What is Q235 steel?
A: Q235 is ordinary carbon structural steel. Q represents yield strength, and 235 indicates a standard yield strength value ≥235MPa (thickness ≤16mm). It was formerly known as A3 steel.
What are the quality grades of Q235?
A: It is divided into four grades: A/B/C/D. The difference lies in the impact temperature and impurity content:
A: No impact testing, used for static load structures.
B: 20℃ impact test, most commonly used in construction.
C: 0℃ impact test, low-temperature environment.
D: -20℃ impact test, important structures in cold regions.
What are the main chemical components of Q235?
A: It falls under the category of low-carbon steel, C≤0.22%, contains Mn and Si, low S and P, ensuring good weldability and plasticity.
What are the core mechanical properties of Q235 (t≤16mm)? A: Yield strength ≥235MPa, tensile strength 375-500MPa, elongation ≥26%, cold bending 180° is acceptable.
Why is Q235 the most commonly used in construction?
A: Moderate strength, good plasticity and toughness, easy to weld/cold bend, low cost, mature standards, and wide application.