| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a steel sheet for a can which exhibits excellent surface properties after drawing and ironing, wherein the roughening of the surface after working is slight and the peeling or the like of a film is not caused, and to provide a process for the production thereof. <P>SOLUTION: The steel sheet has a componential composition containing, by mass, 0.0016 to 0.01% C, 0.05 to 0.60% Mn and 0.020 to 0.080% Nb in such a manner that the contents of C and Nb satisfy inequality of 0.4≤(Nb/C)×(12/93)≤2.5. Then, the amount of Nb based precipitates is 20 to 500 mass ppm, the average grain size of the Nb based precipitates is 10 to 100 nm, and the average crystal grain size of ferrite is 6 to 10μm. Pinning effect is made optimum by using an extra-low carbon steel as a base, and adding Nb so as to control the amount and grain size of the Nb based precipitates, and by prescribing the addition amount of Mn, the ferrite grain sizes are refined so as to achieve the softening of the steel and excellent surface roughening resistance. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
