US879517A - Process of hardening and tempering steel. - Google Patents

Description

State of Oregon,

steel the same is B ARNABAS J. OASTE-RLINE, OF PORTLAND, OREGON,

PATENT OFFICE.

ASSIGNOR TO CASTERLINE OUTLERY COMPANY, OF PORTLANROREGON, A CORPORATION.

- RocEss OF HARDENING AND TEMPERING STEEL.

Specification of Letters Patent;

Patented Feb. 18, 1908.

Application filed June 13 1907. Serial No. 378.728,

To alZ'whom it magi concern:

Be it known that I, BARNABAS J. CASTER- ILIN'EL, a citizen of the United States, and resident-of Portland, county ofMultnomah, and have invented certain new and useful Im rovements. in Processes of Hardening and i following 1s' a specifi c'ati on..

' This invention relates. to a process of bar- .dening and'tem ering steel especially such artic lescompose all edged-tools. {The objeots of the invention being to prevent crystallization;-to attain a maximum degree silvery-a pearance; to obviate the necessity ofildepen mg upon natural elements such as air and water, or upon quicksilver, sal ammonlac'and alum; to produce anot onlyexcessively hard, but exceedingly malleable product which has qualities of'resistance enabl ing. the same to be successfully employed as a, means steel or chromium steel; and to rovi'de articles of' the character named which embody elements of great durability. These objects are attained'in my improved v ploying. a solution of salt, saltpeter, wood alcohol, carbonate of iron, borax, glycerin and oil. I

To. temper and harden a given "article of first heated to a cherryred heat, then immersed into the above named solution-and kept submerged for the same length of time required to allow water to subside and discontinue bubbling when a piece-of cherry-red heated steel is submer edtherein; said period of time will be readll understood by those familiar-with the art 0 tempering metals. v After being allowed to-cool in the solution for a period as stated above the article is coated with tallow and then heated slowly by holding it over a slow fire, until drawn to the degree of mallea empering Steel, of which the of'steel as drills, blades and of hardness and a white,-

for cutting and drilling manganese process by emany perceptible manner heat, then submerging then coating the steel bility' required, the period of time being va ried according to the uses for which the article being tempered is intended.

In the operation and use of my invention sharp-edged knives tempered by the said process may be readily employed to alternately out chips from a steel bar and shave fine hair from the back of a human hand without perceptible dulling of the edge; drills so tempered may be employed for drilling holes through hard steel Without in impairing their cutting edges; edge tools of all character. are made very durable and maintained in perfect working shape for a maximum length of time, and elongated cutting blades such as swords may edges not susceptible of being dented or turned by contact with other blades, while at the same time the blade may embody the desirable degree ofresiliency.

Having'thus described my invention, what I claim as new, and desire to secure by Let'- ters Patent, is

The hereinbefore described improvement in tempering and hardening steel, consisting of first heating the steel to a cherry red and cooling the steel in a solution ofsalt, salt eter, carbonate of iron, borax, wood alcoho i, glycerin and oil;

jecting it to mg it over scribed.

. *In testimony that, I claim the foregoing as the same, substantially as demy invention, I have signed my name 1n resence of two Witnesses, this 24th day of lay 19.07;

BARNABAS J. OASTERLINE'.

Witnesses:

W. JUNrs,

FRANK Mo'r'rEn.

be provided with exceedingly keen,

-with tallow', and s11b the action of a slow fire by hold--