| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a wear-resistant steel sheet having low temperature toughness as well as wear resistance. <P>SOLUTION: The wear-resistant steel sheet includes a composition comprising, by mass%, 0.10-0.30% C, 0.05-0.45% Si, 0.1-2.0% Mn,≤0.020% P,≤0.005% S, 0.10-1.40% W, 0.0003-0.0020% B, further 0.005-0.1% Ti and/or 0.035-0.1% Al, and the balance Fe with inevitable impurities. The steel sheet has a martensite phase of≥90 vol.% in a state of quenching as it is, or further has the composition of old austenite grain having an average grain size of≤30μm. Thus, the steel sheet has high hardness in the surface layer portion thereof and has excellent low-temperature toughness as well as excellent wear resistance. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
