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1. 发明授权

US6063214A Method of producing high-strength steel sheet used for can 失效
标题翻译：生产用于罐头的高强度钢板的方法
公开(公告)号：US6063214A
公开(公告)日：2000-05-16
申请号：US287473
申请日：1994-08-08
申请人： Chikako Fujinaga , Akio Tosaka , Toshiyuki Kato , Kaku Sato , Hideo Kuguminato , Yoshihiro Okawa
发明人： Chikako Fujinaga , Akio Tosaka , Toshiyuki Kato , Kaku Sato , Hideo Kuguminato , Yoshihiro Okawa
IPC分类号： C21D8/02 , C21D8/04
CPC分类号： C21D9/48 , C21D8/0226 , C21D8/0236 , C21D8/0436 , C21D8/0442 , C21D8/0473 , C22C38/004 , C21D8/0268
摘要： A method of producing a steel sheet useful for making cans. The method steps include hot-rolling a slab consisting of about 0.0005 to 0.01 wt % C, about 0.001 to 0.04 wt % N (the total of C and N is at least about 0.008 wt %), about 0.05 to 2.0 wt % Mn, about 0.005 wt % or less Al, about 0.01 wt % or less O at a finish rolling temperature within a temperature range of about the Ar.sub.3 point to about 950.degree. C., coiling the rolled material at a temperature range of about 400 to 600.degree. C., cold rolling the material, continuously annealing the material at a temperature higher than the recrystallization temperature, and then temper-rolling the material. The steel sheet exhibits good workability during can making and which can be formed into a can having high strength.
摘要翻译：一种制造用于制造罐头的钢板的方法。方法步骤包括热轧由约0.0005至0.01重量％的C，约0.001至0.04重量％的N（C和N的总和至少约0.008重量％），约0.05至2.0重量％的Mn，约0.005重量％以下的Al，约0.01重量％以下的O，在约Ar3点〜约950℃的温度范围内的精轧温度下，在约400〜600℃的温度范围内卷取轧制材料 C.冷却材料，在高于再结晶温度的温度下对材料进行连续退火，然后对材料进行调质。钢板在制罐时表现出良好的加工性，并且可以形成具有高强度的罐。

2. 发明授权

US5725697A Method of manufacturing cold-rolled can steel sheet having less planar anisotropy and good workability 失效
标题翻译：制造平面各向异性小，加工性好的冷轧钢板的制造方法
公开(公告)号：US5725697A
公开(公告)日：1998-03-10
申请号：US360348
申请日：1994-12-21
申请人： Chikako Fujinaga , Akio Tosaka , Toshiyuki Kato , Kaku Sato , Hideo Kuguminato
发明人： Chikako Fujinaga , Akio Tosaka , Toshiyuki Kato , Kaku Sato , Hideo Kuguminato
IPC分类号： C21D8/04 , C22C38/12
CPC分类号： C22C38/12 , C21D8/0436 , C21D8/0426 , C21D8/0468
摘要： A method of manufacturing a cold-rolled can steel sheet having less planar anisotropy and achieving good workability. Rough-rolling is first performed on a continuously-cast slab. The slab has a composition essentially consisting of: C: 0.004 wt % or lower; Mn: 0.05-0.5 wt %; P: 0.02 wt % or lower; Al: 0.005-0.07 wt %; N: 0.004 wt % or lower; and Nb: 0.001-0.018 wt %, the rest being Fe and unavoidable impurities. A resultant sheet bar is then subjected to hot rolling which is completed at a finishing rolling temperature at an Ar.sub.3 transformation point or higher. The resultant sheet bar is coiled at a temperature range from 450.degree.-700.degree. C. Subsequently, the resultant sheet bar undergoes primary cold rolling before continuous annealing, which is performed at a recrystallization temperature or higher, and secondary cold rolling. The primary and secondary cold rolling are respectively performed at reduction ratios satisfying the following conditions of: 88%.gtoreq.CR.sub.1 %+0.36.times.CR.sub.2 .ltoreq.105% wherein CR.sub.1 : reduction ratio of the primary cold rolling CR.sub.2 : reduction ratio of the secondary cold rolling
摘要翻译：制造平面各向异性小的冷轧钢板的制造方法，加工性良好。首先在连续铸造的板坯上进行粗轧。板坯的组成基本上由以下组成：C：0.004重量％以下; Mn：0.05〜0.5重量％ P：0.02重量％以下; Al：0.005-0.07重量％ N：0.004重量％以下; 和Nb：0.001-0.018重量％，其余为Fe和不可避免的杂质。然后对得到的薄板坯进行在Ar3相变点以上的精轧条件下完成的热轧。所得板坯在450〜-90℃的温度范围内卷绕。接着，在再结晶温度以上进行二次冷轧，连续退火前进行一次冷轧。一次冷轧和二次冷轧分别以满足以下条件的压下率进行：88％> = CR1％+ 0.36×CR2 <105％其中CR1：二次冷轧CR2的减速比：次级冷轧

3. 发明授权

US5587027A Method of manufacturing canning steel sheet with non-aging property and superior workability 失效
标题翻译：制造具有不老化性能和优良加工性能的罐头钢板的方法
公开(公告)号：US5587027A
公开(公告)日：1996-12-24
申请号：US389045
申请日：1995-02-15
申请人： Akio Tosaka , Chikako Fujinaga , Toshiyuki Kato , Kaku Sato , Hideo Kuguminato
发明人： Akio Tosaka , Chikako Fujinaga , Toshiyuki Kato , Kaku Sato , Hideo Kuguminato
IPC分类号： C21D3/04 , C21D8/04 , C22C38/00 , C22C38/04 , C22C38/06 , C21D8/00
CPC分类号： C22C38/004 , C21D8/0473 , C22C38/002 , C22C38/04 , C21D3/04 , C21D8/0426
摘要： A method for manufacturing a canning steel sheet with non-aging property and superior workability uses, as a starting material, an ultra-low-carbon steel slab composed of from 0.0015% to 0.0100% by weight C, up to 0.20% by weight Si, from 0.10% to 1.20% by weight Mn, from 0.02% to 0.10% by weight Al, from 0.005% to 0.040% by weight P, up to 0.015% by weight S, up to 0.005% by weight N, and balance iron and unavoidable impurities. The manufacturing method includes hot rolling the steel, cold rolling the steel at a reduction ratio not less than 70% after pickling, and recrystallization annealing the steel by using a continuous annealing furnace in an atmosphere having a hydrogen content not less than 3% and a dew point not lower than -20.degree. C. at a temperature not lower than 730.degree. C. so that the content of remained C in the steel is kept less than 0.0015% by weight. At least one element selected from Nb, Ti and B may be added in predetermined amounts to the above composition. The steel sheet suitable for canning is efficiently manufactured by a continuous annealing process.
摘要翻译：制造具有非时效性和优良加工性的罐头钢板的制造方法使用由0.0015-0.0100重量％C，至多0.20重量％的Si组成的超低碳钢板坯作为原料，，0.10重量％至1.20重量％的Mn，0.02重量％至0.10重量％的Al，0.005重量％至0.040重量％的P，至多0.015重量％的S，至多0.005重量％的N，余量为和不可避免的杂质。该制造方法包括对钢进行热轧，酸洗后以不低于70％的压下量进行冷轧，在氢含量不低于3％的气氛中使用连续退火炉，对钢进行再结晶退火，在不低于730℃的温度下露点不低于-20℃，使得钢中残留C的含量保持在0.0015重量％以下。选自Nb，Ti和B中的至少一种元素可以以上述组成加入预定量。通过连续退火工艺有效地制造适于罐装的钢板。

4. 发明授权

US5534089A Method of manufacturing small planar anisotropic high-strength thin can steel plate 失效
标题翻译：制造小平面各向异性高强度薄罐钢板的方法
公开(公告)号：US5534089A
公开(公告)日：1996-07-09
申请号：US360250
申请日：1994-12-20
申请人： Chikako Fujinaga , Akio Tosaka , Toshiyuki Kato , Kaku Sato
发明人： Chikako Fujinaga , Akio Tosaka , Toshiyuki Kato , Kaku Sato
IPC分类号： C21D8/04 , C22C38/00 , C21D8/02
CPC分类号： C21D8/0426 , C22C38/001 , C21D8/0436 , C21D8/0473 , C21D8/0478
摘要： A method of manufacturing a small planar anisotropic high-strength can steel plate. Hot-rolling is first performed on a steel slab at an Ar.sub.3 transformation point or higher to obtain hot rolled steel strip. The slab has a composition which essentially consists of and which satisfies the conditions of: C.ltoreq.0.004%, Si.ltoreq.0.02%, Mn=0.5%-3%, P.ltoreq.0.02%, Al=0.02%-0.05%, 0.008%.ltoreq.N.ltoreq.0.024%, and the rest being Fe and unavoidable impurities, wherein the conditions have the relationship of:Al%/N%>2. Then, the resultant strip is cooled at a cooling rate of 10.degree. C./s or higher so as to reach a temperature of 650.degree. C. or lower. The resultant strip is further coiled at a temperature in a range of from 550.degree. C. to 400.degree. C. Cold-rolling is performed on the resultant strip at a reduction ratio of 82% or higher preceded by removing a scale to obtain cold rolled steel strip. Subsequently, continuous annealing is performed on the resultant cold rolled steel strip at a recrystallization temperature or higher, being followed by temper-rolling.
摘要翻译：一种制造小型平面各向异性高强度钢板的方法。首先在Ar3相变点以上的钢坯上进行热轧，得到热轧钢带。该板坯具有基本上由以下条件构成的组成：C≤0.004％，Si <0.02％，Mn = 0.5％-3％，P <= 0.02％，Al = 0.02％ 0.05％，0.008％，N = 0.024％，其余为Fe和不可避免的杂质，其中条件具有以下关系：Al％/ N％> 2。然后，以10℃/ s以上的冷却速度冷却所得到的带材，达到650℃以下的温度。所得到的带材在550℃至400℃的温度下进一步盘绕。在所得到的带材上以82％或更高的压下率进行冷轧，然后除去水垢以获得冷轧钢带。随后，在所得到的冷轧钢带上，在再结晶温度以上进行连续退火，随后进行回火处理。

5. 发明授权

US5759306A Method for making a steel sheet suitable as a material for can making 失效
标题翻译：制造适合作为制造材料的钢板的方法
公开(公告)号：US5759306A
公开(公告)日：1998-06-02
申请号：US613879
申请日：1996-03-11
申请人： Akio Tosaka , Kaneharu Okuda , Toshiyuki Kato , Hideo Kuguminato
发明人： Akio Tosaka , Kaneharu Okuda , Toshiyuki Kato , Hideo Kuguminato
IPC分类号： C21D8/04 , C21D9/46 , C22C38/00 , C22C38/06 , C21D8/02
CPC分类号： C21D8/0426 , C22C38/00 , C21D8/0436
摘要： A method is provided for making a steel sheet suitable as a can material. The method includes a step for hot rolling a steel slab to a strip having a thickness of less than about 1.2 mm, a step for coiling the strip into a coil at a temperature range between about 600.degree. and 750.degree. C., a step for pickling the coil with an acid, and a step for cold rolling the coil at a rolling reduction rate of about 50 to 90 percent, wherein the steel slab contains about 0.0020 weight percent or less of carbon, about 0.020 weight percent or less of silicon, about 0.50 weight percent or less of manganese, about 0.020 weight percent or less of phosphorus, about 0.010 weight percent or less of sulfur, about 0.150 weight percent or less of aluminum, about 0.0050 weight percent or less of nitrogen, and the balance iron and incidental impurities. A steel sheet suitable as a can material is also provided by this method.
摘要翻译：提供一种制造适合作为罐头材料的钢板的方法。该方法包括将钢坯热轧成厚度小于约1.2mm的钢带的步骤，将钢带卷绕到线圈中在约600℃至750℃的温度范围内的步骤，步骤用酸洗线圈，以约50〜90％的压下率冷轧线圈的步骤，其中钢坯含有约0.0020重量％以下的碳，约0.020重量％以下的硅，约0.50重量％以下的锰，约0.020重量％以下的磷，约0.010重量％以下的硫，约0.150重量％以下的铝，约0.0050重量％以下的氮，余量为附带杂质。也可以通过该方法提供适合于罐头材料的钢板。

6. 发明授权

US06171416B2 Method of producing can steel strip 有权
标题翻译：钢带生产方法
公开(公告)号：US06171416B2
公开(公告)日：2001-01-09
申请号：US09426886
申请日：1999-10-26
申请人： Makoto Aratani , Yukio Kobata , Hideo Kuguminato , Akio Tosaka , Masatoshi Aratani , Susumu Okada
发明人： Makoto Aratani , Yukio Kobata , Hideo Kuguminato , Akio Tosaka , Masatoshi Aratani , Susumu Okada
IPC分类号： C21D802
CPC分类号： C21D8/0426 , C21D2221/01 , C22C38/12
摘要： At least both ends of a sheet bar in the length direction, which is obtained by roughly rolling a steel slab including 0.1 wt % or less of C, 0.5 wt % or less of Si, 1.0 wt % or less of Mn, 0.1 wt % or less of P, 0.05 wt % or less of S, 0.20 wt % or less of Al, and 0.015 wt % or less of N, are heated so that the temperature at both ends of the sheet bar in the length direction is 15° C. or more higher than the temperature of the remainder of the sheet bar. The rolling finish temperature is Ar3+20° C. to Ar3+100° C. in both end portions of the sheet bar in the length direction, and Ar3+10° C. to Ar3+60° C. in the remainder, and the rolling finish temperature in the both end portions in the length direction is 10° C. or more higher than that of the remainder, so that a steel strip after cold rolling and annealing has r values within ±0.3 of the average r value, and &Dgr;r within ±0.2 of the average &Dgr;r in the region of 95% or more of each of the total length and total width of the steel strip.
摘要翻译：至少在长度方向的两端，通过大致轧制含有0.1重量％以下的C，0.5重量％以下的Si，1.0重量％以下的Mn，0.1重量％以下的钢板，或更少的P，0.05重量％以下的S，0.20重量％以下的Al和0.015重量％以下的N，被加热使得片材杆的长度方向的两端的温度为15度或更高于片材条的其余部分的温度。在板材的长度方向的两端部的轧制终轧温度为Ar3 + 20℃〜Ar3 + 100℃，其余为Ar3 + 10℃〜Ar3 + 60℃，长度方向两端部的轧制精加工温度比剩余部分的轧制温度高10℃以上，冷轧退火后的钢带的r值在平均r值的±0.3以内， DELTAr在平均DELTAr的±0.2内，在钢带的总长度和总宽度的95％或更多的区域中。

7. 发明授权

US06221180B1 Steel sheet for can and manufacturing method thereof 有权
标题翻译：罐用钢板及其制造方法
公开(公告)号：US06221180B1
公开(公告)日：2001-04-24
申请号：US09445404
申请日：1999-12-07
申请人： Akio Tosaka , Masatoshi Aratani , Osamu Furukimi , Hideo Kuguminato , Makoto Aratani , Yuji Miki
发明人： Akio Tosaka , Masatoshi Aratani , Osamu Furukimi , Hideo Kuguminato , Makoto Aratani , Yuji Miki
IPC分类号： C21D800
CPC分类号： C22C38/06 , C21D8/0273 , C21D2211/005 , C21D2211/009 , C22C38/002 , C22C38/04 , C22C38/14
摘要： 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.
摘要翻译：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。

8. 发明授权

US6042952A Extremely-thin steel sheets and method of producing the same 失效
标题翻译：极薄钢板及其制造方法
公开(公告)号：US6042952A
公开(公告)日：2000-03-28
申请号：US952013
申请日：1997-11-12
申请人： Makoto Aratani , Naotoshi Ryu , Hideo Kuguminato , Akio Tosaka , Kaneharu Okuda , Masatoshi Aratani , Susumu Okada
发明人： Makoto Aratani , Naotoshi Ryu , Hideo Kuguminato , Akio Tosaka , Kaneharu Okuda , Masatoshi Aratani , Susumu Okada
IPC分类号： B21B1/22 , B21B1/24 , B21B1/26 , B21B1/28 , B21B1/38 , B21B1/40 , B21B3/00 , B21B13/02 , B21B15/00 , B21B45/00 , C21D8/02 , C21D9/46 , C21D9/48 , C22C38/00 , C22C38/06 , C22C38/54 , C25D5/26
CPC分类号： B21B1/24 , C21D8/0226 , B21B1/26 , B21B1/28 , B21B1/40 , B21B13/023 , B21B15/0085 , B21B2001/228 , B21B2001/383 , B21B45/004 , C21D8/0278 , Y10T428/12722 , Y10T428/12854 , Y10T428/12972
摘要： A steel slab is rough-rolled into a sheet bar and butt-joined onto a preceding sheet bar and a widthwise end portion of the sheet bar is heated by means of an edge heater and then subjected to a continuous finish rolling through pair-cross rolls rolling on at least 3 stands to provide a hot rolled steel strip having a width of not less than 950 mm, a thickness of 0.5-2 mm and a crown within .+-.40 .mu.m, and the hot rolled steel strip is subjected to cold rolling, continuous annealing, temper rolling and, if necessary, plating treatment on the surface of the cold rolled steel strip, whereby there is obtained a steel sheet having an average thickness of not more than 0.20 mm and a width of not less than 950 mm, a thickness variation quantity in a widthwise direction is within .+-.4% of the average thickness in a region corresponding to not less than 95% of the width of the steel sheet as cold rolled and a hardness (HR30T) variation in the widthwise direction is within .+-.3 of an average hardness.
摘要翻译： PCT No.PCT / JP97 / 00826 Sec。 371日期1997年11月12日 102（e）日期1997年11月12日PCT 1997年3月14日PCT公布。公开号WO97 / 33706 日期1997年9月18日将钢坯粗轧成板坯，并对接在前面的板坯上，并且通过边缘加热器加热板坯的宽度方向端部，然后进行连续精轧通过在至少3个立场上滚轧的双向辊，提供宽度不小于950mm，厚度为0.5-2mm，表冠在+/-40μm内的热轧钢带，热轧对钢带进行冷轧，连续退火，回火轧制，如果需要，在冷轧钢带的表面进行电镀处理，得到平均厚度不大于0.20mm的钢板，宽度不小于950mm的宽度方向上的厚度变化量在对应于不低于冷轧钢板的宽度的95％的区域中的平均厚度的+/- 4％内，硬度（ HR30T）宽度方向的变化在+/- 3的平均硬度。

9. 发明授权

US06902632B2 High tensile strength cold rolled steel sheet having excellent strain age hardening characteristics and the production thereof 有权
标题翻译：具有优异的应变时效硬化特性的高抗拉强度冷轧钢板及其制造
公开(公告)号：US06902632B2
公开(公告)日：2005-06-07
申请号：US10341166
申请日：2003-01-13
申请人： Chikara Kami , Akio Tosaka , Kazunori Osawa , Shinjiro Kaneko , Takuya Yamazaki , Kaneharu Okuda , Takashi Ishikawa
发明人： Chikara Kami , Akio Tosaka , Kazunori Osawa , Shinjiro Kaneko , Takuya Yamazaki , Kaneharu Okuda , Takashi Ishikawa
IPC分类号： C21D8/02 , C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/22 , C22C38/38
CPC分类号： C21D8/0236 , C21D8/0226 , C21D8/0268 , C21D8/0273 , C21D2211/005 , C21D2211/008 , C22C38/001 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/22 , C22C38/38
摘要： The present invention presents a high tensile strength cold rolled steel sheet having excellent formability, impact resistance and strain age hardening characteristics, and the production thereof. As a specific means, a slab having a composition which contains, by mass %, 0.15% or less of C, 0.02% or less of Al, and 0.0050 to 0.0250% of N at N/Al of 0.3 or higher, and has N in a solid solution state at 0.0010% or more, is first hot rolled at the finish rolling delivery-side temperature of 800° C. or above, and is subsequently coiled at the coiling temperature of 750° C. or below to prepare a hot rolled plate. Then, after cold rolling, the hot rolled plate is continuously cooled at a temperature from the recrystallization temperature to 900° C. at a holding time of 10 to 120 seconds, and is cooled by primary cooling in which the hot rolled plate is cooled to 500° C. or below at a cooling rate of 10 to 300° C./s, and furthermore if necessary, by secondary cooling in which a residence time is 300 seconds or less in a temperature range of the primary cooling stopping temperature or below and 350° C. or higher. Provided is a steel sheet containing a ferritic phase having an average crystal grain size of 10 μm or less at an area ratio of 50% or more, and if necessary, a martensitic phase at an area ratio of 3% or more as a second phase.
摘要翻译：本发明提供一种成型性，耐冲击性和应变时效硬化特性优异的高拉伸强度的冷轧钢板及其制造方法。作为具体的方法，具有以质量％计含有0.15％以下C，0.02％以下Al，N / Al为0.0050〜0.0250％N，0.3以上N组成的板坯，在0.0010％以上的固溶状态下，首先在800℃以上的精轧条件下进行热轧，然后在卷取温度为750℃以下的条件下卷取，制成热轧板。然后，冷轧后，在10〜120秒的保持时间内，从再结晶温度至900℃的温度下连续冷却热轧板，通过一次冷却冷却，将热轧板冷却至 500℃以下，冷却速度为10〜300℃/秒，另外如果需要，通过在一次冷却停止温度以下的温度范围内停留时间为300秒以下的二次冷却和350℃以上。本发明提供一种钢板，其含有平均结晶粒径为10μm以下的面积比为50％以上的铁素体相，根据需要，作为第二相的面积比为3％以上的马氏体相。

10. 发明授权

US6110299A Steel sheet for double wound pipe and method of producing the pipe 失效
标题翻译：双卷管钢板及其生产方法
公开(公告)号：US6110299A
公开(公告)日：2000-08-29
申请号：US91745
申请日：1998-06-24
申请人： Akio Tosaka , Kaneharu Okuda , Masatoshi Aratani
发明人： Akio Tosaka , Kaneharu Okuda , Masatoshi Aratani
IPC分类号： C21D8/02 , C22C38/12 , C22C38/14
CPC分类号： C22C38/12 , C21D8/0236 , C22C38/14 , C21D8/0226 , C21D8/0268
摘要： A steel sheet for double-rolled tubes has excellent formability, and excellent strength and toughness after forming and heat treatment of a tube because of suppressed coarsening of the ferrite grain size and a method for making the same comprises: hot finish-rolling of a steel material containing C: 0.0005-0.020 wt %, and one or two of Nb: 0.003-0.040 wt %, and Ti: 0.005-0.060 wt % at a final temperature of 1,000-850.degree. C., coiling at 750.degree. C. or less, cold rolling, continuous annealing at 650.degree. C.-850.degree. C. for 20 seconds or less, and second cold-rolling at a rolling reduction rate of 20% or less, so that at least one of Nb and Ti is present in a solid solution state in an amount of 0.005 wt % or more, and the crystal grain size in the ferrite structure is in the range of 5 to 10 .mu.m.
摘要翻译： PCT No.PCT / JP97 / 04289 371日期：1998年6月24日 102（e）1998年6月24日PCT 1997年11月25日PCT PCT。公开号WO98 / 24942 日期1998年6月11日由于铁素体晶粒尺寸的抑制粗大化及其制造方法，双辊轧制钢板具有优异的成形性，而且管形成和热处理后的优异的强度和韧性包括：热处理在1000-850℃的最终温度下，将含有C：0.0005-0.020重量％，Nb：0.003-0.040重量％和Ti：0.005-0.060重量％中的一种或两种的钢材卷取在 750℃以下，冷轧，在650℃〜850℃下连续退火20秒以下，以20％以下的压下率进行第二次冷轧，使得至少一个 Nb和Ti以0.005重量％以上的量存在于固溶态中，铁素体结构中的结晶粒径在5〜10μm的范围内。

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