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

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

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

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

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

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

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

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

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

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

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

Silicon
SILICON is a very widespread element (symbol Si), being an es...

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

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



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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