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UNS S21900/XM-10 Stainless Steel Plate, XM-10 Stainless Steel Round Bar Manufacture

Short Description:

Stainless steel is a versatile material widely used in various industries due to its excellent corrosion resistance, durability, and aesthetic appeal. One such stainless steel grade is XM-10, which stands out for its exceptional properties and wide range of applications. In this article, we will delve into the chemical composition, mechanical properties, applications, processing standards, as well as available forms like plates, sheets, and round bars, offering you an in-depth understanding of XM-10 stainless steel.

S21900 stainless steel is an austenitic stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. XM-10 is the ASTM designation for this material. S21900 is the UNS number. Additionally, the common industry name is 21-6-9.


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Chemical Composition:

XM-10 stainless steel is classified as an austenitic stainless steel and is also known as UNS S21900 or Nitronic® 32. It is composed of the following elements:

  • Chromium (Cr): 26-28%
  • Nickel (Ni): 3.5-4.5%
  • Manganese (Mn): 1.0-2.0%
  • Silicon (Si): 0.80% max
  • Nitrogen (N): 0.20-0.40%
  • Carbon (C): 0.03% max
  • Phosphorus (P): 0.04% max
  • Sulfur (S): 0.03% max

Mechanical Properties:

XM-10 stainless steel exhibits remarkable mechanical properties, making it suitable for demanding applications. The typical mechanical properties of XM-10 stainless steel are as follows:

  • Tensile Strength: 90 ksi (620 MPa)
  • Yield Strength: 45 ksi (310 MPa)
  • Elongation: 35%
  • Hardness: HRB 95


XM-10 stainless steel finds extensive use in various industries thanks to its unique combination of outstanding corrosion resistance, high strength, and good formability. Some prominent applications include:

  1. Aerospace Industry: XM-10 stainless steel is employed in aircraft structural components, such as landing gear, fasteners, and engine parts, where high strength, fatigue resistance, and corrosion resistance are crucial.
  2. Chemical Processing: It is well-suited for chemical processing applications due to its excellent resistance to corrosion from various chemicals and solutions, including acids, alkalis, and saltwater environments.
  3. Marine Environments: XM-10 stainless steel’s superior resistance to pitting and crevice corrosion makes it ideal for marine applications such as boat fittings, propeller shafts, and seawater pump components.
  4. Automotive Industry: It is used in automotive exhaust systems, catalytic converters, and components exposed to high-temperature gases, thanks to its elevated temperature strength and oxidation resistance.
  5. Petrochemical Industry: XM-10 stainless steel is favored in the petrochemical industry for its ability to withstand aggressive environments encountered in oil refining, gas processing, and chemical plants.

Processing Standards:

XM-10 stainless steel follows various processing standards to ensure uniformity, quality, and compatibility with industry requirements. Some common processing standards associated with XM-10 stainless steel include:

  • ASTM A276: Standard Specification for Stainless Steel Bars and Shapes.
  • ASTM A240: Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications.
  • ASTM A312: Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes.
  • AMS 5848: Aerospace Material Specification for Nitronic® 32 (XM-10) Stainless Steel, Hot Rolled and Cond. A.

Plate, Sheet, and Round Bar Forms:

XM-10 stainless steel is available in various forms to meet the diverse needs of different applications. The most common forms include plates, sheets, and round bars.

  • Plates: XM-10 stainless steel plates are available in different thicknesses, widths, and lengths. They are suitable for structural components, pressure vessels, and industrial equipment exposed to corrosive environments.
  • Sheets: XM-10 stainless steel sheets are used in applications where flat surfaces with precise dimensions are required, such as architectural cladding, kitchen appliances, and decorative elements.
  • Round Bars: XM-10 stainless steel round bars offer excellent strength and corrosion resistance, making them ideal for manufacturing shafts, fasteners, valves, and other precision components.


XM-10 stainless steel, also known as Nitronic 32, offers exceptional corrosion resistance, high strength, and good formability, making it a sought-after material across various industries. With its well-balanced chemical composition, notable mechanical properties, and compatibility with industry standards, XM-10 stainless steel is suitable for critical applications in aerospace, marine, automotive, petrochemical, and chemical processing sectors. Whether in the form of plates, sheets, or round bars, XM-10 stainless steel proves to be an excellent choice for projects that require durability, reliability, and superior performance.

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