The Japanese standard JIS G3429 specified seamless steel tubes used for the manufacture of seamless steel gas cylinders. JIS 3429 tubes shall be classified into 5 grades, Grade STH21 tubing is a medium and low carbon chromium-molybdenum type used for pressure vessel made by seamless manufacturing methods. The service environment of high pressure gas cylinders put forward higher requirements for the performance of the steel tube, material STH21 is more widely used as a cylinder material in high load working environment due to its high strength at high temperature and excellent creep strength.
Standards: JIS G3429
Outer Dimensions: 19.05mm - 114.3mm
Wall Thickness: 2.0mm~40.0mm
Length: 5.8- 16000mm
Wall thickness disparity
Within 20% of the nominal wall thickness
JIS 3429 standards specified seamless steel tubes to be used the high pressure gas cylinder manufacturing specified in JIS B8320 and JIS B8241. We can manufacture the following grade of seamless steel pipe for gas cylinder: STH11, STH12, STH21, STH22, or other else grades. World iron&steel is a professional supplier and vendor of alloy steel tubing and piping. We manufacture and distribute high quality STH21 steel round tubing for cylinder application in accordance with JIS G3429 standards, specified delivery conditions and final customer specifications for industrial and commercial applications. Special sizes and delivery issues can be further negotiated and we provide a wide range of solutions for purchasing departments to select alternative grades, contact us today!