 NICKEL-MOLYBDENUM ALLOY FLANGES MANUFACTURER & SUPPLIER.webp)
Hastelloy B3 (Alloy B3) Nickel-Molybdenum Alloy Flanges Manufacturer & Supplier
Metinox Overseas is one of the largest manufacturers and distributors of Hastelloy B3 (Alloy B3) Nickel-Molybdenum Alloy Flanges that have excellent resistance to hydrochloric acids with superior thermal stability than Hastelloy B2 and offers outstanding performance in reducing chemical environments with enhanced fabricability and improved resistance to grain boundary carbide precipitation over a broader temperature range. Our ASTM B564 UNS N10675 Forged Flanges contain high quality nickel-based superalloy composition form of nickel (minimum 65%), molybdenum (28.5-31.5%), chromium (1.5% maximum), tungsten (1.5-3.5%), and very low amount of carbon (0.01% maximum), which provides excellent hydrochloric acid service and thermal stability at temperatures 540C-760 C at which embrittlements by B2
They are ideally suited to harsh reducing chemical service at cryogenic temperature to 650 -C continuous service, perform well in chemical processing (hydrochloric acid reactor service at all concentrations and temperatures), acetic acid/anhydride manufacturing, phosphoric acid plant service which demands thermal cycling, sulfuric acid service, petrochemical service at varying temperatures and pharmaceutical manufacture and have no 540-815 -C embrittlement zone issue since they can be optimally refined in composition.
Table of Contents
- Hastelloy B3 Flanges Technical Specifications
- Hastelloy B3 Equivalent Grades
- Hastelloy B3 Chemical Composition
- Mechanical Properties of Hastelloy B3 Flanges
- Hastelloy B3 Flange Dimensions & Pressure Rating Chart
- Types of Hastelloy B3 Flanges Available
- Standard Flange Sizes & Weight Chart
- Is Hastelloy B3 Good Quality for Hydrochloric Acid with Superior Thermal Stability?
- Heat Treatment & Testing Requirements
- Hastelloy B3 Nickel-Molybdenum Alloy Flanges Price List 2026
- Applications of Hastelloy B3 Flanges in Industry
- Why Choose Hastelloy B3 Flanges from Metinox Overseas?
- Hastelloy B3 Flange Delivery Time & CIF Pricing by Country
- Other Types of Hastelloy B3 Flanges
- People Also Search For
- Frequently Asked Questions (FAQ)
Hastelloy B3 Flanges Technical Specifications
| Feature | Details |
| Specifications | ASTM B564 / ASME SB564 / DIN 17744 |
| Grade | UNS N10675 (Hastelloy B3, Alloy B3) |
| Material Designation | Nickel-Molybdenum-Tungsten Alloy (Ni-Mo-W) |
| UNS Number | N10675 |
| Werkstoff Number | 2.4600 |
| 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#, 400#, 600#, 900#, 1500#, 2500# (B16.5); 75#, 150#, 300#, 400#, 600#, 900# (B16.47) |
| Flange Types | Weld Neck, Slip-On, Blind, Socket Weld, Lap Joint, Threaded, Orifice, Long Weld Neck, Reducing |
| Flange Face | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Male & Female, Tongue & Groove |
| Manufacturing Type | Hot Forged |
| Microstructure | Austenitic (FCC) Solid Solution (Solution Annealed) |
| Heat Treatment | Solution Annealed at 1120-1160-C + Rapid Water Quench (Mandatory) |
| Testing | Tensile, Hardness, Impact, PMI, Ferrite Detection, Ultrasonic |
| Inspection | Third Party Inspection by TUV, SGS, Bureau Veritas, Lloyd's, DNV GL, BV, ABS |
| Certifications | EN 10204 3.1B MTC, PED 2014/68/EU, CE Marked, ASME B31.3 |
Hastelloy B3 Equivalent Grades
| STANDARD | USA | GERMANY | EUROPE | JAPAN | UK | CHINA |
| Hastelloy B3 | UNS N10675 | 2.4600 | 2.4600 | - | NA 23 | - |
| ASTM B564 N10675 | NiMo31CrW | NiMo31CrW | ||||
| Alloy B3 | W.Nr. 2.4600 | |||||
| Hastelloy B-3 |
Hastelloy B3 Chemical Composition
| Element | Composition (%) | Function |
| Nickel (Ni) | 65.0 minimum (balance) | Base element, provides corrosion resistance in reducing media |
| Molybdenum (Mo) | 28.5 - 31.5 | Outstanding resistance to hydrochloric acid and reducing acids |
| Tungsten (W) | 1.5 - 3.5 | Enhances thermal stability, prevents embrittlement in 540-760-C range |
| Chromium (Cr) | 1.5 max | Minimized to maintain reducing acid resistance |
| Iron (Fe) | 1.5 max | Controlled lower than B2 for improved corrosion resistance |
| Manganese (Mn) | 3.0 max | Controlled for fabricability |
| Silicon (Si) | 0.10 max | Minimized to prevent carbide precipitation |
| Carbon (C) | 0.01 max | Extremely low to prevent grain boundary carbide precipitation |
| Cobalt (Co) | 3.0 max | Controlled as residual element |
| Phosphorus (P) | 0.040 max | Minimized for corrosion resistance |
| Sulfur (S) | 0.030 max | Minimized for corrosion resistance and hot workability |
| Aluminum (Al) | 0.50 max | Controlled as residual element |
| Titanium (Ti) | 0.20 max | Controlled as residual element |
Mechanical Properties of Hastelloy B3 Flanges
| Property | Requirement (Solution Annealed) | Testing Standard |
| Tensile Strength | 690 MPa (100 ksi) minimum | ASTM E8 |
| Yield Strength (0.2% offset) | 310 MPa (45 ksi) minimum | ASTM E8 |
| Elongation in 2" | 40% minimum | ASTM E8 |
| Hardness (Brinell) | 175-230 HB (typical) | ASTM E10 |
| Hardness (Rockwell B) | 82-92 HRB (typical) | ASTM E18 |
| Charpy V-Notch Impact | Excellent toughness | ASTM E23 |
| Density | 9.20 g/cm- (0.332 lb/in-) | - |
Hastelloy B3 Flange Dimensions & Pressure Rating Chart
Pressure-Temperature Ratings for Hastelloy B3 Flanges (ASTM B564 N10675)
| 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 |
| 1200 (649) | 60 psi | 155 psi | 310 psi | 465 psi | 775 psi | 1290 psi |
Types of Hastelloy B3 Flanges Available
| Flange Type | Description |
| Weld Neck (WN) | Butt-welded hub design with superior thermal stability for hydrochloric acid at all concentrations |
| Slip-On (SO) | Slip-over design for fillet welding in sulfuric acid and acetic acid environments |
| Blind (BL) | Solid closure flange for pressure vessel ends in reducing acid chemical plants |
| Socket Weld (SW) | Socket connection for small diameter piping in pharmaceutical and fine chemical manufacturing |
| Lap Joint (LJ) | Loose ring flange for applications requiring regular maintenance in acid service |
| Threaded (TH) | Threaded design for non-welded connections in non-oxidizing corrosive atmospheres |
| Orifice | Flow control and measurement flanges for hydrochloric and sulfuric acid production |
| Long Weld Neck | Extended neck for thermal expansion compensation in high-temperature acid processing |
| Reducing | Transitional bore design for connecting different pipe sizes in reducing acid applications |
Standard Flange Sizes & Weight Chart
Hastelloy B3 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 | 0.94 |
| 1" | 124 | 21 | 33 | 57 | 89 | 4 | M19 | 1.94 |
| 2" | 165 | 25 | 60 | 84 | 127 | 8 | M19 | 4.26 |
| 4" | 273 | 32 | 114 | 146 | 216 | 8 | M25 | 13.8 |
| 6" | 356 | 38 | 168 | 210 | 270 | 12 | M25 | 29.6 |
| 8" | 419 | 41 | 219 | 270 | 330 | 12 | M28 | 46.9 |
| 10" | 508 | 48 | 273 | 330 | 403 | 16 | M32 | 80.7 |
| 12" | 559 | 52 | 324 | 381 | 476 | 20 | M32 | 109.5 |
| 16" | 711 | 64 | 419 | 495 | 603 | 20 | M38 | 206.8 |
| 20" | 838 | 70 | 508 | 603 | 724 | 24 | M38 | 319.2 |
| 24" | 991 | 78 | 610 | 705 | 838 | 24 | M45 | 474.2 |
Is Hastelloy B3 Good Quality for Hydrochloric Acid with Superior Thermal Stability?
Yes, Hastelloy B3 (Alloy B3, UNS N10675) is considered as the most thermally stable nickel-molybdenum alloy to the service of hydrochloric acid, with the same or better corrosion capability as Hastelloy B2 at all concentrations and temperatures and is free of the critical 540-815degC decrease affects embrittlement tungsten-free with the help of strategic addition of tungsten and controlled composition. Hastelloy B3 is an improved replacement of B2 invented by Haynes International in the 1990s to overcome the thermal stability issues of B2 without losing the outstanding hydrochloric acid resistance capabilities that made B2 the industry standard in eliminating chemical environments.
This combination of molybdenum content (28.5-31.5) and a planned addition of tungsten (1.5-3.5) makes Hastelloy B3 to have unparalleled capability of being resistant to hydrochloric acid, as well as, thermal stability. This is because tungsten addition in particular inhibits the occurrence of the brittle Ni-Mo intermetallic phases (Ni4Mo and Ni3Mo) that ravage B2 over the 540-815degC temperature range, thus rendering B3 to be suitable where temperature cycling, process upsets or thermal excursions occur. Very low carbon (0.01% maximum even lower than B2 0.02) and silicon (0.10% maximum) give high resistance to grain boundary carbide precipitation during welding and thermal cycling.
Numerous tests show that Hastelloy B3 will be as resistant to corrosion in hydrochloric acid as B2 in all dilute concentrations of hydrochloric acid, including both dilute and concentrated solutions, as well as in all ambient and boiling temperatures. In the majority of hydrochloric acid cases the corrosion rates are usually less than 0.05mm/year. The alloy exhibits a high level of resistance to hydrogen chloride gas and sulfuric acid at certain concentrations, acetic acid and acetic anhydride and phosphoric acid and other organic acids in reducing conditions.
The major benefit of Hastelloy B3 compared to B2 is its thermal stability. B3 is safe at any range of temperature without the 540-815degC forbidden zone to restrict the use of B2. This renders B3 to be applicable in processes with change of temperatures, start up/shut down, or possible thermal runaway. The increased thermal stability also contributes to better fabricability with B3 components being able to be subjected to forming, welding, and heat treatments operations without a significant chance of embrittlement as a result of an unintended exposure to intermediate temperatures.
Similar to B2, Hastelloy B3 is not to be used in oxidizing media, especially the salts of ferric or cupric. When metal ion contamination ensues, metal ion on iron or copper bearing equipment, the resultant accelerated corrosion may occur when hydrochloric acid is in contact with the machines. In HCl service, the equipment must not be used downstream of an iron or copper equipment. Nevertheless, B3 has a higher thermal stability and is therefore more tolerant to fabrication and installation.
Hastelloy B3 is widely applied in chemical reactors working with the hydrochloric acid of all concentrations, heat exchangers in the production of acetic acid/anhydride, in the evaporators and distillation columns in the phosphoric acid plants, piping systems that demand temperature changing requirements, with the valves and pumps in reducing chemical service, in the pharmaceutical manufacturing equipment, petrochemical operations, where ethylene glycol is produced and in the herbicide and insecticide production, and in any application involving the use of hydrochloric
Heat Treatment & Testing Requirements
Heat Treatment Requirements (Mandatory)
| Process | Step / Parameter | Requirement | Remarks |
| Solution Annealing + Rapid Quenching | Solution Annealing Temperature | 1120-1160-C (2050-2120-F) | Higher than B2 due to tungsten addition |
| Holding Time | Adequate soaking | Based on section thickness, typically 30+ min | |
| Cooling After Annealing | Rapid water quench | Essential for single-phase austenitic structure | |
| Critical Cooling Rate | Fast cooling through critical range | Maintains thermal stability advantage | 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 = 45 ksi (310 MPa), Tensile = 100 ksi (690 MPa), Elongation = 40% |
| Hardness Testing | ASTM E10 / E18 | Typical 175-230 HB (82-92 HRB) |
| Charpy Impact Testing | ASTM E23 | Excellent toughness across temperature range |
| PMI Testing | Positive Material Identification | Ni (=65%), Mo (28.5-31.5%), W (1.5-3.5%), Cr (=1.5%) |
| Ferrite Detection | Ferritescope / Magnetic test | Must be ferrite-free (0% ferrite) |
| Ultrasonic Testing | ASTM A388 | Mandatory for critical applications |
Hastelloy B3 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# | $145 - $355 |
| Weld Neck (WN) | 4" - 8" | 150# | $595 - $2,245 |
| Weld Neck (WN) | 10" - 24" | 150# | $3,550 - $12,750 |
| Weld Neck (WN) | 1/2" - 2" | 300# | $215 - $515 |
| Weld Neck (WN) | 4" - 8" | 300# | $895 - $3,235 |
| Weld Neck (WN) | 10" - 24" | 300# | $5,115 - $18,350 |
| Weld Neck (WN) | 1/2" - 2" | 600# | $315 - $755 |
| Weld Neck (WN) | 4" - 8" | 600# | $1,405 - $4,835 |
| Slip-On (SO) | 1/2" - 2" | 150# | $122 - $295 |
| Slip-On (SO) | 4" - 8" | 150# | $495 - $1,805 |
| Blind (BL) | 1/2" - 2" | 150# | $108 - $265 |
| Blind (BL) | 4" - 8" | 150# | $515 - $2,025 |
| Socket Weld (SW) | 1/2" - 2" | 150# - 600# | $158 - $655 |
Applications of Hastelloy B3 Flanges in Industry
The use of Hastelloy B3 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 with temperature cycling
- Acetic Acid Production: Equipment handling acetic acid and acetic anhydride with thermal variations
- Phosphoric Acid Plants: Production and handling equipment requiring thermal stability
- Sulfuric Acid Service: Specific concentration and temperature conditions with cycling
- Petrochemical: Ethylene glycol production, processes with temperature excursions
- Pharmaceutical Manufacturing: Equipment handling reducing chemicals with startup/shutdown cycles
- Agrochemical: Herbicide and insecticide production facilities
- Process Equipment: Applications where B2's 540-815-C embrittlement zone poses operational risk
Why Choose Hastelloy B3 Flanges from Metinox Overseas?
Metinox Overseas offers certified alloys Hastelloy B3 (Alloy B3) of nickel-molybdenum-tungsten alloys flanges with perfect solution annealed at 11201160 C, fast water quenched and thoroughly tested flanges including ferrite detectable assuring complete austenitic structure to handle hydrochloric acid service with excellent thermal stability to overcome the concern of B2. Our ISO 9001:2015 and PED certified manufacturing plants, where all the flanges are subjected to controlled heat treatment and all the documentation are available. All flanges are provided with EN 10204 3.1B Mill Test Certificates with full chemical analysis ( Ni 0.65% and Mo 28.5-31.5% and W 1.5-3.5% and C 0.01% ), full tensile (tensile 100 ksi and yield 45 ksi and elongation 40% ), hardness verification, ferrite detection (0% ferrite ), and PMI verification. Experts in our technical team offer the best advice on the question of B3 vs B2 material selection, thermal stability benefits, welding processes (AWS A5.14 ERNiMo-7 filler metal), and the compliance of ASME B31.3, which applies to chemical processing plants, pharmaceutical companies, petrochemical plants, and facilities that need a high level of thermal stability.
Hastelloy B3 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 B3 Flanges
ASTM B564 N10675 Flanges, UNS N10675 Weld Neck Flanges, Hastelloy B3 Blind Flanges, Alloy B3 Hydrochloric Acid Flanges, Hastelloy B3 Thermal Stability Flanges, Alloy B3 Temperature Cycling Flanges.
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Frequently Asked Questions (FAQ)
We are ISO 9001:2015 and PED certified. Hastelloy B3 flanges are supplied with EN 10204 3.1 Mill Test Certificates when used in chemical processing application that will need thermal stability.
Rapid water quench solution annealing at 1120-1160-C. We carry out PMI tests, tensile tests, hardness tests, and ferrite tests to ascertain a hundred percent austenitic structure.
B3 was also tungsten (1.5-3.5%) removes the thermal stability (540-815C) of B2 zone, and has the same HCL resistance.
Filler metal AWS A5.14 ERNiMo-7, no preheat. B3 is preferred where there is a cycle of temperature or excursion. Oxidizing media with ferric/cupric salts should be avoided.
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