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US 3,944,444 AGranted
Method for heat treating cylindrical products
AssigneeA. Finkl & Sons Co.
InventorsHarold C. Thiess, Harold N. Jahnke
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AssigneeA. Finkl & Sons Co.
InventorsHarold C. Thiess, Harold N. Jahnke
Estimating the term…
Method and apparatus for producing cylindrical products having a range of hardness through a cross section such as a roll. The method includes conventional forging and heat treatment steps with or without the addition of a rapid water quench derived from direct impingement of a quench medium on the product as it rotates in a horizontal position, followed, as a final heat treatment, by subjection either to direct flame impingement in a horizontal, rotating condition or flame heat in a vertical furnace while rotating, again followed, preferably, by a drastic quench, and, also preferably an extremely low temperature deep freeze operation to thereby convert substantially all austenite to martensite. The invention makes possible the production of rolls capable of usage from original diameter to scrap diameter without reconditioning.
In a method of producing a cylindrical product having a differential radial hardness, such as a mill roll, the steps of
In a method of producing a cylindrical product having a differential radial hardness, such as a mill roll, the steps of
In a method of treating a cylindrical product having a differential radial hardness, such as a mill roll, the steps of
In a method of producing a cylindrical product having a differential radial hardness, such as a mill roll, the steps of
Dependencies are inferred from the claim text.