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

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

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

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

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

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

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

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

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

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

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

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

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

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

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

Hardness Testing
The word hardness is used to express various properties of me...

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

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



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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