GB2251628A - Heat exchangers and alloys for use in their manufacture - Google Patents

Heat exchangers and alloys for use in their manufacture Download PDF

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Publication number
GB2251628A
GB2251628A GB9200187A GB9200187A GB2251628A GB 2251628 A GB2251628 A GB 2251628A GB 9200187 A GB9200187 A GB 9200187A GB 9200187 A GB9200187 A GB 9200187A GB 2251628 A GB2251628 A GB 2251628A
Authority
GB
United Kingdom
Prior art keywords
alloy
heat
chromium
boron
iron
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.)
Granted
Application number
GB9200187A
Other versions
GB9200187D0 (en
GB2251628B (en
Inventor
Peter Frank Walter
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.)
Wall Colmonoy Corp
Original Assignee
Wall Colmonoy Corp
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
Application filed by Wall Colmonoy Corp filed Critical Wall Colmonoy Corp
Publication of GB9200187D0 publication Critical patent/GB9200187D0/en
Publication of GB2251628A publication Critical patent/GB2251628A/en
Application granted granted Critical
Publication of GB2251628B publication Critical patent/GB2251628B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
    • C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3033—Ni as the principal constituent
    • B23K35/304—Ni as the principal constituent with Cr as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
    • C22C19/056—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 10% but less than 20%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/058—Alloys based on nickel or cobalt based on nickel with chromium without Mo and W

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Catalysts (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

An alloy has the following composition in weight percentages: Chromium 20 to 33, Silicon 2 to 6, Boron 2 to 6, Iron 0 to 20, Carbon 0 to 1.5, Tungsten 0 to 5, with Nickel making up the balance to 100. Such an alloy is used to braze together the metal parts of a heat exchanger, e.g. one of a type suitable for a community heating scheme, or of other extended area devices, such as fluid heaters and catalyst carriers.

Description

HEAT EXCHANGERS AND ALLOYS FOR USE IN THEIR MANUFACTURE This invention relates to heat exchangers and other extended area devices, such as fluid heaters and catalyst carriers, and to alloys for use in their manufacture.
Heat exchangers are used for community heating schemes, in which the surplus heat from power stations is used to heat domestic and building premises. Such heat exchangers are very much subject to corrosion from the water that flows through them and alloys previously used for brazing the metal parts of such heat exchangers together have not hitherto been sufficiently resistant to such corrosion.
The present invention springs from the unexpected discovery that a particular high-chromium alloy can be successfully used for such brazing, the said alloy having an especially good resistance to corrosion, so that the heat-exchangers have a much longer life. Apart from community heating schemes, the heat exchangers can be used in processing milk and other potable liquids, and in chemical engineering generally. Furthermore, other extended area devices, such as fluid heaters and catalyst carriers, can usefully be made using the said alloy for brazing their components together.
The composition of this alloy falls within the following range of percentages, the percentages being by weight: Chromium 20 to 33, preferably 26 to 30 and particularly 28, Silicon 2 to 6, preferably 3.75 to 4.5 and particularly 4.1, Boron 2 to 6, preferably 3.1 to 3.75 and particularly 3.4, Iron 0 to 20, preferably 0.5 to 1 if present and particularly 0.75, Carbon 0 to 1.5, preferably 1.15 to 1.35 if present and particularly 1.2, and Tungsten 0 to 5, preferably 1 to 5 if present and particularly 1.5 to 2.5, with Nickel making up the balance to 100.
Known high-temperature brazing alloys contain only up to about 15 to 19.5% of chromium , contrasting with the above alloy. These, such as HTN5 (NK8) and the cobalt-based alloy HTN12 (NK13) (see BS 1845:1984 Table 6), are physically much weaker than the alloy disclosed above.
In accordance with the present invention, an alloy having the above composition is used to braze together the metal parts of a heat exchanger, especially one suitable for use in a community heating scheme, or another extended area device.
The present invention also provides heat exchangers and other extended area devices made by using such an alloy to braze the metal parts of the heat exchanger together.

Claims (9)

1. A method of manufacturing a heat-exchanger characterised in that an alloy having the following composition in weight percentages: Chromium 20 to 33 Silicon 2 to 6 Boron 2 to 6 Iron O to 20 Carbon 0 to 1.5 Tungsten 0 to 5 with Nickel making up the balance to 100 is used to braze together the metal parts of the heat exchanger.
2. A method as claimed in Claim 1 characterised in that the percentages in the composition of the alloy are Chromium 26 to 30, Silicon 3.75 to 4.5, Boron 3.1 to 3.75, Iron 0.5 to 1, Carbon 1.15 to 1.35 and Tungsten 1 to 5, balance nickel.
3. A method as claimed in Claim 1 characterised in that the percentages in the composition of the alloy are Chromium 26 to 30, Silicon 3.75 to 4.5, Boron 3.1 to 3.75, Iron 0.5 to 1, Carbon 1.15 to 1.35, balance nickel.
4. A method as claimed in Claim 1 characterised in that the percentages in the composition of the alloy are Chromium 28, Silicon 4.1, Boron 3.4, Iron 0.75, Carbon 1.2 and Tungsten 1.5 to 2.5, balance nickel.
5. A method of manufacturing a metallic extended-area device other than a heat-exchanger, characterised in that an alloy as defined in any one of claims 1 to 4 is used to braze together the metal parts of the device.
6. A method as claimed in Claim 5 in which the device is a fluid heater or a catalyst carrier.
7. Heat-exchangers made by a method as claimed in any one of Claims 1 to 4.
8. Heat exchangers as claimed in claim 7 of a type suitable for use in a community heating scheme.
9. Extended-area devices made by a method as claimed in any one of Claims 1 to 6.
GB9200187A 1991-01-09 1992-01-07 Heat exchangers and other extended area devices and methods for the manufacture thereof Expired - Fee Related GB2251628B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB919100372A GB9100372D0 (en) 1991-01-09 1991-01-09 Heat exchangers and alloys for use in their manufacture

Publications (3)

Publication Number Publication Date
GB9200187D0 GB9200187D0 (en) 1992-02-26
GB2251628A true GB2251628A (en) 1992-07-15
GB2251628B GB2251628B (en) 1994-03-16

Family

ID=10688129

Family Applications (2)

Application Number Title Priority Date Filing Date
GB919100372A Pending GB9100372D0 (en) 1991-01-09 1991-01-09 Heat exchangers and alloys for use in their manufacture
GB9200187A Expired - Fee Related GB2251628B (en) 1991-01-09 1992-01-07 Heat exchangers and other extended area devices and methods for the manufacture thereof

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB919100372A Pending GB9100372D0 (en) 1991-01-09 1991-01-09 Heat exchangers and alloys for use in their manufacture

Country Status (2)

Country Link
GB (2) GB9100372D0 (en)
SE (1) SE9200032L (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6257483B1 (en) * 1997-10-09 2001-07-10 Calsonic Corporation Nickel-based brazing material, method of brazing with the brazing material, process for producing EGR cooler with the brazing material, and EGR cooler
EP1944563A1 (en) * 2007-01-12 2008-07-16 Innospin AG Heat exchanger tube and method for the production thereof
US11022077B2 (en) 2019-08-13 2021-06-01 Caterpillar Inc. EGR cooler with Inconel diffuser

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105499834A (en) * 2016-01-27 2016-04-20 江苏科技大学 Brazing material for brazing molybdenum-rhenium alloy, preparation method and brazing method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6257483B1 (en) * 1997-10-09 2001-07-10 Calsonic Corporation Nickel-based brazing material, method of brazing with the brazing material, process for producing EGR cooler with the brazing material, and EGR cooler
EP1944563A1 (en) * 2007-01-12 2008-07-16 Innospin AG Heat exchanger tube and method for the production thereof
US11022077B2 (en) 2019-08-13 2021-06-01 Caterpillar Inc. EGR cooler with Inconel diffuser

Also Published As

Publication number Publication date
GB9200187D0 (en) 1992-02-26
SE9200032L (en) 1992-07-10
SE9200032D0 (en) 1992-01-08
GB9100372D0 (en) 1991-02-20
GB2251628B (en) 1994-03-16

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20000107