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Double Annealing
Water annealing consists in heating the piece, allowing it to...

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

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

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

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

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

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

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

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

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

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

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

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

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

Annealing
ANNEALING can be done by heating to temperatures ranging from...

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

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



Double Annealing






Category: HARDENING CARBON STEEL FOR TOOLS

Water annealing consists in heating the piece, allowing it to cool
in air until it loses its red heat and becomes black and then
immediately quenching it in water. This plan works well for very
low-carbon steel; but for high-carbon steel what is known as the
double annealing treatment must be given, provided results are
wanted quickly. The process consists in heating the steel quickly to
200 deg. or more above the upper critical, cooling in air down through
the recalescence point, then reheating it to just above the critical
point and again cooling slowly through the recalescence, then quenching
in oil. This process retains in the steel a fine-grained structure
combined with softness.





Next: Quenching Tool Steel

Previous: Annealing To Relieve Internal Stresses



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