Hastelloy Alloys
Hastelloy B-3 (UNS N10675) — Composition, Properties & Supply
Hastelloy B-3 (UNS N10675) is the upgraded successor to B-2. It keeps excellent hydrochloric acid resistance while greatly improving thermal stability, resisting Ni₄Mo and other intermetallic precipitation during mid-temperature processing and welding, which widens the forming and welding window.
What is the chemical composition of Hastelloy B-3?
| Element | Symbol | Content (wt%) |
|---|---|---|
| Ni | Ni | ≥ 65.0 |
| Mo | Mo | 27.0–32.0 |
| Cr | Cr | 1.0–3.0 |
| Fe | Fe | 1.0–3.0 |
| Co | Co | ≤ 3.00 |
| W | W | ≤ 3.0 |
| C | C | ≤ 0.01 |
| Si | Si | ≤ 0.10 |
| Mn | Mn | ≤ 3.00 |
Values are typical specification limits. Actual heat analysis is reported on the EN 10204 3.1 mill test certificate supplied with each shipment.
What are the mechanical properties of Hastelloy B-3?
| Property | Value | Note |
|---|---|---|
| Tensile strength | ≥ 760 MPa | Room temperature |
| Yield strength (0.2% offset) | ≥ 350 MPa | Room temperature |
| Elongation | ≥ 40 % | Gauge length 50 mm / 4D |
| Hardness | ≤ 200 HB | Brinell / Rockwell |
What are the physical properties of Hastelloy B-3?
| Property | Value |
|---|---|
| Density | 9.22 g/cm³ |
| Melting range | 1370–1418 °C |
| Thermal conductivity | 11.0 W/m·K |
| Elastic modulus | 216 GPa |
| Maximum service temperature | 1000 °C |
What are the key characteristics of Hastelloy B-3?
- Handles all HCl concentrations at least as well as B-2
- Much better thermal stability for safer welding and hot forming
- Resists stress-corrosion cracking and intergranular attack
- More tolerant of repeated thermal cycles during fabrication
Where is Hastelloy B-3 used?
- HCl synthesis, absorption and concentration plant
- Acetic acid and anhydride production
- Sulphuric acid alkylation units
- Catalyst recovery systems
Which standards and specifications cover Hastelloy B-3?
What product forms are available?
Frequently asked questions
Why is B-3 recommended over B-2 for new hydrochloric acid equipment?
B-2 precipitates the ordered Ni₄Mo phase when held between 600 and 800 °C, reducing toughness and corrosion resistance. B-3's tuned chemistry delays this precipitation substantially, making rolling, head forming and multi-pass welding safer. For equipment requiring several hot-work passes, B-3 is the more reliable choice.
Need Hastelloy B-3 bar, tube, plate or forgings?
Send the grade, dimensions, standard and quantity. We answer within 10 minutes on working days and quote within 24 hours, with EN 10204 3.1 certification.
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