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    • 1. 发明授权
    • Steel sheet for can and manufacturing method thereof
    • 罐用钢板及其制造方法
    • US06221180B1
    • 2001-04-24
    • US09445404
    • 1999-12-07
    • Akio TosakaMasatoshi ArataniOsamu FurukimiHideo KuguminatoMakoto ArataniYuji Miki
    • Akio TosakaMasatoshi ArataniOsamu FurukimiHideo KuguminatoMakoto ArataniYuji Miki
    • C21D800
    • C22C38/06C21D8/0273C21D2211/005C21D2211/009C22C38/002C22C38/04C22C38/14
    • The invention provides a can steel sheet having satisfactory surface appearance and having workability, appearance property after working and high yield that can meet demands on complicated can forming, and a manufacturing process thereof. To be more specific, according to the invention, a slab having a composition containing, in weight %, C: more than 0.005% and equal to or less than 0.1%, Mn: 0.05-1.0% is subjected to hot-rolling at a finishing temperature of 800 to 1000° C., to coiling at 500 to 750° C., to cold-rolling, followed by continuous annealing at a recrystallization temperature or higher and 800° C. or lower, and then to box annealing at a temperature higher than 500° C. and equal to or lower than 600° C. for 1 hr or longer. The steel sheet has preferably a structure containing ferrite as a principle phase and having a mean grain diameter of 10 &mgr;m or less and further containing 0.1-1% by weight of pearlite grains each having a grain diameter of 0.5-3 &mgr;m. To obtain satisfactory surface appearance, it is preferable that the steel contains: Ti: 0.015-0.10%, Al: 0.001-0.01%, and a total of 0.0005-0.01% of one or two members of Ca, REM, and S−5×((32/40)Ca+(32/140)REM) of 0.0014% or less.
    • 本发明提供一种具有令人满意的表面外观和可加工性,加工后的外观性能和能够满足复杂罐形成的要求的高产率的罐钢板及其制造方法。 更具体地说,根据本发明,将具有以重量%计含有C:大于0.005%并且等于或小于0.1%的Mn:0.05-1.0%的组成的板坯在 精加工温度为800〜1000℃,在500〜750℃下卷取,进行冷轧,然后在再结晶温度以上且800℃以下进行连续退火,然后在 温度高于500℃,等于或低于600℃,持续1小时或更长时间。 钢板优选具有铁素体作为主相,平均粒径为10μm以下的结构,并且还含有0.1-1重量%的粒径为0.5-3μm的珠光体组织。 为了获得令人满意的表面外观,优选钢包含:Ti:0.015-0.10%,Al:0.001-0.01%,以及Ca,REM和S-5x中的一种或两种成分的总计0.0005-0.01% ((32/40)Ca +(32/140)REM)为0.0014%以下。
    • 3. 发明授权
    • High-strength hot-rolled steel sheet having excellent stretch flangeability, and method of producing the same
    • 拉伸凸缘性优异的高强度热轧钢板及其制造方法
    • US06364968B1
    • 2002-04-02
    • US09586421
    • 2000-06-02
    • Eiko YasuharaAkio TosakaOsamu FurukimiTakao UchiyamaNobuo Yamada
    • Eiko YasuharaAkio TosakaOsamu FurukimiTakao UchiyamaNobuo Yamada
    • C22C3814
    • C21D1/20C21D8/0226C21D2211/002C22C38/04C22C38/12C22C38/14
    • The invention provides a thin high-strength hot-rolled steel sheet with a thickness of not more than 3.5 mm which has excellent stretch flangeability and high uniformity in both shape and mechanical properties of the steel sheet, as well as a method of producing the hot-rolled steel sheet. A slab containing C: 0.05-0.30 wt %, Si: 0.03-1.0 wt %, Mn: 1.5-3.5 wt %, P: not more than 0.02 wt %, S: not more than 0.005 wt %, Al: not more than 0.150 wt %, N: not more than 0.0200 wt %, and one or two of Nb: 0.003-0.20 wt % and Ti: 0.005-0.20 wt % is heated at a temperature of not higher than 1200° C. The slab is hot-rolled at a finish rolling end temperature of not lower than 800° C., preferably at a finish rolling start temperature of 950-1050° C. A hot-rolled sheet is started to be cooled within two seconds after the end of the rolling, and then continuously cooled down to a coiling temperature at a cooling rate of 20-150° C./sec. The hot-rolled sheet is coiled at a temperature of 300-550° C., preferably in excess of 400° C. A fine bainite structure is obtained in which the mean grain size is not greater than 3.0 &mgr;m, the aspect ratio is not more than 1.5, and preferably the maximum size of the major axis is not greater than 10 &mgr;m.
    • 本发明提供一种厚度不大于3.5mm的薄的高强度热轧钢板,其在钢板的形状和机械性能方面具有优异的拉伸凸缘性和高均匀性,以及制造热 卷钢板 含有C:0.05-0.30重量%,Si:0.03-1.0重量%,Mn:1.5-3.5重量%,P:不大于0.02重量%的S:不大于0.005重量%的Al:不大于 0.150重量%,N:不大于0.0200重量%,Nb:0.003-0.20重量%和Ti:0.005-0.20重量%中的一个或两个在不高于1200℃的温度下加热。 在终轧温度不低于800℃,优选在950-1050℃的精轧起始温度下进行。在轧制结束后2秒钟内开始冷轧热轧板 ,然后以20-150℃/秒的冷却速度连续冷却至卷取温度。 热轧板在300-550℃,优选超过400℃的温度下卷绕。得到平均粒径不大于3.0μm的细贝氏体组织,纵横比不是 大于1.5,优选长轴的最大尺寸不大于10um。
    • 4. 发明授权
    • High tensile hot-rolled steel sheet having excellent strain aging hardening properties and method for producing the same
    • 具有优异的应变时效硬化性能的高强度热轧钢板及其制造方法
    • US07252724B2
    • 2007-08-07
    • US10643227
    • 2003-08-18
    • Akio TosakaSinjiro KanekoYoichi TominagaNoriyuki KatayamaNobutaka KurosawaKei SakataOsamu Furukimi
    • Akio TosakaSinjiro KanekoYoichi TominagaNoriyuki KatayamaNobutaka KurosawaKei SakataOsamu Furukimi
    • C21D8/02
    • C21D8/0226C21D8/0236C21D2221/02C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12
    • A high tensile strength hot-rolled steel sheet having superior strain aging hardenability, which has high formability and stable quality characteristics, and in which satisfactory strength is obtained when the steel sheet is formed into automotive components, thus enabling the reduction in weight of automobile bodies is provided. Specifically, a method for producing a high tensile strength hot-rolled steel sheet having superior strain aging hardenability with a BH of 80 MPa or more, a ΔTS of 40 MPa or more, and a tensile strength of 440 MPa or more includes the steps of heating a steel slab to 1,000° C. or more, the steel slab containing, in percent by mass 0.15% or less of C, 2.0% or less of Si, 3.0% or less of Mn, 0.08% or less of P, 0.02% or less of S, 0.02% or less of Al, 0.0050% to 0.0250% of N, and optionally 0.1% or less in total of at least one of more than 0.02% to 0.1% of Nb and more than 0.02% to 0.1% of V, the ratio N (mass %)/Al (mass %) being 0.3 or more, rough-rolling the steel slab to form a sheet bar; finish-rolling the sheet bar at a finishing temperature of 800° C. or more; cooling at a cooling rate of 20° C. to 40° C./s or more within 0.5 second after the finish-rolling; and coiling at a temperature of 650° C. to 450° C. or less.
    • 具有优异的应变时效淬透性的高拉伸强度热轧钢板,其成形性高,质量特性稳定,当将钢板形成汽车部件时,能够获得令人满意的强度,能够减轻汽车车身的重量 被提供。 具体而言,制造具有优异的应变时效淬透性,BH为80MPa以上,ΔTS为40MPa以上,拉伸强度为440MPa以上的高强度热轧钢板的制造方法,其特征在于, 将钢坯加热至1000℃以上时,含有以质量%计含有0.15%以下的Si,2.0%以下的Si,3.0%以下的Mn,0.08%以下的P,0.02 S%以下,Al:0.02%以下,N:0.0050〜0.0250%,Nb:0.02〜0.1%,Nb:0.02〜0.1% V的百分比,N(质量%)/ Al(质量%)的比例为0.3以上,对钢坯进行粗轧以形成板坯; 在800℃或更高的终轧温度下对板材进行精轧; 在精轧后的0.5秒内以20℃至40℃/秒的冷却速度冷却; 并在650℃至450℃或更低的温度下卷取。