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Steel Making

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

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

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

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

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

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

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

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

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

Connecting Rods
The material used for all connecting rods on the Liberty engi...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

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

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

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

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

The Influence Of Size
The size of the piece influences the physical properties obta...

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

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

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

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



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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