METHOD FOR CONTINUOUSLY CASTING FERRITIC STAINLESS STEEL STRIPS FREE OF MICROCRACKS

摘要

The invention concerns a method for continuously casting a ferritic stainless steep strip with thickness not more than 10 mm directly from liquid metal between two cooled rolls with horizontal axes and driven in rotation, characterized in that: the liquid metal composition in weight percentages is as follows: % C+% N=0.12; % Mn=1; % P=0.4; % Si=1; % Mo=2.5; % Cr between 11 and 19; A1=1%; % Ti+%Nb+% Zr=1; the rest being iron and the impurities resulting from preparation; the Upsilp index of the liquid metal ranges between 35% and 60%, Upsilp being defined by the formula: gammap=420% C+470% N+23% Ni+9% Cu+7% Mn 11.5% Cr 11.5% Si 12% Mo 23% V 47% Nb 49% Ti 52% A1+189: the surface roughness of said rolls being more than 5 mum; in the proximity of the meniscus metal liquid present between the rolls an inerting gas is used consisting of at least 60% by volume of a gas soluble in steel.