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

Furnace Data
In order to give definite information concerning furnaces, fu...

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

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

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

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Chromium
Chromium when alloyed with steel, has the characteristic func...

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

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

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

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

Air-hardening Steels
These steels are recommended for boring, turning and planing...

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

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

Compensating Leads
By the use of compensating leads, formed of the same materia...

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



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.





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



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