Q: What is the weldability of Q235 plate? Can it be welded by common welding methods?
A: It has excellent weldability. Plates with thickness ≤30mm require no preheating at room temperature, and can be welded by arc welding, gas welding, resistance welding and other common methods, with stable performance of welding joints.
Q: Can Q235 plate be cold-formed? What are the key points of cold forming?
A: It has good cold formability and can undergo cold forming processes such as bending, rolling and stamping. The key point is to control the bending radius (not less than 1.5 times the plate thickness for thick plates) to avoid cracking at the bending part.
Q: Can the strength of Q235 plate be improved by heat treatment?
A: Q235 is low-carbon steel, and quenching and tempering have a very limited effect on strength improvement. Heat treatment is also likely to cause deformation and cracking. It is generally used in as-rolled or normalized state without additional strength heat treatment.
Q: What is the hardness range of Q235 plate in as-rolled state?
A: The Brinell hardness (HB) is generally 120-180. Its low hardness makes it easy for cutting and processing, suitable for various mechanical processing operations.
Q: What is the tensile strength range of Q235 plate?
A: The tensile strength is 375-500MPa, which can meet the tensile load requirements of general low-stress structural parts such as building frames and mechanical brackets.