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Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

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

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

Drop Forging Dies
The kind of steel used in the die of course influences the he...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

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

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

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

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

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

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

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

Hardness Testing
The word hardness is used to express various properties of me...

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

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

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...



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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