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A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

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

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

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

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

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

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

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

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

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

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

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

The Forging Of Steel
So much depends upon the forging of steel that this operation...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

SULPHUR is another element (symbol S) which is always found i...

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

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Carbon Steels For Different 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:

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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