公开(公告)号：US5061325A

公开(公告)日：1991-10-29

申请号：US500939

申请日：1990-03-29

申请人： Yoshihiro Okamura ,  Seinosuke Yano ,  Ryota Yamaba ,  Hidetaka Chiba

发明人： Yoshihiro Okamura ,  Seinosuke Yano ,  Ryota Yamaba ,  Hidetaka Chiba

IPC分类号： C21D8/02 ,  C21D8/00 ,  C22C38/00 ,  C22C38/08 ,  C22C38/16

CPC分类号： C21D8/00 ,  C22C38/08 ,  C22C38/16

摘要： A method of high tension steel having superior weldability and low temperature toughness, comprises the steps of preparing a steel billet having a composition consisting, by weight, of 0.02 to 0.05% C, 0.02 to 0.5% Si, 0.4 to 1.5% Mn, 0.5 to 4.0% Ni, 0.20 to 1.5% Mo, 0.005 to 0.03% Ti, 0.01 to 0.08% Al, not more than 0.0002% B, 0.5 to 2.0% Cu, not more than 0.01% N, and the balance Fe and incidental impurities; heating said steel billet to a temperature of 900.degree. C. to 1000.degree. C.; hot-rolling the heated steel billet first at a rolling reduction of 30 to 70% in a temperature range in which austenite recrystallizes and then at a rolling reduction of 20 to 60% in another temperature range in which austenite does not recrystallize; hardening the hot-rolled billet by water-cooling from a temperature not lower than the Ar.sub.3 transformation point and terminating the cooling at a temperature not higher than 250.degree. C.; and tempering the hardened billet at a temperature which is not higher than the Ac.sub.1 transformation point.

摘要翻译： 具有优异的焊接性和低温韧性的高张力钢的方法包括以下步骤：制备具有重量0.02至0.05％C，0.02至0.5％Si，0.4至1.5％Mn，0.5 至4.0％的Ni，0.20〜1.5％的Mo，0.005〜0.03％的Ti，0.01〜0.08％的Al，不大于0.0002％的B，0.5〜2.0％的Cu，0.01％以下的N，余量为Fe和杂质 ; 将所述钢坯加热到900℃至1000℃的温度; 在奥氏体再结晶的温度范围内，然后在奥氏体不再结晶的另一个温度范围内的压下率为20〜60％的温度范围，首先将加热钢坯热轧30〜70％ 通过水冷从不低于Ar3相变点的温度使热轧钢坯硬化，并在不高于250℃的温度下终止冷却。 并在不高于Ac1相变点的温度下回火硬化的钢坯。

公开(公告)号：US5037493A

公开(公告)日：1991-08-06

申请号：US492924

申请日：1990-03-13

申请人： Yukio Tomita ,  Ryota Yamaba

发明人： Yukio Tomita ,  Ryota Yamaba

IPC分类号： C21D3/06 ,  C21D8/12

CPC分类号： C21D3/06 ,  C21D8/1222

摘要： A method of producing non-oriented magnetic steel plate that comprises hot-rolling high-purity steel and adjusting the grain size together with the dehydrogenation treatment to produce a uniform ferrite grain diameter and impart uniform magnetic properties in a low magnetic field through the thickness direction.

公开(公告)号：US4988393A

公开(公告)日：1991-01-29

申请号：US453141

申请日：1989-12-12

申请人： Ryota Yamaba ,  Yukio Tsuda ,  Atsuo Tanaka ,  Keiichi Hattori

发明人： Ryota Yamaba ,  Yukio Tsuda ,  Atsuo Tanaka ,  Keiichi Hattori

IPC分类号： C21D1/18 ,  C21D8/02 ,  C22C38/04

CPC分类号： C21D8/0226 ,  C21D1/18 ,  C22C38/04

摘要： High-strength steel having a tensile strength of 80 kgf/mm.sup.2 or more is produced by one-line quenching or on-line quenching and tempering. The steel has also excellent low-temperature toughness and excellent weldability, which makes high temperature preheating unnecessary prior to welding. The composition is: C=0.04% to 0.11%; Si.ltoreq.1.0%; Mn=0.5% to 2.00%, Mo=0.10% to 1.0%, Nb=0.005% to 0.05% B=0.0009% to 0.0012% Al.ltoreq.0.1%; and N.ltoreq.0.0060%.

摘要翻译： 抗拉强度为80kgf / mm2以上的高强度钢通过单线淬火或在线淬火回火来制造。 该钢还具有优异的低温韧性和优异的焊接性，这使得在焊接之前不需要高温预热。 组成为：C = 0.04％至0.11％; Si <1.0％; Mn = 0.5％〜2.00％，Mo = 0.10％〜1.0％，Nb = 0.005％〜0.05％B = 0.0009〜0.0012％Al≤0.1％ 和N <= 0.0060％。

公开(公告)号：US4950336A

公开(公告)日：1990-08-21

申请号：US368031

申请日：1989-06-19

申请人： Yukio Tomita ,  Ryota Yamaba ,  Yukio Tsuda ,  Katsuyoshi Yamanaka ,  Tatsuya Kumagai

发明人： Yukio Tomita ,  Ryota Yamaba ,  Yukio Tsuda ,  Katsuyoshi Yamanaka ,  Tatsuya Kumagai

IPC分类号： C21D3/06 ,  C21D8/12

CPC分类号： C21D8/1222 ,  C21D3/06

摘要： A method of producing non-oriented magnetic steel heavy plate that has good magnetic properties in a low magnetic field that comprises hot-rolling high-purity steel, adjusting the crystal grain size and dehydrogenation treatment, whereby the a uniform ferrite grain diameter is imparted to the steel.

公开(公告)号：US5827379A

公开(公告)日：1998-10-27

申请号：US785717

申请日：1997-01-17

申请人： Yoshihiro Okamura ,  Ryota Yamaba ,  Tomoya Koseki ,  Ichiro Nakagawa

发明人： Yoshihiro Okamura ,  Ryota Yamaba ,  Tomoya Koseki ,  Ichiro Nakagawa

IPC分类号： C21D1/18 ,  C21D8/02 ,  C21D6/00

CPC分类号： C21D8/0205 ,  C21D1/185 ,  C21D8/0263

摘要： An extra high tensile steel having an excellent stress corrosion cracking resistance in sea water and a yield strength of 1080 MPa or more is provided. A slab comprising, in terms of % by weight, 0.04 to 0.09% of C, 0.01 to 0.10% of Si, 0.05 to 0.65% of Mn, 8.0 to 11.0% of Ni, 0.5 to 1.5% of Mo, 0.2 to 1.5% of Cr, 0.02 to 0.20% of V and 0.01 to 0.08% of Al with the balance consisting of iron and unavoidable impurities is heated to a temperature between 1000.degree. C. and 1250.degree. C., hot rolled at a temperature of Ar' point or above, air-cooled, reheated at a rate of 120.degree. C./min or less to a temperature region of from (A.sub.C3 point--40.degree. C.) to (A.sub.C3 point+40.degree. C.), quenched and subsequently tempered at a temperature of the A.sub.C1 point or below.

摘要翻译： 提供了一种在海水中具有优异的耐应力腐蚀开裂性和1080MPa以上的屈服强度的超高强度钢。 一种板坯，以重量％计，C：0.04〜0.09％，Si：0.01〜0.10％，Mn：0.05〜0.65％，Ni：8.0〜11.0％，Mo：0.5〜1.5％，Mo：0.2〜1.5％ 的Cr，0.02〜0.20％的V和0.01〜0.08％的Al余量由铁和不可避免的杂质组成的混合物加热至1000℃至1250℃的温度，在Ar'点的温度下热轧 或以上，空气冷却，以120℃/分钟以下的速度加热至（AC3-40℃）至（AC3点+ 40℃）的温度区域，淬火并随后在 AC1点以下的温度。

公开(公告)号：US5447581A

公开(公告)日：1995-09-05

申请号：US144927

申请日：1993-10-28

申请人： Yoshihiro Okamura ,  Ryota Yamaba

发明人： Yoshihiro Okamura ,  Ryota Yamaba

IPC分类号： C21D1/18 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/44 ,  C22C38/46 ,  C22C38/50

CPC分类号： C22C38/44 ,  C21D6/001 ,  C21D8/0205 ,  C22C38/46 ,  C21D1/18 ,  C21D2211/008

摘要： An extra high tensile steel having an excellent stress corrosion cracking resistance and a yield strength of 1080 MPa or more is provided. A slab comprising, in terms of % by weight, 0.03 to 0.08% of C, 0.01 to 0.10% of Si, 0.05 to 0.65% of Mn, 8.0 to 11.0% of Ni, 0.5 to 1.5% of Mo, 0.2 to 1.5% of Cr, 0.02 to 0.20% of V and 0.01 to 0.08% of Al with the balance consisting of iron and unavoidable impurities is heated to a temperature between 1000.degree. C. and 1250.degree. C., hot-rolled in an austenite recrystallization temperature region with a reduction ratio of 30 to 70%, subsequently rolled in an austenite nonrecrystallization temperature region with a reduction ratio of 20 to 60%, subjected to roll finishing, water-cooled from a temperature of 600.degree. C. or above, reheated to so as to have an area ratio of non-diffusion type reverse transformed austenite grains of 40 to 80% and an area ratio of diffusion type reverse transformed austenite grains of 20 to 60%, quenched and then tempered at a temperature of A.sub.c1 point or below.

摘要翻译： 提供了具有优异的耐应力腐蚀开裂性和1080MPa以上的屈服强度的超高张力钢。 一种板坯，其以重量％计，C：0.03〜0.08％，Si：0.01〜0.10％，Mn：0.05〜0.65％，Ni：8.0〜11.0％，Mo：0.5〜1.5％，Mo：0.2〜 的Cr，0.02〜0.20％的V和0.01〜0.08％的Al，余量由铁和不可避免的杂质构成，加热到1000〜1250℃的温度，在奥氏体再结晶温度区域 减压率为30〜70％，随后在奥氏体非再结晶温度区域以20〜60％的压下率进行轧制，进行辊精加工，从600℃以上的水冷却，再加热至 为了使扩散型反向转变奥氏体晶粒的面积比为40〜80％，扩散型反向转变奥氏体晶粒的面积比为20〜60％，在Ac1点以下的温度下淬火然后回火。

公开(公告)号：US5062905A

公开(公告)日：1991-11-05

申请号：US567142

申请日：1990-08-14

申请人： Yukio Tomita ,  Ryota Yamaba ,  Tatsuya Kumagai

发明人： Yukio Tomita ,  Ryota Yamaba ,  Tatsuya Kumagai

IPC分类号： C21D3/06 ,  C21D8/12

CPC分类号： C21D3/06 ,  C21D8/1222 ,  C21D8/1261

摘要： A method of producing non-oriented magnetic steel plate having high magnetic flux density in a low magnetic field and uniform magnetic properties through the thickness direction, comprising selection of a heating temperature and finish rolling temperature to coarsen the size of the austenite grains and prevent refinement of the grain size in the rolling process, and annealing the steel after it has been rolled.