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

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

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

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

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

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

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

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

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

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

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

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

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

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



Impact Tests






Category: COMPOSITION AND PROPERTIES OF STEEL

Impact tests are of considerable importance as an indication of
how a metal will perform under shock. Some engineers think that
the tensile test, which is one made under slow loading, should
therefore be supplemented by another showing what will happen if
the load is applied almost instantaneously. This test, however, has
not been standardized, and depends to a considerable extent upon
the type of machine, but more especially the size of the specimen
and the way it is nicked. The machine is generally a swinging
heavy pendulum. It falls a certain height, strikes the sample at
the lowest point, and swings on past. The difference between the
downward and upward swing is a measure of the energy it took to
break the test piece.





Next: Fatigue Tests

Previous: Tensile Properties



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