The GB/T 8162-2018 standard specifies seamless steel tubes for general structural purposes. The 42CrMo alloy steel pipe under this standard offers high strength, good toughness, and excellent wear resistance. It is widely used in machinery, automotive, and engineering applications where high load-bearing capacity and durability are required. Heat treatment (quenching & tempering) enhances its mechanical properties, making it suitable for critical structural components.