| 摘要 |
<p>PURPOSE: A hot working tool steel, capable of the improvement of thermal conductivity and impact value and a steel product using the same are provided to control an impact value by controlling the content of Mn, Cr, Mo and V. CONSTITUTION: A hot working tool steel comprises C 0.20~0.50 Mass %, Si 0.01~0.25 Mass %, Mn 0.50~1.50 Mass %, Cr 5.24~9.00 Mass %, Mo 1.24~2.95 Mass %, V 0.30~0.70 Mass %, W 0.30~4.00 Mass %, Co 0.30~3.00 Mass %, Nb 0.004~0.100 Mass %, Ta 0.004~0.100 Mass %, Ti 0.004~0.100 Mass %, Zr 0.004~0.100 Mass %, Al 0.004~0.050 Mass %, N 0.004~0.050 Mass % and the rest composed of Fe and the inevitable impurity.</p> |
