What is the international equivalent?
A:
US: ASTM A36
Europe: EN S235JR (S235J0/S235J2 for C/D)
Japan: JIS SS400
17. What are main applications?
A:
Construction: steel structures, bridges, building frames
Machinery: bases, supports, non-critical parts
Vehicles: chassis, general components
Shipbuilding: non-hull structural parts
18. Why is Q235 so widely used?
A: Good balance of strength, ductility, weldability; low cost; easily available.
19. What is the old name for Q235?
A: Previously known as A3 steel (reclassified in GB 700-88).
20. What is the difference between Q235 and Q355?
A: Q235: yield 235 MPa, mild steel. Q355: yield 355 MPa, high-strength low-alloy (HSLA) steel.