MP35N Alloy
MP35N is a cobalt-chromium-based alloy known for its excellent combination of strength and corrosion resistance making it suitable for harsh environment applications. It is comprised of cobalt, chromium (19-21%), nickel (33-37%), molybdenum (9-10.5%), with small additions of carbon, manganese, silicon, phosphorus, sulfur, titanium, iron, and boron.
It offers high tensile strength, excellent resistance to corrosion and can be cold worked to achieve the desired mechanical properties, it is also biocompatible, generally well-tolerated by the human body and used in medical applications. MP35N typically develops a highly polished surface when processed, usually silvery-grey like other cobalt-chromium alloys.
Chemical Composition
| Element | Content(%) |
| Nickel (Ni) | 33 – 37% |
| Chromium (Cr) | 19 – 21% |
| Molybdenum (Mo) | 9 – 10.5% |
| Titanium (Ti) | 1% |
| Iron (Fe) | 1% |
| Manganese (Mn) | 0.15% |
| Silicon (Si) | 0.15% |
| Carbon (C) | 0.025% |
| Phosphorus (P) | 0.015% |
| Cobalt (Co) | Remainder |
Physical Properties
| Properties | Metric | Imperial |
| Density | kg/cm³ | lb./in³ |
Mechanical Properties
| Properties | Metric | Imperial |
| Tensile Strength | 1793 MPa | 260 ksi |
| Yield Strength (@ proof 0.200%) | 1586 MPa | 230 ksi |
| Elastic Modulus | GPa | Ksi |
| Poisson’s Ratio | ||
| Elongation at Break | ||
| Hardness, Rockwell B | ||
| Hardness, Brinell |
Thermal Properties
| Properties | Metric | Imperial |
| Thermal Expansion co-efficient (@ 100 – 538°C/212 – 1000°F) | µm/m°-C | µin/in°F |
| Thermal Conductivity (@21°C / 70°F) | W/mK | BTU in/hr.ft².°F |
Fabrication and Heat Treatment
Machinability
MP35N can be machined once cold worked and aged. Use high-speed steel or carbide and make use of cutting fluids such as soluble oil, sulfurized oil, or chlorinated oil.
Welding
Use the same process and precautions as with 304 stainless steel.
Cold Working
Cold working is critical for MP35N. For further hardening, age after cold work.
Applications
MP35N is used in aerospace, medicine, mining, offshore, and the oil and gas industries. It is used in the following applications:
- Fasteners
- Springs
- Wire
- Cables
- Medical prostheses
- Pump shafts
- Valve stems
- Pressure housings
- Cold-worked tubing
Formats Supplied
Vulcan Metal Group supplies MP35N in sheet, bar and rod form. Custom machined and finished parts supplied to print. Please contact us for more information on how Vulcan Metal Group can help you.
Address
Vulcan Metal Group LLC
23888 Madison Street
Torrance, CA 90505
United States
Phone / Fax
Phone: +1 310.882.6841
Fax: +1 310.893.0579
Cage Code
8FCY8
Quality Policy: Vulcan Metal Group, LLC. supplies mission critical, special purpose materials, and products at a competitive price. The company’s quality system is registered to ISO 9001 and AS9100 and follows its principles for the governance of the business. An active continual improvement program and compliance with all applicable OSHA, federal, and state regulations is maintained.