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

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

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

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

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

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

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...

The Influence Of Size
The size of the piece influences the physical properties obta...

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

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

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

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

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

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

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

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

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

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



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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