GENERAL PROPERTIES
ATI 410, ATI 420, ATI 425 Modified, and ATI 440A alloys (see composition on Page 2) are hardenable, straight-chromium stainless steels which combine superior wear resistance of high carbon alloys with the excellent corrosion resistance of chromium stainless steels. Oil quenching these alloys from temperatures between 1800°F to 1950°F (982-1066°C) produces the highest strength and/or wear resistance as well as corrosion resistance. A range of as-quenched hardness is achieved in these alloys by varying the carbon level from 0.15% maximum in Type 410 alloy to 0.60-0.75% in ATI 440A alloy.

These alloys are used where strength, hardness, and/or wear resistance must be combined with corrosion resistance.

APPLICATIONS
A major use for these grades of heat treatable stainless steels is in cutlery. Depending on the customer's end-use requirements, cutlery alloys are usually selected with respect to heat treating response, mechanical properties and fabricating characteristics.

Other applications for these grades include dental and surgical instruments, nozzles, valve parts, hardened steel balls and seats for oil well pumps, separating screens and strainers, springs, shears, and wear surfaces.

**HC means higher carbon version of standard grade