Metallurgical apparatus – With control means responsive to sensed condition – With means supplying a treating agent
Patent
1993-04-19
1995-01-31
Wyszomierski, George
Metallurgical apparatus
With control means responsive to sensed condition
With means supplying a treating agent
266 87, C21D 1773
Patent
active
053853377
ABSTRACT:
A control arrangement is disclosed for a conventional, atmosphere heat treating furnace which is operated at high temperature and fitted with a vacuum pump to draw rough or soft vacuum levels when heating the work to heat treat temperatures. The control arrangement utilizes a hydrogen--inert gas furnace atmosphere continuously metered into the furnace to produce a reducing gas mixture to prevent oxidation of the work. If oxidation conditions are sensed, the mass flow is automatically increased while vacuum levels are maintained constant. A unique oxygen probe mounting arrangement is disclosed which enables a conventional oxygen probe to give fairly accurate and consistent readings for fast, automatic process control.
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GRI Report #08/0159 titled "High Temperature Indirect-Fired Furnace Development-Phase I, Final Report Nov., 1986-Apr. 1988" dated Oct. 7, 1988: Excerpb, pp. i, iii 1-3, 5, 9, 16-19, 26-29, 33, 52-55, 67, 68; App 2: 2-10; 2-31-84; 3-1-9.
Metals Handbook, 9th Edition, vol. 4, Heat Treating; pp. 307-309, 312; 365-366.
Metallurgia and Metal Forming, Dec. 1972-Jan. 1973; "Control of Carburizing Furnace Atmospheres Using Oxygen Potential Measurements" pp. 413-416; 19-23.
G. Hart, "Standard Free Energy of Formation of Oxides as a Function of Temperature" from F. D. Richardson c/o T. H. E. Jeffies., T. Iron Steel Inst., 160, 261 (1948).
Gas Research Institute
Nawalanic Frank J.
Wyszomierski George
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