21Cr-6Ni-9Mn

UNS #S21904

21Cr-6Ni-9Mn is a high-manganese nitrogen strengthened, austenitic stainless steel that combines high strength in the annealed condition, excellent resistance to oxidation at high temperatures, good resistance to lead oxide, and a high level of corrosion resistance at ambient temperatures. The alloy can be fabricated and formed much the same as 304 and 316, is readily weldable, and remains nonmagnetic after severe cold work.

Type Analysis

  • Carbon (Maximum) 0.03
  • Phosphorus (Maximum) 0.04
  • Silicon (Maximum) 1
  • Nickel (Nominal) 5.50-7.50
  • Manganese (Maximum) 8.00-10.00
  • Sulfur (Maximum) 0.03
  • Chromium (Nominal) 19.00-21.50
  • Iron (Nominal) Balance
  • Nitrogen (Nominal) 0.15-0.40

Applications

chemical process and pollution-control equipment, steam and autoclave applications, and various aircraft engine components

Applicable Specifications

  • AMS 5561 High Pressure Hydraulic Seamless or Welded Tubing
  • AMS 5595 (Plate
  • Sheet
  • Strip)
  • ASTM A276 (Bars and Shapes)
  • ASTM A580 (Wire)
  • AMS 5562 (Seamless Tubing)
  • AMS 5656 (Bar
  • Forging
  • Rings)
  • ASTM A412 (Plate
  • Sheet
  • Strip)
  • MIL-T-9821 (Sheet
  • Plate
  • Strip
  • Bars
  • Shapes
  • Forgings)

Bar

Billet

Rounds

Strip

Wire

Technical Information

RELATED RESOURCES

Browse our growing library of resources including case studies, product brochures, technical data sheets, product selection guides and more.