EP0391054B1 - Verwendung eines hitzebeständigen Stahls für korrosionsbeständige Bauteile - Google Patents

Verwendung eines hitzebeständigen Stahls für korrosionsbeständige Bauteile Download PDF

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Publication number
EP0391054B1
EP0391054B1 EP90103396A EP90103396A EP0391054B1 EP 0391054 B1 EP0391054 B1 EP 0391054B1 EP 90103396 A EP90103396 A EP 90103396A EP 90103396 A EP90103396 A EP 90103396A EP 0391054 B1 EP0391054 B1 EP 0391054B1
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EP
European Patent Office
Prior art keywords
max
steel
corrosion
resistant
steels
Prior art date
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Revoked
Application number
EP90103396A
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German (de)
English (en)
French (fr)
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EP0391054A1 (de
Inventor
Karl-Heinrich Dr.-Ing. Michel
Horst Dipl.-Ing. Mülders
Ingo Dipl.-Ing. Stellfeld
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Krupp Hoesch Stahl AG
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Krupp Stahl AG
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    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum

Definitions

  • the invention relates to the use of a heat-resistant steel for corrosion-resistant components, such as exhaust systems.
  • austenitic chromium-nickel steels such as material no. 1.4878 or 1.4828 according to the steel-iron list of the VdEh, Verlag Stahleisen mbH, Düsseldorf, 7th edition 1981, used.
  • the main disadvantage of these austenitic steels is their high thermal expansion coefficients.
  • DE-PS 27 50 623 a steel with 17 to 18% chromium and a zirconium addition of up to 1.5% is preferred for exhaust systems.
  • the ferritic steels mentioned have sufficient heat and scale resistance at chromium contents of 17 to 18%.
  • adverse material properties can occur.
  • Higher chrome contents have a negative impact on the forming and deep-drawing behavior.
  • Problems with welding can also increase.
  • a disadvantage of the application for exhaust systems provided here is above all that the so-called "475 ° embrittlement" occurs. At higher temperatures between 600 and 800 degrees Celsius, so-called ⁇ -phase embrittlement also occurs (E. Houdremont, Handbuch der Sonderstahlischen 1969, volume 1, pages 684 ff; DE-Z Tech. Mitt. Krupp works reports volume 33 (1975 ), Volume 2, pages 45 ff).
  • Remainder iron and unavoidable impurities in the form of hot and / or cold rolled strip with good forming and welding properties as a material for the production of corrosion-resistant components that can withstand temperatures up to 950 ° C are used, in particular from exhaust systems, such as exhaust systems for internal combustion engines or mantles or from connecting pipes for exhaust gas catalysts.
  • the steel to be used according to the invention preferably has the following composition: 0.012 to 0.018% C 0.40 to 0.60% Si 0.40 to 0.60% Mn Max. 0.035% P Max. 0.010% S 15.0 to 16.0% Cr Max. 0.016% N 0.4 to 0.7% Nb 0.4 to 0.7% Ti 0.2 to 0.3% Zr Remainder iron and usual impurities due to melting.
  • the steel to be used according to the invention a material has thus been found which is suitable for components which are used at temperatures of up to 950 ° C. and which, at the same time, is suitable for the rear area of an exhaust system because of its good corrosion properties.
  • the decisive factor for the good properties of the steel according to the invention is the simultaneous addition of the elements niobium, titanium and zirconium in the claimed alloy ratio.
  • the test was carried out in a 120-hour test with cooling in air for 24 hours in accordance with the guidelines of the Association of German Ironworks.
  • a steel is considered to be scale-resistant at a certain temperature if the weight of the scaled-down amount of metal does not exceed around 1 g / m2h at this temperature and around 2 g / m2h at a temperature that is 50 ° C higher.
  • the steel (A) to be used according to the invention has a scale loss curve comparable to the much more expensive austenitic chromium-nickel steel (D). Both steels can withstand temperatures of around 950 ° C.
  • the 11% chromium steel (B) is in no way up to the temperatures of up to 950 ° C.
  • the 17% chrome steel (C) is also inferior to the steel (A) in terms of scale resistance.
  • Table 1 shows the coefficients of thermal expansion of the investigated steels A (according to the invention), B, C, and D (comparative steels). It can be seen that the steel A to be used according to the invention is within the scope of the known ferritic steels B and C, but has a significantly lower coefficient of expansion than the austenitic steel D.
  • the rest of the iron and melting-related impurities were melted in the AOD process.
  • the ratio of niobium: titanium: zirconium was 2: 2.04: 1, the sum of the elements niobium, titanium and zirconium was 1.31%.
  • the steel was cast into slabs, which were then rolled into hot strip. A strip was descaled, cold rolled and annealed in an open pull-through furnace at around 980 ° C, pickled and then lightly rolled (dressed). Exhaust systems with catalytic converters were produced from this cold strip, version IIIc according to DIN 17 441. There were no peculiarities in the manufacture of pipes, the deep-drawing of the catalyst parts and the subsequent welding of the system.
  • This exhaust system made of the stressed steel was compared to a conventional exhaust system, the front area including catalyst made of austenitic steel material no. 1.4878 had been produced and contained compensators to compensate for the strong thermal expansion, while the rear area, as usual, made of ferritic steel, material no. 1.4512 passed, tested in laboratory and practical tests.
  • the behavior in the front high temperature range was flawless for both materials.
  • In the rear, colder area of the exhaust system there was no significant corrosion attack on the steel to be used according to the invention, while the material 1.4512 showed significant damage, particularly as a result of a hole-like corrosion attack.
  • a second strip was annealed and descaled in the open pull-through furnace at around 980 ° C. After cold rolling, recrystallization annealing was carried out in a continuous furnace at around 980 ° C under a bright annealing atmosphere to further improve the forming properties of the cold-rolled strip. In this case too, the test results confirmed the good high-temperature and corrosion properties of the steel to be used according to the invention.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Exhaust Silencers (AREA)
  • Catalysts (AREA)
  • Heat Treatment Of Steel (AREA)
  • Arc Welding In General (AREA)
EP90103396A 1989-04-06 1990-02-22 Verwendung eines hitzebeständigen Stahls für korrosionsbeständige Bauteile Revoked EP0391054B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3911104A DE3911104C1 (US08188275-20120529-C00054.png) 1989-04-06 1989-04-06
DE3911104 1989-04-06

Publications (2)

Publication Number Publication Date
EP0391054A1 EP0391054A1 (de) 1990-10-10
EP0391054B1 true EP0391054B1 (de) 1993-05-05

Family

ID=6377972

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90103396A Revoked EP0391054B1 (de) 1989-04-06 1990-02-22 Verwendung eines hitzebeständigen Stahls für korrosionsbeständige Bauteile

Country Status (3)

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EP (1) EP0391054B1 (US08188275-20120529-C00054.png)
DE (2) DE3911104C1 (US08188275-20120529-C00054.png)
ES (1) ES2041454T3 (US08188275-20120529-C00054.png)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69330590T2 (de) * 1992-04-09 2002-06-13 Nippon Steel Corp., Tokio/Tokyo Ferritischer rostfreier stahl mit exzellentem hochtemperatur widerstand und hochtemperaturwiderstand gegen salzangriff
DE4421874C1 (de) * 1994-06-23 1995-05-24 Daimler Benz Ag Stahlblechgehäuse für eine Abgasanlage einer Brennkraftmaschine
FR2744137B1 (fr) * 1996-01-25 1998-04-24 Ecia Equip Composants Ind Auto Utilisation d'un acier inoxydable ferritique pour la fabrication par hydroformage d'un soufflet deformable elastiquement et soufflet obtenu
FR2798394B1 (fr) 1999-09-09 2001-10-26 Ugine Sa Acier ferritique a 14% de chrome stabilise au niobium et son utilisation dans le domaine de l'automobile

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3139358A (en) * 1961-06-14 1964-06-30 Allegheny Ludlum Steel Method of preventing ribbing and roping
FR2192185A1 (en) * 1972-07-07 1974-02-08 Nippon Steel Corp Weldable heat-resistant alloy steels - resisting automobile waste gases, and contg aluminium, chromium, titanium, opt zirconium
JPS5360814A (en) * 1976-11-12 1978-05-31 Sumitomo Metal Ind Ltd Heat resisting ferritic stainless steel with excellent weldability
US4261739A (en) * 1979-08-06 1981-04-14 Armco Inc. Ferritic steel alloy with improved high temperature properties
FR2589482B1 (fr) * 1985-11-05 1987-11-27 Ugine Gueugnon Sa Tole ou bande en acier ferritique inoxydable, en particulier pour systemes d'echappement
US4834808A (en) * 1987-09-08 1989-05-30 Allegheny Ludlum Corporation Producing a weldable, ferritic stainless steel strip

Also Published As

Publication number Publication date
DE59001337D1 (de) 1993-06-09
EP0391054A1 (de) 1990-10-10
DE3911104C1 (US08188275-20120529-C00054.png) 1990-11-29
ES2041454T3 (es) 1993-11-16

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