Seamless steel tubes in large calibers for gas cylinders

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Posting date : Feb 26, 2008

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Standards： GBl8248 Chinese national standard ASTMA519 Standard of American Society of Testing Materials Application： Used as seamless steel tubes of large calibers for manufacturing gas cylinders Model No.of major steel tubes： 4130X Diamensional tolerances: Types of steel tubes Outer diameter Wall thickness Hot-rolled tubes Tube sizes(mm) Tolerances(mm) Tube sizes (mm) Tolerances(mm) φ559 ±1.0％ 17.0 －0％，＋25 Mechanical properties： Standard codes Models of steel tubes Tensite strength（MPa） Yield strength（MPa） Yield ration Elongation（％） Absorbed-in-fracture energy（J） Hardness Q/321088HGB3 4130X 725～865 485～735 ≤0.85 ≥20 －40℃≥40 195～269HB Chemical composition: Standard codes Models of steel tubes Chemical compositions（％） C Si Mn P S Cr Ni Cu Mo V Q/321088HGB3 4130X 0.25～0.35 0.15～0.35 0.40～0.90 ≤0.020 ≤0.010 0.80～1.10 ≤0.25 ≤0.20 0.15～0.25 ≤0.08 www.sunnysteel.com Tel.:+8621-3378 0199 Fax:+8621 5107 9722