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

Hardness Testing
The word hardness is used to express various properties of me...

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

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

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

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

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

Critical Points
One of the most important means of investigating the properti...

The Forging Of Steel
So much depends upon the forging of steel that this operation...

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

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

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

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

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

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

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

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

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

Annealing Work
With the exception of several of the higher types of alloy s...



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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