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Steel Making

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

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

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

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

SILICON is a very widespread element (symbol Si), being an es...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

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

Piston Pin
The piston pin on an aviation engine must possess maximum res...

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

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

Critical Points
One of the most important means of investigating the properti...

Steel is hardened by quenching from above the upper critical....

High Speed Steel
For centuries the secret art of making tool steel was handed ...

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

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

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

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

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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