Hastelloy
Aurico Alloys LLP supplies Hastelloy® from Mumbai in a full range of forms — sheet, plate, coil, strip, foil, bar, wire and tube. Held in stock or arranged with the manufacturer, depending on grade and quantity.
Hastelloy is a family of nickel-molybdenum and nickel-chromium-molybdenum alloys built for wet corrosion — the cases where stainless steel pits, cracks or dissolves. Choosing between them comes down to one question about the process stream: is it reducing or oxidising?
The B grades are nickel-molybdenum and excel in reducing acids, hydrochloric above all, but they have little chromium and so fare badly if the stream turns oxidising. The C grades add chromium to the molybdenum and handle both, which is why they are the usual answer when a plant sees mixed or variable conditions. The remaining grades are specialists: G30 for phosphoric acid, N for molten fluoride salts, and X for strength and oxidation resistance at temperature rather than wet corrosion at all.
Key Properties
- Resistance to reducing acids in the B grades, and to oxidising and reducing media in the C grades
- Resistance to pitting, crevice attack and chloride stress-corrosion cracking
- Low carbon content in the C grades, to resist sensitisation when welded
- High-temperature strength and oxidation resistance in Hastelloy X
Grades Supplied
| Grade | UNS | Type | Chosen for |
|---|---|---|---|
| Hastelloy B2 | N10665 | Ni-Mo | Reducing acids, especially hydrochloric at all concentrations |
| Hastelloy B3 | N10675 | Ni-Mo | As B2, with better thermal stability and fabricability |
| Hastelloy C4 | N06455 | Ni-Cr-Mo | High-temperature stability, resists sensitisation after welding |
| Hastelloy C22 | N06022 | Ni-Cr-Mo | Broad resistance across oxidising and reducing service |
| Hastelloy C276 | N10276 | Ni-Cr-Mo | The general-purpose choice; wet chlorine, hypochlorite, seawater |
| Hastelloy C2000 | N06200 | Ni-Cr-Mo-Cu | Copper added for sulphuric acid alongside the usual range |
| Hastelloy G30 | N06030 | Ni-Cr-Fe-Mo | Phosphoric acid and mixed-acid pickling |
| Hastelloy N | N10003 | Ni-Mo-Cr | Molten fluoride salts |
| Hastelloy X | N06002 | Ni-Cr-Fe-Mo | Strength and oxidation resistance at temperature, gas turbine parts |
Designations are as stated on each grade page. Confirm the specification against the mill certificate for the batch supplied.
Available Forms
Where These Alloys Are Used
- Chemical processing — reactors, heat exchangers, columns and piping in acid service
- Pollution control — flue gas desulphurisation, scrubbers and ducting
- Pulp and paper — bleaching plant, where wet chlorine chemistry attacks stainless
- Pharmaceutical — vessels and agitators where product purity rules out iron pickup
- Oil and gas — sour service components and downhole tooling
- Gas turbines — combustion cans and transition ducts, in Hastelloy X
Certification and Cutting
Material is supplied against EN 10204 3.1 mill test certificates, with chemical composition and mechanical properties for the batch. Cutting to size is done in house.
Ask for a Quotation
Tell us the grade, the form, the size and the quantity, and we will confirm availability, lead time and price. Contact us for stock availability, pricing and material test certificates.