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1. 发明授权

US5509977A High strength hot rolled steel plates and sheets excellent in uniform elongation after cold working and process for producing the same 失效
标题翻译：冷加工后的均匀伸长率优异的高强度热轧钢板和片材及其制造方法
公开(公告)号：US5509977A
公开(公告)日：1996-04-23
申请号：US256224
申请日：1994-06-24
申请人： Seinosuke Yano , Koh Moriyama , Takashi Harabuchi , Yoshikazu Nakano , Hiroshi Mochiki , Kimio Nagata
发明人： Seinosuke Yano , Koh Moriyama , Takashi Harabuchi , Yoshikazu Nakano , Hiroshi Mochiki , Kimio Nagata
IPC分类号： C21D8/02 , C22C38/14 , C22C38/54 , C21D7/13
CPC分类号： C21D8/0226 , C22C38/14 , C21D8/021
摘要： The present invention provides hot rolled steel plates and sheets having a tensile strength of 34 to 62 kgf/mm.sup.2 and excellent in a uniform elongation even after cold working the steel plates and sheets to give round and square tubes, shapes, sheet piles, etc., to such an ordinary degree that the productivity is not lowered, and a process for producing the hot rolled steel plates and sheets. The hot rolled steel plates and sheets contain from 0.04 to 0.25% of C, from 0.0050 to 0.0150% of N and from 0.003 to 0.050% of Ti, also contain from 0.0008 to 0.015% of TiN having a particle size exceeding 1 .mu.m and dispersed in the matrix thereof, and have Ceq. (WES) of 0.10 to 0.45%. The process comprises heating a steel slab containing the constituents as mentioned above to 1,000 to 1,300.degree. C., starting to roll the steel slab subsequently and finishing rolling at a temperature of at least the Ar.sub.3 transformation point, and air cooling from a temperature of at least 500.degree. C. or coiling at a temperature of at least 500.degree. C. and air cooling, the resultant steel structure having a pearlite phase in an amount of 5 to 20% in terms of area fraction.
摘要翻译： PCT No.PCT / JP93 / 01580 Sec。 371日期：1994年6月24日 102（e）日期1994年6月24日PCT提交1993年10月29日PCT公布。公开号WO94 / 10355 日期：1994年5月11日本发明提供拉伸强度为34〜62kgf / mm2的热轧钢板和板材，即使在冷板加工钢板和板材之后，均匀延伸性也优异，得到圆形和方管，片材等，达到生产率不降低的普通程度，以及制造热轧钢板和片材的方法。热轧钢板和片材含有0.04〜0.25％的C，0.0050〜0.0150％的N，0.003〜0.050％的Ti，还含有0.0008〜0.015％的粒径超过1μm的TiN，分散在其基质中，并具有Ceq。（WES）为0.10〜0.45％。该方法包括将含有上述成分的钢坯加热至1000至1300℃，随后开始轧制钢坯，并在至少Ar 3相变点的温度下进行精轧，并从至少500℃或在至少500℃的温度下卷取并空气冷却，所得到的钢结构具有的面积分数为5〜20％的珠光体相。

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