Bright Tube Grade
Chemical Composition (%)
C
Si
Mn
P
S
Max Limit
St35
≤0.18
0.17–0.37
0.35–0.65
0.035
0.035
St37.4 (10#)
≤0.18
0.17–0.37
0.35–0.65
0.035
0.035
St45 (20#)
≤0.25
0.17–0.37
0.50–0.80
0.035
0.035
St55 (35#)
≤0.22
≤0.55
≤1.50
0.035
0.035
St52 (16Mn)
≤0.20
≤0.55
≤1.50
0.035
0.035
CK45
0.42–0.50
0.17–0.37
0.50–0.80
0.035
0.035
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