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UNS S32205 Hex Head Cap Screw
QS Fastener: UNS S32205 Hex Head Cap Screw
Name: UNS S32205 Hex Head Cap Screw
Material: UNS S32205
Usage: For High Chloride and Marine Environments
Standard: ANSI B18.2.1 Hex Head Bolt with ANSI B18.2.2 Heavy Hex Nut
Size: 1 Inch
Thread: 7 UNC
Length: 70mm
Material: UNS S32205
Usage: For High Chloride and Marine Environments
Standard: ANSI B18.2.1 Hex Head Bolt with ANSI B18.2.2 Heavy Hex Nut
Size: 1 Inch
Thread: 7 UNC
Length: 70mm
Quantity
UNS S32205 Hex Head Cap Screw – Forged from duplex stainless steel UNS S32205, delivering superior resistance to high-chloride corrosion and seawater erosion. With 1-inch diameter and 7 UNC coarse threads, it pairs with ANSI B18.2.2 heavy hex nuts to ensure vibration-resistant security for 70mm studs in dynamic applications. Certified to ANSI B18.2.1 standards, it's the ideal choice for offshore platforms, chemical pipelines, and other extreme environments.
1. UNS S32205 Hex Head Cap Screw High-Temperature Performance (20-600°C)
(1) Low-to-Medium Temperature Range (20-300°C)
- Strength retention: Tensile strength ≥620MPa (>85% of room temperature value)
- Microstructural stability: Balanced ferrite/austenite phase ratio (~50/50)
- Creep resistance: <0.2% deformation under 300°C/100MPa for 1000 hours (ASTM E139)
(1) Low-to-Medium Temperature Range (20-300°C)
- Strength retention: Tensile strength ≥620MPa (>85% of room temperature value)
- Microstructural stability: Balanced ferrite/austenite phase ratio (~50/50)
- Creep resistance: <0.2% deformation under 300°C/100MPa for 1000 hours (ASTM E139)
(2) Medium-High Temperature Range (300-450°C)
- Strength degradation: 520-580MPa tensile strength (70-80% of RT value)
- 475°C embrittlement warning: UNS S32205 Hex Head Cap Screw is safe for short-term exposure but unsuitable for prolonged service
- Oxidation behavior: Cr₂O₃ layer formation with <0.1mg/cm²·h weight gain (ASTM G54)
- Strength degradation: 520-580MPa tensile strength (70-80% of RT value)
- 475°C embrittlement warning: UNS S32205 Hex Head Cap Screw is safe for short-term exposure but unsuitable for prolonged service
- Oxidation behavior: Cr₂O₃ layer formation with <0.1mg/cm²·h weight gain (ASTM G54)
(3) High-Temperature Range (450-600°C)
- Short-term strength: 370-450MPa at 600°C (60% retention)
- Emergency data: δ-ferrite content increases to 60% after 24h at 650°C
- Toughness change: Impact energy drops from 100J to 85J after 600°C/100h exposure
- Short-term strength: 370-450MPa at 600°C (60% retention)
- Emergency data: δ-ferrite content increases to 60% after 24h at 650°C
- Toughness change: Impact energy drops from 100J to 85J after 600°C/100h exposure
2. UNS S32205 Hex Head Cap Screw Low-Temperature Performance (-50 to 20°C)
(1) Strength Characteristics
- Yield strength: 550MPa at -50°C (+10% vs RT)
- Tensile strength: 700-720MPa at -50°C (vs 650MPa at RT)
(1) Strength Characteristics
- Yield strength: 550MPa at -50°C (+10% vs RT)
- Tensile strength: 700-720MPa at -50°C (vs 650MPa at RT)
(2) Toughness Performance
- Impact energy: ≥80J Charpy V-notch at -50°C (EN ISO 148-1)
- Fracture morphology: SEM reveals ductile dimple structure
- Impact energy: ≥80J Charpy V-notch at -50°C (EN ISO 148-1)
- Fracture morphology: SEM reveals ductile dimple structure
(3) Extreme Cold Validation
- LNG compatibility: ≥50J impact energy in -162°C liquid nitrogen (extra-low carbon grade)
- Thermal shock test: <3% strength variation after -50°C pre-cooling (ASTM F606M)
- LNG compatibility: ≥50J impact energy in -162°C liquid nitrogen (extra-low carbon grade)
- Thermal shock test: <3% strength variation after -50°C pre-cooling (ASTM F606M)
3. UNS S32205 Hex Head Cap Screw Engineering Application Guidelines
UNS S32205 Hex Head Cap Screw is specifically recommended for:
- LNG equipment: -160 to 50°C thermal cycling (requires special heat treatment)
- Flue gas desulfurization: 60-200°C wet Cl⁻ environments (recommend 980°C solution treatment)
- Air separation units: -196°C static loading (ferrite content ≤55%)
UNS S32205 Hex Head Cap Screw is specifically recommended for:
- LNG equipment: -160 to 50°C thermal cycling (requires special heat treatment)
- Flue gas desulfurization: 60-200°C wet Cl⁻ environments (recommend 980°C solution treatment)
- Air separation units: -196°C static loading (ferrite content ≤55%)
4. UNS S32205 Hex Head Cap Screw Critical Limitations & Optimization
- Temperature limits:
- Long-term use ≤300°C
- Short-term exposure ≤650°C (requires post-inspection)
- Temperature limits:
- Long-term use ≤300°C
- Short-term exposure ≤650°C (requires post-inspection)
- Performance enhancements:
- 0.1% Cu addition improves high-temperature stability
- Dual-stage aging (550°C+300°C) enhances wide-temperature performance
- 0.1% Cu addition improves high-temperature stability
- Dual-stage aging (550°C+300°C) enhances wide-temperature performance
5. Comparative Data
| Performance Metric | UNS S32205 Hex Head Cap Screw | 316L Bolts | Advantage |
| Tensile strength (20°C) | 650MPa | 485MPa | +34% |
| Cl⁻ resistance limit | 100,000ppm | 30,000ppm | 3.3× higher |
| Service life | 15-20 years | 5-8 years | 200% longer |
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