Its composition includes:
-
- Nickel (Ni): ~64% (base metal)1
- Chromium (Cr): 14–17.5%13
- Molybdenum (Mo): 14–17%13
- Low carbon (C): ≤0.009% to minimize carbide precipitation34.
Similar Grades:
- UNS N06455 (USA), NS3203 (China), 2.4610 (DIN/Germany)34.
Key Properties
Exceptional Corrosion Resistance:
- Resists sulfuric acid, hydrochloric acid, nitric acid, and chloride-induced stress corrosion cracking (SCC)15.
- Maintains integrity in temperatures up to 1040°C with outstanding oxidation resistance36.
High-Temperature Strength:
- Tensile strength: 690 MPa; Yield strength: 276 MPa; Elongation: 40% at room temperature16.
- Retains mechanical stability in 650–1040°C ranges, ideal for thermal cycling applications34.
Weldability & Fabrication:
- Compatible with TIG, MIG, and plasma arc welding; minimal risk of sensitization in heat-affected zones (HAZ)34.
- Requires solution annealing (1025–1125°C) and rapid cooling post-processing to preserve microstructure24.
Production Methods
Hastelloy C4 round bars are manufactured via:
- Vacuum Induction Melting (VIM): Ensures precise control over alloy purity24.
- Hot/Cold Working:
- Hot forging at 1080–900°C followed by water quenching2.
- Cold rolling with intermediate annealing for precision dimensions24.
- Heat Treatment:
- Solution annealing at 1025–1125°C + water quenching26.
- Final grinding/polishing for surface finish and dimensional accuracy2.
Applications in Demanding Industries
Hastelloy C4 round bars are critical for:
- Chemical Processing: Reactors, heat exchangers, and acid storage tanks17.
- Oil & Gas: Downhole tools, sour gas pipelines, and valves17.
- Aerospace: Jet engine components and fuel system parts14.
- Power Generation: Flue gas scrubbers and boiler systems46.
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Certified suppliers offer Hastelloy C4 round bars in diameters 6–300mm, compliant with ASTM B574, DIN 17752, and NACE MR0175 standards24.
