Description

Chemical Composition

(ASTM A276, Bars & Shapes)

Room Temperature Mechanical Properties

(Bar)

Typical Applications

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.

Description

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.

Availability

Austral Wright Metals can supply Nitronic 60 as bar, plate, wire, castings and forging stock.

Physical Properties

Annealed

Corrosion Resistance

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

HSR – Hardened & Stress Relieved

+ – did not gall at stresses up to 345 GPa

Dynamic Coefficient of Friction

Tested in water, self mated

Fabrication

Nitronic 60 can be hot forged. After forging the workpiece must be solution annealed.

Machinability

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.

Heat Treatment

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

Weldability

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

The technical advice and recommendations made in this Product Data Sheet should not be relied or acted upon without conducting your own further investigations, including corrosion exposure tests where needed. Please consult current editions of standards for design properties. Austral Wright Metals assumes no liability in connection with the information in this Product Data Sheet. Austral Wright Metals supplies a comprehensive range of stainless steels, copper alloys, nickel alloys and other high performance metals for challenging service conditions.