AMS 5842 specification covers a high-strength, corrosion- and heat-resistant cobalt-chromium-nickel alloy in the form of bars. MP159 (UNS R30159) is an ultra‑high‑strength nickel‑cobalt multiphase alloy capable of achieving more than 265 ksi (1,830 MPa) tensile strength while still maintaining good ductility, toughness, and corrosion resistance. It is produced using vacuum induction melting (VIM) followed by vacuum arc remelting (VAR) to ensure purity and consistent microstructure. This alloy performs reliably up to about 1100–1200°F (593–649°C) and is used in aerospace, medical, energy, and marine environments. ZYTC Alloy is an ISO 9001 and AS 9120B certified superalloy manufacturer and supplier, offering AMS 5842 MP159 work-strengthened bars at factory-direct prices with full material traceability and fast global delivery.
Chemical Composition – MP159 (UNS R30159) per AMS 5842| Element | Nominal Composition (%) |
|---|
| Cobalt (Co) | 36.0 | | Nickel (Ni) | 25.0 | | Chromium (Cr) | 19.0 | | Molybdenum (Mo) | 7.0 | | Iron (Fe) | 9.0 | | Titanium (Ti) | 2.9 | | Niobium (Cb/Nb) | 0.50 | | Aluminum (Al) | 0.20 | | Carbon (C) | 0.04 max | | Manganese (Mn) | 0.20 max | | Silicon (Si) | 0.20 max | | Phosphorus (P) | 0.015 max | | Sulfur (S) | 0.010 max | | Boron (B) | 0.010 max |
Melting & Refining – VIM + VAR for PurityMP159 is produced using vacuum induction melting (VIM) followed by vacuum arc remelting (VAR) to ensure purity and consistent microstructure. | Melting Process | Abbreviation | Purpose |
|---|
| Vacuum Induction Melting | VIM | Primary melt – low gas content, tight composition control | | Vacuum Arc Remelting | VAR | Secondary melt – improved cleanliness, homogeneous structure |
Benefits of VIM + VAR| Benefit | Result |
|---|
| Low gas content | Reduced hydrogen, oxygen, nitrogen | | High purity | Fewer non-metallic inclusions | | Consistent microstructure | Uniform mechanical properties | | Reliable performance | Predictable service life |
Mechanical Properties – MP159 Work Strengthened Bar (AMS 5842)Work Strengthened Condition (Cold Drawn – As Supplied)| Property | Typical Value | Requirement |
|---|
| Ultimate Tensile Strength | >265 ksi (>1,830 MPa) | Minimum | | Yield Strength (0.2% offset) | 200 – 240 ksi (1,379 – 1,655 MPa) | – | | Elongation | 8 – 15% | – | | Reduction of Area | 20 – 35% | – | | Hardness (Rockwell C) | 42 – 50 HRC | – |
General Properties| Property | Value |
|---|
| Density | 0.303 lb/in³ (8.39 g/cm³) | | Modulus of Elasticity | 31.0 x 10³ ksi (214 GPa) | | Melting Range | 2400 – 2500°F (1316 – 1371°C) |
Temperature Capability| Temperature Range | Performance |
|---|
| Room Temperature | Ultra-high strength | | Up to 1100°F (593°C) | Excellent | | 1100 – 1200°F (593 – 649°C) | Reliable performance | | Above 1200°F (649°C) | Reduced strength |
Ultra-High Strength – Key AdvantageMP159 is an ultra‑high‑strength nickel‑cobalt multiphase alloy capable of achieving more than 265 ksi (1,830 MPa) tensile strength while still maintaining good ductility, toughness, and corrosion resistance. | Alloy | UTS (ksi) | UTS (MPa) | Ductility |
|---|
| MP159 | >265 | >1,830 | Good | | Alloy 718 | 180-200 | 1,240-1,380 | Good | | Alloy 625 | 120-140 | 827-965 | Excellent | | 17-4 PH | 180-200 | 1,240-1,380 | Moderate |
MP159 offers one of the highest strength-to-ductility ratios among commercially available corrosion-resistant alloys.
Processing – Solution Heat Treated and Cold DrawnManufacturing Sequence| Step | Process | Parameters |
|---|
| 1 | Solution Heat Treat | 1900°F – 1925°F (1038 – 1052°C) / 4-8 hours | | 2 | Cooling | Water quench | | 3 | Work Strengthening | Cold drawing (strain hardening) | | 4 | Final Condition | Work strengthened bar |
Solution Heat Treatment Details| Parameter | Value |
|---|
| Temperature | 1900°F – 1925°F (1038 – 1052°C) | | Duration | 4 – 8 hours | | Cooling | Water quench | | Purpose | Prepare for work strengthening |
Work Strengthening (Strain Hardening)| Parameter | Description |
|---|
| Method | Cold drawing | | Mechanism | Strain hardening / work strengthening | | Effect | Increases strength to >265 ksi |
The alloy is solution heat treated and cold drawn to achieve its ultra-high strength properties.
ApplicationsAerospace: High-strength fasteners (bolts, studs), jet engine components, landing gear hardware, drive systems, actuator components Oil & Gas: Downhole tools, wellhead equipment, valve stems, packers, completion equipment, sour gas service (NACE MR0175) Marine: Subsea connectors, seawater handling components, propeller shafts, ROV hardware Medical: Prosthetic devices, orthopedic implants, surgical instruments, spinal fixation hardware Industrial: High-strength springs, torsion bars, high-reliability fasteners for corrosive environments
Contact UsRequest a quote for AMS 5842 / MP159 Work Strengthened Bar (UNS R30159) – 19Cr – 36Co – 25Ni – 7.0Mo – 0.50Cb – 2.9Ti – 0.20Al – 9.0Fe – Solution Heat Treated and Cold Drawn . Please provide: 📧 Email: daisy@zytcsteel.com
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