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Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

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

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

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Corrosion
This steel like any other steel when distorted by cold worki...

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

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

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

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

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

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

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

Manganese
Manganese adds considerably to the tensile strength of steel,...

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

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

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

Compensating Leads
By the use of compensating leads, formed of the same materia...



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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