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Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

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

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

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

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

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

The Modern Hardening Room
A hardening room of today means a very different place from ...

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

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

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

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

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

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

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



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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