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Steel Making

The Forging Of Steel
So much depends upon the forging of steel that this operation...

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

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

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

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

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

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

Crankshaft
The crankshaft was the most highly stressed part of the entir...

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

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

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

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

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

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

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...



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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