| 摘要 |
<p>: The ferrous materials of this invention, which are produced in the shape of tubes or bars by subjecting to plastic deformation by drawing and subsequently by subjecting to annealing treatment conducted under stated conditions, retain a flattened structure substantially free from recrystallization and acquire a hardness which is greater by 55% to 125% than the hardness acquired by iron and steel materials which are treated by full annealing. The ferrous materials notably excel the conventional products in terms of fatigue strength against bending, vibrations, etc.</p> |
