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Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

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

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

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

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

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

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

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

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

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

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

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

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

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



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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