720

830

620

714

12CrNi3A

695

800

659

726

100CrNi3A

680

12Cr2Ni4A

670

780

575

660

100Cr2Ni4A

670

15

725

870

685

850

15Mn

735

863

685

840

15SiMn2MoVA

722

848

491

15Cr

735

870

720

15CrMnA

750

848

15CrMnMoVA

765

870

18Mn2CrMoB

741

854

18Cr2Ni4WA

655~695

20

735

855

680

835

20Mn

735

854

682

835

20Mn2

690

820

(610)

(760)

20Mn2B

730

835

613

730

20MnVB

720

840

635

770

20MnTiB

(720)

843

625

795

20MnMoB

738

850

693

750

20Cr

766

838

702

799  

20CrV

768

840

704

782

20CrMnB

890

622

749

20CrNi

735

805

660

790

20CrNi3A

710

790

20Cr2Ni4A

705

770

575

660

22CrMnMo

710

830

620

740

30

732

813

677

796

30Mn2

718

804

627

727

30Mn

734

812

675

796

30SiMnMoV

740

845

30Si2Mn2MoWV

739

798

30CrMnSi

760

830

670

705

30CrMo

757

807

693

763

30CrMnTi

765

790

500

740

30CrMnSiNi2A

750~760

805~830

30CrNi3

705

750

35SiMn

750

830

645

35CrMoV

755

835

600

35CrMo

755

800

695

750

35CrMnSi

760

830

670

705

38Cr

740

780

693

730

38CrMoAl

800

840

730

37CrNi3

710

770

640

38CrSi

763

810

680

755

40

724

790

680

760

40Mn

726

790

689

768

40Mn2

713

766

627

704

40MnB

730

780

650

700

40MnVB

730

774

639

681

40Cr

743

782

693

730

40CrV

755

790

700

745

40CrMnMo

735

780

680

40CrSi

755

850

40CrMnSiMoV

780

830

40CrMnSiMoVRe

725

850

625

715

40Cr 5M02VSi

853

915

720

830

40SiMnMoVRe

765

900

625

730

40CrNi

731

769

660

702

40CrNiMo

710

790

40CrMo

730

780

45

724

780

682

751

45Mn2

715

770

640

720

45Mn2V

725

770

45Cr

721

771

660

693

50

720

765

690

720

50Mn

720

760

660

50Mn2

710

760

596

680

50Cr

721

771

660

692

50CrV

752

788

688

746

50CrMn

750

775

55

727

774

690

755

55Si2Mn

775

840

55Si2MnB

764

794

55Si2MnVB

765

803

60

727

766

690

743

60Mn

727

765

689

741

60Si2Mn

755

810

700

770

65

727

752

696

730

65Mn

726

765

689

741

70

730

743

693

727

85

723

737

695

T7

730

770

700

T8

730

700

T10

730

800

700

T11

730

810

700

T12

730

820

700

SiMn

760

865

708

9SiCr

770

870

730

CrWMn

750

940

710

3Cr2W8V

820

1100

790

3Cr2W8

810

1100

W18Cr4V

820

1330

760

W9Cr4V2

810

760

3Cr 3Mo 3VNb

836~948

771~923

Cr12V

810

760

 Cr12MoV

815

Cr 12Mo

810

1200

760

5C rMnMo

710

760

650

5CrNiMo

710

770

680

GCr15

745

900

700

GCr15SiMn

770

872

708

1Cr13

730

850

700

820

2Cr13

820

950

780

3Cr13

780~850

4Cr13

790~850

Cr17Ni2

810

710

9Cr18

830

810

4Cr9Si2

900

970

810

870

4Cr10Si2Mo

850

950

700

845

 Mn13

Quenching heating temperature and Ms point of common steel

Grade

Quenching heating temperature (℃)

Ms/℃

10

900~920(water)or no heat treatment

450

10Mn2A

850~857(water)

12CrNi3A

860(oil)

780~810(oil)

(420)

100CrNi3A

860(oil)

780~810(oil)

150

12Cr2Ni4A

860(oil)

780(oil)

400

100Cr2Ni4A

880(oil)

780(oil)

125

15

890~920(water)

450

15Mn

850~900(water)

410

15SiMn2MoVA

880(oil)

275

15Cr

 860(oil)

  780~810(oil)

15CrMnA

840~870(oil)

810~840(oil)

400

15CrMnMoVA

965~985(air or oil)

372

18Mn2CrMoB

920(air or oil)

320

18Cr2Ni4WA

950(air)

860~870(oil)

310

100Cr2Ni4WA

75

20

900~950(water)

425

20Mn

850~900(water)

(420)

20Mn2

860~880(water)

880~910(oil)

370

20Mn2B

860~880(oil)

20MnVB

860~880(oil)

230

20MnTiB

 860~890(oil)

20MnMoB

850~890 (oil)

20Cr

860~880(oil)

(390)

20CrV

 870~900(oil)

20CrMnB

860~880(water or oil)

20CrNi

840~880(water or oil)

(410)

20CrNi3A

820~-840(oil)

(340)

20Cr2Ni4A

(330)

22CrMnMo

830~850(oil)

30

850~890(water or oil)

380

30Mn2

820~840(water)

830~850(oil)

340

30Mn

850~900(oil)

355

30SiMnMoV

850~890(oil)

30Si2Mn2MoWV

950(oil)

310

30CrMnSi

870~890(oil)

320

30CrMo

850~880(water or oil)

345

30CrMnTi

870~890(oil)

30CrMnSiNi2A

890~900(oil)

314

30CrNi3

830(oil)

305

35SiMn

880~900(oil)

(330)

35CrMoV

900~920(water or oil)

35CrMo

820~840(water)

830~850(oil)

271

35CrMnSi

850~870(oil)

38Cr

860(oil)

250

38CrMoAl

930~950(oil)

(370)

37CrNi3

820(oil)

(280)

38CrSi

900~920(water or oil)

(330)

40

830~880(water or oil)

(340)

40Mn

820~860(water or oil)

40Mn2

810~850(oil)

(340)

40MnB

820~860(oil)

40MnVB

830~870(oil)

40Cr

830~860(oil)

(355)

40CrV

880(oil)

218

40CrMnMo

840~860(oil)

40CrSi

900~920(water or oil)

(320)

40CrMnSiMoV

920 (oil)

290

40CrMnSiMoVRe

930 (oil)

270

40Cr 5M02VSi

1000(air)

325

40SiMnMoVRe

930 (oil)

300~305

40CrNi

820~840

271

40CrNiMo

850(oil)

320

40CrMo

820~840(water)

360

45

780~860(water or oil)

(345)

45Mn2

810~840(oil)

320

45Mn2V

840-860 (water)

310

45Cr

820 ~ -840 (oil)

(355)

50

820~850 (water or oil)

(320)

50Mn

780 ~ 840  (water or oil)

320

50Mn2

810-840 (oil)

325

50Cr

820 (oil)

250

50CrV

860 (oil)

(270)

50CrMn

840~860 (oil)

(250)

55

790~830(water)

820~850 (oil)

(290)

55Si2Mn

850~880(water or oil)

(280)

55Si2MnB

870(oil)

55Si2MnVB

880(oil)

60

780~830(water or oil)

270

60Mn

790~820(oil or 160℃nitrate)

270

60Si2Mn

840~860(water or oil)

305

65

780~830(water or oil)

270

65Mn

790-820(oil or 160℃nitrate)

270

70

780~830(water or oil)

230

85

780~820(water or oil)

220

T7

800~820(water)

250~300

T8

780~820(water)

225~250

T10

770~790(water)

175~210

T11

770~790(water)

200

T12

770~790(water)

SiMn

780~840(water, oil or nitrate)

(250)

9SiCr

860~870(oil)

(170)

CrWMn

800~830(oil)

(250)

3Cr2W8V

1050~1100(oil)

(340)

3Cr2W8

1075~1130(oil)

330

W18Cr4V

1280~1300(oil)

(220)

W9Cr4V2

1225~1240(oil)

(200)

3Cr 3Mo 3VNb

1060~1090(oil)

385

Cr12V

1040~1080(oil)

180

 Cr12MoV

1040~1050

1120~1130(air or)

(<185)

Cr 12Mo

950~1000(oil)

(225)

5C rMnMo

820~850(oil)

(220)

5CrNiMo

830~860(oil)

(220)

GCr15

820~850(oil)

(240)

GCr15SiMn

820~840(oil)

1Cr13

980~1050(oil)

(350)

2Cr13

980~1050(oil)

320

3Cr13

980~1050(oil)

(240)

4Cr13

980~1050(oil)

145~270

Cr17Ni2

950~970(oil)

357

9Cr18

1050~1075(oil)

4Cr9Si2

1000~1050(oil)

4Cr10Si2Mo

1010~1050(oil or air)

 Mn13

1050(oil or water)

200

Note: the data in brackets in the table need further study because:

1. Different data provide different data for the same steel type, but only one is selected in this table:

2. The data of the same steel type is gathered from different data.

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