79. If two persons, while walking, divide so as to pass an obstruction one on one side and one on the other, they will quarrel. Children avert this catastrophe by exclaiming, bread and butter, which is a counter charm. On the other hand, if the... Read more of Friendship at Superstitions.caInformational Site Network Informational
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Steel Making

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

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

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

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

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

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

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

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

Critical Points
One of the most important means of investigating the properti...

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

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

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

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

Conclusions
Martien was probably never a serious contender for the honor ...

Annealing
ANNEALING can be done by heating to temperatures ranging from...

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

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

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

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...



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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