| 摘要 |
<p>It is possible to securely produce high Si-containing austenitic stainless steel having corrosion resistance usable in a highly-concentrated nitric acid environment at a high temperature without generating scabs by heating and hot-rolling a slab of stainless steel at a heating temperature during the hot rolling, and subsequently, carrying out heat treatment to heat the hot-rolled stainless steel at a temperature of 1100 to 1160°C, and thereafter, to cool this stainless steel at cooling rate of at least 100°C/min. , wherein the slab of stainless steel has a chemical composition containing: C: at most 0.04% ; Cr: 7 to 20%, Ni: 10 to 22%, Si: 2.5 to 7%, Mn: at most 10% , sol. Al: at most 0.03% , P: at most 0.03% , S: at most 0.03% ; N: at most 0.035% , a total amount of one or more types of elements selected from Nb, Ti, Ta, and Zr: 0.05 to 0.7%; and the remainder being Fe and impurities, and the heating temperature during the hot rolling is defined as T h in which ”T of Formula (1): T h = 1135 - 90Si - 2.9Cr + 40Ni - ”T is at least 30°C.</p> |
