Super Duplex S32760 Round Bar
Super Duplex Steel S32760 Round Bar Manufacturer, Supplier & Exporter in India
Stellar Alloys Steel Pipe & Tubes manufactures and stocks Super Duplex S32760 (UNS S32760 / F55) round bars with the highest pitting resistance (PREN >40) among duplex stainless steels. Our ISO 9001:2015 certified manufacturing facility produces ASTM A276 and ASTM A479 compliant bars with full EN 10204 3.1 material certification. With tungsten and copper additions, S32760 delivers exceptional resistance to chloride-induced corrosion, outperforming S32750 and S32205 in seawater, chemical processing, and offshore applications. We maintain ready stock from 6mm to 800mm diameter with same-week delivery across India and 2-3 week export to Middle East, Southeast Asia, and Europe.
S32760 round bars are engineered for critical applications requiring superior corrosion resistance in chloride environments above 10,000 ppm, including offshore platform structural components, subsea equipment fasteners, chemical reactor internals, desalination plant pump shafts, FGD scrubber systems, and seawater cooling system piping. The material’s critical pitting temperature (CPT) exceeds 50°C in 1M FeCl₃, providing reliable performance where S32205 and S31803 grades fail. NACE MR0175/ISO 15156 compliant for sour service applications.
Our Super Duplex Steel UNS S32760 Round Bars are available in multiple forms such as bright bars, black bars, forged bars, polished bars, hex bars, flat bars, square bars, threaded bars, and rods. We supply these products in customized dimensions, thicknesses, and specifications as per client requirements.
Table of Contents
- Super Duplex S32760 Round Bar Specification
- Types of Super Duplex S32760 Round Bars
- Super Duplex S32760 Round Bars Chemical Composition
- Mechanical Properties of UNS S32760 Round Bars
- Welding Guidelines for S32760 Round Bars
- Heat Treatment Specifications
- Physical Properties of Super Duplex S32760 Round Bars
- Corrosion Resistance Performance
- Critical Corrosion Performance Data
- Benefits of High PREN Value in S32760
- Features of Super Duplex S32760 Round Bars
- Applications of Super Duplex Steel S32760 Round Bars
- Available Forms & Finishes
- Super Duplex S32760 Round Bar Equivalent Grades
- Super Duplex S32760 Round Bar Price List in India
- S32760 vs S32750 vs S32205 - Material Selection Guide
- Factors Affecting Super Duplex S32760 Round Bar Price
- Manufacturing Credentials & Quality Certifications
- Testing & Quality Standards
- International Standards & Specifications
- Packaging Details
- Why Choose Steel Pipe & Tubes?
- Ready Stock Availability & Order Information
- Related Products
- FAQs About Super Duplex S32760 Round Bar
What is Super Duplex S32760 Round Bar?
Super Duplex S32760 Round Bar is a high-alloy stainless steel product containing chromium, nickel, molybdenum, nitrogen, tungsten, and copper. This duplex microstructure combines ferritic and austenitic properties, offering high tensile strength and superior corrosion resistance in aggressive environments.
The material is commonly identified under:
- UNS S32760
- ASTM A276 S32760
- ASTM A479 S32760
- ASME SA276 S32760
- F55 Round Bar
Super Duplex S32760 is specially designed for demanding industrial applications where high mechanical strength and resistance to seawater corrosion are required.
Super Duplex S32760 Round Bar Specification
Specification | Details |
Material Grade | UNS S32760 |
Common Name | Super Duplex Steel F55 |
Standards | ASTM A276 / ASTM A479 / ASME SA276 / SA479 |
Diameter Range | 3 mm to 800 mm |
Forms | Round Bar, Rod, Hex Bar, Flat Bar, Square Bar |
Finish | Bright, Black, Polished, Hot Rolled, Cold Drawn |
Length | 1 Meter to 6 Meter |
Condition | Annealed, Pickled, Bright Drawn |
Tolerance | H8, H9, H10, H11 |
Available Shapes | Round, Square, Hex, Rectangle, Billet |
Certification | EN 10204 3.1 / Mill Test Certificate |
Types of Super Duplex S32760 Round Bars
ASTM A276 Super Duplex S32760 Bright Bar
UNS S32760 Black Round Bar
Super Duplex S32760 Forged Bar
Super Duplex Steel S32760 Hex Bar
Super Duplex Steel S32760 Hex Bar
Super Duplex S32760 Polished Bar
- ASTM A276 Super Duplex S32760 Bright Bar
Bright bars offer superior surface finish and dimensional accuracy for precision industrial applications. - UNS S32760 Black Round Bar
Black bars are widely used for heavy-duty engineering and structural applications. - Super Duplex S32760 Forged Bar
Forged bars provide excellent mechanical properties and high-pressure resistance. - Super Duplex Steel S32760 Hex Bar
Hex bars are used in fasteners, valves, and precision machining applications. - S32760 Flat Bar
Flat bars are suitable for fabrication, structural support, and industrial processing equipment. - Super Duplex S32760 Polished Bar
Polished bars are preferred for decorative and hygienic industrial applications.
Super Duplex S32760 Round Bars Chemical Composition
Element | Composition (%) |
Carbon (C) | 0.030 max |
Chromium (Cr) | 24.0 – 26.0 |
Nickel (Ni) | 6.0 – 8.0 |
Molybdenum (Mo) | 3.0 – 4.0 |
Nitrogen (N) | 0.20 – 0.30 |
Manganese (Mn) | 1.0 max |
Silicon (Si) | 1.0 max |
Sulfur (S) | 0.010 max |
Phosphorus (P) | 0.030 max |
Copper (Cu) | 0.50 – 1.0 |
Tungsten (W) | 0.50 – 1.0 |
Mechanical Properties of UNS S32760 Round Bars
Property | Value |
Tensile Strength | 750 MPa min |
Yield Strength | 550 MPa min |
Elongation | 25% min |
Hardness | 270 HB max |
Density | 7.8 g/cm³ |
Welding Guidelines for S32760 Round Bars
Alloy steel round bars are available in a wide variety of sizes depending on industrial requirements. Typical sizes include:
- Diameter: 6 mm to 500 mm
- Length: 3 meters to 6 meters
- Finish options: Hot Rolled, Bright Bar, Cold Drawn
- Shape: Round Bar / Alloy Steel Rods
Custom sizes and lengths can also be manufactured based on specific project requirements.
Heat Treatment Specifications
S32760 round bars are supplied in solution annealed condition per ASTM A276. Heat treatment parameters:
- Solution Annealing Temperature: 1040-1100°C (1900-2010°F)
- Holding Time: Minimum 30 minutes at temperature for sections up to 50mm
- Cooling: Rapid cooling (water quench or forced air) from solution annealing temperature
- WARNING: Do not hold in 300-1000°C range during cooling (promotes sigma phase formation)
Physical Properties of Super Duplex S32760 Round Bars
Property | Value |
Density | 7.8 g/cm³ |
Melting Range | 1350°C – 1450°C |
Modulus of Elasticity | 200 GPa |
Thermal Conductivity | 14 W/m.K |
Electrical Resistivity | 0.80 µΩ·m |
Specific Heat Capacity | 480 J/kg.K |
Magnetic Permeability | Slightly Magnetic |
Thermal Expansion | 13.0 µm/m°C |
Corrosion Resistance Performance
Super Duplex S32760 Round Bars offer exceptional resistance against pitting, crevice corrosion, chloride stress corrosion cracking, and aggressive chemical environments. The superior corrosion resistance of UNS S32760 is measured using the Pitting Resistance Equivalent Number (PREN), which indicates the alloy’s ability to resist localized corrosion in chloride-containing environments.
The PREN formula is:
PREN=%Cr+3.3(%Mo)+16(%N)PREN = \%Cr + 3.3(\%Mo) + 16(\%N)PREN=%Cr+3.3(%Mo)+16(%N)
For Super Duplex S32760 with approximate composition values:
Chromium (Cr) = 25%
Molybdenum (Mo) = 3.5%
Nitrogen (N) = 0.25%
The PREN calculation becomes:
PREN=25+3.3(3.5)+16(0.25)=40.55PREN = 25 + 3.3(3.5) + 16(0.25) = 40.55PREN=25+3.3(3.5)+16(0.25)=40.55
A PREN value greater than 40 provides outstanding resistance to localized corrosion and makes Super Duplex S32760 superior to many duplex stainless steel grades including:
S32750 with PREN approximately 38
S32205 with PREN approximately 35
The tungsten addition of 0.5% to 1.0% further improves resistance to reducing acids, pitting corrosion, and crevice corrosion in highly aggressive environments.
Critical Corrosion Performance Data
Corrosion Property | Performance |
Critical Pitting Temperature (CPT) | >50°C in 1M FeCl₃ solution (ASTM G48) |
Chloride Stress Corrosion Cracking | Excellent resistance up to 250°C in 25% NaCl |
Crevice Corrosion Resistance | No attack in seawater up to 40°C |
Uniform Corrosion Rate | <0.1 mm/year in seawater applications |
Sulfide Stress Cracking | Compliant with NACE MR0175 / ISO 15156 |
Hydrogen Sulfide (H₂S) Service | Suitable up to 250°C |
Seawater Resistance | Excellent |
Acid Resistance | High resistance to sulfuric and organic acids |
Benefits of High PREN Value in S32760
Superior resistance to seawater corrosion
Excellent performance in offshore and marine applications
Reduced maintenance and operational costs
Enhanced service life in chloride-rich environments
Better resistance compared to standard duplex stainless steels
Improved protection against pitting and crevice attack
Super Duplex S32760 Round Bars are widely preferred in offshore oil & gas platforms, desalination plants, marine structures, chemical processing industries, and heat exchangers where extreme corrosion resistance and long-term reliability are essential.
Our stainless steel round bars serve mission-critical applications across multiple industries due to their exceptional strength, corrosion resistance, and reliability in harsh environments:
Common applications include:
- Oil and Gas Industry – Downhole pump shafts, valve stems, instrumentation components, and wellhead equipment
- Chemical Processing Plants – Reactor vessel shafts, agitator components, pump impellers, and corrosion-resistant fasteners
- Marine and Offshore Structures – Propeller shafts, deck equipment, rigging hardware, and saltwater-resistant fittings
- Automotive and Mechanical Engineering – Engine components, transmission shafts, precision machined parts, and suspension elements
- Pump and Valve Manufacturing – Valve stems, pump shafts, piston rods, and high-pressure fittings
- Construction and Structural Frameworks – Architectural supports, railing systems, and load-bearing structural members
- Food Processing Equipment – Mixer shafts, conveyor components, sanitary fittings, and hygienic processing machinery
- Aerospace Components – Landing gear parts, high-strength fasteners, precision machined aircraft components
Features of Super Duplex S32760 Round Bars
- Excellent resistance to pitting and crevice corrosion
- High tensile and yield strength
- Outstanding resistance to chloride stress corrosion cracking
- Superior weldability and machinability
- Excellent durability in marine environments
- High resistance against chemical corrosion
- Long service life with low maintenance
Applications of Super Duplex Steel S32760 Round Bars
Super Duplex S32760 Round Bars are extensively used in:
- Offshore Oil & Gas: Platform structural bracing, subsea wellhead components, high-pressure manifolds, control line fittings, riser clamps where seawater corrosion and high strength are critical (typically 25mm-100mm diameter round bars machined to specification)
- Chemical Processing: Agitator shafts for chlorinated solvents, reactor vessel internal components, pump shafts handling >10,000 ppm chloride solutions, heat exchanger tube sheets for acidic/chloride mixtures (common sizes: 40mm-150mm diameter)
- Desalination Plants: High-pressure pump shafts (50mm-80mm), valve stems, seawater intake screen fasteners, brine circulation piping supports where pitting resistance >50°C is required
- Marine & Shipbuilding: Propeller shafts, rudder stocks, seawater cooling system components, ballast tank fasteners, deck equipment in splash zones (10mm-200mm round bar stock)
- FGD Systems: Scrubber internals, spray header components, mist eliminator support structures in flue gas desulfurization where chloride concentration reaches 15,000-25,000 ppm
- Pulp & Paper: Bleaching equipment shafts, digester components handling chlorine dioxide and chlorinated liquors at elevated temperatures
Available Forms & Finishes
Forms | Finishes |
Round Bars | Bright Finish |
Flat Bars | Black Finish |
Hex Bars | Polished Finish |
Square Bars | Hot Rolled |
Forged Bars | Cold Drawn |
Threaded Bars | Annealed & Pickled |
Super Duplex S32760 Round Bar Equivalent Grades
Standard | Grade |
UNS | S32760 |
Werkstoff No | 1.4501 |
ASTM | A276 S32760 |
EN | X2CrNiMoCuWN25-7-4 |
Common Name | F55 |
Super Duplex S32760 Round Bar Price List in India
Product Description | Size Range | Finish | Price (Approx.) |
Super Duplex S32760 Round Bar | 10 mm – 100 mm | Bright | ₹850 – ₹1250 per kg |
UNS S32760 Black Round Bar | 20 mm – 300 mm | Black | ₹800 – ₹1150 per kg |
ASTM A276 S32760 Bright Bar | 6 mm – 80 mm | Bright Polished | ₹900 – ₹1300 per kg |
Super Duplex F55 Forged Bar | 50 mm – 500 mm | Forged | ₹950 – ₹1450 per kg |
S32760 Hex Bar | 10 mm – 70 mm | Bright | ₹900 – ₹1350 per kg |
Super Duplex S32760 Flat Bar | Custom Sizes | Hot Rolled | ₹850 – ₹1200 per kg |
S32760 vs S32750 vs S32205 - Material Selection Guide
Selecting the correct duplex grade is critical for application performance and cost optimization. S32760 (F55) provides the highest corrosion resistance but at premium cost. Here’s how to choose:
Grade Comparison Table:
Property | S32760 (F55) | S32750 (F53) | S32205 (F51) |
PREN Value | 40-42 | 38-40 | 33-35 |
Max Chloride | 25,000+ ppm | 20,000 ppm | 10,000 ppm |
Critical Pitting Temp | >50°C | >45°C | >35°C |
Max Service Temp | 250°C | 250°C | 280°C |
Tensile Strength | 750 MPa min | 700 MPa min | 620 MPa min |
Relative Cost | Highest (100%) | Medium (85%) | Lowest (70%) |
Best Application | Offshore/subsea, high chloride | Marine, moderate chemical | General chemical, moderate seawater |
When to Choose S32760:
- Chloride concentration >10,000 ppm
- Operating temperature >40°C in seawater
- Offshore and subsea applications below 250°C
- Where S32750 or S32205 have history of pitting/crevice corrosion
- NACE MR0175 sour service compliance required
Factors Affecting Super Duplex S32760 Round Bar Price
The price of Super Duplex S32760 Round Bars depends on multiple factors including:
- Raw material cost
- Nickel and molybdenum market rates
- Bar size and dimensions
- Finish type
- Quantity ordered
- Manufacturing process
- Custom machining requirements
- Export packaging and testing
Manufacturing Credentials & Quality Certifications
As an ISO 9001:2015 and PED 2014/68/EU certified super duplex steel manufacturer, Stellar Alloys operates state-of-the-art facilities with PMI testing, ultrasonic inspection, and mechanical testing laboratories. Our S32760 round bars undergo 100% material verification and are supplied with full EN 10204 3.1 mill test certificates. We are approved suppliers to ONGC, IOCL, and major EPC contractors for offshore and petrochemical projects.
Our Certifications & Approvals:
- ISO 9001:2015 Quality Management System
- PED 2014/68/EU Pressure Equipment Directive
- NORSOK M-650 Rev.3 Material Data Sheets
- NACE MR0175/ISO 15156 Sour Service Compliance
- EN 10204 3.1 Mill Test Certificate (all products)
- Third-party inspection accepted (SGS, TUV, Lloyds, DNV-GL)
Manufacturing Capabilities: 25+ years manufacturing super duplex alloys | Annual capacity 500+ tonnes | Export to 35+ countries | In-house PMI, ultrasonic, and tensile testing | Custom machining and cutting services | Stock holding 100+ tonnes ready inventory
Testing & Quality Standards
All Super Duplex S32760 Round Bars undergo strict quality testing including:
- PMI Testing
- Hardness Testing
- Ultrasonic Testing
- Mechanical Testing
- Chemical Analysis
- Intergranular Corrosion Testing
- Third Party Inspection
International Standards & Specifications
Standard | Description |
ASTM A276 | Stainless Steel Bars & Shapes |
ASTM A479 | Stainless Steel Bars for Pressure Vessels |
ASME SA276 | Stainless Steel Bar Specification |
EN 10088 | Stainless Steel Standards |
NORSOK MDS D45 | Offshore Material Standard |
Packaging Details
Super Duplex Steel S32760 Round Bars are packed using:
- Wooden Boxes
- Export Quality Bundles
- Plastic Wrapped Packaging
- Bubble Wrapped Protection
- End Cap Protection
- Fumigation Wooden Cases for Export Shipments
Why Choose Steel Pipe & Tubes?
- High-quality tested material
- Ready stock availability
- Competitive prices
- Fast delivery worldwide
- Third-party inspection available
- Customized cutting and machining
- Export packaging standards
- Experienced global supplier
Ready Stock Availability & Order Information
- In-Stock Inventory: We maintain 100+ tonnes of S32760 round bars in popular sizes (10mm-200mm) for immediate dispatch. Custom sizes 6mm-800mm available on 2-3 week manufacturing lead time.
- Delivery Capabilities: Same-week delivery across India (Mumbai, Delhi, Chennai, Ahmedabad, Kolkata). Export shipments to Middle East (7-10 days), Southeast Asia (10-14 days), Europe (14-18 days) via air or sea freight.
- Payment Terms: Letter of Credit (LC), advance payment, or credit terms for established customers. Accept multiple currencies (INR, USD, EUR, AED).
- Quality Assurance: All materials supplied with EN 10204 3.1 mill test certificates. Third-party inspection (SGS, TUV, Bureau Veritas, Lloyds, DNV-GL) welcome at our facility or before shipment. PMI testing, ultrasonic testing, and mechanical testing reports included.
- Custom Services: Precision cutting, machining, threading, heat treatment, and surface finishing available. Provide your drawings for quotation.
Related Products
- Super Duplex S32750 Round Bars
- Duplex Steel S32205 Round Bars
- Inconel Round Bars
- Monel Round Bars
- Hastelloy Round Bars
- Stainless Steel Bright Bars
- Nickel Alloy Bars
FAQs About Super Duplex S32760 Round Bar
Super Duplex S32760 Round Bar is a high-strength stainless steel bar with superior corrosion resistance and excellent mechanical properties used in harsh industrial environments.
ASTM A276 S32760 is the standard specification covering stainless steel bars and shapes for Super Duplex Steel UNS S32760 material.
UNS S32760 is the material designation for Super Duplex stainless steel containing chromium, nickel, molybdenum, and nitrogen.
These bars are used in offshore platforms, marine equipment, chemical plants, pressure vessels, and desalination systems.
S32760 (F55) has higher PREN (40-42 vs 38-40) due to tungsten addition (0.5-1% W) and slightly higher Mo content. This provides superior pitting resistance in chloride >15,000 ppm and higher critical pitting temperature (>50°C vs >45°C). S32750 is adequate for most marine applications; S32760 is specified for extreme offshore, subsea, and high-chloride chemical processing where maximum corrosion resistance is critical.
Yes, S32760 is compliant with NACE MR0175/ISO 15156 for sour service (H₂S environments) up to 250°C (482°F) and hardness below 35 HRC. Material must be solution annealed and rapidly cooled to meet compliance. Mill test certificates should specify NACE compliance when required for oil & gas applications.
Yes, S32760 maintains excellent resistance to pitting and crevice corrosion in seawater up to 80°C due to its high PREN (>40) and tungsten content. Critical pitting temperature exceeds 50°C in ferric chloride solution. For comparison, S32205 and S32750 are limited to lower temperatures in seawater applications.
Offshore projects typically require EN 10204 3.1 or 3.2 mill test certificates, NORSOK M-650 material data sheets, DNV-GL or ABS material approval certificates, and NACE MR0175/ISO 15156 compliance documentation for sour service. We supply S32760 round bars with complete offshore-grade certification packages.