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For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

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

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

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

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

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

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

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

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

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

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

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

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

Manganese
Manganese adds considerably to the tensile strength of steel,...

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

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



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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