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Steel Making

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

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

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

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

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

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

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

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

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

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

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

Silicon
SILICON is a very widespread element (symbol Si), being an es...

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

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

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

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

Machineability
Reheating for machine ability was done at 100 deg. less than ...



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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