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Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

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

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

Hardening
The forgings can be hardened by cooling in still air or quen...

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

Furnace Data
In order to give definite information concerning furnaces, fu...

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

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

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

Annealing Work
With the exception of several of the higher types of alloy s...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

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

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

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

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...



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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