US846979A - Steel alloy and its manufacture. - Google Patents

Description

JAMES oHUR'oHwA'RD, or NEW YORK,;N. Y.

STEEL'AFLOY AND ITS MANUFACTURE.

To all wit/2111 it may concern:

- Be it known that I, JAMES CHUROHWARD, a subject of the King of Great Britain, residing in the borough of Manhattanfin the city,

county, and State of New*Y-ork, have invented certain new and useful Improve-- ments in Steel Alloys and Their Manufacture,

. of which the following is a specification.

This invention relates to the-production of nickel-steel alloys; and it has for its object the production of a steel alloy containing titanium, which owing to the high melting- '5 so employed as to require them to resist high temperatures and great strains.

point of titanium and its relatively high retardation-point is especiall valuable for constructing gun-forglngs an other steel parts The following-named alloying metals are combined with the steel in the Varying proportions here given:

Steel, containing from .10 per cent. to .60

1 Nickel 1.00 to 5.0 parts Manganese .25 to .7 parts Titanium .1 J. .50 to 10.0 parts Followingis a good working proportion Steel, containing from .10 per cent. to..60per cent. ofCarbon- 95.00 parts Nickel 3.00 parts Manganese -.50 parts 1.50 parts Titanium tions if molten titanium were mixed with the molten steel direct .or-the' alloy of nickel and steel the great difference between the melting-points would cause the titanium to chill.

and segregate; but with a small percentage of manganese added this difficulty is overcome if the procedure be the proper one. With the proper employment of manganese the titanium be completely assimilated, so that a conglomerate molecule is formed in which no microscopic segregation of titanium is visible. In this formation of nickel-tita nium steel the employment of manganese is Specification of Letters Patent. Application filed December 14.1906, Serial No. 347.321.

l-atented March12, 1907. i

absolutely essential to prevent the chilling of the molten titanium when the steel comes in contact with it. The action of the manganese is both chemical and physical in its characteristics, for on the titanium comingin contact with it a new and independent actionwhich may be characterized as artificial boiling is set up in the molten mass, and'this prevents the chilling and segregating of the titanium in the same mannerthat open water is prevented from freezing in very cold weather by agitation or stirring. During the action. caused by'the presence of manganese, which forms an interchange between the molecules of iron and those of titanium, the chilling action of the less refracto more refractory metal is ehminated for the. time, and then before it can begin the chilling action the titanium will have been absorbed and assimilated by the molecules of the iron.

Without the intermediation in the alloy of become a part of the mass molecules, but would form minute segregated particles between the molecules, thereby adding nothin valuable to the characteristics or physica pro e rties of the alloy.

. I the metal manganese the titanium would not T e procedure'for making the alloy is as i 1 follows: The titanium is melted in a crucible at a temperature, say, of about 3,000 centigrade, and the steel and nickel are melted in another crucible and heated up to. a oint just below the point of volatilization 0 that metal having the lowest volatilizing-point. The manganese is now added. to the molten titanium; and while it is being-melted and incorporated with the latter, the molten nickelsteel alloy from the other crucible is gradually added by pouring it in, and the alloy formed may be poured or cast directly into the mold.

- Thenickel is employed to impart tough- I ness to the alloy.

Obviously the titanium may be melted at the same time "the nickel and steel are being melted, and the only object in pouring the nickel-steel into the crucible containing the titanium instead of the reverse is that the titanium has the lower specific gravity.

The producing of alloys by pouring molten metals from one crucible to another is not new and is not herein claimed. I

Having thus' described my invention, I claim Q 1. An alloy consisting of steel, nickel,

manganese and titanium, in substantially the metals may be raised to avoid volatilizathe proportions specified. I K tion. 1

2. The herein-described mode of producing In Witness whereof I have lrereunto signed a steel alloy containing titanium, which conmy name, this 13th day of December, 1906, 5 sists first rlneltjing tlitaniiilm, then melting in the presence of two subscribing Witnesses. I5

toget er stee an nic rel, t en mixing manv t ganese with the molten titanium, and then JAMES (JHUROHWVABD' adding to the molten titanium and man- WVitnesses:

anese the molten alloy of nickel and steel 1 H. G. How, 10 the latter being at as high a temperature as 1 WILLIAM J. FIRTH.