CWI Nickel Prime Series MP35N® is a multi-phase, nickel-cobalt based alloy that has a unique combination of ultrahigh tensile strength, good toughness, and excellent corrosion resistance.
MP35N® is a true superalloy: it maintains its toughness, ductility, and corrosion resistance in a range of environments from cryogenic temperatures up to 850°F (454°C), and is virtually immune to crevice and stress corrosion. MP35N® is highly resistant to sulfide stress corrosion cracking and provides excellent performance in the most demanding sour well environments, making it a highly sought-after alloy for oil & gas extraction. It’s a preferred choice for jobs and applications like medical devices, aerospace engines, and springs.
MP35N® Composition
| C | Mn | P | S | Si | Cr | Ni | Mo | Ti | Fe | Co | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | 19.0 | 33.0 | 9.0 | ||||||||
| Max | 0.025 | 0.15 | 0.015 | 0.01 | 0.15 | 21.0 | 37.0 | 10.5 | 1.0 | 1.0 | balance |
Commercial use of the alloy is governed by industry standards such as: AMS 5844, 5845 (capable), ASTM F562, NACE MR0175 (ISO 15156-3), NACE MR0103 (ISO 17945)
Aerospace use is supplied via AMS 5678G which further controls the material with additional qualification tests on the final drawn wire’s microstructure.
MP35N® has a face centered cubic (FCC) microstructure in the annealed condition. This is like other nickel and cobalt-based alloys. The primary strengthening mechanism is the partial transformation of the FCC structure to a hexagonal close-packed (HCP) structure. The FCC phase is stable above 1200°F, whereas the HCP structure is stable below 800°F. However, the transformation from FCC to HCP cannot occur by temperature alone and requires mechanical deformation. Age hardening without mechanically deforming the materials to form the HCP structure has little effect because the cobalt-molybdenum phase forms at the interfaces between HCP platelets and the FCC matrix. Yield strengths greater than 260 psi (1793 MPa) are possible in the high-strength condition.
Due to Alloy MP35N®’s high combination of strength, high modulus values, and good corrosion resistance, Alloy MP35N® is used in:
- Medical Devices
- Dental Products
- Aerospace and Defense
- Fasteners
- Oil & Gas
- Engines
- Pressure Housings
- Springs
- Torsion Bars
- Seals
Contact a CWI sales representative to learn more about this specialty alloy and how it can be applied to your industry.
Packaging Options
- Coil
- Spools
- Bars
- Custom Packaging Available
