PROCESS FOR MANUFACTURING THIN STRIP OF FERRITIC STAINLESS STEEL, AND THIN STRIP THUS OBTAINED

摘要

PROCESS FOR MANUFACTURING THIN STRIP OF FERRITIC STAINLESS STEEL, AND THIN STRIP THUS OBTAINED The subject of the invention is a process for manufacturing ferritic stainless steel strip, in which a strip of a f erritio-^s^ainless steel, of the type containing at most /0.012.%- of carbon, at most 1% of manganese, at most 1% of silicon, at most 0.040% of phosphorus, at most 0.030% of sulphur and between 16 and 18% of chromium, is solidified, directly from liquid metal, between two close-together, internally-cooled, counterrotating rolls with horizontal axes, characterized in that the said strip is then cooled or left to cool so as to avoid making it remain within the austenite to ferrite and carbides transformation range, in that the said strip is coiled at a temperature of between 600°C and the martensitic transformation temperature Ms, in that the coiled strip is left to cool at a maximum rate of 300°C/h down to a temperature of between 200°C and ambient temperature and in that the said strip then undergoes box annealing. The subject of the invention is also a ferritic stainless steel strip of the type containing at most ^0.012%/of carbon, at most 1% of manganese, at most 1% of silicon, at most 0.040% of phosphorus, at most 0 • 030% of sulphur and between 16 and 18% of chromium, characterized in that it is capable of being obtained by the above process. Figure for the abstract: Figure 3 PROCESS FOR MANUFACTURING THIN STRIP OF FERRITIC STAINLESS STEEL, AND THIN STRIP THUS OBTAINED Abstract The subject of the invention is a process for manufacturing ferritic stainless steel strip, in which a strip of a f erritio-^s^ainless steel, of the type containing at most /0.012.%- of carbon, at most 1% of manganese, at most 1% of silicon, at most 0.040% of phosphorus, at most 0.030% of sulphur and between 16 and 18% of chromium, is solidified, directly from liquid metal, between two close-together, internally-cooled, counterrotating rolls with horizontal axes, characterized in that the said strip is then cooled or left to cool so as to avoid making it remain within the austenite to ferrite and carbides transformation range, in that the said strip is coiled at a temperature of between 600°C and the martensitic transformation temperature Ms, in that the coiled strip is left to cool at a maximum rate of 300°C/h down to a temperature of between 200°C and ambient temperature and in that the said strip then undergoes box annealing. The subject of the invention is also a ferritic stainless steel strip of the type containing at most ^0.012%/of carbon, at most 1% of manganese, at most 1% of silicon, at most 0.040% of phosphorus, at most 0 • 030% of sulphur and between 16 and 18% of chromium, characterized in that it is capable of being obtained by the above process. Figure for the abstract: Figure 3