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

Steel Making

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

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

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

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

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

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

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

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

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

The Electric Process
The fourth method of manufacturing steel is by the electric f...

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

Chromium
Chromium when alloyed with steel, has the characteristic func...

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

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

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



The Penetration Of Carbon






Category: CASE-HARDENING OR SURFACE-CARBURIZING

Carburized mild steel is used to a great extent in the manufacture
of automobile and other parts which are likely to be subjected to
rough usage. The strength and ability to withstand hard knocks
depend to a very considerable degree on the thoroughness with which
the carburizing process is conducted.

Many automobile manufacturers have at one time or another passed
through a period of unfortunate breakages, or have found that for
a certain period the parts turned out of their hardening shops
were not sufficiently hard to enable the rubbing surfaces to stand
up against the pressure to which they were subjected.

So many factors govern the success of hardening that often this
succession of bad work has been actually overcome without those
interested realizing what was the weak point in their system of
treatment. As the question is one that can create a bad reputation
for the product of any firm it is well to study the influential
factors minutely.





Next: Introduction Of Carbon

Previous: Preparing Parts For Local Case-hardening



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