Hastelloy Alloys
Nickel-molybdenum and nickel-chromium-molybdenum alloys for aggressive acids, chlorides, oxidizing media and FGD scrubber environments.
Corrosion Resistant Alloy Hub
Corrosion Resistant Alloy Products
Quick Answer: J&A Alloy supplies corrosion resistant nickel alloys for acid, chloride, caustic alkali, seawater, FGD scrubber, sour service and severe chemical processing applications. Available grades include Hastelloy, Incoloy, Inconel, Monel and commercially pure nickel in pipe, tube, plate, sheet, bar, wire, flange, fitting and forging forms.
This page helps engineers and buyers compare corrosion resistant alloy families, match grades to service environments and prepare RFQs with the right standards, product forms and inspection requirements.
Quick Selection Guide
| If your service involves... | Start with these alloys | Why |
|---|---|---|
| Sulfuric acid or phosphoric acid | Incoloy 825, Incoloy 20, Hastelloy C-276 | These alloys combine nickel, chromium, molybdenum and sometimes copper for acid corrosion resistance. |
| Severe chloride plus acid corrosion | Hastelloy C-276, Hastelloy C-22 | High molybdenum and chromium content improves resistance to pitting, crevice corrosion and mixed acids. |
| Caustic soda or hot alkali | Nickel 200, Nickel 201 | Commercially pure nickel is widely used for caustic alkali; Nickel 201 is preferred at higher temperatures. |
| Seawater, brine or marine equipment | Monel 400, Inconel 625, Monel K500 | Nickel-copper and nickel-chromium-molybdenum alloys are common starting points for chloride-rich marine service. |
| FGD scrubber or wet chlorine conditions | Hastelloy C-276, Hastelloy C-22, Inconel 625 | These environments often require alloys with strong chloride and oxidizing-media resistance. |
Final alloy selection should consider medium concentration, temperature, pressure, chloride level, impurities, flow condition and applicable engineering standard.
Main Corrosion Resistant Alloy Families
Incoloy & Inconel Alloys
Nickel-iron-chromium and nickel-chromium alloys for acid service, chloride corrosion, oxidation resistance and high-temperature chemical equipment.
Nickel & Monel Alloys
Commercially pure nickel and nickel-copper alloys for caustic alkali, seawater, hydrofluoric acid and marine engineering service.
Popular Corrosion Resistant Alloy Products
| Alloy | UNS | Best For | Common Product Forms |
|---|---|---|---|
| Hastelloy C-276 | UNS N10276 | Severe acid, chloride and FGD scrubber corrosion | Plate, pipe, bar, fittings |
| Hastelloy C-22 | UNS N06022 | Oxidizing acids, wet chlorine and mixed chemical service | Plate, sheet, pipe, bar |
| Incoloy 825 | UNS N08825 | Sulfuric acid, phosphoric acid and chemical equipment | Pipe, plate, sheet, flange |
| Inconel 625 | UNS N06625 | Seawater, chemical processing and heat exchanger service | Pipe, plate, bar, wire, forging |
| Nickel 200 | UNS N02200 | Caustic alkali service below about 315°C | Plate, bar, pipe, sheet |
| Nickel 201 | UNS N02201 | Hot caustic service and low-carbon pure nickel applications | Sheet, pipe, bar, strip |
| Monel 400 | UNS N04400 | Seawater, brine, hydrofluoric acid and marine service | Bar, plate, pipe, fittings |
| Monel K500 | UNS N05500 | High-strength nickel-copper service, shafts, fasteners and springs | Bar, wire, forging |
Choose by Corrosive Environment
| Environment | Recommended Starting Grades | Selection Notes |
|---|---|---|
| Sulfuric acid | Incoloy 825, Alloy 20, Hastelloy C-276 | Consider acid concentration, temperature, aeration and oxidizing impurities. |
| Phosphoric acid | Incoloy 825, Hastelloy C-276, Hastelloy C-22 | Impurities such as chlorides and fluorides can change alloy selection. |
| Chloride / seawater | Inconel 625, Monel 400, Monel K500, Hastelloy C-276 | Review pitting, crevice corrosion, flow rate and mechanical load. |
| Caustic alkali | Nickel 200, Nickel 201 | Nickel 201 is preferred for higher-temperature service due to lower carbon. |
| FGD scrubber | Hastelloy C-276, Hastelloy C-22, Inconel 625 | Pay attention to chloride level, pH, temperature and deposit conditions. |
| Hydrofluoric acid | Monel 400, Nickel 200/201 | Final selection depends strongly on acid concentration, aeration and contaminants. |
Corrosion Resistant Alloy vs Stainless Steel
Stainless steels are suitable for many general industrial environments, but severe acids, hot alkali, seawater chlorides, FGD scrubbers and mixed chemical media can exceed the corrosion resistance of standard stainless grades. Corrosion resistant nickel alloys are selected when the project needs stronger resistance to pitting, crevice corrosion, stress corrosion cracking, reducing acids or high-temperature chemical attack.
| When stainless steel may be enough | When corrosion resistant alloy is recommended |
|---|---|
| Mild atmospheric or low-chloride service | High chloride seawater, brine, sour or acidic service |
| Moderate temperature and neutral pH | High temperature, low pH, oxidizing or reducing acid media |
| Standard process water and general equipment | Heat exchangers, scrubbers, reactors, acid tanks and critical process piping |
Available Product Forms
| Product Form | Typical Alloys | RFQ Information to Confirm |
|---|---|---|
| Plate / Sheet / Strip | Hastelloy C-276, C-22, Incoloy 825, Nickel 200/201 | Thickness, width, length, surface, cutting and tolerance. |
| Pipe / Tube | Incoloy 825, Inconel 625, Nickel 200/201, Monel 400 | Seamless or welded type, OD, wall thickness, schedule and standard. |
| Bar / Rod | Monel K500, Hastelloy C-276, Inconel 625, Nickel 200 | Diameter, length, heat treatment condition, tolerance and inspection. |
| Flange / Fittings | Incoloy 825, Hastelloy C-276, Inconel 625, Monel 400 | Pressure class, drawing, standard, sealing face and test requirement. |
| Wire / Forging | Monel K500, Inconel 625, Nickel 201, Hastelloy alloys | Diameter, coil/spool, forging drawing, condition and mechanical properties. |
Common Standards and Specifications
| Alloy Family | Common ASTM Standards | Typical Forms |
|---|---|---|
| Hastelloy C-276 / C-22 / C-4 | ASTM B575, B622, B626, B574, B564 | Plate, sheet, pipe, tube, bar, forging, flange |
| Incoloy 825 / Alloy 20 / Incoloy 28 | ASTM B424, B425, B423, B704, B705, B462 | Plate, sheet, pipe, tube, bar, fittings, flange |
| Inconel 625 / 600 / 601 / 690 / 725 | ASTM B443, B444, B446, B564, B167, B168 | Plate, pipe, tube, bar, wire, forging |
| Nickel 200 / Nickel 201 | ASTM B162, B163, B160, B725, B730 | Sheet, plate, pipe, tube, bar, strip |
| Monel 400 / Monel K500 | ASTM B127, B164, B165, B865, B564 | Plate, bar, pipe, tube, wire, forging |
Related Material Selection Links
Use these links to compare product families and individual grades before sending a corrosion resistant alloy RFQ.
Corrosion Resistant Alloy FAQ
What is a corrosion resistant alloy?
A corrosion resistant alloy is a metal alloy designed to resist chemical attack, acid corrosion, chloride pitting, caustic alkali or seawater corrosion better than standard carbon steel or stainless steel.
Which alloy is best for sulfuric acid?
Incoloy 825 and Alloy 20 are common starting points for sulfuric acid, while Hastelloy C-276 may be considered for more severe mixed acid or chloride conditions.
What alloy is used for caustic soda?
Nickel 200 and Nickel 201 are widely used for caustic alkali service. Nickel 201 is typically preferred for higher-temperature applications because of its lower carbon content.
Hastelloy C-276 vs C-22: which should I choose?
C-276 is widely used for severe reducing and chloride environments, while C-22 offers strong resistance in many oxidizing chloride media. Final choice depends on medium, temperature and contaminants.
What information is needed for an RFQ?
Please send alloy grade, UNS number, product form, size, quantity, standard, material condition, inspection requirement and destination country. Service conditions help us recommend a practical grade.
Can J&A Alloy supply custom sizes?
Yes. J&A Alloy can quote standard and custom sizes for plate, sheet, pipe, tube, bar, wire, flange, fitting and forging requirements depending on alloy and quantity.
Request a Corrosion Resistant Alloy Quote
Send us the alloy grade, UNS number, product form, size, quantity, standard, material condition, service medium and destination country. If you are not sure which alloy is suitable, include the medium, concentration, temperature, pressure, chloride level and applicable standard for review.
- Material: alloy grade, UNS number or equivalent specification
- Form and size: plate, sheet, pipe, tube, bar, wire, flange, fitting or forging
- Inspection: EN 10204 3.1 MTC, PMI, UT, third-party inspection
- Service conditions: medium, concentration, temperature, pressure and corrosion concerns