WILLIAM WYATT WILSON, MD, MSPH
Osteopathic Medicine at Maryland Ave, Chicago, IL

3970448, Jul 20, 1976

Jun 14, 1973

5/369922

William Wilson - Chicago IL
Charles W. Finkl - Evanston IL

C22C 3840

75129

A method of making a die steel, and the product thereof, in which melting to specified chemical ranges is subordinated to the achievement of a specified final property or properties, such as hardenability, by any combination of elements which will produce the specified final property starting from the most economical scrap mix available. Specifically, when seeking to achieve a minimum hardenability, the minimum required D. sub. I is determined and, after providing minimum qualities of elements needed to ensure attainment of essential use characteristics except hardenability, the lowest cost element which will ensure attainment of the minimum required D. sub. I is added. In the event a maximum practical upper limit of the first hardenability make-up element is reached for any reason, such as refractory attack in the case of manganese, before the required D. sub. I is achieved, the hardenability make-up element selection process may be repeated with successively more expensive elements as often as needed to reach the required D. sub. I.