Al-Mg-Si alloy material and plate

摘要

A method for manufacturing an Al-Mg-Si series alloy plate includes the steps of hot-rolling and subsequently cold-rolling an Al-Mg-Si series alloy ingot. The Al-Mg-Si series alloy ingot consists of Si: 0.2 to 0.8 mass%, Mg:0.3 to 1 mass%, Fe: 0.5 mass% or less, Cu: 0.5 mass% or less, at least one of elements selected from the group consisting of Ti: 0.1 mass% or less and B: 0.1 mass% % or less and the balance being Al and inevitable impurities. Heat-treating for holding a rolled ingot at 200 to 400 °C for 1 hour or more is performed after a completion of the hot-rolling but before a completion of the cold-rolling.