FRANKFURT, Sept 16 (Reuters) - Thyssenkrupp on Thursday said it had agreed to sell its Italian stainless steel division to Arvedi, the latest step in the conglomerate’s efforts to restructure and wean itself off non-core assets. Acciai Speciali Terni (AST) has for years been on Thyssenkrupp’s list of potential disposal candidates and marks the biggest item in the conglomerate’s Multi-Tracks division of businesses it wants to sell, restructure or close. AST is Europe’s fourth-largest stainless steel maker behind Finland’s Outokumpu, Luxembourg-based Aperam and Spain’s Acerinox.