Q215B carbon steel

Q215B, is a carbon steel.
Chemical composition (mass fraction) (%)
C: 0.09-0.15
Mn: 0.25-0.55
Si: ≦ 0.30
S: ≦ 0.050 (A grade), ≦ 0.045 (B grade)
P: ≦ 0.045
Deoxidation method: F, b, Z
Mechanical Properties
Tensile strength (σb / MPa): 335-450
Elongation (δ5 /%):
≧ 31 (a ≦ 16mm), ≧ 30 (a> 16-40mm)
≧ 29 (a> 40-60mm), ≧ 28 (a> 60-100mm)
≧ 27 (a> 100-150mm), ≧ 26 (a> 150mm)
Wherein a is the thickness or diameter of steel.