C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/39, 148/52,
C21D 1/18 (2006.01) A01B 7/00 (2006.01) A01B 23/06 (2006.01) C21D 9/00 (2006.01)
Patent
CA 1269595
Abstract of the Disclosure A process for increasing surface hardness of a heat-hardenable steel disk, along an annular band intermediate the disk central and edge portions, is disclosed. The process contemplates selecting a first position on the surface of the intermediate annular band. The process contemplates next rapidly heating at the first position a minor portion of the disk surface in relation to the remainder of the disk so as to cause the minor portion to increase in temperature to an elevated temperature ranging from 1400 to 1600 degrees Fahrenheit in a time period of 0.3 to 0.7 seconds. The disk is heated in a manner such that substantially no heat diffuses from the thus-heated portion of the disk to the remainder thereof. The process next contemplates rapidly terminating the heating step to allow the remainder of the steel disk to serve as a heat sink to rapidly cool the thus-heated portion from the elevated temperature to less than 1000 degrees Fahrenheit in 0.75 seconds, and such that warpage of the steel disk is held to within 0.030 inches over the surface of the disk. The process next contemplates selecting a second position spaced from the first position along the annular band, and repeating the rapid-heat and heat-termination stops. Lastly, the process contemplates repeating the position-selection through heat-termination steps until a major portion of the annular band is increased in hardness to at least 50 Rc to a depth of at least 0.015 inches.
523304
Matalis John A.
Watmough Thomas
Case Corporation
Gowling Lafleur Henderson Llp
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