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11. 发明专利

JPS5641006A FEEDING METHOD FOR CAST SLAB TO HOT ROLLING PROCESS 失效
公开(公告)号：JPS5641006A
公开(公告)日：1981-04-17
申请号：JP11740279
申请日：1979-09-14
申请人： NIPPON STEEL CORP
发明人： YANAI TOSHIO , TANAKA SHIGENORI , EZAKA KAZUAKI , HAYANO SHIGERU , TAKEUCHI MASAHIRO
IPC分类号： B21B1/00 , B21B1/02 , B22D11/00 , B22D11/12 , C21D8/00 , C21D9/00
摘要： PURPOSE:To feed the hot rolling process with the cast billet possessing little surface and internal cracks, by adjusting the component of the molten steel at continuously casting the molten steel, and by maintaining the regularity between the continuous casting process and successive hot rolling process, through the specified heat treatment. CONSTITUTION:The component of the molten steel is adjusted to 0.01-0.25% C, 150ppm>O2, 0.03%>S, and 10

12. 发明专利

JPS5641005A FEEDING METHOD FOR CAST SLAB TO HOT ROLLING PASS 失效
公开(公告)号：JPS5641005A
公开(公告)日：1981-04-17
申请号：JP11740179
申请日：1979-09-14
申请人： NIPPON STEEL CORP
发明人： YANAI TOSHIO , TANAKA SHIGENORI , EZAKA KAZUAKI , HAYANO SHIGERU , TAKEUCHI MASAHIRO
IPC分类号： B21B1/00 , B21B1/46 , B22D11/00 , B22D11/12 , C21D8/00
摘要： PURPOSE:To attain the high productivity and energy saving while maintaining the regularity in the successive hot rolling passes, by continuously casting the molten steel containing C, O2, S, components with the adjusted Mn/S ratio, and by performing the hot edging pass under the specified strain rate and the pass condition. CONSTITUTION:The component of the molten steel is specified as follows; 0.01- 0.25% C, =10 Mn/S ratio. This molten steel is continuously cast to obtain the hot cast slab which is then subjected to the hot edging pass by the

13. 发明专利

JPS565920A HOT ROLLING METHOD FOR SLAB 失效
公开(公告)号：JPS565920A
公开(公告)日：1981-01-22
申请号：JP8075679
申请日：1979-06-28
申请人： NIPPON STEEL CORP
发明人： HAYANO SHIGERU , EZAKA KAZUAKI , TAKEUCHI MASAHIRO , TANAKA SHIGENORI , SUZUKI HIROO , WATANABE KAZUO
IPC分类号： B21B1/00 , B21B1/46 , B22D7/00 , B22D11/00 , B22D11/12 , C21D8/00
摘要： PURPOSE:To restrain the development of cracks in the surface or at inside of a slab of medium or low carbon steel during rolling, by the slow cooling of the molten steel, contg. C, O2, S at prescribed ratios, and having a specified ratio of Mn/S, from molting and solidifying state to a temp. just below a temp. at which it is kept hot, then by keeping the steel at the temp. for a prescribed time. CONSTITUTION:The above-described medium or low carbon steel is slowly cooled from molting and solidifying state to a temp. just below a temp. at which it is kept hot at a rate 1.0 deg.C/sec so as to accelerate the formation of spherical shape of laminar intergranular precipitated material, and to convert fine spherical precipitated material into coarse spherical material, in addition, to solidity nonmetallic inclusions and residual molten steel, thereby restraining the development of the cracks in the slab. In succession to the cooling, the slab is maintained in a temp. range 950-1,300 deg.C for >=10min, thereby spheroidizing similarly the laminar precipitated material which causes rolling cracks in the slab. The synergistic effect of the above-described slow cooling and keeping hot of the slab permits to achieve the purpose completely. The molten steel of medium or low carbon contg. 0.01-0.25% C, =6 Mn/S, is used as the raw material.

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