EP0361554B1 - Verwendung von ferritischen Chrom-Molybdän-Stählen als gegen konzentrierte Schwefelsäure beständigem Werkstoff - Google Patents

Verwendung von ferritischen Chrom-Molybdän-Stählen als gegen konzentrierte Schwefelsäure beständigem Werkstoff Download PDF

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Publication number
EP0361554B1
EP0361554B1 EP89202071A EP89202071A EP0361554B1 EP 0361554 B1 EP0361554 B1 EP 0361554B1 EP 89202071 A EP89202071 A EP 89202071A EP 89202071 A EP89202071 A EP 89202071A EP 0361554 B1 EP0361554 B1 EP 0361554B1
Authority
EP
European Patent Office
Prior art keywords
sulfuric acid
molybdenum
chromium
carbon
concentrated sulfuric
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.)
Revoked
Application number
EP89202071A
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German (de)
English (en)
French (fr)
Other versions
EP0361554A1 (de
Inventor
Karl-Heinz Dörr
Hermann Müller
Ulrich Dr. Sander
Wolfram Schalk
Ernst Dr. Wallis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GEA Group AG
Original Assignee
Metallgesellschaft AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Application filed by Metallgesellschaft AG filed Critical Metallgesellschaft AG
Publication of EP0361554A1 publication Critical patent/EP0361554A1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/082—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum

Definitions

  • the invention relates to the use of a ferritic chromium-molybdenum steel with good corrosion resistance to concentrated sulfuric acid.
  • Sulfuric acid is generally produced by catalytic conversion of the SO2 content of gases to SO3 and - in the case of dry gases - subsequent absorption of the SO3 formed in concentrated sulfuric acid or - in the case of moist gases - subsequent condensation of the sulfuric acid formed.
  • DE-C-21 54 126 discloses the use of an austenitic nickel alloy containing chromium, molybdenum, cobalt, manganese, copper and silicon for acid concentrations of 65% and more. Because of its difficult deformability, this alloy is limited to use as shafts, bearings, pumps, valve components and the like elements.
  • DE-A-33 20 527 discloses the use of austenitic steels with a silicon content of 4.6-5.8%. The processability and the production of this material is difficult.
  • EP-B-0 130 967 describes four materials for use in sulfuric acid from 98 to 101% and a temperature of more than 120 ° C. The best corrosion properties are found in the ferritic alloy Alloy 26-1 (material no. 1.4131, XlCrMo261), the maximum nickel content of which is 0.5%. However, this material causes processing difficulties and its resistance to corrosion decreases sharply as the concentration of sulfuric acid decreases.
  • ferritic material 29-4-2 is mentioned as the next best material for use in sulfuric acid of 98-101%.
  • This material contains 28-30% Cr, 3.50-4.20% Mo and 2.00-2.50 Ni. This material also causes considerable difficulties in processing and its corrosion resistance decreases sharply as the concentration of sulfuric acid decreases.
  • EP-B-0 200 862 discloses the use of a molybdenum-free, chromium-containing alloy for use in sulfuric acid above 96% and temperatures up to 350 ° C., it being irrelevant whether it is ferritic or ferritic -austenitic or austenitic structure is present. This material does not have sufficient corrosion resistance, especially in the austenitic and austenitic-ferritic structure and in the case of sulfuric acids with a lower concentration.
  • the invention has for its object to provide a material which has a high corrosion resistance even in lower sulfuric acid concentrations, has good kneading properties and thus processing properties, and which can be produced inexpensively.
  • ferritic chromium-molybdenum steels 26 to 30% chrome 1.8 to 3.0% molybdenum 3.0 to 4.5% nickel carbon ⁇ 0.02% silicon ⁇ 1.00% manganese ⁇ 1.00% sulfur ⁇ 0.015% Carbon + nitrogen ⁇ 0.045% niobium ⁇ 12 x% C ⁇ 1.2% Remainder iron as well as impurities due to melting technology
  • Remainder iron As a corrosion-resistant material for the manufacture of structural parts that are resistant to sulfuric acid at a concentration equal to or greater than 94% by weight with a temperature below the boiling point.
  • Contamination-related impurities can e.g. its phosphorus, aluminum, vanadium, titanium, tantalum, calcium, magnesium, cerium, boron.
  • the material has good forming properties and is very well suited for the production of structural parts from sheet metal or strips, e.g. Heat exchangers, pipes, pump systems, sprinkler systems, absorbers, etc.
  • the material is also corrosion-resistant to cold sulfuric acid.
  • a preferred embodiment consists in the use of a ferritic chromium-molybdenum steel 27 to 29% chrome 2.0 to 3.0% molybdenum 3.0 to 4.5% nickel carbon ⁇ 0.02% Carbon + nitrogen ⁇ 0.045% (Niobium + zircon) ⁇ 10 x% (carbon + nitrogen) Remainder iron as well as impurities due to melting technology
  • This steel shows particularly good corrosion properties.
  • Table I shows the corrosion behavior of the material according to the invention at different temperatures and sulfuric acid concentrations.
  • the corrosion behavior was determined by immersion tests. The test duration was 25 days in all cases. The removal rates were determined by gravimetric differential weighing and conversion to mm / a. The test medium was renewed after each test cycle.
  • the material contained 28% Cr, 2% Mo and 4% Ni.
  • the removal rates in sulfuric acid with a concentration of 95% by weight were: at 100 ° C 0.06 mm / a at 125 ° C 0.05 mm / a at 150 ° C 0.32 mm / a
  • the advantages of the use of the material according to the invention are that the tendency to precipitate brittle, intermetallic phases is relatively low for the molybdenum.
  • the nickel content increases the elimination inertia relatively strongly and narrows the heterogeneous areas in the thermodynamic equilibrium. The combination of these two effects leads to a higher structural stability during welding and during heat treatment processes. This results in good corrosion resistance and ductility in the form of impact strength.
  • the material can be welded up to a thickness of 50 mm, while the material 29-4-2 can only be welded up to about 2 mm.
  • the material according to the invention therefore has very good processability with very good corrosion resistance.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Catalysts (AREA)
  • Heat Treatment Of Articles (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
EP89202071A 1988-09-07 1989-08-10 Verwendung von ferritischen Chrom-Molybdän-Stählen als gegen konzentrierte Schwefelsäure beständigem Werkstoff Revoked EP0361554B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3830365A DE3830365C2 (de) 1988-09-07 1988-09-07 Verwendung von ferritischen Chrom - Molybdän-Stählen als gegen konzentrierte Schwefelsäure beständigem Werkstoff
DE3830365 1988-09-07

Publications (2)

Publication Number Publication Date
EP0361554A1 EP0361554A1 (de) 1990-04-04
EP0361554B1 true EP0361554B1 (de) 1993-06-09

Family

ID=6362436

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89202071A Revoked EP0361554B1 (de) 1988-09-07 1989-08-10 Verwendung von ferritischen Chrom-Molybdän-Stählen als gegen konzentrierte Schwefelsäure beständigem Werkstoff

Country Status (7)

Country Link
US (1) US5030415A (xx)
EP (1) EP0361554B1 (xx)
JP (1) JP3137968B2 (xx)
AU (1) AU615105B2 (xx)
DE (2) DE3830365C2 (xx)
ES (1) ES2040981T3 (xx)
ZA (1) ZA896817B (xx)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5207980A (en) * 1991-10-27 1993-05-04 Westinghouse Electric Corp. Top nozzle-mounted replacement guide pin assemblies
ZA938889B (en) * 1992-12-07 1994-08-01 Mintek Stainless steel composition
DE4342188C2 (de) * 1993-12-10 1998-06-04 Bayer Ag Austenitische Legierungen und deren Verwendung
DE102005008109A1 (de) 2005-02-21 2006-08-24 Outokumpu Technology Oy Verfahren und Anlage zur Herstellung von Schwefelsäure
ES2351281B1 (es) * 2009-02-03 2011-09-28 Valeo Termico, S.A. Intercambiador de calor para gases, en especial de los gases de escape de un motor.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0018131A1 (en) * 1979-04-06 1980-10-29 Kureha Kagaku Kogyo Kabushiki Kaisha Crosslinked, carboxyalkylated and deacetylated derivative of chitin, process for preparation thereof, and use thereof as an adsorbent material

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2091642A5 (en) * 1970-05-16 1972-01-14 Nippon Steel Corp Stainless steel resistant to pitting corrosion -and suitable for comp - used in sewater
AT338854B (de) * 1972-09-04 1977-09-26 Ver Edelstahlwerke Ag Ferritische bzw. ferritisch-austenitische stahllegierungen fur gegenstande, die gegen saure- und wassergemische bis 70grad c korrosionsbestandig sind
FR2324752A1 (fr) * 1975-06-24 1977-04-15 Sandvik Ab Acier inoxydable resistant a l'acide sulfurique concentre
GB1565419A (en) * 1976-04-27 1980-04-23 Crucible Inc Stainless steel welded articles
CA1181569A (en) * 1982-06-11 1985-01-29 Frank Smith Apparatus and process
DE3508532A1 (de) * 1985-03-09 1986-09-18 Bayer Ag, 5090 Leverkusen Verwendung einer chromhaltigen legierung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0018131A1 (en) * 1979-04-06 1980-10-29 Kureha Kagaku Kogyo Kabushiki Kaisha Crosslinked, carboxyalkylated and deacetylated derivative of chitin, process for preparation thereof, and use thereof as an adsorbent material

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
STAHL UND EISEN, 1990; Seite 73# *
STAHLSCHLÜSSEL, 1985; Seite 344, Nr. 41# *
STAHLSCHLÜSSEL, 1992; Seite 292, Nr. 1.4575# *

Also Published As

Publication number Publication date
DE3830365C2 (de) 1996-06-27
DE58904618D1 (de) 1993-07-15
EP0361554A1 (de) 1990-04-04
AU615105B2 (en) 1991-09-19
ES2040981T3 (es) 1993-11-01
DE3830365A1 (de) 1990-03-15
AU4107389A (en) 1990-03-15
US5030415A (en) 1991-07-09
JP3137968B2 (ja) 2001-02-26
JPH02107745A (ja) 1990-04-19
ZA896817B (en) 1991-05-29

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