Q345 S355jr Carbon Equal Angle Steel Galvanized L Shape Mild Steel Angle

1.What is Q235 steel?
A: Q235 is a common carbon structural steel (mild steel) in China, defined by GB/T 700-2006. "Q" = yield strength; "235" = minimum yield strength of 235 MPa (for thickness ≤16mm). Formerly known as A3 steel.
2. What are the grades of Q235?
A: Four grades (A/B/C/D), differing in impact toughness and impurity limits.
3. What does Q235A mean?
A: Grade A: No impact test required; highest S/P limits (S≤0.050%, P≤0.045%); for non-critical, non-welded parts.
4. What does Q235B mean?
A: Grade B: 20°C impact test (≥27J); S≤0.045%, P≤0.045%; most common grade for general structures.
5. What does Q235C mean?
A: Grade C: 0°C impact test (≥27J); lower S/P (S≤0.040%, P≤0.040%); for outdoor structures, cold environments.