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

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

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

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

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

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

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

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

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

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

Care In Annealing
Not only will benefits in machining be found by careful anne...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

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

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

Furnace Data
In order to give definite information concerning furnaces, fu...

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

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...



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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