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Description:SEAMLESS COLD DRAWN STEEL TUBE FOR HIGH PRESSUR GAS CYLINDER Grade: 1.7720 34CrMo4 Standard: DIN 17204 Chemical composition (%) Grade C Si Mn P S P+S Cr Mo Ni Cu 34CrMo4 0.30-0.40 0.15-0.35 0.50-0.80 <0.020 <0.010 <0.025 0.90-1.20 0.15-0.25 <0.40 -- Tolerance : OD tolerance: ±0.5 % WT tolerance: +15/-0 % Roundness: ±1 % Straightness: 2 mm/m Max Tensile properties Tensile Strength:>890 Mpa Yield Strength:>755 Mpa Elongation:>14% Impact strength:>60 J Conservation: outside oiled Package: bundle of steel strip, knitting strip package.