Description
Super Duplex 32750 Full Threaded Studs
Super Duplex 32750 Full Threaded Studs are high-strength duplex stainless steel fasteners for demanding corrosion and pressure-service applications. They offer high mechanical strength with strong resistance to chloride pitting, crevice corrosion and stress-corrosion cracking. These studs suit critical industrial, marine, offshore, chemical and oil and gas applications.
Technical Overview
UNS S32750 is commonly known as Super Duplex 2507. ASTM A1082/A1082M covers high-strength stainless steel bolting for special-purpose applications and includes duplex stainless steel grades. For S32750, the ASTM grade symbol is TB 32750. The material is solution treated and water quenched as specified by the standard.
Key Features
High Mechanical Strength
High tensile and yield strength support demanding bolting applications.
Excellent Corrosion Resistance
Strong resistance to chloride pitting, crevice corrosion and stress-corrosion cracking.
Super Duplex Structure
A balanced ferritic-austenitic structure combines strength and corrosion resistance.
Custom Supply
Metric and inch threads, standard or custom lengths, inspection and MTC documentation can be supplied.
Chemical Composition - UNS S32750
| Element | Requirement, wt. % |
|---|---|
| Carbon (C) | 0.030 max. |
| Manganese (Mn) | 1.20 max. |
| Silicon (Si) | 0.80 max. |
| Phosphorus (P) | 0.035 max. |
| Sulfur (S) | 0.020 max. |
| Chromium (Cr) | 24.0 - 26.0 |
| Nickel (Ni) | 6.0 - 8.0 |
| Molybdenum (Mo) | 3.0 - 5.0 |
| Nitrogen (N) | 0.24 - 0.32 |
| Copper (Cu) | 0.50 max. |
| Iron (Fe) | Balance |
Physical Properties - Typical Values
| Property | Typical Value |
|---|---|
| Density | Approx. 7.75 g/cm3 |
| Melting Range | Approx. 1350 - 1400 deg. C |
| Modulus of Elasticity | Approx. 200 GPa |
| Poisson Ratio | Approx. 0.30 |
| Thermal Conductivity | Approx. 15 W/m.K |
| Specific Heat | Approx. 500 J/kg.K |
| Thermal Expansion | Approx. 13 x 10^-6 / deg. C |
Physical properties are typical engineering values and are not ASTM A1082 acceptance requirements unless specifically stated.
Mechanical Properties - ASTM A1082 S32750
| Property | 2 in. and under | Over 2 in. |
|---|---|---|
| Tensile Strength | 800 MPa min. | 760 MPa min. |
| Yield Strength, 0.2% Offset | 550 MPa min. | 515 MPa min. |
| Elongation | 15% min. | 15% min. |
| Hardness | 33 HRC max. / 310 HB max. | 33 HRC max. / 310 HB max. |
These are ASTM A1082/A1082M duplex-grade requirements for UNS S32750. The applicable edition and purchase specification govern the supplied material.
Stud Dimensional Standards - DIN, ISO and ASME
Material and dimensional standards should be specified separately. The following standards are useful references for studs and threads.
| System | Standard | Application |
|---|---|---|
| DIN | DIN 976-1 | Threaded rods and fully threaded fastener dimensions |
| DIN | DIN 938 / 939 / 940 | Double-end stud configurations |
| ISO | ISO 261 | Metric thread sizes and pitch series |
| ISO | ISO 965-1 | Metric thread tolerances |
| ASME | B18.31.1M | Metric continuous and double-end studs |
| ASME | B18.31.2 | Inch continuous and double-end studs |
| ASME | B1.1 | Unified inch threads including UNC and UNF |
DIN, ISO and ASME define geometry or thread requirements. ASTM A1082 defines the S32750 bolting material requirements.
Metric Stud Dimensions and Thread Pitch - M8 to M24
| Size | Nominal Diameter, mm | Coarse Pitch, mm | Common Fine Pitch, mm |
|---|---|---|---|
| M8 | 8.00 | 1.25 | 1.00 |
| M10 | 10.00 | 1.50 | 1.00 |
| M12 | 12.00 | 1.75 | 1.50 |
| M14 | 14.00 | 2.00 | 1.50 |
| M16 | 16.00 | 2.00 | 1.50 |
| M18 | 18.00 | 2.50 | 2.00 |
| M20 | 20.00 | 2.50 | 2.00 |
| M22 | 22.00 | 2.50 | 2.00 |
| M24 | 24.00 | 3.00 | 2.00 |
Inch Stud Dimensions and Thread Pitch - 3/8 inch to 1 inch
| Size | Diameter, inch | UNC, TPI | BSW, TPI |
|---|---|---|---|
| 3/8 inch | 0.375 | 16 | 16 |
| 1/2 inch | 0.500 | 13 | 12 |
| 5/8 inch | 0.625 | 11 | 11 |
| 3/4 inch | 0.750 | 10 | 10 |
| 7/8 inch | 0.875 | 9 | 9 |
| 1 inch | 1.000 | 8 | 8 |
UNC is an ASME Unified inch thread system. BSW is a British Standard Whitworth system. They are not interchangeable.
Solution Treatment and Quenching
| Process | ASTM A1082 S32750 Requirement |
|---|---|
| Solution Treatment | 1880 - 2060 deg. F (1025 - 1125 deg. C) |
| Quenching | Water quench |
| Purpose | Rapid cooling establishes the required duplex structure and supports corrosion resistance and mechanical properties. |
Heat treatment must follow the applicable ASTM edition and approved manufacturing procedure.
Applications
Oil and Gas
Flanges, piping, valves and equipment exposed to chloride-containing service.
Offshore and Marine
Fastening applications requiring high strength and seawater corrosion resistance.
Chemical Processing
Process equipment and piping requiring duplex stainless steel performance.
Petrochemical and Power
Pressure equipment, heat exchangers, pumps and industrial assemblies.
Why Aanuraj
- Specialized supply of stainless steel and high-performance alloy fasteners.
- Super Duplex 32750 full threaded studs in metric and inch configurations.
- Custom diameters, thread forms and lengths against drawing or enquiry.
- Dimensional and thread inspection for critical requirements.
- Material Test Certificate and inspection documentation available as specified.
- Technical support for grade, size, thread, heat treatment and application requirements.
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Technical Enquiry
Send your diameter, thread, length, quantity and application. Aanuraj can review the requirement and provide the applicable material and inspection documentation.
Technical reference: ASTM A1082/A1082M covers high-strength stainless steel bolting for special-purpose applications and includes UNS S32750. Dimensional standards such as DIN, ISO and ASME should be specified separately with the required thread form, diameter, length and tolerance.
