| 摘要 |
<p>0.01 - 0.10%, Si: 0.05 -1.0%, Mn: 0.05 - 1.5%, P: not more than 0.03%,S: not more than 0.01%, Cr: 9 - 15%, Ni: 0.1 - 4.5%, Al: not more than 0.05% and N: not more than 0.1% in mass%, and further comprising at least one of Cu: 0.05 - 5% and Mo: 0.05 - 5%, the residual being Fe and impurities, isprovided, wherein the contents of Cu and Mo satisfy the following formula (a) or (b), 0.2% <= Mo + Cu/4 <= 5% ... (a)0.55% <= Mo + Cu/4 <= 5% ... (b) and wherein the hardness is 30 - 45 in HRC and the carbide amount in grain boundaries of the prior austenite is not more than 0.5 volume %. The marensitic stainless steel has excellent properties regarding the sulfide stress cracking resistance, the resistance to corrosive wear and the localized corrosion.</p> |
