| 摘要 |
<p>The present invention relates a high-strength nonmagnetic stainless steel, containing, by weight percent, 0.01 to 0.06% of C, 0.10 to 0.50% of Si, 20.5 to 24.5% of Mn, 0.040% or less of P, 0.010% or less of S, 3.1 to 6.0% of Ni, 0.10 to 0.80% of Cu, 20.5 to 24.5% of Cr, 0.10 to 1.50% of Mo, 0.0010 to 0.0050% ofB, 0.010% or less of O, 0.65 to 0.90% of N, and the remainder being Fe and inevitable impurities; the steel satisfying the following formulae (1) to (4): <MathDetails id="matha01" num="(1),"><MathText><![CDATA[ <math display="block"><mfenced open="[" close="]" separators=""><mi mathvariant="normal">C</mi><mo></mo><mi mathvariant="normal">r</mi></mfenced><mo mathvariant="normal">+</mo><mn mathvariant="normal">3.3</mn><mo mathvariant="normal">×</mo><mfenced open="[" close="]" separators=""><mi mathvariant="normal">M</mi><mo></mo><mi mathvariant="normal">o</mi></mfenced><mo mathvariant="normal">+</mo><mn mathvariant="normal">16</mn><mo mathvariant="normal">×</mo><mfenced open="[" close="]"><mi mathvariant="normal">N</mi></mfenced><mo mathvariant="normal">≥</mo><mn mathvariant="normal">30</mn></math><img id="ia01" file="imga0001.tif" wi="91" he="10" img-content="math" img-format="tif" /> ]]></MathText></MathDetails><MathDetails id="matha02" num="(2),"><MathText><![CDATA[ <math display="block"><mfenced open="{" close="}" separators=""><mi mathvariant="normal">N</mi><mo></mo><mi mathvariant="normal">i</mi></mfenced><mo mathvariant="normal">/</mo><mfenced open="{" close="}" separators=""><mi mathvariant="normal">C</mi><mo></mo><mi mathvariant="normal">r</mi></mfenced><mo mathvariant="normal">≥</mo><mn mathvariant="normal">0.15</mn></math><img id="ia02" file="imga0002.tif" wi="58" he="8" img-content="math" img-format="tif" /> ]]></MathText></MathDetails><MathDetails id="matha03" num="(3),"><MathText><![CDATA[ <math display="block"><mn mathvariant="normal">2.0</mn><mo mathvariant="normal">≤</mo><mfenced open="[" close="]" separators=""><mi mathvariant="normal">N</mi><mo></mo><mi mathvariant="normal">i</mi></mfenced><mo mathvariant="normal">/</mo><mfenced open="[" close="]" separators=""><mi mathvariant="normal">M</mi><mo></mo><mi mathvariant="normal">o</mi></mfenced><mo mathvariant="normal">≤</mo><mn mathvariant="normal">30.0</mn></math><img id="ia03" file="imga0003.tif" wi="56" he="9" img-content="math" img-format="tif" /> ]]></MathText></MathDetails> and<MathDetails id="matha04" num="(4),"><MathText><![CDATA[ <math display="block"><mfenced open="[" close="]"><mi mathvariant="normal">C</mi></mfenced><mo mathvariant="normal">×</mo><mn mathvariant="normal">1000</mn><mo mathvariant="normal">/</mo><mfenced open="[" close="]" separators=""><mi mathvariant="normal">C</mi><mo></mo><mi mathvariant="normal">r</mi></mfenced><mo mathvariant="normal">≤</mo><mn mathvariant="normal">2.5</mn></math><img id="ia04" file="imga0004.tif" wi="59" he="9" img-content="math" img-format="tif" /> ]]></MathText></MathDetails>
wherein [Cr], [Mo], [N], [Ni], [Mo] and [C] represent the content of Cr, the content of Mo, the content of N, the content of Ni, the content of Mo and the content of C in the steel, respectively, and {Ni} represents the sum of [Ni], [Cu] and [N], and {Cr} represents the sum of [Cr] and [Mo]. The present invention further relates to a high-strength nonmagnetic stainless steel part containing the steel and a process for producing the same.</p> |
