US1535763A - Resistant-surface alloy of iron - Google Patents

Description

Patented Apr. 28, 1925.

UNITED STATES PATENT OFFICE.

GEORGE H. CHARLS, OF CANTON, OHIO, ASSIG'NOB: TO UNITED ALLOY STEEL 601 B I PORATION, OF CANTON, OHIOQA CORPORATION OF NEW RESISTANT-SUB-FACE ALLOY OF IRON.

No Drawing.

To all whom it may concern: I

Be it known that I, GEORGE H. CHARLS, a citizen of the United States, and a resident of Canton, Stark County, State of Ohio, 5 have invented an Improvement in Resistant- Surface Alloys of Iron, of which'the following is a specification.

This invention relates toalloys of iron. One of the objects thereof is to provide a practical iron alloy, the surface of which is thoroughly resistant under conditions of use to any agent tending'tocorrode or discolor it. Another object is to provide an alloy of the above nature of good physical properties. Another object is to provide an alloy of the above nature which will be inexpensive and suitable for-manufacture on a large scale. Other objects will be in part obvious and in part pointed out hereinafter.

The invention" accordingly consists in the combinations of elements and in the ideas hereinafter illustratively set forth, and the scope of the application of which, will be pointed out in the appended claims! Before considering the invention in detail, it may be noted that the term iron is used in a broad sense to comprehend not only pure iron but iron including carbon, the latter making what might be more specifically termed steel. It is also to be noted that the term resistant surface is intended to denote a characteristic b virtue of which the entire body of the al 0y is such that if its surface be exposed, such surface will resist any agency tending to alter its character, whether by corrosion, staining, heat or otherwise. 1

In the alloy embodying my invention I include chromium, molybdenum and copper.

40 A composition which I have found to give excellent results comprises copper from .40% to .60%, molybdenum from .05% to .12% and chromium from 16.0% to 20.0%.

The carbon is preferably kept low, by

which is meant in this connection 20% or less. An amount of carbon which has given very desirable results is from .03% to .07

It is to be understood th t none of the above ranges-are unnecessary to attain many of the advantages of my invention, as they may be considerably broadened. However,

- both the copper and. molybdenum arelpreferably to be used in small amounts, as small quantities of them are most efficacious in attaining the desired character of the sum Application filed April 14, 1924.. Serial No. 706,564.

face of the alloy. It may be noted that the conjoint use of copper and molybdenum is highly advantageous, as when used together they have an effect markedly superlor to that of either used without the other.

It is to be understood that in this alloy there. are usually present small amounts of phosphorous, sulphur, and other, elements commonly present in commercial iron and steel, but such elements are to be kept as low as possible. a

I also prefer to add vanadium in an amount ranging from .10% to .50% for best results in scavenging the metal.

The various elements are added preferably with the iron in molten form in such manner as to attain the various constituents throughout the mass of the alloy.

As the illustrative alloy above set forth' might be varied in many respects without departing from the scope of this invention, it is to be understood that all matters herein set forth are to be interpreted as illustrative and not in a limiting sense.

I claim as my invention 1. A resistant-surface alloy of iron comprising, in combinationwith the, iron, chromium from 3.0% to 30.0%, copper from .10% to 2.0%, and molybdenum from .05% to 35%. Y

2. A resistant-surface alloy of iron comprising, in combination with the ir0n, carbon in an amount not exceedlng 20%, chromium from 3.0% to 30.0%, copper from .10% to 2.0%, and molybdenumfrom .05% to 55%.

3. A resistant-surface alloy of iron comprising, in combination with the iron, carbon in an amount not exceeding 20%, copper from 15% to 2.00%, 'molybdenum from to 20%, and chromium from 3.0% to 25.0%.

4. A resistant-surface alloy of iron comprising, in combination with the iron, carbon in an amount not exceeding 20%, copper from .15% to 2.00%, molybdenum from .05% to 20%, and chromium from 16.0% to 25.0%. 5. A resistant-surface alloy of iron comprising, in combination with the iron, carbon in an amount not exceeding 10%, copper .from 15% to- 2.00%,molybdenum from 05% to 20%, and chromium from 3.0% to 25.0%.

6. A resistant-surface alloy of iron comprisingfin combinationwith' the iron, carbon in an amountnot exceeding .10%, copper from 20% to .75%,-mo1ybdenum from .05% to 20%, and chromium from 16.0%

7. A'resistant-surface alloy of iron comprising, 1n combinatlon with the iron, carbon in an amount not exceeding .10%, copper from 20% to .75%, molybdenum from .05% to 20%, and chromium from 16.0%

to 20.0%. 8. A resistant-surface alloy of iron comprising, in combination with the iron, carbon from .03% to .07 copper'from 20% to .75%, molybdenum from .05% to to .60%,:molybdenum from .05% to .12%, and chromium from 16.0% to 20.0%.

10. A resistant-surface alloy of iron comprising, in combination with the iron, chromium from- 3.0% to 30.0%, copper from 10% to 2.0%, molybdenum from 05% to .35%, and an appreciable amount of vanadium not to exceed .50%.

11. A resistant-surface alloy of iron c0mprising, in combination with the iron, chromium from 3.0% to 30.0%, copper from .10% to 2.0%, molybdenum from 05% to 35%, carbon in an amount not exceeding 20%, and an appreciable amount of vanadium not exceeding .50%.

' In testimony whereof, I have signed my name to this specification this third day of April, 1924.

GEORGE H. CHARLS.