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Steel Making

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

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

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

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

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Manganese
Manganese adds considerably to the tensile strength of steel,...

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

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

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

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

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

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

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



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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