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Steel Making

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

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

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

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

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

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

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

Manganese
Manganese adds considerably to the tensile strength of steel,...

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

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

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

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



High-chromium Or Rust-proof Steel






Category: ALLOYS AND THEIR EFFECT UPON STEEL

High-chromium, or what is called stainless steel containing from
11 to 14 per cent chromium, was originally developed for cutlery
purposes, but has in the past few years been used to a considerable
extent for exhaust valves in airplane engines because of its resistance
to scaling at high temperatures.

Percentage
Carbon 0.20 to 0.40
Manganese, not to exceed 0.50
Phosphorus, not to exceed 0.035
Sulphur, not to exceed 0.035
Chromium 11.50 to 14.00
Silicon, not to exceed 0.30

The steel should be heated slowly and forged at a temperature above
1,750 deg.F. preferably between 1,800 and 2,200 deg.F. If forged at temperatures
between 1,650 and 1,750 deg.F. there is considerable danger of rupturing
the steel because of its hardness at red heat. Owing to the
air-hardening property of the steel, the drop-forgings should be
trimmed while hot. Thin forgings should be reheated to redness
before trimming, as otherwise they are liable to crack.

The forgings will be hard if they are allowed to cool in air. This
hardness varies over a range of from 250 to 500 Brinell, depending
on the original forging temperature.





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Previous: Effect Of A Small Amount Of Copper In Medium-carbon Steel



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