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

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

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

Hardening
The forgings can be hardened by cooling in still air or quen...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

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

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

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

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

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

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

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

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

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

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

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...



Testing And Inspection Of Heat Treatment






Category: HEAT TREATMENT OF STEEL

The hard parts of the
gear must be so hard that a new mill file does not bite in the
least. Having passed this file test at several points, the gears go
to the center-punch test. The inspector is equipped with a wooden
trough secured to the top of the bench to support the gear, a number
of center punches (made of 3/4-in. hex-steel having points sharpened
to an angle of 120 deg.) and a hammer weighing about 4 oz. With
these simple tools, supplemented by his skill, the inspector can
feel the depth and quality of the case and the condition of the
core. The gears are each tested in this way at several points on
the teeth and elsewhere, the scrap gear being also subjected to
the test. Finally, the scrap gear is securely clamped in the
straightening press shown in Fig. 57. With a 3-1/2-lb. hammer and
a suitable hollow-ended drift manipulated by one of Sandow's
understudies, teeth are broken out of the scrap gear at various
points. These give a record confirming the center-punch tests,
which, if the angle of the center punch is kept at 120 deg. and
the weight of the hammer and blow are uniform, is very accurate.

After passing the center-punch test the ends of the teeth are peened
lightly with a hammer. If they are too hard, small particles fly
off. Such gears are drawn in oil at a temperature of from 300 to
350 deg.F., depending on their hardness. Some builders prefer to have
the extreme outer ends of the teeth drawn somewhat lower than the
rest. This drawing is done on gas-heated red-hot plates, as shown
at A in Fig. 58.



Nickel steel, in addition to all the tests given to carbon steel,
is subjected to a Brinell test. For each steel, the temperature
and the period of treatment are specific. For some unknown reason,
apparently like material with like treatment will, in isolated
cases, not produce like results. It then remains for the treatment
to be repeated or modified, but the results obtained during inspection
form a valuable aid to the metallurgist in determining further
treatment.





Next: Temperature Recording And Regulation

Previous: Affinity Of Nickel Steel For Carbon



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