Q235B carbon structural steel

Q235B steel plate is a low carbon steel. The national standard GB/T 700-2006 "Carbon Structural Steel" has a clear definition. Q235B is one of the most common steels in China with low price and can be used for most products with low performance requirements.

Q235B chemical composition:
Carbon C: ≤0.20
Silicon Si: ≤0.35
Manganese Mn: ≤1.4
Sulfur S: ≤0.045
Phosphorus P: ≤0.045
Chromium Cr: Allowable residual content≤0.30
Nickel Ni: Allowable residual content ≤ 0.30
Copper Cu: allowable residual content ≤ 0.30
Note: Deoxidation method: F, b, Z

Q235B mechanical properties:
Yield Strength (σb/MPa):
Thickness or diameter≤16mm:≥235
Thickness or diameter 16-40mm: ≥225
Thickness or diameter 40—100mm: ≥215
Thickness or diameter 100—150mm: ≥195
Thickness or diameter 150—200mm: ≥185
Tensile strength: 370—500.
Impact test: Temperature: 20℃: ≥27/J

The difference between Q235A and Q235B: all steels are carbon steels. In the national standard GB700-88, the material distinction between Q235A and Q235B is mainly in terms of carbon content of steel.

The plate of Q235A is not subjected to impact test, while Q235B is subjected to impact test at room temperature with V-notch. Relatively speaking, the mechanical properties of steel made of Q235B are much better than those of steel made of Q235A.

Q235B has certain elongation, strength, good toughness and castability, easy to punch and weld, and is widely used in the manufacture of general mechanical parts. It is mainly used for welded structural parts with high quality requirements in construction and bridge engineering.

---