Q: What is Q345 steel?
A: Q345 is a national standard low-alloy high-strength structural steel with a yield strength of 345MPa. It has good comprehensive mechanical properties, high toughness, and is easy to weld.
Q: What is the difference between Q345 and ordinary Q235?
A: Q345 has significantly better strength, toughness, low-temperature resistance, and load-bearing capacity than Q235, making it suitable for heavy-duty and large structures. Q235 is mostly used for ordinary light components.
Q: What are the common sub-grades of Q345?
A: It is divided into Q345B, Q345C, Q345D, and Q345E. The main difference is that the low-temperature impact temperature decreases progressively.
Q: What are the main forms of Q345 steel?
A: Steel plates, steel coils, channel steel, I-beams, H-beams, angle steel, seamless steel pipes, welded pipes, profiles, medium and heavy plates, etc.
Q: What is the biggest advantage of Q345?
A: It has high strength, high cost performance, good weldability, better corrosion resistance than ordinary carbon steel, and excellent cold and hot working performance.