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We are specialists in engineering materials support to improve the aerospace MRO supply chain.

Smiths MRO is a sub-divsion of a larger business - Smiths Advanced Metals.

Smiths MRO focuses on raw material support for the global aircraft maintenance, repair and overhaul market. Our business is supported by a broad and diverse stock range with a dedicated team that provides outstanding service levels required for our industry.

Our dedicated export team ship goods worldwide.

17-4PH Bar (AMS 5643)

Precipitation Hardening Stainless Steel

Our 17-4PH bars provide high strength and reasonable corrosion resistance.

17-4PH is the most common of the precipitation hardening stainless steel grades.

The alloy is produced according to the specification AMS 5643 in bar form and is known for its very high strength and good corrosion resistance. After a single, low-temperature precipitation hardening heat treatment, the alloy promotes excellent mechanical properties and high strength. 17-4PH also benefits from excellent dimensional stability.

Our range of round bars ranges from small diameters such as 0.25” (6.35mm) right up to large sizes, including 12” diameter (304.8mm). We also process your bars to size, in-house to tight tolerances.

Heat Treatment Conditions

17-4PH is hardened by a single temperature heat treatment and is commonly available in Condition A (Annealed) and H1025, although many other heat treatments, including H900, H925, H1025, H1050, H1075, H1100, & H1150. The characteristics of the alloy are dictated by the heat treatment applied.

Use in the MRO Sector

17-4PH finds use in various aerospace applications due to the alloy's attractive performance capabilities. Examples include undercarriage components, landing gear, fasteners, turbine blades and valve parts. Our bars are particularly suited to turbine blade manufacture due to the alloy's ability to retain it's mechanical properties under the harshest operating conditions. Major aircraft engine manufacturers utilise 17-4PH, and the aerospace MRO sector is no exception.

Other Performance Benefits

Our product also benefits from excellent hardness and outstanding wear resistance. Suitability is determined by applications requiring high strength, corrosion resistance, high fatigue strength and good resistance to galling and stress corrosion resistance. The performance of the alloy meets the stringent mechanical properties demanded by the aerospace sector.

Product Features:

    17-4PH bars according to the AMS 5643 specification
    We predominantly supply to Condition A
    See content above for other tempers

    Turbine blades
    Valve parts
    Undercarriage components

    Very high strength
    Good corrosion resistance
    High fatigue strength
    Good galling and stress corrosion resistance

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