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Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

Manganese
Manganese adds considerably to the tensile strength of steel,...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

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

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

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

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

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

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Chromium
Chromium when alloyed with steel, has the characteristic func...



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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