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Common Structural Special Steel Round Bars Diameters and Chemical Composition
20#, 45#, GCr15, GCr4, 40CrUP, 40CrUC, 40Mn2, 20CrMnTi, 42CrMo are common structural special steel grades. Below is the detail of these structural steel round bars diameter and composition.
Quality Carbon Structural Steels
|
Grade |
Diameter（mm） |
Standard |
C |
Si |
Mn |
P |
S |
Ni |
Cu |
Cr |
|
20 |
|
|
0.17-0.23 |
0.17-0.37 |
0.35-0.65 |
≤0.035 |
≤0.035 |
≤0.30 |
≤0.25 |
≤0.25 |
|
45 |
0.42-0.50 |
0.17-0.37 |
0.35-0.65 |
≤0.035 |
≤0.035 |
≤0.30 |
≤0.25 |
≤0.25 |
Alloy Structure Steel
|
Grade |
Diameter（mm） |
Standard |
C |
Si |
Mn |
P |
S |
Ni |
Cu |
Cr |
Mo |
|
40Cr |
￠18-60 |
GB/T |
0.37-0.44 |
0.17-0.37 |
0.50-0.80 |
≤0.035 |
≤0.035 |
≤0.30 |
≤0.30 |
0.80-1.10 |
≤0.15 |
Bearing Steel
|
Grade |
Diameter（mm） |
Standard |
C |
Si |
Mn |
P |
S |
Ni |
Cu |
Cr |
O |
Mo |
|
GCr15 |
￠18-60 |
GB/T |
0.95-1.05 |
0.15-0.35 |
0.25-0.45 |
≤0.025 |
≤0.025 |
≤0.30 |
≤0.30 |
1.40-1.65 |
12*10ˉ6 |
≤0.10 |
|
GCr4 |
￠18-60 |
GB/T |
0.95-1.05 |
0.15-0.30 |
0.15-0.30 |
≤0.025 |
≤0.020 |
≤0.25 |
≤0.20 |
0.35-0.50 |
12*10ˉ6 |
≤0.08 |
|
GCr15SiMn |
￠18-60 |
GB/T |
0.95-1.05 |
0.45-0.75 |
0.95-1.25 |
≤0.025 |
≤0.025 |
≤0.30 |
≤0.25 |
1.40-1.65 |
12*10ˉ6 |
≤0.10 |
|
Grade |
Diameter（mm） |
Standard |
C |
Si |
Mn |
P |
S |
Ni |
Cu |
Cr |
V |
Ti |
Mo |
|
20CrMnTi |
￠18-60 |
GB/T |
0.17-0.23 |
0.17-0.37 |
0.80-1.10 |
≤0.035 |
≤0.035 |
≤0.30 |
≤0.30 |
≤1.00-1.30 |
0.04-0.10 |
≤0.15 |
|
