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21Cr-6Ni-9Mn

UNS #S21900/S21904

21Cr-6Ni-9Mn  (Nitronic 40) 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

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Applications

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)
  • ASTM XM-10/XM-11

Bar

Rounds

Billet

Strip

Wire

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