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Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Annealing Work
With the exception of several of the higher types of alloy s...

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

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

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

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

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

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

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

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

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Annealing
There is no mystery or secret about the proper annealing of d...

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

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

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

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



Pickling The Forgings






Category: APPLICATION OF LIBERTY ENGINE MATERIALS TO THE AUTOMOTIVE INDUSTRY

The forgings were then pickled in a hot solution of either niter
cake or sulphuric acid and water at a temperature of 170 deg.F., and
using a solution of about 25 per cent. The solution was maintained
at a constant point by taking hydrometer readings two or three
times a day, maintaining a reading of about 1.175. Sixty forked or
one hundred single rods were placed in wooden racks and immersed
in a lead-lined vat 30 by 30 by 5 ft. long. The rack was lowered
or lifted by means of an air hoist and the rods were allowed to
stay in solution from 1/2 to 1 hr., depending on the amount of
scale. The rods were then swung and lowered in the rack into running
hot water until all trace of the acid was removed.

The rod was finally subjected to Brinell test. This shows whether
or not the rod has been heat-treated to the proper hardness. If
the rods did not read between 241 and 277, they were re-treated
until the proper hardness is obtained.





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Previous: Liberty Motor Connecting Rods



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