UNS N06455 Hastelloy C4 Bar / Rod / Wire / Forging / Plate / Strip Metallographic Stability Oxidation Resistance
UNS N06455 Hastelloy C4 Bar / Rod / Wire / Forging / Plate / Strip Metallographic Stability Oxidation Resistance
UNS N06455 (Hastelloy C4) is a nickel-chromium-molybdenum alloy known for exceptional resistance to strong oxidizing and reducing agents. It offers excellent thermal stability, especially in the 650–1040 °C range, making it ideal for high-temperature chemical processing. C4 resists stress corrosion cracking, pitting, and crevice corrosion, even in hot mineral acids like hydrochloric and sulfuric acid. In bar, rod, and forging form, it’s used for valves, shafts, and structural parts. Wire is commonly applied in welding and corrosive spring environments. Plate and strip are ideal for lining vessels, heat exchangers, and scrubbers. It’s widely used in the chemical, pharmaceutical, power, and pollution control industries due to its long-term durability in aggressive environments.
| Chemical Composition Wt.% | % | Ni | Cr | Fe | C | Mn | Si | Mo | Ti | P | S |
| Min | Bal. | 14 | 14 | ||||||||
| Max | Bal. | 18 | 3 | 0.015 | 1.0 | 0.08 | 17 | 0.7 | 0.04 | 0.03 |
| Physical Constants | Density(g/cm³) | 8.6 | |||||
| Melting Range(℃) | 1335-1380 | ||||||
| Minimum mechanical properties of alloy at room temperature | Typical mechanical properties | Tensile strength Rm N/mm² | Yield strength RP 0.2 N/mm² | Elongation A5 % | Brinell Hardness HB | |||||
| Solution treatment | 690 | 276 | 40 | ≤200 | ||||||
Overview of Hastelloy C-4 (UNS N06455)
Hastelloy C-4 is a nickel-chromium-molybdenum alloy engineered primarily for exceptional thermal stability and resistance to a wide range of corrosive environments, especially at elevated temperatures. It's known for its superior resistance to intergranular corrosion after exposure to high temperatures.
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