How to choose between Q195 and Q235 in construction?
Choose Q195: Low load, non-load-bearing, requiring forming/welding, low-cost scenarios.
Choose Q235: Load-bearing structures, structural members, medium to high load scenarios.
What precautions should be taken when welding Q195 during construction?
The welding current should not be too high to avoid overheating; no preheating/post-heating is required, control welding deformation.
What are the anti-corrosion treatment requirements for Q195 components?
Outdoor/humid environments must be galvanized or painted; simple rust prevention treatment is sufficient for dry indoor environments.
What are the precautions for cold bending of Q195?
The cold bending radius should be ≥ 1.5 times the plate thickness to avoid over-bending and cracking; cold-rolled plates should be processed according to their hardness grade.
What are the connection methods for Q195 components?
Welding, bolt connection, riveting connection, and snap-fit connection are available. Welding is the most common, while bolt connection is convenient for assembly and disassembly.
What are the cost advantages of Q195?
It's 10%-15% cheaper than Q235 and 30%-50% cheaper than alloy steel, making it suitable for large-scale projects.
What are the usage specifications for Q195?
It complies with GB/T 700 "Carbon Structural Steel," and the design must conform to the "Steel Structure Design Standard" and the "Concrete Structure Design Code."
What are the common quality problems with Q195?
Insufficient strength, poor plasticity, surface corrosion, delamination, and weld cracks. Purchase only from reputable steel mills.
What are the application limitations of Q195?
It is strictly prohibited for use in load-bearing structures, high-stress components, alternating loads, highly corrosive environments, and high-temperature environments; it is only suitable for low-load, non-load-bearing applications requiring processing/welding.