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发明授权
CN103732776B 在低温下的冲击能吸收特性和耐HAZ软化特性优异的高屈服比热轧钢板及其制造方法 有权

在低温下的冲击能吸收特性和耐HAZ软化特性优异的高屈服比热轧钢板及其制造方法
摘要：
本发明提供一种最大拉伸强度为600MPa以上、在低温下的冲击能吸收特性和耐HAZ软化特性优异的高屈服比热轧钢板及其制造方法。以质量%计，含有C：0.04～0.09%、Si：0.4%以下、Mn：1.2～2.0%、P：0.1%以下、S：0.02%以下、Al：1.0%以下、Nb：0.02～0.09%、Ti：0.02～0.07%、N：0.005%以下，2.0≤Mn＋8［%Ti］＋12［%Nb］≤2.6，其余量包含Fe和不可避免的杂质；包含：珠光体的面积分数为5%以下，马氏体和残余奥氏体的合计面积分数为0.5%以下，其余量为铁素体和/或贝氏体的金相组织；铁素体和贝氏体的平均晶体粒径为10μm以下，含有Ti和Nb的失配析出的合金碳氮化物的平均粒径为20nm以下；屈服比为0.85以上。
摘要（英）：

Hot rolled steel sheet which has a maximum tensile strength of 600 MPa or more and has an excellent low temperature impact energy absorption and HAZ softening resistance and a method of production of the same are provided, that is, sheet which contains, by mass%, C: 0.04 to 0.09%, Si: 0.4% or less, Mn: 1.2 to 2.0%, P: 0.1% or less, S: 0.02% or less, Al: 1.0% or less, Nb: 0.02 to 0.09%, Ti: 0.02 to 0.07%, and N: 0.005% or less, where 2.0‰¤Mn+8[%Ti]+12[%Nb]‰¤2.6, has a balance of Fe and unavoidable impurities, has an area percentage of pearlite of 5% or less, has a total area percentage of martensite and retained austenite of 0.5% or less, has a balance of a metal structure of ferrite and/or bainite, has an average grain size of ferrite and bainite of 10 µm or less, has an average particle size of alloy carbonitrides with incoherent interfaces which contain Ti and Nb of 20 nm or less, and has a yield ratio of 0.85 or more.

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