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Steel Making

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

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

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

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

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

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

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

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

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

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

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

Manganese
Manganese adds considerably to the tensile strength of steel,...

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

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

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

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

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

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



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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