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Steel Making

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

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

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

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

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

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

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

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

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

Heating
Although it is possible to work steels cold, to an extent de...

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

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

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

Tensile Properties
Strength of a metal is usually expressed in the number of pou...



Temperature For Annealing






Category: HEAT TREATMENT OF STEEL

Theoretically, annealing should be
accomplished at a temperature at just slightly above the critical
point. However, in practice the temperature is raised to a higher
point in order to allow for the solution of the carbon and iron to
be produced more rapidly, as the time required to produce complete
solution is reduced as the temperature increases past the critical
point.

For annealing the simpler types of low-carbon steels the following
temperatures have been found to produce uniform machining conditions
on account of producing uniform fine-grain pearlite structure:

0.15 to 0.25 per cent carbon, straight carbon steel.--Heat to 1,650 deg.F.
Hold at this temperature until the work is uniformly heated; pull
from the furnace and cool in air.

0.15 to 0.25 per cent carbon, 1-1/2 per cent nickel, 1/2 per cent
chromium steel.--Heat to 1,600 deg.F. Hold at this temperature until
the work is uniformly heated; pull from the furnace and cool in air.

0.15 to 0.25 per cent carbon, 3-1/2 per cent nickel steel.--Heat
to 1,575 deg.F. Hold at this temperature until the work is uniformly
heated; pull from the furnace and cool in air.





Next: Care In Annealing

Previous: Effects Of Proper Annealing



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