低温焼なましがオーステナイト系ばね用ステンレス鋼帯の単軸力学特性に与える影響

抄録

In order to investigate in-plane anisotropy of cold rolled stainless steel strip for springs (JIS SUS304CSP-H), tension and compression tests were performed using a universal testing machine and for the latter test, a modified compression test method was applied. Uniaxial tension and compression tests on as received and low temperature annealed (400 °C, 1.5 h) samples were carried out in rolling direction (RD), 45°(DD) and 90°(TD) inclined to it were subjected respectively. It was observed that the tensile elastic limit (0.05% proof stress) and 0.2% proof stress were distinctly larger than the compressive proof stresses in RD, while in TD samples, these two kinds of tensile proof stresses were smaller than the compressive proof stresses. These relations in as received samples were kept qualitatively even after low temperature annealing although the proof stress differences became smaller compared with as-rolled ones. The proof stresses of the annealed samples were relatively higher than that of the as received samples. Thus, it was experimentally confirmed that the low temperature annealing decreased the anisotropy of as-rolled strip.