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17 4PH Stainless Steel Suppliers

17-4PH (also known as Alloy 17-4) is a high-strength, stainless steel made up of chromium, nickel, copper and niobium. With precipitation-hardening and martensitic qualities, alloy 17-4 is both tough and corrosion-resistant. 17-4PH maintains high tensile strength and hardness, up to 316°C, and excellent oxidation resistance up to 593°C. Alloy 17-4 also has good creep-stress rupture properties up to 482°C.

Speak to City Special Metals today if you would like to place an order for 17-4PH material - we can supply in many forms, including plate, round bar and sheet. To get in touch, please call us, or leave us a message using the contact form below.

17-4PH Stockist Range

Product Form Range From Range To
17-4PH Plate icon

17-4PH Plate

6.35mm 76.2mm
17/4PH Round Bar icon

17/4PH Round Bar

6.35mm 640mm
17/4PH Square Bar icon

17/4PH Square Bar

17/4PH Flat Bar icon

17/4PH Flat Bar

17/4PH Sheet icon

17/4PH Sheet


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    Beneficial Properties

    • Flexibility Good workability, weldability and easy to machine
    • Corrosion-Resistant High resistance to certain corrosive environments and elements, fatigue and wear
    • Durability Strong performance, toughness and resilience
    • Magnetic Permeability A high measure of magnetic permeability

    Markets & Applications

    • Aerospace manufacture (undercarriage components, fasteners, rocket fittings
    • Paper mill equipment
    • Nuclear waste casks and production
    • Mechanical components such as: springs, screws, bolts, gears
    • Chemical processing plants and oil and gas production
    • Offshore and marine mechanical components
    • Helicopter deck platforms and foils
    Call City Special Metals +44 1268 774 261

    17-4PH Composition

    Mechanical Properties

    Yield Strength KSI (MPa) ≥ 105 (725)
    Tensile Strength KSI (MPa) ≥ 124 (860)
    Hardness HB ≥255
    Elongation % ≥16
    Impact Charpy-V -46°C J ≥41

    Technical Specifications

    ASTM UNS Werkstoff AISI
    A564 S17400 1.4542 630 Type 630


    Nickel Ni 3.0-5.0
    Iron Fe Balance
    Carbon C 0.7 Max
    Silicon Si 1.0 Max
    Manganese Mn 1.00 Max
    Sulphur S 0.030 Max
    Phosphorus P 0.040 Max
    Chromium Cr 15.00-17.50 Max
    Copper Cu 3.0-5.0
    Niobium Nb 0.15-0.45

    Physical Properties

    Density g/cm³ 7.82
    Melting Point °F 2560-2625
    °C 1404-1440
    Modulus of Elasticity at 20°C MPa 196000
    Thermal Conductivity at 20°C W/m.K 18.4
    Thermal Expansion x10-6/K 10.8
    Electrical Resistivity 10-6Ω.m 0.08
    Poisson’s ratio 0.272

    Contact us about Alloy 17-4 using the details below

    Whether you’re looking for a bulk order of 17 4 PH stainless steel plate, or you need advice on which 17 4PH material would be right for your application, speak to City Special Metals.

    Call City Special Metals +44 1268 774 261

    We offer a bespoke service so, if you don’t see the size or form that you require, contact us either by phone, email or our contact form below, and we will provide a solution to your requirements.