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

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

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

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

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

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

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

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

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

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

Phosphorus is one of the impurities in steel, and it has been...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

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

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

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

Pickling The Forgings


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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