| 摘要 |
PROBLEM TO BE SOLVED: To provide an Al-Mn-Mg alloy plate which is excellent in laser beam weldability for a material of a small case subjected to the heating and internal pressure, for example, a square battery case, and less easily generate swelling in using the case, and its manufacturing method. SOLUTION: The Al-Mn-Mg alloy plate has the composition consisting of 0.8-2.0% Mn, 0.2-0.75% Mg, and the balance Al with inevitable impurities while impurity elements Si and Fe are limited to 0.04-0.2% and 0.04-0.6%, respectively, and the solid solution Mn is >=0.2%, and the proof stress is in a range of 170 to 270 N/mm2.
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