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Hastelloy alloys for chemical filtration
Compare Hastelloy B-2, B-3, C-22 and C-276 for chemical-duty filters. Reducing-acid service, oxidizing species and chloride exposure guide the choice of nickel-molybdenum or nickel-chromium-molybdenum chemistry.
| Exact grade | B-2 / N10665, B-3 / N10675, C-22 / N06022 or C-276 / N10276. |
|---|---|
| Chemical composition | Acids, concentration, chlorides, dissolved metals, oxidizing species and cleaning fluids. |
| Process cycle | Operating and cleaning temperatures, contact time, flow and differential pressure. |
| Filter assembly | Weave, wire diameter, support, welds, interfaces, dimensions and quantity. |
Separate reducing-acid duties from mixed chemical exposure
B-family alloys emphasize nickel-molybdenum chemistry for reducing acids. C-family alloys add substantial chromium to address a wider combination of oxidizing and reducing conditions. For a chemical filter, include the main process medium, dissolved metals, oxidizing contaminants, wash solution and cleaning cycle in one chemistry schedule.
B-3 builds on the nickel-molybdenum family
B-2 and B-3 are different UNS grades. B-3 combines strong resistance to pure reducing acids with improved structural stability compared with B-2 during thermal exposure. Use the exact designation when specifying wire, woven cloth or fabricated parts. The grade identity remains attached to every wetted layer and support.
C-22 and C-276 balance chromium and molybdenum differently
C-22 has higher nominal chromium than C-276, giving it a strong role where oxidizing species accompany corrosive process media. C-276 combines chromium, molybdenum and tungsten for demanding chemical processing and chloride exposure. Both grades are formable and weldable, supporting conversion from metallic media into finished filter assemblies.
Design the joints and cleaning cycle with the media
A chemically resistant filter layer works as part of a complete wetted assembly. Specify the support, frame, end fittings and weld filler along with the cloth. Define seam continuity and sealing surfaces so liquid passes through the intended filtering area. Record cleaning concentration, temperature and contact time as explicit design inputs.
Compare all filter material families
Connect this grade guide with the complete material comparison and the required filter construction.
Materials and alloys overviewHastelloy grade identities and selection roles
A family name is resolved into an exact grade before fabrication.
| Grade | UNS | Alloy family | Selection role |
|---|---|---|---|
| B-2 | N10665 | Nickel-molybdenum | Reducing-acid duties and existing B-2 equipment specifications |
| B-3 | N10675 | Nickel-molybdenum | Pure reducing acids with improved structural stability |
| C-22 | N06022 | Nickel-chromium-molybdenum | Mixed chemical exposure with oxidizing species |
| C-276 | N10276 | Nickel-chromium-molybdenum-tungsten | Broad chemical processing and chloride-bearing media |
C-22 and C-276 nominal composition: mass %
Unmarked values are nominal compositions; ≤ identifies a specified maximum in the producer’s composition summary.
| Element | C-22 | C-276 |
|---|---|---|
| Ni | Balance | Balance |
| Cr | 22 | 16 |
| Mo | 13 | 16 |
| W | 3 | 4 |
| Fe | 3 | 5 |
| Co | ≤2.5 | ≤2.5 |
| Mn | ≤0.5 | ≤1.0 |
| Si | ≤0.08 | ≤0.08 |
| C | ≤0.01 | ≤0.01 |
| V | ≤0.35 | ≤0.35 |
| Cu | ≤0.5 | ≤0.5 |
Nominal composition expresses the alloy design; the material order identifies the governing product specification.
B-3 nominal composition: mass %
Nickel-molybdenum chemistry distinguishes the B-family alloy.
| Element | B-3 |
|---|---|
| Ni | ≥65 |
| Mo | 28.5 |
| Cr | 1.5 |
| Fe | 1.5 |
| W | ≤3 |
| Mn | ≤3 |
| Co | ≤3 |
| Al | ≤0.5 |
| Ti | ≤0.2 |
| Si | ≤0.1 |
| C | ≤0.01 |
| Nb | ≤0.2 |
| V | ≤0.2 |
| Cu | ≤0.2 |
| Ta | ≤0.2 |
| Zr | ≤0.01 |
Unmarked values are nominal. ≥ denotes a minimum; ≤ denotes a maximum.
Connect chemistry to the filter specification
Describe the complete chemical cycle to choose the grade and assembly details.
| Process feature | Material-selection focus | Construction input |
|---|---|---|
| Pure reducing acids | B-family nickel-molybdenum chemistry | Exact grade, concentration, temperature and wetted-part schedule |
| Oxidizing species in mixed media | Chromium-bearing C-family chemistry | Oxidant identity, dissolved metals and cleaning sequence |
| Chloride-bearing process liquid | Localized-corrosion resistance and joint condition | Crevices, supports, seals and surface finish |
| Repeated chemical cleaning | Material response across the full operating cycle | Cleaning solution, temperature, duration and reverse-flow load |
Material selection questions
Are B-2 and B-3 interchangeable names?
B-2 is UNS N10665; B-3 is UNS N10675. B-3 has a distinct composition and improved structural stability. Use the exact grade specified for the component.
How do C-22 and C-276 differ?
C-22 has higher nominal chromium. C-276 has higher nominal molybdenum and tungsten. The balance of reducing acids, oxidizing species and chlorides determines the selection focus.
Why do these tables use nominal composition?
Nominal values describe the alloy design and make the families easy to compare. Maximum and minimum values are marked separately, and the order specifies the applicable material standard.
What is needed for a chemical filter quotation?
Supply the exact alloy, chemical composition and concentration, temperature cycle, flow, differential pressure, media geometry and a drawing of all wetted parts.
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Technical enquiry
Define the dimensions, media, joints and inspection records before confirming the order.