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Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

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

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

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

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

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

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

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

Annealing Work
With the exception of several of the higher types of alloy s...

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

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

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

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

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

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Sulphur
SULPHUR is another element (symbol S) which is always found i...

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



Annealing Work






Category: HEAT TREATMENT OF STEEL

With the exception of several of the higher types
of alloy steels, where the percentages of special elements run quite
high, which causes a slight air-hardening action, the carburizing
steels are soft enough for machining when air cooled from any
temperature, including the finishing temperature at the hammer.
This condition has led many drop-forge and manufacturing concerns
to consider annealing as an unnecessary operation and expense.
In many cases the drop forging has only been heated to a low
temperature, often just until the piece showed color, to relieve
the so-called hammer strains. While this has been only a compromise
it has been better than no reheating at all, although it has not
properly refined the grain, which is necessary for good machining
conditions.

Annealing is heating to a temperature slightly above the highest
critical point and cooling slowly either in the air or in the furnace.
Annealing is done to accomplish two purposes: (1) to relieve mechanical
strains and (2) to soften and produce a maximum refinement of grain.





Next: Process Of Carburizing

Previous: Heat Treatment Of Gear Blanks



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