JP2012024805A - Method for manufacturing bar steel - Google Patents

Method for manufacturing bar steel Download PDF

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JP2012024805A
JP2012024805A JP2010165667A JP2010165667A JP2012024805A JP 2012024805 A JP2012024805 A JP 2012024805A JP 2010165667 A JP2010165667 A JP 2010165667A JP 2010165667 A JP2010165667 A JP 2010165667A JP 2012024805 A JP2012024805 A JP 2012024805A
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water
cooling
cooling water
steel
steel slab
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JP5556472B2 (en
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Yoshimichi Hino
善道 日野
Kazukuni Hase
和邦 長谷
Hideto Kimura
秀途 木村
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JFE Steel Corp
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JFE Steel Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a bar steel capable of manufacturing the bar steel with uniform material quality by suppressing excessive cooling of a corner of a billet by cooling water when cooling the billet rolled into a square cross sectional shape through a rough rolling mill to a predetermined temperature by a water cooling device.SOLUTION: When cooling the billet (intermediate rolled stock 4) rolled into the square cross sectional shape through the rough rolling mill to the predetermined temperature by the water cooling device 5, cooling water 8A is blown to the entire upper and lower surfaces of the intermediate rolled stock 4 from a cooling water injection nozzle 9A and cooling water 8B with pressure rebounded at the surface of the intermediate rolled stock 4 is blown to the center parts of the left and right side surfaces of the intermediate rolled stock 4 from a cooling water injection nozzle 9B so that the intermediate rolled stock 4 is cooled to the predetermined temperature.

Description

本発明は、例えば自動車や建設機械の部品素材として用いられる棒鋼の製造方法に関する。   The present invention relates to a method of manufacturing a steel bar used as a part material of, for example, an automobile or a construction machine.

自動車や建設機械の部品素材として用いられる棒鋼は、通常、連続鋳造機等で断面矩形状に鋳造された鋼片（ブルーム）を加熱炉で所定温度に加熱した後、粗圧延機により断面方形状に圧延し、さらに仕上圧延機で断面円形状に圧延して製造される。
この場合、靭性などの機械的特性を改善するために、粗圧延機で断面方形状に圧延された鋼片を所定温度に冷えるまで放置することで仕上圧延温度を低温化することが行われている。そこで、水冷装置により所定温度に冷却すれば、冷却の高能率化ができると期待される。しかし、粗圧延機で断面方形状に圧延された鋼片を冷却する水冷装置として、鋼片の表面全体に冷却水を吹き付けて鋼片を冷却する方式のものを用いると、鋼片の角部が冷却水によって過冷却され、材質の均一な棒鋼を製造することが難しくなるという問題が生じる。
このような問題は熱延鋼板を熱間圧延工程で水冷する場合にも発生し、特許文献１には、スプレイヘッダーからの冷却水が熱延鋼板の上面中央部のみに散水されるように熱延鋼板の上面エッジ部をエッジマスクによりマスクして熱延鋼板エッジ部の過冷却を防止する技術が記載されている。 Steel bars used as parts for automobiles and construction machinery are usually formed by heating a steel slab (bloom), which has been cast into a rectangular cross section with a continuous casting machine, to a predetermined temperature in a heating furnace, and then using a rough rolling mill with a rectangular cross section. And then rolled into a circular cross section with a finishing mill.
In this case, in order to improve the mechanical properties such as toughness, the finish rolling temperature is lowered by leaving the steel slab rolled into a square cross section with a roughing mill until it cools to a predetermined temperature. Yes. Therefore, it is expected that cooling efficiency can be improved by cooling to a predetermined temperature with a water cooling device. However, as a water-cooling device for cooling a steel slab rolled into a square cross-section with a rough rolling mill, when using a system that cools the steel slab by blowing cooling water over the entire surface of the steel slab, Is overcooled by the cooling water, which makes it difficult to produce a steel bar having a uniform material.
Such a problem also occurs when the hot-rolled steel sheet is water-cooled in the hot rolling process, and Patent Document 1 discloses that the cooling water from the spray header is sprayed only on the center of the upper surface of the hot-rolled steel sheet. A technique for preventing overcooling of an edge portion of a hot-rolled steel sheet by masking the upper edge portion of the rolled steel sheet with an edge mask is described.

特開平１０−１３７８３２号公報（００１０−００１３）JP-A-10-137832 (0010-0013)

しかしながら、粗圧延機で断面矩形状に圧延された鋼片を水冷装置により冷却する際に特許文献１に記載された技術を適用すると、図５に示すように、粗圧延後の鋼片である中間圧延素材４の上側角部４ａ，４ｂが過冷却となることを防止できるが、中間圧延素材４の下側角部４ｂ，４ｃは下方からの冷却水８と左右方向からの冷却水８によって過冷却されてしまうという問題がある。
本発明は上述した事情に鑑みてなされたものであり、その目的は、粗圧延機で断面方形状に圧延された鋼片を水冷装置により所定温度に冷却する際に、鋼片の角部が冷却水によって過度に冷却されることを抑制して材質の均一な棒鋼を製造することのできる棒鋼の製造方法を提供することにある。 However, when the technique described in Patent Document 1 is applied to cool a steel slab rolled into a rectangular cross section with a rough rolling mill with a water cooling device, the steel slab after rough rolling is obtained as shown in FIG. Although it is possible to prevent the upper corners 4a and 4b of the intermediate rolled material 4 from being overcooled, the lower corners 4b and 4c of the intermediate rolled material 4 are formed by the cooling water 8 from below and the cooling water 8 from the left and right directions. There is a problem of being overcooled.
The present invention has been made in view of the above-described circumstances. The purpose of the present invention is to reduce the corner of the steel slab when the steel slab rolled into a square cross section by a roughing mill is cooled to a predetermined temperature by a water cooling device. An object of the present invention is to provide a method of manufacturing a steel bar that can suppress the excessive cooling by cooling water and manufacture a steel bar having a uniform material.

上記課題を解決するために、本発明の請求項１に係る発明は、鋼片を所定温度に加熱した後、断面方形状に粗圧延し、次いで前記鋼片を水冷装置により所定温度に冷却した後、断面円形状に仕上圧延して棒鋼を製造する方法であって、前記水冷装置で冷却水を前記鋼片の上下面全体に吹き付けると共に、前記鋼片の表面で跳ね返る圧力の冷却水を前記鋼片の左右側面中央部に吹き付けて前記鋼片を所定温度に冷却することを特徴とする。   In order to solve the above-mentioned problem, in the invention according to claim 1 of the present invention, a steel slab is heated to a predetermined temperature, and then roughly rolled into a square cross section, and then the steel slab is cooled to a predetermined temperature by a water cooling device. Then, a method of producing a steel bar by finish rolling into a circular cross section, wherein the cooling water is sprayed on the entire upper and lower surfaces of the steel slab by the water cooling device, and the cooling water having a pressure that rebounds on the surface of the steel slab The steel slab is cooled to a predetermined temperature by spraying on the left and right side central portions of the steel slab.

本発明の請求項２に係る発明は、請求項１に記載の棒鋼の製造方法において、前記水冷装置として、前記冷却水を左右方向から噴射して前記左右側面中央部に吹き付ける複数の冷却水噴射ノズルを上下に配列し、該複数の冷却水噴射ノズルへの給水を遮断する複数の給水遮断弁と、該給水遮断弁を前記鋼片の厚さに応じて開閉制御する制御装置とを有する水冷装置を用いて、前記鋼片を所定温度に冷却することを特徴とする。   The invention according to claim 2 of the present invention is the method of manufacturing a steel bar according to claim 1, wherein the water cooling device is a plurality of cooling water jets that spray the cooling water from the left and right directions and spray the left and right side surface central portions. Water cooling having a plurality of water supply shut-off valves arranged vertically and shutting off water supply to the plurality of cooling water injection nozzles, and a control device for controlling opening / closing of the water supply shut-off valves in accordance with the thickness of the steel slab The steel slab is cooled to a predetermined temperature using an apparatus.

請求項１に係る発明によれば、粗圧延機で断面方形状に圧延された鋼片を水冷装置により所定温度に冷却するに際して、冷却水を鋼片の上下面全体に吹き付けると共に、鋼片の表面で跳ね返る圧力の冷却水を鋼片の左右側面中央部に吹き付けることで、鋼片の左右側面中央部に吹き付けられた冷却水は鋼片の側面で左右方向に跳ね返るので、鋼片の角部が冷却水によって過度に冷却されることを抑制して材質の均一な棒鋼を製造することができる。
請求項２に係る発明によれば、水冷装置の冷却水噴射ノズルから鋼片の左右側面に噴射される冷却水の噴射領域を粗圧延機で断面方形状に圧延された鋼片の厚さに応じて任意に調整することができる。 According to the first aspect of the present invention, when cooling a steel slab rolled into a square cross section with a roughing mill to a predetermined temperature by a water cooling device, the cooling water is sprayed on the entire upper and lower surfaces of the steel slab, By blowing cooling water with a pressure that bounces on the surface to the center of the left and right sides of the steel slab, the cooling water sprayed to the center of the left and right side of the steel slab rebounds in the left and right direction on the side of the steel slab. It is possible to manufacture a steel bar having a uniform material while suppressing excessive cooling by cooling water.
According to the invention which concerns on Claim 2, the injection area | region of the cooling water injected from the cooling water injection nozzle of a water-cooling apparatus to the right-and-left side surface of a steel slab is made into the thickness of the steel slab rolled into the cross-sectional square shape with the rough rolling mill. It can be arbitrarily adjusted accordingly.

棒鋼製造設備の一例を示す図である。It is a figure which shows an example of a steel bar manufacturing facility. 図１のＡ−Ａ断面を示す図である。It is a figure which shows the AA cross section of FIG. 粗圧延後の鋼片である中間圧延素材の冷却から仕上圧延に至るまでの温度変化を伝熱解析によって求めた結果を示す図である。It is a figure which shows the result of having calculated | required the temperature change from the cooling of the intermediate rolling raw material which is the steel slab after rough rolling to finish rolling by heat-transfer analysis. 粗圧延後の鋼片厚さが大きい場合の冷却水の噴射領域を示す図である。It is a figure which shows the injection area | region of the cooling water in case the steel piece thickness after rough rolling is large. 本発明が解決しようとする課題を説明するための図である。It is a figure for demonstrating the subject which this invention tends to solve.

以下、図１〜図４を参照して本発明の一実施形態について説明する。
図中符号１は連続鋳造機で断面矩形状に鋳造された鋼片（ブルーム）２を加熱する加熱炉であって、この加熱炉１で加熱された鋼片２は図示しない搬送ローラテーブルにより粗圧延機３に搬送されるようになっている。
粗圧延機３は加熱炉１で加熱された鋼片２を正方形の断面形状に圧延するものであって、この粗圧延機３で圧延された鋼片２は断面が正方形の中間圧延素材４となり、粗圧延機３の後段に設置された水冷装置５に供給されるようになっている。 Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
In the figure, reference numeral 1 denotes a heating furnace for heating a steel slab (bloom) 2 cast in a rectangular cross section by a continuous casting machine. The steel slab 2 heated in the heating furnace 1 is roughened by a conveying roller table (not shown). It is conveyed to the rolling mill 3.
The rough rolling mill 3 rolls the steel slab 2 heated in the heating furnace 1 into a square cross-sectional shape, and the steel slab 2 rolled by the rough rolling mill 3 becomes an intermediate rolling material 4 having a square cross section. The water cooling device 5 installed in the subsequent stage of the rough rolling mill 3 is supplied.

水冷装置５は粗圧延機３で圧延された鋼片である中間圧延素材４を所定温度に冷却するものであって、この水冷装置５で冷却された中間圧延素材４は仕上圧延機６に供給され、ここで断面円形状に仕上圧延されることによって棒鋼７となる。
図２に示すように、水冷装置５は中間圧延素材４の表面に冷却水８Ａ，８Ｂを上下方向と左右方向から噴射する複数の冷却水噴射ノズル９Ａ，９Ｂを有し、これらの冷却水噴射ノズル９Ａ，９Ｂのうち冷却水噴射ノズル９Ｂは複数の冷却水噴射ノズルが上下方向に配列されるとともに、中間圧延素材４の表面で跳ね返る圧力の冷却水８Ｂを噴出するように構成されている。 The water cooling device 5 cools the intermediate rolling material 4, which is a steel slab rolled by the rough rolling mill 3, to a predetermined temperature. The intermediate rolling material 4 cooled by the water cooling device 5 is supplied to the finishing mill 6. Here, the steel bar 7 is formed by finish rolling into a circular cross section.
As shown in FIG. 2, the water cooling device 5 has a plurality of cooling water injection nozzles 9A and 9B for injecting cooling water 8A and 8B from the vertical direction and the horizontal direction on the surface of the intermediate rolling material 4, and these cooling water injections. Among the nozzles 9 </ b> A and 9 </ b> B, the cooling water injection nozzle 9 </ b> B is configured such that a plurality of cooling water injection nozzles are arranged in the vertical direction and the cooling water 8 </ b> B having a pressure that rebounds on the surface of the intermediate rolling material 4 is ejected.

また、水冷装置５は冷却水噴射ノズル９Ｂへの給水を遮断する複数の給水遮断弁１０と、これらの給水遮断弁１０を開閉制御する制御装置１１とを有し、制御装置１１は中間圧延素材４の厚さに応じて給水遮断弁１０を開閉制御するように構成されている。
加熱炉１で加熱された鋼片２を熱間圧延して棒鋼７を製造する際に、粗圧延機３で断面方形状に圧延された鋼片である中間圧延素材４を冷却する水冷装置として、図２に示した水冷装置５を用いると、水冷装置５の冷却水噴射ノズル９Ａから噴出した冷却水８Ａは中間圧延素材４の上下面全体に吹き付けられ、水冷装置５の冷却水噴射ノズル９Ｂから噴出した冷却水８Ｂは中間圧延素材４の左右側面中央部に吹き付けられる。このとき、冷却水噴射ノズル９Ｂから中間圧延素材４の左右側面中央部に吹き付けられた冷却水８Ｂは、図２に示すように、中間圧延素材４の側面で左右方向に跳ね返るので、冷却水噴射ノズル９Ａ，９Ｂからの冷却水８Ａ，８Ｂによって中間圧延素材４の角部４ａ，４ｂ，４ｃ，４ｄが過度に冷却されることはない。 The water cooling device 5 has a plurality of water supply shutoff valves 10 that shut off the water supply to the coolant injection nozzle 9B, and a control device 11 that controls the opening and closing of these water supply shutoff valves 10, and the control device 11 is an intermediate rolling material. The water supply shutoff valve 10 is controlled to be opened and closed according to the thickness of 4.
As a water-cooling device that cools the intermediate rolling material 4 that is a steel piece rolled into a square cross section by a roughing mill 3 when the steel piece 2 heated in the heating furnace 1 is hot-rolled to produce a bar steel 7. When the water cooling device 5 shown in FIG. 2 is used, the cooling water 8A ejected from the cooling water injection nozzle 9A of the water cooling device 5 is sprayed on the entire upper and lower surfaces of the intermediate rolling material 4, and the cooling water injection nozzle 9B of the water cooling device 5 is used. The cooling water 8 </ b> B ejected from the center is sprayed to the left and right side central portions of the intermediate rolled material 4. At this time, the cooling water 8B sprayed from the cooling water injection nozzle 9B to the center of the left and right side surfaces of the intermediate rolling material 4 bounces in the left and right directions on the side surface of the intermediate rolling material 4 as shown in FIG. The corners 4a, 4b, 4c, 4d of the intermediate rolled material 4 are not excessively cooled by the cooling water 8A, 8B from the nozzles 9A, 9B.

図３は中間圧延素材４の冷却から仕上圧延に至るまでの温度変化を伝熱解析によって求めた結果を示し、図３からも明らかなように、水冷装置５で冷却された中間圧延素材４は各面で均一な温度分布となって仕上圧延が開始される。
従って、上述した本発明の一実施形態のように、水冷装置５で冷却水８Ａを中間圧延素材４の上下面全体に吹き付けると共に、中間圧延素材４の表面で跳ね返る圧力の冷却水８Ｂを中間圧延素材４の左右側面中央部に吹き付けることで、中間圧延素材４を水冷装置５で所定温度に冷却する際に中間圧延素材４の角部４ａ，４ｂ，４ｃ，４ｄが過度に冷却されてしまうことがないので、材質の均一な棒鋼７を製造することができる。 FIG. 3 shows the result of obtaining the temperature change from the cooling of the intermediate rolling material 4 to the finish rolling by heat transfer analysis. As is clear from FIG. 3, the intermediate rolling material 4 cooled by the water cooling device 5 is Finish rolling starts with a uniform temperature distribution on each surface.
Therefore, as in the above-described embodiment of the present invention, the cooling water 8A is sprayed on the entire upper and lower surfaces of the intermediate rolling material 4 by the water cooling device 5, and the cooling water 8B having a pressure that rebounds on the surface of the intermediate rolling material 4 is intermediate-rolled. By spraying the central part of the left and right side surfaces of the material 4, the corners 4 a, 4 b, 4 c and 4 d of the intermediate rolled material 4 are excessively cooled when the intermediate rolled material 4 is cooled to a predetermined temperature by the water cooling device 5. Therefore, the steel bar 7 having a uniform material can be manufactured.

また、中間圧延素材４を冷却する水冷装置として、上述した本発明の一実施形態のように、中間圧延素材４の表面に冷却水８Ａ，８Ｂを上下方向と左右方向から噴射する複数の冷却水噴射ノズル９Ａ，９Ｂと、これらの冷却水噴射ノズル９Ａ，９Ｂのうち冷却水８Ｂを左右方向から噴射する冷却水噴射ノズル９Ｂへの給水を遮断する複数の給水遮断弁１０と、これらの給水遮断弁１０を中間圧延素材４の厚さに応じて開閉制御する制御装置１１とを有する水冷装置５を用いると、図２及び図４に示すように、冷却水噴射ノズル９Ｂから中間圧延素材４の表面に噴射される冷却水８Ｂの噴射領域を中間圧延素材４の厚さに応じて任意に調節することができる。
次に、表１を参照して、本発明の実施例と比較例について説明する。 Moreover, as a water-cooling device for cooling the intermediate rolling material 4, a plurality of cooling waters that inject cooling water 8 </ b> A, 8 </ b> B onto the surface of the intermediate rolling material 4 from the vertical direction and the horizontal direction as in the above-described embodiment of the present invention. Injection nozzles 9A, 9B, a plurality of water supply cutoff valves 10 for blocking water supply to cooling water injection nozzles 9B for injecting cooling water 8B from the left and right directions among these cooling water injection nozzles 9A, 9B, and these water supply cutoffs When the water cooling device 5 having the control device 11 that controls the opening and closing of the valve 10 according to the thickness of the intermediate rolling material 4 is used, as shown in FIG. 2 and FIG. The spray region of the cooling water 8B sprayed on the surface can be arbitrarily adjusted according to the thickness of the intermediate rolling material 4.
Next, referring to Table 1, examples of the present invention and comparative examples will be described.

Figure 2012024805
Figure 2012024805

表１の実施例は、中間圧延素材を図２に示した水冷装置により冷却した後、仕上圧延を施して得られた棒鋼（直径１８０ｍｍ）の仕上圧延終了直後の表面温度を放射温度計によって測定すると共に棒鋼の機械的特性を調査した結果を示している。
また、表１の比較例は中間圧延素材を図５に示す方法で冷却した後、仕上圧延を施して得られた棒鋼（直径１８０ｍｍ）の仕上圧延終了直後の表面温度を放射温度計によって測定すると共に棒鋼の機械的特性を調査した結果を示している。 In the examples of Table 1, the surface temperature immediately after finishing rolling of a steel bar (diameter: 180 mm) obtained by performing finish rolling after cooling the intermediate rolling material with the water-cooling device shown in FIG. 2 is measured by a radiation thermometer. And the result of investigating the mechanical properties of steel bars is shown.
Moreover, the comparative example of Table 1 measures the surface temperature immediately after completion | finish of finish rolling of the steel bar (diameter 180mm) obtained by performing finish rolling after cooling an intermediate rolling raw material by the method shown in FIG. In addition, the results of the investigation of the mechanical properties of steel bars are shown.

表１の実施例と比較例とを比較すると、比較例では棒鋼の仕上圧延終了直後の表面温度が６１０〜７５０℃であるのに対し、実施例では棒鋼の仕上圧延終了直後の表面温度が６５０〜７５０℃となり、比較例よりも温度分布のバラツキが小さいことがわかる。
また、比較例では棒鋼の引張り強度が８７７〜９５０ＭＰａであるのに対し、実施例では棒鋼の引張り強度が８８１〜９０２ＭＰａとなり、比較例よりも引張り強度のバラツキが小さいことがわかる。 Comparing the examples in Table 1 with the comparative examples, the surface temperature immediately after the finish rolling of the steel bar is 610 to 750 ° C. in the comparative example, whereas the surface temperature immediately after the finish rolling of the steel bar is 650 in the working example. It is ˜750 ° C., and it can be seen that the variation in temperature distribution is smaller than that of the comparative example.
Further, in the comparative example, the tensile strength of the steel bar is 877 to 950 MPa, whereas in the example, the tensile strength of the steel bar is 881 to 902 MPa, which shows that the variation in tensile strength is smaller than that of the comparative example.

１…加熱炉
２…鋼片
３…粗圧延機
４…中間圧延素材
４ａ，４ｂ，４ｃ，４ｄ…中間圧延素材の角部
５…水冷装置
６…仕上圧延機
７…棒鋼
８Ａ，８Ｂ…冷却水
９Ａ，９Ｂ…冷却水噴射ノズル
１０…給水遮断弁
１１…制御装置 DESCRIPTION OF SYMBOLS 1 ... Heating furnace 2 ... Steel slab 3 ... Rough rolling mill 4 ... Intermediate rolling raw material 4a, 4b, 4c, 4d ... Corner part of intermediate rolling raw material 5 ... Water cooling device 6 ... Finishing rolling mill 7 ... Bar steel 8A, 8B ... Cooling water 9A, 9B ... Cooling water injection nozzle 10 ... Feed water shutoff valve 11 ... Control device

Claims (2)

鋼片を所定温度に加熱した後、断面方形状に粗圧延し、次いで前記鋼片を水冷装置により所定温度に冷却した後、断面円形状に仕上圧延して棒鋼を製造する方法であって、前記水冷装置で冷却水を前記鋼片の上下面全体に吹き付けると共に、前記鋼片の表面で跳ね返る圧力の冷却水を前記鋼片の左右側面中央部に吹き付けて前記鋼片を所定温度に冷却することを特徴とする棒鋼の製造方法。   After heating the steel slab to a predetermined temperature, roughly rolling into a cross-sectional square shape, and then cooling the steel slab to a predetermined temperature with a water cooling device, then finish rolling into a circular cross-sectional shape to produce a steel bar, Cooling water is sprayed on the entire upper and lower surfaces of the steel slab by the water cooling device, and cooling water having a pressure that rebounds on the surface of the steel slab is sprayed on the left and right side central portions of the steel slab to cool the steel slab to a predetermined temperature. The manufacturing method of the steel bar characterized by the above-mentioned. 請求項１に記載の棒鋼の製造方法において、前記水冷装置として、前記冷却水を左右方向から噴射して前記左右側面中央部に吹き付ける複数の冷却水噴射ノズルを上下に配列し、該複数の冷却水噴射ノズルへの給水を遮断する複数の給水遮断弁と、該給水遮断弁を前記鋼片の厚さに応じて開閉制御する制御装置とを有する水冷装置を用いて、前記鋼片を所定温度に冷却することを特徴とする棒鋼の製造方法。   In the manufacturing method of the steel bar according to claim 1, as said water cooling device, a plurality of cooling water injection nozzles which inject the cooling water from the left-right direction and spray the cooling water on the center of the left and right side surfaces are arranged up and down. Using a water cooling device having a plurality of water supply shutoff valves for shutting off water supply to the water injection nozzle and a control device for opening and closing the water supply shutoff valve according to the thickness of the steel billet, the steel slab is heated to a predetermined temperature. A method for producing a steel bar, characterized by being cooled.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103264047A (en) * 2013-04-26 2013-08-28 首钢总公司 Roughing method for improving surface quality of low-carbon steel wire rods
CN113333484A (en) * 2021-05-27 2021-09-03 安徽首矿大昌金属材料有限公司 Technological method for improving phenomenon of shearing bend of bar hot-rolled ribbed steel bar
CN113751678A (en) * 2021-09-08 2021-12-07 广东华域重工有限公司 Production process and processing equipment of high-strength heavy steel

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Publication number Priority date Publication date Assignee Title
JPS63123661U (en) * 1987-02-05 1988-08-11
JPS63213622A (en) * 1987-03-03 1988-09-06 Kawasaki Steel Corp Device for conditioning and cooling crude square billet
JPS63143561U (en) * 1987-03-09 1988-09-21
JPH01312033A (en) * 1988-06-13 1989-12-15 Toa Steel Co Ltd Manufacture of soft steel bar

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63123661U (en) * 1987-02-05 1988-08-11
JPS63213622A (en) * 1987-03-03 1988-09-06 Kawasaki Steel Corp Device for conditioning and cooling crude square billet
JPS63143561U (en) * 1987-03-09 1988-09-21
JPH01312033A (en) * 1988-06-13 1989-12-15 Toa Steel Co Ltd Manufacture of soft steel bar

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103264047A (en) * 2013-04-26 2013-08-28 首钢总公司 Roughing method for improving surface quality of low-carbon steel wire rods
CN113333484A (en) * 2021-05-27 2021-09-03 安徽首矿大昌金属材料有限公司 Technological method for improving phenomenon of shearing bend of bar hot-rolled ribbed steel bar
CN113751678A (en) * 2021-09-08 2021-12-07 广东华域重工有限公司 Production process and processing equipment of high-strength heavy steel
CN113751678B (en) * 2021-09-08 2023-06-20 广东华域重工有限公司 High-strength heavy steel production process and processing equipment thereof

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