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Steel Making

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

Alloying Elements
Commercial steels of even the simplest types are therefore p...

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

Nickel
Nickel may be considered as the toughest among the non-rare a...

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

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

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

Drop Forging Dies
The kind of steel used in the die of course influences the he...

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

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

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

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...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Gears
The material used for all gears on the Liberty engine was sel...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

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

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

The Influence Of Size
The size of the piece influences the physical properties obta...

The Electric Process
The fourth method of manufacturing steel is by the electric f...



Heat Treatment Of Punches And Dies Shears Taps Etc






Category: HIGH-SPEED STEEL

HEATING.--The degree to which tools of the above classes should
be heated depends upon the shape, size and use for which they are
intended. Generally, they should not be heated to quite as high a
heat as lathe tools or milling cutters. They should have a high
heat, but not enough to make the flux run on the steel (by pyrometer
1,900 to 2,100 deg.F.).

COOLING.--Depending on the tools, some should be dipped in oil
all over, some only part way, and others allowed to cool down in
the air naturally, or under air blast. In cooling, the toughness
is retained by allowing some parts to cool slowly and quenching
parts that should be hard.

DRAWING THE TEMPER.--As in cooling, some parts of these tools will
require more drawing than others, but, on the whole, they must
be drawn more than water hardening tools for the same purpose or
to about 500 deg.F. all over, so that a good file will just touch
the cutting or working parts.

BARIUM CHLORIDE PROCESS.--This is a process developed for treating
certain classes of tools, such as taps, forming tools, etc. It is
being successfully used in many large plants. Briefly the treatment
is as follows:

In this treatment the tools are first preheated to a red heat,
but small tools may be immersed without preheating. The barium
chloride bath is kept at a temperature of from 2,000 to 2,100 deg.F.,
and tools are held in it long enough to reach the same temperature.
They are then dipped in oil. The barium chloride which adheres
to the tools is brushed off, leaving the tools as dean as before
heating.





Next: A Chromium-cobalt Steel

Previous: Heat Treatment Of Milling Cutters Drills Reamers Etc



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