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Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

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

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

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

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

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

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

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

Care In Annealing
Not only will benefits in machining be found by careful anne...

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

The Forging Of Steel
So much depends upon the forging of steel that this operation...

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

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

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

Quenching The Work
In some operations case-hardened work is quenched from the bo...



High-carbon Machinery Steel






Category: ANNEALING

The carbon content of this steel is above 30 points and is hardly
ever above 60 points or 0.60 per cent. Annealing such steel is
generally in quantity production and does not require the care that
the other steels need because it is very largely a much cheaper
product and a great deal of material is generally removed from
the outside surface.

The purpose for which this steel is annealed is a deciding factor
as to what heat to give it. If it is for machineability only, the
steel requires to be brought up slowly to just below the critical and
then slowly cooled in the furnace or ash pit. It must be thoroughly
covered so that there will be no access of cool air. If the annealing
is to increase ductility to the maximum extent it should be slowly
heated to slightly over the upper critical temperature and kept at
this heat for a length of time necessary for a thorough penetration
to the core, after which it can be cooled to about 1,200 deg.F., then
reheated to about 1,360 deg.F., when it can be removed and put in an
ash pit or covered with lime. If the annealing is just to relieve
strains, slow heating is not necessary, but the steel must be brought
up to a temperature not much less than a forging or rolling heat
and gradually cooled. Covering in this case is only necessary in
steel of a carbon content of more than 40 points.





Next: Annealing In Bone

Previous: Annealing Alloy Steel



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