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Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

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

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

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

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

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

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

Nickel-chromium
A combination of the characteristics of nickel and the charac...

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

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

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

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

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

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

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

The Modern Hardening Room
A hardening room of today means a very different place from ...

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

Impact Tests
Impact tests are of considerable importance as an indication ...



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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