Nandini Steel holds ISO 9001:2015 certification as a stockist and supplier, and Hastelloy plate sits right in its certified scope as a named specialty. The company supplies genuine mill-origin C276 in plate, pipe, bar and fittings, all ex-stock. Every order ships with an EN 10204 3.1/3.2 mill test certificate.
Hastelloy C276 at a glance
- Designation: UNS N10276 goes by the trade name Alloy C-276, or Werkstoff 2.4819 in European notation. It's a nickel-base Ni-Mo-Cr alloy, part of Nandini's nickel alloys range.
- Chemistry drivers: Nickel carries the balance, with roughly ~15–17% molybdenum, ~14.5–16.5% chromium and ~3–4.5% tungsten worked in. Carbon stays capped at ≤0.01%.
- Corrosion rating: PREN climbs past 68 here, well clear of the stainless ladder. 304 sits near 18, 316 around 24, 904L about 34, and super-duplex 2507 roughly 43. C276 leaves every one of them behind.
- Service window: It stands up to wet chlorine, hypochlorite, ferric and cupric chlorides, plus hot contaminated acids of both the reducing and oxidising kind.
- Standard & forms: Solution-annealed to ASTM B575, it's supplied as plate, sheet, pipe, round bar, flanges and fittings.
Chemical composition
Hastelloy C276 (UNS N10276) is a nickel-base alloy. Its combined molybdenum and tungsten content gives it strong resistance to crevice attack and reducing acids. The carbon stays very low, at or below 0.01%, which means the alloy keeps its corrosion resistance even as-welded. No post-weld solution anneal needed.
| Element | Composition (wt%) |
|---|---|
| Nickel (Ni) | Balance (~57) |
| Molybdenum (Mo) | 15.0–17.0 |
| Chromium (Cr) | 14.5–16.5 |
| Iron (Fe) | 4.0–7.0 |
| Tungsten (W) | 3.0–4.5 |
| Cobalt (Co) | ≤2.5 |
| Manganese (Mn) | ≤1.0 |
| Vanadium (V) | ≤0.35 |
| Silicon (Si) | ≤0.08 |
| Carbon (C) | ≤0.01 |
| Phosphorus (P) | ≤0.04 |
| Sulfur (S) | ≤0.03 |
Mechanical properties
The values below show minimum room-temperature requirements for solution-annealed C276 plate under ASTM B575. Certified figures are reported per heat on the mill test certificate, and actual numbers can differ from these minimums.
| Property | Minimum (solution-annealed plate) |
|---|---|
| Tensile strength | ≥690 MPa (100 ksi) |
| Yield strength (0.2% offset) | ≥283 MPa (41 ksi) |
| Elongation (in 50 mm) | ≥40% |
| Hardness | ≤~90 HRB |
Physical properties
Density of 8.89 g/cm³ drives plate weight, and it's heavier than austenitic stainless. Account for that when calculating delivered tonnage and support loads.
| Property | Value |
|---|---|
| Density | 8.89 g/cm³ |
| Melting range | ~1325–1370 °C |
| Thermal conductivity (RT) | ~10.2 W/m·K |
| Elastic modulus | ~205 GPa |
| Mean CTE (20–100 °C) | ~11.2 µm/m·°C |
| Magnetic response | Non-magnetic |
Corrosion behavior
C276 is the Ni-Mo-Cr workhorse you reach for when a medium mixes oxidising and reducing acids with chlorides and nothing cheaper holds up. Roughly 16% molybdenum and 3.5% tungsten give it outstanding resistance to pitting and crevice corrosion. The nickel matrix, meanwhile, makes it nearly immune to chloride stress-corrosion cracking, the failure mode that limits austenitic stainless grades. A PREN above 68 lets it stand up to wet chlorine, hypochlorite, ferric and cupric chlorides, and hot contaminated sulfuric and hydrochloric acids. Carbon content is kept very low, so it stays resistant to intergranular corrosion even as-welded. When oxidising acid resistance needs to go further still, Hastelloy C22 is the closest sibling worth weighing against Hastelloy.
Equivalent grades and designations
| System | Designation |
|---|---|
| UNS | N10276 |
| Werkstoff (W.-Nr.) | 2.4819 |
| EN | NiMo16Cr15W |
| Common name | Alloy C-276 |
| AISI | Not applicable (nickel-base alloy) |
Available forms, sizes and standards
C276 comes in both flat and long products, each made to its governing ASTM/ASME standard. Every form sits ex-stock, ready for immediate dispatch. Plate thickness, pipe sizes and schedules, and bar diameters that aren't on the shelf get sourced against firm order. Welding calls for matching filler ERNiCrMo-4 (FM C-276).
| Form | Governing standard | Source |
|---|---|---|
| Plate, sheet, strip | ASTM B575 / SB-575 | In stock |
| Round bar / rod | ASTM B574 | C276 round bar |
| Seamless & welded pipe / tube | ASTM B622 / B619 | Hastelloy C276 pipe |
| Flanges & forgings | ASTM B564 | Hastelloy flanges |
| Pipe & forged fittings | ASTM B366 / B564 | pipe fittings & forged fittings |
| Fasteners | Matching N10276 bar stock | C276 fasteners |
Applications
C276 earns its cost in the environments that defeat stainless and even super-austenitics:
- Flue-gas desulfurization (FGD): scrubbers, ducts and liners see condensing acids plus chlorides, C276's combined oxidising/reducing resistance is why it is the default liner alloy.
- Chemical and acid processing: reactors, heat exchangers and columns handling hot contaminated sulfuric and hydrochloric acids rely on the Mo+W chemistry to resist both general attack and localized corrosion.
- Oil and gas and pulp & paper: sour well components and chlorine-dioxide bleaching equipment use C276 for its chloride-SCC immunity and hypochlorite resistance.
How C276 compares
Within the nickel corrosion-alloy ladder, step up to Hastelloy C22 when oxidising acids and localized corrosion dominate, since its higher chromium and lower tungsten edge out C276 in strongly oxidising media. Inconel 625 offers higher strength with niobium strengthening but trades some reducing-acid resistance. Where the duty is sulfuric-acid-dominated rather than mixed, the copper-bearing Alloy 20 is often the economical choice before a full Ni-Mo-Cr alloy is warranted. Sibling Hastelloy C2000 and Hastelloy X cover copper-modified and high-temperature variants respectively.
Testing, MTC and how to order
Every C276 order comes with an EN 10204 3.1/3.2 mill test certificate (MTC), giving heat and cast traceability back to genuine mill plate from producers such as Aperam, Outokumpu, Jindal, POSCO, Nippon Steel and JFE. Positive material identification (PMI) confirms the molybdenum and tungsten content. Intergranular-corrosion testing per ASTM A262 can be furnished on request, if that's needed. Pricing is quoted live against your spec, so just send thickness or size, form and quantity for an RFQ.
Nandini Steel's been in business since 2003, with over 20 years of supply across 307+ projects, 260+ clients and 36+ export countries. Reach them at reachus@nandinisteel.com, +91 22 43404600 or WhatsApp +91 99202 09184 (GSTIN 27ADJPA7240C1Z0).