What defects are common?
A: Surface scale, scratches, slight pitting, dimensional deviations.
How to check quality?
A: Check material certificate, perform mechanical tests, inspect dimensions and surface.
Can Q235 be used for pressure vessels?
A: Only for low-pressure, non-corrosive small vessels; not for high-pressure service.
What is the difference between Q235 and Q355?
A: Q355 has higher yield strength (≥355 MPa) and is stronger than Q235.
Can Q235 be galvanized?
A: Yes, hot-dip galvanizing is widely used for corrosion protection.