MP35N 2.4999 Superalloy – Ultra-High Strength Nickel-Cobalt-Chromium-Molybdenum Alloy | FUSHUN SPECIAL STEEL
Introduction & Applications
MP35N is a premium nonmagnetic nickel-cobalt-chromium-molybdenum superalloy renowned for its exceptional combination of ultra-high tensile strength, outstanding ductility, and superior corrosion resistance. As a professional manufacturer, FUSHUN SPECIAL STEEL produces MP35N through advanced vacuum induction melting (VIM) followed by vacuum arc remelting (VAR) to ensure the highest quality standards.
This alloy can achieve tensile strength up to 300 ksi (2068 MPa) through cold work hardening, phase transformation, and aging processes. MP35N demonstrates exceptional resistance to sulfidation, high-temperature oxidation, and hydrogen embrittlement, making it ideal for the most demanding applications.
Key Applications
Aerospace & Energy
- High-strength fasteners and springs
- Gas and oil well service components
- Sour environment equipment
- Turbine engine components
Medical & Industrial
- Orthopedic implants and surgical instruments
- Dental and cardiovascular devices
- Nonmagnetic electrical components
- Precision instrument parts
MP35N Chemical Composition
Applicable specifications: AMS 5758, AMS 5844, AMS 5845, ANSI/ASTM F562 | UNS R30035
| Element | Ni | Co | Cr | Mo | Fe | Ti |
|---|---|---|---|---|---|---|
| Content (%) | 33.00-37.00 | Balance | 19.00-21.00 | 9.00-10.50 | Max 1.00 | Max 1.00 |
| Element | Mn | Si | C | S | P | B |
|---|---|---|---|---|---|---|
| Content (%) | Max 0.15 | Max 0.15 | Max 0.025 | Max 0.010 | Max 0.015 | Max 0.015 |
MP35N Mechanical Properties
Room Temperature Tensile Properties
| Condition | Cold Reduction (%) | 0.2% Yield Strength (ksi/MPa) | Ultimate Tensile Strength (ksi/MPa) | Elongation (%) | Hardness (HRC) |
|---|---|---|---|---|---|
| Work Strengthened | 25 | 150 / 1034 | 170 / 1172 | 28 | 34 |
| 35 | 154 / 1062 | 194 / 1336 | 22 | 42 | |
| 55 | 205 / 1413 | 265 / 1827 | 12 | 47 | |
| 65 | 235 / 1620 | 280 / 1931 | 11 | 50 | |
| Work Strengthened + Aged (1000°F/538°C, 4hrs) | 25 | 175 / 1207 | 186 / 1282 | 24 | 39 |
| 45 | 251 / 1731 | 257 / 1772 | 12 | 46 | |
| 53 | 290 / 1999 | 300 / 2068 | 10 | 50-51 |
Elevated Temperature Tensile Properties (Aged 1050°F/565°C, 4 hours, Air Cooled)
| Test Temperature (°F/°C) | 0.2% Yield Strength (ksi/MPa) | Ultimate Tensile Strength (ksi/MPa) | Elongation (%) | Reduction of Area (%) |
|---|---|---|---|---|
| Room | 285 / 1965 | 294 / 2027 | 10.0 | 46 |
| 400 / 204 | 248 / 1710 | 260 / 1793 | 8.0 | 44 |
| 600 / 316 | 236 / 1627 | 250 / 1724 | 8.0 | 41 |
| 800 / 426 | 225 / 1551 | 240 / 1655 | 4.0 | 8 |
Fatigue Strength (R.R. Moore Bending)
| Condition | 10⁶ Cycles (ksi/MPa) | 10⁷ Cycles (ksi/MPa) | 10⁸ Cycles (ksi/MPa) |
|---|---|---|---|
| Cold Drawn & Aged to 220 ksi (1517 MPa) | 100 / 689 | 90 / 620 | 88 / 606 |
| Cold Drawn & Aged to 265 ksi (1827 MPa) | 108 / 744 | 99 / 682 | 97 / 668 |
Note: MP35N is included in NACE MR-01-75 to a maximum hardness of 35 HRC, or 51 HRC in specific cold reduced plus aged conditions for sour service environments.
MP35N Heat Treatment
Annealing
MP35N should be annealed at 1900-1950°F (1038-1066°C) for 1 to 4 hours, followed by air cooling. This process restores ductility for subsequent forming operations.
Aging
After work hardening, MP35N can be aged at 1000-1200°F (538-649°C) for increased strength. For optimum properties, cold worked MP35N should be aged at 1000-1100°F (538-593°C) for 4 hours, then air cooled.
Important: The alloy will respond to aging only if first work strengthened. No increase in strength will result from aging annealed material. Service temperatures up to 750°F (399°C) are suggested for the fully work hardened condition.
MP35N Equivalent Standards & Specifications
| Standard | Specification/Designation |
|---|---|
| UNS | R30035 |
| ASTM (USA) | ASTM F562 |
| AMS (USA) | AMS 5758, AMS 5844, AMS 5845 |
| ISO (International) | ISO 5832-6 (Surgical Implants) |
| NACE | MR-01-75 (Sulfide Stress Cracking Resistant) |
| DIN/EN (Europe) | 2.4999, NiCo20Cr20Mo |
MP35N Product Forms & Supply Range
As a professional manufacturer, FUSHUN SPECIAL STEEL supplies MP35N superalloy in various forms through hot rolling and hot forging processes. We welcome bulk orders and can accommodate special size requirements.
| Product Form | Process | Size Range |
|---|---|---|
| Round Bars | Hot Rolled / Hot Forged | Ø15mm – Ø350mm |
| Flat Bars | Hot Rolled / Hot Forged | Thickness: 10mm – 150mm |
| Plates | Hot Rolled | Thickness: 6mm – 100mm |
| Wire / Wire Rod | Hot Rolled | Ø5.5mm – Ø25mm |
| Billets | Hot Forged | Ø100mm – Ø500mm |
* Custom sizes and special requirements are available upon request. Contact us for your specific needs.
Why Choose FUSHUN SPECIAL STEEL as Your MP35N Manufacturer?
🔥 In-House Melting Capabilities
We operate our own ESR (Electroslag Remelting), VIM (Vacuum Induction Melting), and VAR (Vacuum Arc Remelting) facilities to produce premium quality MP35N superalloy with exceptional cleanliness and homogeneity.
⚙️ Complete Heat Treatment
Our in-house heat treatment facilities ensure consistent quality and precise property control. We can deliver MP35N in annealed, work hardened, or aged conditions per your specifications.
✨ Precision Finishing Services
We offer bright turning and centerless grinding services in-house. This saves our customers time and reduces costs by eliminating the need for secondary processing at downstream facilities.
🚀 Fast Delivery & Bulk Orders
As a direct manufacturer, we offer stable quality, competitive pricing, and fast lead times. We especially welcome large volume orders and can establish long-term supply agreements.
Ready to Order MP35N Superalloy?
As a leading manufacturer of specialty steel and superalloys, FUSHUN SPECIAL STEEL is your trusted partner for high-quality MP35N. Contact our technical team today to discuss your requirements. Bulk orders and custom specifications are welcome!
Visit us at: www.fushunspecialsteel.com
