DK143202B - WELDED CONSTRUCTIONS LIKE HEAT EXCHANGERS - Google Patents

WELDED CONSTRUCTIONS LIKE HEAT EXCHANGERS Download PDF

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Publication number
DK143202B
DK143202B DK198873AA DK198873A DK143202B DK 143202 B DK143202 B DK 143202B DK 198873A A DK198873A A DK 198873AA DK 198873 A DK198873 A DK 198873A DK 143202 B DK143202 B DK 143202B
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DK
Denmark
Prior art keywords
heat exchangers
hot water
steel
welded constructions
chromium
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Application number
DK198873AA
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Danish (da)
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DK143202C (en
Inventor
E Skoglund
O Jarleborg
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Nyby Bruk Ab
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Publication date
Application filed by Nyby Bruk Ab filed Critical Nyby Bruk Ab
Publication of DK143202B publication Critical patent/DK143202B/en
Application granted granted Critical
Publication of DK143202C publication Critical patent/DK143202C/en

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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
    • C22C38/22—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]

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  • 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 Treatment Of Articles (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Description

Qrb (11) FREMLÆGGELSESSKRIFT 1^3202 DANMARK (51) lnt C|3 c 22 c 38/22 • (21) Ansøgning nr. 1988/73 (22) indleveret den 12. 3.QF. 1973 (24) Løbedag 12. apr. 1973 (44) Ansøgningen fremlagt ogQrb (11) PUBLICATION NOTICE 1 ^ 3202 DENMARK (51) lnt C | 3 c 22 c 38/22 • (21) Application No. 1988/73 (22) filed on the 12th of QF. 1973 (24) Running day Apr 12 1973 (44) The application presented and

fremlæggelsesskriftet offentliggjort den 20 , jul. 1 98Ithe petition published on 20 July. 1 98I

DIREKTORATET FORDIRECTORATE OF

PATENT- OG VAREMÆRKEVÆSENET <30> prioritet begæret fra denPATENT AND TRADE MARKET <30> priority requested from it

14. apr. 1972, 7214126 u, DEApr 14 1972, 7214126 u, DE

(41) Altn. tllg. 15· okt. 1973 (71) NYBY BRUK AKTIEBOLåG,, S-640 44 Nybybruk, SE.(41) Altn. tllg. 15 · Oct. 1973 (71) NYBY BRUK SHARE COMPANY ,, S-640 44 Nybybruk, SE.

(72) Opfinder: Eric Skoglund* Germundsgatan 54a S-644 00 Torshaella, SE:(72) Inventor: Eric Skoglund * Germundsgatan 54a S-644 00 Torshaella, SE:

Olle Jarleborg, Skolgatan 13 Soederfors, SE.Olle Jarleborg, Skolgatan 13 Soederfors, SE.

i (74) Fuldmægtig under sagens behandling:(74) Plenipotentiary in the proceedings:

Ingeniørfirmaet Giersing & Stellinger.The engineering company Giersing & Stellinger.

(54) Svejsede konstruktioner såsom varmevekslere.(54) Welded structures such as heat exchangers.

Opfindelsen angår svejsede konstruktioner såsom varmevekslere, især varmtvandsvarmere, varmtvandsbeholdere, hedvands- og varmtvandsledninger og lignende, som er fremstillet ved svejsning af plader af rustfrit chromstål, som udviser høj korrosionsbestandighed, god bearbejdelighed og en fuldstændigt stabiliseret struktur, hvilket chromstål indeholder over 17 % Cr, fra 0,3 til 0,6 % Mn, fra 0,3 til 0,6 % Si, mindst 0,2 % Ti og højest 0,5 % Ni.BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to welded structures such as heat exchangers, especially hot water heaters, hot water tanks, hot water and hot water pipes, and the like, produced by welding stainless steel sheets which exhibit high corrosion resistance, good workability and a fully stabilized structure containing more than 17% chromium steel. , from 0.3 to 0.6% Mn, from 0.3 to 0.6% Si, at least 0.2% Ti and at most 0.5% Ni.

Ved konstruktioner, som kommer i berøring med varmt eller hedt vand, såsom varmevekslere, særligt varmtvandsvarmere og varmtvandsbeholdere, samt hed- eller varmtvandsledninger og lignende, spiller korrosionsmodstanden af materialet, som anvendes til konstruktionen, en afgørende rolle for anlæggets levetid. Med henblik herpå er sådanne anlæg blevet fremstillet af kobber, stålplade, som på indersiden er belagt med kobber, af emailleret stålplade, samt af højværdi-rustfrit chrom-nikkel-stål. Som følge af de i reglen nødvendige svejsninger under fremstillingen af eksempelvis beholderne eller ledningerne udløses i de fleste stålsorter strukturelle forløb, som nedsætter modstanden overfor hedt og varmt vand. På grund heraf vælges der enten beskyttelseslag eller særlig høj legeret stabilt stålmateriale.In constructions that come into contact with hot or hot water, such as heat exchangers, especially hot water heaters and hot water tanks, as well as hot or hot water pipes and the like, the corrosion resistance of the material used for the construction plays a crucial role for the life of the plant. To this end, such plants have been made of copper, steel plate, which is coated with copper inside, of enamelled steel plate, and of high-value stainless chromium-nickel steel. As a result of the welds that are usually required during the manufacture of, for example, the containers or wires, in most steel types, structural processes are triggered which reduce the resistance to hot and hot water. Because of this, either protective layers or particularly high alloy stable steel material are selected.

2 143202 I den seneste tid introduceres også varmevekslere på markedet, som består af rent chromstål, hvor der til disse chromstil er tilsat titan for at stabilisere deres struktur, dvs. med henblik på afbinding af carbon og nitrogen, i form af udskillelige faser. Titantilsætning sker enten ifølge støkoiijietriske regler eller i et bestemt forhold til carbon og nitrogen, hvorved det antages, at fuld stabilisering opnås.2 143202 Recently, heat exchangers are also introduced on the market, which consists of pure chromium steel, where titanium has been added to these chromium styles to stabilize their structure, ie. for the decomposition of carbon and nitrogen, in the form of separable phases. Titanium addition takes place either according to the noxious geometric rules or in a specific relationship with carbon and nitrogen, whereby it is assumed that full stabilization is achieved.

Det har vist sig, at disse i og for sig billige chromstål ikke besidder den nødvendige korrosionsmodstand, især på de steder, hvor der udføres svejsninger, dvs. i svejsefugen eller i dennes nærmeste omgivelser.It has been found that these inexpensive chromium steels do not possess the necessary corrosion resistance, especially in the places where welds are carried out, ie. in the weld joint or in its immediate vicinity.

Her forekommer der i de allerfleste tilfælde overordentlig hurtige korrosionsangreb, som herved fører til driftsafbrydelser for anlæggene.Here, in the vast majority of cases, extremely rapid corrosion attacks occur, leading to system shutdowns.

Dette gælder også for en i FR-patentskrift 1 480 166 beskrevet varmtvandsbeholder af rustfrit chromstål, for hvilket der dog ikke er angivet et veldefineret molybdænindhold, et opad begrænset kulstofindhold eller en stabilisering af strukturen.This also applies to a stainless steel hot water tank described in FR patent specification 1 480 166, for which, however, no well-defined molybdenum content, an upwardly limited carbon content or a stabilization of the structure is indicated.

Opfindelsen har til formål at tilvejebringe svejsede konstruktioner af den indledningsvis nævnte art, ved hvilke kravet om maximal levetid er opfyldt.The invention has for its object to provide welded constructions of the kind mentioned above, at which the maximum life expectancy is met.

Ifølge opfindelsen opnås dette ved anvendelse af et chromstål med følgende sammensætning: C højest 0,03 % N højest 0,03 %According to the invention this is achieved by using a chromium steel of the following composition: C maximum 0.03% N maximum 0.03%

Cr 17 - 25 %, fortrinsvis 18,75 - 21,5 %Cr 17 - 25%, preferably 18.75 - 21.5%

Hi højest 0,5 %Hi max 0.5%

Cu højest 0,2 %Cu maximum 0.2%

Si 0,3 - 0,6 %Si 0.3 - 0.6%

Mn 0,3 - 0,6 %Mn 0.3 - 0.6%

Mo 1-4 %, fortrinsvis 1,5 - 3 %Mo 1-4%, preferably 1.5-3%

Ti mindst 0,2 %, fortrinsvis mindst 0,3 %, og resten Fe, bortset fra sædvanlige forureninger, såsom Nb/Ta, Al, Zr og lignende.Ten at least 0.2%, preferably at least 0.3%, and the balance Fe, except for usual contaminants such as Nb / Ta, Al, Zr and the like.

Som et eksempel på varmevekslere ifølge opfindelsen kan anføres følgende:As an example of heat exchangers according to the invention, the following can be stated:

En varmeveksler af sædvanlig konstruktion fremstilles ved svejsning af 2 mm tykke koldvalsede stålplader med følgende kemiske sammensætning af stålet: carbon 0,028 %, nitrogen 0,025 %, chrom 18,95 %, nikkel 0,35 %, kobber 0,06 %, silicium 0,5 %, mangan 0,48 %, molybdæn 2,44 % og titan 0,64 %.A conventional heat exchanger is manufactured by welding 2 mm thick cold rolled steel sheets with the following chemical composition of the steel: carbon 0.028%, nitrogen 0.025%, chromium 18.95%, nickel 0.35%, copper 0.06%, silicon 0, 5%, manganese 0.48%, molybdenum 2.44% and titanium 0.64%.

33

Ui 3 2 O 2Onion 3 2 O 2

Andre varmevekslere og hedvandsledninger kan fremstilles af plader af chromstål med følgende sammensætning: % % % % C 0,029 0,027 0,028 0,028Other heat exchangers and hot water pipes can be made of chromium steel sheets having the following composition:%%%% C 0.029 0.027 0.028 0.028

Si 0,34 0,32 0,38 0,44Si 0.34 0.32 0.38 0.44

Mn 0,48 0,48 0,45 0,38Mn 0.48 0.48 0.45 0.38

Cr 19,2 18,6 21,5 20,20Cr 19.2 18.6 21.5 20.20

Ni 0,31 0,26 0,31 0,19Ni 0.31 0.26 0.31 0.19

Mo 2,24 2,23 2,18 2,98 N 0,019 0,018 0,017 0,015Mo 2.24 2.23 2.18 2.98 N 0.019 0.018 0.017 0.015

Ti 0,64 0,57 0,61 0,66Ti 0.64 0.57 0.61 0.66

Fe resten resten resten restenFairy the rest the rest the rest

Disse varmevekslere og ledninger er lette at bearbejde og at svejse og udviser ingen korrosionsangreb selv efter lang tids drift.These heat exchangers and wires are easy to work and to weld and do not exhibit corrosion attack even after long periods of operation.

DK198873A 1972-04-14 1973-04-12 WELDED CONSTRUCTIONS LIKE HEAT EXCHANGERS DK143202C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE7214126 1972-04-14
DE7214126 1972-04-14

Publications (2)

Publication Number Publication Date
DK143202B true DK143202B (en) 1981-07-20
DK143202C DK143202C (en) 1981-11-23

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ID=6629636

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (9)

Country Link
US (1) US3890143A (en)
JP (1) JPS4947211A (en)
AT (1) AT341561B (en)
CA (1) CA1007899A (en)
CH (1) CH601763A5 (en)
DK (1) DK143202C (en)
FR (1) FR2180117B1 (en)
GB (1) GB1383164A (en)
NO (1) NO134341C (en)

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JPS5188413A (en) * 1975-02-01 1976-08-03 Kotaishokuseifueraitosutenresuko
US4010049A (en) * 1975-10-06 1977-03-01 Jones & Laughlin Steel Corporation Columbium-stabilized high chromium ferritic stainless steels containing zirconium
AT360061B (en) * 1976-01-13 1980-12-29 Graenges Nyby Ab METHOD FOR PRODUCING STABILIZED, FERRITIC, STAINLESS STEEL CHROME STEELS
US4055416A (en) * 1976-01-21 1977-10-25 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Tantalum modified ferritic iron base alloys
DE2701329C2 (en) * 1977-01-14 1983-03-24 Thyssen Edelstahlwerke AG, 4000 Düsseldorf Corrosion-resistant ferritic chrome-molybdenum-nickel steel
US4159034A (en) * 1977-05-12 1979-06-26 Modine Manufacturing Company Weldment heat exchanger
DE2967326D1 (en) * 1979-06-08 1985-01-24 Henrik Giflo High-strength stainless steel, well suited for polishing and resistant to acids
US4294613A (en) 1979-07-03 1981-10-13 Henrik Giflo Acid resistant, high-strength steel suitable for polishing
US4286986A (en) * 1979-08-01 1981-09-01 Allegheny Ludlum Steel Corporation Ferritic stainless steel and processing therefor
US4261739A (en) * 1979-08-06 1981-04-14 Armco Inc. Ferritic steel alloy with improved high temperature properties
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JPS56123356A (en) * 1980-03-01 1981-09-28 Nippon Steel Corp Ferritic stainless steel with superior formability
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US5460755A (en) * 1993-06-23 1995-10-24 T. C. Watermeyer Group, Inc. Packing elements, a pack, a method of constructing a pack, and a method for installing a packing in an evaporative cooler
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US6941064B2 (en) * 2001-04-05 2005-09-06 Sherwood-Templeton Coal Company, Inc. Heater for vacuum cleaners
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CN104858616A (en) * 2014-02-26 2015-08-26 鞍钢股份有限公司 Manufacturing method of A4Cr5MoSiV1 high-alloy core rod

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Also Published As

Publication number Publication date
GB1383164A (en) 1975-02-05
FR2180117A1 (en) 1973-11-23
CA1007899A (en) 1977-04-05
US3890143A (en) 1975-06-17
NO134341B (en) 1976-06-14
DK143202C (en) 1981-11-23
CH601763A5 (en) 1978-07-14
AT341561B (en) 1978-02-10
NO134341C (en) 1976-09-22
ATA324373A (en) 1977-06-15
JPS4947211A (en) 1974-05-07
FR2180117B1 (en) 1976-05-07

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