AMS 6490/6491 (M50)

A bearing steel suitable for use within the missile and bearing industry.

M50 is a premium-melted alloy. It offers excellent resistance to multi-axial stresses and good resistance to oxidation. The product is refined using vacuum-induction melting (VIM) and vacuum-arc remelting (VAR) processes.


It possesses high compressive strength suitable for a high speed steel tool. It also has a high degree of cleanliness therefore can be finished to a high lustre.

M50 is a bearing steel suitable for use within the missile and bearing industry, offering high wear resistance and strength at elevated temperatures. Bearings within aircrafts and gas turbines are other typical applications of this alloy.

M50 could also be used in tooling applications where high levels of performance are required.

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Related Specifications

  • AMS 6490
  • AMS 6491
  • ASTM A600 (M 50)
  • ASTM A600 (M50)
  • DIN 1.3551

Properties

Chemical Composition

Applications

  • Aircraft engine bearings
  • Helicopter rotor bearings
  • Gas turbines (requiring hot hardness)
  • High performance racing engines
  • Tooling applications

Characteristics

  • Exhibits excellent resistance to multi-axial stresses and softening at high service temperatures as well as good resistance to oxidation
  • Characteristic of a high-speed tool steel, it possesses high compressive strength
  • Due to the alloy’s high degree of cleanliness, parts are capable of being finished to a high lustre
  • Used in a wide variety of applications for components which require high wear resistance and strength at elevated temperatures

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