Hastelloy Alloys
Hastelloy C-276 (UNS N10276) — Composition, Properties & Supply
Hastelloy C-276 (UNS N10276) is the most widely used 'universal' corrosion resistant alloy in the Ni-Cr-Mo-W family. Its low carbon and silicon design prevents carbide and intermetallic precipitation in the weld heat-affected zone, so it handles mixed oxidising and reducing media, wet chlorine, hypochlorite and many mineral acids.
What is the chemical composition of Hastelloy C-276?
| Element | Symbol | Content (wt%) |
|---|---|---|
| Ni | Ni | Balance |
| Mo | Mo | 15.0–17.0 |
| Cr | Cr | 14.5–16.5 |
| Fe | Fe | 4.0–7.0 |
| W | W | 3.0–4.5 |
| Co | Co | ≤ 2.50 |
| V | V | ≤ 0.35 |
| C | C | ≤ 0.01 |
| Si | Si | ≤ 0.08 |
| Mn | Mn | ≤ 1.00 |
| P | P | ≤ 0.040 |
| S | S | ≤ 0.030 |
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 C-276?
| Property | Value | Note |
|---|---|---|
| Tensile strength | ≥ 690 MPa | Room temperature |
| Yield strength (0.2% offset) | ≥ 283 MPa | Room temperature |
| Elongation | ≥ 40 % | Gauge length 50 mm / 4D |
| Hardness | ≤ 200 HB | Brinell / Rockwell |
What are the physical properties of Hastelloy C-276?
| Property | Value |
|---|---|
| Density | 8.89 g/cm³ |
| Melting range | 1325–1370 °C |
| Thermal conductivity | 9.8 W/m·K |
| Elastic modulus | 205 GPa |
| Maximum service temperature | 1040 °C |
What are the key characteristics of Hastelloy C-276?
- Handles both oxidising and reducing corrosion — among the most versatile alloys available
- Low carbon (≤0.01%) and silicon (≤0.08%); no post-weld heat treatment needed
- Resists pitting, crevice corrosion and chloride stress-corrosion cracking
- Withstands wet chlorine, hypochlorite, chlorine dioxide and oxidising chlorides
Where is Hastelloy C-276 used?
- FGD absorbers and stack liners
- Chemical reactors, heat exchangers and distillation columns
- Pulp bleaching and chlorine dioxide generation
- Sour (H₂S/CO₂) oil and gas production
- Pharmaceutical and agrochemical synthesis plant
- Waste incineration and effluent treatment
Which standards and specifications cover Hastelloy C-276?
- ASTM B574
- ASTM B575
- ASTM B622
- ASTM B564
- NACE MR0175 / ISO 15156
- UNS N10276
What product forms are available?
Frequently asked questions
How do I choose between Hastelloy C-276 and C-22?
C-22 (UNS N06022) has more chromium (20–22.5%), slightly less molybdenum and tungsten, giving better resistance and thermal stability in oxidising media and mixed acids with a marginally higher PREN. C-276 is more cost-effective in strong reducing acids such as hydrochloric acid and in chlorinated oxidising service. Choose C-22 when the medium swings oxidising or runs hot; choose C-276 when reducing acids dominate and cost matters.
Does C-276 require post-weld heat treatment?
Normally not. With carbon ≤ 0.01% and silicon ≤ 0.08%, the heat-affected zone does not sensitise in the as-welded condition — the key improvement over earlier C-family alloys. A 1120 °C solution anneal and rapid quench is only considered for extremely aggressive media or where stress-corrosion risk from residual stress exists.
Why is Hastelloy C-276 far more expensive than 316L?
It comes down to alloy content: C-276 carries about 16% molybdenum, 15.5% chromium and 3–4.5% tungsten, whereas 316L has only 2–3% molybdenum on an iron base. Molybdenum, nickel and tungsten cost far more than iron and chromium, and melting (usually VIM plus ESR) plus difficult hot working lowers yield, so unit price typically runs 8–15 times that of 316L.
Need Hastelloy C-276 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.
Request a Quote Chat on WhatsApp +86-156-1827-9078