 Stainless Steel Flanges Manufacturer & Supplier.webp)
Super Duplex 32760 (Zeron 100) Stainless Steel Flanges Manufacturer & Supplier
Metinox Overseas manufactures and supplies Super Duplex 32760 Stainless Steel Flanges (Zeren 100) which is the best grade of Flanges that will be used in the most severe conditions of corrosion needs maximum strength and buildup of resistance to pitting, crevice corrosion, and stress corrosion cracking. UNS S32760 Forged Flanges is fabricated by using ultra-premium super duplex stainless steel with improved chemical compositions with chromium (24.0-26.0%), nickel (6.0-8.0%), molybdenum (3.0-4.0%), tungsten (0.50-1.00%), and copper (0.50-1.00%), which provide minimum tensile strength of 750 Mpa, yield strength of 550 Mpa, These Zeron 100 Super Duplex 32760 Flanges are made with equal portions of ferritic-austenitic with tungsten and copper additions which gives them the highest localized corrosion resistance of any duplex stainless steel including super duplex 2507, thus they are ideal in severe offshore oil and gas, high-temperature seawater systems, chemical processing with concentrated chlorides, desalination brine sections, pulp and paper high-temperature bleach plants, and the most corrosive environments where even
The special additions of copper (0.5-1.0%) and tungsten (0.5-1.0%) to the 25Cr-7Ni-3Mo-N base alloy give excellent crevice corrosion resistance and performance at high temperature seawater (up to 100degC). We make our Super Duplex 32760 Weld Neck Flanges, Slip-On Flanges, Blind Flanges, and Socket Weld Flanges in full compliance to ANSI/ASME B16.5 (1/2 to 24 NB) and ASME B16.47 Series A and B (26 to 60 NB) dimensional specifications and in pressure classes of 150 to 600 pounds. All flanges are subjected to a required annealing of solutions in 1040-1100 degC and then rapidly water-quench, and have been subjected to extensive testing of quality, including dimensional inspection, PMI verification, ferrite content measurement, critical pitting temperature testing (CPT >70 degC required), intergranular corrosion testing, and ultrasonic examination requirements in ASTM A961.
Table of Contents
- Super Duplex 32760 Flanges Technical Specifications
- Super Duplex 32760 Equivalent Grades
- Super Duplex 32760 Chemical Composition
- Mechanical Properties of Super Duplex 32760 Flanges
- Super Duplex 32760 Flange Dimensions & Pressure Rating Chart
- Types of Super Duplex 32760 Flanges Available
- Standard Flange Sizes & Weight Chart
- Is Super Duplex 32760 Good Quality for Severe Offshore Service?
- Heat Treatment & Testing Requirements
- Super Duplex 32760 Flanges Price List 2026
- Applications of Super Duplex 32760 Flanges in Industry
- Why Choose Super Duplex 32760 Flanges from Metinox Overseas?
- Super Duplex 32760 Flange Delivery Time & CIF Pricing by Country
- Other Types of Super Duplex 32760 Flanges
- Popular Locations Where We Supply Super Duplex 32760 Flanges
- Frequently Asked Questions (FAQ)
Super Duplex 32760 Flanges Technical Specifications
| Feature | Details |
| Specifications | ASTM A182 / ASME SA182 / ASTM A240 / MSS SP-44 / NORSOK M-650 |
| Grade | 32760 / Zeron 100 (Enhanced Super Duplex) |
| UNS Number | S32760 |
| EN Number | 1.4501 |
| Werkstoff Nr. | X2CrNiMoWCuN25-7-4 |
| Dimensional Standards | ANSI/ASME B16.5, B16.47 Series A & B, B16.48, MSS SP-44 |
| Size Range | 1/2" (15 NB) to 60" (1500 NB) |
| Pressure Class | 150#, 300#, 600# (higher classes available on request) |
| Microstructure | Duplex (40-60% Ferrite, Balance Austenite) |
| Flange Types | Weld Neck, Slip-On, Blind, Socket Weld, Lap Joint, Threaded, Orifice, Long Weld Neck |
| Flange Face | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Male & Female, Tongue & Groove |
| Manufacturing Type | Hot Forged, Solution Annealed & Quenched |
| Heat Treatment | Solution Annealing at 1040-1100-C, Rapid Water Quenching (Mandatory) |
| Testing | Tensile, Hardness, PMI, Ferrite, IGC, CPT (>70-C), ASTM G48, Ultrasonic |
| Inspection | Third Party Inspection by TUV, SGS, Bureau Veritas, Lloyd's, DNV GL, BV, ABS |
| Certifications | EN 10204 3.1B/3.2 MTC, NACE MR0175, NORSOK M-650, PED 2014/68/EU, CE, ASME B31.3 |
Super Duplex 32760 Equivalent Grades
| STANDARD | USA | GERMANY | EUROPE | SWEDEN | FRANCE | TRADE NAME |
| 32760 | UNS S32760 ASTM A182 |
1.4501 X2CrNiMoWCuN25-7-4 |
EN 1.4501 | - | - | Zeron 100 Ferralium 255 |
Note: "Zeron 100" is the Rolled Alloys trade name, "Ferralium 255" is Langley Alloys trade name. S32760 is the UNS designation.
Super Duplex 32760 Chemical Composition
The detailed composition of this material is given in the following table.
| Element | Composition (%) | Function |
| Carbon (C) | 0.030 max | Low carbon for corrosion resistance |
| Manganese (Mn) | 1.00 max | Austenite stabilizer |
| Phosphorus (P) | 0.030 max | Controlled for corrosion resistance |
| Sulfur (S) | 0.010 max | Strictly minimized for corrosion |
| Silicon (Si) | 1.00 max | Deoxidizer |
| Chromium (Cr) | 24.0 - 26.0 | Passivation, pitting resistance |
| Nickel (Ni) | 6.0 - 8.0 | Austenite stabilization, corrosion resistance |
| Molybdenum (Mo) | 3.0 - 4.0 | Pitting and crevice corrosion resistance |
| Tungsten (W) | 0.50 - 1.00 | Enhanced crevice corrosion resistance (key addition) |
| Copper (Cu) | 0.50 - 1.00 | Superior sulfuric acid resistance (key addition) |
| Nitrogen (N) | 0.20 - 0.30 | Strength, pitting resistance, austenite stabilization |
| Iron (Fe) | Balance | Base metal |
Note: PREN (Pitting Resistance Equivalent Number) = %Cr + 3.3(%Mo + 0.5%W) + 16(%N) - 42-45, highest among duplex grades. W and Cu additions distinguish 32760 from 2507.
Mechanical Properties of Super Duplex 32760 Flanges
The mechanical properties decide the shelflife of the material. The table below gives the information about the mechanical properties of Super Duplex 32760 Flanges.
| Property | Requirement | Testing Standard |
| Tensile Strength | 750 MPa (109 ksi) minimum | ASTM A370 |
| Yield Strength (0.2% offset) | 550 MPa (80 ksi) minimum | ASTM A370 |
| Elongation in 2" | 25% minimum | ASTM A370 |
| Hardness (Rockwell C) | 32 HRC max (=302 HB) | ASTM E18 |
| Hardness (Brinell) | =302 HB typical | ASTM E10 |
| Ferrite Content | 40 - 60% (balance austenite) | ASTM E562 / Feritscope |
| Impact Energy (Charpy V) | 60 J min at -40-C | ASTM A370 |
Note: Mechanical properties similar to 2507 but with significantly superior corrosion resistance due to W and Cu additions.
Super Duplex 32760 Flange Dimensions & Pressure Rating Chart
Pressure-Temperature Ratings for Super Duplex 32760 Flanges
| Temperature -F (-C) | Class 150 | Class 300 | Class 600 |
|---|---|---|---|
| -20 to 100 (-29 to 38) | 285 psi | 740 psi | 1480 psi |
| 200 (93) | 260 psi | 675 psi | 1350 psi |
| 300 (149) | 240 psi | 625 psi | 1250 psi |
| 400 (204) | 220 psi | 575 psi | 1150 psi |
| 500 (260) | 205 psi | 535 psi | 1070 psi |
Note: Maximum recommended service temperature 300-C (572-F). 32760 excels in high-temperature chloride environments up to 100-120-C where 2507 is marginal.
Types of Super Duplex 32760 Flanges Available
Super Duplex 32760 Orifice Flange
Super Duplex 32760 Threaded Flange
Super Duplex 32760 Reducing Flange
Super Duplex 32760 Lap Joint Flange
Super Duplex 32760 Long Weld Neck Flange
Super Duplex 32760 Socket Weld Flange
Super Duplex 32760 Weld Neck Flange
Super Duplex 32760 Blind Flange
Super Duplex 32760 Slip-On Flange
Standard Flange Sizes & Weight Chart
Super Duplex 32760 Weld Neck Flange Dimensions (ANSI B16.5) - Class 150 Sample
| NPS | Outside Diameter (mm) | Thickness (mm) | Bore (mm) | Hub Dia (mm) | Bolt Circle (mm) | No. of Bolts | Bolt Dia | Approx Weight (kg) |
|---|---|---|---|---|---|---|---|---|
| 1/2" | 90 | 11 | 21 | 35 | 60 | 4 | M12 | 0.51 |
| 1" | 108 | 13 | 33 | 50 | 79 | 4 | M12 | 0.97 |
| 2" | 152 | 16 | 60 | 75 | 121 | 4 | M16 | 2.02 |
| 4" | 229 | 19 | 114 | 127 | 190 | 8 | M16 | 6.05 |
| 6" | 267 | 21 | 168 | 184 | 229 | 8 | M19 | 9.65 |
| 8" | 330 | 24 | 219 | 238 | 286 | 8 | M19 | 16.3 |
| 10" | 406 | 27 | 273 | 305 | 362 | 12 | M22 | 26.9 |
| 12" | 483 | 29 | 324 | 346 | 432 | 12 | M22 | 40.4 |
| 16" | 597 | 32 | 419 | 448 | 546 | 16 | M25 | 71.9 |
| 20" | 699 | 38 | 508 | 559 | 648 | 20 | M25 | 109.0 |
| 24" | 813 | 44 | 610 | 651 | 756 | 20 | M32 | 168.0 |
Is Super Duplex 32760 Good Quality for Severe Offshore Service?
Yes, Super Duplex 32760 (Zeron 100) at the top of the duplex stainless steel technology is the best corrosion resistant duplex in the duplex family, which is offered in the most demanding offshore, seawater, and chemical processing application. This special tungsten (0.5-1.0%) and copper (0.5-1.0%) additions to the 25Cr-7Ni-3Mo-N base composition give it exceptional performance in high temperature seawater and concentrated chloride environments where even the super duplex 2507 will be accelerating.
Introduction of tungsten significantly increases the crevice corrosion resistance by means of creation of tungsten-enriched passive films, and 32760 is especially appropriate in creviced geometries (e.g. flanged connections, valve seats, gasket surfaces) in seawater service. Addition of copper gives it better resistance to sulfuric acid and minimizes the rate of corrosion in reducing acids. These factors combine to drive the PREN up to 42-45 ( vs 40-43 in 2507), which is far beyond the Critical Pitting Temperature (CPT) of 70 o C in ASTM G48 testing- much higher than the CPT of 50-55 o C in 2507.
This high localized corrosion resistance permits 32760 to be used in high temperature sea water up to 100-120 C, concentrated seawater (3.5%+ salinity), desalination evaporator brine and hot chloride process streams where 2507 would be pitting or crevicing. The material is very resistant to chloride SCC at temperatures of over 100C which is way beyond the ability of austenitic stainless steels.
The highest-performance applications, subsea manifolds and pipelines in hot wells, topside process equipment that uses hot produced water with high chlorides, extreme seawater injection systems, over 60 o C, desalination brine heater tubes and evaporator sections, offshore oil and gas production in hot climates, and chemical process equipment that utilizes concentrated high chlorides and temperatures are specified at 32760. It is certified by major oil companies to service severe off-shore and is comparable to Norsok M-650 offshore service.
The high tensile (550 Mpa yield) with the highest level of corrosion resistance allows aggressive reduction of the wall thickness and constant reliability in the most unpleasant conditions. Although 32760 is priced higher than the 2507 (usually 40-60 higher), it is the only duplex offering that is capable of operating above the temperature/chloride ranges of 2507. Although nickel-base alloys (Alloy 625, C-276) or titanium can perform well enough for such an environment, the environment is beyond the capabilities of 32760.
The material of choice in case: seawater temperature is above 80 0 C, crevice corrosion is a major issue in seawater, concentration of chloride is above 100 000 ppm at high temperatures, sulfuric acid resistance is needed (copper content) or service experience of 2507 in seawater is inadequate. The material is an excellent cost-performance at the far side of duplex capability.
Heat Treatment & Testing Requirements
Heat Treatment Process (Mandatory):
Solution Annealing:
- Temperature: 1040-1100-C (1900-2010-F) - higher than 2507
- Holding Time: Adequate soaking based on thickness
- Cooling: Rapid water quenching (absolutely critical)
- Purpose: Dissolve carbides, optimize ferrite-austenite, dissolve W and Cu into solution
- Critical: W and Cu require higher solution annealing temperature (1040-1100-C vs 1020-1080-C for 2507). Rapid quenching essential to prevent precipitation.
Testing Requirements (Comprehensive & Stringent):
- Tensile Testing: Yield =550 MPa, tensile =750 MPa, elongation =25%
- Hardness Testing: =32 HRC (=302 HB)
- Ferrite Content: 40-60% by Feritscope or metallography
- PMI Testing: Verify Cr, Ni, Mo, W (0.5-1.0%), Cu (0.5-1.0%), N
- CPT Testing: ASTM G48 Method A - minimum 70-C required (vs 50-C for 2507)
- IGC Testing: ASTM A262 Practice C (mandatory for critical service)
- ASTM G48 Method B: Crevice corrosion testing at 40-C minimum
- Impact Testing: Charpy at -40-C, minimum 60J for offshore
- Metallographic Examination: Verify no sigma phase, proper W/Cu distribution
- Ultrasonic Testing: Mandatory for offshore critical applications
Super Duplex 32760 Flanges Price List 2026
| Flange Type | Size Range | Pressure Class | Indicative Price Range (USD/Piece) |
|---|---|---|---|
| Weld Neck (WN) | 1/2" - 2" | 150# | $125 - $335 |
| Weld Neck (WN) | 4" - 8" | 150# | $520 - $2,085 |
| Weld Neck (WN) | 10" - 24" | 150# | $3,150 - $11,500 |
| Weld Neck (WN) | 1/2" - 2" | 300# | $185 - $485 |
| Weld Neck (WN) | 4" - 8" | 300# | $810 - $3,180 |
| Weld Neck (WN) | 10" - 24" | 300# | $4,620 - $16,800 |
| Weld Neck (WN) | 1/2" - 2" | 600# | $275 - $715 |
| Weld Neck (WN) | 4" - 8" | 600# | $1,205 - $4,650 |
| Slip-On (SO) | 1/2" - 2" | 150# | $105 - $280 |
| Slip-On (SO) | 4" - 8" | 150# | $435 - $1,750 |
| Slip-On (SO) | 10" - 24" | 150# | $2,620 - $9,600 |
| Blind (BL) | 1/2" - 2" | 150# | $95 - $260 |
| Blind (BL) | 4" - 8" | 150# | $470 - $1,890 |
| Socket Weld (SW) | 1/2" - 2" | 150# - 600# | $140 - $585 |
Note: Super Duplex 32760 flanges are typically 550-700% higher than 316L, 40-60% higher than 2507 due to W and Cu additions, higher solution annealing temperature, and stringent CPT testing requirements.
Applications of Super Duplex 32760 Flanges in Industry
The Super Duplex 32760 (Zeron 100) Flanges are commonly used in many industrial applications, and some of the common industries are given below.
Severe Offshore
Hot produced water systems, high-temperature subsea equipment, deepwater hot wells, severe seawater injection
Desalination (Critical)
Brine heater tubes, evaporator sections, high-temperature brine piping, MSF/MED hot sections
Chemical Processing
Concentrated hot chlorides, mixed acid environments, high-temperature acidic chloride streams
Pulp & Paper
High-temperature bleach plant sections, chlorine dioxide generators at elevated temperatures
Oil & Gas (Severe)
Hot sour gas scrubbing, high-temperature produced water, geothermal applications, enhanced oil recovery
Seawater (High-Temp)
Seawater cooling systems >80-C, hot climate offshore platforms, tropical seawater systems
FGD Systems
High-temperature flue gas desulfurization, absorber sections with hot acidic chlorides
Petrochemical
Severe chloride service, terephthalic acid (PTA/PET) hot sections, acetic acid distillation
Geothermal
Geothermal wells and surface equipment with hot chloride brines
Mining (Severe)
High-temperature acidic heap leach solutions, pregnant leach solutions at elevated temperatures
Why Choose Super Duplex 32760 Flanges from Metinox Overseas?
Metinox Overseas provides certified Super Duplex 32760 (Zeren 100) flanges with optional high-temperature solution annealing, extensive CPT testing over 70O C, and controlled W and Cu content to the highest needs of the worldwide offshore and chemical processing world. Our qualified ISO 9001:2015, NORSOK M-650, and PED-certified plants will guarantee that all 32760 flanges are solution-annealed to an appropriate temperature of 1040-1100 C and then quickly cooled in water with a heat treatment break-even sheet.
All flanges come with EN 10204 3.1B or 3.2 Mill Test Certificates containing complete chemical analysis with Cr (24-26%), Ni (6-8%), Mo (3-4%), W (0.5-1.0%), Cu (0.5-1.0%), N (0.20-0.30%) certified under ferrite content analysis by ICP-OES. Our required testing results are ASTM G48 Method A CPT exceeding 70 o C (far exceeding the requirement of 2507), ASTM G48 Method B crevice testing, IGC testing ASTM A262 Practice C with over 60J in Charpy impact testing at -40 o C and that metallography confirms a proper distribution of W and Cu with no harmful phases.
Our technical team also has extensive experience in the supply of 32760 flanges to severe offshore projects (North Sea high temperature wells, offshore hot wells, Gulf of Mexico load centers, Arabian Gulf), advanced desalination plants, and severe chemical processing, so they provide expert advice on the choice of material between 32760 and 2507 and nickel alloys depending on temperature and chloride severity, welding practices using AWS A5.9 ER2595 or ER385 fillers with stringent heat input control, N
To serve offshore operators who need utmost reliability, desalination EPC contractors in the critical sections, and chemical processors that need harsh chloride environments in more than 60 countries with no compromised quality and at full traceability.
Super Duplex 32760 Flange Delivery Time & CIF Pricing by Country
| Destination Region | Major Ports / Cities | Estimated Delivery Time | Typical CIF Terms |
|---|---|---|---|
| Middle East (GCC) | Dubai, Dammam, Doha | 16-20 Days | CIF Dubai / CIF Dammam |
| Europe | Rotterdam, Hamburg | 30-38 Days | CIF Rotterdam / CIF Hamburg |
| USA & Canada | Houston, New York | 38-48 Days | CIF Houston / CIF New York |
| Southeast Asia | Singapore, Port Klang | 20-28 Days | CIF Singapore / CIF Port Klang |
| Africa | Lagos, Durban | 28-38 Days | CIF Lagos / CIF Durban |
Other Types of Super Duplex 32760 Flanges
Super Duplex 32760 Flanges, Zeron 100 Flanges, UNS S32760 Flanges, 32760 Weld Neck Flanges, 32760 Slip-On Flanges, 32760 Blind Flanges, 32760 Offshore Flanges, 32760 Seawater Flanges, Ferralium 255 Flanges.
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Frequently Asked Questions (FAQ)
32760 has tungsten (0.5-1.0) and copper (0.5-1.0) that will give PREN 42-45 to 2507. CPT >70degC vs 50-55degC high-temperature seawater (80-120degC), extreme crevice conditions, and sulfuric acid 32760 costs 40-60% higher than 2507 but is vital to most extreme applications.
Zeron 100 is the Trade name of the UNS S32760 super duplex stainless steel which is the Rolled Alloys. The name of the Langley Alloys is Ferralium 255. Each of which can be referred to the same material: 25Cr-7Ni-3.5Mo-W-Cu super duplex with PREN >42.
Select 32760 when: seawater temperature exceeds 80degC, crevice corrosion critical (flanges, valves), CPT exceeds 50degC is required, chlorides exceed 100,000 ppm at higher temperature, sulfuric acid resistance is required (Cu content), or when the service history of 2507 indicates sub-par service.
32760 can be operated on continuous seawater operation to 100-120degC (212-248degF) as opposed to 60-80degC of 2507. CPT >70degC gives a high temperature system of seawater a safety margin. At temperatures above 120degC, nickel alloys (Alloy 625, C-276) or titanium can be used.
Tungsten and copper contain a high melting temperature that necessitates the full dissolution of the tungsten and copper in the solution at 1040-1100degC (compared to 2507 which is 1020-1080degC). At lower temperatures, W and Cu carbides/intermetallics remain unsolvable, so they decrease the corrosion resistance. Higher temperature required to give maximum PREN.
Fillers that are matching AWS A5.9 ER2595 (25Cr-10Ni-4Mo-W-Cu-N) or ER385. Fabricators in some cases would use ER2594 (2507 filler) as a cost-saving with a minor decrease in weld corrosion resistance. GTAW for root, GMAW for fill. Heat 0.5-2.5kJ/mm to obtain 40-60% ferrite. No preheat or PWHT required.
32760 is stronger (550 MPa vs 300 MPa yield), superior SCC resistance, less expensive. 254 SMO (6Mo) is slightly higher PREN ([?]43), superior crevice in very high-temperature seawater >100degC.
Yes, complying with NACE MR0175/ ISO 15156. Hardness [?]35 HRC ([?]327 HB duex) ferrite 40-60% HIC testing NACE TM0284, SSC testing, product analysis. 32760 is very competent in severe sour service when properly qualified.
Yes the copper content (0.5-1.0) has a better sulfuric acid resistance than 2507 (no copper). 32760 can be diluted to moderate concentrations of sulfuric acid. This applies to nickel alloys (Alloy 20, C-276) that are normally needed in case of concentrated H2SO4.
Extremely low global inventory. Made to order only: 12- 16 weeks with special alloy procurement (W and Cu controlled composition), forging, higher temperature (1040-1100degC) solution annealing, rapid water quenching, extensive testing (CPT >70degC compulsory, ferrite, impact, IGC), and documentation. No expedited service since critical processing was required and global production capacity was limited.
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