HIGH-STRENGTH STEEL, AND CRANKSHAFT MANUFACTURED USING SAID HIGH-STRENGTH STEEL
    1.
    发明公开
    HIGH-STRENGTH STEEL, AND CRANKSHAFT MANUFACTURED USING SAID HIGH-STRENGTH STEEL 审中-公开
    HOCHFESTER STAHL UND MIT DIESEM HOCHFESTER STAHL HERGESTELLTE KURBELWELLE

    公开(公告)号:EP3040438A4

    公开(公告)日:2017-05-17

    申请号:EP14841312

    申请日:2014-08-26

    摘要: An object of this invention is to provide a high-strength steel endowed with high fatigue strength while also having increased strength and toughness, and a crankshaft manufactured using this high-strength steel. The high-strength steel according to the invention contains 0.30 mass % or more and 0.50 mass % or less of C, more than 0 mass % and 0.15 mass % or less of Si, 0.80 mass % or more and 1.5 mass % or less of Mn, 0.8 mass % or more and 2.4 mass % or less of Ni, 1.0 mass % or more and 3.0 mass % or less of Cr, 0.35 mass % or more and 0.70 mass % or less of Mo, 0.10 mass % or more and 0.25 mass % or less of V and 0.001 mass % or more and 0.040 mass % or less of Al, with the balance being iron and inevitable impurities. The high-strength steel is mainly composed of martensit, wherein a Mn concentration in cementite is 0.90 mass % or more and 1.80 mass % or less, and a ratio of Mn content to Si content is 5.50 or more.

    摘要翻译: 本发明的目的是提供一种高强度钢,其具有高疲劳强度,同时还具有增加的强度和韧性,以及使用该高强度钢制造的曲轴。 本发明的高强度钢中,含有C:0.30质量%以上且0.50质量%以下,Si:大于0质量%且0.15质量%以下,0.80质量%以上且1.5质量%以下 Mn:0.8质量%以上且Ni:2.4质量%以下,Cr:1.0质量%以上且3.0质量%以下,Mo:0.35质量%以上且0.70质量%以下,Mo:0.10质量%以上,Mn: V:0.25质量%以下,Al:0.001质量%以上且0.040质量%以下,其余为铁和不可避免的杂质。 高强度钢主要由马氏体组成,其中渗碳体中的Mn浓度为0.90质量%以上且1.80质量%以下,且Mn含量与Si含量之比为5.50以上。