 NICKEL-MOLYBDENUM ALLOY FLANGES MANUFACTURER & SUPPLIER.webp)
Hastelloy B2 (Alloy B2) Nickel-Molybdenum Alloy Flanges Manufacturer & Supplier
Metinox Overseas is one of the biggest manufacturers and distributors of Hastelloy B2(Alloy B2) Nickel-Molybdenum Alloy Flanges that have been designed to perform exceptionally in highly reducing chemical environments and have high resistance against pitting and stress corrosion cracking. Our ASTM B564 UNS N10665 Forged Flanges are composed of a high quality nickel-based superalloy that has a nickel (minimum 65%), molybdenum (26-30%), very low chromium (maximum 1.0%), and extremely low carbon (0.02% maximum), and offers unmatched resistance to reducing acids, as well as, excellent performance at as-welded condition which does not move to post-weld heat treatment.
They are best suited to severe reducing chemistry service between ambient temperature and 540 o C in oxidizing service and to 815 o C and reducing/vacuum service, and are best suited to chemical processing (hydrochloric acid reactors, evaporators), to acetic acid/anhydride production, phosphoric acid plants, sulfuric acid service, petrochemical operations, pharmaceutical manufacturing, and where elimination of grain boundary carbide precipitation is required. Its carbon and silicon content is so low to avoid sensitization during welding although the operators should not expose their oxidizing environment to ferric/cupric salts and high temperatures of 540-815 C resulting to the formation of brittle phases.
Table of Contents
- Hastelloy B2 Flanges Technical Specifications
- Hastelloy B2 Equivalent Grades
- Hastelloy B2 Chemical Composition
- Mechanical Properties of Hastelloy B2 Flanges
- Hastelloy B2 Flange Dimensions & Pressure Rating Chart
- Types of Hastelloy B2 Flanges Available
- Standard Flange Sizes & Weight Chart
- Is Hastelloy B2 Good Quality for Hydrochloric Acid and Reducing Chemical Service?
- Heat Treatment & Testing Requirements
- Hastelloy B2 Nickel-Molybdenum Alloy Flanges Price List 2026
- Applications of Hastelloy B2 Flanges in Industry
- Why Choose Hastelloy B2 Flanges from Metinox Overseas?
- Hastelloy B2 Flange Delivery Time & CIF Pricing by Country
- Other Types of Hastelloy B2 Flanges
- People Also Search For
- Frequently Asked Questions (FAQ)
Hastelloy B2 Flanges Technical Specifications
| Category | Details |
| Global Standards | ASME/ANSI B16.5 & B16.47 (Ser. A & B), B16.48, EN-1092, DIN, BS 10, BS 4504, GOST, JIS B2220 |
| Size Range | 1/2" (15 NB) to 48" (1200 NB) |
| Pressure Ratings | ASME: 150# to 2500# JIS: 5K to 63K EN/DIN: 6 Bar to 40 Bar |
| Flange Face Types | Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ), Lap-Joint (LJF), Male-Female (M&F), Tongue & Groove (T&G) |
| Production Method | Precision Forging, Heat Treatment, and CNC Machining |
| Configuration | Equal and Reducing configurations; Custom designs as per technical drawings |
| Quality Control | 100% Radiography (RT), Third-Party Inspection (TPI), Raw Material Verification |
| Compliance | EN 10204/3.1B MTC, NACE MR0175 (where applicable) |
| Primary Markets | Petroleum, Shipbuilding, Chemical Processing, Power Generation, and Metallurgy |
Hastelloy B2 Equivalent Grades
These flanges are made in different standards that are used internationally. So the most common standards of this material are given below.
| Standard Name | Werkstoff Nr. | UNS |
| Inconel X-750 | 2.4669 | N07750 |
Hastelloy B2 Chemical Composition
The detailed chemical composition of Hastelloy B2 Flanges are given below.
| Grade | Ni (min) | Cr | Ti | Al | Fe | Mn (max) | Si (max) | Cu (max) | C (max) | S (max) |
| X-750 | 70.0% | 14.0-17.0% | 2.25-2.75% | 0.40-1.0% | 5.0-9.0% | 1.00% | 0.50% | 0.50% | 0.08% | 0.01% |
Mechanical Properties of Hastelloy B2 Flanges
The Hastelloy B2 Flanges come with many mechanical properties that are listed below.
| Grade | Density | Melting Point | Tensile Strength | Yield Strength (0.2% Offset) | Elongation |
| Inconel X-750 | 8.28 g/cm- | 1430-C (2600-F) | 1267 MPa | 868 MPa | 25% |
Hastelloy B2 Flange Dimensions & Pressure Rating Chart
Pressure-Temperature Ratings for Hastelloy B2 Flanges (ASTM B564 N10665)
| Temperature -F (-C) | Class 150 | Class 300 | Class 600 | Class 900 | Class 1500 | Class 2500 |
| -20 to 100 (-29 to 38) | 285 psi | 740 psi | 1480 psi | 2220 psi | 3705 psi | 6170 psi |
| 200 (93) | 260 psi | 675 psi | 1350 psi | 2025 psi | 3375 psi | 5625 psi |
| 400 (204) | 218 psi | 565 psi | 1130 psi | 1695 psi | 2825 psi | 4710 psi |
| 600 (316) | 170 psi | 440 psi | 880 psi | 1320 psi | 2200 psi | 3665 psi |
| 800 (427) | 128 psi | 330 psi | 660 psi | 990 psi | 1650 psi | 2750 psi |
| 1000 (538) | 85 psi | 220 psi | 440 psi | 660 psi | 1100 psi | 1835 psi |
Types of Hastelloy B2 Flanges
| Flange Type | Description |
| Weld Neck (WN) | Butt-welded connection with long tapered hub for high-pressure hydrochloric acid service |
| Slip-On (SO) | Slides over pipe for fillet welding, suitable for reducing acid environments |
| Blind (BL) | Solid disc for closing pipe ends in sulfuric acid reactors and acetic acid vessels |
| Socket Weld (SW) | Internal socket design for small bore piping in pharmaceutical acid processing |
| Lap Joint (LJ) | Loose flange with stub end for systems requiring frequent dismantling and inspection |
| Threaded (TH) | NPT/BSP threaded connection for non-welded reducing acid applications |
| Orifice | Flow measurement flanges for hydrochloric acid production and chemical processing |
| Long Weld Neck | Extended neck design for thermal stress applications in acid handling systems |
| Reducing | Different bore sizes for transitioning pipe diameters in non-oxidizing acid service |
Standard Flange Sizes & Weight Chart
Hastelloy B2 Weld Neck Flange Dimensions (ANSI B16.5) - Class 600 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" | 95 | 16 | 21 | 41 | 66 | 4 | M16 | 0.95 |
| 1" | 124 | 21 | 33 | 57 | 89 | 4 | M19 | 1.95 |
| 2" | 165 | 25 | 60 | 84 | 127 | 8 | M19 | 4.28 |
| 4" | 273 | 32 | 114 | 146 | 216 | 8 | M25 | 13.9 |
| 6" | 356 | 38 | 168 | 210 | 270 | 12 | M25 | 29.7 |
| 8" | 419 | 41 | 219 | 270 | 330 | 12 | M28 | 47.1 |
| 10" | 508 | 48 | 273 | 330 | 403 | 16 | M32 | 81.0 |
| 12" | 559 | 52 | 324 | 381 | 476 | 20 | M32 | 109.9 |
| 16" | 711 | 64 | 419 | 495 | 603 | 20 | M38 | 207.6 |
| 20" | 838 | 70 | 508 | 603 | 724 | 24 | M38 | 320.3 |
| 24" | 991 | 78 | 610 | 705 | 838 | 24 | M45 | 475.9 |
Is Hastelloy B2 Good Quality for Hydrochloric Acid and Reducing Chemical Service?
Yes, Hastelloy B2 (Alloy B2, UNS N10665) is commonly considered the best nickel based alloy to use in service in hydrochloric acid at all concentrations and temperatures with excellent resistance to reducing chemical environments such as hydrogen chloride gas, sulfuric acid, acetic acid, phosphoric acid and other non oxidizing acid service with excellent resistance to pitting and stress corrosion cracking. Hastelloy B2, introduced in 1960s by Haynes International through a modernized argon-oxygen decarburization technology, specifically was developed to address the weld sensitization issues of the original Hastelloy B as well as to have maximum resistance to hydrochloric acid compared to all other commercially available nickel alloys.
The molybdenum base (26-30), nickel base (minimum 65) and extremely low chromium content provide Hastelloy B2 with unparalleled resistance to hydrochloric acid in both the entire range of dilute to concentrated solution including the azeotropic 20% solution and between ambient and boiling temperature. The very small carbon content (max. 0.02%) and low silicon (max. 0.10%) means that it resists precipitation of carbide grain boundaries in the weld heat-affected areas, meaning that it can be used in the as-welded state without any post-weld heat treatment.
Corrosion tests reveal that the rates are usually below 0.05 mm/year in most hydrochloric acid conditions where stainless steels would be disastrous. It is highly resistant to hydrogen chloride gas, and this property has ensured that the alloy can be used both in the liquid and vapour phase of hydrogen chloride systems, chlorination processes and other applications requiring this property. Hastelloy B2 is a material with the best resistance to sulfuric acid at some concentration and temperatures, acids and acid anhydride production, phosphoric acid production and a range of organic acid services.
Limitations that are essential should be known to be used well. The alloy is not to be subjected to oxidizing media, especially at the presence of ferric or cupric salts. Whenever iron or copper-containing equipment is contacted by hydrochloric acid upstream, the metal ions present in the acid pollute it and rapidly corrode Hastelloy B2 components. The alloy should never be subjected to any environment below 540-815o C (1000-1500o F) because they lead to the precipitation of brittle Ni4Mo intermetallic phases and Ni3Mo intermetallic phases and these tremendously impair ductility and corrosion resistance.
Hastelloy B2 can be safely used up to 540 o C in oxidizing atmospheres like air. The alloy may be reduced in temperature, inert gases, or vacuum between 815C and significantly higher temperatures, so it has found application in situations that require vacuum furnace work or high-temperature reducing atmosphere work. The good elevated temperature strength in the solid solution strengthened microstructure has no precipitation hardening.
Hastelloy B2 is widely employed in hydrochloric acid service, chemical reactors, distillation columns, heat exchangers, evaporators, piping systems, valves, and pumps, acetic acid/anhydride production, sulfuric acid processing, petrochemical ethylene glycol production, pharmaceutical manufacturing and in herbicide and insecticide production and vacuum furnace equipment.
Heat Treatment & Testing Requirements
Heat Treatment Requirements (Mandatory)
| Process | Step / Parameter | Requirement | Remarks |
| Solution Annealing + Rapid Quenching | Solution Annealing Temperature | 1065-1080-C (1950-F) | Optimal for complete carbide dissolution |
| Holding Time | Adequate soaking | Based on section thickness | |
| Cooling After Annealing | Rapid water quench | Essential for single-phase austenitic structure | |
| Critical Cooling Rate | Fast cooling through critical range | Slow cooling causes carbide precipitation | Critical Requirement |
| Ferrite-free structure | Must be fully austenitic | Verify with ferrite detector |
Testing & Inspection Requirements (Comprehensive)
| Test / Inspection | Standard / Requirement | Acceptance / Remarks |
| Tensile Testing | ASTM E8 | Yield = 51 ksi (350 MPa), Tensile = 110 ksi (760 MPa), Elongation = 40% |
| Hardness Testing | ASTM E10 / E18 | Typical 200-250 HB (84-95 HRB) |
| Charpy Impact Testing | ASTM E23 | Excellent toughness |
| PMI Testing | Positive Material Identification | Ni (=65%), Mo (26-30%), Cr (=1.0%) |
| Ferrite Detection | Ferritescope / Magnetic test | Must be ferrite-free (0% ferrite) |
| Ultrasonic Testing | ASTM A388 | Mandatory for critical applications |
Hastelloy B2 Nickel-Molybdenum Alloy Flanges Price List 2026
| Flange Type | Size Range | Pressure Class | Indicative Price Range (USD/Piece) |
| Weld Neck (WN) | 1/2" - 2" | 150# | $135 - $335 |
| Weld Neck (WN) | 4" - 8" | 150# | $565 - $2,125 |
| Weld Neck (WN) | 10" - 24" | 150# | $3,350 - $12,050 |
| Weld Neck (WN) | 1/2" - 2" | 300# | $195 - $485 |
| Weld Neck (WN) | 4" - 8" | 300# | $845 - $3,055 |
| Weld Neck (WN) | 10" - 24" | 300# | $4,825 - $17,350 |
| Weld Neck (WN) | 1/2" - 2" | 600# | $295 - $715 |
| Weld Neck (WN) | 4" - 8" | 600# | $1,325 - $4,565 |
| Slip-On (SO) | 1/2" - 2" | 150# | $112 - $275 |
| Slip-On (SO) | 4" - 8" | 150# | $465 - $1,705 |
| Blind (BL) | 1/2" - 2" | 150# | $98 - $245 |
| Blind (BL) | 4" - 8" | 150# | $485 - $1,915 |
| Socket Weld (SW) | 1/2" - 2" | 150# - 600# | $148 - $615 |
Applications of Hastelloy B2 Flanges in Industry
The use of Hastelloy B2 flanges is mostly common in industries where such qualities like high strength, resistance to oxidation, and stability at high temperatures are needed.
- Chemical Processing: Hydrochloric acid reactors, heat exchangers, evaporators at all concentrations
- Acetic Acid Production: Acetic acid and acetic anhydride manufacturing equipment
- Phosphoric Acid Plants: Production and handling equipment, reactors
- Sulfuric Acid Service: Specific concentration and temperature conditions
- Petrochemical: Ethylene glycol production, ethyl benzene manufacturing
- Pharmaceutical Manufacturing: Equipment handling reducing chemicals
- Agrochemical: Herbicide and insecticide production facilities
- Vacuum Furnace: High-temperature components operating in reducing media
Why Choose Hastelloy B2 Flanges from Metinox Overseas?
Metinox Overseas offers certified Hastelloy B2 (Alloy B2) nickel-molybdenum alloy flanges with high solution annealing at 1065-1080 o C, fast quenching in water, and full testing with ferrite detection giving a fully austenitic structure in the service of hydrochloric acid and reducing chemicals. We have ISO 9001:2015 and PED certified manufacturing plants where all the flanges are subject to controlled heat treatment with full documentation. About all flanges are furnished with EN 10204 3.1B Mill Test Certificates with full chemical analysis (Ni 65 minimum, Mo 26-30 minimum, Cr less than 1.0 minimum, C less than 0.03 minimum), full tensile properties (tensile at least 110 ksi, yield at least 51 ksi, elongation at least 40%), hardness verification (200-250 HB), ferrite presence verification (0% ferrite maximum), and We offer technical advice on the choice of Hastelloy B2 material to use in service of hydrochloric acid, acetic acid plants, phosphoric acid plants, welding procedures (AWS A5.14 ERNiMo-1 filler metal), and ASME B31.3 to chemical processing plants, pharmaceutical manufacturers, petrochemical operations, and agrochemical plants across the globe.
Hastelloy B2 Flange Delivery Time & CIF Pricing by Country
| Destination Region | Major Ports / Cities | Estimated Delivery Time | Typical CIF Terms |
| Middle East (GCC) | Dubai, Dammam, Doha | 14-18 Days | CIF Dubai / CIF Dammam |
| Europe | Rotterdam, Hamburg | 28-35 Days | CIF Rotterdam / CIF Hamburg |
| USA & Canada | Houston, New York | 35-45 Days | CIF Houston / CIF New York |
| Southeast Asia | Singapore, Port Klang | 18-25 Days | CIF Singapore / CIF Port Klang |
| Africa | Lagos, Durban | 25-35 Days | CIF Lagos / CIF Durban |
Other Types of Hastelloy B2 Flanges
ASTM B564 N10665 Flanges, UNS N10665 Weld Neck Flanges, Hastelloy B2 Blind Flanges, Alloy B2 Hydrochloric Acid Flanges, Hastelloy B2 Reducing Chemical Flanges, Alloy B2 As-Welded Flanges.
People Also Search For
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Frequently Asked Questions (FAQ)
We are ISO 9001:2015 and PED certified. EN 10204 3.1 Mill Test Certificates are offered to the Hastelloy B2 flanges as a chemical processing application.
Quickly water quenched solution annealing at 1065-1080degC. We carry out PMI, tensile, hardness, and austenitic structure in the form of ferrite.
Hydrochloric acid service, acetic acid, production, phosphoric acid plants, petrochemical, pharmaceutical, agrochemical, facilities.
Filler metal AWS A5.14 ERNiMo -1, no preheat necessary. AVOID oxidizing media that contain ferric/cupric salts and ferric/cupric salts at temperatures between 540-815degC which result in embrittlement.
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