API 5L X70 boiler seamless steel pipe 1) Standard:API 5L,ASTM 36.10M,A106,A53,DIN 1629,1626,BS,JIS.etc API 5L X70 boiler seamless steel pipe1) Standard:API 5L,ASTM ... 36.10M,A106,A53,DIN 1629,1626,BS,JIS.etc2) Material: ASTM A106/A53,ST37,35, API 5L ... :petroleum,gas,chemical,power,shipbuilding,boiler,construction,,metallurgy,etc API 5L X70 boiler seamless steel pipe