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Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

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

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

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

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

Hardness Testing
The word hardness is used to express various properties of me...

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

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

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

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

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

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

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



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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