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Steel Making

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

Annealing
ANNEALING can be done by heating to temperatures ranging from...

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...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Nickel
Nickel may be considered as the toughest among the non-rare a...

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

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

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

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

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

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

The Forging Of Steel
So much depends upon the forging of steel that this operation...

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

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

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

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.





Next: Annealing

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



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