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Stainless Steel 21-6-9

21-6-9 is a high manganese nitrogen strengthened, austenitic stainless steel. In the annealed condition 21-6-9 it is known for its high strength and resistance to oxidation at high temperatures. It also sports a good resistance to lead oxide and a high level of corrosion resistance. It is formed in a similar fashion to 304 and 316 stainless and is readily weldable. It remains nonmagnetic after severe cold work. It is used in aircraft engine components, steam and autoclave parts as well as chemical and pollution control equipment.

Component Elements Properties Percent
Carbon (maximum) .08%
Chromium 19 – 21.5%
Iron Balance
Manganese 8 – 10%
Nickel 5.5 – 7.5%
Nitrogen .15 – .4%
Phosphorus (maximum) .06%
Silicon (maximum) 1%
Sulfur (maximum) .03%

Mechanical Properties

Property Value
Tensile Strength 142 to 162 ksi
Yield Strength at 0.2% Offset, minimum 120 ksi
Elongation in 2 Inches (50.8 mm), minimum 20%

Select AMS Number:

AMS Number Alloy Type UNS Cross Ref. Spec Misc./Shape
AMS 5561 21-6-9 Stainless Steel S21900 - Tubing 21-6-9
AMS 5562 21-6-9 Stainless Steel S21900 - Tubing 21-6-9
AMS 5595 21-6-9 Stainless Steel S21904  
AMS 5595 Plate 21-6-9 Stainless Steel S21904 - Plate AMS 5595 Plate
AMS 5595 Sheet 21-6-9 Stainless Steel S21904 - Sheet AMS 5595 Sheet
AMS 5595 Strip 21-6-9 Stainless Steel S21904 - Strip AMS 5595 Strip
AMS 5656 21-6-9 Stainless Steel S21904  
AMS 5656 Bar 21-6-9 Stainless Steel S21904 - Bar AMS 5656 Bar
AMS 5656 Forging 21-6-9 Stainless Steel S21904 - Forging AMS 5656 Forging