Chemical Composition
Carbon C: ≤0.22%
Si Si: ≤0.35%
Manganese Mn: ≤1.4%
Sulfur S: ≤0.050%
Phosphorus P: ≤0.045%
Chromium Cr: to allow the residual content ≤0.030%
Ni: to allow the residual content ≤0.030%
Cu: to allow the residual content ≤0.030%
NOTE: deoxidation method: F, Z
Mechanical Properties
Tensile strength σb (MPa): 370 ~ 500
When> 60 ~ 100; ≥215:: Yield strength σs (MPa): ≤16 time: ≥235;:;> during 16 ~ 40 ≥225> 40 ~ 60 when ≥215;> 100 ~ 150 when: ≥195; > 150: ≥185
When> 60 ~ 100; ≥25::; elongation δ5 (%):: ≤40 When ≥26> 40 ~ 60 when ≥24;> 100 ~ 150 when: ≥22;> 150 ~ 200 when: ≥21 ;
Cold bending (bending 180 °): [portrait] steel thickness ≤16, the apex diameter d = a; steel thickness> 16 to 100, the apex diameter d = 2a;
[Lateral] steel thickness ≤16, the apex diameter d = 1.5a; steel thickness> 16 to 100, the apex diameter d = 2.5a;
Heat treatment and microstructure
Heat treatment: hot.
Microstructure: ferrite and pearlite.
Delivery status:
Generally hot-rolled (including controlled rolling) delivery. According to the requirements, by mutual agreement, can also be normalized delivery.
