US1727282A

US1727282A - Alloy steel

Info

Publication number: US1727282A
Application number: US263974A
Authority: US
Inventors: James P Gill
Original assignee: VANADIUM ALLOY STEEL Co
Current assignee: VANADIUM ALLOY STEEL Co
Priority date: 1928-03-22
Filing date: 1928-03-22
Publication date: 1929-09-03
Anticipated expiration: 1946-09-03

Description

v No Drawing.

Patented Sept. 3, 1929 UNITED STATES.

JAMES P. GILL, 0F LATROBE, PENNSYLVANIA, ASSIGNOR TO VANAJJIUM ALLOY STEEL PATENT crude.

COMPANY, or L 'rnoBn' PENNSYLVANIA, A GORPQRATION on PENNSYLVANIA.

ALLOY STEEL. Y i

bon high-chromium type including as ingredients cobalt and vanadium.

Both of these ingredients have been hitherto employed as ingredients of alloy steel but not in the manner hereinafter described orin combination with each other.

Thus cobalt has been used as an ingredient in tungsten and molybdenum high-speed steels to increase the cutting efiiciency of the latter, and cobalt has also been added to high-carbon high-chromium steels in a proportion of more than 1%, usually about 3.50% toproduce red-hard proper.t1es.

My present object, however, is not the production of red-hard tain the improved quallties above mentioned. Moreover vanadium has been employed as an ingredient in many types of high-speed and tool steels with results which are well understood but are not the same as those which I have in view in connection with the present invention. I

High-carbon high-chromium steels are recognized as superior materials for dies owingto their wearinghualities compared to other die-steels, but their use has hitherto been restricted owing to relative poor machinability.

I have discovered that the addition of cobalt and vanadium to such steels greatly in1-.

proves their ma'chinability due to the better distribution of the segregatewhich results.

n segregate, which I eflect, causes the steel to harden 1n a more uniform manner than could occur if the cobalt and vanadium were not present as ingredients.

Again I have discovered that by adding cobalt and vanadium as ingredientshigh carbon high-chromium steels will attain a 7 these objects I have invented an alloy steel ofthe high-can roperties, but to ob- Application filed march 22, 1928. Serial No. 263,974.- I

more intensive hardness than is possible in" the absence of such'ingredients. i g Moreover high-carbon high-chromium steels are by nature relatively non-deforming and non-warping during hardening, but,

owing tothe presence of the'chromium carbide segregates such steels will'deform and 00 warp to a limited degree during the hardening processes.

This tendency I am able to reduce to a minimum by the inclusion in the steels of cobalt and vanadium as ingredients. Their inclusion acts to break up the segregates and to distribute them more uniformly throughout the steel, thus causing an easier and-more complete solution of the chromium carbide when the steelis'heated to-above its critical range. A

My improved alloy steel which possesses the improved qualities above referred to contains in Weight substantially from .50% to 1% of cobalt; from 50% to 1.25% of vanadium;from'1.5% to 2.50% of carbon; from 8 to 18% of chromium, with the remainder of lIOIl together with whatever silicon, man- ;ganese, phosphorous and sulphur which is normally present in steels of this type.

These limits are approximate only and'a reasonable range of variation may be observed without materially impairing "the beneficial results inview; I

I have obtained particularly ood results 5 from an allo, steel co nprising rom 2% to 2.20% ofcar on; from 11% to 13% of chromium; from 150% to 1% of cobalt; from .7 5% to 1.25% of vanadium; 30% of silicon; .30% of manganese; .02% of sulphur; .02% of phosphorus, and the remainder of iron. I f

Animprovement of these. cobalt-vanadium high-carbon high-chromium steels .is obtained by the addition of small quantities, up

requisite is high resistance to abrasion.

a What Idesire to claim is I 1; An alloy steel for dies and the hke com- 2 I C v 1,727,282

prisingsubstantially from .50% to .99% of dium; .30% of silicon; 30% of manganese; cobalt; from .50% to 1.25% of. vanadium; 102% of sulphur; 02% of phosphorus, and 5 from 1.50% to 2.50% of carbon; from 8% to the remainder of iron. 18% of chromium, and the remainder of iron. 4. An alloy steel for dies and the like com- 6 2. An alloy steel for dies and the like comprising substantially 2.20% of'carbon; 12%

prising substantially from .50% to .99% of of chromium; 80% of cobalt; .80% of Vanacobalt; from 50% to 1.25% of vanadium; dium; 30% of silicon; 30% of manganese; 2 from 8% to 18% of chromium; from 1.50% 02% of sulphur; .02% of phosphorus, not to 2.50% of carbon; not more than 1% of more than 1% of semi-rare metal, and the 10 semi-rare metal, and the remainder of iron. remainder of iron.

3. An alloy steel for dies and the like corn- Signed at Latrobe, Pa, this 20th day of prising substantially 2.20% of carbon; 12% March, 1928. of chromium; .80% of cobalt; .80% of vana- JAMES P. GILL.

x 1 CERTIFICATE or. CORRECTION.

Patent No. 1,727,282. i 1 Cranted September 3, 1929, to

I JAMES P. GILL.

It is hereby certified that the name of the assignee in the above numbered patent was erroneously written and printed as "Vanadium Alloy Steel Com any",

whereas said name should have been written and printed as "Vanadium Alloys Steel Company", as shown by the records .of assignments in this office; and that the said Letters Patent should be read with this correction thereimthat the same may conform to the record of the case in the Patent Office. 4

Signed and sealedfthis 1st day of October, A. D. 1929.

. M. J. Moore,

(Seal) i Acting Commissioner of Patents.