Objects out of steel or cast iron resisting the attack of the corrosive agents, and proceeded for their manufacture

MINISTRY OF COMMERCE AND INDUSTRY.

DIRECTION OF THE INDUSTRIAL PROPERTY.

Gr. 8.- Cl. 3. No. 719,774

Society DUVAL Frères AUBERT and residing in France (Seine).

Demanded 24 January 1929, to 13^{m h 56,} to Paris.

Issued the ' ik [...] November. -Published the [...] February 1932.

(Patent application deposited in Germany the a6 January 1928.-Declaration the applicant.)

Various methods have previously been described for

render objects resistant steel or cast iron

to attack by corrosive agents in the with-

health by nitriding a coating [...] -

engine. The results required of these

proposals are not designed, and the

objects steel or cast iron nitrided resistant

i ' attack of the corrosive agents are not

input to the current use. A

object produce objects on such-

[...] those who have it is recently question

in the ratio of the resistance

corrosive and exerts thereon no ac-

a changing their composition, and a

[...] of manufacture for [...] -

[...] of the objects. This is

reaches, above all, that the articles are

established in a steel alloy or cast iron con-

piece which-alone or in combination

concha of aluminum, silicon, the man-

[...], nickel, chromium, molybdenum,

tungsten, vanadium, titanium or

zirconium, and nitrided layers are in their

surface to a degree sufficient to

these objects [...] resistant to the action of the agents

corrosive (in particular liquids, vapors

and gases). In this case the nitriding can

be pushed far enough for which is worthy compensation-

casing and simultaneously a significant pro-

based raising the hardness; however, it is

also possible to delete the nitriding deep before the increase of the hardness occurs, while achieving resistance to the attack of corrosive agents. 35 A method suitable for production of objects indicated comprises subjecting, to i 'finite state and preferably at a temperature not exceeding 58o ° g. steel alloys or for, alone or in any [...][...], aluminum, silicon, manganese, nickel, chromium, molybdenum, tungsten, vanadium, titanium or zirconium to the action of-producing substances i' nitrogen and 45 long enough so that, in their outer layers, they are nitrided to a degree providing ' to the objects resistance against the corrosive agents and bringing them in such a state that they can have on these agents no action (by 5o example catalytic) to alter the composition.

SUMMARY:

Objects made of steel or interference from civilians resistance to corrosive agents, wherein 05 that the articles are established in a steel alloy or cast iron containing alone or in any combination of aluminum, silicon, manganese, nickel, chromium, the booklet Price: 5 francs.

molybdenum, tungsten, vanadium, titanium or zirconium, and that they are nitrided in their surface layers to a degree sufficient to be rendered resistant to 5 the action of the corrosive agents (in particular liquids, vapors and gases);

has^{0 A method for} the manufacture of objects as i^e, characterized in that steel alloys or for, [...] either alone or in any proportions, aluminum, silicon, manganese, nickel, chromium, molybdenum, tungsten, vanadium, titanium or zirconium are subjected to hot, to the action of substances which release nitrogen that the time sufficient to 1 that their surface layers become resistant to the action of corrosive agents without influencing action thereof changing their composition.

vanadium, titanium or zirconium are subjected to hot, to the action of substances which release nitrogen that the time sufficient to 1 that their surface layers become resistant to the action of corrosive agents without influencing action thereof changing their composition.

AUBERT and SOCIETY DUVAL Frères.

For proxy:

[...].

For the sale of the fascicles, be directed to [...] Nationale, 37, ia Convention street. Paris (i5 *).