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公开(公告)号：EP3006137A1
公开(公告)日：2016-04-13
申请号：EP14840879.2
申请日：2014-08-26
CPC分类号： B22D11/00 , B22D11/001 , C21D9/00 , C21D9/0081 , C21D2211/004 , C22C38/00 , C22C38/002 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/16
摘要： A primary object of the present invention is to provide a method for manufacturing Cu-Sn coexisting steel where a good quality of its surface is kept even if hot-rolled.
In the present invention, in a case where Cu-Sn coexisting steel is manufactured by continuous casting of molten steel that contains C: 0.04 to 0.20%, Si: 0.05 to 1.00%, Mn: 0.20 to 2.50%, P: no more than 0.05%, S: no more than 0.02%, Cu: 0.20 to 1.50% and Sn: 0.06 to 0.50% and further contains Al: 0.06 to 1.00% and Ni: 0.05 to 1.00% by mass, and Fe and impurities as the remainder, the composition of the molten steel is adjusted so as to satisfy [Al]/(3[Si] + [Mn]) ≥ 0.050, [Ni]/([Cu] + 5[Sn]) ≥ 0.10 and [Al]/[Ni] ≥ 0.20 if the content of an element X in the molten steel is represented as [X], an internal oxidation layer is formed by oxidizing a surface of a slab in a process of cooling the slab, and Al 2 O 3 is contained by composite oxides that are generated in the internal oxidation layer.-
2.发明公开
公开(公告)号：EP3135785A1
公开(公告)日：2017-03-01
申请号：EP15783239.5
申请日：2015-04-22
发明人： HASHIMURA, Masayuki , YAMAMOTO, Junya , MIZUKAMI, Kazumi , YOSHIDA, Naotsugu , MIYAZAKI, Masafumi , MIYAMOTO, Kenichiro
IPC分类号： C22C38/00 , B22D11/115 , B22D11/124 , C21C7/04 , C21C7/06 , C21C7/10 , C22C38/60
CPC分类号： C21D9/02 , B22D11/001 , B22D11/115 , B22D11/124 , C21C7/04 , C21C7/06 , C21C7/10 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/34 , C22C38/42 , C22C38/46 , C22C38/50 , C22C38/54 , C22C38/60
摘要： A spring steel according to the present embodiment has a chemical composition consisting of, in mass%, C: 0.4 to 0.7%, Si: 1.1 to 3.0%, Mn: 0.3 to 1.5%, P: equal to or less than 0.03%, S: equal to or less than 0.05%, Al: 0.01 to 0.05%, rare earth metal: 0.0001 to 0.002%, N: equal to or less than 0.015%, O: equal to or less than 0.0030%, Ti: 0.02 to 0.1%, and as optional elements, Ca, Cr, Mo, W, V, Nb, Ni, Cu, and B, with the balance being Fe and impurities. In the spring steel, the number of oxide inclusions having an equivalent circular diameter of equal to or greater than 5 µm is equal to or less than 0.2/mm 2 , the oxide inclusions each being one of an Al-based oxide, a complex oxide containing REM, O and Al, and a complex oxysulfide containing REM, O, S, and Al. Further, a maximum value among equivalent circular diameters of the oxide inclusions is equal to or less than 40 µm.
摘要翻译： 根据本实施方式的弹簧钢具有质量％C：0.4〜0.7％，Si：1.1〜3.0％，Mn：0.3〜1.5％，P：0.03％以下的化学组成， S：0.05％以下，Al：0.01〜0.05％，稀土金属：0.0001〜0.002％，N：0.015％以上，O：0.0030％以上，Ti：0.02〜 0.1％，作为任选的元素，Ca，Cr，Mo，W，V，Nb，Ni，Cu和B，余量为Fe和杂质。 在弹簧钢中，等效圆直径等于或大于5μm的氧化物夹杂物的数量等于或小于0.2 / mm 2，氧化物夹杂物各自为Al基氧化物，复合氧化物 含有REM，O和Al，以及含有REM，O，S和Al的复合氧硫化物。 此外，氧化物夹杂物的当量圆直径的最大值等于或小于40μm。
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公开(公告)号：EP3135785B1
公开(公告)日：2018-12-26
申请号：EP15783239.5
申请日：2015-04-22
发明人： HASHIMURA, Masayuki , YAMAMOTO, Junya , MIZUKAMI, Kazumi , YOSHIDA, Naotsugu , MIYAZAKI, Masafumi , MIYAMOTO, Kenichiro
IPC分类号： C22C38/60 , B22D11/00 , C21D9/02 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/24 , C22C38/28 , C22C38/32 , C22C38/34 , C22C38/42 , C22C38/46 , C22C38/50 , C22C38/54 , C22C38/08 , C22C38/26
CPC分类号： C21D9/02 , B22D11/001 , B22D11/115 , B22D11/124 , C21C7/04 , C21C7/06 , C21C7/10 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/34 , C22C38/42 , C22C38/46 , C22C38/50 , C22C38/54 , C22C38/60
摘要： A spring steel according to the present embodiment has a chemical composition consisting of, in mass%, C: 0.4 to 0.7%, Si: 1.1 to 3.0%, Mn: 0.3 to 1.5%, P: equal to or less than 0.03%, S: equal to or less than 0.05%, Al: 0.01 to 0.05%, rare earth metal: 0.0001 to 0.002%, N: equal to or less than 0.015%, O: equal to or less than 0.0030%, Ti: 0.02 to 0.1%, and as optional elements, Ca, Cr, Mo, W, V, Nb, Ni, Cu, and B, with the balance being Fe and impurities. In the spring steel, the number of oxide inclusions having an equivalent circular diameter of equal to or greater than 5 µm is equal to or less than 0.2/mm 2 , the oxide inclusions each being one of an Al-based oxide, a complex oxide containing REM, O and Al, and a complex oxysulfide containing REM, O, S, and Al. Further, a maximum value among equivalent circular diameters of the oxide inclusions is equal to or less than 40 µm.
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