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

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

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

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

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

Impact Tests
Impact tests are of considerable importance as an indication ...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

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

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

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

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

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

Connecting Rods
The material used for all connecting rods on the Liberty engi...

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

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Annealing
There is no mystery or secret about the proper annealing of d...



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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