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Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

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

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

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

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

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

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

High Speed Steel
For centuries the secret art of making tool steel was handed ...

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

Alloying Elements
Commercial steels of even the simplest types are therefore p...

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

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

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

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

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

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...



Non-shrinking Oil-hardening Steels






Category: ALLOYS AND THEIR EFFECT UPON STEEL

Certain steels have a very low rate of expansion and contraction
in hardening and are very desirable for test plugs, gages, punches
and dies, for milling cutters, taps, reamers, hard steel bushings
and similar work.

It is recommended that for forging these steels it be heated slowly
and uniformly to a bright red, but not in a direct flame or blast.
Harden at a dull red heat, about 1,300 deg.F. A clean coal or coke
fire, or a good muffle-gas furnace will give best results. Fish
oil is good for quenching although in some cases warm water will
give excellent results. The steel should be kept moving in the bath
until perfectly cold. Heated and cooled in this way the steel is
very tough, takes a good cutting edge and has very little expansion
or contraction which makes it desirable for long taps where the
accuracy of lead is important.

The composition of these steels is as follows:

Per cent
Manganese 1.40 to 1.60
Carbon 0.80 to 0.90
Vanadium 0.20 to 0.25





Next: Effect Of A Small Amount Of Copper In Medium-carbon Steel

Previous: Properties Of Alloy Steels



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