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UNS S32205 Hex Nut
QS Fastener: UNS S32205 Hex Nut
Name: UNS S32205 Hex Nut
Reference Standard: NACE MR0175
Material: Stainless Steel Grade 2205 Duplex
Standard: DIN934
Size: M80
Feature: Exhibits Excellent Corrosion Resistance
Application: For Oil and Gas Exploration.
Reference Standard: NACE MR0175
Material: Stainless Steel Grade 2205 Duplex
Standard: DIN934
Size: M80
Feature: Exhibits Excellent Corrosion Resistance
Application: For Oil and Gas Exploration.
Quantity
UNS S32205 Hex Nut is manufactured from duplex stainless steel 2205 (UNS S32205), complying with DIN 934 standards and certified for hydrogen sulfide resistance per NACE MR0175. Designed for highly corrosive environments in oil and gas exploration, this UNS S32205 Hex Nut in M80 specification delivers exceptional structural strength. Its austenitic-ferritic duplex microstructure outperforms 316 stainless steel in chloride and acidic media, making it ideal for critical connections in offshore platforms, deep-well manifolds, and other energy industry applications where high-security fastening is paramount.
Comparative Analysis of High-Strength Properties in UNS S32205 Hex Nut
1. Strength Data Comparison (Room Temperature)
1. Strength Data Comparison (Room Temperature)
| Material | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Hardness (HBW) |
| UNS S32205 Hex Nut | ≥450 | 620-750 | ≥25 | 200-290 |
| 316 Austenitic SS | ≥205 | 515-690 | ≥40 | 150-220 |
| AISI 4140 Low-Alloy Steel | ≥655 (Quenched & Tempered) | 850-1000 | ≥18 | 250-320 |
> Key Conclusions:
> - UNS S32205 Hex Nut has 2.2× higher yield strength than 316 (450 vs. 205 MPa) and 20% greater tensile strength.
> - Achieves near quenched-and-tempered alloy steel strength without heat treatment.
> - UNS S32205 Hex Nut has 2.2× higher yield strength than 316 (450 vs. 205 MPa) and 20% greater tensile strength.
> - Achieves near quenched-and-tempered alloy steel strength without heat treatment.
2. High-Strength Mechanism Explained
The superior performance of UNS S32205 Hex Nut stems from its duplex microstructure and nitrogen alloying:
1) Ferritic Phase Strengthening (40-50% content)
- High chromium (22%) and molybdenum (3%) enhance corrosion resistance and strength.
- Nitrogen (0.14–0.20%) interstitial solid solution provides additional strengthening (vs. ≤0.10% in 316L).
The superior performance of UNS S32205 Hex Nut stems from its duplex microstructure and nitrogen alloying:
1) Ferritic Phase Strengthening (40-50% content)
- High chromium (22%) and molybdenum (3%) enhance corrosion resistance and strength.
- Nitrogen (0.14–0.20%) interstitial solid solution provides additional strengthening (vs. ≤0.10% in 316L).
2) Austenitic Phase for Toughness
- Prevents brittleness inherent in pure ferritic structures, maintaining elongation ≥25%.
- Prevents brittleness inherent in pure ferritic structures, maintaining elongation ≥25%.
3) Cold-Forming Advantages
- Lower work-hardening rate than 316, making it better suited for cold-forging high-strength bolts.
- Lower work-hardening rate than 316, making it better suited for cold-forging high-strength bolts.
3. Feasibility as a Low-Alloy Steel Alternative
| Parameter | UNS S32205 Hex Nut | A193 B7 (4140 Steel) | Advantage |
| Yield Strength | 450 MPa | 655 MPa (Q&T) | Meets medium-high load requirements |
| Corrosion Resistance | No coating needed for Cl⁻ resistance | Requires protective coatings | Reduces lifecycle costs |
| Hydrogen Embrittlement Risk | None | High risk | Ideal for H₂S environments |
4. Design & Economic Recommendations
- Lightweighting: Replace 316 stainless steel nuts (e.g., M10) with UNS S32205 Hex Nut (M8), achieving 20% weight reduction while increasing strength.
- Lightweighting: Replace 316 stainless steel nuts (e.g., M10) with UNS S32205 Hex Nut (M8), achieving 20% weight reduction while increasing strength.
- Cost Comparison:
- Initial price is 30–50% higher than 316, but eliminates coating maintenance (60% lower annual costs in marine environments).
- Initial price is 30–50% higher than 316, but eliminates coating maintenance (60% lower annual costs in marine environments).
Conclusion
UNS S32205 Hex Nut achieves the optimal balance of corrosion resistance and high strength through duplex synergy, offering three core values:
1. Direct Replacement for 316 Stainless Steel: Solves strength insufficiency issues.
2. Alternative to Low-Alloy Steels: Eliminates hydrogen embrittlement risks in H₂S environments (NACE MR0175 certified).
3. Lifecycle Economics: Maintenance-free properties significantly reduce long-term costs.
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