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Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

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

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

Conclusions
Martien was probably never a serious contender for the honor ...

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

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

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

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

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

Gears
The material used for all gears on the Liberty engine was sel...

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

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

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

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

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

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

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



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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