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Steel Making

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

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

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Care In Annealing
Not only will benefits in machining be found by careful anne...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

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

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

Conclusions
Martien was probably never a serious contender for the honor ...

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

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

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

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

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

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

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



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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