AMS 5842 MP159 Cobalt Alloy

Product Introduction

MP159 is a multiphase, precipitation-hardened alloy based on the cobalt-nickel-chromium-iron-molybdenum system. Developed as a high-strength upgrade to the MP35N alloy, it incorporates significant amounts of titanium and aluminum and optimizes the heat treatment process. We typically supply the material in the aged condition to ensure peak performance and maintain excellent reduction of area. It is often hailed as the "pinnacle of strength" among commercial alloys. It is used for high-load-bearing bolts for the high-pressure compressor-to-high-pressure turbine shaft connection, seal disk retaining bolts, and turbine disk locking bolts.

 

Implementation Standards and Dimensional References

The condition corresponding to the AMS 5842 specification is solution heat-treated plus cold-worked.

 

This specification covers high-strength, corrosion-resistant, and heat-resistant cobalt-nickel-chromium alloy in bar form, applicable to bars with a nominal diameter (or thickness) of 1-3/4 inches (44 mm), or hexagonal bars with that dimension across flats.

 

Based on current market conditions, we can offer a price of $180–$210 per kilogram, with a minimum order quantity of 50 kg.

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Melting Practice
The alloy shall be produced by multiple vacuum induction melting followed by vacuum consumable electrode melting.

 

Solution Heat Treatment
Bars shall be solution heat treated by heating to a temperature of 1900 to 1925°F (1038 to 1052°C), holding at the selected temperature (±25°F / ±14°C) for 4 to 8 hours, and then water quenching.

 

Heat Treatment Response – Post-Aging
Samples of bars with a nominal diameter of 1-3/4 inches (44 mm) or less, having been solution heat treated and suitably cold-drawn, shall be aged by heating to a temperature of 1200 to 1250°F (649 to 677°C), holding at the selected temperature (±25°F / ±14°C) for 4 to 4-1/2 hours, and cooling at a rate equivalent to air cooling.

1. Material Standards and Grades:

In addition to the commonly used AMS 5842 (Aerospace Material Specification) bar stock, we also supply bars meeting AMS 5841 and AMS 5843 standards.

2. Specifications and Condition (Key Terms):

Aerospace standard specifications for MP159 material typically involve custom diameters, lengths, and strict tolerance requirements (aerospace grade).

3. Core Performance Requirements (Complete Technical Agreement):

Guaranteed Mechanical Properties: Minimum guaranteed values ​​for all four parameters listed in the table above (tensile strength, yield strength, elongation, and reduction of area) must be specified.

Non-Destructive Testing (NDT): "Bars must undergo 100% ultrasonic testing (UT) and comply with AMS 2631 Class AA or stricter standards."

Chemical Composition Report: Complete composition test data is required.

4. Special Requirements:

Metallographic Report: Metallographic images of the bar cross-section are required to confirm a uniform microstructure free from deleterious phases.

Heat Treatment Records: Complete temperature-time records of the multi-stage aging heat treatment for the specific batch of bars must be provided.

Third-Party Testing: Given the specialized nature of aerospace-grade materials, we generally recommend that customers take samples and commission a third party to conduct quality inspections and issue relevant test reports, thereby verifying that the final material meets the required standards.

 Lork Group
 Marketing Operations Department
 Email: layla@lorkgroup.com
 WhatsApp: +86 199 3707 5488

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