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

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

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

Annealing Work
With the exception of several of the higher types of alloy s...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

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

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

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

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

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

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

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

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



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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