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公开(公告)号：EP0706845A4
公开(公告)日：1997-05-02
申请号：EP95913335
申请日：1995-03-24
申请人： NIPPON STEEL CORP
发明人： NAKASHIMA HIROYUKI , OKA HIDEKI , TAKEUCHI HIDEMARO , TANAKA SHIGENORI , FUKUDA YOSHIMORI , AKAMATSU SATOSHI , MIYAZAKI MASAFUMI , MATSUMURA YOSHIKAZU
CPC分类号： B22D11/0622 , B22D11/0697 , B22D11/1213
摘要： In continuous casting of a carbon steel thin strip slab, the present invention makes the scales generated in the slab thin and produces a composition suitable for machining such as cold rolling and pressing. The construction of an apparatus for restricting the occurrence of the scales is simplified, a consumption quantity of an inert gas is saved, and the slab is produced efficiently. A carbon steel containing not greater than 0.5 % of C is cooled and solidified by a pair of cooling drums to produce a thin strip slab having a thickness of not greater than 10 mm, the slab so produced is introduced into a sealed chamber and is held in an argon atmosphere having an oxygen gas concentration of not higher than 5 % within a temperature range of up to at least 1200 DEG C, the temperature range is then cooled to 750 to 800 DEG C at a cooling rate of at least 10 DEG C/sec, and the slab is taken up by a winding machine into a coil within a temperature range of 500 to 800 DEG C. The atmosphere described above is generated by utilizing a nitrogen gas or a combustion waste gas, the formation of the scales is restricted, and the composition is controlled.
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2.发明公开
公开(公告)号：EP0707908A4
公开(公告)日：1997-05-02
申请号：EP95913413
申请日：1995-04-03
申请人： NIPPON STEEL CORP
发明人： MATSUMURA YOSHIKAZU , MORIMOTO YOSHIO , SHIO KIYOMI , UESHIMA YOSHIYUKI , MIZOGUCHI TOSHIAKI , AKAMATSU SATOSHI , OGAWA SHIGERU , KOYAMA KAZUO
CPC分类号： B21B1/463 , B21B41/08 , B21B45/0218 , B21B2045/006 , B22D11/0622 , B22D11/1206
摘要： A twin-roll type continuous casting device is provided which can produce sheets having good mechanical strength obtained through uniform crystal grain refinement and smooth and low surface roughness obtained by reducing variation in the quality of material and reduce equipment costs. A temperature of a cast piece C obtained by being solidified by means of a pair of water-cooled casting rolls (2a, 2b) is regulated to fall within a temperature range where an austenite structure exists in its own matrix, and after it has been so solidified, the cast piece is then rolled by means of an inline rolling mill (5) at a temperature ranging from 850 °C or higher to 1350 °C or lower and with a rolling reduction ranging from 5 % or higher to 50 % or lower in one pass, whereby the variation in total elongation of steel material is kept within 5 % in standard deviation.
摘要翻译： 提供了一种双辊型连续铸造装置，其可以生产通过均匀的晶粒细化获得的具有良好机械强度的片材，并且通过减少材料质量的变化而获得的平滑和低的表面粗糙度，并降低设备成本。 将通过一对水冷铸造辊（2a，2b）固化得到的铸件C的温度调节为在其自身的基体中存在奥氏体组织的温度范围内， 固化后，通过在线轧机（5）在850℃以上至1350℃以下的温度下进行轧制，轧制压下率在5％以上至50％以下，或 一次通过下降，由此钢材的总伸长率的变化在标准偏差中保持在5％以内。
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3.发明公开COLD-ROLLED SHEET AND HOT-GALVANIZED, COLD-ROLLED SHEET, BOTH EXCELLENT IN BAKE HARDENING, COLD NONAGING AND FORMING PROPERTIES, AND PROCESS FOR PRODUCING THE SAME. 失效冷轧钢板，镀锌可能，具有良好的老化淬透性，良好的冷成形性和耐时效性和生产它们的方法。
公开(公告)号：EP0620288A4
公开(公告)日：1995-01-25
申请号：EP93919599
申请日：1993-08-31
申请人： NIPPON STEEL CORP
CPC分类号： C21D8/0426 , C21D8/0436 , C21D8/0473
摘要： A cold-rolled sheet or a hot-galvanized, cold-rolled sheet having high paint bake hardening and cold nonaging properties and being excellent in the forming properties such as an average r value (deep drawing characteristics) and elongation (bulging characteristics) is produced by annealing an ultralow-carbon steel itself or one containing at least either titanium or niobium above the Ac3 transformation point to thereby give thereto a single-phase structure of low-temperature transformation product. As regards the paint bake hardening properties, it is possible to realize a BH value as high as about 10 kgf/mm2.
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