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Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

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

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

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

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

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

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

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

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

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

Quenching
It is considered good practice to quench alloy steels from th...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

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

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

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



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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