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Steel Making

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

Conclusions
Martien was probably never a serious contender for the honor ...

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

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

Furnace Data
In order to give definite information concerning furnaces, fu...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

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

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

Chromium
Chromium when alloyed with steel, has the characteristic func...

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

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

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

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

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

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

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

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

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...



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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