Technical requirements of the national standard fluid seamless steel pipe

When selecting fluid seamless steel pipes, understanding the technical requirements is essential to ensure they meet industry standards and perform effectively in various applications. Below are the key technical requirements based on the national standard for fluid seamless steel pipes.

Chemical Composition:

The maximum allowable content of alloying elements in various steel grades is specified to ensure consistency and quality.

Geometric Dimensional Accuracy:

This includes tolerances for outer diameter, wall thickness, length, and the bending degree of fixed-length pipes. Diameter accuracy reflects the ovality, while wall thickness accuracy ensures uniformity throughout the pipe.

Surface Quality:

Standards define the internal and external surface conditions and the extent of allowable defects on the surface of fluid seamless steel pipes.

Physical and Chemical Properties:

Mechanical properties at room and elevated temperatures, along with corrosion resistance (e.g., oxidation, water erosion, and acid-alkali resistance), are outlined.

Process Performance:

The pipe's performance during processes like flattening, flaring, crimping, and welding is specified to ensure the material's versatility.

Metallographic Structure:

This includes both low-power and high-power structures to ensure the pipe’s strength and durability.

Special Requirements:

For fluid steel pipes intended for special applications, additional requirements may be outlined to meet specific operational needs.