THREADED FASTENER

摘要

PROBLEM TO BE SOLVED: To provide threaded fasteners which have light weight and excellent productivity and by which manufacturing steps can be decreased and manufacturing costs can be reduced. SOLUTION: The threaded fasteners can be obtained by subjecting industrial pure magnesium or a magnesium alloy or a composite material using these as a matrix, each having a fine-grained superplastic structure of≤100μm grain size, to heating to 250 to 400°C where a superplastic phenomenon occurs and carrying out forming by warm forging utilizing the superplastic phenomenon. COPYRIGHT: (C)2004,JPO