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

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

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

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

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

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

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

Alloying Elements
Commercial steels of even the simplest types are therefore p...

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

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

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

High Speed Steel
For centuries the secret art of making tool steel was handed ...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

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

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

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

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

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

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

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



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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