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Steel Making

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

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

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

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

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

Machineability
Reheating for machine ability was done at 100 deg. less than ...

Nickel
Nickel may be considered as the toughest among the non-rare a...

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

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

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

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

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

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

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

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

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

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

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



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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