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No one knows hard-to-machine materials better than Wisconsin Metal Tech. We can supply specialty metals for your application, then provide expert, precise CNC machining and finishing.
Type 440 C stainless steel is available in:
The following specifications are generally applicable:
Because of the high carbon content, this alloy has an abrasive action on cutting tools. In the annealed condition, its machinability rating is about 40% compared to Bessemer oven stock (AISI B1112). As heat treated, the 440C series is difficult to machine because of its high hardness. For parts that require extensive machining, the free-machining versions, Type 440F or Type 440F Se, offer improved machining properties.
Because of their high hardenability, these steels are seldom welded. However, satisfactory welds are possible by preheating parts to 500 degrees F before welding, followed by a 6- to 8-hour anneal at 1350 - 1400 degrees F and air cooling. When weld rods are required, a composition similar to the parent metal should be used.
If annealed for maximum softness 440C Stainless Steel can be moderately cold formed with only slightly more difficulty than the lower carbon, lower chromium grades of stainless steel. It can also be hot headed. Preheating in the range of 1400 - 1500 degrees F insures the best results in hot working. Parts should be furnace cooled after hot working to prevent cracking.
This stainless steel has good corrosion resistance in the hardened and stress relieved conditions. Hence, it should, usually, be used only in that condition. This steel is resistant to such conditions as fresh water, steam, crude oil, gasoline, perspiration, and alcohol.
When forging, preheat to 1400-1500 degrees F, then heat slowly and uniformly to 1900-2150 degrees F. Do not forge below 1700 degrees F.
PROCESS ANNEAL: Heat at 1350-1450 degrees F, then cool very slowly in the furnace.
FULL ANNEAL: Heat uniformly at 1550-1600 degrees F, soak and cool slowly in furnace to 1000-1250 degrees F at a rate of 20-50 degrees F per hour, then cool in air, oil, or water.
HARDENING: Preheat slowly to 1450 degrees F and soak, then raise temperature to 1850-1950° F, quench in warm oil or air. Products hardness of C55-58 Rockwell.
STRESS RELIEVE: Heat to 300-800 degrees F for 1 to 3 hours, air cool.