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Steel Making

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

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

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

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

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

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

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

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

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

The Modern Hardening Room
A hardening room of today means a very different place from ...

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

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

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

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

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

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

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

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...



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.





Next: Annealing

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



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