Domestic seamless steel pipe supplied according to chemical composition and mechanical properties, such as the chemical composition of No. 10, 15, 20, 25, 30, 35, 40, 45 and 50 steel, which should meet the requirements of GB/T699-88.

Accordance to GB/T8162-87, seamless pipe specifications: 

The outer diameter of the hot-rolled pipe is 32～630mm. The wall thickness is 2.5～75mm. 

The outer diameter of cold rolled (cold drawn) pipe is 5～200mm. The wall thickness is 2.5-12mm.

The weight calculation formula of seamless steel pipe is:

m=F×L×ρ

m—mass Kg; F—cross-sectional area m2/m; L—length m; ρ—density *Kg/m3

Note: F sectional area calculation method:

1. Square steel  F = a2

2. Steel pipe  F=3.1416×$(D-$)     D—diameter ＄—thickness

3. Steel plate and flat steel    F= a×$          a—width

Changsha Xiangjia Metal Materical Co., Ltd. the Steel Pipe Division of ADTO GROUP, is one of the leading manufacturers of steel products in China. We specializes in manufacturing all kinds of steel pipe in various grades and sizes. Years of production experience and manufacturing facilities who have a capacity of 200,000 tons per annual will ensure the good quality and competitive duration of our products.