The Q390 structural pipe conforming to GB/T 8162 is a high-strength seamless steel tube primarily used in construction, machinery, and load-bearing structures. With a minimum yield strength of 390 MPa, it offers excellent weldability and impact toughness. This standard ensures dimensional accuracy, mechanical performance, and suitability for cold bending or welding applications. Common in bridges, buildings, and industrial frameworks, Q390 pipes provide durability under heavy loads and harsh conditions.