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Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

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

Annealing
There is no mystery or secret about the proper annealing of d...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

Critical Points
One of the most important means of investigating the properti...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

The Thermo-couple
With the application of the thermo-couple, the measurement of...

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

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

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

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

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

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

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

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

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...



Hints For Tool Steel Users






Category: HARDENING CARBON STEEL FOR TOOLS

Do not hesitate to ask for information from the maker as to the
best steel to use for a given purpose, mentioning in as much detail
as possible the use for which it is intended.

Do not heat the steel to a higher degree than that fixed in the
description of each class. Never heat the steel to more than a
cherry red without forging it or giving it a definite heat treatment.
Heating steel at even moderate temperature is liable to coarsen the
grain which can only be restored by forging or by heat treating.

Let the forging begin as soon as the steel is hot enough and never
let tool steel soak in the fire. Continue the hammering vigorously
and constantly, using lighter blows as it cools off, and stopping
when the heat becomes a very dull red or a faint brown.

Should welding be necessary care should be taken not to overheat
in order to make an easy weld. Keep it below the sparkling point
as this indicates that the steel is burnt.

Begin to forge as soon as the welds are put together, taking care
to use gentle strokes at first increasing them as the higher heat
falls, but not overdoing the hammering when the steel cools. The
hammering should be extended beyond the welding point and should
continue until the dull red or brown heat is reached.





Next: Preventing Cracks In Hardening

Previous: Knowing What Takes Place



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