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发明公开
CN101939459A 高强度热轧钢板及其制造方法 有权

高强度热轧钢板及其制造方法
摘要：
提供使用廉价的Ti系广泛使用的钢板的、拉伸强度(TS)为540～780MPa、且强度偏差小的强度均匀性优良的高强度热轧钢板。成分组成为，以质量％计，含有C：0.05～0.12％、Si：0.5％以下、Mn：0.8～1.8％、P：0.030％以下、S：0.01％以下、Al：0.005～0.1％、N：0.01％以下、Ti：0.030～0.080％，余量由Fe及不可避免的杂质构成。而且，组织为多边形铁素体以70％以上的比例存在，并且尺寸小于20nm的析出物中存在的Ti量为通过下式(1)计算的Ti*值的50％以上。Ti*＝[Ti]-48÷14×[N]…(1)这里，[Ti]和[N]分别表示钢板的以质量％计的Ti和N的成分组成。
摘要（英）：

A high-strength hot-rolled steel sheet which has a tensile strength (TS) of 540 to 780MPa, a small scatter of strength, and excellent uniformity of strength is provided by using an inexpensive general-purpose Ti steel sheet. The composition contains by mass C: 0.05 to 0.12%, Si: 0.5% or less, Mn: 0.8 to 1.8%, P: 0.030% or less, S: 0.01% or less, Al: 0.005 to 0.1%, N: 0.01% or less, and Ti: 0.030 to 0.080% with the balance consisting of Fe and unavoidable impurities. The structure comprises at least 70% of polygonal ferrite in terms of fraction and the quantity of Ti present in precipitates having sizes of less than 20nm is not less than 50% of the Ti* value calculated by formula (1): Ti* = [Ti] - 48 14 [N] ... (1) wherein [Ti] and [N] are the respective contents (mass%) of Ti and N in the steel sheet.

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