Grade: gr1 gr2 gr3 gr7 gr9: gr12 gr16 gr17; Ta1 ta2 ta3 ta7 ta9 ta12 ta16 ta17 Size (mm ): outer diameter of 0.8 ~ 420; wall thickness: 0.1 ~ 16; the maximum length: 18000mm ( diameter 6-76 mm ); Standard: astmb338, asme sb338, astmb37, astm b861, gb/t3624, gb/t3625 etc. Wooden box