Alloy C-276 / UNS N10276
Alloy C-276 / UNS N10276 / 2.4819 – Ultimate Corrosion Resistance for Demanding Chemical Environments
Properties of Alloy C-276 / UNS N10276 / 2.4819
Alloy C-276 / UNS N10276 / 2.4819 is a nickel-chromium-molybdenum alloy offering exceptional corrosion resistance across a wide range of aggressive chemical environments. It resists pitting, stress corrosion cracking, and grain boundary precipitation in weld zones, making it ideal for use in the as-welded condition.
Key Features:
- Nickel-based alloy with Cr, Mo, W; ~57% Ni
- Near-universal corrosion resistance in oxidizing and reducing environments
- Resistant to pitting, crevice, and stress corrosion cracking
- Excellent media resistance: chlorides, seawater, hot acids
- High strength and good toughness
- Cold formming applicable
- Good weldability (low C & Si content)
Applications of Alloy C-276 / UNS N10276 / 2.4819
Alloy C-276 / UNS N10276 / 2.4819 is ideal for applications demanding high dimensional precision:
- Chemical plants (reactors, heat exchangers)
- Refineries, H₂S-containing processes, offshore equipment
- Flue gas desulfurization, emission control, environmental systems
- Pulp & paper bleaching, digesters
- Pharmaceutical & food industry, hygienic systems
Specification Overview
| Material number | 2.4819 |
| Alloy | C-276 |
| EN designation | NiMo16Cr15W |
| UNS | N10276 |
| Böhler Grade | L276 |
| Semi-finished products (strip, sheet, pipe, rod) | DIN 17744, 17750–17752 |
| Forged or rolled pipe flanges | ASTM B462 / ASME SB462 |
| Sheet, plate and strip | ASTM B575 / ASME SB575 |
| Rods, bars | ASTM B574 / ASME SB574 |
| Welded pipes | ASTM B619 / ASME SB619 |
| Seamless pipes | ASTM B622 / ASME SB622 |
| Pipe fittings | ASTM B366 / ASME SB366 |
| Forgings | ASTM B564 / ASME SB564 |
| Sour Gas Applications | NACE MR0175 / ISO 15156 |
| Pressure vessel approval | AD 2000, VdTÜV 400 |
| Pressure vessel code | ASME BPVC Sec. II Part B |
Physical Properties:
| Property | Value |
|---|---|
| Material Density | ~8.9 g/cm³ |
| Melting Point | 1325–1370 °C |
| Thermal Conductivity (20 °C) | ~10 W/(m·K) |
| Electrical Resistivity | ~1.3 Ω·mm²/m |
| Thermal Expansion (20–100 °C) | ~11 × 10⁻⁶/K |
| Magnetism | Practically non-magnetic (μr < 1.01) |
Mechanical Properties:
In solution-annealed
| Property | Typical Value |
|---|---|
| Tensile Strength Rm | ~750 MPa |
| Yield strength (Rp0.2) | ~300–350 MPa |
| Elongation A5 | 50–60 % |
| Elastic Modulus | ~205 GPa |
| Hardness | ~87 HRB / ~180 HB |
Typical Chemical Composition:
Element Content (wt. %)
| Ni | Co | Mo | Mn | Cr | V | Fe |
| Balance (~57) | ≤ 2.5 | 15.0–17.0 | ≤ 1.0 | 14.5–16.5 | ≤ 0.35 | 4.0–7.0 |
| Si | W | P | C | S | ||
| ≤ 0.08 | 3.0–4.5 | ≤ 0.04 | ≤ 0.010 | ≤ 0.03 |
Product Portfolio
Sheets, plates, cut-to-size blanks
Rods, bars, wires (rolled, forged, drawn, machined)
Pipes and accessories (fittings, flanges)
Forged parts (discs, rings)
Machined components per drawing (semi-finished / ready-to-install)
All information without guarantee and for informational purposes only.