Quality requirements for seamless steel pipes

1. Chemical composition requirements

The chemical composition of seamless steel pipe is an important factor affecting its performance. The contents of various elements should meet corresponding standards, mainly including C, Si, Mn, S, P and other elements. Among them, the carbon content should be moderate. If it is too low, it will affect the strength of the material, and if it is too high, it will increase the brittleness of the material.

2. Mechanical performance requirements

The mechanical properties of seamless steel pipes are important indicators to measure their quality, including tensile strength, yield strength, elongation, etc. These performance indicators need to comply with national standards or customer requirements to ensure that seamless steel pipes have sufficient strength and reliability in use.

3. Specification and size requirements

The specifications and dimensions of seamless steel pipes should comply with relevant standards or customer requirements, including outer diameter, wall thickness, length, etc. Manufacturers should ensure that the dimensional accuracy of seamless pipes is within the allowable range to meet usage requirements.

4. Surface quality requirements

Surface quality directly affects its service life and appearance. Manufacturers should ensure that the surface of seamless pipes is smooth, free of cracks, pores and other defects, and can be rust-proofed according to customer requirements.

5. Manufacturing process requirements

Including piercing, rolling, heat treatment, straightening, cutting and other processes. During the manufacturing process, the process parameters of each process should be strictly controlled to ensure the quality and performance of the steel pipe.

6. Testing requirements

Strict testing should be carried out before leaving the factory, including chemical composition analysis, mechanical performance testing, dimensional measurement, surface quality inspection, etc. Only seamless steel pipes that pass the test can be sold and used out of the factory.