Key equivalent grades include:
- International Standards:
- UNS S30908, EN 1.4833 (X12CrNi23-13), JIS SUS 309S, AISI 309S 12.
- Chemical Composition:
- Cr (22–24%), Ni (12–15%), C (≤0.08%), Mn (≤2.0%), Si (≤1.0%) 12.
- Low carbon content minimizes carbide precipitation, enhancing weldability and corrosion resistance 23.
2. Mechanical & Physical Properties
309S stainless steel combines high-temperature strength with corrosion resistance:
- Mechanical Properties:
- Tensile Strength: ≥515 MPa
- Yield Strength: ≥205 MPa
- Hardness: HB 201 (max) 35.
- Physical Properties:
- Density: 7.9 g/cm³
- Melting Point: 1400–1450°C
- Thermal Conductivity: 15.0 W/m·K (100°C) 34.
3. Manufacturing Standards & Nut Types
309S nuts comply with international standards for extreme environments:
- Key Standards:
- GB/T 3098.15-2023 (Stainless Steel Nuts)
- ASTM A276/A276M (Stainless Steel Bars)
- ISO 3506 (Corrosion-Resistant Fasteners) 56.
- Compatible Nut Variants:
- Hex Nuts (M6–M64)
- Flange Nuts
- Lock Nuts (self-locking designs)
- High-Temperature Anchor Nuts 67.
4. Key Applications
309S nuts excel in industries requiring resistance to oxidation and thermal cycling:
- High-Temperature Equipment:
- Furnace components (e.g., heat exchanger bolts, kiln liners)
- Boiler and combustion system fasteners 34.
- Chemical & Petrochemical:
- Acid-resistant reactor vessel hardware
- Pipeline fasteners in corrosive environments 23.
- Food Processing:
- Heat-resistant equipment for food-grade applications 34.
- Energy Sector:
- Power plant turbine fasteners and exhaust system hardware 34.
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- “309S Stainless Steel Nut Supplier”
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- “ASTM A276 309S Hex Nuts”
- “Corrosion-Resistant Industrial Nuts”
- “Food-Grade 309S Lock Nuts”
Performance Advantages
- High-Temperature Stability: Retains strength up to 980°C due to Cr/Ni-rich oxide layer formation 34.
- Corrosion Resistance: Resists oxidation, sulfidation, and acidic environments (e.g., sulfuric acid, acetic acid) 23.
- Non-Magnetic: Suitable for sensitive electronic and medical equipment 3.
Data Table: 309S Key Properties
| Property | Value | Source |
| Tensile Strength | ≥515 MPa | 56 |
| Max Operating Temp | 980°C | 34 |
| Thermal Conductivity | 15.0 W/m·K (100°C) | 4 |
| Chromium Content | 22–24% | 12 |
Why Choose 309S Stainless Steel Nuts?
Ideal for extreme thermal and corrosive environments, 309S nuts ensure durability in applications ranging from industrial furnaces to food processing systems. Their combination of high-temperature strength and oxidation resistance makes them indispensable for critical infrastructure 34.
309S stainless steel nuts, UNS S30908 fasteners, high-temperature industrial hardware, corrosion-resistant hex nuts, food-grade stainless steel nuts.
