Precision seamless steel tube: differences between alloy and hot rolling

Seamless steel pipe production enjoys a high reputation in the market, especially for 20 * 2 precision pipes. The production process of precision tubes includes hot rolling, cold drawing, and precision rolling annealing. Each process has its unique advantages and application scenarios.

Alloy seamless steel pipe: superior to ordinary hot-rolled seamless steel pipe

Alloy seamless steel pipes are favoured for their high mechanical properties and hardness. Compared with ordinary hot-rolled seamless steel pipes, alloy seamless steel pipes have higher hardness, high temperature resistance, low temperature resistance, and corrosion resistance, making them excellent in various industrial applications.

45 # Hot rolled seamless steel pipe: challenges of quenching and tempering processing and welding

The hardness of 45 # hot-rolled seamless steel pipe is stronger than that of 20 # steel pipe, and it can be subjected to quenching and tempering processing. However, its welding requirements are relatively high, requiring special processes and techniques.

Seamless steel pipes for structures: GB/T8162 standard

Seamless steel pipes for structural use are mainly used for general mechanical processing, with representative materials including 20 #, 45 #, Q345B, 40Cr, 35CrMo, 45CrMo, etc.

Seamless steel pipes for fluids: GB/T8163 standard

Seamless steel pipes for fluids are mainly used for transporting fluid pipelines, with representative materials such as 20 # and Q345B.

Common materials of alloy steel pipesThe common materials for alloy steel pipes include Q345B, 42CrMo, 35CrMo, 27SiMn, 40Cr, 12Cr1MoV, 15CrMo, P91, T91, P22, etc.

Production process of seamless steel pipe

The production process of hot-rolled seamless steel pipes includes steps such as round steel cutting, heating, perforation, sizing, room temperature cooling, straightening, size testing, and sample analysis.The production process of cold drawn seamless steel pipes includes steps such as round steel perforation, tube blank formation, acid pickling and saponification, cold drawing process, size inspection, and sample analysis.The production process of precision rolled annealed seamless steel pipes includes steps such as round steel perforation, billet formation, acid pickling and saponification, precision rolling process, precision tube annealing treatment, size detection, and sample analysis.

The difference between 16Mn seamless pipe and Q345B seamless pipe

16Mn seamless pipe, now known as Q345B seamless pipe, represents a carbon content of approximately 0.16% in steel. 16Mn seamless steel pipe belongs to the low-alloy steel plate series due to its low carbon content, and is one of the common materials.