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Steel Making

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

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

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

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Hardness Testing
The word hardness is used to express various properties of me...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

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

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

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

The Influence Of Size
The size of the piece influences the physical properties obta...

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

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

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

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

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

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

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

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...



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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