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Steel Making

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

Hardening
Steel is hardened by quenching from above the upper critical....

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

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

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

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

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

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

Corrosion
This steel like any other steel when distorted by cold worki...

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

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

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

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

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

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

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

Chromium
Chromium when alloyed with steel, has the characteristic func...

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



Heat Treatment Of Milling Cutters Drills Reamers Etc






Category: HIGH-SPEED STEEL

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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