VIEW THE MOBILE VERSION of www.steelmaking.ca Informational Site Network Informational
Privacy
   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

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

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

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

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

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

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

Conclusions
Martien was probably never a serious contender for the honor ...

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

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

Drop Forging Dies
The kind of steel used in the die of course influences the he...

Heating
Although it is possible to work steels cold, to an extent de...

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

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

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

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

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

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

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Nickel-chromium
A combination of the characteristics of nickel and the charac...



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



Add to del.icio.us Add to Reddit Add to Digg Add to Del.icio.us Add to Google Add to Twitter Add to Stumble Upon
Add to Informational Site Network
Report
Privacy
SHAREADD TO EBOOK


Viewed 4025