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8620:

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Disclaimer: The content of this page is for general information only and is not to be used for engineering or design. The content of this material specification page was compiled from available public sources and authorities on material properties. Although we believe the information to be corrrect, Metal Stock, Inc. is not responsible for the accuracy of any of the material specifications and only presents this data as general information for our customers.

8620 is an alloy carburizing steel when thermally treated develops a hard outer case with a soft ductile core. Carefully controlled proportions of chromium, nickel, and molybdenum are responsible for the extensive use as a carburizing alloy steel with valuable features, including extreme surface hardenability and good internal strength. 8620 has minimum distortion and growth characteristics. 8620 has good machinability and responds well to polishing.

8620 cold roll bars conform to ASTM A331.
8620 hot roll bars conform to ASTM A322, ASTM A304.
8620 hot roll plate conforms to ASTM A829.

 

General Information about 8620:


APPLICATIONS:

8620 can be used in a multitude of applications including gears, pinions, cams, cranks, clutch shafts, shafting, axles, tie bars, collets, bushings, heavy duty pins, bolting, springs, hand tools, die cases, and a multitude of machinery parts and components.

MACHINING AND WELDING:

8620's machinability rating is at 66% of B1112. Average cutting speed is127 ft/min. 8620 can be forged at 2200 down to 1800 F prior to hardening or carburizing. 8620 is excellent for welding applications.

HEAT TREATING - Forging, Normalizing, and Annealing:

8620 can be hardened to 1500° F followed by water quench. Carburize at 1650° - 1700° F in an appropriate carburizing medium and oil quench to harden. Tempering of carburized parts is done at 250° - 300° F and will result in the alloy having a core strength of approximately 135,000 psi minimum. Tempering of heat treated and water quenched parts (not carburized) is done at 400° - 1300° F, with greater hardness the lower the tempering temperature.

 

 

 

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