| 摘要 |
The strip or band is made of an alloy comprising (in wt.%): 0.15-0.30 Si; 0.25 Fe; 0.2-1.1 Cu; 1.0-1.4 Mn; Mg 0.4 Zn 0.2; Ti 0.1; other elements 0.05 each and 0.15 in total; and aluminum the remainder; and where Fe ≤ Si and Cu+Mg 0.4. The strip or band can be plated on one or both surfaces with an aluminum brazing alloy, e.g. an Al-Si alloy containing 5-13% Si. Preferably, the aluminum alloy contains 0.2-0.6 wt. % Cu and 0.1-0.4 wt. % Mg, or 0.6-1.1 wt. % Cu and 0.1-0.4 wt. % Mg, or 0.4-0.7 wt. % Cu and less than 0.01 wt. % Mg. After brazing, a strip made of the above alloy has a microstructure of elongated grains with a form factor F above 2, or a microstructure of approximately equiaxial grains. Independent claims are given for: (a) a method for producing a strip of the above alloy having a microstructure of elongated grains with a form factor F above 2, comprising casting a plate, hot rolling without preliminary homogenization, cold-rolling to the desired thickness and recovery annealing at 250-300 degrees C; and (b) a method for producing a strip of the above alloy having a microstructure of approximately equiaxial grains, comprising casting a plate, homogenization of the plate at 590-630 degrees C, hot rolling, cold-rolling to the desired thickness and final annealing at 320-380 degrees C. |
