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Aluminium-clad steel strip for coolers and preparation method thereof as well as steel strip and aluminium alloy strip used thereby

A technology of aluminum-coated steel strips and aluminum alloy strips, applied in chemical instruments and methods, manufacturing tools, welding equipment, etc., can solve problems such as inclusions in composite layers, inability to apply brazing technology, formation, etc., and achieve excellent mechanical performance indicators Effect

Inactive Publication Date: 2011-04-20
HARBIN SONGRUN METAL PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problems of pinholes, inclusions in composite layers, formation of brittle iron-aluminum metal compounds, and unsuitability for brazing technology in the steel-aluminum composite materials produced in industrialized production at present, and provides an aluminum-coated steel strip for coolers. Its preparation method and its used steel strip and aluminum alloy strip

Method used

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  • Aluminium-clad steel strip for coolers and preparation method thereof as well as steel strip and aluminium alloy strip used thereby
  • Aluminium-clad steel strip for coolers and preparation method thereof as well as steel strip and aluminium alloy strip used thereby
  • Aluminium-clad steel strip for coolers and preparation method thereof as well as steel strip and aluminium alloy strip used thereby

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specific Embodiment approach 1

[0013] Specific implementation mode one: combine figure 1 with figure 2 Illustrate this embodiment, the aluminum clad steel strip of this embodiment cooler is made of steel strip 1 and aluminum alloy strip 2 cladding; The content of C in the described steel strip is less than 0.01% (weight), the content of Si is less than 0.01% (weight) ), the content of Mn is 0.20% to 0.30% (weight) and the content of Alt is less than 0.005% (weight); the content of Si in the aluminum alloy strip is 0.70% to 0.90% (weight) and the content of Fe is 0.30% ~0.45% by weight.

[0014] In this embodiment, the main component of the steel strip is iron, and the main component of the aluminum alloy strip is aluminum.

[0015] The aluminum-clad steel strip for the cooler of this embodiment is tested, and the yield strength (Y.S) of the aluminum-clad steel strip for the cooler of this embodiment is ≥ 260MPa, the tensile strength (T.S) is 330-380MPa, and the elongation (EL)> 30% , and repeated bendin...

specific Embodiment approach 2

[0017] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the content of C in the described steel strip is 0.005% (weight), the content of Si is 0.005% (weight), and the content of Mn is 0.25% ( weight) and the content of Alt is 0.003% (weight); the content of Si in the aluminum alloy strip is 0.80% (weight) and the content of Fe is 0.40% (weight). Others are the same as the first embodiment.

specific Embodiment approach 3

[0018] Specific embodiment three: the difference between this embodiment and specific embodiment one is: the steel strip is composed of 0.005% C, 0.005% Si, 0.25% Mn, 0.003% Alt and the iron of the balance by weight percentage Composition: The aluminum alloy strip is composed of 0.80% Si, 0.40% Fe and the rest Al in weight percentage. Others are the same as the first embodiment.

[0019] Figure 4 It is the two-dimensional phase analysis diagram of the X-ray diffraction micro-region of the steel-aluminum interface after brazing the fins of the cooler with an aluminum-clad steel strip for the cooler of this embodiment. The analysis result shows that there is no obvious metal transition layer between the steel and aluminum, and the interface Intermetallic compounds were also not formed.

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Abstract

The invention relates to an aluminium-clad steel strip and a preparation method thereof as well as a steel strip and an aluminium alloy strip used thereby, in particular to an aluminium-clad steel strip for coolers and a preparation method thereof as well as a steel strip and an aluminium alloy strip used thereby. The invention solves the problems of pinholes, composite layer inclusions, generation of brittle iron aluminium metallic compounds and failure to adapt to brazing technology in the industrially produced steel-aluminium composite material at present. The aluminium-clad steel strip for coolers is prepared by cladding a steel strip and an aluminium alloy strip. The preparation method comprises the following steps: 1. pretreating the surfaces of the steel strip and the aluminium alloy strip; 2. sandwich-rolling; and 3. recrystallization annealing. In the steel strip, the content of C is less than 0.01%, the content of Si is less than 0.01%, the content of Mn is 0.20-0.30%, and the content of Alt is less than 0.005%. In the aluminium alloy strip, the content of Si is 0.70-0.90%, and the content of Fe is 0.30-0.45%. The invention is applicable to the field of brazing coolers.

Description

technical field [0001] The invention relates to an aluminum-coated steel strip, a preparation method thereof, and a steel strip and an aluminum alloy strip used therein. Background technique [0002] At present, the process methods of aluminum-coated steel strips for industrial production include hot dipping of steel strips, thermal spraying, explosive rolling, cold rolling, etc. All of the above methods have pinholes, composite layer inclusions, and brittle iron-aluminum metals to varying degrees. More importantly, the aluminum-clad steel strip produced by the above method will generate intermetallic compounds at the steel-aluminum interface during brazing, resulting in delamination of aluminum and steel, so it cannot be applied to brazing technology. Contents of the invention [0003] The present invention aims to solve the problems of pinholes, inclusions in composite layers, formation of brittle iron-aluminum metal compounds, and unsuitability for brazing technology in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/01B32B37/10B23K20/04C22C38/04C22C21/02
Inventor 李晶华贾和利王平
Owner HARBIN SONGRUN METAL PRODS
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