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Steel Making

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

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

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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

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

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

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

Hardening
The forgings can be hardened by cooling in still air or quen...

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

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

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Nickel
Nickel may be considered as the toughest among the non-rare a...

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

High Speed Steel
For centuries the secret art of making tool steel was handed ...

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

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...



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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