... : Carbon Steel Pipes2)Size: 1/2"-48"3)Standard: ASTM,DIN,JIS GBCARBON STEEL SEAMLESS PIPES:1) Pipe Diameter of ... , 20# , Q235 , ST 52 , ST374) Standards of Steel Pipe: ASTM A106 , ASTM 53 , API 5L and etc.5) Surface of Steel Pipe ... )StandardDIN17175,DIN1626,DIN2448,DIN17120,API 5L, API 5CT, ASTM A106, ASTM A53,ASTM A179,ASTM A210,ASTM A36,JISG3454,JISG3455,JISG3556,GOST8732,GOST8731MaterialGr. B, Gr. C ...