Stainless Steel Nitronic 60 UNS S21800 – Austral Wright Metals
Product Data Sheet – Stainless Steel
Nitronic 60 UNS-S21800
Nitronic 60 is a nitrogen strengthened austenitic stainless steel, with outstanding strength and resistance to wear and galling. It has corrosion resistance better than 304, and pitting resistance better than 316. It is also available in bar as a high strength version, Nitronic 60 HS.
(ASTM A276, Bars & Shapes)
Room Temperature Mechanical Properties
Chain link conveyer belts and other components; chain drives; bolts, nuts and other fasteners; valve stems, seats and trim; fittings for pumps and valves in chemical processing industries; bridge pins; pins, bushings and roller bearings; aerospace applications.
Nitronic 60 stainless steel provides a significantly lower cost solution to wear and galling problems than cobalt bearing and high nickel alloys. It is a high strength austenitic stainless steel strengthened by nitrogen. It differs from more familiar austenitic stainless steels in containing 8% manganese and 4% silicon. The alloy has better uniform corrosion resistance than type 304 in most media. The chloride pitting resistance is superior to type 316, with room temperature yield strength nearly twice that of 304 and 316. In addition Nitronic 60 has excellent high temperature oxidation resistance and good low temperature impact resistance.
Austral Wright Metals can supply Nitronic 60 as bar, plate, wire, castings and forging stock.
The uniform corrosion resistance of Nitronic 60 falls between grades 304 and 316. However, in a wear system, galling or seizure occurs first, then dimensional loss by wear, and finally corrosion. Galling and wear are the first concerns in design. Although the uniform corrosion resistance of Nitronic 60 is not quite as good as 316, it offers better pitting resistance to chlorides, stress corrosion cracking resistance and crevice corrosion resistance than grade 316.
Wear and Calling Properties
Unlubricated Calling Resistance of Stainless Steels
Threshold Galling Stress, MPa
Dynamic Coefficient of Friction
Tested in water, self mated
Nitronic 60 can be hot forged. After forging the workpiece must be solution annealed.
The alloy is difficult to machine, rated at 50% of 304 and 23% of the free cutting carbon steel AISI B1112. Sharp, rigid, carbide tipped tools and well powered machines are recommended, with the use of heavy cuts and slow speeds.
Nitronic 60 is fully austenitic and can not be strengthened by heat treatment. Solution annealing is carried out at 1060°C, followed by water quenching
Nitronic 60 is readily welded by all conventional processes. Autogenous GTAW welds are sound, with wear characteristics approximating to the base metal. GTAW welds in heavy sections are also sound and weld tensile strength is slightly higher than base metal. Wear properties are near but below base metal. Pure argon is used as shielding gas and AWS A5.9 ER 218 filler metal is used. Pre-heating and post heating are not needed.
ASTM Product Specifications