Critical point, quenching temperature and Ms point in steel

Critical point of common steel

Note Critical point
/℃
Ac 1 Ac 3 or Ac c I Air 1 Air 3
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
15 minutes 735 863 685 840
15SiMn2MoVA 722 848 491 –
15 cr 735 870 720 –
15CrMnA 750 848 – –
15CrMnMoVA 765 870 – –
18Mn2CrMoB 741 854 – –
18Cr2Ni4WA 655~695 – – –
20 735 855 680 835
20 minutes 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
20 cr 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
30 minutes 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
38 cr 740 780 693 730
38CrMoAl 800 840 730 –
37CrNi3 710 770 640 –
38CrSi 763 810 680 755
40 724 790 680 760
40 minutes 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 – –
40CrMnSiMoVR 725 850 625 715
40Cr 5M02VSi 853 915 720 830
40SiMnMoVR 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
50 minutes 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
65 minutes 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 –
1Ch13 730 850 700 820
2Ch13 820 950 780 –
3Ch13 780~850 – – –
4Ch13 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

Note Extinguishing Heating Temperature
(℃)		 IN
/℃
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
15 minutes 850~900(water) 410
15SiMn2MoVA 880 (oil) 275
15 cr 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
20 minutes 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) –
20 cr 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
30 minutes 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) –
38 cr 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）
40 minutes 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
40CrMnSiMoVR 930 (oil) 270
40Cr 5M02VSi 1000 (air) 325
40SiMnMoVR 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）
50 minutes 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 (160 ℃ oil or nitrate) 270
60Si2Mn 840~860(water or oil) 305
65 780~830(water or oil) 270
65 minutes 790-820 (160℃ oil or 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 1040~10501120~1130(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) –
1Ch13 980~1050(oil) (350)
2Ch13 980~1050(oil) 320
3Ch13 980~1050(oil) (240)
4Ch13 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 requires further study because:

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

2. Data of the same type of steel is collected from different data.

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