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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

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

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

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

Air-hardening Steels
These steels are recommended for boring, turning and planing...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

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

High Speed Steel
For centuries the secret art of making tool steel was handed ...

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

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

Furnace Data
In order to give definite information concerning furnaces, fu...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

Hardening
Steel is hardened by quenching from above the upper critical....

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

Compensating Leads
By the use of compensating leads, formed of the same materia...

The Electric Process
The fourth method of manufacturing steel is by the electric f...



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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