... 1629,1626,BS,JIS.etc API 5L X70 boiler seamless steel pipe1) Standard:API 5L,ASTM 36.10M,A106, ... BS,JIS.etc2) Material: ASTM A106/A53,ST37,35, API 5L GR. B /X42/X52.etc3) Size: OD 1 ... Technique:Hot Rolled,Cold Drawn,Seamless,ERW,LSAW,SSAW,7) Surface treatment:bare,black painting,anti rust oil,hot ... ,gas,chemical,power,shipbuilding,boiler,construction,,metallurgy,etc API 5L X70 boiler seamless steel pipe