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UNS S32750 Stud Bolt
QS Fastener: UNS S32750 Stud Bolt
Name: UNS S32750 Stud Bolt
Standard: UNS
Material: S32750
Size: M8 to M100
Length: 30 to 3000 mm
Grade: A
Class: 12.9
Application: Used for Chemical Processing, Petrochemicals and Subsea Equipment
Standard: UNS
Material: S32750
Size: M8 to M100
Length: 30 to 3000 mm
Grade: A
Class: 12.9
Application: Used for Chemical Processing, Petrochemicals and Subsea Equipment
Quantity
UNS S32750 Stud Bolt, manufactured from super duplex stainless steel S32750, exhibits exceptional corrosion resistance, high strength, and stress corrosion cracking resistance, making it an ideal choice for extreme environments such as chemical processing, petrochemical, and subsea equipment. The UNS S32750 Stud Bolt is available in sizes ranging from M8 to M100, lengths from 30 to 3000 mm, and strength class 12.9. Its high reliability and extended service life significantly reduce maintenance costs.
In the manufacturing process of UNS S32750 Stud Bolt, thread forming is a critical step that determines performance. Compared to traditional thread cutting, the thread rolling process significantly enhances the fatigue strength and corrosion resistance of these duplex stainless steel bolts.
1. Thread Rolling Process Principle
Thread rolling is a cold-forming technique particularly suited for mass production of UNS S32750 Stud Bolt. High-hardness dies apply extreme pressure to the metal blank, inducing plastic deformation to form threads. Instead of removing material, this process strengthens the thread structure through grain realignment.
Thread rolling is a cold-forming technique particularly suited for mass production of UNS S32750 Stud Bolt. High-hardness dies apply extreme pressure to the metal blank, inducing plastic deformation to form threads. Instead of removing material, this process strengthens the thread structure through grain realignment.
- Forming Methods:
- Flat Die Rolling: Suitable for UNS S32750 Stud Bolt with short threads.
- Cylindrical Die Rolling: Utilizes two or three rotating dies for synchronized compression, ensuring high efficiency and suitability for mass production of M8-M100 sizes.
- Flat Die Rolling: Suitable for UNS S32750 Stud Bolt with short threads.
- Cylindrical Die Rolling: Utilizes two or three rotating dies for synchronized compression, ensuring high efficiency and suitability for mass production of M8-M100 sizes.
2. Performance Enhancements of UNS S32750 Stud Bolt Through Thread Rolling
2.1 Fatigue Resistance Optimization
- Continuous Grain Flow: Rolling aligns metal grains along the thread profile (see Fig. 1), avoiding grain disruption caused by cutting, thus increasing the fatigue life of UNS S32750 Stud Bolt by 30–50%.
2.1 Fatigue Resistance Optimization
- Continuous Grain Flow: Rolling aligns metal grains along the thread profile (see Fig. 1), avoiding grain disruption caused by cutting, thus increasing the fatigue life of UNS S32750 Stud Bolt by 30–50%.
- Compressive Stress Layer: Generates residual compressive stress at the thread root, significantly improving performance.
2.2 Mechanical Strength Enhancement
- Work Hardening Effect: The hardness of UNS S32750 Stud Bolt increases by 10–15% after rolling, with the thread section achieving a yield strength exceeding 650 MPa.
- Work Hardening Effect: The hardness of UNS S32750 Stud Bolt increases by 10–15% after rolling, with the thread section achieving a yield strength exceeding 650 MPa.
- No Machining Defects: Surface roughness (Ra) can be controlled below 0.8 μm.
2.3 Corrosion Resistance Retention
- Dense Surface Structure: Ensures superior performance of UNS S32750 Stud Bolt in chloride-rich environments.
- Dense Surface Structure: Ensures superior performance of UNS S32750 Stud Bolt in chloride-rich environments.
3. Key Control Points for Thread Rolling of UNS S32750 Stud Bolt
3.1 Material Pre-Treatment
- Solution Annealed State: Ensures optimal phase balance for UNS S32750 Stud Bolt.
3.1 Material Pre-Treatment
- Solution Annealed State: Ensures optimal phase balance for UNS S32750 Stud Bolt.
- Lubricant Selection: High-viscosity extreme-pressure (EP) lubricants protect dies and bolt surfaces.
3.2 Die Design and Maintenance
- Die Material: Tungsten carbide (hardness ≥ HRC 62) guarantees thread precision for UNS S32750 Stud Bolt.
- Die Material: Tungsten carbide (hardness ≥ HRC 62) guarantees thread precision for UNS S32750 Stud Bolt.
- Thread Accuracy: Complies with ISO 68-1 standard, with strict pitch diameter tolerances.
4. Process Comparison
| Parameter | Rolled Thread (for UNS S32750 Stud Bolt) | Cut Thread |
| Material Utilization | 100% | 80–90% |
| Fatigue Strength | 30–50% improvement | Prone to stress concentration |
5. Conclusion
For high-end fasteners like UNS S32750 Stud Bolt, thread rolling enhances performance through multiple optimizations, making it the preferred manufacturing method in demanding industries such as oil & gas and marine engineering. Choosing UNS S32750 Stud Bolt with rolled threads ensures long-term operational reliability.
For high-end fasteners like UNS S32750 Stud Bolt, thread rolling enhances performance through multiple optimizations, making it the preferred manufacturing method in demanding industries such as oil & gas and marine engineering. Choosing UNS S32750 Stud Bolt with rolled threads ensures long-term operational reliability.
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