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

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

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

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

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

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

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

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

Double Annealing
Water annealing consists in heating the piece, allowing it to...

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

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

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

Hardening
The forgings can be hardened by cooling in still air or quen...

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

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

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

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



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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