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Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

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

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

Drop Forging Dies
The kind of steel used in the die of course influences the he...

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

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

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

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

The Electric Process
The fourth method of manufacturing steel is by the electric f...

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...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

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

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...



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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