2. Material Properties of Alloy31
Alloy31 combines exceptional corrosion resistance with high mechanical strength:
- Chemical Composition:
- Ni: 30–32%, Cr: 26–28%, Mo: 6–7%, Cu: 1.0–1.4%, N: 0.15–0.25% 15.
- Mechanical Properties:
- Tensile Strength: ≥650 MPa
- Yield Strength: ≥295 MPa
- Elongation: ≥35%
- Hardness: 200–350 HB 45.
- Key Advantages:
- Extreme Corrosion Resistance: PREn (Pitting Resistance Equivalent) >40, resistant to sulfuric acid, hydrochloric acid, phosphoric acid, and chloride-rich environments 13.
- High-Temperature Stability: Maintains strength up to 400°C, suitable for heat exchangers and pressure vessels 47.
- Weldability & Formability: Compatible with TIG, MIG, and plasma welding using filler metals like Alloy C-276 57.
3. Standards for Alloy31 Nuts
Alloy31 nuts comply with stringent international specifications:
- Material Standards:
- ASTM B625: Plate, sheet, and strip requirements 24.
- EN 10088-3: Technical delivery conditions 47.
- Mechanical Performance Standards:
- ASTM A193 B8M: High-strength fasteners for corrosive environments 46.
- ASTM A320 L7: Low-temperature applications (e.g., LNG systems)
4. Types of Nuts Produced with Alloy31
Alloy31 is ideal for manufacturing high-performance nuts in critical industries:
- Hex Nuts: General-purpose fasteners for chemical reactors and offshore platforms 17.
- Flange Nuts: Sealing solutions for pipelines in sulfuric acid processing plants 46.
- Lock Nuts: Vibration-resistant designs for turbomachinery and marine engines 37.
- Heavy Hex Nuts: Structural connections in flue gas desulfurization (FGD) systems 47.
5. Applications of Alloy31 Nuts
Key Industries:
- Chemical & Petrochemical: Acid storage tanks, heat exchangers, and sulfur recovery units 14.
- Oil & Gas: Subsea wellheads, sour gas processing equipment, and Christmas trees 67.
- Marine Engineering: Seawater desalination systems and hydraulic pipelines 47.
- Power Generation: Geothermal energy plants and coal-fired FGD systems 56.
- Primary: Alloy31 Stainless Steel Nuts, UNS N08031 Hastelloy Nuts, ASTM B625 Hex Nuts
- Secondary: Corrosion-Resistant Flange Nuts, High-Temperature Lock Nuts, Super Austenitic Nuts Price
- Long-Tail: Alloy31 nuts for sulfuric acid plants, N08031 vs 316L nuts comparison, Hastelloy nuts for offshore platforms
Visual Content (Performance Comparison Table)
| Property | Alloy31 | 316L | Alloy 625 | |
| Tensile Strength (MPa) | 650 | 515 | 930 | |
| Corrosion Resistance (PREn) | >40 | 26–32 | >50 | |
| Max Operating Temp (°C) | 400 | 250 | 540 | 45 |
Image Suggestion:
- Alloy31 Hex Nuts in Chemical Processing Equipment”
Internal & External Linking Strategy
- Internal Links:
- “Explore our Alloy31 flange nuts for sulfuric acid pipelines.”
- “Compare Alloy31 vs 625 nuts for high-temperature applications.”
- External Links:
- ASTM Standards: ASTM B625
- Material Datasheet: Hastelloy Alloy31 Guide
