Carbon seamless steel pipe surface roughness standard

Carbon steel seamless steel pipe (CS SMLS pipe) is manufactured through cold drawing (extrusion) and hot rolling processes. These pipes do not require welding, offering good surface flatness and high dimensional accuracy in both inner and outer diameters. They can withstand high pressure and are widely used in petroleum, chemical, aviation, and light industry sectors.

Surface Roughness Standard

The surface roughness of carbon seamless steel pipes indicates the degree of minute unevenness on the pipe's surface. This roughness is closely related to the pipe's corrosion resistance, lubricity, appearance, and adhesion. Generally, the surface roughness of industrial carbon seamless steel pipes ranges between 1.6-3.2μm. The specific roughness size must be determined based on actual use requirements and national standards. High surface hardness applications, such as aerospace, automotive, and machinery manufacturing, often demand stricter surface roughness standards.

Surface Roughness Standards for Carbon Seamless Steel Pipes

Round Precision Steel Pipes: Ra≤1.6μm

Cold-Drawn Steel Pipes: Ra≤6.3μm

Hot-Rolled Steel Pipes: Ra≤12.5μm

Production Standards

Carbon seamless steel pipes are produced according to various standards, including ASTM (American Society for Testing and Materials), DIN (German Industrial Standards), and JIS (Japanese Industrial Standards). Each standard has different requirements for surface roughness, and production must adhere to the appropriate standard.

Factors Affecting Surface Roughness

Production Process: The method used, whether cold drawing, hot rolling, or cold rolling, significantly influences the surface roughness.

Steel Pipe Material: Different steel grades result in varying surface roughness, even with the same production process.

Surface Treatment: Treatment methods such as polishing, sandblasting, and electroplating also affect the roughness.

Precautions for Use

When using carbon seamless steel pipes, consider the following:

Select pipes that comply with national standards.

For applications requiring high surface roughness, choose pipes with smaller roughness.

Avoid mechanical damage and chemical corrosion.

Surface roughness is a crucial indicator of the quality and performance of carbon steel seamless steel pipes. Manufacturers must strictly control surface roughness to ensure product quality meets standard requirements. Buyers should determine the specific roughness needed based on different standards and requirements to ensure the pipe's effectiveness and longevity.