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Steel Making

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

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

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

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

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

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

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

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

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

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

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

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

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

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

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

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

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...



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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