AMS5843 specification covers a high-strength, corrosion- and heat-resistant cobalt-chromium-nickel alloy (MP159 / UNS R30159) in the form of bars. MP159 is a nickel-cobalt-based multiphase alloy that, through work strengthening and aging, exhibits ultimate tensile strength levels in excess of 1830 MPa (265 ksi). This combination of properties enables ultra-high strength, toughness, good ductility, and excellent corrosion resistance. MP159 is used across many industries, including prosthetic devices, jet engine components, fasteners, marine applications, and petroleum industry applications.
Specifications & AvailableMP159 is a multiphase superalloy that achieves its ultra-high strength through a carefully controlled three-step process: solution heat treatment, cold drawing (work strengthening), and final aging. The AMS5843 condition represents the fully processed, ready-to-use state with maximum mechanical properties. Available Forms: Round bar (cold drawn and aged) Specifications: AMS5843 (solution heat treated, cold drawn, and aged), AMS5841 (solution heat treated only), AMS5842 (solution heat treated and cold drawn), UNS R30159, NACE MR0175/ISO 15156
Operating Conditions & Selection CriteriaMP159 cold drawn and aged bar is specified when designers require the absolute highest strength (exceeding 265 ksi) combined with excellent corrosion resistance, toughness, and good ductility for mission-critical applications. Ultra-High Strength: Through 45-50% cold reduction followed by aging, MP159 achieves tensile strength exceeding 1830 MPa (265 ksi) — among the highest of any commercially available superalloy Corrosion Resistance: Excellent resistance to seawater, chlorides, and sour gas environments; NACE MR0175/ISO 15156 approved for H₂S service Toughness & Ductility: Maintains good ductility (8% elongation minimum) and fracture toughness even at ultra-high strength levels Service Temperature: Reliable performance from cryogenic temperatures up to 593-649°C (1100-1200°F) Fatigue Strength: Exceptional high-cycle fatigue properties essential for rotating and cyclic loaded components Biocompatibility: Suitable for prosthetic devices and orthopedic implants Material Purity: Produced using VIM+VAR double melting for exceptional cleanliness and consistency
Comparison of AMS5841, AMS5842, and AMS5843 Conditions| Specification | Condition | Tensile Strength | Yield Strength | Elongation | Typical Application Stage |
|---|
| AMS5841 | Solution Heat Treated | 160 ksi max | 90 ksi max | 30% min | Soft condition — machining/forming | | AMS5842 | Solution Heat Treated + Cold Drawn | 260 ksi min | 250 ksi min | 8% min | Work strengthened — prior to aging | | AMS5843 | Solution Heat Treated + Cold Drawn + Aged | 265 ksi min | 250 ksi min | 8% min | Fully processed — ready for service |
ApplicationsAerospace: High-strength fasteners (bolts, studs, nuts), jet engine components (turbine blades, shafts), landing gear hardware, drive systems, actuator rods Oil & Gas: Downhole tools, wellhead equipment, valve stems, packers, completion hardware, sour gas service (NACE MR0175 approved) Marine: Subsea connectors, ROV components, propeller shafts, seawater handling systems Medical: Prosthetic devices, orthopedic implants, spinal fixation hardware, surgical instruments Industrial: High-strength springs, torsion bars, high-reliability fasteners for corrosive environments
For inquiries, technical datasheets, or a competitive quote, contact our sales team. We are ready to support your project with certified AMS5843 MP159 cold drawn and aged bar for ultra-high-strength aerospace, oil & gas, marine, and medical applications. Contact Us 📧 Email: daisy@zytcsteel.com
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