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S32550 Stud Bolt
QS: S32550 Stud Bolt
Name: S32550 Stud Bolt
Standard: ANSI, DIN, UNS, ASTM
Material: S32550
Size: 5/16 to 4 inch
Lenght: 30 to 3000 mm
Grade: A
Class: 12.9
Application: Marine engineering, Chemical and Petroleum Industries, Desalination and Water Treatment, Energy Industry, Food and Pharmaceutical Industry
Standard: ANSI, DIN, UNS, ASTM
Material: S32550
Size: 5/16 to 4 inch
Lenght: 30 to 3000 mm
Grade: A
Class: 12.9
Application: Marine engineering, Chemical and Petroleum Industries, Desalination and Water Treatment, Energy Industry, Food and Pharmaceutical Industry
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S32550 Stud Bolt
Manufactured from high-strength super duplex stainless steel S32550 (UNS S32550), the S32550 Stud Bolt complies with international standards such as ANSI, DIN, and ASTM. It is available in sizes ranging from 5/16 to 4 inches (length: 30–3000 mm) and meets performance Class 12.9 (Grade A), combining exceptional corrosion resistance with mechanical strength. Designed for harsh environments, it is ideal for marine engineering, petrochemical, desalination, energy, and food/pharmaceutical industries. It effectively resists chloride stress corrosion and pitting, serving as a superior alternative to conventional 316L and 2205 stainless steels, ensuring long-term operational stability.
Manufactured from high-strength super duplex stainless steel S32550 (UNS S32550), the S32550 Stud Bolt complies with international standards such as ANSI, DIN, and ASTM. It is available in sizes ranging from 5/16 to 4 inches (length: 30–3000 mm) and meets performance Class 12.9 (Grade A), combining exceptional corrosion resistance with mechanical strength. Designed for harsh environments, it is ideal for marine engineering, petrochemical, desalination, energy, and food/pharmaceutical industries. It effectively resists chloride stress corrosion and pitting, serving as a superior alternative to conventional 316L and 2205 stainless steels, ensuring long-term operational stability.
In the petrochemical industry, equipment is constantly exposed to high temperatures, high pressures, and highly corrosive media (e.g., hydrogen sulfide, chloride ions, acidic gases), demanding fasteners with outstanding corrosion resistance, mechanical strength, and long-term reliability. The S32550 Stud Bolt (super duplex stainless steel UNS S32550/F55 double-end stud) excels in these conditions, making it a critical component for flange connections in sour oil/gas fields, refinery equipment, and petrochemical pipelines.
1. Applications in Sour Oil/Gas Fields (High H₂S/CO₂ Environments)
In sulfur-rich oil/gas fields (e.g., offshore platforms, shale gas extraction), hydrogen sulfide (H₂S) and carbon dioxide (CO₂) can cause stress corrosion cracking (SCC) and hydrogen embrittlement in standard stainless steels (e.g., 316L). The S32550 Stud Bolt offers key advantages:
- Sulfide Stress Corrosion Cracking (SSCC) Resistance:
- Its alloy design, with high molybdenum (3% Mo), nitrogen (0.3% N), and copper (1.5% Cu), significantly enhances H₂S resistance, complying with NACE MR0175/ISO 15156 standards for *Sour Service* conditions.
- In wells containing Cl⁻ and H₂S, its pitting resistance (PREN≥40) far exceeds that of 304/316 stainless steels.
In sulfur-rich oil/gas fields (e.g., offshore platforms, shale gas extraction), hydrogen sulfide (H₂S) and carbon dioxide (CO₂) can cause stress corrosion cracking (SCC) and hydrogen embrittlement in standard stainless steels (e.g., 316L). The S32550 Stud Bolt offers key advantages:
- Sulfide Stress Corrosion Cracking (SSCC) Resistance:
- Its alloy design, with high molybdenum (3% Mo), nitrogen (0.3% N), and copper (1.5% Cu), significantly enhances H₂S resistance, complying with NACE MR0175/ISO 15156 standards for *Sour Service* conditions.
- In wells containing Cl⁻ and H₂S, its pitting resistance (PREN≥40) far exceeds that of 304/316 stainless steels.
- High-Pressure Adaptability:
- Tensile strength ≥800 MPa, capable of withstanding extreme loads in wellhead assemblies, *Xmas Trees*, and high-pressure piping systems.
- Tensile strength ≥800 MPa, capable of withstanding extreme loads in wellhead assemblies, *Xmas Trees*, and high-pressure piping systems.
Typical Applications:
- S32550 Stud Bolt for wellhead flanges
- Downhole tool connectors
- Gathering pipeline flange sealing
- S32550 Stud Bolt for wellhead flanges
- Downhole tool connectors
- Gathering pipeline flange sealing
2. Refinery Equipment (High Temperature, Strong Acid Corrosion)
In refinery units (e.g., distillation columns, hydrotreating reactors, FCC units), media may contain sulfuric acid, hydrofluoric acid, or organic acids, with temperatures fluctuating between -50°C and 300°C. The S32550 Stud Bolt features:
- Resistance to General and Localized Corrosion:
- Excellent performance against naphthenic acid corrosion (common in crude oils) and polythionic acid corrosion (formed during shutdowns).
- Its duplex microstructure (50% ferrite + 50% austenite) reduces intergranular corrosion risks compared to austenitic steels (e.g., 317L).
In refinery units (e.g., distillation columns, hydrotreating reactors, FCC units), media may contain sulfuric acid, hydrofluoric acid, or organic acids, with temperatures fluctuating between -50°C and 300°C. The S32550 Stud Bolt features:
- Resistance to General and Localized Corrosion:
- Excellent performance against naphthenic acid corrosion (common in crude oils) and polythionic acid corrosion (formed during shutdowns).
- Its duplex microstructure (50% ferrite + 50% austenite) reduces intergranular corrosion risks compared to austenitic steels (e.g., 317L).
- High-Temperature Strength Retention:
- Maintains yield strength ≥550 MPa at 300°C, preventing flange leakage due to creep deformation.
- Maintains yield strength ≥550 MPa at 300°C, preventing flange leakage due to creep deformation.
Typical Applications:
- S32550 Stud Bolt for hydrotreater reactor flanges
- Heat exchanger tube sheet fasteners
- High-temperature/pressure valve connections
- S32550 Stud Bolt for hydrotreater reactor flanges
- Heat exchanger tube sheet fasteners
- High-temperature/pressure valve connections
3. Petrochemical Pipeline Flanges (Chloride Corrosion, Sealing Reliability)
Pipelines transporting media with chloride ions (Cl⁻), organic solvents, or alkaline solutions are prone to pitting and crevice corrosion. The S32550 Stud Bolt provides:
- Chloride Ion Resistance:
- High chromium (22% Cr) and molybdenum (3% Mo) content forms a dense passive film, outperforming 316L in seawater cooling systems or Cl⁻-rich process pipelines.
Pipelines transporting media with chloride ions (Cl⁻), organic solvents, or alkaline solutions are prone to pitting and crevice corrosion. The S32550 Stud Bolt provides:
- Chloride Ion Resistance:
- High chromium (22% Cr) and molybdenum (3% Mo) content forms a dense passive film, outperforming 316L in seawater cooling systems or Cl⁻-rich process pipelines.
- Sealing Integrity:
- High-precision threads (ISO 4H/6g) ensure even load distribution on flange faces, preventing leaks caused by bolt plastic deformation.
- High-precision threads (ISO 4H/6g) ensure even load distribution on flange faces, preventing leaks caused by bolt plastic deformation.
- Fatigue Resistance:
- The duplex steel microstructure inhibits crack propagation, ideal for vibration-prone pump/compressor flanges.
- The duplex steel microstructure inhibits crack propagation, ideal for vibration-prone pump/compressor flanges.
Typical Applications:
- S32550 Stud Bolt for LNG pipeline flanges
- High-temperature ethylene cracker piping
- Acid/alkali storage tank manway covers
- S32550 Stud Bolt for LNG pipeline flanges
- High-temperature ethylene cracker piping
- Acid/alkali storage tank manway covers
4. Advantages Over Traditional Materials
| Material | Cl⁻ Resistance | H₂S Resistance | Strength (MPa) | Cost |
| S32550 Stud Bolt | ★★★★★ | ★★★★★ | ≥800 | Medium |
| Duplex 2205 | ★★★★☆ | ★★★★☆ | ≥620 | Low |
| 316L Austenitic | ★★☆☆☆ | ★★☆☆☆ | ≥485 | Low |
| Hastelloy C276 | ★★★★★ | ★★★★★ | ≥690 | Very High |
Conclusion: The S32550 Stud Bolt achieves the optimal balance of cost-effectiveness, corrosion resistance, and strength, making it the preferred fastening solution for demanding petrochemical applications.
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