309/309S Stainless Steel Round Bar

309/309S Stainless Steel Round Bar – Premium Product Introduction       Grade & Chemistry   AISI 309/309S is a heat-resisting austenitic stainless steel containing 22–24 % Cr and 12–15 % Ni. The high chromium level forms a tightly-adherent oxide scale that resists oxidation up to 1 038 °C in continuous service and 1 100 °C intermittent. Grade 309S limits carbon to ≤0.08 %, eliminating carbide precipitation during welding and removing the need for post-weld annealing .   Production Range   - Standards: ASTM A276 / A479, ASME SA276 / SA479, EN 10088-3, JIS G4303   - Diameter: 6 mm – 300 mm (0.236" – 12") hot-rolled, peeled or centreless-ground   - Length: 1 – 6 m random; h6, h9, K12 tolerances on request   - Surface: black, pickled, bright-peeled, ground (Ra ≤ 0.4 µm) or polished 600 grit   - Test certificates: EN 10204 3.1/3.2, NACE MR0175 compliance available   Key Properties (annealed)   - Tensile ≥ 620 MPa, Yield ≥ 310 MPa, Elongation ≥ 45 %, HRB ≤ 85    - Non-magnetic; mainta…