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

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

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

Critical Points
One of the most important means of investigating the properti...

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

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

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

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

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

Air-hardening Steels
These steels are recommended for boring, turning and planing...

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

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

Manganese
Manganese adds considerably to the tensile strength of steel,...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

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



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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