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Stainless Steel Alloy 13-8 | Product Properties, Composition & Machinability
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- 13-8
Stainless steel alloy 13-8, also known as UNS S13800, is a precipitation-hardening stainless steel that offers an excellent combination of high strength, toughness, and corrosion resistance. Its unique composition includes 13% chromium, 8% nickel, 2% molybdenum, and small amounts of other elements. This alloy exhibits exceptional mechanical properties, making it ideal for aerospace and other critical applications where high strength and fatigue resistance are required. Additionally, alloy 13-8 can be heat-treated to achieve varying levels of hardness and ductility, providing versatility in design and fabrication processes. Its ability to maintain its properties at both high and low temperatures further enhances its appeal in demanding environments. Overall, stainless steel alloy 13-8 is a reliable and performance-driven material that continues to be a valuable choice for a range of challenging engineering applications.
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
Precipitation hardening stainless steel with high strength, hardness, and excellent toughness and corrosion resistance. Tight chemical composition, low carbon, and vacuum melting allows for good transverse toughness properties.
Typical Uses
Aircraft structural components.
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