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1.发明公开
公开(公告)号：EP2980235A4
公开(公告)日：2017-01-18
申请号：EP14772647
申请日：2014-03-25
发明人： TASHIRO KIICHIROU , KATO TAKU , SATO SHINSUKE , MIYAKE TAKASHI , KAWANO HARUYA
CPC分类号： C22C38/58 , C21C7/04 , C21D8/0226 , C21D2211/004 , C22C38/14
摘要： A steel plate with excellent hydrogen-induced cracking resistance and toughness of the weld heat affected zone (HAZ toughness) and a steel pipe obtained using the steel plate are achieved. The steel plate is characterized to contain specified elements with the remainder consisting of iron and inevitable impurities, in which the ratio of Ca amount and S amount (Ca/S) is 2.0 or more, Ca amount, S amount, and O amount satisfy (Ca-1.25S)/O‰¤1.8, and, in a region from the surface to 5 mm depth in the plate thickness direction, Ca-based inclusions with 50 µm or more of the long diameter or long side are 2.0 pieces/mm 2 or less, and TiN with 300 nm or less of the long diameter or long side is 5×10 2 pieces/µm 2 or more.
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2.发明公开
公开(公告)号：EP3239319A4
公开(公告)日：2018-06-27
申请号：EP15873094
申请日：2015-12-22
发明人： TASHIRO KIICHIRO , KATO TAKU , OKA YUICHI , SATO SHINSUKE , KAWANO HARUYA , MIYAKE TAKASHI , KIMURA SEI
IPC分类号： C22C38/00 , C21C7/04 , C21D1/18 , C21D8/02 , C21D8/10 , C21D9/08 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/58
CPC分类号： C22C38/58 , C21C7/04 , C21D1/18 , C21D8/02 , C21D8/0226 , C21D8/0263 , C21D8/105 , C21D9/08 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16
摘要： A steel plate and a steel pipe with excellent hydrogen-induced cracking resistance are achieved. Further, the steel plate and steel pipe are achieved that can evaluate the hydrogen-induced cracking resistance based on the quality of an internal structure of a cast strip without executing a hydrogen-induced cracking test after rolling. The steel plate having the excellent hydrogen-induced cracking resistance satisfies the specified contents of C, Si, Mn, P, S, Al, Ca, N, and O, and further contains the specified content of one or more elements selected from the group consisting of REM and Zr, with the balance being iron and inevitable impurities. The steel plate is further characterized by that the ratio (Ca/S) of the Ca to the S is 2.0 or more, the Ca, the S, and the O satisfies the relationship of (Ca - 1.25S) /O ‰¤ 1.80, and a decrease in an amount of Ca obtained by subtracting a Ca concentration in a slab from a Ca concentration in a molten steel in a tundish is a threshold value Ca drop¸ or less, the threshold value Ca drop¸ being a maximum decrease in an amount of Ca that avoids the occurrence of hydrogen-induced cracking in the steel plate obtained by rolling the slab.
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3.发明公开
公开(公告)号：EP3239334A4
公开(公告)日：2018-06-27
申请号：EP15873097
申请日：2015-12-22
发明人： TASHIRO KIICHIRO , KATO TAKU , KAWANO HARUYA , OKA YUICHI , SATO SHINSUKE , KIMURA SEI , MIYAKE TAKASHI
IPC分类号： C22C38/00 , C21C7/04 , C21D1/18 , C21D8/02 , C21D8/10 , C21D9/08 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/58
CPC分类号： C22C38/14 , C21C7/04 , C21D1/18 , C21D8/02 , C21D8/0226 , C21D8/0263 , C21D8/105 , C21D9/08 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/16 , C22C38/58
摘要： A steel plate and a steel pipe with excellent hydrogen-induced cracking resistance are achieved. Further, the steel plate and steel pipe are achieved that can evaluate the hydrogen-induced cracking resistance based on the internal quality of a cast strip without performing a hydrogen-induced cracking test. The steel plate having the excellent hydrogen-induced cracking resistance satisfies the specified contents of C, Si, Mn, P, S, Al, Ca, N, and O, and further includes the specified content of one or more elements selected from the group consisting of REM and Zr, with the balance being iron and inevitable impurities. The steel plate is further characterized by that the ratio (Ca/S) of the Ca to the S is 2.0 or more; the Ca, the S, and the O satisfy the relationship of (Ca - 1.25S)/O ‰¤ 1.80; at a stage of a slab, a maximum segregated particle size and a number density of segregated particle having a predetermined diameter or more, at a center part in a thickness direction of the slab are set within respective ranges of the maximum segregated particle size and the number density of the segregated particle having the predetermined diameter or more, that avoid occurrence of hydrogen-induced cracking in a steel plate obtained by rolling the slab.
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4.发明公开
公开(公告)号：EP3239333A4
公开(公告)日：2018-06-27
申请号：EP15873096
申请日：2015-12-22
发明人： TASHIRO KIICHIRO , KATO TAKU , KAWANO HARUYA , OKA YUICHI , SATO SHINSUKE , KIMURA SEI , MIYAKE TAKASHI
IPC分类号： C22C38/00 , C21C7/04 , C21D1/18 , C21D8/02 , C21D8/10 , C21D9/08 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/58
CPC分类号： C22C38/14 , C21C7/04 , C21D1/18 , C21D8/02 , C21D8/0226 , C21D8/0263 , C21D8/105 , C21D9/08 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/16 , C22C38/58
摘要： A steel plate and a steel pipe having excellent hydrogen-induced cracking resistance and toughness are achieved. Further, the steel plate and steel pipe are achieved that can evaluate the hydrogen-induced cracking resistance based on the internal quality of a cast strip without performing a hydrogen-induced cracking test after rolling. The steel plate having the excellent hydrogen-induced cracking resistance and toughness satisfies the specified contents of C, Si, Mn, P, S, Al, Ca, N, and O, and further contains the specified content of one or more elements selected from the group consisting of REM and Zr, with the balance being iron and inevitable impurities. The steel plate is further characterized by that the ratio (Ca/S) of the Ca to the S is 2.0 or more; the Ca, the S, and the O satisfy the relationship of (Ca - 1.25S)/O ‰¤ 1.80; an Ar gas content in a steel is 0.50 µL/cm 3 or less; and a decrease in the amount of Ca obtained by subtracting a Ca concentration in a slab from a Ca concentration in a molten steel in a tundish is a threshold value Ca drop¸ or less, the threshold value Ca drop¸ being a maximum decrease in the amount of Ca that avoids the occurrence of hydrogen-induced cracking in the steel plate obtained by rolling the slab.
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5.发明公开
公开(公告)号：EP3239320A4
公开(公告)日：2018-06-27
申请号：EP15873095
申请日：2015-12-22
发明人： TASHIRO KIICHIRO , KATO TAKU , KAWANO HARUYA , OKA YUICHI , SATO SHINSUKE , KIMURA SEI , MIYAKE TAKASHI
IPC分类号： C22C38/00 , C21C7/04 , C21D1/18 , C21D8/02 , C21D8/10 , C21D9/08 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/58
CPC分类号： C22C38/58 , C21D1/18 , C21D8/02 , C21D8/0226 , C21D8/0263 , C21D8/105 , C21D9/08 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16
摘要： Provided are a steel plate and a steel pipe having excellent HIC resistance. Further, provided are the steel plate and steel pipe that can evaluate HIC resistance based on the internal quality of a cast strip without performing an HIC test. The steel plate having excellent HIC resistance satisfies the specified contents of C, Si, Mn, P, S, Al, Ca, N, and O, and further contains the specified content of one or more elements selected from the group consisting of REM and Zr, with the balance being iron and inevitable impurities. The steel plate is characterized by that the ratio (Ca/S) of the Ca to the S is 2.0 or more; the Ca, the S, and the O satisfy the relationship of (Ca - 1.25S)/O ‰¤ 1.80; and at a stage of a slab, the slab for the steel plate does not include a horizontal crack or include the horizontal crack having a maximum opening thickness of a threshold value t¸ or less, where the threshold value t¸ is a maximum opening thickness of a horizontal crack for avoiding the occurrence of hydrogen-induced cracking in the steel plate obtained by rolling the slab.
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