factory direct sale full composition qualified mechanical properties nice surface condition nice machinability AISI 321 Stainless Steel Seamless Round Pipe 1. Composition(%): C:0.08max, Mn:2.00max, P:0.045max, S:0.030max, Si:1.00max,Cr:17.00-19.00, Ni:9.00-12.00, Ti: 5*C-0.7 2. Size: OD: 4MM-426MM Thickness: 1MM-20MM 3. Length: Random Length, Cutting Length (standard length), Multiple Length 4. ...