Abstract
To investigate the influence of P on properties of 13 Cr stainless steels, which were widely used for kitchen utensils, medical instruments, high-temperature duties and otheruses. The authors measured the transformation temperatures, the hardness change, the mechanical properties at room and elevated temperatures and studied the corrosion resistance to 40% boiling nitric acid and to 5% acetic acid at room temperature and boiling.The results obtained were as follows:(1) The Ac transformation temperatures were raised but the Ar beginning points were lowered by P addition.(2) The as-annealed hardness of these steels and of cold-drawn materials were increased with P contents. The as quenchd hardness was subjected to the influence of quenching temperatures but was not affected by P content. The resistance to softening by tempering were enhanced by P addition(3) The tensile and yield strengths at room and elevated temperatures were increased by P addition, but elongation and reduction of area at room temperature were slightly degreased. The impact strength were lowered with P content.(4) The corrosion resistance to 40% boiling nitric acid was enhanced by less than 0.05% P, but the resi stance to 5% boiling acetic acid was decreased by P addition.
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