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The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

The Thermo-couple
With the application of the thermo-couple, the measurement of...

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

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

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

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

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Hardening
The forgings can be hardened by cooling in still air or quen...

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

The Electric Process
The fourth method of manufacturing steel is by the electric f...



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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