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Steel Making

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

Sulphur
SULPHUR is another element (symbol S) which is always found i...

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

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

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

Machineability
Reheating for machine ability was done at 100 deg. less than ...

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

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

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

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

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

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Nickel
Nickel may be considered as the toughest among the non-rare a...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

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

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

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

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



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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