MP35N Alloy (UNS R30035)
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Special Steels Division
Wire Division
MP35N (AMS 5844, ASTM B575, ASTM B926)
MP35N is a high-performance, nickel-cobalt-chromium-molybdenum alloy that offers outstanding mechanical properties, excellent resistance to corrosion, and high strength, particularly at elevated temperatures. Known for its exceptional fatigue and stress-corrosion cracking resistance, MP35N is ideal for demanding applications in industries such as aerospace, medical, and chemical processing. This alloy combines the strength of a superalloy with the resistance of corrosion-resistant materials, making it versatile and highly reliable in harsh environments.
MP35N is typically used in applications requiring exceptional strength-to-weight ratios, fatigue resistance, and resistance to corrosive environments such as seawater, acids, and alkaline solutions.
Features of MP35N:
- High Strength: Outstanding tensile strength (up to 280,000 psi) and yield strength, even at elevated temperatures.
- Excellent Corrosion Resistance: Superior resistance to pitting, crevice corrosion, and stress-corrosion cracking, particularly in saline and acidic environments.
- Outstanding Fatigue Resistance: Exceptional performance in applications subjected to cyclic stress and high fatigue environments.
- Non-magnetic: Ideal for use in magnetic-sensitive applications such as medical devices or aerospace components.
- Excellent Weldability: Can be welded easily, with good post-weld strength and corrosion resistance.
- Heat and Oxidation Resistance: Maintains strength at temperatures up to 1000°F (538°C) and resists oxidation in high-temperature applications.
Specifications:
- AMS 5844
- ASTM B575, ASTM B926
- UNS R30035
- ASME SB-575
- NACE MR0175 (for sour gas environments)
Composition of MP35N:
| Element | Percentage |
|---|---|
| Nickel (Ni) | 35-37% |
| Cobalt (Co) | 35-37% |
| Chromium (Cr) | 19-21% |
| Molybdenum (Mo) | 9-10% |
| Iron (Fe) | Balance |
| Carbon (C) | 0.05% Max |
| Manganese (Mn) | 1.0% Max |
| Silicon (Si) | 0.50% Max |
| Sulfur (S) | 0.02% Max |
| Phosphorus (P) | 0.02% Max |
Physical Properties:
| Property | Value |
|---|---|
| Density | 8.24 g/cm³ |
| Melting Point | 1330°C – 1390°C (2426°F – 2534°F) |
| Electrical Resistivity | 0.85 x 10^-6 Ω·m |
| Thermal Conductivity | 15 W/m·K |
| Hardness (BHN) | 350-420 BHN |
| Tensile Strength | 1300 MPa (190,000 psi) |
| Yield Strength | 1100 MPa (160,000 psi) |
| Elongation | 10% |
| Reduction Area | 30% |