Using heating, holding and cooling methods make metal internal organization structure change in order to obtain the organization structure of workpiece using performance.Different steel after different heat treatment process,workpiece performance will be different.Understand the common steel hardness after tempering in different temperature can also help you to choose the appropriate heat treatment equipment.Tianli Furnace,we mainly fabricate kinds of heat treatment furnace,such as quenching furnace, (high temperature/medium temperatuer/low temperature)tempering furnace, annealing furnace, normalizing furnace, etc.

Common steel hardness after tempering in different temperature
JIS DIN ASTM Steel No. Quenching Temp./℃ Coolant Tempering Temp./℃
150～200 200～300 300～400 400～500 500～600 600～650
Hardness after tempering HRC( OR HB)
SWRCH30K CK30 1525 30Mn 840～880 water 54～52 196
SWRCH50K CK50 1053 50Mn 800～840 water 50
oil (295～246)
S60C-CSP 1566 65Mn 790～815 oil 60～58 58～54 54～47 47～39 39～30
SMn443 46Mn7 1345 45Mn2 800～840 oil 39～34 43～33 (325～246)
SCr440 42Cr4 5140 40Cr 825～860 oil 54～52 52～45 45～36 36～30 30～27
G4106 SMnC443 41Cr4 5140 40CrMn 860～880 oil 48～53
SNC236 1720036CrNiMo4 8640 40CrNi 800～840 oil 45～50 (255～286)
40CrNiMoA 830～850 oil 48～53 44～49 (400℃)
30CrMnSi 860～890 oil 34～41
35CrMn 860～870 oil 45～53
SNC836 37CrNi3 810～840 oil 45～52 (321～387)
G480 1722167E 1065 65 780～815 oil ≥52 52～45 37～28
SK5-CSP C85E 1084 85 770～800 oil 40～49 45～37
50CrMnVA 850～880 oil/water 39～43
Cr12 1000～1050 oil 64～61 61～58 58～56 56～53 53～43
3Cr2W8 1075～1125 oil 52～49 49～48 48～46 46～45 45～48 48～40