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发明授权
CN101578384B 焊接热影响区的CTOD特性优异的钢及其制造方法 有权

焊接热影响区的CTOD特性优异的钢及其制造方法
摘要：
本发明提供在小～中线能量的多层焊接等中，除了-60℃的FL部的CTOD特性以外，也满足IC部的CTOD特性的具有迄今所没有的优异的CTOD(断裂韧性)特性的高强度的钢及其制造方法。本发明的钢，是焊接热影响区的CTOD特性优异的钢，其特征在于，以质量％计，含有C：0.015～0.045％、Si：0.05～0.2％、Mn：1.5～2.0％、Cu：0.25～0.5％、Ni：0.7～1.5％、P：0.008％以下、S：0.005％以下、Al：0.004％以下、Ti：0.005～0.015％、Nb：0.005％以下、O：0.0015～0.0035％、N：0.002～0.006％，PCTOD为0.065以下，CeqH为0.235以下，其余部分由铁以及不可避免的杂质构成。
摘要（英）：

This invention provides a high-strength steel, which has unprecedentedly excellent CTOD (fracture toughness) properties, that is, for example, in multilayer welding of small to middle heat input, can satisfy, in addition to CTOD properties in an FL part at -60 DEG C, CTOD properties in an IC part, and a process for producing the steel. The steel has a weld heat-affected zone having excellent CTODproperties and is characterized by comprising, by mass, C: 0.015 to 0.045%, Si: 0.05 to 0.2%, Mn: 1.5 to 2.0%, Cu: 0.25 to 0.5%, Ni: 0.7 to 1.5%, P: not more than 0.008%, S: not more than 0.005%, Al:not more than 0.004%, Ti: 0.005 to 0.015%, Nb: not more than 0.005%, O: 0.0015 to 0.0035%, and N: 0.002 to 0.006% with the balance consisting of iron and unavoidable impurities, the steel having a PCTOD value of not more than 0.065 and a CeqH value of not more than 0.235.

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