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    • 1. 发明专利
    • 方向性電磁鋼板の評価方法および方向性電磁鋼板の製造方法
    • 面向电磁钢板的评估方法和面向电磁钢板的制造方法
    • JP2015052589A
    • 2015-03-19
    • JP2014131989
    • 2014-06-27
    • Jfeスチール株式会社Jfe Steel Corp
    • YAMASHITA TAKAKOTAKAMIYA TOSHITO
    • G01N33/20C21D8/12C22C38/00C22C38/60
    • 【課題】方向性電磁鋼板の製造工程の初期の段階において、製品板における鉄損不良を高い精度で予測し、鉄損特性に優れる方向性電磁鋼板を安価かつ安定して提供することができる方向性電磁鋼板の評価方法および方向性電磁鋼板の製造方法を提供する。【解決手段】熱間圧延工程以降の任意の製造工程における鋼板に、焼鈍分離剤を塗布し、その後最高到達温度1100℃以上での二次再結晶焼鈍、および980℃以上1025℃以下での純化焼鈍を施したものを供試材とし、前記供試材の表面から30〜60μmの領域の任意の位置より開始し、前記供試材の所定量を溶解して終える電解抽出を行って、得られる溶解物に含まれるインヒビターが所定の個数以下であるものを合格とする。【選択図】なし
    • 要解决的问题:提供一种定向电磁钢板的评估方法和能够廉价且稳定地提供铁损性能优异的取向电磁钢板的定向电磁钢板的制造方法,同时高精度地预测铁损失败 在制造定向电磁钢板的步骤中的初始阶段的产品片。解决方案:在热轧步骤之后的任选制备步骤中的钢板用退火分离剂进行处理,然后对钢板进行处理 在1100℃以上的最高到达温度下进行二次再结晶退火,使用980℃以上且1025℃以下的纯化退火作为样品材料,其中使用抑制剂 包括在通过从区域的任意位置开始进行电解提取而获得的裂解物中 从样品表面30〜60μm,通过溶解指定量的样品材料等于或小于规定数量被确定为接受。
    • 2. 发明专利
    • High strength steel sheet
    • 高强度钢板
    • JP2014185359A
    • 2014-10-02
    • JP2013059930
    • 2013-03-22
    • Jfe Steel CorpJfeスチール株式会社
    • YAMASHITA TAKAKOSUGIHARA REIKOKONO TAKASHI
    • C22C38/00C21D9/46C22C38/06C22C38/14
    • PROBLEM TO BE SOLVED: To provide a high strength steel sheet suitable as a material for an automobile part without damaging surface appearance.SOLUTION: A high strength steel sheet contains, as a component composition, C: 0.05 to 0.35 mass%, Si: 0.50 to 3.00 mass%, Mn: 0.50 to 3.00 mass%, P: 0.050 mass% or less, S: 0.0050 mass% or less, Al: less than 0.100 mass%, Ca: 0.0010 mass% or more, the contents of Mn, Ca and S satisfying the formula (1) and the rest consisting of Fe and inevitable impurity. Formula (1): (Mn×Ca)/S≤3.00. The element symbols in the formula (1) represent the content (mass%) of each element.
    • 要解决的问题:提供适合作为汽车部件的材料的高强度钢板,而不会损伤表面外观。解决方案:高强度钢板含有C:0.05-0.35质量%,Si:0.50 至3.00质量%,Mn:0.50〜3.00质量%,P:0.050质量%以下,S:0.0050质量%以下,Al:小于0.100质量%,Ca:0.0010质量%以上,Mn, Ca和S满足式(1),其余由Fe和不可避免的杂质组成。 式(1):(Mn×Ca)/S≤3.00。 式(1)中的元素符号表示各元素的含量(质量%)。
    • 3. 发明专利
    • Cold-rolled steel sheet
    • 冷轧钢板
    • JP2012012669A
    • 2012-01-19
    • JP2010150890
    • 2010-07-01
    • Jfe Steel CorpJfeスチール株式会社
    • MEGA TETSUYASUGIHARA REIKOSHIMIZU TETSUOKANEKO SHINJIROYAMASHITA TAKAKO
    • C22C38/00C22C38/14
    • PROBLEM TO BE SOLVED: To provide a cold-rolled steel sheet that is used for an automotive steel sheet, an appliance steel sheet, a building member and the like, and has high in-plane rigidity.SOLUTION: On both surfaces of the steel sheet, {100} surface X-ray intensity of a direction parallel to the sheet surface is 2.5 or more in random intensity ratio. Much strain is accumulated on the steel sheet having such a texture, so that a projecting section of a height of 10-500 μm is formed on the steel sheet surface when strain of a strain amount of 5% or less is applied in one axial direction. As a result, the in-plane rigidity is improved. For example, when such a projecting section is formed on the steel sheet after processing in the case of an outer panel of an automobile, the shape does not collapse easily even when external force is applied after molding. In order to produce such a texture distribution, solid solution Ti is related. When Ti: 0.01-0.1%, and Ti*=(Ti%)-3.4×(N%)-1.5×(S%)-4×(C%), preferably, solid solution Ti is contained in a range establishing Ti*>0.007. Here, (Ti%), (N%), (S%) and (C%) show contents (mass%) of Ti, N, S and C.
    • 要解决的问题:提供一种用于汽车用钢板,电器钢板,建筑构件等的冷轧钢板,具有高的平面刚度。

      解决方案:在钢板的两个表面上,平行于片材表面的方向的ä100}表面的X射线强度随机强度比为2.5以上。 在具有这种组织的钢板上积累了大量应变,使得在一个轴向施加应变量为5%以下的应变时,在钢板表面上形成高度为10-500μm的突出部分 。 结果,面内刚度提高。 例如,在汽车的外板的情况下,在加工后的钢板上形成这样的突出部时,即使在成型后施加外力的情况下,也不易成形。 为了产生这样的纹理分布,固溶Ti是相关的。 当Ti:0.01-0.1%,Ti * =(Ti%) - 3.4×(N%) - 1.5×(S%)-4×(C%)时,优选固溶Ti包含在建立Ti *> 0.007。 这里,(Ti%),(N%),(S%)和(C%)表示Ti,N,S和C的含量(质量%)。(C)2012,JPO&INPIT

    • 4. 发明专利
    • Method for manufacturing ultra-low carbon steel having excellent material uniformity in thickness direction
    • 制造具有优异材料均质度的超低碳钢的方法
    • JP2011208194A
    • 2011-10-20
    • JP2010075229
    • 2010-03-29
    • Jfe Steel CorpJfeスチール株式会社
    • YAMASHITA TAKAKOHOSHI TORUSETO KAZUHIRO
    • C21D9/00C21D9/46C22C38/00C22C38/14
    • PROBLEM TO BE SOLVED: To provide a method for manufacturing ultra-low carbon steel having excellent material uniformity in the thickness direction, in which the ultra-low carbon steel with the constant carbon concentration from a surface layer to the inner side is manufactured while suppressing decarburization and carburization of the slab surface layer part when heating a slab during the hot rolling.SOLUTION: When the slab containing C of 0.0005-0.01 mass% is heated and hot-rolled to manufacture the ultra-low carbon steel, heating is performed while the value of the parameter A (=Cg/(Cs/100)-T/1,000), which is obtained by the slab heating temperature T(°C), the carbon activity Cg(atm) in the atmosphere of a heating furnace, and the carbon concentration Cs(mass%) contained in steel is set in an adequate range of (23.5≤A≤28.5).
    • 要解决的问题:提供一种制造在厚度方向上具有优异材料均匀性的超低碳钢的方法,其中制造从表面层到内侧具有恒定碳浓度的超低碳钢,同时抑制 在热轧期间加热板坯时,板坯表层部分的脱碳和渗碳。当将含有0.0005-0.01质量%的C的板坯加热并热轧制造超低碳钢时,进行加热 通过板坯加热温度T(℃)获得的参数A(= Cg /(Cs / 100)-T / 1,000)的值,加热炉的气氛中的碳活度Cg(atm) 钢中含有的碳浓度Cs(质量%)设定在(23.5≤A≤28.5)的适当范围内。
    • 8. 发明专利
    • High-tensile-strength steel material superior in formability and fatigue resistance, and manufacturing method therefor
    • 高强度钢材料耐磨性和耐疲劳性及其制造方法
    • JP2009293067A
    • 2009-12-17
    • JP2008146095
    • 2008-06-03
    • Jfe Steel CorpJfeスチール株式会社
    • TOYODA SHUNSUKEJODAI TETSUSHIYAMASHITA TAKAKOHASHIMOTO YUJIKAWABATA YOSHIKAZUSATO AKIO
    • C22C38/00C21D8/10C22C38/12C22C38/58
    • PROBLEM TO BE SOLVED: To provide a high-tensile-strength steel material which is suitable for an automotive structure member and is superior in formability and fatigue resistance after a cross section has been worked, and to provide a manufacturing method therefor. SOLUTION: This manufacturing method includes imparting such a heat history that a cumulative heat-treatment parameter ΣAi which is defined by the expression: ΣAi=ΣäTi×(20+log ti)} (wherein ti represents heat-treatment period of time (hr) in i-th step; and Ti represents heat-treatment temperature (K) in the i-th step) satisfies 28,000 to 21,000 in a temperature range of 850 to 1,150°C and 20,000 to 13,000 in a temperature range of 500 to 700°C, and imparting such a working of which the cumulative rolling reduction in a temperature range of 850 to 1,050°C is 87 to 97%, to a base material having a composition containing 0.03 to 0.24% C and at least 0.001 to 0.15% Nb. Thereby, the steel material acquires a structure in which Nbsp/Nbsol that is a ratio of an amount of Nb in precipitates having particle sizes of smaller than 20 nm to an amount of dissolving Nb is 0.8 to 8.0. COPYRIGHT: (C)2010,JPO&INPIT
    • 要解决的问题:提供一种适用于汽车结构件的高强度钢材,并且在加工截面之后的成型性和耐疲劳性优异,并提供其制造方法。 解决方案:该制造方法包括赋予由以下表达式定义的累积热处理参数ΣAi的热历史:ΣAi=ΣΔTi×(20 + log ti)}(其中,ti表示时间的热处理时间 (hr),Ti代表第i步骤中的热处理温度(K)在850〜1150℃的温度范围内为28,000〜21,000,在500℃的温度范围内为20,000〜13,000 至700℃,并将在850〜1050℃的温度范围内的累积压下率为87〜97%的工序赋予组成为0.03〜0.24%C,至少0.001〜 0.15%Nb。 因此,钢材获得了其中具有粒径小于20nm的析出物中的Nb的量与溶解Nb的量的Nb的比率为0.8-8.0的Nbsp / Nbsol的结构。 版权所有(C)2010,JPO&INPIT
    • 10. 发明专利
    • Evaluation method of steel plate excellent in welding heat affected part toughness
    • 焊接热影响部分韧性优良的钢板评价方法
    • JP2012127857A
    • 2012-07-05
    • JP2010280624
    • 2010-12-16
    • Kiyohito IshidaJfe Steel CorpJfeスチール株式会社清仁 石田
    • YAMASHITA TAKAKOMURAKAMI YOSHIAKIOI KENJIISHIDA KIYOHITO
    • G01N33/20C22C38/00C22C38/06C22C38/16
    • PROBLEM TO BE SOLVED: To provide an evaluation method of a steel plate for evaluating welded part toughness without performing a synthetic weld thermal cycle test.SOLUTION: According to the evaluation method for a steel plate, 0.01 mass % or less of Al, 0.5 to 2.0 mass % of Mn, 0.0005 to 0.0100 mass % of O, 0.0005 to 0.0100 mass % of S, 0.0010 to 0.0100 mass % of REM are contained, and content of O, content of Mn, and content of REM satisfy equation (1); content of S and content of Mn satisfy equation (2); a composition and the number of depositions per unit area of a steel plate where a remaining part has composition comprising Fe and unavoidable impurity are measured to perform evaluation by using REM content and Mn content of the deposition and proportion of the number of depositions to be oxysulphide among the deposition: (1) [Mn]×[O]×0.2≤[REM]≤[Mn]×[O]×1.2; (2) [S]≥0.00294/[Mn].
    • 要解决的问题:提供一种用于评价焊接部韧性的钢板的评价方法,而不进行合成焊接热循环试验。 < P>解决方案:根据钢板的评价方法,Al为0.01质量%以下,Mn为0.5〜2.0质量%,O为0.0005〜0.0100质量%,S为0.0005〜0.0100质量%,0.0010〜0.0100 含有REM的质量%,O含量,Mn含量和REM含量满足式(1); S含量和Mn含量满足式(2); 测量剩余部分含有Fe和不可避免的杂质的组成的钢板的单位面积的组成和沉积次数,通过使用REM含量和沉积的Mn含量和硫化物数量的比例进行评价 在沉积中:(1)[Mn]×[O]×0.2≤[REM]≤[Mn]×[O]×1.2; (2)[S]≥0.00294/ [Mn]。 版权所有(C)2012,JPO&INPIT