ASTM A53/A106/API 5L Carbon Steel Seamless Pipe 1.Standard ... grade of Steel Pipe: grade B , 20# , Q235 , ST 52 , ST374) Standards of Steel Pipe: ASTM A106 , ASTM 53 , API ... 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; X42,X46,X52,X60,J55,K55,N80; ...