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Steel Making

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

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

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

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

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

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

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

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

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

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

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

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

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...



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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