Manufacture of grinding members of ferrous alloys
Patent 3961994 Issued on June 8, 1976. Estimated Expiration Date: 
June 8, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 8, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2773761 3844844 AbstractForged grinding members and a method for their manufacture from white cast iron having a high chromium content comprising heating a bar of white cast iron of 1.5% to 3% by weight carbon, 8 to 25% by weight chromium, 0% to 2% by weight molybdenum at a temperature of 1000° to 1120°C then forming pieces from the bar at the above temperature and thereafter forging these pieces at a second temperature of 1000° to 1070°C followed by hardening with optional intermediate isothermal treatment. The selection of the first and second temperatures depends on the chemical composition of the initial material and on the desired martensitic or austenitic micrographic structure of the desired product to obtain chromium carbides exclusively of the M7 C3 type. | |
