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Air-hardening Steels
These steels are recommended for boring, turning and planing...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Nickel-chromium
A combination of the characteristics of nickel and the charac...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

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

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

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

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

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...

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

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

Nickel
Nickel may be considered as the toughest among the non-rare a...

Impact Tests
Impact tests are of considerable importance as an indication ...

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

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

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



Properties Of Steel






Category: COMPOSITION AND PROPERTIES OF STEEL

Steels are known by certain tests. Early tests were more or less
crude, and depended upon the ability of the workman to judge the
grain exhibited by a freshly broken piece of steel. The cold-bend
test was also very useful--a small bar was bent flat upon itself,
and the stretched fibers examined for any sign of break. Harder
stiff steels were supported at the ends and the amount of central
load they would support before fracture, or the amount of permanent
set they would acquire at a given load noted. Files were also used
to test the hardness of very hard steel.

These tests are still used to a considerable extent, especially in
works where the progress of an operation can be kept under close
watch in this way, the product being periodically examined by more
precise methods. The chief furnace-man, or melter, in a steel
plant, judges the course of the refining process by casting small
test ingots from time to time, breaking them and examining the
fracture. Cutlery manufacturers use the bend test to judge the
temper of blades. File testing of case-hardened parts is very common.

However there is need of standardized methods which depend less
upon the individual skill of the operator, and which will yield
results comparable to others made by different men at different
places and on different steels. Hence has grown up the art of testing
materials.





Next: Tensile Properties

Previous: Alloying Elements



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