US2224448A - Wear resisting alloy - Google Patents

Description

Patented Dec. 10, 1940 UNITED STATES 2,224,448 WEAR. RESISTING ALLOY Robert W. Schlumpf, Houston, Tex., assignor to Hughes Tool Company,

ration of Delaware Houston, Tex., a corpo- No Drawing. Application May 25, 1940,

Serial No. 337,249

4 Claims.

This invention relates to wear resisting metallic alloys adapted for use as a hard facing material or in the casting of small objects such as nozzles for sand blasting devices or for well drill nozzles, or similar articles.

It is an object to produce a. hard alloy of comparatively low melting point and adapted to be fused in position at temperatures below the fusing point of the objects to be hard faced. It is also desired to provide a hard compound which may be applied in position upon a device by a casting operation in a furnace.

The general objectvof the invention is to provide a ferrous alloy hich is of greathardness and also which fuses at temperatures below the melting point of ordinary steel, preferably within the range of 2000 to 2300 F.

In forming this alloy I employ with the iron, a small proportion of ingredients such as carbon, manganese and silicon which are desirable in producing a good quality of steel. To these elements, I add frohi3Vz% to 6 each ofchromium, molybdenum, and tungsten. To obtain a low fusing point, I also add a small pro- 5 portion from 1% to 2% of boron. Y

The proportions of the different elements may be varied within limits and I find that good results are obtained within the proportions indi cated in the following table:

Per cent Carbon 1.00 to 3.50 Manganese 0.50 to 2.00 Silic j 0.50 to 2.00,

. Chromium 3.50 to 6.50

Molybdenum 3i50to 6.50 Tungsten--- e 3.50 to 6.50 Boron V 1.00 to 2.00

' Iron Balance This compound fuses at comparatively low temperatures ranging from 2000 to 2300 F. and

' may be readily cast in position upon an object such as a bearing, a cutter, or the like.

The object to be hard faced may be placed in a mold, pieces of my alloy are then placed in the mold and the object and mold placed in a fur- ,is to be understood that 2300 ,5. comprising elements nace and heated to a temperature above 2000 F. to melt the alloy so that it will run down about the object to be hard faced. This operation is preferably performed in a non-oxidizing atmosphere. The mold is then cooled and the opera- 5 tion is completed except for such subsequent machining as may be desired.

While the method described is preferable it the alloy may be apwell known in the art 10 limited to the method plied by other methods and the invention is not of application described.

What I claim as new is: r 1. A hard alloy melting between 2000 and fused together in. 15 approximately the following proportions:

Per cent Carbo 1.00 to 3.50 Manganese 0.50 to 2.00 smm 0.150 to 2.00 Molybdenumu 3.50 to 6.50 Tungsten 3.50 to 6.50 Chromium 3.50 to 6.50 Boron 1.00 to 2.00 25 Iron Balance to make 100 2. A hard metal alloy melting below the pointof steel comprising from 0.50% to 2.00% each of silicon and manganese; approximately 2% each 'of carbon and boron, and approximately 30 l 5% of each of molybdenum, tungsten and chromium and iron to make up 100% in all.

3. A hard metal alloy of comparatively low melting point, consisting of not in excess of 3.50% carbon; manganese and silicon approxi- 35 mately 1% of each; molybdenum, tungsten and chromium approximately 5% each; boron from 1 to 2%, and about iron.

4. A hard metal alloy consisting of about 2% of carbon; approximately 5% each of molyb- 40 denum, tungsten and chromium; 1% to 2% of boron, about 1% each of manganese and silicon and about 80% iron.

ROBERT W. SCHLUMPF.