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1. 发明专利

JPH0751732A HOT ROLLING METHOD OF STEEL SHEET WITH SUPERIOR SURFACE PROPERTY 失效
公开(公告)号：JPH0751732A
公开(公告)日：1995-02-28
申请号：JP20782193
申请日：1993-08-23
申请人： KOBE STEEL LTD
发明人： OE KENICHI , KATO AIICHIRO , MORIMOTO SADAO , MIYAWAKI ATSUSHI , OBANYA YOSHIKAZU , FUJINO TAKANARI
IPC分类号： B21B1/22 , B21B45/08
摘要： PURPOSE:To perform a hot rolling of a steel sheet having a superior surface property without the generation of scale defects on the surface, red scale and cooling irregularity in a controlled cooling. CONSTITUTION:At least one descaling is performed with a high pressure water having an impact pressure of 38kgf/cm before the start of a roughing and also before the start of a finish rolling. In addition, in the finish rolling process 7, a hot rolling is performed with a pass schedule for a larger draft to give the limit value HS of the scale layer thickness such that the destruction of the scale layer is not caused in a roll bite at the time of rolling reduction. HS=a.gamma +b.gamma+c, where HS: limit value of scale layer thickness; gamma: rolling reduction; a, b, c: coefficient to be determined by kinds of steel and rolling temperature.

2. 发明专利

JPH0679337A MANUFACTURE OF STEEL PLATE 失效
公开(公告)号：JPH0679337A
公开(公告)日：1994-03-22
申请号：JP25587792
申请日：1992-08-31
申请人： KOBE STEEL LTD
发明人： OE KENICHI , KATO AIICHIRO , MIYAWAKI ATSUSHI , OBANYA YOSHIKAZU , FUJINO TAKANARI
IPC分类号： B21B45/00 , B21B45/08 , C21D8/02
摘要： PURPOSE:To provide a descaling method after heating and a predicting method for the secondary scale layer thickness to manufacture a steel plate excellent in surface property. CONSTITUTION:In a heating stage in a hot rolling process, the difference between the times when the front and rear sides of a skid part are exposed to a temperature >=900 deg.C is controlled within 15% of the time exposed to a temperature >=900 deg.C, the descaling nozzle is approached to the surface of the steel plate after it is extracted from a heating furnace to perform descaling, then, the thickness of the scale layer formed before the steel plate is bitten in the forging stage is predicted and the nozzle of the descaling device is approached to the steel plate to remove the scale so that the secondary scale layer thickness directly before it is bitten in comes below a definite value.

3. 发明专利

JPH09194934A COOLING METHOD FOR STEEL PLATE FOR UNIFORMIZING QUALITY 失效
公开(公告)号：JPH09194934A
公开(公告)日：1997-07-29
申请号：JP840196
申请日：1996-01-22
申请人： KOBE STEEL LTD
发明人： TANI NORITAKA , SUDO MASAKI , FUJINO TAKANARI , SUGA TOSHIAKI , SHIBATA MITSUAKI , ABE KENGO
IPC分类号： B21B45/02 , B21D1/00 , C21D8/02
摘要： PROBLEM TO BE SOLVED: To provide a cooling method for a steel plate, capable of reducing the occurrence of uneven cooling due to temp. deviation and inferior degree of flatness, uniformizing the quality in the steel plate, and securing superior degree of flatness, by straightening a hot rolled steel plate before cooling. SOLUTION: At the time of producing a steel plate by using hot rolling equipment having a cooling device and a straightening device on the rear side of a rolling mill, the quality is uniformized by straightening a hot rolled steel plate by means of the straightening device into flat state and then cooling it by means of the cooling device, in this cooling method for steel plate. Further, in this steel plate cooling method for uniformizing quality, hot rolling completion temp. is regulated o >=800 deg.C and cooling is started from a temp. not lower than the Ar3 transformation point after 1-3min from the completion of hot rolling and stopped at a temp. not higher than the bainitic transformation completion temp., and, after further cooling, the steel plate is straightened again by means of the straightening device into flat state.

4. 发明专利

JPH0751710A METHOD FOR SETTING PASS SCHEDULE IN THICK PLATE ROLLING 失效
公开(公告)号：JPH0751710A
公开(公告)日：1995-02-28
申请号：JP19849893
申请日：1993-08-10
申请人： KOBE STEEL LTD
发明人： MORIMOTO SADAO , OE KENICHI , KAJIURA SHIGEMI , FUJINO TAKANARI
IPC分类号： B21B37/00 , B21B37/38
摘要： PURPOSE:To provide a suitably setting method of the pass schedule of a next material in a shape adjusting pass of a thick plate rolling. CONSTITUTION:A pass schedule is set so that a set value C1 of outlet side plate crown of each pass and a set value h1 of outlet side plate thickness, which are calculated from a target value of outlet side plate crown and a target value of outlet side plate thickness in the final pass of a next material and a plate crown predicting model, and a rolling load predicting model, satisfy the relation not generating shape defects. When the actually measured value of the outlet side plate thickness in the final pass of the preceding material is defined as (a), the actually measured value of the outlet side plate crown in the same pass as (b), and the target value of the outlet side plate crown in the final pass of the next material as (c), the pass schedule of the next material is set so that the outlet side plate crown C1 and the outlet side plate thickness h1 of each pass satisfy the relation of C1=(b/a)Xh1+c-b.

5. 发明专利

JPH07178424A SETTING METHOD OF PASS SCHEDULE OF ROLLING OF STEEL SHEET 失效
公开(公告)号：JPH07178424A
公开(公告)日：1995-07-18
申请号：JP32848793
申请日：1993-12-24
申请人： KOBE STEEL LTD
发明人： MORIMOTO SADAO , OE KENICHI , KAJIURA SHIGEMI , FUJINO TAKANARI
IPC分类号： B21B37/00
摘要： PURPOSE:To prevent defect in the shape of a steel sheet in a connecting pass by comparing the variation in sheet crown ratio of a preceding rolled stock in the connecting pass with the upper and lower values of defective shape suppressing region and, when the variation is deviated, by correcting the sheet crown ratio on the outlet side in the final pass of the next rolled stock in accor dance with the amount of deviation. CONSTITUTION:The pass schedule A is set so that the variation in sheet crown ratio (the difference between the sheet crown ratio on the outlet side and the sheet crown ratio on the inlet side) in a shape adjusting pass satisfies the neutral value (i.e. 0%) in the defective shape suppressing region. Since the max. load of a rolling mill is forcedly imparted in the connecting pass, the variation in sheet crown ratio is increased to deviate from the defective shape suppressing region and defect in the shape of steel sheet is generated in this connecting pass. As shown in Fig. B, by correcting the sheet crown ratio on the outlet side of the final pass in the decreasing direction, the pass schedule is reset. In this way, the generation of defect in the shape of steel sheet in the next rolled stock in the stock in the connecting pass is eliminated.

6. 发明专利

JPH07124619A METHOD FOR CONTROLLING FIXED LENGTH OF VARIABLE THICKNESS PART FOR DIFFERENTIAL THICKNESS STEEL PLATE 失效
公开(公告)号：JPH07124619A
公开(公告)日：1995-05-16
申请号：JP27376693
申请日：1993-11-01
申请人： KOBE STEEL LTD
发明人： FUJINO TAKANARI , OBANYA YOSHIKAZU
IPC分类号： B21B37/24 , B21B1/38
摘要： PURPOSE:To provide a simple and highly precise method by which the length of a variable thickness part is kept constant without being influenced by the change of rolling conditions such as a rolling load. CONSTITUTION:In manufacturing a differential thickness plate 2 by a hot rolling process, the rolling speed at the time of pass for the differential thickness rolling is set based on an idle running distance from the arrival at a differential thickness point P to the actual change of a roll gap, on the releasing speed of the roll gap and on the releasing quantity of the roll gap; a differential thickness rolling is thereby performed; the roll gap is made larger simultaneously with the arrival at the differential thickness point P; and also the rotation of the rolling roll is stopped. As a result, the length of the differential thickness part is able to be kept constant.

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