Alloy MP159 Cobalt Bar (AMS 5841, AMS 5842, AMS 5843)

MP159 is a cobalt-nickel-chromium-iron-molybdenum multiphase precipitation-hardening alloy. It is a "strength-enhanced version" developed from MP35N by adding significant amounts of titanium and aluminium and optimising heat treatment. We typically supply it in the aged condition, which guarantees optimal performance. In the aged condition, MP159 cobalt alloy easily achieves a yield strength greater than 1650 MPa, a tensile strength greater than 1900 MPa, and maintains a good reduction in area. It is often referred to as the "strength ceiling" of commercial alloys.

The standard for its bars is AMS 5842 (Aerospace Materials Specification). This is the only reliable standard. A common uniform designation is UNS R30059. Based on past customer feedback and market conditions, we have stocked bars in sizes ranging from Ф20mm to Ф60mm, with custom lengths available upon request. We can also provide machining services. It is important to note that special specifications of aerospace standard bars require customisation.

1. Clearly Define Material Standards and Grades (Must be Precise):

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

2. Specifications and Conditions (Lifeline Clauses):

Most specifications related to MP159 materials in general aerospace standards involve customised diameters, lengths, and stringent tolerances (aerospace grade).

Delivery Condition: Refer to the example - "Cold Drawn and Precipitation Hardened (Condition AH)" must be stated in bold capital letters.

3. Core Performance Requirements (Full Technical Agreement):

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

Non-destructive Testing: "Bars must undergo 100% ultrasonic testing (UT), conforming to AMS 2631 Class AA or more stringent standards."

Chemical Composition Report: Complete measurements, particularly for Ti, Nb, and Al, are required.

4. Special Requirements:

Metallographic Report: Metallographic photographs of the bar cross-section are required to confirm a uniform microstructure free of harmful phases.

Heat Treatment Records: Complete temperature-time records for multi-stage ageing heat treatment of this batch of bars are required.

Third-Party Testing: Due to the special nature of aerospace-grade materials, we generally recommend that customers take samples for third-party quality inspection and obtain relevant test reports to confirm that the final material meets standards.

MP159 is mainly used in gas turbine hot section components that are operated in high temperature environment of up to 649°C (1200°F).

• Landing gears and bolt material
• Solid rocket boosters
• Jet engines
• Chemical processing
• Pulp and paper
• Power generation equipment
• Marine equipment

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