... of customers. TYPEst37.4 seamless steel pipe (cold drawn steel pipe )StandardDIN17175,DIN1626,DIN2448,DIN17120,API 5L, API 5CT, ASTM A106, ASTM A53,ASTM A179 ... ,JISG3455,JISG3556,GOST8732,GOST8731MaterialGr. B, Gr. C; X42,X46,X52,X60,J55,K55,N80; st37,st42,st42-2,st45.8,st52,Gr 20 ...