Nickel and nickel alloys · Alloy C-276 / Hastelloy C-276 / UNS N10276 / 2.4819
Hastelloy C-276 Alloy (UNS N10276): Engineering Reference Guide for Properties and Applications
Engineering Passport and Standards for Hastelloy C-276 Alloy
| Product Types | Alloy Markings | ASTM Specifications | ASME Specifications | W.Nr. Equivalents | DIN Equivalents | ISO Equivalents |
|---|---|---|---|---|---|---|
| Sheet products, seamless and welded pipes, strips, bands, welding wire, round bars, forgings, forged blanks | Alloy C276, Inconel C-276, Hastelloy C276, Hastelloy C, Nickelvac HC-276, Nicrofer 5716 hMoW, VDM Alloy C-276, UNS N10276 | B 366, B 462, B 564, B 574, B 575, B 619, B 622, B 626, B 751, B 775, B 829 | SB 366, SB 564, SB 574, SB 575, SB 619, SB 622, SB 626, SB 751, SB 775, SB 924 | 2.4819 | NiMo16Cr15W25 (standards 17744, 17750-17754) | NiMo16Cr15Fe6W4 (standards 6207, 6208, 9722-9725) |
Hastelloy C-276 is an engineered nickel-molybdenum-chromium alloy with tungsten additions, developed for critically important applications. EV Group China supplies this alloy, which demonstrates excellent resistance in a wide range of aggressive environments, especially where there is a high risk of localized and crevice corrosion.
Standard Chemical Composition of Hastelloy C-276 Alloy (%)
| Ni | Balance |
|---|---|
| Mo | 15.0-17.0 |
| Cr | 14.5-16.5 |
| W | 3.0-4.5 |
| Co | <2.5 |
| Mn | <1.0 |
| C | <0.01 |
| V | <0.035 |
| P | <0.04 |
| S | <0.03 |
| Si | <0.08 |
| Fe | 4.0-7.0 |
The low carbon content (up to 0.01%) in the EV Group China alloy minimizes sensitization and carbide precipitation in the heat-affected zone of the weld. This ensures the preservation of corrosion resistance in welded structures without the need for subsequent heat treatment, which is critically important for equipment in the chemical industry.
Mechanical Properties at Normal Conditions
| Tensile Strength | Yield Strength (0.2%) | Elongation |
|---|---|---|
| 758 MPa (100 ksi) | 363 MPa (53 ksi) | 62% |
Physico-Thermal Constants of the Material
The material density is 8.89 g/cm³. The alloy is characterized by high structural stability over a wide temperature range, which is reflected in an elastic modulus of 208 GPa (208 kN/mm²).
| Melting Range | Specific Heat Capacity | Coefficient of Linear Expansion | Thermal Conductivity | Electrical Resistivity |
|---|---|---|---|---|
| 1325-1370 °C | 427 J/kg*°C | 12.2 µm/m*°C (at 24-100 °C) | 9.8 W/m*°C | 1.229 µohm*m |
EV Group China products made from C-276 alloy are inert to strong oxidizing agents such as trivalent iron ions (Fe³⁺) and divalent copper (Cu²⁺). It is also resistant to chloride solutions, formic acid, and acetic acid. The alloy is designed to prevent pitting, crevice corrosion, and stress corrosion cracking (SCC).
Welding Technologies and Application Areas
Hastelloy C-276 alloy is amenable to all major welding types, including TIG, MIG/MAG, and plasma welding. To ensure the equivalent strength and corrosion resistance of the welded joint, EV Group China recommends using appropriate welding consumables classified as ERNiCrMo-4 (AWS A5.14) for wire and ENiCrMo-4 (AWS A5.11) for electrodes.
Key Operational Advantages:
- Exceptional resistance in a wide range of oxidizing and reducing chemical processes.
- High corrosion resistance in wet environments containing gaseous chlorine, chlorine dioxide, and hypochlorites.
- Full compliance with NACE MR0175 / ISO 15156 standards for oil and gas industry applications in contact with sour (hydrogen sulfide) environments.
Profiled Application Industries:
- Reactors, heat exchangers, and pipelines in organic and inorganic synthesis processes.
- Equipment for the pulp and paper industry, in particular, digesters and chlorine dioxide pulp bleaching systems.
- Components of flue gas desulfurization systems (scrubbers, absorbers, ducts) at thermal power plants and metallurgical enterprises.
- Equipment for natural gas extraction and processing with high hydrogen sulfide (H₂S) content.
- Process lines for the production of agrochemicals, pharmaceutical substances, and extractive phosphoric acid.