Aluminum alloy sheet for cross fin and production thereof

Details Aluminum alloy sheet for cross fin and production thereof Aluminum alloy sheet for cross fin and production thereof

1998-04-09

2000-08-22

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

With casting or solidifying from melt

148437, 148552, 420548, 420550, C22C 2100, C22F 104

Patent

active

061066419

ABSTRACT:
A continuous-cast and cold-rolled aluminum alloy sheet for a cross fin, characterized by a chemical composition consisting of not less than 0.05 wt % and less than 0.30 wt % Fe, more than 0.03 wt % and less than 0.10 wt % Mn, an amount of a grain refining agent, and the balance of Al and unavoidable impurities including less than 0.15 wt % Si; a microstructure substantially composed of subgrains; and an electrical conductivity of 55% IACS or more. The aluminum alloy sheet is advantageously produced by a process including the steps of continuous-casting an aluminum alloy melt having the above-mentioned chemical composition to form a cast sheet having a sheet thickness of not more than 30 mm; cold-rolling the cast sheet at a reduction of 90% or more, followed by a temper annealing at a temperature of from 250 to 300.degree. C. for a holding time of 2 hours or more. The present inventive aluminum alloy sheet has a high formability such that a cross fin having a large fin pitch applicable to any type of heat media pipe having various sizes can be successfully formed by a simplified production process which is easy to manage and also reduces the production cost, and by using less viscous volatile lubricants causing no substantial environmental pollution.

REFERENCES:
patent: 5554234 (1996-09-01), Takeuchi et al.

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