Material Data & Key Features
309S stainless steel round bar is a high-alloy austenitic stainless steel renowned for its exceptional high-temperature resistance and corrosion performance.
- Chemical Composition:
- Cr (22.00-24.00%), Ni (12.00-15.00%), C (≤0.08%), with low sulfur content for improved weldability13.
- Balanced Si (≤1.00%), Mn (≤2.00%) ensure structural stability1.
- Mechanical Properties:
- Tensile Strength: ≥520 MPa | Yield Strength: ≥205 MPa | Elongation: ≥40%12.
- Hardness: ≤187 HBW, ideal for machining and forming16.
- Thermal Stability: Maintains integrity up to 800°C, with minimal thermal expansion and creep23.
Superior Processing Performance
309S round bars offer unmatched versatility in manufacturing:
- Machining: Compatible with laser/plasma cutting and cold/hot forming (900–1100°C)4.
- Welding: Low carbon content reduces weld decay; TIG/MIG recommended with AWS E309L-16 filler34.
- Heat Treatment: Solution annealing at 1040–1100°C followed by rapid cooling optimizes corrosion resistance24.
Wide-Ranging Applications
309S excels in extreme environments across industries:
High-Temperature Equipment:
- Furnace components (radiant tubes, heat exchangers), kiln fixtures23.
Chemical & Petrochemical:
- Catalyst recovery systems, acid/alkali-resistant reactors35.
Energy Sector:
- Nuclear/thermal power plants, fuel cell stacks23.
Specialized Fabrication:
- Welding electrodes, precision tools requiring smooth finishes
