C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 21/00 (2006.01) C21D 8/02 (2006.01) C21D 9/52 (2006.01) C22C 21/02 (2006.01) C22F 1/04 (2006.01)
Patent
CA 2607784
The present invention provides a method for producing AIMn strip or sheet for making components by brazing, as well as the products obtained by said method. In particular this method is related to fin materials used in heat exchangers. The fins can be delivered with or without a cladding depending on application. Rolling slabs are produced from a melt which contains 0.3-1.5% Si, <=0.5% Fe, <=0.3% Cu, 1.0-2.0% Mn, <=0.5% Mg, <=4.0% Zn, <=0.3% each of elements from group IVb, Vb, or VIb elements, and unavoidable impurity elements, as well as aluminium as the remainder in which the rolling slabs prior to hot rolling are preheated at a preheating temperature of less than 550°C, preferably between 400 and 520°C, more preferably between 450 and 520°C to control the number and size of dispersoid particles, and the preheated rolling slab is hot rolled into a hot strip. The strip is thereafter cold rolled into a strip with a total reduction of at least 90%, and the cold rolled strip is heat treated to obtain a 0.2% proof stress value that is 50 - 90% of its proof stress value in the as cold rolled condition to a proof stress value in the range between 100 and 200 MPa. The strip may alternatively be produced by twin- roll strip casting. The composition of the melt tailors the microstructure development during the complete processing to give the desired post braze properties and performance during brazing in combination with adequate delivery properties of the strip. In particular the high post braze strength combined with a good sagging resistance and low susceptibility to liquid core penetration during brazing, as well as a relatively good formability in the delivery condition prior to fin forming.
Ekstroem Hans-Erik
Oskarsson Anders
Tangen Stian
Westergard Richard
Marks & Clerk
Sapa Heat Transfer Ab
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