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Steel Making

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

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

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

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

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

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

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

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

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

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

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

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

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

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...

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

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

Silicon
SILICON is a very widespread element (symbol Si), being an es...

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

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...



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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