Bar and Rod
Plate and Sheet
Strip
Pipe and Tube
Wire
Welding
Powder Material
Cast Products
Forged Products
Fittings
Fastening
Round Bar:
φ2–500 mm, 1–6 m length
Flat/Square Bar:
4–100 mm thickness/width
Hex Bar:
A/F 3–100 mm
Hollow Bar:
OD 20–300 mm
Sheet:
0.3–6 mm thickness
Medium Plate:
6–25 mm thickness
Heavy Plate:
25–100 mm thickness
Standard Strip:
0.05–3 mm thick,
10–600 mm wide
Precision strip:
0.01–0.5 mm thick,
tight tolerance ±0.005 mm
Foil:
0.005–0.1 mm thick
Seamless Tube:
OD 6–450 mm,
WT 1–50 mm,
1–12 m length
Welded Tube:
OD 10–600 mm,
WT 1–20 mm
Capillary Tube:
OD 1–10 mm,
WT 0.1–2 mm
Wire Form:
Cold Drawn Wire,
Bright Wire,
Spring Wire,
Fine Wire,
Ultra-fine Wire
General Diameter:
φ0.1–10 mm
Coil Weight:
50–500 kg,
customizable tolerance
Solid Wire:
φ0.8–4.0 mm
Flux-cored Wire:
φ1.2–4.0 mm
Welding Rod:
φ2.0–5.0 mm
Powder Form:
AM 3D Printing Powder,
Spherical Powder,
Gas-atomized Powder,
Water-atomized Powder
Particle Size:
10–150 μm
Sphericity:
≥90% for AM grade
Cast Ingot:
φ200–800 mm
Precision Casting:
min wall 0.5 mm
Cast Pipe:
OD 100–600 mm,
WT 10–50 mm
Forged Bar:
Φ35–500 mm
Forged Ring:
OD 200–2000 mm
Forging Weight:
1–5000 kg
Fittings Form:
Elbow, Tee, Reducer, Flange, Cap, Outlet, Lap Joint
Size range:
1/2''–24'' (DN15–DN600)
Wall thickness:
Sch10–Sch160, STD, XS, XXS
Pressure Class:
150–2500 LB
Fastening Form:
Bolt, Nut, Screw, Stud, Washer, Pin, Rivet
Metric: M3–M64
Imperial: #4–2.5''
Length: 6–500 mm
Alloy C-276 is a nickel-molybdenum-chromium-tungsten corrosion-resistant alloy. This datasheet presents the material within the American (ASTM / ASME / UNS) standard system.
By far the most widely used member of the C family, Alloy C-276 is a wrought, low-carbon improvement of the original alloy C, offering universal corrosion resistance across a wide range of severe environments. Its high molybdenum and nickel contents give exceptional resistance to pitting, crevice corrosion and reducing media such as hydrochloric and sulfuric acids, while its chromium content provides resistance to oxidizing media. It is one of the few materials able to withstand wet chlorine gas, hypochlorite and chlorine dioxide. The very low carbon and silicon contents minimise grain-boundary carbide precipitation during welding, so the alloy resists intergranular attack in the weld heat-affected zone and can be used in the as-welded condition. It is a single-phase, solid-solution alloy supplied in the solution-annealed condition.
Typical applications include chemical and petrochemical processing, flue-gas desulfurisation and pollution-control scrubbers and stack liners, pulp-and-paper, and waste-treatment equipment.
| Property | Value | Unit |
|---|---|---|
| Density | 8.89 | g/cm³ |
| Melting range | 1325–1370 | °C |
| Elastic modulus | 205 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 11.2 | µm/m·°C |
| Thermal conductivity (20 °C) | 9.8 | W/m·K |
| Specific heat (20 °C) | 427 | J/kg·K |
| Structure | Austenitic (FCC), single phase | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel | Ni | Balance | — | Base element; reducing-media resistance |
| Molybdenum | Mo | 15.0 | 17.0 | Pitting / crevice / reducing-acid resistance |
| Chromium | Cr | 14.5 | 16.5 | Oxidizing-media resistance |
| Tungsten | W | 3.0 | 4.5 | Reducing-media / localized-corrosion resistance |
| Iron | Fe | 4.0 | 7.0 | Residual |
| Cobalt | Co | — | 2.50 | Residual |
| Vanadium | V | — | 0.35 | Residual |
| Carbon | C | — | 0.010 | Very low; minimises carbide precipitation |
Solution-annealed condition, typical values for UNS N10276.
| Condition | Property | Value |
|---|---|---|
| Solution annealed | Tensile strength (UTS) | ≥690 MPa (100 ksi) |
| Solution annealed | 0.2% yield strength | ≥283 MPa (41 ksi) |
| Solution annealed | Elongation at break | ≥40 % |
| As-welded | Corrosion resistance | Retained (low carbon) |
| — | Elastic modulus | 205 GPa |
Confirm against the mill test report. The very low carbon content preserves corrosion resistance in the weld heat-affected zone.
| Environment | Performance | Notes |
|---|---|---|
| Reducing acids (HCl, H₂SO₄) | Excellent | High molybdenum + nickel |
| Wet chlorine / hypochlorite / ClO₂ | Excellent | One of few alloys that resist these |
| Pitting / crevice corrosion | Excellent | Molybdenum + tungsten |
| Stress-corrosion cracking | Excellent | High nickel content |
| Oxidizing acids (HNO₃) | Good | Chromium-bearing; less than C-22 |
The high molybdenum and tungsten content gives outstanding resistance in reducing and chloride-bearing environments — including wet chlorine, hypochlorite, ferric and cupric chlorides, contaminated acids and seawater — with exceptional resistance to localized attack; resistance in strongly oxidizing acids is good but lower than higher-chromium grades such as C-22.
A single-phase solid-solution alloy; not hardenable by precipitation. Properties are set by solution annealing.
Solution Anneal Solution anneal at approximately 1120 °C (2050 °F) and rapidly quench (water or rapid air cool) to dissolve secondary phases and retain maximum corrosion resistance. The alloy is not strengthened by heat treatment; cold work raises strength.
Excellent weldability; readily welded by the gas-tungsten-arc and gas-metal-arc processes with matching filler (ERNiCrMo-4), and used in the as-welded condition owing to its very low carbon content. No post-weld heat treatment is normally required.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Excellent | Matching C-276 filler (ERNiCrMo-4) |
| GMAW / MIG | Good | Matching filler |
| SMAW / stick | Good | Matching electrode (ENiCrMo-4) |
Weld with matching filler and clean surfaces; the alloy may be used as-welded without post-weld heat treatment.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Machinability | Difficult; work-hardens, rigid setups, sharp tooling |
| Speeds | Slow speeds, positive feeds, no dwelling |
| Coolant | Ample coolant |
Forming Processes
| Process | Notes |
|---|---|
| Cold forming | Good; work-hardens, anneal between heavy operations |
| Hot forming | 1010–1175 °C; solution anneal afterward |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Chemical / petrochemical | Reactors, evaporators, heat exchangers, piping | Reducing-acid + chloride resistance |
| Pollution control | Scrubbers, stack liners, ducts, dampers | Wet-chlorine + acid resistance |
| Pulp & paper | Bleaching equipment | Chlorine / chloride resistance |
| Marine / waste | Components, waste-treatment hardware | Seawater + mixed-media resistance |
| Product Form | ASTM Standard | AMS / ASME |
|---|---|---|
| Plate, sheet and strip | ASTM B575 | ASME SB-575 |
| Bar, rod and forgings | ASTM B574 / B564 | AMS 5750 |
| Seamless pipe and tube | ASTM B622 | ASME SB-622 |
| Welded pipe and tube | ASTM B619 / B626 | ASME SB-619 |
Nickel-molybdenum-chromium-tungsten corrosion-resistant alloy. UNS N10276.
| Alloy | Mo % | Cr % | W % | Best Used For |
|---|---|---|---|---|
| Alloy C-276 | 15–17 | 14.5–16.5 | 3–4.5 | Family standard Ni-Mo-Cr-W; reducing media, wet chlorine, mixed acids |
| Hastelloy C-22 | 12.5–14.5 | 20–22.5 | 2.5–3.5 | Higher-chromium; better oxidizing-media resistance |
| Hastelloy C-4 | 14–17 | 14–18 | — | Thermally stable Ni-Cr-Mo alloy |
| Inconel 625 | 8–10 | 20–23 | — | General Ni-Cr-Mo-Nb corrosion / strength |
| Hastelloy B-3 | 27–32 | 1–3 | — | Ni-Mo alloy for hydrochloric acid |
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