| 摘要 |
<p>A high toughness ferritic stainless steel having the excellent cold workability and the excellent heading workability suitable for the plastic working of screws, which consists essentially of, by weight percentage, C </= 0.03%, P</=0.040%, S</=0.010%, Si</=1.0%, Mn</=1.0%, 11.5% </= Cr</=22.0%, 0.05%</=Nb</=0.80%, N</=0.025%, if necessary at least one selected from 0.2%</=Cu</=1.0%, 0.01</=Mo</=2.00%, 0.020%</=Ni</=1.50% and the balance being Fe and inevitable impulities, and the number of inlusions larger than 20 mu m among the inclusions composed of carbo-nitrides of Nb, Ti and/or Zr in the steel is not more than 20. In the production of the high toughness ferritec stainless steel, the rolling material having the above-mentioned chemical compositions is heated to 1200 DEG C or above at the rod rolling.</p> |
