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Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

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

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

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

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

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

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...

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

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

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

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

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

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

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...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

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



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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