... , ST52, ST54, 17Cr3, 20Cr4,CK10, CK22,CK45,C4 precision steel tube DIN2391tandard: GB/T3639 DIN2391Application:For mechanical structure, hydraulic installation, hydraulic ... (%)Tensile Strength(MPa)Elongation(%)Yield Point(MPa)≥1041063731033512335242052051054508430104102024535590455065208530173154564546305610760014355 precision steel tube DIN2391