Steel seamless gas cylinder is made of steel billet as raw material, by stamping and drawing, or by seamless steel pipe as material, by hot spinning closing bottom of the cylinder.The cylinder material is the calm steel smelted by alkaline open furnace, electric furnace or oxygen blowing alkaline converter，such as high quality carbon steel, manganese steel, chromium molybdenum steel or other alloy steel.Used to contain long-term gas (compressed gas) and high-pressure liquefied gas.