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1. 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。

2. 发明授权

US06702904B2 High tensile cold-rolled steel sheet having excellent strain aging hardening properties 有权
标题翻译：具有优异应变时效硬化性能的高强度冷轧钢板
公开(公告)号：US06702904B2
公开(公告)日：2004-03-09
申请号：US09980513
申请日：2001-10-24
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： C22C3804
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 &mgr;m 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。

3. 发明授权

US06899771B2 High tensile strength cold rolled steel sheet having excellent strain age hardening characteristics and the production thereof 有权
公开(公告)号：US06899771B2
公开(公告)日：2005-05-31
申请号：US10341165
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.

4. 发明授权

US07101445B2 Cold rolled steel sheet and galvanized steel sheet having strain age hardenability and method of producing the same 有权
标题翻译：具有应变时效淬透性的冷轧钢板和镀锌钢板及其制造方法
公开(公告)号：US07101445B2
公开(公告)日：2006-09-05
申请号：US10654775
申请日：2003-09-04
申请人： Chikara Kami , Akio Tosaka , Takuya Yamazaki
发明人： Chikara Kami , Akio Tosaka , Takuya Yamazaki
IPC分类号： C22C38/06 , C22C38/02 , C22C38/04
CPC分类号： C21D8/0436 , C21D1/185 , C21D8/0226 , C21D8/0236 , C21D8/0273 , C21D8/0426 , C21D8/0473 , C21D9/46 , C21D9/48 , C21D2211/005 , C21D2211/008 , C22C38/001 , C22C38/004 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , Y10T428/12493 , Y10T428/12799
摘要： An object of the present invention is to provide a cold-rolled steel sheet and an alloyed hot-dip galvanized steel sheet in which tensile strength is effectively increased by press forming and heat treatment while maintaining excellent deep drawability in press forming. Specifically, a steel composition contains less than 0.01% of C, 0.005 to 1.0% of Si, 0.01 to 1.0% of Mn, 0.005 to 0.050% of Nb, 0.005 to 0.030% of Al, 0.005 to 0.040% of N, 0.0005 to 0.0015% of B, 0.05% or less of P, and 0.01% or less of S, the balance substantially composed of Fe, in which the following equations (1) and (2) are satisfied: N %≧0.0015+14/93·Nb %+14/27·Al %+14/11·B % (1) C %≦(12/93)·Nb %. (2)
摘要翻译：本发明的目的是提供一种冷压钢板和合金化的热浸镀锌钢板，其中通过冲压成形和热处理有效地提高了拉伸强度，同时保持了冲压成形时的优异的深冲性。具体地说，钢组成包含C：0.01％以下，Si：0.005〜1.0％，Mn：0.01〜1.0％，Nb：0.005〜0.050％，Al：0.005〜0.030％，N：0.005〜0.040％ 0.0015％的B，0.05％以下的P和0.01％以下的S，余量基本上由Fe组成，其中满足以下等式（1）和（2）：<？在线公式描述 =“在线公式”end =“lead”？> N％> = 0.0015 + 14 / 93.Nb％+ 14 / 27.Al％+ 14 / 11.B％（1）<？ description =“In-line Formulas”end =“tail”？> <？in-line-formula description =“In-line Formulas”end =“lead”？> C％<=（12/93）.Nb％。（2）<？in-line-formula description =“In-line Formulas”end =“tail”？>

5. 发明授权

US07067023B2 Cold rolled steel sheet and galvanized steel sheet having strain age hardenability and method of producing the same 失效
标题翻译：具有应变时效淬透性的冷轧钢板和镀锌钢板及其制造方法
公开(公告)号：US07067023B2
公开(公告)日：2006-06-27
申请号：US10655361
申请日：2003-09-04
申请人： Chikara Kami , Akio Tosaka , Takuya Yamazaki
发明人： Chikara Kami , Akio Tosaka , Takuya Yamazaki
IPC分类号： C21D8/02
CPC分类号： C21D8/0436 , C21D1/185 , C21D8/0226 , C21D8/0236 , C21D8/0273 , C21D8/0426 , C21D8/0473 , C21D9/46 , C21D9/48 , C21D2211/005 , C21D2211/008 , C22C38/001 , C22C38/004 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , Y10T428/12493 , Y10T428/12799
摘要： An object of the present invention is to provide a cold-rolled steel sheet and an alloyed hot-dip galvanized steel sheet in which tensile strength is effectively increased by press forming and heat treatment while maintaining excellent deep drawability in press forming. Specifically, a steel composition contains less than 0.01% of C, 0.005 to 1.0% of Si, 0.01 to 1.0% of Mn, 0.005 to 0.050% of Nb, 0.005 to 0.030% of Al, 0.005 to 0.040% of N, 0.0005 to 0.0015% of B, 0.05% or less of P, and 0.01% or less of S, the balance substantially composed of Fe, in which the following equations (1) and (2) are satisfied: N%≧0.0015+14/93.Nb%+14/27.Al%+14/11.B% (1) C%≧(12/93).Nb% (2)
摘要翻译：本发明的目的是提供一种冷压钢板和合金化的热浸镀锌钢板，其中通过冲压成形和热处理有效地提高了拉伸强度，同时保持了冲压成形时的优异的深冲性。具体地说，钢组成包含C：0.01％以下，Si：0.005〜1.0％，Mn：0.01〜1.0％，Nb：0.005〜0.050％，Al：0.005〜0.030％，N：0.005〜0.040％ 0.0015％的B，0.05％以下的P和0.01％以下的S，余量基本上由Fe组成，其中满足以下等式（1）和（2）：<？在线公式描述 =“在线公式”end =“lead”？> N％> = 0.0015 + 14 / 93.Nb％+ 14 / 27.Al％+ 14 / 11.B％（1）<？描述=“内联公式”end =“tail”？> <？in-line-formula description =“In-line formula”end =“lead”？> C％> =（12/93）.Nb％ 2）<？in-line-formula description =“In-line Formulas”end =“tail”？>

6. 发明授权

US06695932B2 Cold-rolled steel sheet having excellent strain aging hardening properties and method for producing the same 有权
标题翻译：具有优异的应变时效硬化性能的冷轧钢板及其制造方法
公开(公告)号：US06695932B2
公开(公告)日：2004-02-24
申请号：US10031742
申请日：2002-01-23
申请人： Chikara Kami , Akio Tosaka
发明人： Chikara Kami , Akio Tosaka
IPC分类号： C22C3806
CPC分类号： C22C38/001 , C21D8/0226 , C21D8/0236 , C21D8/0242 , C21D8/0273 , C21D9/52 , C21D2211/005 , C21D2211/009 , C22C38/04 , C22C38/06 , Y02P10/212
摘要： The present invention provides a cold-rolled sheet exhibiting superior strain-aging hardenability which is suitable for use in automobile bodies, and a method for manufacturing the same. In particular, a slab including, by mass, not more than 0.15% carbon, not more than 0.02% Al, and 0.0050% to 0.0250% nitrogen in which Si+Mn/5+10P is adjusted to less than 0.44 and the ratio N/Al is adjusted to not less than 0.3 is hot-rolled at a finish-rolling delivery temperature FDT of not less than 800° C., and then coiled at a temperature of not more than 650° C. Next, after cold-rolling, continuous-annealing at a temperature between the recrystallization temperature and 950° C., primary cooling for cooling to a temperature zone of not more than 500° C., and overaging in the temperature zone of 350° C. to 450° C. for a retention time of not more than 30 seconds are performed to prepare a steel sheet containing not less than 0.0010% of solute nitrogen and having a structure in which the ferrite phase with the grain size of not more than 15 &mgr;m is included at a ratio of not less than 90%, the remainder of the structure being the pearlite phase. The resulting steel sheet has superior strain-aging hardenability in which the tensile strength is less than 440 MPa and the yield ratio is less than 70%.
摘要翻译：本发明提供一种适用于汽车车身的具有优异的应变时效淬透性的冷轧板及其制造方法。特别是，将Si + Mn / 5 + 10P调整为小于0.44的氮含量不超过0.15％，不大于0.02％Al和0.0050％〜0.0250％的氮的板坯，N / Al调整为0.3以上，在不低于800℃的精轧轧制温度FDT下进行热轧，然后在不高于650℃的温度下卷绕。接下来，冷轧后在再结晶温度和950℃之间的温度下进行连续退火，一次冷却冷却至不高于500℃的温度区域，在350℃至450℃的温度范围内进行过时效应。进行保持时间不超过30秒，以制备含有不少于0.0010％的固溶氮的钢板，并且具有其中包含不超过15μm的晶粒尺寸的铁素体相的结构不小于90％，其余的结构是珠光体相。得到的钢板具有优异的拉伸强度小于440MPa并且屈服比小于70％的应变时效淬透性。

7. 发明授权

US09708680B2 Hot rolled steel sheet for square column for building structural members 有权
公开(公告)号：US09708680B2
公开(公告)日：2017-07-18
申请号：US14391899
申请日：2012-04-12
申请人： Chikara Kami , Yuta Tamura , Takato Tamai , Shuji Kawamura
发明人： Chikara Kami , Yuta Tamura , Takato Tamai , Shuji Kawamura
IPC分类号： C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C21D8/02 , C22C38/00 , C22C38/02 , C21D6/00 , C21D9/46 , E04C3/32
CPC分类号： C21D8/0263 , C21D6/005 , C21D6/008 , C21D8/0226 , C21D9/46 , C21D2211/005 , C21D2211/009 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , E04C3/32
摘要： A hot rolled steel sheet for a square column for building structural members, the hot rolled steel sheet having a composition of, in terms of % by mass, C: 0.07 to 0.18%, Mn: 0.3 to 1.5%, P: 0.03% or less, S: 0.015% or less, N: 0.006% or less, Al: 0.01 to 0.06%, and the balance being Fe and unavoidable impurities, and having a microstructure that includes a primary phase constituted of ferrite and a second phase constituted of pearlite or pearlite and bainite, wherein a second phase frequency defined by equation (1) below is 0.20 to 0.42 and a mean crystal grain diameter of the primary phase and the second phase together is 7 to 15 μm Second phase frequency=(Number of second phase grains intersecting line segments of particular length)/(Number of primary phase grains and second phase grains intersecting line segments of particular length) (1).

8. 发明授权

US07879287B2 Hot-rolled steel sheet for high-strength electric-resistance welded pipe having sour-gas resistance and excellent weld toughness, and method for manufacturing the same 有权
标题翻译：具有耐酸气性和优异的焊接韧性的高强度电阻焊管热轧钢板及其制造方法
公开(公告)号：US07879287B2
公开(公告)日：2011-02-01
申请号：US11049836
申请日：2005-02-03
申请人： Takashi Kobayashi , Hiroshi Nakata , Chikara Kami , Toru Inazumi , Shuji Kawamura
发明人： Takashi Kobayashi , Hiroshi Nakata , Chikara Kami , Toru Inazumi , Shuji Kawamura
IPC分类号： C22C38/60 , C22C38/14 , C22C38/12 , C22C38/00 , C21D9/08 , C21D9/52 , C21D8/02
CPC分类号： C21D8/0226 , C22C38/02 , C22C38/04 , C22C38/08 , C22C38/12 , C22C38/16
摘要： A hot-rolled steel sheet for high-strength ERW pipes contains about 0.02% to about 0.06% C; about 0.05% to about 0.50% Si; about 0.5% to about 1.5% Mn; about 0.010% or less P; about 0.0010% or less S; about 0.01% to about 0.10% Al; about 0.01% to about 0.10% Nb; about 0.001% to about 0.025% Ti; about 0.001% to about 0.005% Ca; about 0.003% or less 0; and about 0.005% or less N, and at least one element selected from the group consisting of about 0.01% to about 0.10% V; about 0.01% to about 0.50% Cu; about 0.01% to about 0.50% Ni; and about 0.01% to about 0.50% Mo on the basis of mass. The group of C, Si, Mn, Cu, Ni, Mo, and V and the group of Ca, 0, and S satisfy specific relationships, and the microstructure of the steel sheet is composed of about 95% by volume or more bainitic ferrite.
摘要翻译：用于高强度ERW管的热轧钢板含有约0.02％至约0.06％的C; 约0.05％至约0.50％的Si; 约0.5％至约1.5％的Mn; 约0.010％以下P; 约0.0010％以下S; 约0.01％至约0.10％的Al; 约0.01％至约0.10％的Nb; 约0.001％至约0.025％的Ti; 约0.001％至约0.005％的Ca; 约0.003％以下0; 和约0.005％以下的N，以及选自约0.01％至约0.10％V的至少一种元素; 约0.01％至约0.50％的Cu; 约0.01％至约0.50％的Ni; 和基于质量的约0.01％至约0.50％的Mo。 C，Si，Mn，Cu，Ni，Mo和V组以及Ca，O和S组的组合满足特定关系，钢板的微结构由约95体积％以上的贝氏体铁素体。

9. 发明申请

US20050183798A1 Hot-rolled steel sheet for high-strength electric-resistance welded pipe having sour-gas resistance and exellent weld toughness, and method for manufacturing the same 有权
标题翻译：具有耐酸气性和良好的焊接韧性的高强度电阻焊管的热轧钢板及其制造方法
公开(公告)号：US20050183798A1
公开(公告)日：2005-08-25
申请号：US11049836
申请日：2005-02-03
申请人： Takashi Kobayashi , Hiroshi Nakata , Chikara Kami , Toru Inazumi , Shuji Kawamura
发明人： Takashi Kobayashi , Hiroshi Nakata , Chikara Kami , Toru Inazumi , Shuji Kawamura
IPC分类号： C22C38/04 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/50 , C22C38/54 , C21D9/08 , C21D9/52
CPC分类号： C21D8/0226 , C22C38/02 , C22C38/04 , C22C38/08 , C22C38/12 , C22C38/16
摘要： A hot-rolled steel sheet for high-strength ERW pipes contains about 0.02% to about 0.06% C; about 0.05% to about 0.50% Si; about 0.5% to about 1.5% Mn; about 0.010% or less P; about 0.0010% or less S; about 0.01% to about 0.10% Al; about 0.01% to about 0.10% Nb; about 0.001% to about 0.025% Ti; about 0.001% to about 0.005% Ca; about 0.003% or less 0; and about 0.005% or less N, and at least one element selected from the group consisting of about 0.01% to about 0.10% V; about 0.01% to about 0.50% Cu; about 0.01% to about 0.50% Ni; and about 0.01% to about 0.50% Mo on the basis of mass. The group of C, Si, Mn, Cu, Ni, Mo, and V and the group of Ca, 0, and S satisfy specific relationships, and the microstructure of the steel sheet is composed of about 95% by volume or more bainitic ferrite.
摘要翻译：用于高强度ERW管的热轧钢板含有约0.02％至约0.06％的C; 约0.05％至约0.50％的Si; 约0.5％至约1.5％的Mn; 约0.010％以下P; 约0.0010％以下S; 约0.01％至约0.10％的Al; 约0.01％至约0.10％的Nb; 约0.001％至约0.025％的Ti; 约0.001％至约0.005％的Ca; 约0.003％以下0; 和约0.005％以下的N，以及选自约0.01％至约0.10％V的至少一种元素; 约0.01％至约0.50％的Cu; 约0.01％至约0.50％的Ni; 和基于质量的约0.01％至约0.50％的Mo。 C，Si，Mn，Cu，Ni，Mo和V组以及Ca，O和S组的组合满足特定关系，钢板的微结构由约95体积％以上的贝氏体铁素体。

10. 发明申请

US20150292054A1 HOT ROLLED STEEL SHEET FOR SQUARE COLUMN FOR BUILDING STRUCTURAL MEMBERS AND METHOD OF MANUFACTURING THE SAME 有权
标题翻译：用于建筑结构构件的方柱的热轧钢板及其制造方法
公开(公告)号：US20150292054A1
公开(公告)日：2015-10-15
申请号：US14391899
申请日：2012-04-12
申请人： Chikara Kami , Yuta Tamura , Takato Tamai , Shuji Kawamura
发明人： Chikara Kami , Yuta Tamura , Takato Tamai , Shuji Kawamura
IPC分类号： C21D8/02 , C21D6/00 , C22C38/14 , E04C3/32 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D9/46 , C22C38/12
CPC分类号： C21D8/0263 , C21D6/005 , C21D6/008 , C21D8/0226 , C21D9/46 , C21D2211/005 , C21D2211/009 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , E04C3/32
摘要： A hot rolled steel sheet for a square column for building structural members, the hot rolled steel sheet having a composition of, in terms of % by mass, C: 0.07 to 0.18%, Mn: 0.3to 1.5%, P: 0.03% or less, S: 0.015% or less, N: 0.006% or less, Al: 0.01 to 0.06%, and the balance being Fe and unavoidable impurities, and having a microstructure that includes a primary phase constituted of ferrite and a second phase constituted of pearlite or pearlite and bainite, wherein a second phase frequency defined by equation (1) below is 0.20 to 0.42 and a mean crystal grain diameter of the primary phase and the second phase together is 7 to 15 μm Second phase frequency=(Number of second phase grains intersecting line segments of particular length)/(Number of primary phase grains and second phase grains intersecting line segments of particular length) (1).
摘要翻译：作为建筑构件的方柱用热轧钢板，以质量％计为C：0.07〜0.18％，Mn：0.3〜1.5％，P：0.03％的组成的热轧钢板或 S：0.015％以下，N：0.006％以下，Al：0.01〜0.06％，余量为Fe和不可避免的杂质，具有由铁素体构成的主相和由珠光体或珠光体和贝氏体，其中由下式（1）定义的第二相频率为0.20〜0.42，一次相和第二相的平均晶粒直径为7〜15μm第二相频率=（秒数相位晶粒与特定长度的线段相交）/（主相晶粒和第二相晶粒数量与特定长度的线段相交）（1）。

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