Super Duplex Steel S32750 Stud Bolts
Super Duplex Steel S32750 stud bolts are high-performance fasteners for harsh environments. These bolts are 25% chromium, 4% molybdenum, and 7% nickle. This specific combination provides them with a dual-phase microstructure of austenite and ferrite. You get the strength of ferritic steel and the corrosion resistance of austenitic steel in one part. In the industry, these are often called Grade 2507 fasteners. They are used primarily in offshore oil and gas, desalination plants, and chemical processing because they handle chloride-induced stress corrosion cracking very well.
Price of Super Duplex Steel S32750 Stud Bolts
The Super Duplex Steel S32750 Stud Bolts price varies based on raw material market rates and the complexity of the specific fastener dimensions you need for your project.
Approx Price Range
The price varies with the current price of nickel and molybdenum on the world market, both of which are key materials of the S32750 alloy.
Price Per Unit / Kg
A standard M16 x 100mm stud bolt might cost anywhere from ₹1,400-1,498/kg and ₹180 to ₹3,157 per piece. Buying per kilogramme is usually more cost-effective for large-scale industrial procurement and bulk piping projects.
Factors Affecting Price
Several things change the final cost. These include the size of the order, the complexity of the threading requirements, any special coating or surface finishes requested, and the current availability of high-grade raw material stock.
Types of Super Duplex Steel S32750 Stud Bolts
You will find several different configurations of these stud bolts depending on how they need to be installed.
- S32750 Fully Threaded Stud Bolts
- S32750 Tap End Stud Bolts
- S32750 Double End Stud Bolts
- S32750 Flange Stud Bolts
- S32750 Reduced Shank Stud Bolts
Specifications of Super Duplex Steel S32750 Stud Bolts
Standard specifications ensure that the bolts meet the safety requirements for high-pressure and corrosive environments. Most manufacturers follow these common international standards.\
|
Feature |
Details |
|
Standard |
ASTM A182, A479, ASME B18.31.2 |
|
Size Range |
M6 to M100 or 1/4" to 4" |
|
Length |
20mm to 5000mm |
|
Threads |
METRIC, UN, UNC, UNF, BSW |
|
Tolerance |
+/- 0.01mm to 0.05mm |
|
Finish |
Plain, Zinc Plated, Hot Dip Galvanised, PTFE Coated |
Chemical Properties of Super Duplex Steel S32750 Stud Bolts
The chemical composition is what makes these bolts perform better than standard duplex. The high PREN (Pitting Resistance Equivalent Number) value is a direct result of these specific elements.
|
Element |
Composition |
|
Grade |
S32750 |
|
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) |
24.00 – 26.00 |
|
Nickel (Ni) |
6.00 – 8.00 |
Mechanical Properties Super Duplex Steel S32750 Stud Bolts
These bolts have very high yield strength compared to 300-series stainless steel. This allows for lighter designs because you can use smaller bolts to achieve the same clamping force.\
|
Mechanical Property |
Value |
|
0.2% Proof Stress (N/mm²) [ksi] minimum |
550 [79.8] |
|
Tensile Strength (N/mm²) [ksi] minimum |
800 [116] |
|
Elongation (%) minimum |
25 |
|
Hardness (HBN) |
270 max |
|
Reduction of Cross-Section Area (%) |
45 |
Physical Properties Super Duplex Steel S32750 Stud Bolts
Physical properties are important for engineers to understand how the material will react to temperature changes and electrical conductivity in a system.
|
Physical Property |
Value |
|
Density (kg/m^3) |
7810 |
|
Magnetic Permeability |
33 |
|
Young’s Modulus (N/mm²) |
199 × 10³ |
|
Specific Heat, 20°C (J.Kg-1.K-1) |
475 |
|
Fracture Toughness, Kq (MPa · m) |
475 |
|
Specific Electrical Resistance, 20°C (µΩ.m) |
0.80 |
|
Thermal Conductivity, 20°C |
0.80 |
|
Mean Coefficient of Thermal Expansion |
11.1 × 10⁻⁶ |
Dimension Chart Of Super Duplex Steel S32750 Stud Bolts
Dimensions usually follow ASME B18.31.2 or DIN 976. The length is measured from the first thread to the last thread.
|
Nominal Size (Fraction) |
Decimal |
UNC |
UNF |
Minimum Threaded Length ≤ 6" |
Minimum Threaded Length > 6" |
Head Width Across Flats (Basic) |
Head Width Across Corners (Avg) |
Head Height (Basic) |
|
1/2 |
0.5000 |
13 |
20 |
1 1/4 |
1 1/2 |
3/4 |
55/64 |
5/16 |
|
9/16 |
0.5625 |
12 |
18 |
1 3/8 |
1 5/8 |
13/16 |
59/64 |
23/64 |
|
5/8 |
0.6250 |
11 |
18 |
1 1/2 |
1 3/4 |
15/16 |
1 1/16 |
25/64 |
|
3/4 |
0.7500 |
10 |
16 |
1 3/4 |
2 |
1 1/8 |
1 9/32 |
15/32 |
|
7/16 |
0.4375 |
14 |
20 |
1 1/8 |
1 3/8 |
5/8 |
45/64 |
9/32 |
|
1 1/8 |
1.1250 |
7 |
12 |
2 1/2 |
2 3/4 |
1 11/16 |
1 29/32 |
11/16 |
|
1 1/4 |
1.2500 |
7 |
12 |
2 3/4 |
3 |
1 7/8 |
2 7/64 |
25/32 |
|
1 3/8 |
1.3750 |
6 |
12 |
3 |
3 1/4 |
2 1/16 |
2 21/64 |
27/32 |
|
7/8 |
0.8750 |
9 |
14 |
2 |
2 1/4 |
1 5/16 |
1 31/64 |
35/64 |
|
1 |
1.0000 |
8 |
12 |
2 1/4 |
2 1/2 |
1 1/2 |
1 45/64 |
39/64 |
|
1/4 |
0.2500 |
20 |
28 |
3/4 |
1 |
7/16 |
1/2 |
5/32 |
|
5/16 |
0.3125 |
18 |
24 |
7/8 |
1 1/8 |
1/2 |
9/16 |
13/64 |
|
3/8 |
0.3750 |
16 |
24 |
1 |
1 1/4 |
9/16 |
41/64 |
15/64 |
|
1 1/2 |
1.5000 |
6 |
12 |
3 1/4 |
3 1/2 |
2 1/4 |
2 17/32 |
15/16 |
Size Chart of Super Duplex Steel S32750 Stud Bolts
Sizes are available in both metric and imperial measurements. Stockists usually carry standard sizes but can cut and thread custom lengths to suit.
|
Size (Metric) |
Size (Imperial) |
Common Lengths (mm) |
|
M10 |
3/8" |
50, 75, 100, 150 |
|
M12 |
1/2" |
60, 80, 100, 120 |
|
M16 |
5/8" |
80, 100, 150, 200 |
|
M20 |
3/4" |
100, 150, 200, 250 |
|
M24 |
1" |
120, 180, 240, 300 |
Torque Charts of Super Duplex Steel S32750 Stud Bolts
Torque values depend on the lubricant used and the desired preload. These figures are approximate for bolts in a clean, lubricated condition.
|
Nominal Dia (in) |
Threads/in |
Torque ft-lb (Dry) |
Torque ft-lb (Lubricated) |
|
1/2" |
13 |
65.6 |
49.1 |
|
1/2" |
20 |
73.9 |
55.4 |
|
1" |
8 |
560 |
420 |
|
1" |
14 |
628 |
471 |
|
1-1/4" |
7 |
975 |
730 |
|
1-1/4" |
12 |
1079 |
809 |
|
9/16" |
12 |
94.5 |
71.0 |
|
9/16" |
18 |
105.5 |
79.1 |
|
5/16" |
18 |
15.1 |
11.4 |
|
5/16" |
24 |
16.8 |
12.6 |
|
3/4" |
10 |
232 |
174 |
|
3/4" |
16 |
258 |
194 |
|
1/4" |
20 |
7.4 |
5.5 |
|
1/4" |
28 |
8.4 |
6.3 |
|
7/8" |
9 |
373 |
280 |
|
7/8" |
14 |
412 |
309 |
|
3/8" |
16 |
26.9 |
20.2 |
|
3/8" |
24 |
30.4 |
22.8 |
|
1-1/2" |
6 |
1696 |
1271 |
|
1-1/2" |
12 |
1908 |
1430 |
|
7/16" |
14 |
43.0 |
32.3 |
|
7/16" |
20 |
48.0 |
36.0 |
|
5/8" |
11 |
130.5 |
97.9 |
|
5/8" |
18 |
147.8 |
110.9 |
Key Features of Super Duplex Steel S32750 Stud Bolts
These fasteners offer a specific set of advantages that make them suitable for harsh conditions. They are chosen where more economical materials, such as 316 stainless steel, would probably fail in a short period of time.
- High Corrosion Resistance
- Superior Strength
- Stress Corrosion Cracking Resistance
- Good Weldability
- Erosion Resistance
Applications of Super Duplex Steel S32750 Stud Bolts
These bolts are used across several heavy industries where safety and longevity are the main priorities. They are typically found in systems that handle aggressive fluids or gases.
- Offshore Platforms
- Desalination Plants
- Chemical Processing
- Marine Engineering
- Pulp and Paper Industry
How to Choose the Right Super Duplex Steel S32750 Stud Bolts Supplier?
When it comes to super duplex steel S32750 stud bolts, you need a partner who understands the technical demands of the material. If the material is not heat-treated properly during manufacturing, the corrosion resistance can be compromised.
Supplier Selection Criteria
Look for a supplier with a proven track record in supplying super duplex fasteners. You should ask how long they have been working with S32750. Check if they keep a steady stock or if everything is made to order. A good supplier should be able to provide technical data sheets and help with sizing questions. It is also useful if they have in-house testing facilities to verify the hardness and dimensions of the bolts before they are shipped to your site.
Technical Considerations
The supplier should be aware of the PREN (Pitting Resistance Equivalent Number). For S32750, it should be above 40. Ask them what annealing temperature they use in their manufacturing process. If temperature is not controlled, intermetallic phases such as sigma can form, making the bolts brittle. You want a supplier who can explain how they avoid these issues during the threading and heading processes.
Quality & Certification Check
Never buy super duplex stud bolts without a Mill Test Certificate (MTC). This document should be to EN 10204 3.1 or 3.2 standards. It proves the chemical and mechanical properties of the exact batch you are buying. You should also check for ISO 9001 certification. If the bolts are for offshore use, see if the supplier is approved by bodies like NORSOK or has PED (Pressure Equipment Directive) compliance. These certifications give you confidence that the bolts will not fail in the field.
Procurement Tips for Bulk Orders
When ordering in bulk, always ask for a sample first, so you can check the quality of the thread and fit with nuts. Be specific about packaging to avoid damage during transit, as deep scratches can be a site for corrosion. It’s often best to order the nuts and washers from the same supplier to ensure that the material grades are an exact match. This avoids galvanic corrosion. Try to negotiate a fixed price for a specific period if you have a long-term project, as the price of super duplex can be volatile.
Super Duplex Steel S32750 stud bolts are high-performance fasteners for harsh environments. These bolts are 25% chromium, 4% molybdenum, and 7% nickle. This specific combination provides them with a dual-phase microstructure of austenite and ferrite. You get the strength of ferritic steel and the corrosion resistance of austenitic steel in one part. In the industry, these are often called Grade 2507 fasteners. They are used primarily in offshore oil and gas, desalination plants, and chemical processing because they handle chloride-induced stress corrosion cracking very well.
Price of Super Duplex Steel S32750 Stud Bolts
The Super Duplex Steel S32750 Stud Bolts price varies based on raw material market rates and the complexity of the specific fastener dimensions you need for your project.
Approx Price Range
The price varies with the current price of nickel and molybdenum on the world market, both of which are key materials of the S32750 alloy.
Price Per Unit / Kg
A standard M16 x 100mm stud bolt might cost anywhere from ₹1,400-1,498/kg and ₹180 to ₹3,157 per piece. Buying per kilogramme is usually more cost-effective for large-scale industrial procurement and bulk piping projects.
Factors Affecting Price
Several things change the final cost. These include the size of the order, the complexity of the threading requirements, any special coating or surface finishes requested, and the current availability of high-grade raw material stock.
Types of Super Duplex Steel S32750 Stud Bolts
You will find several different configurations of these stud bolts depending on how they need to be installed.
- S32750 Fully Threaded Stud Bolts
- S32750 Tap End Stud Bolts
- S32750 Double End Stud Bolts
- S32750 Flange Stud Bolts
- S32750 Reduced Shank Stud Bolts
Specifications of Super Duplex Steel S32750 Stud Bolts
Standard specifications ensure that the bolts meet the safety requirements for high-pressure and corrosive environments. Most manufacturers follow these common international standards.\
|
Feature |
Details |
|
Standard |
ASTM A182, A479, ASME B18.31.2 |
|
Size Range |
M6 to M100 or 1/4" to 4" |
|
Length |
20mm to 5000mm |
|
Threads |
METRIC, UN, UNC, UNF, BSW |
|
Tolerance |
+/- 0.01mm to 0.05mm |
|
Finish |
Plain, Zinc Plated, Hot Dip Galvanised, PTFE Coated |
Chemical Properties of Super Duplex Steel S32750 Stud Bolts
The chemical composition is what makes these bolts perform better than standard duplex. The high PREN (Pitting Resistance Equivalent Number) value is a direct result of these specific elements.
|
Element |
Composition |
|
Grade |
S32750 |
|
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) |
24.00 – 26.00 |
|
Nickel (Ni) |
6.00 – 8.00 |
Mechanical Properties Super Duplex Steel S32750 Stud Bolts
These bolts have very high yield strength compared to 300-series stainless steel. This allows for lighter designs because you can use smaller bolts to achieve the same clamping force.\
|
Mechanical Property |
Value |
|
0.2% Proof Stress (N/mm²) [ksi] minimum |
550 [79.8] |
|
Tensile Strength (N/mm²) [ksi] minimum |
800 [116] |
|
Elongation (%) minimum |
25 |
|
Hardness (HBN) |
270 max |
|
Reduction of Cross-Section Area (%) |
45 |
Physical Properties Super Duplex Steel S32750 Stud Bolts
Physical properties are important for engineers to understand how the material will react to temperature changes and electrical conductivity in a system.
|
Physical Property |
Value |
|
Density (kg/m^3) |
7810 |
|
Magnetic Permeability |
33 |
|
Young’s Modulus (N/mm²) |
199 × 10³ |
|
Specific Heat, 20°C (J.Kg-1.K-1) |
475 |
|
Fracture Toughness, Kq (MPa · m) |
475 |
|
Specific Electrical Resistance, 20°C (µΩ.m) |
0.80 |
|
Thermal Conductivity, 20°C |
0.80 |
|
Mean Coefficient of Thermal Expansion |
11.1 × 10⁻⁶ |
Dimension Chart Of Super Duplex Steel S32750 Stud Bolts
Dimensions usually follow ASME B18.31.2 or DIN 976. The length is measured from the first thread to the last thread.
|
Nominal Size (Fraction) |
Decimal |
UNC |
UNF |
Minimum Threaded Length ≤ 6" |
Minimum Threaded Length > 6" |
Head Width Across Flats (Basic) |
Head Width Across Corners (Avg) |
Head Height (Basic) |
|
1/2 |
0.5000 |
13 |
20 |
1 1/4 |
1 1/2 |
3/4 |
55/64 |
5/16 |
|
9/16 |
0.5625 |
12 |
18 |
1 3/8 |
1 5/8 |
13/16 |
59/64 |
23/64 |
|
5/8 |
0.6250 |
11 |
18 |
1 1/2 |
1 3/4 |
15/16 |
1 1/16 |
25/64 |
|
3/4 |
0.7500 |
10 |
16 |
1 3/4 |
2 |
1 1/8 |
1 9/32 |
15/32 |
|
7/16 |
0.4375 |
14 |
20 |
1 1/8 |
1 3/8 |
5/8 |
45/64 |
9/32 |
|
1 1/8 |
1.1250 |
7 |
12 |
2 1/2 |
2 3/4 |
1 11/16 |
1 29/32 |
11/16 |
|
1 1/4 |
1.2500 |
7 |
12 |
2 3/4 |
3 |
1 7/8 |
2 7/64 |
25/32 |
|
1 3/8 |
1.3750 |
6 |
12 |
3 |
3 1/4 |
2 1/16 |
2 21/64 |
27/32 |
|
7/8 |
0.8750 |
9 |
14 |
2 |
2 1/4 |
1 5/16 |
1 31/64 |
35/64 |
|
1 |
1.0000 |
8 |
12 |
2 1/4 |
2 1/2 |
1 1/2 |
1 45/64 |
39/64 |
|
1/4 |
0.2500 |
20 |
28 |
3/4 |
1 |
7/16 |
1/2 |
5/32 |
|
5/16 |
0.3125 |
18 |
24 |
7/8 |
1 1/8 |
1/2 |
9/16 |
13/64 |
|
3/8 |
0.3750 |
16 |
24 |
1 |
1 1/4 |
9/16 |
41/64 |
15/64 |
|
1 1/2 |
1.5000 |
6 |
12 |
3 1/4 |
3 1/2 |
2 1/4 |
2 17/32 |
15/16 |
Size Chart of Super Duplex Steel S32750 Stud Bolts
Sizes are available in both metric and imperial measurements. Stockists usually carry standard sizes but can cut and thread custom lengths to suit.
|
Size (Metric) |
Size (Imperial) |
Common Lengths (mm) |
|
M10 |
3/8" |
50, 75, 100, 150 |
|
M12 |
1/2" |
60, 80, 100, 120 |
|
M16 |
5/8" |
80, 100, 150, 200 |
|
M20 |
3/4" |
100, 150, 200, 250 |
|
M24 |
1" |
120, 180, 240, 300 |
Torque Charts of Super Duplex Steel S32750 Stud Bolts
Torque values depend on the lubricant used and the desired preload. These figures are approximate for bolts in a clean, lubricated condition.
|
Nominal Dia (in) |
Threads/in |
Torque ft-lb (Dry) |
Torque ft-lb (Lubricated) |
|
1/2" |
13 |
65.6 |
49.1 |
|
1/2" |
20 |
73.9 |
55.4 |
|
1" |
8 |
560 |
420 |
|
1" |
14 |
628 |
471 |
|
1-1/4" |
7 |
975 |
730 |
|
1-1/4" |
12 |
1079 |
809 |
|
9/16" |
12 |
94.5 |
71.0 |
|
9/16" |
18 |
105.5 |
79.1 |
|
5/16" |
18 |
15.1 |
11.4 |
|
5/16" |
24 |
16.8 |
12.6 |
|
3/4" |
10 |
232 |
174 |
|
3/4" |
16 |
258 |
194 |
|
1/4" |
20 |
7.4 |
5.5 |
|
1/4" |
28 |
8.4 |
6.3 |
|
7/8" |
9 |
373 |
280 |
|
7/8" |
14 |
412 |
309 |
|
3/8" |
16 |
26.9 |
20.2 |
|
3/8" |
24 |
30.4 |
22.8 |
|
1-1/2" |
6 |
1696 |
1271 |
|
1-1/2" |
12 |
1908 |
1430 |
|
7/16" |
14 |
43.0 |
32.3 |
|
7/16" |
20 |
48.0 |
36.0 |
|
5/8" |
11 |
130.5 |
97.9 |
|
5/8" |
18 |
147.8 |
110.9 |
Key Features of Super Duplex Steel S32750 Stud Bolts
These fasteners offer a specific set of advantages that make them suitable for harsh conditions. They are chosen where more economical materials, such as 316 stainless steel, would probably fail in a short period of time.
- High Corrosion Resistance
- Superior Strength
- Stress Corrosion Cracking Resistance
- Good Weldability
- Erosion Resistance
Applications of Super Duplex Steel S32750 Stud Bolts
These bolts are used across several heavy industries where safety and longevity are the main priorities. They are typically found in systems that handle aggressive fluids or gases.
- Offshore Platforms
- Desalination Plants
- Chemical Processing
- Marine Engineering
- Pulp and Paper Industry
How to Choose the Right Super Duplex Steel S32750 Stud Bolts Supplier?
When it comes to super duplex steel S32750 stud bolts, you need a partner who understands the technical demands of the material. If the material is not heat-treated properly during manufacturing, the corrosion resistance can be compromised.
Supplier Selection Criteria
Look for a supplier with a proven track record in supplying super duplex fasteners. You should ask how long they have been working with S32750. Check if they keep a steady stock or if everything is made to order. A good supplier should be able to provide technical data sheets and help with sizing questions. It is also useful if they have in-house testing facilities to verify the hardness and dimensions of the bolts before they are shipped to your site.
Technical Considerations
The supplier should be aware of the PREN (Pitting Resistance Equivalent Number). For S32750, it should be above 40. Ask them what annealing temperature they use in their manufacturing process. If temperature is not controlled, intermetallic phases such as sigma can form, making the bolts brittle. You want a supplier who can explain how they avoid these issues during the threading and heading processes.
Quality & Certification Check
Never buy super duplex stud bolts without a Mill Test Certificate (MTC). This document should be to EN 10204 3.1 or 3.2 standards. It proves the chemical and mechanical properties of the exact batch you are buying. You should also check for ISO 9001 certification. If the bolts are for offshore use, see if the supplier is approved by bodies like NORSOK or has PED (Pressure Equipment Directive) compliance. These certifications give you confidence that the bolts will not fail in the field.
Procurement Tips for Bulk Orders
When ordering in bulk, always ask for a sample first, so you can check the quality of the thread and fit with nuts. Be specific about packaging to avoid damage during transit, as deep scratches can be a site for corrosion. It’s often best to order the nuts and washers from the same supplier to ensure that the material grades are an exact match. This avoids galvanic corrosion. Try to negotiate a fixed price for a specific period if you have a long-term project, as the price of super duplex can be volatile.
Super Duplex Steel S32750 Stud Bolts Suppliers
Super Duplex Steel S32750 Stud Bolts FAQ's
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