Damage approved characteristic aluminum alloy product and its production method

摘要

The invention relates to a Product comprising an aluminium base alloy consisting of (in weight %): Cu3.8-4.9, Mg 1.2-1.8, Mn 0.1-0.9, Fe max. 0.12, Si max. 0.10, Ti max. 0.15, Zn max. 0.20, Cr max. 0.10, impurities each max. 0.05, total max. 0.15, balance aluminium, said product having a minimum L-0.2 % yield strength of 300 MPa or more, a minimum LT-0.2 % yield strength of 270 MPa, a minimum T-L fracture toughness KC(ao) of 100 MPa. 2ROOT m or more for a 700 mm wide CCT-panel, and having in both L/ST- and LT/ST-sections an average grain size of at least 6 according to ASTM E-112. Further the invention relates to a method for the manufacturing of such a product.