Super Duplex Steel S32750 Flanges

Super Duplex Steel S32750 Flanges are pipe connection components manufactured from UNS S32750, a super duplex stainless steel with chromium (24–26%), molybdenum (3–5%), and nitrogen (0.24–0.32%). These flanges conform to ASTM A182 F53, the standard material designation for super duplex flanges to ASME B16.5 and B16.47. ASTM A182 F53 UNS S32750 delivers a pitting resistance equivalent number (PREN) exceeding 42, making these flanges the standard specification for offshore, desalination, and high-chloride chemical service, where duplex 2205 has insufficient corrosion resistance.

Super Duplex Steel S32750 Flanges offer approximately 2.5 times the yield strength of standard 316L austenitic flanges. A182 F53 material specification requires flanges to be supplied in the solution-annealed and water-quenched condition with full mechanical and chemical testing, ensuring consistent performance across the full corrosion resistance and strength profile of the grade.

Price of Super Duplex Steel S32750 Flanges

High molybdenum and nitrogen content and regional need for high-strength offshore-grade piping components drive the market value of Super Duplex Steel S32750 Flanges.

Approx Price Range

Super Duplex Steel S32750 Flanges range from ₹2,500 to ₹60,000 per piece, depending on size, pressure class, and flange type. Large-diameter and high-pressure class flanges in this grade sit at the upper end of the range.

Price Per Unit / Kg

Super Duplex Steel S32750 Flanges Price in the Indian market ranges from ₹2,200 to ₹5,500 per kg. Prices are based on international pricing, with reference to LME nickel and molybdenum prices. S32750 is priced at a premium versus normal duplex 2205 due to its greater chromium, nitrogen, and molybdenum content.

Factors Affecting Price

High chromium (24–26%), molybdenum (3–5%), and nitrogen content are the primary cost drivers above standard duplex. Pressure class, size, facing type, and ASTM A182 F53 certification all affect pricing. Super Duplex Steel S32750 Flanges Suppliers with full MTC documentation, price at a premium over uncertified stock.

Types of Super Duplex Steel S32750 Flanges

The following are the different types of Duplex Steel S32750 Flanges available in the market.

Weld Neck Flanges (WN)
Slip-On Flanges (SO)
Blind Flanges (BL)
Socket Weld Flanges (SW)
Threaded Flanges (TH)
Lap Joint Flanges (LJ)
Long Weld Neck Flanges (LWN)
Orifice Flanges
Reducing Flanges
Spectacle Blind Flanges
Ring Type Joint (RTJ) Flanges

Specifications of Super Duplex Steel S32750 Flanges

The specifications of Super Duplex Steel S32750 Flanges, including size, standard, and pressure class, are listed in the table below.

Parameter	Details
Grade	Super Duplex S32750 / UNS S32750 / 1.4410
Standards	ASTM A182 F53 / ASME B16.5 / ASME B16.47
Pressure Class	Class 150 / 300 / 600 / 900 / 1500 / 2500
Size Range	1/2" NB to 60" NB (Custom sizes available)
Facing Type	RF, FF, RTJ, MF, TG
Form	Forged / Custom

Chemical Properties of Super Duplex Steel S32750 Flanges

The following table shows the chemical composition of Super Duplex Steel S32750 Flanges as per the specifications of A182 F53 chemical composition.

Grade	C	Mn	Si	P	S	Cr	Mo	Ni	N
S32750 Min	—	—	—	—	—	24.0	3.0	6.0	0.24
S32750 Max	0.03	1.2	0.8	0.035	0.020	26.0	5.0	8.0	0.32

Mechanical Properties of Super Duplex Steel S32750 Flanges

The mechanical properties of Super Duplex Steel S32750 Flanges, including tensile strength, yield strength, and elongation, are listed below.

Property	Value
Tensile Strength	800 MPa min
Yield Strength (0.2% Offset)	550 MPa min
Elongation (% in 50 mm)	15% min
Hardness (Brinell)	310 HB max

Physical Properties of Super Duplex Steel S32750 Flanges

The physical properties of Super Duplex Steel S32750 Flanges are listed in the table below, along with density and thermal conductivity.

Grade	Density (kg/m³)	Elastic Modulus (GPa)	Mean Co-eff of Thermal Expansion (µm/m/°C) 0–100°C	Thermal Conductivity (W/m.K) at 100°C	Specific Heat (J/kg.K)	Elec Resistivity (nΩ.m)
S32750	7800	200	13.0	17.0	480	800

Dimension Chart of Super Duplex Steel S32750 Flanges

Review the Super Duplex Steel S32750 flanges dimensions chart given below.

NB Size	OD of Flange (mm)	Bolt Circle Dia (mm)	No. of Bolts	Bolt Size	Flange Thickness (mm)
1/2"	88.9	60.3	4	M14	11.2
1"	108.0	79.4	4	M14	14.3
2"	152.4	120.7	4	M18	19.1
3"	190.5	152.4	4	M18	23.9
4"	228.6	190.5	8	M18	23.9
6"	279.4	241.3	8	M22	25.4
8"	342.9	298.5	8	M22	28.5
10"	406.4	362.0	12	M25	30.2
12"	482.6	431.8	12

Dimensions per ASME B16.5 Class 150. Confirm dimensions for higher pressure classes with your supplier.

Size Chart of Super Duplex Steel S32750 Flanges

Refer to the following size and standard chart for Super Duplex Steel S32750 flanges to select the appropriate configuration for your specific piping diameter and pressure requirements.

Flange Type	Size Range (NB)	Pressure Class	Dimensional Standard
Weld Neck (WNRF)	1/2" – 24"	Class 150 – 2500	ASME B16.5
Slip-On (SORF)	1/2" – 24"	Class 150 – 1500	ASME B16.5
Blind (BLRF)	1/2" – 24"	Class 150 – 2500	ASME B16.5
Socket Weld (SWRF)	1/2" – 3"	Class 150 – 1500	ASME B16.5
Threaded (NPT)	1/2" – 4"	Class 150 – 2500	ASME B16.5
Lap Joint (LJ)	1/2" – 24"	Class 150 – 2500	ASME B16.5
Large Diameter	26" – 60"	Class 150 – 900	ASME B16.47 Series A & B

Pressure Rating Chart of Super Duplex Steel S32750 Flanges

Review the following comprehensive pressure ratings and dimensional data for Super Duplex Stainless Steel UNS S32750 flanges to ensure safe operation across varying temperature ranges and pressure classes.

Temperature °F	Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500
-20 to 100	275	720	960	1440	2160	3600	6000
200	230	600	800	1200	1800	3000	5000
300	205	540	720	1080	1620	2700	4500
400	190	495	660	995	1490	2485	4140
500	170	465	620	930	1395	2330	3880
600	140	435	580	875	1310	2185	3640
700	110	425	565	850	1275	2125	3540
800	80	405	540	805	1210	2015	3360
900	50	390	520	780	1165	1945	3240
1000	20	320	430

Pressure ratings per ASME B16.5 for Group 3.1 (UNS S32750 / F53). Always verify with the relevant ASME table for your exact service temperature.

Key Features of Super Duplex Steel S32750 Flanges

Kindly check the following key features that define Grade S32750 as the gold standard for extreme offshore and high-pressure subsea applications.

Elite Pitting Resistance (PREN > 42)
Extreme Yield Strength
Chloride SCC Immunity
Sour Service Compliance
Dual-Phase Magnetic Profile
Stringent Testing Standards
Thermal Stability
Global NORSOK Certification

Applications of Super Duplex Steel S32750 Flanges

Explore the specialised industrial environments where Super Duplex S32750 flanges are utilised for their immense strength and resistance to the most aggressive chloride-rich conditions.

Offshore & Subsea Piping
Subsea Manifold Assemblies
Desalination RO Systems
Chloride-Rich Chemical Processing
Power Plant FGD Systems
Marine Seawater Cooling
Pulp & Paper Bleaching
Coastal Infrastructure

How to Choose the Right Super Duplex Steel S32750 Flanges Supplier?

Please consider the following pointers to make sure your procurement is as per the requirements of your project.

Supplier Selection Criteria

Verify the supplier provides mill test certificates with full heat and lot traceability confirming UNS S32750 composition and PREN. S32750 is frequently substituted with duplex 2205 or S31803 by unverified traders, who check chromium (24–26%) and nitrogen (0.24–0.32%) on the MTC. Always request EN 10204 3.1 as a minimum; EN 10204 3.2 is required for NORSOK and offshore specifications.

Technical Considerations

Confirm flange standard and pressure class before ordering. Check supplier quotations against ASTM A182 F53 UNS S32750 to ASME B16.5, not generic "super duplex". Check NACE MR0175 hardness for sour service. A182 F53 requires impact testing and hardness restrictions; check the MTC.

Quality & Certification Check

We are the supplier of Super Duplex Steel S32750 Flanges approved by ISO 9001:2015, and third-party inspection is done by SGS, BV, TUV, or DNV. Verify the availability of MDS D47 documentation for NORSOK projects. All flanges shall be supplied in the solution-annealed and water-quenched state. Heat treatment certificates are included in each documentation package.

Procurement Tips for Bulk Orders

All UNS S32750 Flanges requirements, kinds, sizes, and pressure classes consolidated with one professional supplier for easier MTC management and better cost negotiation. A qualified supplier by the vendor for the supply to the project reduces repetitive verification of the quality. Review MTCs and price from two to three suppliers to validate ASTM A182 F53 UNS S32750 chemistry and benchmark current market pricing for first-time purchase.