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Steel Making

Hardness Testing
The word hardness is used to express various properties of me...

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

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

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

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

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

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

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

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

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

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

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

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

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Heating
Although it is possible to work steels cold, to an extent de...

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

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

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



Lathe And Planer Tools






Category: HIGH-SPEED STEEL

FORGING.--Gently warm the steel to remove any chill, is particularly
desirable in the winter, then heat slowly and carefully to a scaling
heat, that is a lemon heat (1,800 to 2,000 deg.F.), and forge uniformly.
Reheat the tool for further forging directly the steel begins to
stiffen under the hammer. Under no circumstances forge the steel
when the temperature falls below a dark lemon to an orange color
about 1,700 deg.F. Reheat as often as is necessary to finish forging
the tool to shape. Allow the tool to cool after forging by burying
the tool in dry ashes or lime. Do not place on the damp ground
or in a draught of air.

The heating for forging should be done preferably in a pipe or
muffle furnace but if this is not convenient use a good clean fire
with plenty of fuel between the blast pipe and the tool. Never
allow the tool to soak after the desired forging heat has been
reached. Do not heat the tool further back than is necessary to
shape the tool, but give the tool sufficient heat. See that the
back of the tool is flatly dressed to provide proper support under
the nose of the tool.

HARDENING HIGH-SPEED STEEL.--Slowly reheat the cutting edge of
the tool to a cherry red, 1,400 deg.F., then force the blast so as
to raise the temperature quickly to a full white heat, 2,200 to
2,250 deg.F., that is, until the tool starts to sweat at the cutting
face. Cool the point of the tool in a dry air blast or preferably
in oil, further cool in oil keeping the tool moving until the tool
has become black hot.

To remove hardening strains reheat the tool to from 500 to 1,100 deg.F.
Cool in oil or atmosphere. This second heat treatment adds to the
toughness of the tool and therefore to its life.

GRINDING TOOLS.--Grind tools to remove all scale. Use a quick-cutting,
dry, abrasive wheel. If using a wet wheel, be sure to use plenty
of water. Do not under any circumstances force the tool against
the wheel so as to draw the color, as this is likely to set up
checks on the surface of the tool to its detriment.





Next: For Milling Cutters And Formed Tools

Previous: Cutting-off Steel From Bar



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