Pipe roughness, mechanical terms. In mechanics, roughness refers to the micro-geometric characteristics of small pitches and peaks and valleys on the processed surface.

Seamless steel pipes are rolled with solid pipe blanks after piercing. 1. Manufacturing method: According to different production methods, it can be divided into hot rolled tube, cold rolled tube, cold drawn tube, extruded tube, etc. a. Hot rolled seamless tubes are generally produced on automatic tube rolling units. After inspection and removal of surface defects, the solid tube billet is cut t...

Welding procedure：round tube billet → heating → perforation → three-roller cross-rolling,  continuous rolling or extrusion → tube removal → sizing (or reduced diameter) → cooling → straightening → hydraulic test (or flaw detection) → marking. 

Working pressure refers to the pressure of pipes, fittings, valves, etc. under normal operating conditions.

Take the seamless steel pipe as an example, pipe wall thickness tolerance affect the quality. Pay attention to this, you will get a better pipe.

The pressure rating of the pipeline includes two parts: The nominal pressure level of standard fittings expressed in nominal pressure; The wall thickness grade of standard pipe fittings expressed in wall thickness grade.