What is the comparison table of nominal diameter and outer diameter of seamless steel pipe?

The comparison table of nominal diameter and outer diameter of seamless steel pipe is as follows:

Generally speaking, the production process of seamless steel pipe can be divided into two types: cold rolling and hot rolling. The appearance of cold-rolled seamless steel tube is shorter than that of hot-rolled seamless steel tube, and the wall thickness of cold-rolled seamless steel tube is generally smaller than that of hot-rolled seamless steel tube, but the surface looks brighter than that of thick-walled seamless steel tube. The surface will not be too rough, and the caliber will not have too many burrs.

The maximum nominal diameter of cold-rolled pipe is 200 mm, and the maximum nominal diameter of heat pipe is 600 mm.

Extended data:

1, range This standard specifies the definition and series of DN (nominal size). This standard is applicable to piping components specified in relevant standards using DN identification. Note: Other marking methods different from this standard can also be adopted, such as thread, press fit, socket welding or butt welding. Pipe fittings can be marked with NPS (nominal pipe size), OD (outer diameter), ID (inner diameter) or G (pipe thread size marking).

2. Definition DN: used for the size identification of the combination of letters and numbers of piping system components. It consists of the letter DN followed by a dimensionless integer, which is directly related to the feature size, such as the aperture or outer diameter (in mm) of the port connector.

Note 1: Unless otherwise specified in relevant standards, the number after the letter DN does not represent the measured value and cannot be used for calculation purposes. Note 2: For standards adopting DN identification system, the relationship between DN and the size of pipeline components, such as DN/OD or DN/ID, should be given.

References:

Baidu encyclopedia-nominal diameter of steel pipe