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Steel Making

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

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

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

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

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

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

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

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

Nickel-chromium
A combination of the characteristics of nickel and the charac...

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

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

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

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

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

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

Annealing Work
With the exception of several of the higher types of alloy s...



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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