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Steel Making

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

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

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

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

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

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

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

The Thermo-couple
With the application of the thermo-couple, the measurement of...

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

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

Machineability
Reheating for machine ability was done at 100 deg. less than ...

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

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

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

Piston Pin
The piston pin on an aviation engine must possess maximum res...



Annealing Work






Category: HEAT TREATMENT OF STEEL

With the exception of several of the higher types
of alloy steels, where the percentages of special elements run quite
high, which causes a slight air-hardening action, the carburizing
steels are soft enough for machining when air cooled from any
temperature, including the finishing temperature at the hammer.
This condition has led many drop-forge and manufacturing concerns
to consider annealing as an unnecessary operation and expense.
In many cases the drop forging has only been heated to a low
temperature, often just until the piece showed color, to relieve
the so-called hammer strains. While this has been only a compromise
it has been better than no reheating at all, although it has not
properly refined the grain, which is necessary for good machining
conditions.

Annealing is heating to a temperature slightly above the highest
critical point and cooling slowly either in the air or in the furnace.
Annealing is done to accomplish two purposes: (1) to relieve mechanical
strains and (2) to soften and produce a maximum refinement of grain.





Next: Process Of Carburizing

Previous: Heat Treatment Of Gear Blanks



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