US1570055A - Heat-treating container - Google Patents

Description

Patented Jan. 19, 1926.

UNITED STATES PATENT OFFICE.

` RUDQLP RILINTEBMANN, or DETROI'I, MICHIGAN, `assew ro meinen 'emm ces'rmes COMPANY, or hmmm MICHIGAN, A conrom ron or ienem` HEAT-TBEATING CON N B Application med May '5, 1924. serial No. 71,2"7o.

To all whom `it may concerm Be is known that I, RUDOLPH F. FLINTEb MANN, a citizen of theUnited States of America, residing at Detroit, in the County 5 of Wayne and 'State of Michigan, have invented certain 'new and useful Improvements in Heat-Treating Containers, g of which thefollowing is a specification, reference being had thei-ein to the accompanying drawings. v

The invention relates to heat treating containers and more particularly to a carbonizing box adapted for long service at high temperatures. e v

The object of the invention is to provide a container or box so designed that, when cast of heat resisting alloy metal, it will not warp or crack as a result of alternate exposure to high temperature and cooling to room temperature. Alloy metals, dependent on a major peroentage of chromium, nickel,

or silicon, for resistance to the oxidizing ef feet of high temperatures, fail most frequently by cracking or warping out of shape. 'This invention, by preventing or minimizing cracking and warping, prolongs the life of the container or box and reduces the cost per hour of service.

These and other objects have been accomplished in the present instance by using the Construction as hereinafter set forth.

In the drawings:-

Figure l is a perspective View of my improved heat treating container;

Figure 2 is a longitudinal section thereof on the line 2 2 of Figure 3;

Figure 3 is a horizontal section on the line 3-3 of Figure 3;

F igure 4 is a sectional elevation of a modified Construction;

Figure 5 is another modified Construction having corrugations on the bottom surface thereof.

My improved heat treating cuntainer is made by casting in sand molds an alloy which is of such composition that it resists `oxidation at elevatecl temperature. It has long been a matter of general knowledge that the heat resistance of iron can be increased by the addition of silicon, chromium, or nickel, either singly or' together. At the present time several alloys are being 'freedom 'from sharp corners dissipates the forces of expansion and contraction so that enough strain to produce a crack cannot be localized at one point. By elimination of cracking and warpage as a cause of failure,-

my improved design of heat treating container increases the life' and value of heat resisting alloys. r

The improved design provides side walls entirely free from sharp corners while they are rendered more rigid by stifl'ening corrugations. Thus, as shown in Figures 1 to 3, the container comprises the bottom wall 1 and the side walls 2 integrally cast therewith, the side Walls being for-med with a series of vertical corrugations 3 having smooth outcr and inner contours 'free from sharp corners. The side walls 2 are preferably of uniform thickness throughout the entire periphery of the container and are united with the bottom wall l by the rounding portions 4. The container is provided With the feet or supporting runners 5 integrally cast with the bottom wall, and as shown in F igure 2 these feet may be located at the corners of the box and extend diagonally inward therefrom. It will, of course, be understood that the feet or supporting runners may be placed at any other desired oints on the bottom of the box or container to fit a particular furnace design, 'or example, by having theni extend the entire length or width of the box.

In Figure 2 the corrugations are shown as terminating short of the bottom wall l and extending to the top surface of the container, while in F igure 4 the corrugations are extended to intersect with the bottom wall. Figure 5 shows still a further modification having the bottom surface 6 provided with longitudinal corrugations 7.

With each of these constructions the container is formed as an integral structure of a cast heat resistant alloy, and the side Walls have uninterrupted vertical corrugations entirely free from sharp corners where the stresses set up by the temperature changes might be localized to produce cracking or warping.

What I claim as my invention is 1. A heat treating container comprising a cast structure of a heart resisting alloy having integral bottom and side walls, the side walls being formed with uninterrupted vertical corrugations forming a wavy surface free from straight portions intermediate said corrugations, the entire surface of said container being free from sharp corners.

2. A heat treating container comprising a cast structure of a heat resisting alloy having integral side walls and a bottom wall orming a substantially rectangular structure open at the top, the side walls being formed with unnterrupted vertical corrugatons forming a wavy surface free from straight portions intermediate said corru ations.

3. cast heat treating container fol-med of a heat resisting alloy, said container comprising side walls and a bottom wall forming a substantially rectangular structure o en at the top, the side walls being forme( with uninterrupted vertical corrugations imparting to the walls a waivy surface free from straight portions intermediate said corrugations, feet de ending from said bottom wall, said verticai corrugations extending to the top of said eontainer.

'4. A hem: treatng container comprising a cast structure having integral bottom and side Walls, the side walls being forned with uninterruptcd vertical corrugations inparting a wvy' surface thercto free from straight portions, said structure being composecl of a sand east alloy containing iron and a substantial amount of chromium sufficient to render the container resistant to oxidation at elevated ten'peratures.

In testimony whereof I aifix my signature RUDOLPH F. FLINTERMANN.

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