Nickel-molybdenum (B-family) and nickel-molybdenum-chromium (C-family) alloys for the strongest acids and the most aggressive chemical environments.
Hastelloy is the family name for the most corrosion-resistant nickel alloys in process-industry use. The C-family (C276, C22, C4) balances chromium for oxidising-acid resistance with molybdenum and tungsten for reducing-acid and pitting resistance — so broadly useful that C276 is the default "when nothing else works" material.
The B-family (B2, B3) is specialised: near-total molybdenum gives unmatched hydrochloric-acid resistance at all concentrations and temperatures, at the cost of poor resistance to oxidising contaminants — ferric or cupric ions must be excluded.
The grades below are the ones most often asked for. Each grade stays on this page — the material-first way to browse.
UNS N10276 EN / W.Nr. 2.4819
The most versatile corrosion-resistant nickel alloy — wet chlorine, hypochlorite, chlorine dioxide, organic chlorides, sulphuric and hydrochloric acids across mixed oxidising/reducing duty. Weldable without sensitisation.
UNS N06022 EN / W.Nr. 2.4602
Higher-chromium successor to C276 with better oxidising-acid resistance (wet chlorine, nitric acid mixtures) and the best all-round pitting/crevice performance of the C-family.
UNS N06455 EN / W.Nr. 2.4610
Tungsten-free, low-carbon C-family grade with maximum microstructure stability — high-temperature chemical duty where prolonged thermal exposure would sensitise other alloys.
UNS N10665 EN / W.Nr. 2.4617
Nickel-molybdenum alloy for hydrochloric acid at all concentrations and temperatures, and for sulphuric and acetic acid reducing service. Must be shielded from oxidising species (ferric/cupric ions, aerated acids).
UNS N10675 EN / W.Nr. 2.4600
Improved B-family alloy with better thermal stability and fabrication behaviour than B2 — hydrochloric acid and reducing chemical service.
Nominal ranges as published in the common product standards. Values are indicative and for comparison only — always purchase against the current ASTM/EN specification and the mill test certificate.
| Element | Content |
|---|---|
| Nickel (Ni) | bal. |
| Molybdenum (Mo) | 15.0 – 17.0 |
| Chromium (Cr) | 14.5 – 16.5 |
| Tungsten (W) | 3.0 – 4.5 |
| Iron (Fe) | 4.0 – 7.0 |
| Carbon (C) | ≤ 0.01 |
| Element | Content |
|---|---|
| Nickel (Ni) | bal. |
| Chromium (Cr) | 20.0 – 22.5 |
| Molybdenum (Mo) | 12.5 – 14.5 |
| Tungsten (W) | 2.5 – 3.5 |
| Iron (Fe) | 2.0 – 6.0 |
| Element | Content |
|---|---|
| Nickel (Ni) | bal. |
| Chromium (Cr) | 14.0 – 18.0 |
| Molybdenum (Mo) | 14.0 – 17.0 |
| Iron (Fe) | ≤ 3.0 |
| Element | Content |
|---|---|
| Nickel (Ni) | bal. |
| Molybdenum (Mo) | 26.0 – 30.0 |
| Iron (Fe) | ≤ 2.0 |
| Carbon (C) | ≤ 0.02 |
| Element | Content |
|---|---|
| Nickel (Ni) | bal. |
| Molybdenum (Mo) | 27.0 – 32.0 |
| Chromium (Cr) | 1.0 – 3.0 |
| Iron (Fe) | 1.0 – 3.0 |
Typical minimum values for the common product forms in the annealed / solution-treated condition. Actual properties depend on product form, specification revision and heat treatment.
| Property | Value |
|---|---|
| Tensile strength (min, annealed) | 690 MPa |
| Yield strength (min, annealed) | 283 MPa |
| Elongation (min) | 40 % |
| Density | 8.89 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (min, annealed) | 690 MPa |
| Yield strength (min, annealed) | 310 MPa |
| Density | 8.69 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (min, annealed) | 690 MPa |
| Yield strength (min, annealed) | 276 MPa |
| Density | 8.64 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (min, annealed) | 745 MPa |
| Yield strength (min, annealed) | 345 MPa |
| Density | 9.22 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (min, annealed) | 760 MPa |
| Yield strength (min, annealed) | 350 MPa |
| Density | 9.22 g/cm³ |
| Property | Value |
|---|---|
| Melting range (C276) | ≈ 1325 – 1370 °C |
| Thermal conductivity (C276, 20 °C) | ≈ 10 W/m·K |
| Modulus of elasticity (C276) | ≈ 205 GPa |
Hastelloy is offered in the product forms below. Availability varies by grade and size — confirm the exact combination with our sales desk.
Seamless and welded pipes and tubes to ASTM/ASME, IS and BS specifications — including boiler, air-preheater and corten tubes.
Hot-rolled and cold-rolled sheets, plates, coils, circles and flats in standard and cut sizes.
Butt-weld, forged and socket-weld fittings — elbows, tees, reducers, caps, stub ends, olets and nipples.
Weld neck, slip-on, blind, lap joint, socket weld, threaded, spectacle, ring joint, orifice and deck flanges to ASME B16.5, 150# – 2500#.
Bright and black round bars, square and hex bars, flats and wires in stainless, duplex, alloy, carbon and nickel-alloy grades.
Bolts, nuts, studs, washers and threaded rods in alloy and stainless grades.
| Standard | Scope |
|---|---|
| ASTM B622 / ASME SB622 | Seamless nickel-alloy pipe and tube |
| ASTM B575 / ASME SB575 | Nickel-alloy plate, sheet and strip (C-family, B-family) |
| ASTM B366 | Nickel-alloy welded fittings |
| ASTM B564 / SB564 | Nickel-alloy forgings |
| ASTM B574 / SB574 | Nickel-alloy rod and bar |
| ASTM B619 | Nickel-alloy welded pipe |
Hastelloy is supplied to ASTM/ASME specifications with EN 10204 Type 3.1 certification, heat-number traceability and the corrosion/intergranular tests the specification calls for (ASTM G28A for C-family). Independent PMI verification and third-party inspection can be arranged with the enquiry.
C276 is the established all-rounder with the longest service record and easiest availability. C22 has more chromium, so it performs better in strongly oxidising media (nitric/chromic acids, wet chlorine at high temperature) and slightly better in pitting duty. Most mixed-duty chemical plants still default to C276.
B-family alloys resist pure HCl at all concentrations and temperatures, but they are attacked by oxidising contaminants — ferric ions, cupric ions or dissolved oxygen in the acid. If aeration or Fe³⁺ contamination is possible, specify a C-family alloy instead.
Yes, dramatically — C276 covers sulphuric-acid concentrations and temperatures where 316L would suffer rapid attack, which is why it is the standard material for acid regeneration and FGD duty.
Yes. C276/C22 weld with matching fillers (ERNiCrMo-4 / ERNiCrMo-10) and, being low-carbon, do not sensitise at welds — one of the family's key advantages. B-family welding needs care with iron contamination.
Molybdenum, tungsten and chromium make up much of the alloy — high raw-material cost plus demanding melting and processing. Where the duty allows, our engineers can suggest 904L or duplex alternatives at lower cost; for the severest duty there is no substitute.
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