AMS 5842H MP159 Round Bar

AMS 5842H MP159 round bar is a cobalt-nickel superalloy achieving ultra-high tensile strength exceeding 1830 MPa (265 ksi) through cold work and aging.

Delivery :

FOB

minimum order :

50 kilograms

Supply Ability :

5000kilograms / Month

Stock Time :

7-10Day

Country of Origin :

CHINA

Quantity :

Contact Now

AMS 5842H covers MP159 cobalt-nickel-chromium alloy in the form of bars up to 1-3/4 inch (44 mm) nominal diameter or thickness. MP159 is a multiphase nickel-cobalt based superalloy that achieves ultra-high strength through a combination of cold work and aging. With ultimate tensile strength exceeding 1830 MPa (265 ksi), it offers an exceptional balance of strength, toughness, ductility, and corrosion resistance, making it indispensable for aerospace fasteners, jet engine components, marine hardware, and petroleum industry equipment .

1. Product Specifications & Physical Data

AMS 5842H specifies MP159 round bar for high-strength, corrosion-resistant, and heat-resistant applications. The alloy is supplied in the cold worked and aged condition to achieve its optimum mechanical properties.

Available Forms: Round bar (up to 44 mm diameter / 1-3/4 inch) .
Specifications: AMS 5842H, AMS 5841, AMS 5843, UNS R30159, NACE MR0175/ISO 15156 .

Chemical Composition (Weight %)	MP159 Specification
Cobalt (Co)	Balance
Nickel (Ni)	24.0 - 27.0
Chromium (Cr)	18.0 - 20.0
Molybdenum (Mo)	6.0 - 8.0
Iron (Fe)	8.0 - 10.0
Titanium (Ti)	2.5 - 3.25
Niobium (Nb)	0.20 - 0.80
Aluminum (Al)	0.10 - 0.30
Carbon (C)	0.04 max.
Manganese (Mn)	0.20 max.
Silicon (Si)	0.20 max.
Phosphorus (P)	0.020 max.
Sulfur (S)	0.010 max.

Physical Properties	Metric	Imperial
Density	8.33 - 8.45 g/cm³	0.301 - 0.305 lb/in³
Melting Range	1340 - 1400°C	2445 - 2550°F
Modulus of Elasticity	210 - 220 GPa	30.5 - 32.0 × 10⁶ psi
Poisson's Ratio	0.31	0.31

Mechanical Properties (Cold Worked + Aged)	Value	Unit
Tensile Strength (min.)	1830 MPa	265 ksi
Yield Strength (0.2% offset, min.)	1720 MPa	250 ksi
Elongation (min.)	8%	8%
Reduction of Area (min.)	35%	35%
Hardness (min.)	38 HRC	38 HRC

2. Fabrication & Material Comparison

Cold Working: 45-50% cold reduction is essential to activate age-hardening response; material supplied in cold worked condition .
Aging: 650-700°C (1200-1290°F) × 4-8 hours, air cool; develops full strength after cold work .
Machining: Difficult due to high strength and work-hardening rate; requires rigid setups, slow speeds, positive feeds, and ample coolant .
Welding: Limited weldability; components typically mechanically fastened rather than welded .
Material Comparison:

Property Comparison	MP159	MP35N	Inconel 718	17-4 PH
Tensile Strength (min.)	265 ksi	260 ksi	185 ksi	190 ksi
Corrosion Resistance	Excellent	Excellent	Good	Good
Sour Service (NACE)	Yes	Yes	Yes (limited)	Yes (H1150M)
Service Temperature	590°C	590°C	650°C	315°C
Fabricability	Moderate	Moderate	Good	Good

3. Applications

Aerospace: High-strength fasteners (bolts, studs), jet engine components, landing gear hardware
Oil & Gas: Downhole tools, wellhead components, valve stems, packers, completion equipment
Marine: Subsea connectors, seawater handling components, propeller shafts
Medical: Prosthetic devices, orthopedic implants, surgical instruments
Industrial: High-strength springs, torsion bars, fasteners for corrosive environments

Contact ZYTC Alloy for certified AMS 5842H MP159 round bar with full traceability, NACE MR0175 certification, material test reports, and competitive pricing. Available in standard sizes up to 44 mm diameter.

Email: daisy@zytcsteel.com

WhatsApp/WeChat: +86 17335753350