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Hastelloy C - 22 (UNS N06022, 2.4602) is a nickel - chromium - molybdenum - tungsten alloy known for its excellent corrosion resistance and high - temperature performance. Here is a detailed introduction:
Chemical Composition
| Element Name | Chemical Symbol | Content Range | Function |
|---|---|---|---|
| Nickel | Ni | A large proportion (base metal) | Provides good ductility and toughness; forms a stable matrix to resist corrosion |
| Chromium | Cr | Around 21 - 23% | Forms a dense oxide film on the alloy surface, enhancing resistance to oxidation and corrosion, especially in oxidizing acids |
| Molybdenum | Mo | About 12.5 - 14.5% | Improves the alloy's resistance to pitting and crevice corrosion in chloride - containing environments; enhances high - temperature strength |
| Tungsten | W | Approximately 2.5 - 3.5% | Helps to improve the alloy's hardness and wear resistance; contributes to high - temperature strength |
| Other Elements | Fe, Co, Mn, Si, C, etc. | Small amounts | Further adjust the alloy's properties (e.g., a small amount of carbon is controlled to balance strength and weldability) |
Corrosion Resistance
| Property | Description |
|---|---|
| General Corrosion Resistance | Excellent resistance to acids, alkalis, salts; stable in oxidizing and reducing environments |
| Pitting and Crevice Corrosion Resistance | High resistance in chloride - containing media due to Cr, Mo, etc., preventing local corrosion |
| Stress Corrosion Cracking Resistance | Good resistance, avoiding sudden cracking in harsh environments |
| High - Temperature Heat Resistance | Maintains good mechanical properties and dimensional stability, usable up to 1093°C for long term |
| High - Temperature Oxidation Resistance | Chromium - rich oxide film prevents further oxidation at high temperatures, ensuring service life |
Applications
| Industry | Application Equipment | Function of Hastelloy C - 22 |
|---|---|---|
| Chemical Processing Industry | Reactors, heat exchangers, pipelines, valves | Resist corrosion from various chemical media and ensure equipment normal operation |
| Petroleum and Gas Industry | Oil well pipes, offshore platforms, refinery equipment | Resist corrosion from oil, gas and corrosive media during extraction and refining |
| Environmental Protection Industry | Waste incineration equipment, flue gas desulfurization and denitrification equipment | Resist corrosion from acidic gases and corrosive media in the environment |
| Food and Pharmaceutical Industry | Food processing and pharmaceutical production equipment | Ensure product safety and quality with high corrosion resistance and hygienic performance |
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