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Steel Making

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

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

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

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

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

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

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

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

Gears
The material used for all gears on the Liberty engine was sel...

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

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

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

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

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

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...



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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