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  • Material

    17-4PH, 630, S17400, 1.4542, X5CrNiCuNb16-4, 05Cr17Ni4Cu4Nb

  • Overview

    17-4 Stainless is a martensitic chromium-nickel-copper stainless steel in the solution treated (annealed) condition. It can be further hardened to various strength levels by a single precipitation hardening heat treatment that minimizes scaling and distortion. Its strength and moderate corrosion resistant properties are maintained in service temperatures up to the 600° F to 800° F range. Thesteelshould not be used in the solution treated (annealed) condition.

  • Characteristics

    17-4PH exhibits superior corrosion resistance compared to hardenable 400-Series Stainless chromium grades such as Type 410 Stainless. It is nearly comparable that of 300-Series Stainless chromium nickel grades such as Type 304 Stainless. 17-4PHcorrosion resistance can be affected by surface finish and precipitation hardening heat treatment.

  • Application

    17-4PH isused for applications requiring high strength and a moderate level of corrosion resistance. High strength is maintained to approximately 600°F (316°C).

    Thesteelshould not be used at temperatures above 572°F (300°C) or at very low temperatures. It has adequate resistance to atmospheric corrosion or in diluted acids or salts where its corrosion resistance is equivalent to Alloy 304 or 430.

  • Chemical Composition (wt%)














    Nb (Cb)+Ta





    5 x C~0.45


  • Corrosion Resistance

    Tests have shown that the corrosion resistance of 17-4 Precipitation Hardeningsteelis comparable to that of Type 304 stainless steel in most media. In general, the corrosion resistance of 17-4 alloy is superior to that of the hardenable 400 series stainless steels.

  • Mechanical Property (AMS 5604)

    Annealed condition

    Ultimate Tensile Strength: 185 KSI min (1255 MPa min)

    Yield Strength(0.2% Offset): 160 KSI min(1105 MPa min)

    Elongation: 3% min

    Hardness: 38HRC max.


    Ultimate Tensile Strength: 135 KSl min (930 MPa min)

    Yield Strength: 105 KSl min (725 MPa min)

    Elongation: 8%min

    Hardness: 28-37HRC

  • Heat Treatment

    17-4PHis martensitic structure in the annealed condition and is further strengthened by a low temperature treatment which precipitates a copper containing phase in thesteel. In comparison to manysteelsin the precipitation hardening family,17-4PHrequires a simple heat treatment; a one step process conducted at a temperature in the range 900°F (482°C) to 1150°F (621°C) depending on the combination of strength and toughness desired. A wide range of properties can be produced by this one step heat treatment. Heat treatment in the 900°F (482°C) range produces highest strength, although slightly less than that ofsteellike S17700 or S15700. The latter precipitation hardeningsteels generally require more steps to complete heat treatment.

  • Available Process

    (1)Hot formed, descaled

    (2)Cold worked

    (3)Cold worked and solution annealed

  • Common Tests

    Chemical composition



    Micro structure

    Eddy current

    Surface condition

    Shape and dimension

    Positive Material Identification

  • Product Forms


    Size range

    Capillary tube

    OD 0.08 ~ 6.0 mm

    WT 0.015 ~ 1.5 mm

    Thin wall & Ultra thin wall seamless tube

    OD6.0~80.0 mm

    WT 0.05~4.5 mm

    Micro ID and heavythick wall seamless tube

    OD3.0~50.0 mm


    Precision conic seamless tube

    Bigger end: OD3.0 - 426.0mm

    Smaller end: OD2.5 - 346.0mm

    WT: 0.15 - 40.0mm

    HP/UHP BA+ tube

    EP tube

    OD 1.0 ~ 76 mm

    WT 0.10 ~ 10.0 mm

    Small caliber precision seamless tube

    OD6.0 ~89mm

    WT 0.50 ~9.0 mm

    Profiled seamless tube

    Build to drawing

    Build to specification

    Bourdon tube

    Y40, Y50, Y60, Y70, Y100, Y150

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