Standard:

ASTM B381, ASME SB381, AMS,MIL, DIN, BS, JIS, GB/T, ISO,etc.

Grade:

GR1, GR2, GR3, GR4, GR5, GR6, GR7, GR9, GR11, GR12, GR23,

Size:

Φ(50-1300)×L(max length 1500mm)