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No. 1041 is a 1,400° F (760° C) inert atmosphere tempering furnace from Grieve, currently used for heat treating at the customer’s facility. Workspace dimensions of this oven measure 48” W x 72” D x 48” H. 120 KW are installed in nickel-chrome wire coils supported by a stainless steel frame, while a 9,600-cfm, heat-resistant alloy recirculating blower powered by a 15-hp motor provides vertical upward airflow.
This Grieve inert atmosphere tempering furnace has 7” thick insulated walls comprising 5” thick 2,300° F ceramic fiber blanket and 2” thick 1,900° F block insulation. Features include inner walls clad with 304 stainless steel, 304 stainless steel ductwork and a stainless steel subway grating hearth. Other features include ¼” plate steel exterior reinforced with structural steel, ½” steel face plate at doorway and an air-operated vertical lift door. Inert atmosphere construction includes continuously welded outer shell, high temperature door gasket, sealed heater terminal boxes, inert atmosphere inlet, inert atmosphere outlet, inert atmosphere flow meter and manual gas valve.
Controls on the No. 1041 include a digital indicating temperature controller, a manual reset excess temperature controller with separate contactors, recirculating blower airflow safety switch and a digital batch timer with alarm.
Related Glossary Terms
- face plate
face plate
Flat, round workholder with slots used to hold regular- or irregular-shaped stock. If stock is markedly asymmetrical, counterbalances may be needed to prevent vibration.
- tempering
tempering
1. In heat-treatment, reheating hardened steel or hardened cast iron to a given temperature below the eutectoid temperature to decrease hardness and increase toughness. The process also is sometimes applied to normalized steel. 2. In nonferrous alloys and in some ferrous alloys (steels that cannot be hardened by heat-treatment), the hardness and strength produced by mechanical or thermal treatment, or both, and characterized by a certain structure, mechanical properties or reduction in area during cold working.
