37Mn Seamless Steel Tube For Gas Cylinder Pipe Steel gas cylinders are manufacturing special steel cylinders. Requirements are usually smaller carbon content, strictly control the sulphur and phosphorus contents, meet the strength at the same time, good toughness and impact energy. 100% non-destructive testing. The seamless tubes shall be used for the manufacturing of refillable seamless steel quench & tempered gas cylinder with actual maximum tensile strength less than 950Mpa. Since the gas cylinders are manufactured by hot spinning process the steel grade used shall be compatible for the manufacturing of high pressure gas cylinders.   OD: Φ50-325mm WT:  3-55mm Tolerance of OD: ±0.75% Tolerance of Wall thickness: -10%——+12.5% Roundness of the inner and outer diameters: 80% of the tolerance of the outer diameter is not exceeded. The inclination of the end face: ≤2mm. Straightness: 1mm/1m. Surface quality: no cracks, folds, folds, delamination and stuttering.   Chemical Composition:

ELEMENT	C	Si	Mn	p	S	P+S	Al	Ni	Cu
Min	0.32	0.20	1.40	—	—	—	0.035	—	—
Max	0.38	0.30	1.70	0.02	0.01	0.025	0.060	0.15	0.30

  Mechanical properties: Tensile strength (MPa)≥750 Yield strength (MPa)≥630 Elongation (%)≥16