309 Stainless Steel Wire Mesh
309 Stainless Steel Wire Mesh (UNS S30900) is an high-temperature austenitic stainless steel weaved mesh known for its excellent high-temperature oxidation resistance, which is formulated with high Cr-Ni (22–24% Cr, 12–15% Ni) content, designed for extreme thermal/oxidizing conditions, while being distinct from its low-carbon variant 309S (S30908/1.4833).
Typical Chemical Composition:
Grade | Chromium (Cr) | Nickel (Ni) | Carbon (C) | Manganese (Mn) | Silicon (Si) | Iron (Fe) |
309 | 22.0 – 24.0% | 12.0 – 15.0% | ≤ 0.08% | ≤ 2.0% | ≤ 1.0% | Balance |
Standards: UNS S30900, EN 1.4828, ASTM A580 (wire), ASTM A276 (bar), ASTM A479 (sheet);
Core Mechanical & Performance Advantages
· Mechanical Properties (Annealed, Room Temp):
Tensile strength ≥515 MPa;
Yield strength (0.2% offset) ≥205 MPa;
Elongation (δ5) ≥40%;
Non-magnetic (annealed; slightly magnetic after cold working);
Not hardenable by heat treatment (anneal at 1140–1175°C, water quench recommended).
· Oxidation & Corrosion Performance:
Excellent high-temp oxidation and thermal fatigue resistance; Superior to 304/316L in oxidizing acids (concentrated nitric acid); Limited resistance to reducing acids (HCl) and high-chloride aqueous solutions (inferior to 904L); 309 has higher carbon for better high-temp strength but requires passivation after welding in corrosive service.
· Processability:
Good weldability (use ER309/ER309L filler metal); Formable, deep-drawable; Machining needs sharp tools and proper cooling to avoid work hardening.
Common Applications
· Furnace Parts: Conveyor belts, muffles, and radiant tubes in furnaces operating below 1100°C.
· Annealing Covers: Mesh for gas burn-off in bright annealing processes.
· Kiln Screens: Filtration of hot powders (e.g., cement, ceramics) during cooling or processing.
· Automotive: Exhaust system gaskets and particulate supports (in after-treatment components).
· Thermal Oxidizers: Flame arrestor media where heat resistance is critical.
