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Stainless Steel Alloy 17-4 | Product Properties, Composition & Machinability
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- 17-4
Stainless steel alloy 17-4, also known as UNS S17400, is a precipitation-hardening stainless steel renowned for its remarkable combination of strength, corrosion resistance, and versatility. Composed of approximately 17% chromium, 4% nickel, 4% copper, and small amounts of other elements, this alloy can be heat-treated to achieve various levels of hardness while maintaining its toughness. Its exceptional mechanical properties make it well-suited for applications in aerospace, petrochemical, and medical industries. Stainless steel alloy 17-4 demonstrates excellent resistance to corrosive environments, making it suitable for marine and offshore equipment. Its ability to withstand high temperatures enhances its appeal in demanding engineering and industrial applications. Overall, stainless steel alloy 17-4 remains a favored material choice where strength and corrosion resistance are critical factors.
Product Properties
Chemical
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Alloying Elements
Chromium: Most important element of stainless steel. An addition of 10% chromium will form an oxide film (passive surface film) which renders the steel corrosion resistant. Chromium also increases resistance to scaling.
Nickel: Second most important element. It increases ductility, corrosion resistance, scaling resistance, and high-temperature strength.
Silicon: Primarily increases resistance to scaling.
Manganese: Improves hot-working properties.
Molybdenum: Increases corrosion and high-temperature strength.
Sulfur-Phosphorus-Selenium: Increases machinability.
Titanium or Columbium-Tantalum: Stabilizes carbon and prevents chromium-carbide precipitation and subsequent intergranular corrosion.
Mechanical
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Physical
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Fabrication
Machinability ratings must be recognized as approximate values. They are a reasonable guide to relative tool life and power required for cutting. Variables of speed, cutting oil, feed, and depth of cut will significantly affect these ratios.
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*Based on Bessemer Screw Stock No. B1112
Machinability ratings must be recognized as approximate values. They are a reasonable guide to relative tool life and power required for cutting. Variables of speed, cutting oil, feed, and depth of cut will significantly affect these ratios.
Disclaimer: The data listed here are recommended starting points. Higher speeds and feeds may be obtainable based on the working environment. Keep in mind that speeds and feeds should always be adjusted in small steps. When using carbide tools; surface speed can be increased 2 to 3 times over the suggested values; feeds can be increased between 50 and 100%.
Characteristics
Chromium, nickel, copper, columbium, tantalum, and carbon balanced for high corrosion resistance and hardening by heat treatment.
Typical Uses
Medical components, aerospace industry, and corrosion resistant applications.
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