BE378317A

BE378317A -

Info

Publication number: BE378317A
Authority: BE

Description

       

   <Desc/Clms Page number 1> 
      



  Société Anonyme Fried. Krupp aktiengesellschaft à Essen   (Allemagne).   



   Acier non magnétique. 



  Les aciers non magnétiques au manganèse   connus pré-   sentent   l'inconvénient   qu'ils ne se laissent usiner que difficilement par des outils enlevant des copeaux. 



   La présente invention a pour but d'obtenir des aciers non magnétiques, qui se caractérisent par de bonnes proprié- tés mécaniques et par la facilité d'usinage par des outils enlevant des copeaux. Ce but est atteint, conformément à l'invention, par des alliages d'acier, qui renferment de   8 à   25% de manganèse, de 0 à 1,5% de   silicium   et   dont     la   teneur en carbone est au maximum un vingtième de la teneur en manganèse. 



   La texture austénitique au moins prédominante des aciers peut être obtenue par un traitement thermique approprié, (par exemple par refroidissement brusque à partir de 1000  C environ ou par   le   travail à chaud (coulée, laminage, forgeage)). 



   ON peut encore améliorer   l a   facilité d'usinage en ajoutant aux aciers mentionnés des constituants d'alliage 

 <Desc/Clms Page number 2> 

 donnant forment   lieu à   la formation de carbures ( par exemple jusqu'à environ 5% de titane, de   chrôme,   de vanadium de molybdène), qui séparent de la masse de base une partie de la teneur en carbone, qui exerce une influence sur la facilité d'usinage. 



   Les aciers suivant l'invention   peuvent   par exemple posséder la composition suivante: 0,3 à 0,4% de C, 17 à 205 de Nn et 1% de Cr. 



   Ces aciers se   laissent facilement   usiner par des outils enlevant des copeaux; en particulier le sciage, le forage et le filetage ne présentent pas de difficultés avec ces aciers.



   <Desc / Clms Page number 1>
      



  Société Anonyme Fried. Krupp aktiengesellschaft in Essen (Germany).



   Non-magnetic steel.



  Known non-magnetic manganese steels have the drawback that they can only be machined with difficulty by tools which remove chips.



   The object of the present invention is to obtain non-magnetic steels which are characterized by good mechanical properties and by ease of machining by tools which remove chips. This object is achieved, according to the invention, by steel alloys which contain 8 to 25% manganese, 0 to 1.5% silicon and whose carbon content is at most one twentieth of the manganese content.



   The at least predominant austenitic texture of steels can be obtained by an appropriate heat treatment (for example by sudden cooling from around 1000 C or by hot work (casting, rolling, forging)).



   The ease of machining can be further improved by adding alloying constituents to the steels mentioned.

 <Desc / Clms Page number 2>

 giving rise to the formation of carbides (e.g. up to approx. 5% titanium, chromium, molybdenum vanadium), which separate part of the carbon content from the base mass, which exerts an influence on the ease of machining.



   The steels according to the invention can for example have the following composition: 0.3 to 0.4% of C, 17 to 205 of Nn and 1% of Cr.



   These steels can be easily machined by tools which remove chips; in particular sawing, drilling and threading do not present any difficulties with these steels.

Claims

R e v e n d i c a t ion s.

1 p- A non-magnetic steel, characterized by a manganese content of 8 to 25%, a silicon content of 0 to 1.5% and a carbon content of at most one twentieth of the manganese content.

20- A steel according to 1 characterized in that it has an at least predominant austenitic content, which has been obtained by heat treatment (for example by sudden cooling from about 10,000 C) or by hot work (for example by casting, rolling, forging.

3 - An a, cier according to 1 and 2 characterized in that one or more elements, strongly giving rise to the formation of carbides (for example up to 5% of titanium, chrone, vanadium, molybdenum), are added to the 'steel.

4 - A steel according to 3 - characterized in that it contains about 0.3 to 0.4o carbon, 17 to 20% manganese and 1% chrome.

Summary s u c c i n c t.

--------- A non-magnetic steel having a manganese content of 8 to 25%, a silicon content of C to 1.5% and a carbon content not exceeding one twentieth of the manganese content