What is Q235 steel?
Q235 is a national standard carbon structural steel. "Q" refers to yield strength, and "235" indicates a yield strength ≥ 235 MPa. Formerly known as A3 steel, it is the most commonly used foundation steel in construction.
What standards does Q235 conform to?
It conforms to GB/T 700-2006 "Carbon Structural Steel." Steel plates for building structures conform to GB/T 19879-2015.
What are the quality grades of Q235?
It is divided into four grades: A, B, C, and D, distinguished by low-temperature impact toughness and impurity content, with grade D being the best.
What is the core difference between Q235 and Q355?
Q235 is ordinary carbon steel (yield strength 235 MPa); Q355 is low-alloy high-strength steel (yield strength 355 MPa), with approximately 50% higher strength.
Why is Q235 widely used in construction?
It has moderate strength, good plasticity, excellent weldability, is easy to process, and has low cost, making it suitable for most conventional building structures.