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Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

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

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

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

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

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

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

Critical Points
One of the most important means of investigating the properti...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

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

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

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

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

Impact Tests
Impact tests are of considerable importance as an indication ...

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



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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