Informational Site NetworkInformational Site Network
   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

The crankshaft was the most highly stressed part of the entir...

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

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

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

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

The Influence Of Size
The size of the piece influences the physical properties obta...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

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

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

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

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

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

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

Short Method Of Treatment


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

Add to Add to Reddit Add to Digg Add to Add to Google Add to Twitter Add to Stumble Upon
Add to Informational Site Network

Viewed 2963