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Steel Making

The Influence Of Size
The size of the piece influences the physical properties obta...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

Furnace Data
In order to give definite information concerning furnaces, fu...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

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

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

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

Alloying Elements
Commercial steels of even the simplest types are therefore p...

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

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

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

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

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

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

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

Chromium
Chromium when alloyed with steel, has the characteristic func...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...



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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