US1422096A - Alloy containing iron, nickel, chromium - Google Patents

Description

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0F PARIS, FRANCE, ASSIGNOR 1'0 SOCIETE ANONYME DE COMMENTBY, EOURGHAMBAULT, & DEGAZEVILLE, OF PARIS, FRASCE. A

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T 0 all wiwm it may concern:

Be it known that I, Pmnnn GIRIN, a citizen of the Republic of France, residing in Paris, France, have invented certain new and useful Improvements in a new Alloy Contalning Iron, Nickel, Chromium, of which the following is a specification.

Up to the present I am not acquainted,

from the point of view of their application to chemical industries, with common alloys and metals which unite high mechanical qualities with a high resistance to the action of acids.

The present invention relates to alloys of iron, nickel, chromium, and manganese, to which may be added other metals, such alloy being susceptible of being cast, forged, rolled, drawn out, and otherwise worked and treated in the most complex manner, having a high mechanical resistance and a complete absence of fragility at all temperatures and practically unattacked by strong acids, especially organic acids, and equally by alkalis in solution or in fusion. Such an alloy may comprise besides iron Nickel 20 to 25 per cent. Chromium" 10. -170 15- Manganese 1 ,to 2 Carbon 0.2 to 0.5 p

The compositions given above may undergo relatively important variations without the essential properties being sensibly modified; in particular the content in nickel may be cairied even up to 40 per cent if we wish to best fulfil the conditions relating either to the elasticity or the coeflicient of expansion of the alloy.

The manganese in the alloy insures satisfactory malleability.

The combined action of the nickel and of the chromium is to bring the iron into the condition 7. The alloy has then the mechanical advantages of. ferro-nickels of 25 per cent nickel, withor without 'a small quantity of chromium, notably the property of being considerably deformed without rendering any irreversible transformation Specification of Letters Patent.

prolonged exposure to hot and moist gasesz' it suppresses, for example, the pittings and local changes which are an essential obstacle to the use in these conditions of ferronickel, with or without small additions of chromium.

The addition of chromium in' considerable quantities, such as 10 to 15 per cent, to a ferro-nickel reduces the corrosion of the metal by strong acidseither hot or coldto an insignificant amount.

By way of example. I may note that an alloy of the group defined above possesses at ordinary temperature a mechanical resistance of to 80 kgs. per sq. mm., with a coeiiicient of elongation of 30 per cent and a' resilience which never falls below 25 kgms, as measured by the Guillery apparatus on a sample of a 10 mm. ube having a rounded groove of a depth of',2 mm In .cold concentrated nitric acid the loss of in chemical industry for all the apparatus .of complicated form or which is required to resist shocks whether due to high pressure (such as the worms, norias. centrifugal pumps etc) which are required to be in contact with acid materials. It would replace gold in' the manufacture of inoxidizable pens. p

Having thus described the nature of the said invention and the best means'I know of carrying the same into practical effect, I declare that what I claim is:- V

An alloy of iron, nickel, chromiiun and manganese, containing nickel, 20 to 25 per cent, chromium, 10 to 15 per cent, manganese', 1 to 2 per cent, carbon, 0.2 to 0.5 per Patented July Ill, 1922.

Application filed. December 9, 1918. Serial No. 265,984.

cent, such alloy having, together with the 'mechanical qualities of the best steels. a

high' resistance to attack by strong acids, organic acids and alkalis, in solution or in fusion.

'In witness whereof, I have hereunto signed my name. 7 r

PEERRE GKREEI.