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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

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

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

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

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

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

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

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

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

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

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

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



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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