WO2020153293A1 - Steel ingot rolling method - Google Patents
Steel ingot rolling method Download PDFInfo
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- WO2020153293A1 WO2020153293A1 PCT/JP2020/001701 JP2020001701W WO2020153293A1 WO 2020153293 A1 WO2020153293 A1 WO 2020153293A1 JP 2020001701 W JP2020001701 W JP 2020001701W WO 2020153293 A1 WO2020153293 A1 WO 2020153293A1
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- 238000005096 rolling process Methods 0.000 title claims abstract description 107
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 80
- 239000010959 steel Substances 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000002093 peripheral effect Effects 0.000 claims abstract description 28
- 241000251468 Actinopterygii Species 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
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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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
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- the present invention relates to a steel ingot rolling method for rolling a steel ingot by reverse rolling with a rolling roll.
- the steel ingot formed by solidifying molten steel in a steelmaking plant with a mold has a large cross-section top end face on one side in the longitudinal direction and a small-area bottom end face on the other side in the longitudinal direction, from the top end face to the bottom end face. At least a pair of tapered outer peripheral surfaces facing each other are formed on the outer periphery in the longitudinal direction of the.
- a rolling slab is passed through the steel ingot while rolling down a pair of taper outer peripheral surfaces, and reverse rolling is performed in multiple passes to form a billet.
- Patent Document 1 performs the first first pass and the second pass in order to suppress fishtail growth, so the number of passes until the completion of rolling of the billet increases. There is a problem that the rolling time becomes long and the productivity is deteriorated. Therefore, the present invention has been made by paying attention to the unsolved problems of the above conventional examples, and an object thereof is to provide a steel ingot rolling method capable of suppressing fishtail growth and improving productivity. There is.
- a method for rolling a steel ingot according to an aspect of the present invention is a method for rolling a steel ingot by a plurality of passes of reverse rolling with a rolling roll, in which a top end face having a large cross section is formed in one of the longitudinal directions.
- the bottom end face having a small area is formed on the other side in the longitudinal direction, and in the longitudinal outer periphery between the top end face and the bottom end face, in rolling the steel ingot, at least a pair of tapered outer peripheral faces facing each other are formed,
- the first first pass of the multiple passes is performed from the top end face to the bottom end face while rolling down the pair of tapered outer peripheral surfaces of the steel ingot by the pair of rolling rolls having the roll opening H satisfying the following expression (1).
- T T is the thickness (top thickness) between the pair of tapered outer peripheral surfaces of the top end surface in the steel ingot
- T B is the thickness between the pair of tapered outer peripheral surfaces of the bottom end surface in the steel ingot.
- a is a coefficient, and is set to 0.55 ⁇ a ⁇ 0.65.
- the steel ingot rolling method of the present invention it is possible to suppress fishtail growth on the top surface and the bottom surface of the steel ingot, and to reduce the number of passes from rolling of the steel ingot to the billet for productivity. Can be improved.
- FIG. 1 is a diagram schematically showing a configuration of a steel ingot rolling method according to an embodiment of the present invention, in which a rolling roll 1 and a steel ingot which is passed through the rolling roll 1 and is subjected to reverse rolling in a plurality of passes. 2 is shown.
- the steel ingot 2 is a steel material formed by solidifying molten steel in a steelmaking plant with a mold.
- a top end surface 5 having a large cross section is formed on one side in the longitudinal direction, and a bottom end surface 6 having a small area is formed on the other side in the longitudinal direction.
- At least a pair of tapered outer peripheral surfaces 7a, 7b facing each other are formed on the outer periphery in the longitudinal direction between the top end surface 5 and the bottom end surface 6.
- the dimension between the pair of tapered outer peripheral surfaces 7a and 7b of the top end surface 5 of the steel ingot 2 is referred to as the top thickness T T
- the dimension between the pair of tapered outer peripheral surfaces 7a and 7b of the bottom end surface 6 is the bottom thickness T B.
- the rolling roll 1 is a pair of rolling rolls including an upper horizontal roll 3 and a lower horizontal roll 4.
- the roll opening H is adjusted to a predetermined value by changing the relative position of the upper horizontal roll 3 and the lower horizontal roll 4.
- the upper horizontal roll 3 and the lower horizontal roll 4 of the rolling roll 1 pass through the steel ingot 2 while rolling down the pair of tapered outer peripheral surfaces 7a and 7b to perform reverse rolling in multiple passes.
- a steel slab having a predetermined thickness is formed.
- the symbol a is a coefficient necessary for calculating the roll opening H, and is set in the range of 0.55 ⁇ a ⁇ 0.65.
- the roll opening H of the rolling roll 1 is adjusted to a value calculated by the above formula (1), and the top end surface 5 is first conveyed toward the rolling roll 1.
- the steel ingot 2 is placed on a table roller (not shown).
- the steel ingot 2 conveyed to the table roller is rolled from the top end surface 5 by the rolling roll 1 to start the first rolling of the first pass.
- the top end face 5 side of the rolling roller 1 steel ingot 2 that Tsuban to, will be rolled with the thickness T H of the roll angle H substantially the same dimensions.
- convex plastically deformed portions 8a and 8b are formed in the surface layer portion on the side of the pair of tapered outer peripheral surfaces 7a and 7b of the steel ingot 2 immediately before being rolled by the rolling roll 1.
- FIG. 4 is a continuation of the first first rolling, and when further rolling toward the bottom end face 6 side of the steel ingot 2, the convex plasticity formed immediately before being rolled by the rolling roll 1
- the deformed portions 8a and 8b plastically flow to the surface layer portion (area indicated by the broken line in FIG. 4) on the bottom end face 6 side of the pair of tapered outer peripheral surfaces 7a and 7b, and the bottom end surfaces of the pair of tapered outer peripheral surfaces 7a and 7b.
- the thickness on the 6 side increases.
- FIG. 5 shows the steel ingot 2 after the first first pass, and the convex plastically deformed portions 8a, 8b formed immediately before being rolled by the rolling roll 1 have a pair of tapered outer peripheral surfaces 7a. , 7b plastically flows to the bottom end face 6 side to increase the thickness on the bottom end face 6 side, and no fish tail is generated on the bottom end face 6.
- the coefficient a used in the calculation formula of the roll opening H of the formula (1) becomes a value below 0.55, the plasticity of the volume or more for increasing the thickness on the bottom end face 6 side to the rolling thickness T H.
- the deformed portions 8a and 8b are formed, and fish tail may occur on the bottom end surface 6.
- the coefficient a exceeds 0.65, the number of passes from rolling the steel ingot 3 to rolling a steel slab of a predetermined thickness may increase, and it is formed immediately before rolling on the rolling roll 1.
- the convex plastically deformed portions 8a and 8b do not plastically flow to the bottom end face 6 side, and a fishtail may be generated on the top end face 5 in the second pass rolling extending from the bottom end face 6 to the top end face 5. ..
- the coefficient a is set in the range of 0.55 ⁇ a ⁇ 0.65, and the rolling roll is set based on the top thickness T T and the bottom thickness T B of the steel ingot 2.
- a plurality of steel ingots 2 having a top thickness T T of 1278 mm and a bottom thickness T B of 983 mm were measured from the top end face 5 side.
- the first pass was carried out by biting into the rolling roll 1 and pressing down the pair of tapered outer peripheral surfaces 7 a and 7 b of the steel ingot 2 to pass it to the bottom end surface 6.
- rolling was performed for each steel ingot 2 with various roll openings H in which the coefficient a in the above formula (1) was changed.
- Example 1 of Patent Document 1 Japanese Patent Publication No. 56-8681
- the rolling roll 1 was bitten from the side of the top end surface 5 of the steel ingot 2 to form a recess on the top end surface 5 side of the pair of tapered outer peripheral surfaces 7a and 7b of the steel ingot 2.
- the steel ingot 2 was passed through the rolling roll 1 in the state where the reduction was released (first pass), and then rolling was performed from the bottom end face 6 side to the top end face 5 side by the same rolling roll 1 ( Second pass).
- the fish tail lengths of the top end face 5 and the bottom end face 6 were investigated for each of the present invention example, comparative example, and conventional example.
- the fish tails having a fish length equal to or shorter than that of the conventional example were evaluated as "no", and those having a fish tail length longer than the conventional example were evaluated as "existent".
- Table 1 also shows the survey results of the fish tail generation situation.
- inventive examples 1 to 3 in which the coefficient a is within the range of 0.55 ⁇ a ⁇ 0.65 are steel ingots 2 after being rolled in the second pass.
- the evaluation result of the fish tails of the top surface 5 and the bottom surface 6 of the above was “none”.
- the conventional method of forming the concave portion on the top side tapered surface in the first pass since there is no step of forming the concave portion on the one of the top side or the bottom side tapered surface, the conventional method of forming the concave portion on the top side tapered surface in the first pass. It was possible to carry out rolling to the same thickness as the conventional example (thickness after 3 passes rolling) with the number of passes (2 passes) smaller than the example by 1 pass.
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Abstract
This method is a method for rolling a steel ingot (2) by means of a plurality of passes of reverse rolling using rolling rolls (1). In the rolled ingot, a top end surface (5) having a large cross section is formed at one end in the longitudinal direction, a bottom end surface (6) having a small surface area is formed at the other end in the longitudinal direction, and a pair of tapered outer peripheral surfaces (7a), (7b) are formed on an outer periphery in the longitudinal direction, between the top end surface and the bottom end surface. In an initial first pass, rolling is performed from the top end surface to the bottom end surface by reducing the pair of tapered outer peripheral surfaces of the steel ingot using a pair of rolling rolls having a roll opening degree (H) satisfying equation (1). (1) H=TB+a ×(TT-TB) Here, reference code TT represents the thickness (top thickness) between the pair of tapered outer peripheral surfaces at the top end surface of the steel ingot, reference code TB represents the thickness (bottom thickness) between the pair of tapered outer peripheral surfaces at the bottom end surface of the steel ingot, and reference code a represents a coefficient set such that 0.55≤a≤0.65.
Description
本発明は、圧延ロールによるリバース圧延で鋼塊を圧延する鋼塊圧延方法に関する。
The present invention relates to a steel ingot rolling method for rolling a steel ingot by reverse rolling with a rolling roll.
製鋼工場において溶鋼を鋳型で固めて形成される鋼塊は、長手方向の一方に大断面のトップ端面が形成され、長手方向の他方に小面積のボトム端面が形成され、トップ端面からボトム端面までの長手方向外周に、互いに対向する少なくとも一対のテーパー外周面が形成されている。
鋼塊の圧延では、圧延ロールが一対のテーパー外周面を圧下しながら鋼塊を通板して複数パスのリバース圧延を行うことで、鋼片を形成する。 The steel ingot formed by solidifying molten steel in a steelmaking plant with a mold has a large cross-section top end face on one side in the longitudinal direction and a small-area bottom end face on the other side in the longitudinal direction, from the top end face to the bottom end face. At least a pair of tapered outer peripheral surfaces facing each other are formed on the outer periphery in the longitudinal direction of the.
In the rolling of a steel ingot, a rolling slab is passed through the steel ingot while rolling down a pair of taper outer peripheral surfaces, and reverse rolling is performed in multiple passes to form a billet.
鋼塊の圧延では、圧延ロールが一対のテーパー外周面を圧下しながら鋼塊を通板して複数パスのリバース圧延を行うことで、鋼片を形成する。 The steel ingot formed by solidifying molten steel in a steelmaking plant with a mold has a large cross-section top end face on one side in the longitudinal direction and a small-area bottom end face on the other side in the longitudinal direction, from the top end face to the bottom end face. At least a pair of tapered outer peripheral surfaces facing each other are formed on the outer periphery in the longitudinal direction of the.
In the rolling of a steel ingot, a rolling slab is passed through the steel ingot while rolling down a pair of taper outer peripheral surfaces, and reverse rolling is performed in multiple passes to form a billet.
従来の鋼塊の圧延方法では、最初の１パス目で鋼塊表面のスケールを落とすために、圧延ロールにより比較的強い圧下量で圧延を行っていた。しかし、従来の鋼塊の圧延方法は、鋼塊のトップ端面及びボトム端面にフィッシュテールが成長し、このフィッシュテールを切り捨てなければならないので、鋼塊圧延の歩留り低下を招いていた。
そこで、フィッシュテール成長を抑制する鋼塊の圧延方法として、最初の１パス目に、鋼塊のボトム端面から圧延ロールで圧延を行ってボトム端面に凹部を形成した後、鋼塊を元の位置まで戻し、２パス目で、鋼塊のトップ端面からボトム端面に形成した凹部近くまで圧延ロールで噛み戻し圧延を行う方法が知られている（例えば特許文献１）。 In the conventional method of rolling a steel ingot, in order to reduce the scale on the surface of the steel ingot in the first pass, rolling was performed by a rolling roll with a relatively strong reduction amount. However, in the conventional method of rolling a steel ingot, the fish tail grows on the top end surface and the bottom end surface of the steel ingot, and the fish tail has to be cut off, resulting in a decrease in the yield of the steel ingot rolling.
Therefore, as a rolling method of a steel ingot that suppresses fishtail growth, in the first pass, rolling is performed from the bottom end surface of the steel ingot with a rolling roll to form a recess in the bottom end surface, and then the steel ingot is moved to the original position. There is known a method of performing bite-back rolling with a rolling roll from the top end surface of the steel ingot to the vicinity of the recess formed in the bottom end surface in the second pass (for example, Patent Document 1).
そこで、フィッシュテール成長を抑制する鋼塊の圧延方法として、最初の１パス目に、鋼塊のボトム端面から圧延ロールで圧延を行ってボトム端面に凹部を形成した後、鋼塊を元の位置まで戻し、２パス目で、鋼塊のトップ端面からボトム端面に形成した凹部近くまで圧延ロールで噛み戻し圧延を行う方法が知られている（例えば特許文献１）。 In the conventional method of rolling a steel ingot, in order to reduce the scale on the surface of the steel ingot in the first pass, rolling was performed by a rolling roll with a relatively strong reduction amount. However, in the conventional method of rolling a steel ingot, the fish tail grows on the top end surface and the bottom end surface of the steel ingot, and the fish tail has to be cut off, resulting in a decrease in the yield of the steel ingot rolling.
Therefore, as a rolling method of a steel ingot that suppresses fishtail growth, in the first pass, rolling is performed from the bottom end surface of the steel ingot with a rolling roll to form a recess in the bottom end surface, and then the steel ingot is moved to the original position. There is known a method of performing bite-back rolling with a rolling roll from the top end surface of the steel ingot to the vicinity of the recess formed in the bottom end surface in the second pass (for example, Patent Document 1).
しかし、特許文献１の鋼塊の圧延方法は、フィッシュテール成長の抑制のために、最初の１パス目及び２パス目の圧延を行うので、鋼片の圧延完了までのパス数が増大して圧延時間が長くなり、生産性が悪くなるという課題があった。
そこで、本発明は、上記従来例の未解決の課題に着目してなされたものであり、フィッシュテール成長の抑制と、生産性を向上させることができる鋼塊圧延方法を提供することを目的としている。 However, the steel ingot rolling method of Patent Document 1 performs the first first pass and the second pass in order to suppress fishtail growth, so the number of passes until the completion of rolling of the billet increases. There is a problem that the rolling time becomes long and the productivity is deteriorated.
Therefore, the present invention has been made by paying attention to the unsolved problems of the above conventional examples, and an object thereof is to provide a steel ingot rolling method capable of suppressing fishtail growth and improving productivity. There is.
そこで、本発明は、上記従来例の未解決の課題に着目してなされたものであり、フィッシュテール成長の抑制と、生産性を向上させることができる鋼塊圧延方法を提供することを目的としている。 However, the steel ingot rolling method of Patent Document 1 performs the first first pass and the second pass in order to suppress fishtail growth, so the number of passes until the completion of rolling of the billet increases. There is a problem that the rolling time becomes long and the productivity is deteriorated.
Therefore, the present invention has been made by paying attention to the unsolved problems of the above conventional examples, and an object thereof is to provide a steel ingot rolling method capable of suppressing fishtail growth and improving productivity. There is.
上記目的を達成するために、本発明の一態様に係る鋼塊圧延方法は、圧延ロールによる複数パスのリバース圧延で鋼塊を圧延する方法において、長手方向の一方に大断面のトップ端面が形成され、長手方向の他方に小面積のボトム端面が形成され、トップ端面及びボトム端面の間の長手方向外周に、互いに対向する少なくとも一対のテーパー外周面が形成されている鋼塊を圧延するにあたり、複数パスのうちの最初の１パス目は、ロール開度Ｈが下記（１）式を満足する一対の圧延ロールにより、鋼塊の一対のテーパー外周面を圧下しながら、トップ端面からボトム端面まで圧延している。
Ｈ ＝ ＴＢ ＋ ａ×（ＴＴ － ＴＢ） ………（１）
ここで、符号ＴＴは、鋼塊におけるトップ端面の一対のテーパー外周面の間の厚さ（トップ厚）であり、符号ＴＢは、鋼塊におけるボトム端面の一対のテーパー外周面の間の厚さ（ボトム厚）であり、符号ａは係数であり、０．５５ ≦ ａ ≦ ０．６５に設定されている。 In order to achieve the above object, a method for rolling a steel ingot according to an aspect of the present invention is a method for rolling a steel ingot by a plurality of passes of reverse rolling with a rolling roll, in which a top end face having a large cross section is formed in one of the longitudinal directions. The bottom end face having a small area is formed on the other side in the longitudinal direction, and in the longitudinal outer periphery between the top end face and the bottom end face, in rolling the steel ingot, at least a pair of tapered outer peripheral faces facing each other are formed, The first first pass of the multiple passes is performed from the top end face to the bottom end face while rolling down the pair of tapered outer peripheral surfaces of the steel ingot by the pair of rolling rolls having the roll opening H satisfying the following expression (1). It is rolling.
H = T B + a x (T T -T B )... (1)
Here, the symbol T T is the thickness (top thickness) between the pair of tapered outer peripheral surfaces of the top end surface in the steel ingot, and the symbol T B is the thickness between the pair of tapered outer peripheral surfaces of the bottom end surface in the steel ingot. It is the thickness (bottom thickness), the symbol a is a coefficient, and is set to 0.55 ≤ a ≤ 0.65.
Ｈ ＝ ＴＢ ＋ ａ×（ＴＴ － ＴＢ） ………（１）
ここで、符号ＴＴは、鋼塊におけるトップ端面の一対のテーパー外周面の間の厚さ（トップ厚）であり、符号ＴＢは、鋼塊におけるボトム端面の一対のテーパー外周面の間の厚さ（ボトム厚）であり、符号ａは係数であり、０．５５ ≦ ａ ≦ ０．６５に設定されている。 In order to achieve the above object, a method for rolling a steel ingot according to an aspect of the present invention is a method for rolling a steel ingot by a plurality of passes of reverse rolling with a rolling roll, in which a top end face having a large cross section is formed in one of the longitudinal directions. The bottom end face having a small area is formed on the other side in the longitudinal direction, and in the longitudinal outer periphery between the top end face and the bottom end face, in rolling the steel ingot, at least a pair of tapered outer peripheral faces facing each other are formed, The first first pass of the multiple passes is performed from the top end face to the bottom end face while rolling down the pair of tapered outer peripheral surfaces of the steel ingot by the pair of rolling rolls having the roll opening H satisfying the following expression (1). It is rolling.
H = T B + a x (T T -T B )... (1)
Here, the symbol T T is the thickness (top thickness) between the pair of tapered outer peripheral surfaces of the top end surface in the steel ingot, and the symbol T B is the thickness between the pair of tapered outer peripheral surfaces of the bottom end surface in the steel ingot. It is the thickness (bottom thickness), the symbol a is a coefficient, and is set to 0.55 ≤ a ≤ 0.65.
本発明に係る鋼塊圧延方法によれば、鋼塊のトップ面及びボトム面のフィッシュテール成長を抑制することができるとともに、鋼塊から鋼片に圧延するまでのパス数を減少させて生産性を向上させることができる。
According to the steel ingot rolling method of the present invention, it is possible to suppress fishtail growth on the top surface and the bottom surface of the steel ingot, and to reduce the number of passes from rolling of the steel ingot to the billet for productivity. Can be improved.
次に、図面を参照して、本発明に係る一実施形態を説明する。以下の図面の記載において、同一又は類似の部分には同一又は類似の符号を付している。ただし、図面は模式的なものであり、厚みと平面寸法との関係、各層の厚みの比率、圧延機のスタンド数等は現実のものとは異なることに留意すべきである。したがって、具体的な厚みや寸法は以下の説明を参酌して判断すべきものである。また、図面相互間においても互いの寸法の関係や比率が異なる部分が含まれていることはもちろんである。
以下に示す一実施形態は、本発明の技術的思想を具体化するための装置や方法を例示するものであって、本発明の技術的思想は、構成部品の材質、形状、構造、配置等を下記のものに特定するものでない。本発明の技術的思想は、特許請求の範囲に記載された請求項が規定する技術的範囲内において、種々の変更を加えることができる。 Next, an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar reference numerals are given to the same or similar parts. However, it should be noted that the drawings are schematic and the relationship between the thickness and the plane dimension, the ratio of the thickness of each layer, the number of stands of the rolling mill, and the like are different from the actual ones. Therefore, the specific thickness and dimensions should be determined in consideration of the following description. Further, it is needless to say that the drawings include portions in which dimensional relationships and ratios are different from each other.
The following one embodiment exemplifies an apparatus and a method for embodying the technical idea of the present invention, and the technical idea of the present invention is the material, shape, structure, arrangement, etc. of components. Is not specified below. Various changes can be added to the technical idea of the present invention within the technical scope defined by the claims described in the claims.
以下に示す一実施形態は、本発明の技術的思想を具体化するための装置や方法を例示するものであって、本発明の技術的思想は、構成部品の材質、形状、構造、配置等を下記のものに特定するものでない。本発明の技術的思想は、特許請求の範囲に記載された請求項が規定する技術的範囲内において、種々の変更を加えることができる。 Next, an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar reference numerals are given to the same or similar parts. However, it should be noted that the drawings are schematic and the relationship between the thickness and the plane dimension, the ratio of the thickness of each layer, the number of stands of the rolling mill, and the like are different from the actual ones. Therefore, the specific thickness and dimensions should be determined in consideration of the following description. Further, it is needless to say that the drawings include portions in which dimensional relationships and ratios are different from each other.
The following one embodiment exemplifies an apparatus and a method for embodying the technical idea of the present invention, and the technical idea of the present invention is the material, shape, structure, arrangement, etc. of components. Is not specified below. Various changes can be added to the technical idea of the present invention within the technical scope defined by the claims described in the claims.
図１は、本発明に係る一実施形態の鋼塊圧延方法の構成を概略的に示す図であり、圧延ロール１と、圧延ロール１に通板して複数パスのリバース圧延が行われる鋼塊２と、を示している。
鋼塊２は、製鋼工場において溶鋼を鋳型で固めて形成された鋼材であり、長手方向の一方に大断面のトップ端面５が形成され、長手方向の他方に小面積のボトム端面６が形成され、トップ端面５及びボトム端面６の間の長手方向外周に、互いに対向する少なくとも一対のテーパー外周面７ａ，７ｂが形成されている。 FIG. 1 is a diagram schematically showing a configuration of a steel ingot rolling method according to an embodiment of the present invention, in which a rolling roll 1 and a steel ingot which is passed through the rolling roll 1 and is subjected to reverse rolling in a plurality of passes. 2 is shown.
Thesteel ingot 2 is a steel material formed by solidifying molten steel in a steelmaking plant with a mold. A top end surface 5 having a large cross section is formed on one side in the longitudinal direction, and a bottom end surface 6 having a small area is formed on the other side in the longitudinal direction. At least a pair of tapered outer peripheral surfaces 7a, 7b facing each other are formed on the outer periphery in the longitudinal direction between the top end surface 5 and the bottom end surface 6.
鋼塊２は、製鋼工場において溶鋼を鋳型で固めて形成された鋼材であり、長手方向の一方に大断面のトップ端面５が形成され、長手方向の他方に小面積のボトム端面６が形成され、トップ端面５及びボトム端面６の間の長手方向外周に、互いに対向する少なくとも一対のテーパー外周面７ａ，７ｂが形成されている。 FIG. 1 is a diagram schematically showing a configuration of a steel ingot rolling method according to an embodiment of the present invention, in which a rolling roll 1 and a steel ingot which is passed through the rolling roll 1 and is subjected to reverse rolling in a plurality of passes. 2 is shown.
The
この鋼塊２のトップ端面５の一対のテーパー外周面７ａ，７ｂの間の寸法をトップ厚ＴＴと称し、ボトム端面６の一対のテーパー外周面７ａ，７ｂの間の寸法をボトム厚ＴＢと称している。
圧延ロール１は、上部水平ロール３と、下部水平ロール４とを備えている一対の圧延ロールである。圧延ロール１は、上部水平ロール３及び下部水平ロール４の相対位置を変化させることで、ロール開度Ｈが所定値に調整される。そして、圧延ロール１の上部水平ロール３及び下部水平ロール４が一対のテーパー外周面７ａ，７ｂを圧下しながら鋼塊２を通板して複数パスのリバース圧延を行う。そして、複数パスの初期パスから後半パスにかけて、圧延ロール１のロール開度Ｈを徐々に小さくしていくことで、所定厚さの鋼片が形成される。 The dimension between the pair of tapered outer peripheral surfaces 7a and 7b of the top end surface 5 of the steel ingot 2 is referred to as the top thickness T T, and the dimension between the pair of tapered outer peripheral surfaces 7a and 7b of the bottom end surface 6 is the bottom thickness T B. Is called.
The rolling roll 1 is a pair of rolling rolls including an upperhorizontal roll 3 and a lower horizontal roll 4. In the rolling roll 1, the roll opening H is adjusted to a predetermined value by changing the relative position of the upper horizontal roll 3 and the lower horizontal roll 4. Then, the upper horizontal roll 3 and the lower horizontal roll 4 of the rolling roll 1 pass through the steel ingot 2 while rolling down the pair of tapered outer peripheral surfaces 7a and 7b to perform reverse rolling in multiple passes. Then, by gradually reducing the roll opening H of the rolling roll 1 from the initial pass of the plurality of passes to the latter half pass, a steel slab having a predetermined thickness is formed.
圧延ロール１は、上部水平ロール３と、下部水平ロール４とを備えている一対の圧延ロールである。圧延ロール１は、上部水平ロール３及び下部水平ロール４の相対位置を変化させることで、ロール開度Ｈが所定値に調整される。そして、圧延ロール１の上部水平ロール３及び下部水平ロール４が一対のテーパー外周面７ａ，７ｂを圧下しながら鋼塊２を通板して複数パスのリバース圧延を行う。そして、複数パスの初期パスから後半パスにかけて、圧延ロール１のロール開度Ｈを徐々に小さくしていくことで、所定厚さの鋼片が形成される。 The dimension between the pair of tapered outer
The rolling roll 1 is a pair of rolling rolls including an upper
次に、本実施形態の鋼塊２の圧延における最初の１パス目の圧延手順について、図２から図５を参照して説明する。
最初の１パス目を行う前に、圧延ロール１のロール開度Ｈを、鋼塊２の形状（トップ厚ＴＴ、ボトム厚ＴＢ）に基づいて下記の（１）式で演算する。
Ｈ ＝ ＴＢ ＋ ａ×（ＴＴ － ＴＢ） ………（１）
ここで、符号ａは、ロール開度Ｈの演算に必要な係数であり、０．５５ ≦ ａ ≦ ０．６５の範囲に設定されている。 Next, the rolling procedure of the first first pass in rolling thesteel ingot 2 of the present embodiment will be described with reference to FIGS. 2 to 5.
Before performing the first first pass, the roll opening H of the rolling roll 1 is calculated by the following formula (1) based on the shape of the steel ingot 2 (top thickness T T , bottom thickness T B ).
H = T B + a x (T T -T B )... (1)
Here, the symbol a is a coefficient necessary for calculating the roll opening H, and is set in the range of 0.55 ≤ a ≤ 0.65.
最初の１パス目を行う前に、圧延ロール１のロール開度Ｈを、鋼塊２の形状（トップ厚ＴＴ、ボトム厚ＴＢ）に基づいて下記の（１）式で演算する。
Ｈ ＝ ＴＢ ＋ ａ×（ＴＴ － ＴＢ） ………（１）
ここで、符号ａは、ロール開度Ｈの演算に必要な係数であり、０．５５ ≦ ａ ≦ ０．６５の範囲に設定されている。 Next, the rolling procedure of the first first pass in rolling the
Before performing the first first pass, the roll opening H of the rolling roll 1 is calculated by the following formula (1) based on the shape of the steel ingot 2 (top thickness T T , bottom thickness T B ).
H = T B + a x (T T -T B )... (1)
Here, the symbol a is a coefficient necessary for calculating the roll opening H, and is set in the range of 0.55 ≤ a ≤ 0.65.
次いで、図２に示すように、圧延ロール１のロール開度Ｈを、上記（１）式で演算した値に調整するとともに、トップ端面５が最初に圧延ロール１に向って搬送されるように、鋼塊２をテーブルローラ（不図示）に配置する。
次いで、図３に示すように、テーブルローラに搬送された鋼塊２をトップ端面５から圧延ロール１で圧延していくことで、最初の１パス目の圧延を開始する。この際、圧延ロール１に通板した鋼塊２のトップ端面５側は、ロール開度Ｈと略同一寸法の圧延厚さＴＨで圧延されていく。ここで、圧延ロール１に圧延される直前の鋼塊２の一対のテーパー外周面７ａ，７ｂ側の表層部には、凸状の塑性変形部８ａ，８ｂが形成されていく。 Next, as shown in FIG. 2, the roll opening H of the rolling roll 1 is adjusted to a value calculated by the above formula (1), and thetop end surface 5 is first conveyed toward the rolling roll 1. , The steel ingot 2 is placed on a table roller (not shown).
Next, as shown in FIG. 3, thesteel ingot 2 conveyed to the table roller is rolled from the top end surface 5 by the rolling roll 1 to start the first rolling of the first pass. At this time, the top end face 5 side of the rolling roller 1 steel ingot 2 that Tsuban to, will be rolled with the thickness T H of the roll angle H substantially the same dimensions. Here, convex plastically deformed portions 8a and 8b are formed in the surface layer portion on the side of the pair of tapered outer peripheral surfaces 7a and 7b of the steel ingot 2 immediately before being rolled by the rolling roll 1.
次いで、図３に示すように、テーブルローラに搬送された鋼塊２をトップ端面５から圧延ロール１で圧延していくことで、最初の１パス目の圧延を開始する。この際、圧延ロール１に通板した鋼塊２のトップ端面５側は、ロール開度Ｈと略同一寸法の圧延厚さＴＨで圧延されていく。ここで、圧延ロール１に圧延される直前の鋼塊２の一対のテーパー外周面７ａ，７ｂ側の表層部には、凸状の塑性変形部８ａ，８ｂが形成されていく。 Next, as shown in FIG. 2, the roll opening H of the rolling roll 1 is adjusted to a value calculated by the above formula (1), and the
Next, as shown in FIG. 3, the
図４は、最初の１パス目の圧延の続きであり、さらに鋼塊２のボトム端面６側に向かって圧延していくと、圧延ロール１に圧延される直前に形成された凸状の塑性変形部８ａ，８ｂが、一対のテーパー外周面７ａ，７ｂのボトム端面６側の表層部（図４の破線で示す領域）に塑性流動していき、一対のテーパー外周面７ａ，７ｂのボトム端面６側の厚さが増大していく。
図５は、最初の１パス目が終了した鋼塊２を示すものであり、圧延ロール１に圧延される直前に形成された凸状の塑性変形部８ａ，８ｂは、一対のテーパー外周面７ａ，７ｂのボトム端面６側に塑性流動してボトム端面６側の厚さを増大させ、ボトム端面６にはフィッシュテールが発生しない。 FIG. 4 is a continuation of the first first rolling, and when further rolling toward thebottom end face 6 side of the steel ingot 2, the convex plasticity formed immediately before being rolled by the rolling roll 1 The deformed portions 8a and 8b plastically flow to the surface layer portion (area indicated by the broken line in FIG. 4) on the bottom end face 6 side of the pair of tapered outer peripheral surfaces 7a and 7b, and the bottom end surfaces of the pair of tapered outer peripheral surfaces 7a and 7b. The thickness on the 6 side increases.
FIG. 5 shows thesteel ingot 2 after the first first pass, and the convex plastically deformed portions 8a, 8b formed immediately before being rolled by the rolling roll 1 have a pair of tapered outer peripheral surfaces 7a. , 7b plastically flows to the bottom end face 6 side to increase the thickness on the bottom end face 6 side, and no fish tail is generated on the bottom end face 6.
図５は、最初の１パス目が終了した鋼塊２を示すものであり、圧延ロール１に圧延される直前に形成された凸状の塑性変形部８ａ，８ｂは、一対のテーパー外周面７ａ，７ｂのボトム端面６側に塑性流動してボトム端面６側の厚さを増大させ、ボトム端面６にはフィッシュテールが発生しない。 FIG. 4 is a continuation of the first first rolling, and when further rolling toward the
FIG. 5 shows the
ここで、（１）式のロール開度Ｈの演算式で使用する係数ａが０．５５を下回る値になると、ボトム端面６側の厚さを圧延厚さＴＨまで増大させる体積以上の塑性変形部８ａ，８ｂが形成されてしまい、ボトム端面６にフィッシュテールが発生するおそれがある。
また、係数ａが０．６５を上回る値になると、鋼塊３から所定厚さの鋼片を圧延するまでのパス数が増大するおそれがあるともに、圧延ロール１に圧延される直前に形成された凸状の塑性変形部８ａ，８ｂがボトム端面６側に塑性流動せず、ボトム端面６からトップ端面５まで延在する２パス目の圧延でトップ端面５にフィッシュテールが発生するおそれがある。 Here, when the coefficient a used in the calculation formula of the roll opening H of the formula (1) becomes a value below 0.55, the plasticity of the volume or more for increasing the thickness on thebottom end face 6 side to the rolling thickness T H. The deformed portions 8a and 8b are formed, and fish tail may occur on the bottom end surface 6.
Further, if the coefficient a exceeds 0.65, the number of passes from rolling thesteel ingot 3 to rolling a steel slab of a predetermined thickness may increase, and it is formed immediately before rolling on the rolling roll 1. The convex plastically deformed portions 8a and 8b do not plastically flow to the bottom end face 6 side, and a fishtail may be generated on the top end face 5 in the second pass rolling extending from the bottom end face 6 to the top end face 5. ..
また、係数ａが０．６５を上回る値になると、鋼塊３から所定厚さの鋼片を圧延するまでのパス数が増大するおそれがあるともに、圧延ロール１に圧延される直前に形成された凸状の塑性変形部８ａ，８ｂがボトム端面６側に塑性流動せず、ボトム端面６からトップ端面５まで延在する２パス目の圧延でトップ端面５にフィッシュテールが発生するおそれがある。 Here, when the coefficient a used in the calculation formula of the roll opening H of the formula (1) becomes a value below 0.55, the plasticity of the volume or more for increasing the thickness on the
Further, if the coefficient a exceeds 0.65, the number of passes from rolling the
したがって、本実施形態の鋼塊圧延方法によると、係数ａを、０．５５ ≦ ａ ≦ ０．６５の範囲に設定し、鋼塊２のトップ厚ＴＴ、ボトム厚ＴＢに基づいて圧延ロール１のロール開度Ｈを演算し（ Ｈ ＝ ＴＢ ＋ ａ×（ＴＴ － ＴＢ） ）、このロール開度Ｈに設定した圧延ロール１で、最初の１パス目で鋼塊２をトップ端面５からボトム端面６まで圧延していくと、一対のテーパー外周面７ａ，７ｂ側の表層部に形成された塑性変形部８ａ，８ｂが、ボトム端面６側の表層部に塑性流動して一対のテーパー外周面７ａ，７ｂのボトム端面６側の厚さを増大させていき、トップ端面５及びボトム端面６にフィッシュテールを発生させずに、圧延厚さＴＨで鋼塊２を圧延することができる。
また、最初の１パス目で鋼塊２のフッシュテール成長を抑制することができるので、鋼片の圧延完了までのパス数が減少して圧延時間が短くなり、鋼片の生産性を向上させることができる。 Therefore, according to the steel ingot rolling method of the present embodiment, the coefficient a is set in the range of 0.55 ≤ a ≤ 0.65, and the rolling roll is set based on the top thickness T T and the bottom thickness T B of thesteel ingot 2. The roll opening H of No. 1 is calculated (H=T B +a×(T T −T B )), and the rolling roll 1 set to this roll opening H is used to top the steel ingot 2 in the first pass. When rolling from the end surface 5 to the bottom end surface 6, the plastically deformed portions 8a and 8b formed in the surface layer portion on the side of the pair of tapered outer peripheral surfaces 7a and 7b plastically flow to the surface layer portion on the side of the bottom end surface 6 to form a pair. tapered outer peripheral surface 7a of gradually increasing the bottom end face 6 side thickness of 7b, without generating fishtail in the top end face 5 and a bottom end face 6, to roll the steel ingot 2 rolled thickness T H You can
Further, since the fishtail growth of thesteel ingot 2 can be suppressed in the first first pass, the number of passes until the rolling of the billet is completed is reduced and the rolling time is shortened, thereby improving the productivity of the billet. be able to.
また、最初の１パス目で鋼塊２のフッシュテール成長を抑制することができるので、鋼片の圧延完了までのパス数が減少して圧延時間が短くなり、鋼片の生産性を向上させることができる。 Therefore, according to the steel ingot rolling method of the present embodiment, the coefficient a is set in the range of 0.55 ≤ a ≤ 0.65, and the rolling roll is set based on the top thickness T T and the bottom thickness T B of the
Further, since the fishtail growth of the
本発明例および比較例として、トップ厚ＴＴが1278mm、ボトム厚ＴＢが983mmの複数本の鋼塊２（本発明例１～３、比較例１～４）について、トップ端面５の側から圧延ロール１に噛み込ませ、鋼塊２の一対のテーパー外周面７ａ，７ｂを圧下してボトム端面６まで通材する１パス目の圧延を行った。１パス目の圧延の際には、鋼塊２毎に、上記の（１）式における係数ａを変化させた種々のロール開度Ｈによる圧延を実施した。１パス目の圧延終了後、鋼塊２のボトム端面６の側から圧延ロール１に噛み込ませトップ端面５まで通材する２パス目の圧延を行った。１パス目のロール開度Ｈおよび係数ａ、２パス目のロール開度Ｈを表１に示す。
As examples of the present invention and comparative examples, a plurality of steel ingots 2 having a top thickness T T of 1278 mm and a bottom thickness T B of 983 mm (Invention Examples 1 to 3 and Comparative Examples 1 to 4) were measured from the top end face 5 side. The first pass was carried out by biting into the rolling roll 1 and pressing down the pair of tapered outer peripheral surfaces 7 a and 7 b of the steel ingot 2 to pass it to the bottom end surface 6. At the time of rolling in the first pass, rolling was performed for each steel ingot 2 with various roll openings H in which the coefficient a in the above formula (1) was changed. After the completion of the first pass rolling, a second pass rolling was performed in which the bottom end face 6 side of the steel ingot 2 was caught in the rolling roll 1 and passed through to the top end face 5. Table 1 shows the roll opening H of the first pass, the coefficient a, and the roll opening H of the second pass.
また、従来例として、特許文献１（特公昭56-8681号公報）の実施例１と類似する方法によっても行った。すなわち、従来法では、鋼塊２のトップ端面５の側から圧延ロール１に噛み込ませ、鋼塊２の一対のテーパー外周面７ａ，７ｂのトップ端面５側に凹部を形成した。その後、圧下を解放した状態で鋼塊２を圧延ロール１に通材し（１パス目）、次いで、同じ圧延ロール１にてボトム端面６側からトップ端面５側へ向けて圧延を行った（２パス目）。２パス目のボトム端面６側からトップ端面５側への圧延では、トップ端面５側に凹部を形成した面と同じテーパー外周面を圧下した。さらに、３パス目の圧延で上記の本発明例および比較例の２パス目と同じロール開度として、トップ端面５側からボトム端面６側へ向けて圧延を行った。表１に、各パスのロール開度を示す。
Also, as a conventional example, a method similar to Example 1 of Patent Document 1 (Japanese Patent Publication No. 56-8681) was used. That is, in the conventional method, the rolling roll 1 was bitten from the side of the top end surface 5 of the steel ingot 2 to form a recess on the top end surface 5 side of the pair of tapered outer peripheral surfaces 7a and 7b of the steel ingot 2. After that, the steel ingot 2 was passed through the rolling roll 1 in the state where the reduction was released (first pass), and then rolling was performed from the bottom end face 6 side to the top end face 5 side by the same rolling roll 1 ( Second pass). In the rolling from the bottom end surface 6 side to the top end surface 5 side in the second pass, the same tapered outer peripheral surface as the surface having the concave portion formed on the top end surface 5 side was rolled down. Further, rolling was performed from the top end face 5 side to the bottom end face 6 side in the third pass with the same roll opening as in the second pass of the present invention example and the comparative example. Table 1 shows the roll opening of each pass.
圧延後に、本発明例、比較例、および従来例それぞれについてトップ端面５およびボトム端面６のフィッシュテール長さを調査した。フィッシュテール長さが従来例と同等以下であるものをフィッシュテールの発生「無」、従来例よりフィッシュテール長さが長いものをフィッシュテールの発生「有」として評価した。表１には、フィッシュテール発生状況の調査結果を合わせて示す。
After rolling, the fish tail lengths of the top end face 5 and the bottom end face 6 were investigated for each of the present invention example, comparative example, and conventional example. The fish tails having a fish length equal to or shorter than that of the conventional example were evaluated as "no", and those having a fish tail length longer than the conventional example were evaluated as "existent". Table 1 also shows the survey results of the fish tail generation situation.
表１から明らかなように、係数ａが０．５５ ≦ ａ ≦ ０．６５の範囲内となっている本発明例１～本発明例３は、２パス目で圧延された後の鋼塊２のトップ面５及びボトム面６のフィッシュテールの評価結果が「無」であった。しかも、本発明例１～本発明例３は、トップ側あるいはボトム側の一方のテーパー面に凹部を形成する工程がないため、１パス目でトップ側のテーパー面に凹部を形成している従来例よりも１パス分だけ少ないパス数（２パス）で、従来例と同じ厚み（３パス圧延後の厚さ）までの圧延を実施できた。
As is clear from Table 1, inventive examples 1 to 3 in which the coefficient a is within the range of 0.55≦a≦0.65 are steel ingots 2 after being rolled in the second pass. The evaluation result of the fish tails of the top surface 5 and the bottom surface 6 of the above was “none”. Moreover, in the present invention example 1 to the present invention example 3, since there is no step of forming the concave portion on the one of the top side or the bottom side tapered surface, the conventional method of forming the concave portion on the top side tapered surface in the first pass. It was possible to carry out rolling to the same thickness as the conventional example (thickness after 3 passes rolling) with the number of passes (2 passes) smaller than the example by 1 pass.
一方、比較例１，２は、係数ａが０．６５を上回っているので、２パス目圧延後の鋼塊２のトップ面５にフィッシュテールが発生した。
さらに、比較例３，４は、係数ａが０．５５を下回っているので、１パス目で圧延された鋼塊２のボトム端面６にフィッシュテールが発生し、こが２パス目圧延後にも残っていた。 On the other hand, in Comparative Examples 1 and 2, the coefficient a exceeds 0.65, and thus fish tails were generated on thetop surface 5 of the steel ingot 2 after the second pass rolling.
Further, in Comparative Examples 3 and 4, since the coefficient a is less than 0.55, a fish tail is generated on thebottom end face 6 of the steel ingot 2 rolled in the first pass, and even after the second pass rolling. It was left.
さらに、比較例３，４は、係数ａが０．５５を下回っているので、１パス目で圧延された鋼塊２のボトム端面６にフィッシュテールが発生し、こが２パス目圧延後にも残っていた。 On the other hand, in Comparative Examples 1 and 2, the coefficient a exceeds 0.65, and thus fish tails were generated on the
Further, in Comparative Examples 3 and 4, since the coefficient a is less than 0.55, a fish tail is generated on the
１ 圧延ロール
２ 鋼塊
３ 上部水平ロール
４ 下部水平ロール
５ トップ端面
６ ボトム端面
７ａ，７ｂ テーパー外周面
８ａ，８ｂ 塑性変形部
ＴＴ トップ厚
ＴＢ ボトム厚
Ｈ ロール開度
ａ 係数 1 rollingroll 2 steel ingot 3 upper horizontal roll 4 lower horizontal roll 5 top end face 6 bottom end face 7a, 7b taper outer peripheral faces 8a, 8b plastically deformed portion T T top thickness T B bottom thickness H roll opening a coefficient
２ 鋼塊
３ 上部水平ロール
４ 下部水平ロール
５ トップ端面
６ ボトム端面
７ａ，７ｂ テーパー外周面
８ａ，８ｂ 塑性変形部
ＴＴ トップ厚
ＴＢ ボトム厚
Ｈ ロール開度
ａ 係数 1 rolling
Claims (1)
- 圧延ロールによる複数パスのリバース圧延で鋼塊を圧延する方法において、
長手方向の一方に大断面のトップ端面が形成され、長手方向の他方に小面積のボトム端面が形成され、前記トップ端面及び前記ボトム端面の間の長手方向外周に、互いに対向する少なくとも一対のテーパー外周面が形成されている鋼塊を圧延するにあたり、
前記複数パスのうちの最初の１パス目は、ロール開度Ｈが下記（１）式を満足する一対の圧延ロールにより、前記鋼塊の前記一対のテーパー外周面を圧下しながら、前記トップ端面から前記ボトム端面まで圧延することを特徴とする鋼塊圧延方法。
Ｈ ＝ ＴＢ ＋ ａ×（ＴＴ － ＴＢ） ………（１）
ここで、符号ＴＴは、鋼塊におけるトップ端面の一対のテーパー外周面の間の厚さ（トップ厚）であり、符号ＴＢは、鋼塊におけるボトム端面の一対のテーパー外周面の間の厚さ（ボトム厚）であり、符号ａは係数であり、０．５５ ≦ ａ ≦ ０．６５に設定されている。 In the method of rolling the steel ingot by the multi-pass reverse rolling with the rolling rolls,
A top end face having a large cross section is formed on one side in the longitudinal direction, and a bottom end face having a small area is formed on the other side in the longitudinal direction, and at least a pair of tapers facing each other are provided on the outer circumference in the longitudinal direction between the top end face and the bottom end face. When rolling the steel ingot with the outer peripheral surface formed,
The first first pass of the plurality of passes is performed by pressing down the pair of tapered outer peripheral surfaces of the steel ingot by a pair of rolling rolls having a roll opening H satisfying the following expression (1), To a bottom end surface of the steel ingot.
H = T B + a x (T T -T B )... (1)
Here, the symbol T T is the thickness (top thickness) between the pair of tapered outer peripheral surfaces of the top end face in the steel ingot, and the symbol T B is the thickness between the pair of tapered outer peripheral surfaces of the bottom end face in the steel ingot. It is the thickness (bottom thickness), the symbol a is a coefficient, and is set to 0.55 ≤ a ≤ 0.65.
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| CN202080010220.6A CN113396021B (en) | 2019-01-21 | 2020-01-20 | Steel ingot rolling method |
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| JPS5393158A (en) * | 1977-01-27 | 1978-08-15 | Kawasaki Steel Co | Fish tail growth preventive at blooming |
| JPS5497559A (en) * | 1978-01-18 | 1979-08-01 | Kawasaki Steel Co | Decreasing of fishtail in rolling |
| JPS54123553A (en) * | 1978-03-20 | 1979-09-25 | Sumitomo Metal Ind Ltd | Rolling method for steel ingot |
| JPH07314001A (en) * | 1994-05-31 | 1995-12-05 | Kawasaki Steel Corp | Blooming method |
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| JPS53123358A (en) * | 1977-04-04 | 1978-10-27 | Kawasaki Steel Co | Steel plate rolling method |
| JPH0679721B2 (en) * | 1986-12-01 | 1994-10-12 | 川崎製鉄株式会社 | Slab width reduction method |
| JP2003088902A (en) * | 2001-09-18 | 2003-03-25 | Nippon Steel Corp | Rolling method at great draft |
| EP2500113A1 (en) * | 2011-03-14 | 2012-09-19 | Siemens Aktiengesellschaft | Method and mill train for milling a milled product produced using a block casting method, control and/or regulating device for a mill train, machine readable program code for a control and/or regulating device and storage medium |
| CN102688895B (en) * | 2011-03-23 | 2014-12-03 | 宝山钢铁股份有限公司 | Steel ingot cone elimination rolling control method for heavy plate mill |
| GB2518444A (en) * | 2013-09-24 | 2015-03-25 | Siemens Ag | Rolling Method |
| DE102015202642A1 (en) * | 2015-02-13 | 2016-08-18 | Muhr Und Bender Kg | A method of making a product of rolled strip material |
| CN105013816A (en) * | 2015-07-26 | 2015-11-04 | 重庆万斯金属特种成形有限公司 | Blooming mill for steel billets |
| CN108393351A (en) * | 2017-02-08 | 2018-08-14 | 鞍钢股份有限公司 | A kind of compound LP steel plates and its production method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5393158A (en) * | 1977-01-27 | 1978-08-15 | Kawasaki Steel Co | Fish tail growth preventive at blooming |
| JPS5497559A (en) * | 1978-01-18 | 1979-08-01 | Kawasaki Steel Co | Decreasing of fishtail in rolling |
| JPS54123553A (en) * | 1978-03-20 | 1979-09-25 | Sumitomo Metal Ind Ltd | Rolling method for steel ingot |
| JPH07314001A (en) * | 1994-05-31 | 1995-12-05 | Kawasaki Steel Corp | Blooming method |
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| JP2020116592A (en) | 2020-08-06 |
| CN113396021A (en) | 2021-09-14 |
| JP6798567B2 (en) | 2020-12-09 |
| CN113396021B (en) | 2023-03-28 |
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