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Steel Making

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

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

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

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

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

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

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

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

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

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

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

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

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



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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