| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminium alloy extruded material that has high bearing strength while having excellent bendability and cracking resistance.SOLUTION: The high bearing-strength aluminium alloy extruded material is an extruded material of aluminium alloy comprising Zn: 5.0 to 7.0 wt%, Mg: 0.5 to 1.5 wt%, Cu: 0.05 to 0.3 wt%, Zr: 0.15 wt% or less, Fe: 0.1 to 0.4 wt%, Si: 0.05 to 0.4 wt%, and the balance: Al and inevitable impurities, and in which, characterized, 90% or more of the metallographic structure is re-crystallized structure. |
