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Stainless Steel - Grade 17-4 PH / 1.4542

Description

17-4 PH/1.4542 is a martensitic precipitation-hardening stainless steel known for its excellent mechanical properties, high strength, and good corrosion resistance. It is suitable for applications requiring reliability under challenging conditions, making it a popular choice in various industries.

Chemical Composition

The nominal chemical composition of 17-4 PH is as follows:

  • Chromium (Cr): 15.00 - 17.50%
  • Nickel (Ni): 3.00 - 5.00%
  • Copper (Cu): 3.00 - 5.00%
  • Manganese (Mn): 1.00% max
  • Silicon (Si): 1.00% max
  • Carbon (C): 0.07% max
  • Phosphorus (P): 0.04% max
  • Sulfur (S): 0.03% max
  • Columbium + Tantalum (Cb + Ta): 0.15 - 0.45% max

    • Mechanical Properties (Annealed)

    Typical mechanical properties of 17-4 PH in the solution-annealed condition (Condition A) are:

  • Ultimate Tensile Strength (UTS): 160 ksi (1103 MPa)
  • Yield Strength (0.2% Proof): 145 ksi (1000 MPa)
  • Elongation: 5% in 2 inches (51 mm)
  • Hardness: Rockwell C 35

    • Thermal & Physical Properties

  • Density:0.2820 lb/in³ (7850 kg/m³)
  • Melting Range: 2560 - 2625°F (1404 - 1440°C)
  • Electrical Resistivity: 98 microhm-cm
  • Linear Coefficient of Thermal Expansion:
  • 21-93°C: 10.8 μm/m•°C
  • 21-204°C: 10.8 μm/m•°C
  • 21-316°C: 11.2 μm/m•°C
  • 21-427°C: 11.2 μm/m•°C
  • Thermal Conductivity:
  • At 149°C: 17.9 W/m•K
  • At 260°C: 19.5 W/m•K
  • At 460°C: 22.5 W/m•K

    • Other Designations

    • UNS: S17400
    • AMS: 5604
    • ASTM: A693
    • W. Nr./EN: 1.4542

    Fabrication and Heat Treatment

    17-4 PH can be fabricated using standard methods, including welding and machining. It is typically supplied in the solution-annealed condition (Condition A) and can undergo various aging treatments (H900, H1025, H1075, H1100, H1150) to enhance its mechanical properties.

    Heat Treatment Conditions:

  • Condition A: Solution treated at 1038 ± 14 °C (1900 ± 25 °F)
  • Aging:
  • H900: 482 °C (900 °F) for 1 hour
  • H1150: 621 °C (1150 °F) for 4 hours

    • Applications

    17-4 PH is widely used in:

  • Aerospace components
  • Chemical processing equipment
  • Oil and petroleum refining equipment
  • Food processing machinery
  • Nuclear components
  • Fasteners and base plates

    • Supplied Forms

    17-4 PH is available in various forms, including:

  • Coil: Thickness from 0.029” to 0.130”
  • Bar: Diameter from 0.250” to 5.000”

    • Features

  • Excellent corrosion resistance, comparable to Type 304 stainless steel.
  • High strength and hardness after heat treatment.
  • Good weldability and ease of fabrication.

    • DIN Number

    The DIN number for 17-4 PH stainless steel is 1.4542.

    This datasheet provides a comprehensive overview of 17-4 PH stainless steel, highlighting its properties, applications, and specifications relevant for engineering and industrial use.

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