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

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

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Gears
The material used for all gears on the Liberty engine was sel...

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

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

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

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

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

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

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

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

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

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

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

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

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

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...



Nickel-chromium






Category: ALLOYS AND THEIR EFFECT UPON STEEL

A combination of the characteristics of nickel and the characteristics
of chromium, as described, should obviously give a very excellent
steel as the nickel particularly affects the ferrite of the steel
and the chromium the carbon. From this combination, we are able to
get a very strong ferrite matrix and a very hard tough cementite.
The strength of a strictly pearlitic steel over a pure iron is due
to the pearlitic being a layer arrangement of cementite running
parallel to that of a pure iron layer in each individual grain. The
ferrite i.e., the iron is increased in strength by the resistance
offered by the cementite which is the simple iron-carbon combination
known to metallurgists as Fe3C. The cementite, although adding
to the tensile strength, is very brittle and the strength of the
pearlite is the combination of the ferrite and cementite. In the
event of the cementite being strengthened, as in the case of strictly
chromium steels, an increased tensile strength is readily obtained
without loss of ductility and if the ferrite is strengthened then
the tensile strength and ductility of the metal is still further
improved.

Nickel-chromium alloy represents one of the best combinations available
at the present time. The nickel intensifies the physical characteristics
of the chromium and the chromium has a similar effect on the nickel.

For case-hardening, nickel-chromium steels seem to give very excellent
results. The carbon is very rapidly taken up in this combination,
and for that reason is rather preferable to the straight nickel steel.

With the mutually intensifying action of chromium and nickel there
is a most suitable ratio for these two alloys, and it has been found
that roughly 2-1/2 parts of nickel to about 1 part of chromium
gives the best results. Therefore, we have the standard types of
3.5 per cent nickel with 1.5 per cent chromium to 1.5 per cent
nickel with 0.6 per cent chromium and the various intermediate
types. This ratio, however, does not give the whole story of
nickel-chromium combinations, and many surprising results have
been obtained with these alloys when other percentage combinations
have been employed.





Next: Vanadium

Previous: Chromium



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