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Steel Making

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

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

Annealing Method
Forgings which are too hard to machine are put in pots with ...

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

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

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

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

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

Chromium
Chromium when alloyed with steel, has the characteristic func...

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

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...



The Effect






Category: HEAT TREATMENT OF STEEL

The heating at 1,600 deg.F. gives the first heat treatment
which refines the core, which under the former high heat (1,700 deg.F.)
was rendered coarsely crystalline. All the gears, including the
scrap gears, are quenched direct from the pot in this manner.

The gears then go to the reheating furnaces, situated in front of
a battery of Gleason quenching machines. These furnaces accommodate
from 12 to 16 crown gears. The carbon-steel gears are heated in a
reducing atmosphere to about 1,425 deg.F. (depending on the carbon
content) placed in the dies in the Gleason quenching machine, and
quenched between dies in mineral oil at less than 100 deg.F. The test
gear receives exactly the same treatment as the others and is then
broken, giving a record of the condition of both case and core.





Next: Affinity Of Nickel Steel For Carbon

Previous: Short Method Of Treatment



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