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Care In Annealing
Not only will benefits in machining be found by careful anne...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

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

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

Hardening
The forgings can be hardened by cooling in still air or quen...

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

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

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

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

Gears
The material used for all gears on the Liberty engine was sel...

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

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

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

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

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

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

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

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



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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