st37.4 seamless steel pipes & tubes 1.Standard:DIN,ASTM,API,GOST8731 2.Grade:st35.4,st37,A53/A106/API 5L-B 3.Size:1/8 ... " * 3 ST37.4 seamless steel ... the special needs of customers. TYPEst37.4 seamless steel pipe (cold drawn steel pipe )StandardDIN17175,DIN1626,DIN2448,DIN17120,API 5L, API 5CT, ASTM A106, ASTM A53,ASTM ...