DE945094C - Alkali-resistant steel - Google Patents
Alkali-resistant steelInfo
- Publication number
- DE945094C DE945094C DEP36456A DEP0036456A DE945094C DE 945094 C DE945094 C DE 945094C DE P36456 A DEP36456 A DE P36456A DE P0036456 A DEP0036456 A DE P0036456A DE 945094 C DE945094 C DE 945094C
- Authority
- DE
- Germany
- Prior art keywords
- steels
- carbon
- unalloyed
- titanium
- brittleness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Description
Laugenbeständiger Stahl Unter der Einwirkung von heißen Salzlösungen, z. B. Natronlauge, erfahren Stähle eine Minderung ihrer Eigenschaften, die man in der Technik unter dem Begriff Laugensprödigkeit zusammengefaßt hat. Diese Fehlererscheinung tritt bevorzugt dann auf, wenn der Stahl gleichzeitig mechanisch beansprucht ist, z. B. unter einer elastischen Spannung steht. Die schon seit Jahrzehnten anhaltenden Bemühungen, den Stahl gegen diese Versprödung unempfindlich zu machen, haben bisher nicht zu einem vollen Erfolg geführt. So hat man z. B. vorgeschlagen, eine Behandlung des Stahles mit desoxydierenden Mitteln, z. B. Aluminium oder Titan, in einem solchen Maße vorzunehmen, daß der Stahl seine Anfälligkeit gegen Alterung verliert. Zur Beseitigung der Laugensprödigkeit führte dieser Weg aber nur zu einem Teilerfolg, da insbesondere niedrig gekohlte Stähle mit Kohlenstoffgehalten unter o,r5 % durch diese Maßnahmen in ihrer Empfindlichkeit gegen Laugensprödigkeit kaum beeinflußt werden. Deshalb mußte zur Verminderung der Anfälligkeit gegen die Versprödung durch den Angriff der genannten Mittel eine spezifische Wärmebehandlung angewendet werden. All diesen Bemühungen war nur ein Teilerfolg beschieden.Alkali-resistant steel Under the action of hot salt solutions, z. B. caustic soda, steels experience a reduction in their properties, which can be seen in the technology has summarized under the term lye brittleness. This error phenomenon preferably occurs when the steel is simultaneously mechanically stressed, z. B. is under elastic tension. The ones that have been going on for decades Efforts to make the steel insensitive to this embrittlement have so far did not lead to complete success. So one has z. B. suggested a treatment of the steel with deoxidizing agents, e.g. B. aluminum or titanium, in such a Measure that the steel loses its susceptibility to aging. To the Removal of the brittleness of the caustic solution only led to partial success, especially because low-carbon steels with carbon contents below 0.5% penetrate hardly influenced these measures in their sensitivity to lye brittleness will. It was therefore necessary to reduce the susceptibility to embrittlement A specific heat treatment is applied to the attack of the agents mentioned. All these efforts were only partially successful.
Erfindungsgemäß gelingt es, die Anfälligkeit von Stählen gegenüber dein Angriff der sonst zu Laugensprödigkeit führenden Mittel in bisher unbekanntem Maße herabzusetzen bzw. ganz zu beseitigen. .According to the invention it is possible to reduce the susceptibility of steels your attack on the remedies that otherwise lead to lye brittleness in hitherto unknown Dimensions reduce or completely eliminate. .
Erfindungsgemäß werden für Gegenstände, die laugenbeständig sein sollen, unlegierte bzw. schwachlegierte Stähle verwendet, deren Kohlenstoffgehalt durch Titan oder einen ähnlich wirkenden starken Carbidbildner abgebunden ist. Als weitere Carbidbildner dieser Art kommen insbesondere Tantal-Niob, Zirkon und Vanadin in Betracht. Diese Elemente können außer oder an Stelle des Titans einzeln oder zu mehreren Verwendung finden. Der Gehalt derartiger Elemente im Stahl soll erfindungsgemäß so bemessen sein, daß der Kohlenstoffgehalt des Stahles durch sie abgebunden ist. Die Abbindung des Kohlenstoffs geht vor sich, nachdem andere Begleitelemente des Stahles, wie Sauerstoff; Stickstoff und Schwefel, bereits eine Bindung mit Titan eingegangen sind (vgl. Bericht Nr.65 des Vereins Deutscher Eisenhüttenleute, 1944, Fry : »Titan als Legierungselement im Stahl«).According to the invention for objects that should be alkali-resistant, unalloyed or weakly alloyed steels are used, their carbon content through Titanium or a similarly acting strong carbide former is set. As another Carbide formers of this type are particularly popular with tantalum-niobium, zirconium and vanadium Consideration. These elements can be used individually or in place of titanium find several uses. The content of such elements in the steel should according to the invention be dimensioned so that the carbon content of the steel is bound by them. The setting of the carbon takes place after other accompanying elements of the Steel, such as oxygen; Nitrogen and sulfur, already bonded with titanium (see report 65 of the Association of German Ironworkers, 1944, Fry: "Titanium as an alloying element in steel").
Die Festigkeit solcher Stähle kann, falls es erwünscht ist, in bekannter Weise durch festigkeitssteigernde Elemente wie Mangan, Silizium, Nickel, Molybdän), Wolfram, Chrom und Kupfer erhöht werden. Aus wirtschaftlichen Gründen wird man dabei im allgemeinen einen Höchstbetrag an diesen Elementen von 3 °/o nicht überschreiten.The strength of such steels can, if so desired, be known in a known manner By strength-increasing elements such as manganese, silicon, nickel, molybdenum), Tungsten, chromium and copper are increased. For economic reasons you will be there generally not to exceed a maximum of 3 ° / o for these elements.
Der Kohlenstoffgehalt der Stähle wird zweckmäßig unter 0,25°/a,, vorzugsweise unter o,i5°/o gehalten, schon um den Verbrauch an kohlenstoffabbindenden Elementen nicht zu groß werden zu lassen.The carbon content of the steels is expediently below 0.25% / a, preferably kept below 0.15 per cent, even by the consumption of carbon-binding elements not to get too big.
Bei den erfindungsgemäß zu verwendenden Stählen erübrigt es sich, eine der bekannten Wärmebehandlungen anzuwenden, die sonst zur Verbesserung der Laugenbeständigkeit führen. Eine derartige Wärmebehandlung käme nur dann in Betracht, wenn die Abbindung des Kohlenstoffs :aus irgendwelchen Gründen das vorgeschriebene Maß nicht erreicht. haben sollte.In the case of the steels to be used according to the invention, there is no need to apply one of the well-known heat treatments that would otherwise improve the Lead to alkali resistance. Such a heat treatment would only be considered if if the binding of carbon: for whatever reason the prescribed Level not reached. should have.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP36456A DE945094C (en) | 1949-03-11 | 1949-03-11 | Alkali-resistant steel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP36456A DE945094C (en) | 1949-03-11 | 1949-03-11 | Alkali-resistant steel |
Publications (1)
Publication Number | Publication Date |
---|---|
DE945094C true DE945094C (en) | 1956-06-28 |
Family
ID=7374781
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEP36456A Expired DE945094C (en) | 1949-03-11 | 1949-03-11 | Alkali-resistant steel |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE945094C (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1047583B (en) * | 1955-07-13 | 1958-12-24 | Boehler & Co Ag Geb | Use of an iron alloy for additional wires for metal arc welding of unalloyed steels in inert protective gas |
DE1533435B1 (en) * | 1965-12-17 | 1971-07-29 | Nippon Steel Corp | USE OF LOW CARBON MANGANE AND TUNGSTEN STEEL SHEET FOR DEEP DRAWING PURPOSES |
DE102008026154A1 (en) * | 2008-05-30 | 2009-12-03 | Bayerische Motoren Werke Aktiengesellschaft | Steel alloy with alloying element for the protection against corrosion and/or embrittlement effect, useful in automotive engineerings |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR810576A (en) * | 1935-09-16 | 1937-03-24 | Stahlwerke Rochling Buderus A | Application of alloys containing chromium, molybdenum and titanium to the constitution of objects requiring resistance to corrosion, for example with regard to aqueous solutions of elemental chlorine, hypochlorous acid, its salts and their solutions |
GB465999A (en) * | 1935-09-16 | 1937-05-20 | Stahlwerke Roechling Buderus | Improvements in articles that are subjected to and must resist attack by solutions containing free chlorine or hypochlorous acid, its salts and solutions thereof |
US2110891A (en) * | 1935-05-07 | 1938-03-15 | Reitz Heinrich | Corrosion-resistant and cold workable molybdenum steel |
-
1949
- 1949-03-11 DE DEP36456A patent/DE945094C/en not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2110891A (en) * | 1935-05-07 | 1938-03-15 | Reitz Heinrich | Corrosion-resistant and cold workable molybdenum steel |
FR810576A (en) * | 1935-09-16 | 1937-03-24 | Stahlwerke Rochling Buderus A | Application of alloys containing chromium, molybdenum and titanium to the constitution of objects requiring resistance to corrosion, for example with regard to aqueous solutions of elemental chlorine, hypochlorous acid, its salts and their solutions |
GB465999A (en) * | 1935-09-16 | 1937-05-20 | Stahlwerke Roechling Buderus | Improvements in articles that are subjected to and must resist attack by solutions containing free chlorine or hypochlorous acid, its salts and solutions thereof |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1047583B (en) * | 1955-07-13 | 1958-12-24 | Boehler & Co Ag Geb | Use of an iron alloy for additional wires for metal arc welding of unalloyed steels in inert protective gas |
DE1533435B1 (en) * | 1965-12-17 | 1971-07-29 | Nippon Steel Corp | USE OF LOW CARBON MANGANE AND TUNGSTEN STEEL SHEET FOR DEEP DRAWING PURPOSES |
DE102008026154A1 (en) * | 2008-05-30 | 2009-12-03 | Bayerische Motoren Werke Aktiengesellschaft | Steel alloy with alloying element for the protection against corrosion and/or embrittlement effect, useful in automotive engineerings |
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