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Steel Making

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

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

Impact Tests
Impact tests are of considerable importance as an indication ...

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

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

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

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

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Silicon prevents, to a large extent, defects such as gas bubb...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

The crankshaft was the most highly stressed part of the entir...

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

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

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

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

Heat Treatment Of Milling Cutters Drills Reamers Etc


THE FIRE.--Gas and electric furnaces designed for high heats are
now made for treating high-speed steels. We recommend them for
treating all kinds of Blue Chip tools and particularly the above
class. After tools reach a yellow heat in the forge fire they must
not be allowed to touch the fuel or come in contact with the blast
or surrounding air.

HEATING.--Tools of this kind should be heated to a mellow white
heat, or as hot as possible without injuring the cutting edges
(2,000 to 2,200 deg.F.). For most work the higher the heat the better
the tool. Where furnaces are used, we recommend preheating the
tools to a red heat in one furnace before putting them in a white
hot furnace.

COOLING.--We recommend quenching all of the above tools in oil
when taken from the fire. We have found fish oil, cottonseed oil,
Houghton's No. 2 soluble oil and linseed oil satisfactory. The
high heat is the important thing in hardening Blue Chip tools.
If a white hot tool is allowed to cool in the open air it will be
hard, but the air scales the tool.

DRAWING THE TEMPER.--Tools of this class should be drawn considerably
more than water-hardening steel for the same purpose.

Next: Heat Treatment Of Punches And Dies Shears Taps Etc

Previous: Heat Treatment Of Lathe Planer And Similar Tools

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