WO2015141154A1 - High carbon steel hot rolling method - Google Patents
High carbon steel hot rolling method Download PDFInfo
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- WO2015141154A1 WO2015141154A1 PCT/JP2015/001069 JP2015001069W WO2015141154A1 WO 2015141154 A1 WO2015141154 A1 WO 2015141154A1 JP 2015001069 W JP2015001069 W JP 2015001069W WO 2015141154 A1 WO2015141154 A1 WO 2015141154A1
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- sheet bar
- temperature
- sheet
- tail end
- rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
Definitions
- the present invention relates to a method for hot rolling high carbon steel.
- the present invention relates to a hot rolling method in which a high carbon steel sheet bar is heated and finish-rolled by a heating device (hereinafter referred to as a sheet bar heater) installed on the entrance side of the finishing mill.
- a heating device hereinafter referred to as a sheet bar heater
- the high carbon steel as used in this specification refers to what is prescribed
- the hot rolling line is generally composed of a heating furnace 1, a plurality of rough rolling mills 2, a plurality of finishing rolling mills 3, a cooling zone 4, a winding device 5, and the like.
- the hot rolling line shown in FIG. 1 is a hot rolling line used when hot-rolling steel into plate-shaped steel (hot-rolled steel sheet).
- the number of rough rolling mills is 3, and the number of finish rolling mills is 7.
- a steel slab which is a hot rolling material (steel material)
- a heating furnace 1 When hot rolling steel, a steel slab, which is a hot rolling material (steel material), is heated in a heating furnace 1 until a predetermined temperature is reached. After that, it is rolled with a finishing mill 3 so as to have a predetermined thickness.
- the time until the sheet bar which is the material to be rolled bites into the finish rolling mill 3 is longer at the tail end of the sheet bar than at the front end. For this reason, even if the steel slab is heated uniformly in the heating furnace 1, the temperature at which the sheet bar is caught in the finishing mill 3, that is, the finishing mill entry side thermometer 11 (indicated by an arrow in FIG. 1). The measured temperature is generally lower at the tail end than at the front end of the seat bar.
- the front end of the sheet bar refers to the front end in the longitudinal direction (rolling direction) of the sheet bar.
- the tail end of the sheet bar refers to the rear end of the sheet bar in the longitudinal direction (rolling direction).
- the purpose is to heat the tail end side of the sheet bar before biting into the finishing mill (hereinafter also referred to as compensation heating).
- a sheet bar heater 10 is installed between the roughing mill 2 and the finishing mill 3.
- the seat bar heater 10 is used to heat and raise the temperature of the tail end of the seat bar. The rolling load is reduced so that rolling can be performed stably.
- a sizing press is installed between the heating furnace 1 and the roughing mill 2, or the width direction of the sheet bar
- an edge heater may be installed between the roughing mill 2 and the finishing mill 3.
- the sheet bar heater 10 and the edge heater are generally used for so-called difficult-to-roll materials that have a particularly large rolling load, and not only uniformly heat the sheet bar that is the material to be rolled, but also the sheet bar at a predetermined conveying position.
- a target temperature is set in advance, and compensation heating of the seat bar is performed so as to be equal to or higher than the target temperature.
- Patent Document 1 discloses a high-carbon steel hot rolling method in which a high-carbon steel sheet bar is heated by a sheet bar heater installed on the entrance side of a finishing mill and then finish-rolled by the finishing mill.
- a hot rolling method for high carbon steel characterized in that a target temperature at a predetermined conveying position of the sheet bar is determined in advance, and compensation heating of the sheet bar is performed so as to be equal to or higher than the target temperature.
- an object of the present invention is to provide a hot rolling method capable of preventing the occurrence of steel plate cracking in the cooling process after finish rolling in hot rolling of high carbon steel.
- the amount of temperature rise at the tail end of the sheet bar in advance, the presence or absence of cracks in the steel plate in the cooling zone provided on the downstream side of the finishing mill is examined, and at the tail end of the sheet bar where cracks do not occur It is effective to make the temperature rise amount the upper limit.
- the amount of temperature rise at the tail end of the sheet bar which was not cracked by the slab of the same steel type that was simultaneously hot rolled, It is also effective to do.
- a hot rolling method for high carbon steel in which a high carbon steel sheet bar is heated by a sheet bar heater installed on the entrance side of the finishing mill and then finish-rolled by the finishing mill.
- Hot-rolling method for high carbon steel in which heating is performed with a sheet bar heater so that the amount of temperature increase at the tail end of the steel sheet is equal to or less than a predetermined upper limit value; The amount is the difference between the temperature when heated by the sheet bar heater and the temperature when not heated by the sheet bar heater at the tail end of the sheet bar immediately before the finishing mill entry side.
- the present invention when hot rolling high carbon steel using a sheet bar heater, it is possible to prevent the occurrence of cracks in the steel sheet during the cooling process after finish rolling. Thereby, it is possible to stably produce a high-quality steel sheet having good quality without suppressing the heating furnace extraction temperature from being raised and causing a problem of quality problems such as occurrence of red scale.
- FIG. 1 is a schematic diagram showing a hot rolling line.
- FIG. 2 is a diagram showing the relationship between the longitudinal position of the sheet bar and the finishing mill entry side temperature when not heated by the sheet bar heater.
- FIG. 3 is a view showing the relationship between the longitudinal position of the sheet bar and the temperature at the finishing mill entry side.
- a preferred embodiment of the present invention will be described by taking as an example the case of hot rolling consisting of rough rolling and finish rolling in the hot rolling line shown in FIG.
- a high carbon steel slab obtained by continuous casting or the like is heated in a heating furnace 1 and then roughly rolled by a roughing mill 2 to obtain a high carbon steel sheet bar.
- the sheet bar obtained by the roughing mill 2 is heated (compensated heating) by the sheet bar heater 10 in order to compensate for the temperature drop on the finishing mill entry side.
- FIG. 2 is a schematic diagram of the temperature in the longitudinal direction of the sheet bar immediately before the finish rolling mill entry side (entrance side of the finish rolling mill closest to the roughing mill) when heating by the sheet bar heater 10 is not performed. Show. As described above, the tail end of the sheet bar has a lower temperature on the finishing mill entry side than the tip. It should be noted that the tail end and tip end of the sheet bar on which the temperature measurement is performed can be appropriately determined in consideration of the manufacturing conditions and the apparatus.
- the sheet bar heater 10 performs compensation heating in the longitudinal direction of the sheet bar to raise the temperature of the sheet bar.
- the amount of temperature raised by the sheet bar heater 10 is appropriately determined so that the total length of the sheet bar is within a desired temperature range so that finish rolling can be stably performed.
- the compensation heating amount at the tail end of the sheet bar becomes the maximum at the sheet bar.
- the temperature rise amount at the tail end of the seat bar which is the position where the temperature rise amount is maximum in the sheet bar, is determined in advance. Try to be below the upper limit.
- FIG. 3 as an example of the hot rolling method of the present invention, in the longitudinal direction of the seat bar, a portion from the longitudinal position Lx of the seat bar to the tail end of the seat bar is heated by the seat bar heater 10 to A schematic diagram of the temperature in the longitudinal direction of the sheet bar immediately before the finishing mill entry side (entrance side of the finishing mill closest to the roughing mill) when the tail end temperature is Ta (° C.) is shown.
- the heating amount of the seat bar by the seat bar heater 10 is set such that Lx is a position half the seat bar length so that the temperature at the tail end of the seat bar becomes Ta (° C.).
- FIG. 3 also shows a case where the sheet bar heater is not used for heating. In this case, the temperature at the tail end of the sheet bar is Tn (° C.).
- heating is performed by the seat bar heater 10 so that the temperature rise at the tail end of the seat bar is equal to or less than a predetermined upper limit value.
- the amount of temperature rise at the tail end of the seat bar is the temperature Tn (° C.) of the tail end of the seat bar when not heated by the seat bar heater 10 and is heated by the seat bar heater 10.
- Tn ° C.
- ⁇ T Ta ⁇ Tn
- the temperature Tn when not heated by the sheet bar heater 10 and the temperature Ta when heated at the tail end of the sheet bar are the temperature of the sheet bar at the exit position of the sheet bar heater 10, the size and finish of the sheet bar. It can be determined based on the distance to the rolling mill, temperature, and the like.
- Ta (° C.) is a temperature measured by the finishing mill entry side thermometer 11.
- Tn (° C.) is the temperature measured by the finishing mill entry-side thermometer 11 when the sheet bar is not heated.
- Tn (° C.) may be a value obtained by correcting the measured temperature in consideration of various operating conditions and air temperature. Further, Tn (° C.) may be obtained by calculation in consideration of manufacturing conditions and equipment.
- the amount of temperature increase at the tail end of the sheet bar: ⁇ T is variously changed in advance, and the occurrence of cracks in the steel sheet in the cooling zone 4 provided on the downstream side of the finish rolling mill is examined.
- the upper limit value of ⁇ T is determined.
- the seat bar is heated by the seat bar heater, the seat bar is heated so that the amount of temperature rise at the tail end of the seat bar is equal to or less than a predetermined upper limit value of ⁇ T.
- the amount of temperature rise at the tail end of the sheet bar that is not cracked by a slab of the same steel type that is simultaneously hot rolled can be determined as the upper limit value of ⁇ T.
- the lower limit of the temperature rise at the tail end of the seat bar can be appropriately determined in consideration of manufacturing conditions, equipment, and the like.
- the sheet bar heater 10 compensates and heats the sheet bar, raises the temperature of the tail end of the sheet bar, and suppresses breakage in the finishing mill. Moreover, the steel plate cracking in the cooling zone 4 can be suppressed.
- heating by the sheet bar heater 10 is started from the longitudinal center of the sheet bar, but the heating method of the sheet bar is not limited to such a method.
- the sheet bar may be heated over the entire length of the sheet bar so that the temperature rise at the tail end of the seat bar is less than or equal to the upper limit of ⁇ T. Only the tail end of the bar may be heated locally.
- an upper limit is set for the temperature rise amount of the seat bar. Therefore, depending on the rolling conditions and the type of the sheet bar, there may be a case where the temperature cannot be raised sufficiently to the extent that breakage in the finishing mill can be suppressed. In such a case, for example, when the upper limit value of the temperature rise of the sheet bar determined in advance is insufficient for securing the material in the longitudinal direction of the sheet bar in the finish rolling mill, The length of the slab before rolling can be shortened, the length of the sheet bar itself can be shortened, and the amount of temperature drop at the tail end of the sheet bar before finish rolling can be reduced.
- the heating method of the seat bar heater 10 various types such as induction heating and burner can be applied.
- the induction heating method is used.
- the slab heating temperature in the heating furnace is not particularly limited, and can be appropriately determined in consideration of manufacturing conditions, equipment, and the like.
- the heating furnace extraction temperature can be set to 1050 to 1150 ° C., for example.
- Table 2 shows the temperature of the steel sheet measured by the finish rolling mill thermometer 12 (indicated by an arrow in FIG. 1).
- the sheet bar was rolled into a hot-rolled steel sheet with a finish rolling mill, cooled in a cooling zone, and wound up with a winding device.
- the thickness of the finish-rolled steel sheet was 3.25 mm, the width after finish rolling was 1065 mm, and the winding temperature was 670 ° C.
- Table 2 shows the results of hot rolling.
- roller number 1 hot rolling could be performed without generating steel plate cracks in the cooling zone, and there was no occurrence of red scale, and good quality steel plates could be produced.
- rolling number 2 in which the temperature rise exceeded the range of the present invention and was too high, a steel plate crack occurred in the cooling zone.
- rolling number 3 in which the heating temperature in the heating furnace itself was increased without performing heating with the sheet bar heater, although the steel plate cracking did not occur in the cooling zone, a red scale was generated. did. The presence or absence of the occurrence of cracks in the steel plate was judged by passing through a recoil line and conducting a visual inspection.
- the upper limit value of the temperature rise at the tail end of the seat bar was set to 40 ° C.
- the upper limit of the temperature rise at the tail end of the seat bar was changed to 40 ° C. (repeated execution) and 35 ° C. Hot rolling was performed (rolling numbers 4 to 9). The results are shown in Table 3.
- the amount of temperature increase at the tail end of the seat bar was set to 40 ° C., which is the upper limit value.
- the heating position by the sheet bar heater is from the longitudinal direction 1/3 part of the sheet bar to the tail end part (rolling number 16), from the longitudinal direction 2/3 part of the sheet bar to the tail end part (rolling number 17), Hot rolling was performed under the same conditions as in Example 1 except that the heating was performed by distributing the respective slopes.
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Abstract
Description
上記シートバーの昇温量を制御するにあたり、シートバー尾端での昇温量を制御することが有効である。そして、予めシートバー尾端での昇温量を種々変更して、仕上圧延機の下流側に設けた冷却ゾーンでの鋼板割れの発生の有無を調べ、割れが発生しないシートバー尾端での昇温量を上限とすることが有効である。また、通常の操業で鋼板割れが発生した場合に、同時に熱延した同一鋼種のスラブで割れなかったもののシートバー尾端での昇温量を、シートバー尾端での昇温量の上限とすることも有効である。 Therefore, as a result of various studies to solve such a problem, when the amount of temperature rise of the sheet bar by heating with the sheet bar heater on the entrance side of the finishing mill reaches a certain temperature amount, It was found that the steel plate cracking occurred. When hot rolling is performed on high carbon steel, if an upper limit is set for the temperature rise in the sheet bar heater, it is necessary to raise the heating furnace extraction temperature without causing steel plate cracking in the cooling zone. It was found that high carbon steel can be manufactured without causing quality defects such as red scale.
In controlling the temperature rise amount of the seat bar, it is effective to control the temperature rise amount at the tail end of the sheet bar. And by changing the amount of temperature rise at the tail end of the sheet bar in advance, the presence or absence of cracks in the steel plate in the cooling zone provided on the downstream side of the finishing mill is examined, and at the tail end of the sheet bar where cracks do not occur It is effective to make the temperature rise amount the upper limit. In addition, when a steel sheet crack occurs during normal operation, the amount of temperature rise at the tail end of the sheet bar, which was not cracked by the slab of the same steel type that was simultaneously hot rolled, It is also effective to do.
[1]高炭素鋼のシートバーを、仕上圧延機の入側に設置したシートバーヒータで加熱したのち、前記仕上圧延機で仕上げ圧延する高炭素鋼の熱間圧延方法であって、シートバーの尾端での昇温量が、予め定めた上限値以下となるように、シートバーヒータでの加熱を行う高炭素鋼の熱間圧延方法;ここで、シートバーの尾端での昇温量とは、仕上圧延機入側直前のシートバーの尾端における、シートバーヒータで加熱する場合の温度と、シートバーヒータで加熱しない場合の温度の差である。 The present invention has been completed based on such findings, and the gist thereof is as follows.
[1] A hot rolling method for high carbon steel, in which a high carbon steel sheet bar is heated by a sheet bar heater installed on the entrance side of the finishing mill and then finish-rolled by the finishing mill. Hot-rolling method for high carbon steel, in which heating is performed with a sheet bar heater so that the amount of temperature increase at the tail end of the steel sheet is equal to or less than a predetermined upper limit value; The amount is the difference between the temperature when heated by the sheet bar heater and the temperature when not heated by the sheet bar heater at the tail end of the sheet bar immediately before the finishing mill entry side.
通常、Ta(℃)は仕上圧延機入側温度計11で測定した温度である。
また、通常、Tn(℃)はシートバーを加熱しなかった場合に仕上圧延機入側温度計11で測定した温度である。Tn(℃)は該測定温度に各種操業条件や気温等を考慮して補正した値としてもよい。また、Tn(℃)は製造条件や設備等を勘案して計算により求めてもよい。 The temperature Tn when not heated by the
Usually, Ta (° C.) is a temperature measured by the finishing mill
Usually, Tn (° C.) is the temperature measured by the finishing mill entry-
上述の手法の他、通常の操業で鋼板割れが発生した場合に、同時に熱延した同一鋼種のスラブで割れなかったもののシートバー尾端での昇温量をΔTの上限値と決定できる。
一方、シートバーの尾端での昇温量の下限は製造条件や装置等を勘案して適宜決定できる。 In the present invention, the amount of temperature increase at the tail end of the sheet bar: ΔT is variously changed in advance, and the occurrence of cracks in the steel sheet in the
In addition to the above-described method, when a steel plate crack occurs in a normal operation, the amount of temperature rise at the tail end of the sheet bar that is not cracked by a slab of the same steel type that is simultaneously hot rolled can be determined as the upper limit value of ΔT.
On the other hand, the lower limit of the temperature rise at the tail end of the seat bar can be appropriately determined in consideration of manufacturing conditions, equipment, and the like.
本発明において加熱炉におけるスラブ加熱温度は特に限定されず、製造条件や装置等を勘案して適宜決定できる。加熱炉抽出温度は、例えば、1050~1150℃とすることができる。 In addition, as the heating method of the
In the present invention, the slab heating temperature in the heating furnace is not particularly limited, and can be appropriately determined in consideration of manufacturing conditions, equipment, and the like. The heating furnace extraction temperature can be set to 1050 to 1150 ° C., for example.
鋼板割れの発生の有無はリコイルラインで通板して目視検査を行って判断した。鋼板幅方向のエッジ部に長さ10mm以上の割れがあった場合を鋼板割れがあると、同エッジ部に長さ10mm以上の割れがなかった場合を鋼板割れがないと判断した。実施例2以降においても同様の基準により鋼板割れの有無を判断した。 In the example of the present invention (rolling number 1), hot rolling could be performed without generating steel plate cracks in the cooling zone, and there was no occurrence of red scale, and good quality steel plates could be produced. On the other hand, in the comparative example (rolling number 2) in which the temperature rise exceeded the range of the present invention and was too high, a steel plate crack occurred in the cooling zone. Moreover, in the comparative example (rolling number 3) in which the heating temperature in the heating furnace itself was increased without performing heating with the sheet bar heater, although the steel plate cracking did not occur in the cooling zone, a red scale was generated. did.
The presence or absence of the occurrence of cracks in the steel plate was judged by passing through a recoil line and conducting a visual inspection. When there was a crack in the edge portion in the width direction of the steel plate having a length of 10 mm or more, if there was a crack in the steel plate, it was determined that there was no crack in the steel plate if there was no crack in the edge portion having a length of 10 mm or more. Also in Example 2 and later, the presence or absence of steel plate cracking was determined based on the same criteria.
2 粗圧延機
3 仕上圧延機
4 冷却ゾーン
5 巻取装置
10 シートバーヒータ
11 仕上圧延機入側温度計
12 仕上圧延機出側温度計 DESCRIPTION OF SYMBOLS 1
Claims (1)
- 高炭素鋼のシートバーを、仕上圧延機の入側に設置したシートバーヒータで加熱したのち、前記仕上圧延機で仕上げ圧延する高炭素鋼の熱間圧延方法であって、シートバーの尾端での昇温量が、予め定めた上限値以下となるように、シートバーヒータでの加熱を行う高炭素鋼の熱間圧延方法;ここで、シートバーの尾端での昇温量とは、仕上圧延機入側直前のシートバーの尾端における、シートバーヒータで加熱する場合の温度と、シートバーヒータで加熱しない場合の温度の差である。
A high carbon steel sheet bar is heated by a sheet bar heater installed on the entry side of a finishing mill and then finish-rolled by the finishing mill. Hot-rolling method for high carbon steel, in which heating with a sheet bar heater is performed so that the amount of temperature increase at or below the predetermined upper limit value; where the amount of temperature increase at the tail end of the sheet bar is The difference between the temperature when heated by the sheet bar heater and the temperature when not heated by the sheet bar heater at the tail end of the sheet bar just before entering the finishing mill.
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KR1020167028649A KR101898568B1 (en) | 2014-03-19 | 2015-02-27 | Method for hot-rolling high-carbon steel |
JP2015529744A JP5854177B1 (en) | 2014-03-19 | 2015-02-27 | Hot rolling method for high carbon steel |
CN201580014722.5A CN106102939B (en) | 2014-03-19 | 2015-02-27 | The hot-rolling method of high carbon steel |
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JP2014056082 | 2014-03-19 | ||
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KR (1) | KR101898568B1 (en) |
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Citations (4)
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JPS5530338A (en) * | 1978-08-25 | 1980-03-04 | Hitachi Ltd | Temperature control method of steel material in hot rolling mill |
JP2003275805A (en) * | 2002-03-20 | 2003-09-30 | Jfe Steel Kk | Method for hot-rolling high carbon steel |
JP2007291495A (en) * | 2006-03-28 | 2007-11-08 | Jfe Steel Kk | Hot-rolled ultrasoft high-carbon steel plate and process for production thereof |
JP2013540896A (en) * | 2010-09-16 | 2013-11-07 | ポスコ | High carbon hot-rolled steel sheet, cold-rolled steel sheet and method for producing the same |
Family Cites Families (4)
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JP2006239777A (en) * | 1997-10-07 | 2006-09-14 | Jfe Steel Kk | Method for manufacturing hot-rolled steel sheet |
JP2933923B1 (en) * | 1998-09-08 | 1999-08-16 | 川崎重工業株式会社 | Hot strip mill |
JP4165243B2 (en) * | 2003-02-05 | 2008-10-15 | 住友金属工業株式会社 | Method for controlling meandering of rolled material and method for producing hot rolled steel sheet |
CN100493750C (en) * | 2006-05-30 | 2009-06-03 | 宝山钢铁股份有限公司 | Method for ensuring the uniform temperature of the full-length of the hot fine rolling band steel |
-
2015
- 2015-02-27 CN CN201580014722.5A patent/CN106102939B/en active Active
- 2015-02-27 JP JP2015529744A patent/JP5854177B1/en active Active
- 2015-02-27 WO PCT/JP2015/001069 patent/WO2015141154A1/en active Application Filing
- 2015-02-27 KR KR1020167028649A patent/KR101898568B1/en active IP Right Grant
- 2015-03-19 TW TW104108746A patent/TWI535859B/en active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5530338A (en) * | 1978-08-25 | 1980-03-04 | Hitachi Ltd | Temperature control method of steel material in hot rolling mill |
JP2003275805A (en) * | 2002-03-20 | 2003-09-30 | Jfe Steel Kk | Method for hot-rolling high carbon steel |
JP2007291495A (en) * | 2006-03-28 | 2007-11-08 | Jfe Steel Kk | Hot-rolled ultrasoft high-carbon steel plate and process for production thereof |
JP2013540896A (en) * | 2010-09-16 | 2013-11-07 | ポスコ | High carbon hot-rolled steel sheet, cold-rolled steel sheet and method for producing the same |
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Publication number | Publication date |
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CN106102939A (en) | 2016-11-09 |
JPWO2015141154A1 (en) | 2017-04-06 |
TW201542836A (en) | 2015-11-16 |
KR101898568B1 (en) | 2018-09-13 |
CN106102939B (en) | 2018-02-13 |
KR20160133537A (en) | 2016-11-22 |
JP5854177B1 (en) | 2016-02-09 |
TWI535859B (en) | 2016-06-01 |
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