Super Duplex Steel Flanges

The super duplex stainless steel flanges, also known as 'super duplex flanges', are high-end flanges that have been fabricated from an austenitic-ferritic duplex steel. The chemical composition includes 25% chromium, 7% nickel, 4% molybdenum, and trace additions of nitrogen and tungsten. These flanges have a PREN (Pitting Resistance Equivalent Number) of 40 or above, with a minimum tensile strength of 750 MPa, a yield strength of 550 MPa, and an elongation of 15%; these flanges outperform standard duplex and austenitic grades. Primary applications include offshore oil and gas systems, chemical processing pipelines, marine engineering structures, and desalination plants.

Super Duplex Stainless Steel Flanges prices

The Super duplex stainless steel flanges' prices vary based on grade, size, pressure class, and order quantity. Below are the factors that influence the price.

Approximate Price Range

The price range for super duplex steel flanges is Rs 940 to Rs 1,500 per kg. The overall cost depends on the actual grade used and the specifications of the flanges.

Factors Affecting Price:

The grade composition is the most important factor affecting the price of stainless steel seamless tubing, with alloys that have a higher percentage of chromium, molybdenum, or nickel being more expensive due to the raw material costs. Wall thickness adds material weight per running meter, so heavier sections cost more per piece even at the same grade. The higher the schedule and the larger the outside diameter, the more material and machining are necessary, thus increasing the price. The surface finish requirements (bright annealing, mirror polish, or high grit finish) also increase processing cost, and the same applies to third-party test certificates or non-standard cut lengths. Order quantity is also a factor, since bulk or large distributors are not charged the same as a spot buyer for smaller quantities.

Super Duplex Stainless Steel Flange Grades

The Super duplex steel flanges are offered in 5 key grades with different alloy compositions and PREN values for various service requirements. Choose a grade according to operating conditions, chemical composition, and pressure class.

Super Duplex Steel S32750 Flanges
Super Duplex Steel 2507 Flanges
Super Duplex Steel S32760 Flanges
Super Duplex Steel Ferralium 255 Flanges
Super Duplex Steel Zeron 100 Flanges

Types of Super Duplex Flanges

The Super duplex flanges are produced in 9 standard connection configurations, each designed for specific installation requirements, pressure ratings, and piping layouts.

Weld Neck Flanges (WNRF)
Slip-On Flanges (SORF)
Blind Flanges (BLRF)
Socket Weld Flanges (SWRF)
Ring Type Joint Flanges (RTJ)
Lap Joint Flanges
Threaded Flanges
Orifice Flanges
Spectacle Blind Flanges

Super Duplex Flanges Specifications

All super duplex steel flanges manufactured and supplied are tested and documented against the parameters listed below. Dimensional and material compliance is verified to ASTM A182 and ASME B16.5 before dispatch.

Parameter	Specification
Material Standard	ASTM A182 / ASME SA182
Common Grades	F53 (UNS S32750), F55 (UNS S32760)
Dimensional Standards	ASME B16.5, ASME B16.47, MSS SP-44, EN 1092-1
Size Range	DN15 (1/2") to DN1200 (48")
Pressure Ratings	Class 150 to Class 2500
Flange Types	Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, Orifice, Spectacle Blind, Reducing
Face Types	Raised Face, Flat Face, Ring Type Joint
Tensile Strength	750 to 950 MPa; some grades up to 1000 MPa
Yield Strength	Around 550 to 650 MPa; commonly 550 MPa minimum
Elongation	15% minimum
Hardness	Rockwell C 32 max
PREN	40 to 43, and in some cases 40 to 45+
Density	7,800 kg/m3
Melting Point	About 1350°C / 2460°F
Typical Applications	Marine, offshore, chemical, high-corrosion, and pressure piping systems

Super Duplex Stainless Steel Flange Size Chart

The size chart below covers weld neck flange dimensions from 1/2" NPS to 24" NPS, conforming to ASME B16.5 Class 150. For Class 300 and above or sizes beyond 24", contact us for certified dimensional drawings.

NPS / DN	OD Flange	Thickness	Hub Dia.	RF Dia.	Hub Length (Y)	Bolt Circle Dia.	Bolt Hole Dia.	No. Bolts	Bolt Size	Approx. Wt.
1/2" / 15 NB	89.0 mm	11.2 mm	30.2 mm	35.1 mm	15.7 mm	60.5 mm	15.8 mm	4	1/2"	0.4 kg
3/4" / 20 NB	98.5 mm	12.7 mm	38.1 mm	42.9 mm	15.7 mm	69.9 mm	15.8 mm	4	1/2"	0.7 kg
1" / 25 NB	108.0 mm	14.2 mm	49.3 mm	50.8 mm	17.5 mm	79.3 mm	15.8 mm	4	1/2"	0.8 kg
1 1/4" / 32 NB	117.5 mm	15.7 mm	58.7 mm	63.5 mm	20.6 mm	88.9 mm	15.8 mm	4	1/2"	1.2 kg
1 1/2" / 40 NB	127.0 mm	17.5 mm	65.0 mm	73.2 mm	22.4 mm	98.6 mm	15.8 mm	4	1/2"	1.5 kg
2" / 50 NB	152.5 mm	19.1 mm	77.7 mm	91.9 mm	25.4 mm	120.7 mm	19.1 mm	4	5/8"	2.3 kg
2 1/2" / 65 NB	178.0 mm	22.4 mm	90.4 mm	104.6 mm	28.4 mm	139.7 mm	19.1 mm	4	5/8"	3.7 kg
3" / 80 NB	190.5 mm	23.9 mm	108.0 mm	127.0 mm	30.2 mm	152.4 mm	19.1 mm	4	5/8"	4.1 kg
3 1/2" / 90 NB	216.0 mm	23.9 mm	122.2 mm	139.7 mm	31.8 mm	177.8 mm	19.1 mm	8	5/8"	5.1 kg
4" / 100 NB	228.5 mm	23.9 mm	134.9 mm	157.2 mm	33.3 mm	190.5 mm	19.1 mm	8	5/8"	5.9 kg
5" / 125 NB	254.0 mm	23.9 mm	163.6 mm	185.7 mm	36.6 mm	215.9 mm	22.4 mm	8	3/4"	7.0 kg
6" / 150 NB	279.5 mm	25.4 mm	192.0 mm	215.9 mm	39.6 mm	241.3 mm	22.4 mm	8	3/4"	8.4 kg
8" / 200 NB	343.0 mm	28.4 mm	246.1 mm	269.7 mm	44.5 mm	298.5 mm	22.4 mm	8	3/4"	13.0 kg
10" / 250 NB	406.5 mm	30.2 mm	304.8 mm	323.9 mm	49.3 mm	362.0 mm	25.4 mm	12	7/8"	18.0 kg
12" / 300 NB	482.5 mm	31.8 mm	365.3 mm	381.0 mm	55.6 mm	431.8 mm	25.4 mm	12	7/8"	29.0 kg
14" / 350 NB	533.5 mm	35.1 mm	400.1 mm	412.8 mm	57.2 mm	476.3 mm	28.5 mm	12	1"	39.0 kg
16" / 400 NB	597.0 mm	36.6 mm	457.2 mm	469.9 mm	63.5 mm	539.8 mm	28.5 mm	16	1"	47.0 kg
18" / 450 NB	635.0 mm	39.6 mm	505.0 mm	533.4 mm	68.3 mm	577.9 mm	31.8 mm	16	1 1/8"	57.0 kg
20" / 500 NB	698.5 mm	42.9 mm	558.8 mm	584.2 mm	73.2 mm	635.0 mm	31.8 mm	20	1 1/8"	76.0 kg
24" / 600 NB	813.0 mm	47.8 mm	663.4 mm	692.2 mm	82.6 mm	749.3 mm	35.1 mm	20	1 1/4"	97.0 kg

Schedule Chart of Super Duplex Stainless Steel Flange

The pressure-temperature rating chart below applies to super duplex flanges manufactured per ASME B16.5. All values are in PSI (pounds per square inch). Ratings reduce with increasing temperature. Confirm operating parameters against the relevant pressure class before specification.

Temp (°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	640	965	1605	2675
1050	20	310	410	615	925	1545	2570
1100	20	255	345	515	770	1285	2145
1150	20	200	265	400	595	995	1655
1200	20	155	205	310	465	770	1285
1250	20	115	150	225	340	565	945
1300	20	85	115	170	255	430	715
1350	20	60	80	125	185	310	515
1400	20	50	65	95	145	240	400
1450	15	35	45	70	105	170	285
1500	10	25	35	55	80	135	230

Key Features of Super Duplex Flanges

Super duplex flanges deliver 9 performance characteristics that make them the preferred choice over standard austenitic and duplex grades in demanding piping systems.

High Strength
Corrosion Resistance
Good Ductility
High Toughness
Cost-Effectiveness
Temperature Resistance
Abrasion and Erosion Resistance
Good Weldability
Design Flexibility

Applications of Super Duplex Stainless Steel Flange

Super duplex flanges are specified across 9 major industries where high corrosion resistance, elevated pressure ratings, and long service life are non-negotiable requirements.

Oil and Gas Industry
Chemical Processing Plants
Marine Engineering
Power Generation Plants
Desalination Plants
Pulp and Paper Industry
Water Treatment Systems
Petrochemical Industry
Hydrocarbon Processing Units

How to Choose the Right Super Duplex SS Flange Supplier and Manufacturer?

The safety and cost of procuring such materials directly depend on choosing the appropriate super duplex flange supplier. There are four important aspects you need to consider before deciding on a supplier.

Selecting The Right Supplier And Manufacturer

Make sure the manufacturer holds valid Mill Test Reports (MTRs) to ASTM A182 / ASME SA182. Third-party inspection certifications from TUV, BV, or DNV GL indicate a supplier capable of meeting international quality benchmarks.

Technical Considerations

Verify that the supplier stocks or produces the exact grade you need, S32750 (F53) or S32760 (F55), in the required size range and pressure class. Confirm the dimensional standard (ASME B16.5, B16.47, or EN 1092-1) matches your project specification. Mismatches in face finish type, Raised Face vs. ring-type joint, are one of the most common procurement errors.

Evaluating Supplier Credibility

Refer to similar industry projects for references. A good super duplex flange supplier has its own QA department, PMI testing done on request, and test results certified by NABL or ISO 17025 standards. Before placing any order, compare the delivery time with your project timelines.

Procurement Strategy

If the project includes phases of delivery, consider negotiating a consignment stock or warehouse agreement to avoid any sudden increase in the cost of purchase due to the current market price. The super duplex steel flange unit cost is reduced by bulk purchasing on a confirmed BOM (Bill of Materials), and heat consistency is ensured throughout all flange connections.