To-oru Furukawa and Tomo-o Sato
17%Cr-7%Ni stainless steel containing 0.93%Al was experimented for determining its mechanical properties after several treatments such as solution treatment at 1050°C, 30∼70% cold-rolling and aging at 400∼500°C for 0.5∼500 hr. The following results were obtained: (1) Super-cooled austenite in this steel hardens due to internal stress and transformation into martensite by cold-rolling. The ratio of this hardening is larger than that of 18-8 stainless steel. (2) The hardness and the yielding strength of cold-rolled 17-7 PH steel increase exceedingly by aging at 400∼500° for suitable hours. (3) The highest mechanical properties of this steel were obtained under the following aging conditions; 400°C×100 hrs, 450°C×8∼12 hrs, 470°C×5∼8 hrs.
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