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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

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

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

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

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

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

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

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

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

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

Annealing
There is no mystery or secret about the proper annealing of d...

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

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

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

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

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

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

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

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



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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