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Bessemer Process
The bessemer process consists of charging molten pig iron int...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

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

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Care In Annealing
Not only will benefits in machining be found by careful anne...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

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

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

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

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

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

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

Compensating Leads
By the use of compensating leads, formed of the same materia...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

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

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...



Carbon Steels For Different Tools






Category: HARDENING CARBON STEEL FOR TOOLS

All users of tool steels should carefully study the different qualities
of the steels they handle. Different uses requires different kinds of
steel for best results, and for the purpose of designating different
steels some makers have adopted the two terms temper, and quality,
to distinguish between them.

In this case temper refers to the amount of carbon which is combined
with the iron to make the metal into a steel. The quality means
the absence of phosphorous, sulphur and other impurities, these
depending on the ores and the methods of treatment.

Steel makers have various ways of designating carbon steels for
different purposes. Some of these systems involve the use of numbers,
that of the Latrobe Steel Company being given herewith. It will
be noted that the numbers are based on 20 points of carbon per
unit. The names given the different tempers are also of interest.
Other makers use different numbers.

The temper list follows:

LATROBE TEMPER LIST OF CARBON TOOL STEELS
No. 3 temper 0.60 to 0.69 per cent carbon
No. 3-1/2 temper 0.70 to 0.79 per cent carbon
No. 4 temper 0.80 to 0.89 per cent carbon
No. 4-1/2 temper 0.90 to 0.99 pet cent carbon
No. 5 temper 1.00 to 1.09 per cent carbon
No. 5-1/2 temper 1.10 to 1.19 per cent carbon
No. 6 temper 1.20 to 1.29 per cent carbon
No. 6-1/2 temper 1.30 to 1.39 per cent carbon
No. 7 temper 1.40 to 1.49 per cent carbon





Next: Uses Of The Various Tempers Of Carbon Tool Steel

Previous: Carbon In Tool Steel



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