Can Q345 replace Q235?
A: It has higher strength and can be replaced; however, it is more expensive and welding parameters need to be adjusted.
32. What are the corresponding grades for imported steel?
A: European standard S355JR/J0/J2; American standard A572Gr50; Japanese standard SM490.
33. What precautions should be taken when storing steel?
A: Protect from moisture and rust; elevate the steel off the ground to avoid rain; for long-term storage, regular rust removal and painting are necessary.
34. What are the key points for cutting and processing?
A: Flame cutting, plasma cutting, and laser cutting are all acceptable; thick plates need slow cooling after cutting to avoid cracking.
35. What are the most common pitfalls when purchasing steel?
A: Using Q345A to pass off as B/C (no impact); exceeding the negative tolerance for thickness; the warranty certificate does not match the actual product; misusing grade B for low-temperature projects.