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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

Connecting Rods
The material used for all connecting rods on the Liberty engi...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Hardness Testing
The word hardness is used to express various properties of me...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

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

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

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

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

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

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

Alloying Elements
Commercial steels of even the simplest types are therefore p...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

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

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...



Heat Treatment Of Axles






Category: APPLICATION OF LIBERTY ENGINE MATERIALS TO THE AUTOMOTIVE INDUSTRY

Parts of this general type should be heat-treated to show the following
minimum physical properties: Elastic limit, 115,000 lb. per square
inch; elongation in 2 in., 16 per cent; reduction of area, 50 per
cent; Brinell hardness, 277 to 321.

The heat treatment used to secure these physical properties consists
in quenching from a temperature of from 1,520 to 1,540 deg.F. in water
and tempering at a temperature of from 975 to 1,025 deg.F. Where the
axle shaft is a forging, and in the case of steering knuckles and
arms, this heat treatment should be preceded by normalizing the
forgings at a temperature of from 1,550 to 1,600 deg.F. It will be
noted that these physical properties correspond to those worked
out for an ideal aviation engine crankshaft. If parts of this type
are designed with proper sections, so that this range of physical
properties can be used, the part in question will give maximum
service.

One of the most important developments during the Liberty engine
program was the fact that it is not necessary to use a high-analysis
alloy steel to secure a finished part which will give proper service.
This fact should save the automotive industry millions of dollars
on future production.

If the proper authority be given the metallurgical engineer to
govern the handling of the steel from the time it is purchased
until it is assembled into finished product, mild-analysis steels
can be used and the quality of the finished product guaranteed.
It was only through the careful adherence to these fundamental
principles that it was possible to produce 20,000 Liberty engines,
which are considered to be the most highly stressed mechanism ever
produced, without the failure of a single engine from defective
material or heat treatment.





Next: Making Steel Balls

Previous: Composition Of Transmission-gear Steel



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