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Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

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

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

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

Impact Tests
Impact tests are of considerable importance as an indication ...

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

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

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

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Chromium
Chromium when alloyed with steel, has the characteristic func...

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

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

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

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

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

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...



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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