Hastelloy C-4 (UNS N06455 / W.Nr. 2.4610)
Hastelloy C-4 (UNS N06455 / W.Nr. 2.4610) is a nickel-chromium-molybdenum alloy which has improved thermal stability. In this alloy, the tungsten was totally omitted and the iron content was reduced to approximately 1%. The alloy also contains approximately 0.3% Ti. Outstanding high-temperature stability; exhibits good ductility and corrosion resistance after long-time aging at 650 to 1040°C (1200–1900°F). Resists formation of grain-boundary precipitates in weld heat-affected zones, and is suitable for most chemical process applications in the as-welded condition. Has excellent resistance to stress-corrosion cracking and to oxidizing atmospheres up to 1040°C (1900°F). Hastelloy C-4 has exceptional resistance to a variety of chemical process environments, including hot contaminated mineral acids, solvents, chlorine, and chlorine-contaminated media (organic and inorganic, dry chlorine, formic and acetic acids, acetic anhydride, seawater, and brine). The general corrosion resistance of Alloy C-276 and Alloy C-4 was essentially the same in many corrosive environments, except that in strongly reducing media like hydrochloric acid, Alloy C-276 was better; but in highly oxidizing media, the opposite was true, that is, Alloy C-4 was better. Alloy C-4 offers good corrosion resistance to a wide variety of media including organic acids and acid chloride solutions. This alloy has found greater acceptance in European countries in contrast to Alloy C-276, which is more widely used and accepted in the United States.
Equivalent Grades
| Trademark | GB | GOST | ASTM | UNS | DIN | W.Nr. | NF | BS | JIS | SS |
| Hastelloy C-4 | NS3305 | Х15Н60М15 | Hastelloy C-4 | N06455 | NiMo16Cr16Ti | 2.4610 | – | – | – | – |
Chemical Composition, %
| Alloy | C | Si | Mn | P | S | Cr | Ni | Mo | Fe |
| Hastelloy C-4 | ≤0ю01 | ≤0.05 | ≤1.00 | ≤0.025 | ≤0.010 | 14.5-16.5 | Bal | 15.0-17.0 | ≤3.00 |
Typical Physical and Mechanical Properties (RT, Solution annealed)
| Density, g/cm3 | Melting Point, ℃ | Tensile Strength, MPa | Yield Strength, MPa | ELongation, % | Hardness, HB |
| 8.89 | 1325-1370 | 760 | 365 | 62 | – |
Available Products and Specifications
| Rod, Bar, Wire and Forgings | ASTM B462, ASME SB462, ASTM B564, ASME SB564, DIN 17752/17753/17754, ISO 9723/9724/9725
DIN 17752, ISO 9723 |
| Plate, Sheet and Strip | ASTM B575, ASME SB575, ASTM B906, ASME SB906, DIN 17750, ISO 6208 |
| Pipe and Tube | ASTM B622, ASME SB622, ASTM B619, ASME SB619, ASTM B626, ASME SB626, ASTM B751, ASME SB751, ASTM B775, ASME SB775, DIN 17751, ISO 6207 |
| Welding Product | AWS A5.14/ERNiCrMo-7, AWS A5.11/ENiCrMo-7 |
| Others | ASTM B366, ASME SB366, DIN 17744 |
Features
- Hastelloy C-4 attains high temperature stability
- Good ductility & excellent corrosion resistance up to 1900oF
- Suitable for use in chemical processing media
- Prevents stress corrosion cracking and oxidation
Applications
- Pollution control stack liners, ducts, dampers, scrubbers, stack-gas reheaters, fans and fan housings
- Flue gas desulfurization systems
- Chemical processing components like heat exchangers, reaction vessels, evaporators, and transfer piping
- Sour gas wells
- Pulp and paper production, Waste treatment
- Pharmaceutical and food processing equipment
