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Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

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

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

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

Furnace Data
In order to give definite information concerning furnaces, fu...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

Quenching
It is considered good practice to quench alloy steels from th...

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

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

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

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

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

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

The Thermo-couple
With the application of the thermo-couple, the measurement of...

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

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...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...



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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