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Heat transfer tube and method for producing same

A heat transfer tube and aluminum alloy technology, which is applied in the field of heat transfer tubes for heat exchangers and their preparation, can solve the problems of coolant leakage strength and reduction, and achieve the effect of excellent corrosion resistance.

Inactive Publication Date: 2017-12-01
MITSUBISHI ALUMINUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, corrosion occurs on the heat transfer tube to cause pitting corrosion, which may cause coolant leakage or decrease in strength.

Method used

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  • Heat transfer tube and method for producing same
  • Heat transfer tube and method for producing same
  • Heat transfer tube and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0101] After homogenizing the ingot of aluminum alloy having the composition shown in Table 1, extrusion processing was performed to prepare a flat extruded tube having a width of 22 mm, a height (thickness) of 1.2 mm, and 29 holes.

[0102] In the case of performing homogenization treatment on an aluminum alloy ingot, as shown in Table 2 below, the heating rate between room temperature and 450°C is adjusted, the heating rate between 450°C and the homogenization treatment temperature is adjusted, and the homogenization treatment temperature and Homogenization treatment time, adjust the cooling rate between the homogenization treatment temperature and 200°C, and use the aluminum alloy obtained under various conditions to prepare flat extruded tubes as test samples.

Embodiment 3

[0104] Example 3 Coating KZnF on the surface and back of a flat extruded tube 3 Powder (D(50) particle size 2.0μm: 10g / m 2 ).

[0105] In Examples 4 and 5, the solder composition was coated on the surface and the back of the flat extruded tube.

Embodiment 4

[0106] The solder composition of embodiment 4 uses Si powder (D (50) grain size 4 μm: 3g / m 2 ) and KZnF 3 Powder (D(50) particle size 2.0μm: 10g / m 2 ) of mixture A.

[0107] In addition, Example 5 uses Si powder (D(50) particle size 4μm: 3g / m 2 ), KZnF 3 Powder (D(50) particle size 2.0μm: 10g / m 2 ) and NOCOLOK flux (ノコロックフラックス) (trade name of Alcan Inc.) (K 3 AlF 3 +KAIF 4 : 10g / m 2 ) of mixture B.

[0108] As described above, a heat transfer tube formed by coating a Zn-containing layer on a flat extruded tube was placed as a test body in a nitrogen atmosphere furnace, and heated while maintaining the temperature shown in Table 2 below for 3 minutes. deal with. By this heat treatment, a sacrificial anode layer is formed on the surface of the heat transfer tube.

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Abstract

The invention relates to heat transfer tube. The heat transfer tube includes: a tube body made of an extruded material of an aluminum alloy having a composition including: 0.3 mass% or more and less than 0.8 mass% of Mn; more than 0.1 mass% and less than 0.32 mass% of Si; 0.3 mass% or less of Fe; 0.06 mass% or more and 0.3 mass% or less of Ti; and Al balance including inevitable impurities, a ratio of a Mn content to a Si content, Mn% / Si%, exceeding 2.5; and a Zn-containing layer provided to an outer surface of the tube body.

Description

[0001] This application is a divisional application of an invention patent application with an application date of March 25, 2013, an application number of 201380027306.X, and an invention title of “Heat Transfer Tube and Its Preparation Method”. technical field [0002] The present invention relates to a heat transfer tube for a heat exchanger configured to be excellent in corrosion resistance and a method for producing the same. [0003] This application claims priority based on Japanese Patent Application No. 2012-072302 for which it applied in Japan on March 27, 2012, and uses the content here. Background technique [0004] The heat exchanger made of aluminum alloy is prepared by welding with heat transfer tubes, fins and headers as the main components. In the production process of aluminum alloy heat exchangers, brazing sheets coated with Al—Si alloy solder are widely used at present. However, in recent years, Al-Si alloy powder and Si powder have been made into fluxes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/19B23K1/20B23K35/363B23K101/14B23K103/10C22C21/00C22F1/04C23C10/28C23C30/00
CPCB23K1/0012B23K1/012B23K1/19B23K1/203B23K35/0222B23K35/0244B23K35/0255B23K35/0266B23K35/0272B23K35/28B23K35/282B23K35/362B23K35/365B23K2101/14B23K2101/34B23K2103/10C22C21/00C22F1/04C23C10/28C23C30/00F28D1/05366F28F9/18F28F19/06F28F21/084F28F21/089F28F2275/045B32B15/016B32B15/20F28F1/30
Inventor 古村裕树兵库靖宪
Owner MITSUBISHI ALUMINUM CO LTD