| Analysis | Mechanical_Properties | Applications | Machineability_and_Weldability | Heat_Treating | Tolerances | Speedy Metals items |
440C is a high carbon chromium stainless steel, capable of developing high hardness and high mechanical properties by conventional heat treating methods. 440C exhibits best corrosion resistance in the hardened condition. It has excellent resistance to wear and abrasion and is magnetic in all conditions. It develops the highest hardness of the stainless steels.
416 stainless generally conforms to ASTM A276, ASTM A580, AMS 5630
The above values are average and may be considered as representative of 440C stainless
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. 440C resists scaling up to 1200° F in continuous service and resists corrosion from fresh water steam, crude oil, gasoline, and resists staining from fruit and food acids. Maximum resistance is obtained by hardening and polishing
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.
Hardening range is between 1850° 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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ROUND (drawn, smooth turned, or ground) |
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|
size (inches) |
OVER |
UNDER |
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.044 to 5/16, incl |
0.001 |
0.001 |
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5/16 to 1/2, excl |
0.0015 |
0.0015 |
|
1/2 to 1, excl |
0.002 |
0.002 |
|
1 to 1-1/2, excl |
0.0025 |
0.0025 |
|
1-1/2 to 4, incl |
0.003 |
0.003 |
|
4-1/8 to 4-1/2, incl |
0.005 |
0.005 |
|
4-9/16 to 6, incl |
0.008 |
0.008 |