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Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

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

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

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

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

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

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

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

The Influence Of Size
The size of the piece influences the physical properties obta...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

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

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Impact Tests
Impact tests are of considerable importance as an indication ...

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

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



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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