US1337210A - High-speed tool-steel - Google Patents

Description

I the like.

152,725, filed UNITED STATES PATENT OFFICE.

WALTER LOTHAR EDUARD EILENDER, OF REMSCHEID, GERMANY, ASSIGNOR; BY MESNE ASSIGNMENTS, TO THE CHEMICAL FOUNDATION, INC., A CORPORATION OF DELAWARE.

HIGH-SPEED No Drawing. Application filed March 6,

To all whom it may concern.-

Be it known that I, WALTER LOTHAR EDU- ARD EILENDER, a subject of the German Emperor, and residing at Remscheid, Germany, have invented certain new and useful Improvements in High-Speed Tool-Steels, of which the following is a specification.

High speed steels are as a rule produced by alloying a carbon-steel of the desired hardness, which contains between 0.1 and 0.3 p. c. manganese and 0.1-0.3 p. c. silicon with 3 to 7 p. c. chromium and 18-25 p. c. tungsten. Such steels are called chromiumtungsten-steels.

It is known to alloy such steels with small quantities of vanadium, molybdenum and They then are called, for example, chromium-tungsten-molybdenum-steels.

If, as it is known, such steels arefurther alloyed with larger quantities of cobalt, they are called chromium-tun sten-cobalt-steels.

In my ap lications os. 152,724 and arch 6, 1917, are described, first a high speed steel in which the tungsten is replaced by molybdenum representin a chromium-molybdenum steel, and, secon a high speed steel which may be called a chromium -'molybdenum vanadium or a chromium-molybdenum-cobalt-steel.

Later experiments have proved, that it is possible to omit the addition of molybdenum, if the content of manganese is raised to about 2 p. c., that of chromium is increased some de ees and 1.0 to 5.0 .p. c. of cobalt are added? I then produce a chromium-cobalt-steel.

As in steels known till now, also in the new chromium-cobalt-steel the quantity of the different components may be varied Specification of Letters Patent.

1.0-2.0 p. 0. Mn p. c. Cr, 1.0-5.0 p. 0. Co.

TOOL-STEEL.

Patented Apr. 20, 1920. 1917. Serial No. 152,726.

within certain limits without causing the steel to become useless. limits less of one element sated by more of another.

The new chromium-cobalt-steel may be improved in its working capacity as a high speed steel, by an addition of 0.l52.0 p. c. vanadium. By doing so, I produce a chromium-cobalt-vanadium-steel.

A steel of the followin composition, 0.6 1.2 p. c. C, 1.0-2.0 p. c. n, 0.1-0.3 0. Si, 3.0l0.0 p. 0. Cr, 1.0-5.0 p. c. 00, found to be best suited as a high speed steel.

The steel may be produced by melting, in crucibles, bar steel containing the required amount of carbon, manganese, silicon, and also vanadium, if desired, and adding thereto the re uisite amount of the metals chromium an cobalt, viz., 3 to 10 per cent. chromlum, and 1 to 5 per cent. cobalt, and after proper fusion the fused metal is poured may be compenfrom the crucible into suitable ingot molds.

at I claim and desire to secure by Letters Patent as my invention is 1. The herein described high speed steel, containing besides iron also 0.6-1.2 p. c. O, 0.1-0.3 p. 0. Si, 3.0400

2. The herein described high speed steel contaming besides iron also 0.64.2 p. c. G, 1.0-2.0 p. c. Mn, 0.1-0.3 0. Si, 3.010.0 p. 0. Cr, 1.0-5.0 p. 0. Co an 0.152.0 p. 0 Va.

In testimony whereof I hereunto aifix my slgnature in the presence of two witnesses.

WALTER LOTHAR EDUARD EILENDER.

Witnesses: HELEN Norma, Fmons Nurse.-

Within certain i