Based in China, ZYTC Alloy supplies Hastelloy® C-4 (UNS N06455) for applications requiring high thermal stability combined with resistance to both oxidizing and reducing media. The alloy is suitable for chemical processing, nuclear fuel reprocessing, and pollution control systems. 1. Product Specifications & PropertiesAlloy C-4 is a nickel-chromium-molybdenum alloy with controlled carbon and silicon content. It is designed to minimize grain-boundary precipitation during high-temperature exposure, maintaining ductility and corrosion resistance after extended service in the 650-1040°C range. Chemical Composition (%, range)| Element | Content |
|---|
| Chromium, Cr | 14-18 | | Molybdenum, Mo | 14-17 | | Iron, Fe | 3 max | | Cobalt, Co | 2 max | | Manganese, Mn | 1 max | | Titanium, Ti | 0.7 max | | Carbon, C | 0.015 max | | Nickel, Ni | Remainder |
Mechanical Properties (Typical)| Property | Metric | Imperial |
|---|
| Tensile Strength | 738 MPa | 107,000 psi | | Yield Strength (0.2% offset) | 492 MPa | 71,400 psi | | Elastic Modulus | 211 GPa | 30,600 ksi | | Elongation (in 50.8 mm) | 42% | 42% |
2. Operating Conditions & Selection GuidelinesIdeal Media: Resists both oxidizing acids (due to chromium content) and reducing acids (due to molybdenum content). Suitable for contaminated mineral acids, organic acids, flue gas desulfurization environments, and seawater applications Temperature Range: Maintains structural integrity up to 1040°C in oxidizing atmospheres. Designed specifically for applications involving prolonged exposure to the 650-1040°C range where thermal stability is critical Critical Advantage: Unlike C-276, C-4 resists formation of intermetallic phases during thermal aging, preventing loss of ductility and corrosion resistance in welded or heat-exposed components Common Applications: Chemical reactors, heat exchangers, pickling equipment, nuclear fuel reprocessing components, incinerator parts, and pollution control systems
3. Fabrication & Material ComparisonWelding Characteristics: Resists sensitization in the heat-affected zone, allowing as-welded service without post-weld heat treatment for most applications. Suitable for GTAW/TIG, GMAW, and plasma arc welding methods. Submerged arc and oxy-acetylene welding not recommended Heat Treatment: Standard annealing at 1066°C followed by rapid quenching. Good formability using conventional methods Versus C-276: C-4 offers improved thermal stability and maintains higher ductility after aging, making it preferable for equipment operating in the 650-1040°C range. C-276 remains suitable for lower-temperature applications and offers broader corrosion resistance in some mixed-acid environments Product Forms: Available as sheet, plate, bar, seamless and welded pipe, and wire
Contact ZYTC Alloy for application engineering support or to request a quotation. Our technical team can assist with material selection based on your specific process conditions and thermal requirements. Contact Us:Email:daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
