Standards for Inner And Outer Diameter Dimensions of Seamless Steel Pipes

International standards

In international standards, the inner and outer diameter dimensions of seamless steel pipe generally adopt ISO standards. Its common inner diameter dimensions range from 6mm to 600mm, the outer diameter dimensions range from 16mm to 1350mm, and the wall thickness is generally between 1.5mm and 60mm.

Japanese standards

The Japanese standard JIS adopts a standard called "DN specification", which marks the pipe size by the number of millimeters of the inner diameter of the pipe. Accordingly, it is suitable for pipes with a nominal diameter of 1/4 inch to 24 inches, and its wall thickness series generally include: XS, STP, ETP, SCH10, SCH20, SCH30, SCH40, SCH60, SCH80, SCH100, SCH120, SCH140, SCH160, STD, SCHXS, SCHXXS, etc.

European standards

The European standard EN commonly uses nominal outer diameter dimensions, and the corresponding wall thickness, inner diameter and other specification series are also different. Common wall thicknesses include: S, XS, XXS, STD, ET, etc. European standards are generally applicable to seamless steel pipes and welded steel pipes.

American standards

The American standards ASME and ASTM commonly use nominal sizes, and the outer diameter specifications of pipes are generally between 1/8 inches and 120 inches. The wall thickness series include: STD, XS, XXS, SCH5, SCH10, SCH20, SCH30, SCH40, SCH60, SCH80, SCH100, SCH120, SCH140, SCH160, SCHXXS, etc.

Standard comparison and analysis

There are certain differences in the inner and outer diameter size specifications of seamless steel pipes in various countries and regions, including nominal sizes, wall thickness series, inner diameter specifications, etc. Therefore, in practical applications, it is necessary to select appropriate standards according to specific occasions and make specification conversions.

Among international standards, the advantages of using ISO standards are good standardization, strong versatility, and wide range of use, but the disadvantage is that the specifications are too complicated and difficult to understand and apply. The Japanese standard JIS uses the inner diameter specification of millimeters, which is more suitable for the production and use of small-diameter pipe fittings. European and American standards pay more attention to the standardization and uniformity of nominal sizes, which are suitable for the production and use of large-diameter steel pipes.

Summary

In short, when choosing the inner and outer diameter size specification standards of seamless steel pipes, it is necessary to consider the specific occasions and requirements, select according to the actual situation, and make conversions and comparisons.

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