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

Sulphur
SULPHUR is another element (symbol S) which is always found i...

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Gears
The material used for all gears on the Liberty engine was sel...

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

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

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

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

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

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

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

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

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Drop Forging Dies
The kind of steel used in the die of course influences the he...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

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

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

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

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...



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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