Corrosion Resistance
- Exceptional resistance to wet chlorine, oxidizing chlorides, sulfuric acid, and hydrochloric acid at low-to-moderate temperatures 12.
- Resists pitting, crevice corrosion, and stress corrosion cracking (SCC) in chloride-rich environments 12.
Mechanical Properties
- Tensile Strength: ≥690 MPa | Yield Strength: ≥283 MPa | Elongation: ≥40% 12.
- Density: 8.89 g/cm³ | Hardness: ≤100 HRB (annealed condition) 13.
High-Temperature Performance
- Maintains mechanical stability and corrosion resistance at temperatures up to 1,090°C (2,000°F) 23.
3. Standards and Specifications
C276 nuts comply with:
- ASTM B574/B575: Standard for nickel-molybdenum-chromium alloy bars and forgings 24.
- ASME SB574/SB575: Equivalent specifications for pressure vessel components 23.
- DIN 934/936: Metric hex nuts and flange nuts 4.
4. Types of Nuts Produced with C276
- Hex Nuts (ASTM A194 Gr. C276)
- Lock Nuts (e.g., Nylock, all-metal prevailing torque)
- Flange Nuts (SAE J995 compliant)
- Cap Nuts and Wing Nuts for specialized equipment 24.
5. Key Applications
Chemical & Petrochemical
- Reactors, heat exchangers, and piping systems handling sulfuric acid, hydrochloric acid, and chlorine 12.
Marine & Offshore
- Subsea fasteners, seawater pumps, and desalination plants 24.
Power Generation
- Flue gas desulfurization (FGD) systems and gas turbine components 23.
Pharmaceutical
- Sterile equipment and reactors requiring non-reactive materials 16.
- C276 Nuts
- Hastelloy C-276 Fasteners
- UNS N10276 Nuts
- High-Temperature C276 Nuts
- “Corrosion-Resistant C276 Hex Nuts for Chemical Plants”
- “Hastelloy C-276 Lock Nuts for Marine Applications”
- “ASTM B574 C276 Flange Nuts”
Suggested Tables
Table 1: Chemical Composition of Hastelloy C-276 (wt%)
| C ≤0.01 | Cr 14.5-16.5 | Mo 15-17 | Fe 4-7 | Ni ≥57 | W 3-4.5 | Co ≤2.5 | 37
Table 2: Mechanical Properties
| Tensile Strength | Yield Strength | Elongation | Hardness | |
| ≥690 MPa | ≥283 MPa | ≥40% | ≤100 HRB | 12 |
Conclusion
Hastelloy C-276 nuts are indispensable in industries demanding extreme corrosion resistance and thermal stability. Their compliance with ASTM/ASME standards and superior alloy composition (nickel-molybdenum-chromium) make them ideal for harsh chemical, marine, and high-temperature environments.
Keywords: C276 nuts, Hastelloy C-276 fasteners, UNS N10276, chemical processing nuts, marine-grade alloy nuts.
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