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Refining The Grain
This is remedied by reheating the piece to a temperature slig...

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

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

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 ...

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

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

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

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

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

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

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

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

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

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

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Hardening
Steel is hardened by quenching from above the upper critical....

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...



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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