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Steel Making

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

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

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

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

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

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

Compensating Leads
By the use of compensating leads, formed of the same materia...

Hardening
The forgings can be hardened by cooling in still air or quen...

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

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

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

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

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

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

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...



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.





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Previous: Flange Shields For Furnaces



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