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Steel Making

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Annealing
ANNEALING can be done by heating to temperatures ranging from...

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

Gears
The material used for all gears on the Liberty engine was sel...

Compensating Leads
By the use of compensating leads, formed of the same materia...

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

Drop Forging Dies
The kind of steel used in the die of course influences the he...

The Thermo-couple
With the application of the thermo-couple, the measurement of...

Critical Points
One of the most important means of investigating the properti...



Heat Treatment Of Milling Cutters Drills Reamers Etc






Category: HIGH-SPEED STEEL

THE FIRE.--Gas and electric furnaces designed for high heats are
now made for treating high-speed steels. We recommend them for
treating all kinds of Blue Chip tools and particularly the above
class. After tools reach a yellow heat in the forge fire they must
not be allowed to touch the fuel or come in contact with the blast
or surrounding air.

HEATING.--Tools of this kind should be heated to a mellow white
heat, or as hot as possible without injuring the cutting edges
(2,000 to 2,200 deg.F.). For most work the higher the heat the better
the tool. Where furnaces are used, we recommend preheating the
tools to a red heat in one furnace before putting them in a white
hot furnace.

COOLING.--We recommend quenching all of the above tools in oil
when taken from the fire. We have found fish oil, cottonseed oil,
Houghton's No. 2 soluble oil and linseed oil satisfactory. The
high heat is the important thing in hardening Blue Chip tools.
If a white hot tool is allowed to cool in the open air it will be
hard, but the air scales the tool.

DRAWING THE TEMPER.--Tools of this class should be drawn considerably
more than water-hardening steel for the same purpose.





Next: Heat Treatment Of Punches And Dies Shears Taps Etc

Previous: Heat Treatment Of Lathe Planer And Similar Tools



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