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Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

The Modern Hardening Room
A hardening room of today means a very different place from ...

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

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

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

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

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

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

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

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

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

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

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

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...



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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