US1489243A

US1489243A - Ferronickel-chromium alloy

Info

Publication number: US1489243A
Application number: US265986A
Authority: US
Inventors: Girin Pierre
Original assignee: Commentry Fourchambault & Deca
Current assignee: Commentry Fourchambault & Deca
Priority date: 1918-12-09
Filing date: 1918-12-09
Publication date: 1924-04-08
Anticipated expiration: 1941-04-08

Description

Patented Apr. 8, 1924.

mural) sures PIERRE GIRIN. OF PARIS, FRANCE, ASSIGNOR TO SOCIETE ONYME DE CQMMENTRY,

PATENT oFrlcE.

FOURCHAMBAUL T d; DEGAZEVILLE, OF PARIS, FRANCE.

rnanourcxancmiomim ALLOY.

No Drawing.

To all whom it may concern:

. Be it known that I, PIERRE Gram, a citizen of the Republic of France, residing in Paris, France, have invented certain new e and useful Improvements in Ferronickel- Chromium Alloys, of which the following is a specification.

One of the first applications of steels chanical resistance associated with t e com-T is plete absence of brittleness, their resistance to wear and to rust, and, finally, by the possibility of avoiding, by a judicious choice of the coefiicient of expansion, which varies between 0 and 18 x per degree at according to the content in nickel, displacement and leakage, inevitable when we associate in athermal machine materials having diilerent coefiicients of expansion. But experience has shown a considerable drawback in the use of ferro-nickels in contactwith steam or hot and moist gases, a drawback which has entirely proscribed its use for members exposed to the atmospheresv above mentioned; light pittings due to rust 80 appear and ultimately produce fissures. These fissures extend from point to point, are opened by the play due to vibration, and rapidly become larger, finally compromising the solidity of the member attacked.

After a minute study of the conditions and the processes of the attack, it has. been 0 possible to discover the remedy.

The present invention concerns an alloy of iron, nickel and chromium, including, 1 perhaps, tungsten, molybdenum, cobalt,

vanadium an titanium, presenting mechanical qualities superior to those of the ferro-nickels and absolutely refractory to any local attack, or to corrosion in saturated or superheated steam or moist or hot gases.

Alloys according to the present invention contain besides iron:

menu... 25 to 40 Chromium 10 to 15 -Manganese 0.5 to 1 Carbon 0.3 to 1 80 per cent.

Application filed December 9, 1918. Serial No. 205,986.

and may contain in addition any one or more of the following:

Cobalt 0 to 10 per cent. Tungsten '2 to 5 f Molybdenum 1 to 3 Vanadium 0.2 to 1 Titanium Such additions of cobalt, tungsten, molybden-um, vanadium and (or) titanium in the proportions above stated may be made in order to improve the mechanical properties of the alloy, but they are not essential. Such additions are made at the expense of the proportion of iron remainin' We can modify the composition between wide limits without changing the essential quality of the steel which is a resistance to alteration under the conditions mentioned. An addition of tungsten, molybdenum, or cobalt, permits the mechanical resistance to be increased from kgs. up ta 90 or 100 kgs. and improves the resistance.

to Wear without increasing brittleness. The working can be facilitated and also the quality improved by an additionjof vanadium or titanium.

According to the content in nickel adopted the coefiicient of expansion will vary from 8 to 17 x'lO'. It is consequently possible to obtain a predetermined expansibility, foraexample, that of steel, 11 x 10", I

or bronze 17 x 10.

Chromium in large quantities has not only the efiect of rendering the metal more resistant and inoxidizable, but completelyprevents the hysico-chemical phenomena to which are ue the pittings and local changes peculiar to ferro-nickels. 7

Having thus described the nature of the said invention and the best means 'I know of carrying the same into practical effect, I

cent, chromium, 10 to 15 per cent,'manganese, 0.5 to 1 per cent, and carbon, 0.3 to 1 per cent, such alloy being inoxidizable and unalterable in superheated steam and in moist and hot gases, havin' high mechani:

' i cal resistance. without britt ene'ss and great resistance to wear, and having any required Q i I I 1361x243 coefii'eient ofexpansion between 8 and 17 x from 1 to 5 per cent.of e-metal in the na- 10", notably those of steel, bronze or. glass. 'ture of tungsten.

2. The'alloyof claim 1; conta'inin also 4. The alloy of claim 1, containing also 10 from 1 to 5 per cent of a metal in t e 1111- from 1 ta 5 per cent'of molybdenum. 5 ture of tungsten, and from 0.1 to 1 per cent In .witness whereof, I have" hereunto of a metal in the nature of vanadium. signed my name. I

3. The alloy of claim 1, containing also I PIERRE GIRIN.