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Steel Making

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

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

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

Compensating Leads
By the use of compensating leads, formed of the same materia...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

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

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

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

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

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

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

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

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...



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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