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Steel Making

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

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

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

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

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

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

Although it is possible to work steels cold, to an extent de...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

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

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Heat Treatment Of Milling Cutters Drills Reamers Etc


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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