AMS 4675 specification covers a corrosion-resistant nickel-copper alloy (Alloy 400 / UNS N04400) in the form of bars, forgings, and forging stock. Alloy 400 is a popular nickel-copper alloy that is hardened via cold working, exhibiting high strength, excellent resistance to a variety of acidic and alkaline environments, and good ductility and thermal conductivity. Suitable for temperatures ranging from subzero to 538°C (1,000°F), Alloy 400 is widely used in marine engineering, chemical processing, hydrocarbon processing equipment, and heat exchangers .
1. Product Specifications & Physical DataAlloy 400 is available in bar, forging, and forging stock forms for marine, chemical, and industrial applications requiring excellent corrosion resistance over a wide temperature range. Available Forms: Bar (round, square, hex), forgings, forging stock, billet . Specifications: AMS 4675, ASTM B164, ASME SB-164, UNS N04400, Werkstoff Nr. 2.4360 .
| Chemical Composition (Weight %) | Alloy 400 Specification |
|---|
| Nickel (Ni) | 63.0 - 70.0 | | Copper (Cu) | 28.0 - 34.0 | | Iron (Fe) | 2.5 max. | | Manganese (Mn) | 2.0 max. | | Silicon (Si) | 0.5 max. | | Carbon (C) | 0.3 max. | | Sulfur (S) | 0.024 max. |
| Physical Properties | Metric | Imperial |
|---|
| Density | 8.80 g/cm³ | 0.318 lb/in³ | | Melting Range | 1300 - 1350°C | 2370 - 2460°F | | Modulus of Elasticity | 179 GPa | 26.0 × 10⁶ psi | | Thermal Conductivity (RT) | 21.8 W/m·K | 151 BTU·in/hr·ft²·°F | | Coefficient of Expansion (20-100°C) | 13.9 µm/m·°C | 7.7 µin/in·°F | | Electrical Resistivity | 0.547 µΩ·m | 0.547 µΩ·m | | Curie Temperature | 20 - 50°C (approx.) | 68 - 122°F |
| Mechanical Properties (Bar) | Condition | Metric | Imperial |
|---|
| Tensile Strength (min.) | Annealed | 480 MPa | 70 ksi | | Yield Strength (0.2% offset, min.) | Annealed | 170 MPa | 25 ksi | | Elongation (min.) | Annealed | 35% | 35% | | Reduction of Area (min.) | Annealed | 35% | 35% | | Tensile Strength (min.) | Cold Drawn | 550 MPa | 80 ksi | | Yield Strength (min.) | Cold Drawn | 380 MPa | 55 ksi | | Elongation (min.) | Cold Drawn | 15% | 15% | | Hardness (Annealed) | — | 110 HB | 110 HB | | Hardness (Cold Drawn) | — | 180 HB | 180 HB |
2. Fabrication & Material ComparisonAnnealing: 843-871°C (1550-1600°F) × 10-30 minutes, water quench or air cool; relieves cold work stresses and restores ductility . Hot Working: 927-1177°C (1700-2150°F); reheat as necessary; avoid working below 871°C . Cold Working: Good formability; can be cold drawn, rolled, and forged; work-hardening rate moderate . Machining: Good machinability; requires sharp tools, positive feeds, and adequate lubrication . Welding: Excellent weldability using GTAW (TIG), GMAW (MIG), and resistance welding; matching filler metal (ERNiCu-7) recommended.
3. ApplicationsMarine Engineering: Propeller shafts, pump shafts, valve stems, marine fasteners, seawater piping components Chemical Processing: Pump and valve components, reactor vessels, agitator shafts, process piping Hydrocarbon Processing: Heat exchanger components, distillation column internals, refinery hardware Heat Exchangers: Tube sheets, baffles, support bars for corrosive service Oil & Gas: Downhole components, wellhead equipment, sour gas service HF Acid Service: Alkylation unit components, valves, fittings for hydrofluoric acid handling Aerospace: Fuel system components, hydraulic system parts Fasteners: Bolts, nuts, studs for corrosive environments
Contact ZYTC Alloy for certified AMS 4675 Alloy 400 bar, forgings, and forging stock with complete traceability, certificates, and competitive pricing. Available in annealed and cold-drawn conditions for marine, chemical, and hydrocarbon processing applications. Email:daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
