Roughness of carbon welded steel pipe

The roughness of carbon welded steel pipes is determined by the smoothness of their surface. Common roughness measurements include Ra, Rz, and Rmax, typically ranging from Ra 1.6 to 6.3 microns.

Concept and Measurement Method of Carbon Welded Steel Pipe:

The roughness of carbon welded steel pipes refers to the surface irregularity and texture density. It directly impacts the overall surface quality and service life of the pipe. Roughness is measured by evaluating the geometric deviations between the pipe surface and a reference plane. Common roughness evaluation metrics include Ra, Rz, and Rmax.

Common Roughness Metrics for Carbon Steel Pipes:

Ra Value:

The Ra value represents the arithmetic mean of surface deviations from the mean line.

Expressed in microns (μm), Ra is a non-directional comprehensive surface roughness indicator.

It is calculated by averaging the absolute distances between all surface points and the reference plane.

Typical Ra values for carbon steel pipes range from 1.6 to 6.3 μm.

Rz Value:

The Rz value measures the average height difference between the five highest peaks and the five lowest valleys along a length of the pipe.

Expressed in microns, Rz reflects the longitudinal surface irregularities.

Typical Rz values for carbon steel pipes range from 10 to 50 μm.

Rmax Value:

The Rmax value indicates the maximum depth of the groove between the highest peak and the deepest valley over a short section of the pipe surface.

It considers only the largest local irregularities and is a non-directional metric.

Typical Rmax values for carbon steel pipes range from 20 to 200 μm.

Conclusion:

The roughness of carbon welded steel pipes is a critical indicator of surface quality. Generally, a smoother pipe surface with lower roughness values correlates with a longer service life. Proper measurement and control of surface roughness ensure the durability and performance of the pipes in their applications.