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Steel Making

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

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

Corrosion
This steel like any other steel when distorted by cold worki...

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Drop Forging Dies
The kind of steel used in the die of course influences the he...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

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

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

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Annealing
ANNEALING can be done by heating to temperatures ranging from...

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

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

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

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Crucible Steel
Crucible steel is still made by melting material in a clay or...

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



Effects Of Proper Annealing






Category: HEAT TREATMENT OF STEEL

Proper annealing of low-carbon steels
causes a complete solution or combination to take place between
the ferrite and pearlite, producing a homogeneous mass of small
grains of each, the grains of the pearlite being surrounded by
grains of ferrite. A steel of this refinement will machine to good
advantage, due to the fact that the cutting tool will at all times
be in contact with metal of uniform composition.

While the alternate bands of ferrite and pearlite are microscopically
sized, it has been found that with a Gleason or Fellows gear-cutting
machine that rough cutting can be traced to poorly annealed steels,
having either a pronounced banded structure or a coarse granular
structure.





Next: Temperature For Annealing

Previous: Process Of Carburizing



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