US1166342A - Alloy of iron. - Google Patents

Description

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HERBERT E. FIELD .AND FRED CLINTON TILTON DANIELS, F \VHEELING, WEST VIRGINIA.

ALLOY OF IRON.

. provements in Alloys of Iron, of which the following is a specification.

This invention relates to improvements in alloys of iron.

The iron alloy to which this invention relates is particularly intended to be cast in the form of chilled rolls and also sand rolls which are to .be usedfor hot and cold rolling or working of iron, steel and other metals.

, The object of thisinvention is to produce an iron alloy which will produce cast chilled rolls and sand rolls that possess an extremely hard surface and strong central portion whereby the chilled surface is so extremely hard that it cannot be machine finished, but must be finished with grinding machines,

- and in which the black central portion of the roll-is of a strong, tough nature, that I enables it to withstand mechanical shocks and strains without fracture, even when heated in the hot working of iron and steel.

I The surface hardnessof a rollmade from 30 1 in working hot iron and steel, and for the our alloy is not decreased by this heating cold rolling of iron, steel and metals, a. roll made from our alloy with this hard surface gives the rolled material an exceptionally bright smooth finished surface.

We have discovered that an alloy composed of sulfur, sil-icon, phosphorus, manganese, carbon and iron with an amount of manganese arranging from 1.500%. to 3.50% of the whole mixture, produces a new alloy having the characteristics herein mentioned. The proportions of the other ingredients of our new alloy may vary along with the variation of the proportion of manganese.

- The invention broadly stated relates to the proportion of manganese that is used in the alloy and we have discovered that within about the roportion of manganese herein set forth an a 10y is produced for casting, chilled Specification of Letters Patent.

Patented Dec. 20, 10015.

- 'Application filed October 17, 1914:. Serial No. 867,215.

and sand rolls which have the characteristics herein before mentioned.

As one illustration of our new alloy composltion and the proportions of the ingredients thereof is as follows:

Silicon 0.250% to 1.50% Sulfur 0.025% to 0.20% Phosphorus 0.010% to 1.00% Manganese 1.500% to 3.50% Carbon 1.500% to 3.50%

Iron approximately suflicient to make 100%.

Our new alloy may be made with or with out nickel and chromium in proportions of each up to 3.50%. When chromium is added, the percent. .of silicon must be raised somewhat to offset the chilling qualities of the chromium.

We are aware that nickel, sulfurand chromium, in varying quantities, have been used for the purpose of our present invention, and in which case an addition of manganese enough to .clean the metal, impart fluidity and prevent blowholes, up to 1%, butthis .composition is entirely different fromours.

We are also aware that an alloy has been made with high percentage of manganese as common practice at about 12% to 15% and carbon 1.25% to 1.50%, and with and without'nickel and chromium. This, however, produces what is known as manganese steel, and is an entirely difierent metallurgi'cal proposition, and entirely without our limits, and produces a diflerent metal.

When our alloy is cast into sand rolls for the hot rolling of iron and steel, where a strong, hard, close grained material is required, the carbon is lowered to about-2.00%. In our alloy the manganese prevents the precipitation of graphite, and gives the roll the close grained hardness, toughness and great wearing qualities. Preferably these rolls are annealed to bring out the greatest strength of the material.

In carrying out our invention, the ingredients are melted together in a reverberatory furnace, although melting them in another kind of furnace would not change the nature of the alloy. Allowance is, of

Sulfur 0.065% Silicon 0.50 Phosphorus 0.55 Manganese 2.25 Carbon 3.30

Iron approximately suflicient to make 100%.

Another variation of our formula, which we regard as within our invention is as follows:

Silicon a 0. 50 Sulfur 0.050% Phosphorus 0.050% Manganese 2.30 {/21 Carbon 2.00 37?,

Iron approximately sufficient to make 100%.

Another variation within our invention is as follows:

Silicon 0.70 Sulfur 0.100f/L- Phosphorus 0. 050% anganese 2.30 Carbon 3. 25 Nickel 1.10 Chromium 1.75

Iron approximately suflicient to make 100%.

Another formula which we regard as included within our invention is as follows:

Silicon 0.70 Sulfur 0.100% Phosphorus 0.065% Manganese 2.25 Carbon .1. 90 Nickel 1.15 Chromium 1.05

Iron approximately sufiicient to make 100%.

Still another formula which we regard as within our invention is as follows Silicon 0. 250% to 1. 50% Sulfur 0.025% to 0.20% Phosphorus 0. 010% to 1. 00% Manganese 1. 500% to 3. 50% Carbon 1. 50 to 3. 50% Nickel 0. 00 to 3. 50% Chroimum O. 00 to 3. 50%

We desire it to be understood that there may be slight variations in proportions of the ingredients composing the alloy from those herein set forth and still be within the scope of our generic invention so long as the alloy contains a proportion of manganese to contribute thereto its hardness, strength, toughness and shock resisting qualities. So far as we are aware, a castiron alloy has not heretofore been made and compounded with a proportion of manganese to cause the finished product to have a very marked hardness combined with strength, toughness and shock resisting qualities.

Having thus described our invention, what we claim and desire to secure by Letters Patcut is:

1. As a new composition of casting alloy, an iron alloy containing silicon, sulfur, phosphorus, carbon, iron in about the proportions herein specified, and manganese in about the proportions of 1%; to 23% of the total compound whereby a finished cast article is produced having hardness, strength, toughness and shock-resisting qualities.

2. As a new composition of casting alloy, an iron alloy containing silicon 0.250% to 1.50%; sulfur 0.025% to 0.20%; phosphorus 0.010% to 1.00%; manganese 1.500% to 3.50%; carbon 1.500% to 3.50%; and iron. approximately sufiicient to complete the 100%.

In testimony whereof we hereunto aflix our signatures in the presence of two witnesses.

HERBERT E. FIELD. FRED CLINTON I'll/TON DANIELE Witnesses:

R. R. S. CRAWFORD, A. P. Amno.