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The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

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

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

High Speed Steel
For centuries the secret art of making tool steel was handed ...

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

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

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

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

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

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

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



Preparing Parts For Local Case-hardening






Category: CASE-HARDENING OR SURFACE-CARBURIZING

At the works of the Dayton Engineering Laboratories Company, Dayton,
Ohio, they have a large quantity of small shafts, Fig. 40, that
are to be case-hardened at A while the ends B and C are to
be left soft. Formerly, the part A was brush-coated with melted
paraffin but, as there were many shafts, this was tedious and great
care was necessary to avoid getting paraffin where it was not wanted.



To insure uniform coating the device shown in Fig. 41 was made.
Melted paraffin is poured in the well A and kept liquid by setting
the device on a hot plate, the paraffin being kept high enough
to touch the bottoms of the rollers. The shaft to be coated is
laid between the rollers with one end against the gage B, when
a turn or two of the crank C will cause it to be evenly coated.





Next: The Penetration Of Carbon

Previous: Preventing Carburizing By Copper-plating



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