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The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

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

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

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

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

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

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

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

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

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

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

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

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

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

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

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



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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