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

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

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

Hardening
Steel is hardened by quenching from above the upper critical....

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

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

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

Hardening
The forgings can be hardened by cooling in still air or quen...

Impact Tests
Impact tests are of considerable importance as an indication ...

The Electric Process
The fourth method of manufacturing steel is by the electric f...

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

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

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

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

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

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

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...



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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