ALUMINUM ALLOY FOR WELD STRUCTURE EXCELLENT IN STRESS CORROSION CRACKING RESISTANCE AND PROOF STRESS VALUE AFTER WELDING

摘要

PURPOSE: To improve strength, weld crack resistance, and hot workability by specifying Mg, Mn, Cr, Cu, Fe+Si, Zr, Ni, etc. ;CONSTITUTION: The Al alloy has a composition containing, by weight, 4-8% Mg, 0.32-1.5% Mn, 0.03-0.5% Cr, 0.03-1% Cu, 0.1-1.5% (Fe+Si) so that Fe/Si2 is satisfied, 0.01-0.25% Zr, and 0.01-0.25% Ni as essential components. Moreover, one or more kinds selected from 0.005-0.2% Ti, 0.0001-0.08% B, 0.03-0.5% Mo, 0.01-0.2% V, and 0.03-5% rare earth element or misch metal are further incorporated. This Al alloy has superior strength including proof stress value after welding, stress corrosion cracking resistance, weld crack resistance, and further hot workability, such as in extrusion, rolling, and forging.;COPYRIGHT: (C)1994,JPO