... steel hollow pipe 1) Standard:API 5L,ASTM 36.10M,A106,A53,DIN 1629,1626,BS,JIS.etc mild steel hollow pipe1) Standard:API ... BS,JIS.etc2) Material: ASTM A106/A53,ST37,35, API 5L GR. B /X42/X52.etc3) Size: OD 1 ... SSAW,7) Surface treatment:bare,black painting,anti rust oil,hot dipped galvanized,3pe,etc8) Length: 5.8 meters ... ,power,shipbuilding,boiler,construction,,metallurgy,etc mild steel hollow pipe