US1979737A

US1979737A - Molten metal sampling

Info

Publication number: US1979737A
Application number: US720850A
Authority: US
Inventors: Charles B Francis
Original assignee: Individual
Current assignee: Individual
Priority date: 1934-04-16
Filing date: 1934-04-16
Publication date: 1934-11-06
Anticipated expiration: 1951-11-06

Description

Patented New 5, "M34 .MQLTEN METAL SAR IPLWG Charles B. Francis, Pittsbnrgh, Pa.

Application April 16, 1934, Serial No. 729,85ll

'1 Claims.

, This invention relates to the sampling of mol-w ten metal, one of the objects being to obtain a sample from 'molten metal in a furnace so that the sample obtained is not oxidized by the atmos phere in the furnaceor otherwise. Gther objects may be inferred. 1

Referring to the accompanying drawing:

Figure 1 is a side view of a device constructed according to the present invention,

Figures 2 and 3 are respectively longitudinal and transverse cross-sections of the device.

Figures 4 and 5 are top views of parts of the device.

The drawing shows a sampling device including a cast-iron or steel mold 1 that is of sulficient weight as compared to its size to be capable of absorbing sufi'icient heat to solidify molten steel contained therein when it is itself completely immersed in a body of the molten metal. This mold is provided with 'a suitable handle 2 of such length that it may be used to immerse the mold in a body'oi. molten metal.

A light gage terneplate cover 3 is constructed for application to the entrance of the mold 1. This coveris illustrated as consisting of a main portion 3 of such'size and shape that its edge portions may be bent down over the sides of the mold 1, and fastening portions'3 which are of such length that they may be wrapped completely around'the mold and their ends bent together to fasten the cover as a whole in place.

When the device is to be used to obtain a sample of molten steel from an open-hearth furnace. the mold 1 should be made of such external size that it may be inserted through the wicket in the door of the furnace, while the handle 2 should be of suflicient length to permit immersion of the mold in the steel in the furnace.

. it is held immersed for a short time.

During the time the mold is immersed in the molten steel the cover 3melts and allows a sample of the steel to flow into the mold, which then quickly absorbs sufficientv heat from the sample to efiect its solidification. The mold is then withdrawn from the furnace by means of its handle 2. As the sample in the mold is exposed to the slag on the steel and to the atmosphere in that the mold 1 contains a deoxidizing metal wire the furnace only after it has solidified, there is no danger of the sample internally absorbing anything from the slag or oxygen from the atmosphere. Therefore, proper drilling to obtain a por- .ple taken fromthe furnace. Therefore, the de vice being disclosed is further characterized in v 4 in its bottom portion. A plate 5 of the same 'metal is forced into the mold so as to hold the wire 4 against displacement. This plate may be relatively thin and of such size that its forcible insertion into the mold will retain it in place. Since the inside of themold will ordinarily be slightly tapered, such procedure is quite easy. It is believed that best deoxidizing results are obtained by the use of aluminumwire, the plate 5 being'then also made of aluminum. It is ob vious that the steel which enters the mold after the cover 3 is melted away is thoroughly deoxi-' dized almost immediately, this'being necessary because the sample freezes rather rapidly.

Terneplate is used for the cover 3 because the lead and tin coating resists oxidation sufficiently to protect the cover against being burnt away while the mold is being slagged. Other coatings having a similar protective quality might also be used. 1 i 5 Although a specific example of the invention is disclosed in accordance with the patent statutes, its scope is not intended to be limited exactly thereto, except as defined by the following claims.

I claim: l. A device for sampling molten metal, includ- -ing a mold constructed to absorb suflicient heat to solidify moltenmetal therein while it is itself completely immersed in a body of the same and a cover for the entrance to said mold that is constructed to disintegrate shortly after being contacted by molten metal.

2. A device for sampling molten metal, ineluding a mold constructed to absorb sufilcient heat to solidify molten metal therein while it is itself completely immersed in a body of the same, a cover for the entrance to said mold that is constructed to disintegrate shortly after being contacted by molten metal, and means in said mold for retaining a deoxidizer therein.

.3. A device for sampling molten metal including a mold constructed to absorb sufficient heat to solidify molten metal therein while it is itself completely immersed in a body of the same, a cover for the entrance to said mold that is con- Cit structed to disintegrate shortly after being contacted by molten metal, deoxidizing metal wire in the bottom portion of said mold and a plate of said deoxidizing metal forced into said mold so as to hold'said wire against displacement.

4. A device for sampling molten metal, including a metal mold constructed to absorb suflicient heat to solidify molten metal therein while it is itself completely immersed in a body of the same, and a relatively thin metallic cover for the entrance to said mold that has a surface which resists oxidation sufllciently to protect the same.

5. A device for sampling molten steel, including a cast-iron or steel mold that is 01 sufiicient weight as compared to its size to be capable of absorbing sufllcient heat to solidify molten steel therein when it is itself completely immersed in the molten steel to be sampled, and a light weight terneplate cover constructed for application to the entrance to said mold.

6. A device for sampling molten steel, including a cast-ironsor steel mold that is oi. sufficient weight as compared to its size to be capable of absorbing sufllcient heat to solidify molten steel therein when it is itself completely immersed in the molten steel to be sampled, a light weight terneplate cover constructed Ionapplication to the entrance to said mold, a deoxidizing metal wire in the bottom portion of said mold and a plate of said deoxidizing metal forced into said mold so as to hold said wire against displacement.' 3

7. A method of obtaining a'subsurface sample from a body of molten metal, including covering the entrance to a container with a thin metal plate, immersing said container in said metal at the desired subsurface area and leaving it so immersed until said plate melts through, allowing molten metal to enter and become solidified by absorption of its heat by said container, and then raising said container from said metal and removing the solidified metal therein.

CHARLES B. FRANCIS.