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Steel Making

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

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

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

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

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

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

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

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Annealing
There is no mystery or secret about the proper annealing of d...

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

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

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Gears
The material used for all gears on the Liberty engine was sel...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

High Speed Steel
For centuries the secret art of making tool steel was handed ...

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

Annealing
ANNEALING can be done by heating to temperatures ranging from...

Impact Tests
Impact tests are of considerable importance as an indication ...



Short Method Of Treatment






Category: HEAT TREATMENT OF STEEL

In the new method, the packed pots are
run into the case-hardening furnaces, which are heated to 1,600 deg.F.
On the insertion of the cold pots, the temperature naturally falls.
The amount of this fall is dependent upon a number of variables,
but it averages nearly 500 deg.F. as shown in the pyrometer chart,
Fig. 61. The work and furnace must be brought to 1,600 deg.F. Within
2-1/2 hr.; otherwise, a longer time will be necessary to obtain
the desired depth of case. On this work, the depth of case required
is designated in thousandths, and on crown gears, the depth in
0.028 in. Having brought the work to a temperature of 1,600 deg.F.
the depth of case mentioned can be obtained in about 5-1/2 hr. by
maintaining this temperature.

As stated before, at the top of each pot are several test pieces
consisting of a whole scrap gear and several sections. After the
pots have been heated at 1,600 deg.F. for about 5-1/4 hr., they are
removed, and a scrap-section test-piece is quenched direct from
the pot in mineral oil at not more than 100 deg.F. The end of a tooth
of this is then ground and etched to ascertain the depth of case.
As these test pieces are of exactly the same cross-section as the
gears themselves, the carburizing action is similar. When the depth
of case has been found from the etched test pieces to be satisfactory,
the pots are removed. The iron ball then is dropped into the tube
to seal the hole in the bottom of the pot; the cover and the tube
are removed, and the gears quenched direct from the pot in mineral
oil, which is kept at a temperature not higher than 100 deg.F.





Next: The Effect

Previous: The Packing Department



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