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Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

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

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

Nickel-chromium
A combination of the characteristics of nickel and the charac...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

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

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

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

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

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

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

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

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

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

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

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

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



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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