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Steel Making

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

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

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

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

The Electric Process
The fourth method of manufacturing steel is by the electric f...

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

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

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

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

The Modern Hardening Room
A hardening room of today means a very different place from ...

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

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

The Influence Of Size
The size of the piece influences the physical properties obta...

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

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

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



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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