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

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Quenching
It is considered good practice to quench alloy steels from th...

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

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

Alloying Elements
Commercial steels of even the simplest types are therefore p...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

The Electric Process
The fourth method of manufacturing steel is by the electric f...

Nickel-chromium
A combination of the characteristics of nickel and the charac...

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

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

Sulphur
SULPHUR is another element (symbol S) which is always found i...

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

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

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...



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.





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