Q: What are the common application scenarios of Q355 coil?
A: Building steel structures, bridges, construction machinery, vehicle manufacturing, pressure vessels, pipe supports, wind power towers, containers, etc.
Q: What is the application difference between Q355C coil and Q355D coil?
A: Q355C is suitable for normal temperature working conditions above 0℃ (such as workshops, equipment supports); Q355D is suitable for cold regions above -20℃ (such as northern bridges, outdoor towers).
Q: Can Q355 coil be used for pressure vessels?
A: Q355D/E that meets GB 150 and has passed flaw detection, heat treatment and third-party inspection can be used for medium and low pressure vessels, and the material shall be selected according to the design specifications.
Q: What are the factory inspection items of Q355 coil?
A: Chemical composition, mechanical properties (yield strength/tensile strength/elongation), impact test, cold bending test, dimensional shape, surface quality, and ultrasonic flaw detection if necessary.
Q: What is the ultrasonic flaw detection grade of Q355 coil?
A: According to the contract, the common grades are Grade I or II of GB/T 2970, which are used to detect internal defects.