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440C is a high carbon chromium stainless steel, capable of developing highhardness and high mechanical properties by conventional heat treatingmethods. 440C exhibits best corrosion resistance in the hardened condition. It has excellent resistance to wear and abrasion and is magnetic in allconditions. It develops the highest hardness of the stainless steels.

APPLICATIONS

440C is used for bearings, nozzles, wear parts of pumps, mold inserts,knives, surgical tools, etc. 440C is used for severe service such as valves,needle valves, balls and seats for check valves and ball bearings. 440Cresists scaling up to 1200° F in continuous service and resistscorrosion from fresh water steam, crude oil, gasoline, and resists stainingfrom fruit and food acids. Maximum resistance is obtained by hardening andpolishing.

MACHINEABILITY AND WELDABILITY

Machinability is rated at 40% of B1112. Average cutting speed 65 ft/min. 440C has poor welding properties due to high carbon content. 440C has poor forming and stamping properties. 440C can be forged between 1900°-2100° F. Do not forge below 1650° F. Cool slowly.

HEAT TREATING

Hardening range is between 1850° F and 1950° F. Quench large sections in oil. Small sections can be quenched in air. Temper to required hardness. Annealing Full annealing range is between 1550° and 1650° F. Cool slowly in furnace. Low annealing range is between 1550° and 1650° F. Cool slowly in furnace.

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