Super Duplex Steel S32760 Flanges

Super Duplex Steel S32760 Flanges are forged from UNS S32760, a high-alloy duplex grade with roughly 25% chromium, 7% nickel, 3.5% molybdenum, and added tungsten and cobalt. This composition gives the alloy a PREN (Pitting Resistance Equivalent Number) above 40, one of the highest among commercial duplex grades. These flanges are applicable in chloride-rich, acidic, high-pressure environments where conventional stainless steel is not successful. They are most frequently applied in oil and gas, chemical processing, and seawater handling industries. They meet ASTM A182 and ASME B16.5 requirements and are available in all standard face types and pressure classes.

Price of Super Duplex Steel S32760 Flanges

The approximate price range of Super Duplex Steel S32760 Flanges per kg/unit is given below, along with the factors affecting the final cost.

Approx Price Range

Flanges are made from forgings and bars and therefore cost more than raw bar stock. The indicative price of UNS S32760 flanges from Indian suppliers ranges from Rs 800 to Rs 1,250. Prices will vary with size, pressure class, face type, and order quantity.

Price Per Unit

The price range of Super Duplex Steel S32760 Flanges per unit roughly costs ₹750 – ₹5,500+ per piece, depending upon size, type, and pressure rating.

Factors Affecting Price

Raw material cost, order quantity, size, pressure class, and current nickel and molybdenum market rates all directly affect the final price of UNS S32760 flanges.

Types of UNS S32760 Flanges

S32760 flanges are available in several face and end configurations. Each type is suited to different piping connection requirements. The right choice depends on operating pressure, joint type, and the mating flange on the other side.

Super Duplex S32760 Weld Neck Flanges
Super Duplex S32760 Slip-On Flanges
Super Duplex S32760 Blind Flanges
Super Duplex S32760 Socket Weld Flanges
Super Duplex S32760 Threaded Flanges
Super Duplex S32760 Lap Joint Flanges
Super Duplex S32760 Orifice Flanges

Super Duplex S32760 Flanges Specifications

The following table covers the standard specifications applicable to UNS S32760 flanges, including grade, size range, and pressure class.

Parameter	Details
Material Standard	ASTM A182 / ASME SA182
Grade	F55 / UNS S32760
Dimensional Standard	ASME B16.5, ASME B16.47
Pressure Class	150 to 2500
Size Range	1/2" to 60"
Facing Types	RF, FF, RTJ, BW
Manufacturing Process	Forged

Chemical Composition of Super Duplex Steel S32760

The alloy's strength and corrosion resistance come directly from its chemical balance. Tungsten and cobalt are additions that set S32760 apart from other super duplex grades like S32750.

Element	% Composition
Chromium (Cr)	24.0 to 26.0
Nickel (Ni)	6.0 to 8.0
Molybdenum (Mo)	3.0 to 4.0
Tungsten (W)	0.5 to 1.0
Copper (Cu)	0.5 to 1.0
Nitrogen (N)	0.2 to 0.3
Carbon (C)	0.03 max
Manganese (Mn)	1.00 max
Silicon (Si)	1.00 max
Iron (Fe)	Balance

Mechanical Properties of UNS S32760 Flanges

The dual-phase microstructure of S32760 gives it both high strength and good toughness, a combination that is rare in single-phase stainless grades.

Property	Value
Tensile Strength	750 MPa (min)
Yield Strength (0.2% offset)	550 MPa (min)
Elongation	25% (min)
Hardness (Brinell)	270 HB (max)

Physical Properties of ASTM A182 F55 Flanges

These values describe how the material behaves in terms of heat transfer, density, and thermal response.

Property	Value
Density	7.8 g/cm³
Melting Point	1,350°C approx
Thermal Conductivity	14 W/m·K
Specific Heat Capacity	500 J/kg·K
Electrical Resistivity	0.85 µΩ·m
Modulus of Elasticity	200 GPa

Dimension Chart of Super Duplex Steel S32760 Flanges

The table below lists standard dimensions for Class 150 and Class 300 weld neck flanges in S32760.

NPS (inch)	OD (mm)	Bolt Circle (mm)	No. of Bolts	Bolt Size
1/2	89	60.5	4	M12
1	108	79.4	4	M12
2	152	120.7	4	M16
3	191	152.4	4	M16
4	229	190.5	8	M16
6	279	241.3	8	M20
8	343	298.5	8	M20
10	406	362.0	12	M24
12	483	431.8	12	M24

Size Chart of UNS S32760 Flanges

Standard size availability for S32760 flanges covers a wide range to suit most industrial piping systems.

Standard	Size Range	Pressure Class
ASME B16.5	1/2" to 24"	150 to 2500
ASME B16.47 Series A	26" to 60"	75 to 900
ASME B16.47 Series B	26" to 60"	75 to 900

Pressure Rating Chart of Super Duplex Steel Flanges (UNS S32760)

Pressure ratings for S32760 flanges follow ASME B16.5 standards. The values below are at ambient temperature (38°C).

Pressure Class	Max Allowable Pressure (bar)
Class 150	19.6
Class 300	51.1
Class 600	102.1
Class 900	153.2
Class 1500	255.3
Class 2500	425.5

Key Features of Super Duplex Steel S32760 Flanges

The 7 important features of Super Duplex Steel S32760 Flanges are listed below in detail.

PREN above 40, giving outstanding resistance to pitting and crevice corrosion in chloride environments.
Roughly twice the yield strength of standard austenitic grades like 316L.
Good resistance to stress corrosion cracking (SCC) in wet, sour service conditions.
Works reliably at temperatures from -50°C up to around 300°C.
Low thermal expansion relative to austenitic steels minimises the risk of distortion.
It is resistant to corrosion and cavitation, making it ideal for flow-heavy pipelines.
Certified to NACE MR0175 / ISO 15156 for sour service use in the oil and gas sector.

Applications of UNS S32760 / ASTM A182 F55 Flanges

S32760 flanges are used wherever the combination of high strength, chloride resistance, and pressure integrity is needed. Below are the main industries and use cases.

Oil and Gas
Seawater Systems
Chemical Processing
Pulp and Paper
Desalination Plants
Power Generation

How to Choose the Right Super Duplex Steel S32760 Flange Supplier?

To choose the right Super Duplex Steel S32760 Flanges, follow the steps mentioned below.

Supplier Selection Criteria

Look for suppliers who stock mill test certificates (MTCs) for every heat of S32760 material. The certificate should show chemical analysis and mechanical test results against ASTM A182 requirements. Verify that the forging process is documented and that heat treatment records are available on request.

Technical Considerations

Order with the facing type and pressure class of your choice. S32760 Flanges are usually specified with a raised face (RF) as standard, but depending on your service conditions, you may need a ring joint (RTJ) or a flat face (FF). Check that the bore matches your pipe schedule.

Quality and Certification Check

Ask for third-party inspection reports where possible. Relevant certifications include EN 10204 3.1 or 3.2, NACE MR0175 compliance documentation, and, where applicable, DNV or Lloyd’s Register approval for offshore use.

Procurement Tips for Bulk Orders

Request a material traceability report showing the heat number for each flange for large orders. S32760 is a specialist alloy and can therefore be forged to order. Negotiate lead times ahead of time. Check the packaging and preservation requirements for offshore or seawater locations.