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UNS S32750 Thread Rod
QS Fastener: UNS S32750 Thread Rod
Name: UNS S32750 Thread Rod
Standard: UNS
Material: S32750
Size: 5/16 to 4 inch
Length: 30 to 1000 mm
Grade: A
Class: 12.9
Application: Used for Chemical Processing, Petrochemicals and Subsea Equipment
Standard: UNS
Material: S32750
Size: 5/16 to 4 inch
Length: 30 to 1000 mm
Grade: A
Class: 12.9
Application: Used for Chemical Processing, Petrochemicals and Subsea Equipment
Quantity
UNS S32750 Thread Rod is manufactured from high-performance duplex stainless steel S32750 (UNS standard), offering exceptional corrosion resistance, high strength, and stress cracking resistance, making it suitable for harsh environments. The size range covers 5/16"to 4"(30 to 1000 mm in length), Grade A, Class 12.9, meeting the demands of high-strength applications such as chemical processing, petrochemical, and subsea equipment. Its superior resistance to chlorides and acidic media makes UNS S32750 Thread Rod an ideal choice for marine engineering and chemical processing industries.
After hot working and heat treatment, UNS S32750 Thread Rod undergoes cold working and thread forming to ensure high precision, superior strength, and excellent surface quality. This process primarily includes two critical stages: cold drawing & finishing and thread manufacturing.
1. Cold Drawing & Finishing
Cold drawing and finishing are key processes to enhance the surface finish, dimensional accuracy, and mechanical properties of UNS S32750 Thread Rod. The main steps are as follows:
Cold drawing and finishing are key processes to enhance the surface finish, dimensional accuracy, and mechanical properties of UNS S32750 Thread Rod. The main steps are as follows:
(1) Cold Drawing
- Process Principle: Solution-annealed UNS S32750 Thread Rod bars are drawn through tungsten carbide dies to reduce diameter and improve dimensional accuracy.
- Lubrication: Phosphate coatings or specialized lubricants (e.g., soap-based) are applied to minimize friction and prevent surface scratches on UNS S32750 Thread Rod.
- Work Hardening Effect: Cold drawing increases yield strength (~10–20%) but requires controlled deformation (typically ≤30%) to avoid excessive brittleness.
- Process Principle: Solution-annealed UNS S32750 Thread Rod bars are drawn through tungsten carbide dies to reduce diameter and improve dimensional accuracy.
- Lubrication: Phosphate coatings or specialized lubricants (e.g., soap-based) are applied to minimize friction and prevent surface scratches on UNS S32750 Thread Rod.
- Work Hardening Effect: Cold drawing increases yield strength (~10–20%) but requires controlled deformation (typically ≤30%) to avoid excessive brittleness.
(2) Straightening
- Multi-roller straightening machines or hydraulic presses are used to eliminate bends in UNS S32750 Thread Rod after cold drawing, ensuring straightness ≤0.5 mm/m.
- Optical measurement systems ensure compliance with high-precision applications (e.g., nuclear power, aerospace).
- Multi-roller straightening machines or hydraulic presses are used to eliminate bends in UNS S32750 Thread Rod after cold drawing, ensuring straightness ≤0.5 mm/m.
- Optical measurement systems ensure compliance with high-precision applications (e.g., nuclear power, aerospace).
(3) Surface Finishing
- Grinding/Polishing: For high surface finish requirements (Ra ≤0.8 µm), centerless grinders or belt polishers are employed.
- Pickling & Passivation (Optional): A nitric-hydrofluoric acid mixture removes oxide layers, enhancing the corrosion resistance of UNS S32750 Thread Rod.
- Grinding/Polishing: For high surface finish requirements (Ra ≤0.8 µm), centerless grinders or belt polishers are employed.
- Pickling & Passivation (Optional): A nitric-hydrofluoric acid mixture removes oxide layers, enhancing the corrosion resistance of UNS S32750 Thread Rod.
Performance Improvements After Cold Drawing & Finishing:
- Dimensional tolerance: ±0.02 mm (precision grade).
- Surface roughness: Ra ≤1.6 µm (superior to hot-rolled Ra ≥3.2 µm).
- Tensile strength: 850–900 MPa (Class 12.9 standard).
- Dimensional tolerance: ±0.02 mm (precision grade).
- Surface roughness: Ra ≤1.6 µm (superior to hot-rolled Ra ≥3.2 µm).
- Tensile strength: 850–900 MPa (Class 12.9 standard).
2. Thread Manufacturing
Thread formation on UNS S32750 Thread Rod requires a balance of precision and strength, achieved through two advanced methods:
Thread formation on UNS S32750 Thread Rod requires a balance of precision and strength, achieved through two advanced methods:
(1) CNC Precision Turning
- Equipment: Swiss-type lathes (e.g., Citizen L20) or multi-axis turning centers.
- Tooling: PVD-coated carbide inserts (e.g., TiAlN) for high-temperature wear resistance during UNS S32750 Thread Rod machining.
- Equipment: Swiss-type lathes (e.g., Citizen L20) or multi-axis turning centers.
- Tooling: PVD-coated carbide inserts (e.g., TiAlN) for high-temperature wear resistance during UNS S32750 Thread Rod machining.
- Parameters:
- Cutting speed: 80–120 m/min (prevents work hardening).
- Feed rate: 0.1–0.2 mm/rev with high-pressure coolant for chip evacuation.
- Cutting speed: 80–120 m/min (prevents work hardening).
- Feed rate: 0.1–0.2 mm/rev with high-pressure coolant for chip evacuation.
- Advantages:
- Thread accuracy: ISO 4H/6g, pitch error ≤0.02 mm.
- Suitable for non-standard threads (e.g., trapezoidal, API) and low-volume customization.
- Thread accuracy: ISO 4H/6g, pitch error ≤0.02 mm.
- Suitable for non-standard threads (e.g., trapezoidal, API) and low-volume customization.
(2) Thread Rolling
- Process Principle: Radial pressure from high-speed rollers plastically deforms UNS S32750 Thread Rod to form threads (chipless process).
- Key Parameters:
- Rolling force: 20–50 tons (adjustable per thread size).
- Speed: 60–100 RPM for uniform forming.
- Process Principle: Radial pressure from high-speed rollers plastically deforms UNS S32750 Thread Rod to form threads (chipless process).
- Key Parameters:
- Rolling force: 20–50 tons (adjustable per thread size).
- Speed: 60–100 RPM for uniform forming.
- Advantages:
- 15–20% increased thread root strength due to work hardening.
- High productivity (20–30 pieces/min) for mass production.
- Surface finish: Ra ≤0.4 µm, reducing thread friction.
- 15–20% increased thread root strength due to work hardening.
- High productivity (20–30 pieces/min) for mass production.
- Surface finish: Ra ≤0.4 µm, reducing thread friction.
Thread Inspection Standards:
- Go/No-Go Gauges: Ensure compliance with ANSI/ASME B1.1.
- Optical Projectors: Measure pitch, flank angle (60° or 55°), and pitch diameter.
- Magnetic Particle Testing (Optional): Detects surface microcracks for critical applications (e.g., subsea equipment).
- Go/No-Go Gauges: Ensure compliance with ANSI/ASME B1.1.
- Optical Projectors: Measure pitch, flank angle (60° or 55°), and pitch diameter.
- Magnetic Particle Testing (Optional): Detects surface microcracks for critical applications (e.g., subsea equipment).
3. Process Comparison & Selection Guide
| Process | CNC Turning | Thread Rolling |
| Precision | ±0.01 mm (High) | ±0.05 mm (Moderate) |
| Strength | Maintains base strength | 15–20% increase |
| Efficiency | Low (small batches) | High (mass production) |
| Cost | Higher (tool wear) | Lower (die longevity) |
Recommended Applications:
- Thread Rolling: Standard fasteners for oil/gas pipelines, ship anchor chains.
- CNC Turning: High-precision screws for nuclear valves, aircraft engines.
- Thread Rolling: Standard fasteners for oil/gas pipelines, ship anchor chains.
- CNC Turning: High-precision screws for nuclear valves, aircraft engines.
By optimizing cold working and thread-forming processes, UNS S32750 Thread Rod achieves a unique combination of corrosion resistance, precision, and durability, making it a dependable solution for extreme industrial environments.
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