US1560207A - Resistant-surface alloy of iron - Google Patents

Description

objects will be in part lent results, I include the Patented Nov. 3, 192,5, 1

UNITED STATES PATIENT OFFICE.

GEORGE E. CHARLS, or cannon, 01110, ASSIGNOR T0 unrrnn ALLQYSTEEI: conroniiwon, or cannon, o no, A conronnrron on NEW YORK.

IRESIS'JJAN'J.-SURIEA('JE ALLOY OF IRON.

No Drawing.

To all whbm it may concern:

Be it known that I, Gnoner. H. Grunts, a citizen of the United States, and a resident of Canton, Stark County, State of ,Ohio, have invented an Improvement in Re sistant-Surface Alloys of Iron, of which the following is aspecification.

This invention relates to iron alloys. One of the objects thereof is to provide a practical alloy of iron of such nature that its surface will be dependably resistant to seveie corroding or discoloring influences and will maintain its originalcharacter and appearance. Another object'is to provide an alloy in which the above advantages are attained without sacrifice of physical erties' or undue increase of cost.

obvious or in part pointed out hereinafter.

The invention accordingly consists inthe combinations of constituents and in the ideas and features herein illustrativelyc described, and the scope of the'application of which will be indicated in the appended claims,

As an illustrative embodiment of this invention which I have found to give excelllowing elenients in the following propo ions: chromium from 16.0% to 20.0%, and molybdenum from .05% to 12%. These are incorporated in an iron alloy, and it may be noted I that the term iron alloy: is broadly used to include compositions in which carbon may or may not be present according as it is or is not specified. I

It is also to be noted that the term re-. 'sistant-surfaceis used to denote a characteristic of the metal whereby it, throughout its entire mass, is adapted to presenta surface. which strongly resists any tendencies to discoloration, corrosion, or other alteration by heat orany' other agency.

The carbon is preferably kept low, by

which is meant, in thisconnection, 20% orunder. In fact, I have, found highly desirsible.

able results with a carbon range of from .03 0 to .07%.

Elements such phur, usuall iron and stee as phosphorous I and sulresent in all commercial s ould be kept aslow as pos There is preferably added an amount of Application filed April 14, 1924. Serial No. 706,567.

a scavenger and thus permit the remaining elements to coact to the best effect, and it is to be understood that this element, as Well added in such manner as to difluse unif0rmly throughout theinass of themetal.

The'ranges abovev set forth are by no means limiting, as very considerable de-- viations therefrom may be made 'and subas the others above set forth, is preferably stantial benefit of the. invent-ion retained.

Accordingly, in certain of the claims, ranges of the-constituent elements broader than the above preferred range are'specified by setting higher or lower limiting percentages. I I The element molybdenum, however, is preferably ,kept low, in fact its full effect in imattained below 35%, and a substantially smaller amount gives better results.

Alloys such as' that above described will be found to achieve the objects of this invention and theadvantages hereinabove noted all without special heat treatment. a As, variations might be made in the embodiment of my invention herein described without departure from it scope, it is to be understood that all mat' r herein is to be interpreted as illustrative andnotin a limiting' sense; I claim as my invention:

A resistant-surface alloy of iron containing as the principal elements, in combination with the iron, silicon from .50% to 6.0%, chromium from 3.0% to 30.0%, and molybdenum in an effective amount not ex- I ceeding '.35%.

I 2. A resistant-surface alloyof iron containing as the principal elements, in combl- Y parting aqresistant surface to the alloy is nation with the iron, silicon from .50% to 6.0%, chromium from 3.0% to 30.0%, mo lybdenum in an effective amount not exceeding 35%, and carbon inan effective amoun not exceeding 20%. i

' 3. A resistant-surface alloy of; iron containing as the principal elements, in combination withthe iron, chromium from 16.0% to 25.0%, silicon from 1.0% to 4.0%,. molybdenum in, an efl'ective amount not exceeding 35%, .and carbon in an eifective amount not exceeding 10%.

4. A resistant-surface alloy of iron containing as the rincipal elements, in combination with t e iron, molybdenum from .05% .to 20%, chromium from 3.0% to 25.0%, silicon from .50% to 5.0%, and carbon 1n an eifective amount not exceeding 20%.

5. A resistant-surface alloy of iron containing as the principal elements, in combination with the iron, chromium from 16.0%

-' to 25.0%, molybdenum from 05% to silicon from .50% to 5.0%, and carbon in an effective amount not exceeding .20%.

6. A resistant-surface alloy of iron containing as the principal elements, in combination with the iron, silicon from 1.3% to 4.0%, chromium from 3.0% to 25.0%, and molybdenum in an efi'ective amount not ex? ceeding 35%.

7. A resistant-surface alloyof iron containing as the principal elements, in combination with the iron, silicon from 1.3% to 4.0%, chromium from 3.0% to 25.0%, molybdenum in an effective amount not exceeding 35%, and carbon in an effective amount not exceeding .10%.

8. A resistant-surface alloy of iron containing as the principal elements, in combination With the iron, molybdenum from .05% to 20%, chromium from 16.0% to 25.0%, silicon from 1.0% to 4.0%, and carbon in an effective amount not exceeding 9. A. resistant-surface alloy of iron containing as the principal elements, in combination with the iron, molybdenum from .05% to 12%, chromium from 16.0% to 20.0%, silicon from 1.0% to 2.50%, and carbon from 03% to .07

10. A resistant-surface alloy of iron con taining as the principal elements, in combination with theiron, chromium from 3.0%

GEORGE H. CHARL S.