The earth crust implies the importance of ferrous metal High strength,machinability, alloying element Function provided by nonferrous metal: Corrosion resistance:Titanium,Brass Low density:Aluminum,Magnesium Strength at elevated temperature:Nickel PDF文件使用"pdfFactory Pro”试用版本创建ww.fineprint.com.cnThe earth crust implies the importance of ferrous metal High strength，machinability， alloying element Function provided by nonferrous metal: Corrosion resistance：Titanium, Brass Low density: Aluminum , Magnesium Strength at elevated temperature: Nickel PDF 文件使用 "pdfFactory Pro" 试用版本创建 ÿwww.fineprint.com.cn