Grade: Gr1 Gr2 Gr5 Gr7 Gr12 Standard: GB/T3624-1995, GB/T3625-1995 ASTM B337 ASTM B338 ASTM B861 ASTM B862 The way of processing: cold rolling, welding, annealed condition Size:5~10X1.0~.5X2000~1000Cold rolling, seamless 110X1.0~8X1000~2000 (Welding).