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Steel Making

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

Corrosion
This steel like any other steel when distorted by cold worki...

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

Crankshaft
The crankshaft was the most highly stressed part of the entir...

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

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

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Nickel
Nickel may be considered as the toughest among the non-rare a...

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

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

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

Drop Forging Dies
The kind of steel used in the die of course influences the he...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

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



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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