管和管 - BS3074NA13(管),ASTM B 163(冷凝器和热交换器管),ASTM B 165(无缝管和管),ASTM B 725(焊接管),ASTM B 730(焊接管),ASTM B 751(焊接管),ASTM B 775(焊接管),ASTM B 829(无缝管和管),ASME SB 163(冷凝器和热交换器管),ASME SB 165(无缝管和管),ASME SB 725(焊接管) ,ASME SB 730(焊接管),ASME SB 751(无缝和焊接管),ASME SB 775(无缝和焊接管),ASME SB 829(无缝管和管),SAE AMS 4574(无缝管),DIN 17751(管和管),VdTÜV263(板材,板材,棒材和管材),