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

Steel Making

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

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

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

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

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

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

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

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

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

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

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

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

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

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

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

Care In Annealing
Not only will benefits in machining be found by careful anne...



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



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 4146