... 1,we ues the first grade material in China. 2,advanced testing equipment. 3,competitive price . stainless steel pipe 3091.ASTM,DIN ... :0.5-60mmO.D:3/8",1/2",3/4",1",1 1/4",1 1/2",2",2 1/2",3",3 1/2",4",5",6",8",10",12",14 ... .102. Surface finish: pickling, annealing, manual polish and mechanical polish;3. Technical: cold rolled,cold drawn,hot rolled.4. Chemical and ...