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Chromium
Chromium when alloyed with steel, has the characteristic func...

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

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

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

Hardening
The forgings can be hardened by cooling in still air or quen...

Compensating Leads
By the use of compensating leads, formed of the same materia...

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

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

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

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

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

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

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

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

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Sulphur
SULPHUR is another element (symbol S) which is always found i...



Heating Of Manganese Steel






Category: FURNACES

Another form of heat-treating furnace
is that which is used for the heating of manganese and other alloy
steels, which after having been brought to the proper heat are drawn
from the furnace into an immediate quenching tank. With manganese
steel in particular, the parts are so fragile and easily damaged
while hot that it is frequent practice to have a sloping platform
immediately in front of the furnace door down which the castings
may slide into a tank below the floor level. Such a furnace with
a quenching tank in front of its door is shown in Fig. 108.

These tanks are covered with plates while charging the furnace
and the cold castings are placed in a moderately cool furnace.
Since some of these steels must not be charged into a furnace where
the heat is extreme but should be brought up to their final heat
gradually, there is little discomfort during the charging process.
When quenching, however, from a temperature of 1,800 deg. to 1,900 deg.,
it is extremely unpleasant in front of the doors. The swinging
shield is here adapted to give protection for this work. As will
be noted it is hung a sufficient distance in front of the doors,
that it may not interfere with the castings as they come from the
furnace, and slide down into the tank.

To facilitate the work, and avoid the necessity of working with
the bars outside the edges of the shield, the slot-like hole is
cut in the center of the shield, and through this the bars or rakes
for dragging out the castings are easily inserted and manipulated.
The advantage of such a swinging shield is that it may be readily
moved from side to side, or forward and back as occasion requires.





Next: Furnace Data

Previous: Flange Shields For Furnaces



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