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
  • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/12—All metal or with adjacent metals
  • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
  • Y10T428/12639—Adjacent, identical composition, components
  • Y10T428/12646—Group VIII or IB metal-base
  • Y10T428/12653—Fe, containing 0.01-1.7% carbon [i.e., steel]

Definitions

• ABSTRACT Tubes and vessels intended for use in handling or housing hot water are formed by welding together sheets of stainless chromium steel having high corrosion resistance, good workability and completely stabilized structure.
• the present invention shows the way and proposes the means for rendering it possible to manufacture heat exchangers and the like as described above also of chromium steel and to meet the requirement of a longest possible service life.
• a heat exchanger or the like referred to above is made of sheet metal, of a material having the general chemical composition as follows:
• Chromium steel with low carbon and nitrogen contents which improves the working properties.
• the material is stabilized with titanium, which improves the corrosion resistance.
• the chromium steel further includes molybdenum, which in combination with the low carbon and nitrogen contents eliminates the disadvantages of conventional chromium steels, such as brittleness and corrosion.
• Welded installations in contact with hot or warm water according to above, for example water heaters or heat exchangers, according to the invention are characterized in that they consist of sheets of chromium steel having the analysis as follows:
• a heat exchanger of usual construction was manufactured by welding cold-rolled sheets of 2 mm thickness with the steel analysis as follows: Carbon 0.028 nitrogen 0.025 chromium 18.95 nickel 0.35 copper 0.06 silicon 0.5 manganese 0.48 and molybdenum 2.44 and titanium 0.64
• An article comprising at least one welded sheet of stainless chromium steel consisting essentially of C not more than 0.03%
• the balance being iron and incidential impurities, percentages being by weight.
• alloy steel composition includes also a significant amount of a carbonand nitrogen-binding stabilizing element selected from the group consisting of niobium, tantalum, aluminum and zirconium.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Materials Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Thermal Sciences (AREA)
• Physics & Mathematics (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Details Of Fluid Heaters (AREA)
• Arc Welding In General (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
• Heat Treatment Of Articles (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=6629636

Family Applications (1)

Country Status (9)

Cited By (16)

Families Citing this family (11)

Citations (7)

Family Cites Families (1)

• 1973
  • 1973-04-12 US US350655A patent/US3890143A/en not_active Expired - Lifetime
  • 1973-04-12 DK DK198873A patent/DK143202C/da active
  • 1973-04-12 AT AT324373A patent/AT341561B/de not_active IP Right Cessation
  • 1973-04-12 NO NO1522/73A patent/NO134341C/no unknown
  • 1973-04-13 FR FR7313583A patent/FR2180117B1/fr not_active Expired
  • 1973-04-13 CH CH536573A patent/CH601763A5/xx not_active IP Right Cessation
  • 1973-04-14 JP JP48042623A patent/JPS4947211A/ja active Pending
  • 1973-04-16 GB GB1828473A patent/GB1383164A/en not_active Expired
  • 1973-04-16 CA CA168,866A patent/CA1007899A/en not_active Expired

Patent Citations (7)

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