Classification of steel Iron materials

1 Carbon structural steel:
Q195-Q195F, Q195b, Q195, Q215-Q215AF, Q215Ab, Q215A, Q215BF, Q215Bb, Q215B, Q235-Q235AF, Q235Ab, Q235A, Q235BF, Q235Bb, Q235B, Q235C, Q235D, Q255-Q255A, Q255B, Q275-Q275

2 Low alloy high strength structural steel:
Composition of general low alloy high strength structural steel grades
Q295-Q295A, Q295B, Q345-Q345A, Q345B, Q345C, Q345D, Q345E, Q390-Q390A, Q390B, Q390C, Q390D, Q390E, Q420-Q420A, Q420B, Q420C, Q420D, Q420E, Q460-Q460C, Q460D, Q460E
Special low alloy high strength structural steel
Special low-alloy high-strength structural steel generally uses the pinyin letter «Q» representing the yield point, the yield point value (in MPa), and the first letter of the pinyin according to the purpose of the product is added at the end. For example, the steel grade of pressure vessel is expressed as «Q345R»; the steel grade of welded gas cylinder is expressed as «Q295HP», the steel grade of boiler is expressed as «Q390g»; the steel grade of bridge is expressed as «Q420q», etc.

3 High-quality carbon structural steel:
08F, 10F, 15F, 08, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 15Mn, 20Mn, 25Mn, 30Mn, 35Mn, 40Mn, 45Mn, 50Mn, 60Mn, 65Mn, 70Mn

4 Free-cutting structural steel:
Y12, Y12Pb, Y15, Y15Pb, Y20, Y30, Y35, Y40Mn, Y45Ca

5 Alloy structural steel:
20Mn2, 30Mn2, 35M2, 40Mn2, 45Mn2, 50Mn2, 20MnV, 27MnSi, 35MnSi, 42MnSi, 20SiMn, 25SiMn2MoV, 37SiMn2Mov, 40B, 45B, 50B, 40MnB, 45MnB, 20MnnMoB, 15MnVb, 20MnVB, 40MnVb, 20MnVB, 40MnVb, 15CrA, 20Cr, 30Cr, 35Cr, 40Cr, 45Cr, 50Cr, 38CrSi, 12CrMo, 15CrMo, 20CrMo, 30CrMo, 30CrMoA, 35CrMo,
42CrMo, 12CrMo, 35CrMoV, 12Cr1MoV, 25Cr2MoVA, 25Cr2Mo1VA, 38CrMoAl, 40CrV, 50CrVA, 15CrMn, 20CrMn, 40CrMn, 20CrMnSi, 25CrMnSi, 30CrMnSi, 35CrMnSiA, 20CrMnMo, 40CrMnMo, 20CrMnTi, 40CrMn, 40CrMn 12CrNi3, 20CrNi3, 30CrNi3, 37CrNi3, 12Cr2Ni4, 20Cr2Ni4, 20CrNiMo, 40CrNiMoA,
18CrNiMnMoA, 45CrNiMoVA, 18Cr2Ni4WA, 25Cr2Ni4WA

6 Spring steel:
65, 70, 85, 65Mn, 55Si2Mn, 55Si2MnB, 55SiMnVB, 60Si2Mn, 60Si2Mn, 60Si2MnA, 60Su2CrA, 60Si2CrVA, 60CrMnA, 60CrMnMoA, 50CrVA, 60CrMnBA, 30W4Cr2VA.

7 Ensure the hardenability of structural steel:
45H, 20CrH, 40CrH, 45CrH, 40MnBH, 45MnBH, 20MnMoBH, 20MnVBH, 22MnVBH, 20MnTiBH, 20CrMnMoH, 20CrMnTiH, 20CrNi3H, 12Cr2Ni4H, 20CrNiMoH.

8 Weathering steel for welding structure:
16CuCr, 12MnCuCr, 15MnCuCr, 15MnCuCr-QT

9 High weather resistance structural steel:
09CrPCrNi-A, 09CuPCrNi-B, 09CuP

10 Rolling bearing steel:
GCr6, GCr9, GCr9SiMn, GCr15, GCr15SiMn.

11 Chrome-free bearing steel:
GSiMnV, GSiMnVXT, GSiMnMoV, GSiMnVXT, GMnMov, GMnMoVXT

12 Carburized bearing steel:
G20CrMo, G20CrNiMo, G20CrNi2Mo, G20Cr2Ni4, G10CrNi3Mo, G20Cr2Mn2Mo

13 Carbon tool steel:
T7, T8, T8Mn, T9, T10, T11, T12, T13

14 Alloy tool steel

15 High-speed tool steel

16 stainless steel

17 Heat-resistant steel