JP2005152998A - Ultra-thick steel plate and method for manufacturing it - Google Patents

Ultra-thick steel plate and method for manufacturing it Download PDF

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JP2005152998A
JP2005152998A JP2003398798A JP2003398798A JP2005152998A JP 2005152998 A JP2005152998 A JP 2005152998A JP 2003398798 A JP2003398798 A JP 2003398798A JP 2003398798 A JP2003398798 A JP 2003398798A JP 2005152998 A JP2005152998 A JP 2005152998A
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thickness
σtcmax
steel plate
thick steel
seff
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Yukio Takashima
由紀雄 高嶋
Kazuo Komata
一夫 小俣
Norimi Wada
典巳 和田
Mitsuo Kudo
光雄 工藤
Toshio Matsuoka
俊夫 松岡
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Jfe Steel Kk
Jfeスチール株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To manufacture an ultra-thick steel plate the internal quality of which is homogenous and the thickness of which is more than 200 mm at a low cost. <P>SOLUTION: By this manufacturing method of the ultra-thick steel plate which is more than 200 mm in thickness, a composite slab is formed by superposing two or more slabs and welding the circumference of the superposing face and the composite slab is hot-rolled under the condition that the effective central stress sum Seff which is defined by the following formula (1). Where, Seff=Σ((σtcmax/k<SB>0</SB>)-1)... (1), in the formula, Σ shows the total sum of the value of each pass through a rolling schedule. However, (σtcmax/k<SB>0</SB>)-1<0 is not added. Further, σtcmax/k<SB>0</SB>=1.67×(ld/hm)+0.5, in the formula, Ld is the projected length of the arc of contact, hm is an average thickness ( the average of the thickness on the inlet side and the thickness on the outlet side ) and k<SB>0</SB>is the deformation resistance. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

この発明は、超極厚鋼板およびその製造方法、詳しくは、2枚以上の鋼板を重ね合わせ互いに圧着したものからなる、内部品質が均一な板厚200mmを超える超極厚鋼板およびその製造方法に関するものである。   The present invention relates to a super-thick steel plate and a method for manufacturing the same, and more particularly to a super-thick steel plate having a uniform internal quality exceeding 200 mm, and a method for manufacturing the same. Is.
板厚が100mmを超える極厚鋼板は、従来から圧力容器や大型構造物等に使用されている。このような極厚鋼板は、その用途の関係から特に内部品質の均一性が要求される。このような極厚鋼板は、インゴット法により鋳造された鋼塊を分塊圧延して製造されていたが、経済性に問題があった。   Ultra-thick steel plates having a thickness exceeding 100 mm have been conventionally used for pressure vessels, large structures, and the like. Such an extra-thick steel plate is required to have a uniform internal quality, in particular, because of its application. Such an extra-thick steel plate has been manufactured by split-rolling a steel ingot cast by the ingot method, but has a problem in economic efficiency.
そこで、特公平7−83946号公報(特許文献1)、特開平2−197383号公報(特許文献2)、特開平4−190902号公報(特許文献3)、特開平4−266402号公報(特許文献4)には、複数枚の連続鋳造スラブを重ね合わせ、重ね合わせ面の四周を溶接して複合スラブを形成し、重ね合わせ面を真空処理した後、熱間圧延して板厚100mm以上の極厚鋼板を製造する方法が記載されている。これらの従来技術では、スラブの接合性の観点から圧下比が規定されており、特許文献1では2以上、特許文献2では3以上、特許文献3および4ではそれぞれ2.5以上である。   Therefore, Japanese Patent Publication No. 7-83946 (Patent Document 1), Japanese Patent Application Laid-Open No. 2-197383 (Patent Document 2), Japanese Patent Application Laid-Open No. 4-190902 (Patent Document 3), Japanese Patent Application Laid-Open No. 4-266402 (Patent Document). In Reference 4), a plurality of continuous cast slabs are overlapped, and the composite surface is formed by welding four rounds of the overlapped surface, and after the overlapped surface is vacuum-treated, it is hot-rolled to have a thickness of 100 mm or more. A method for producing an extra heavy steel sheet is described. In these prior arts, the reduction ratio is defined from the viewpoint of slab jointability, which is 2 or more in Patent Document 1, 3 or more in Patent Document 2, and 2.5 or more in Patent Documents 3 and 4, respectively.
また、特開平6−15466号公報(特許文献5)には、複合スラブの圧下比の低減を目的として、スラブの重ね合わせ面間にアモルファス金属をインサートして、1.6以上の圧下比で圧延する板厚100mm以上の極厚鋼板を製造する方法が開示されている。   Japanese Patent Laid-Open No. 6-15466 (Patent Document 5) discloses that an amorphous metal is inserted between overlapping surfaces of a slab with a reduction ratio of 1.6 or more for the purpose of reducing the reduction ratio of the composite slab. A method of manufacturing a very thick steel plate having a thickness of 100 mm or more to be rolled is disclosed.
特公平7−83946号公報Japanese Patent Publication No. 7-83946 特開平2−197383号公報Japanese Patent Laid-Open No. 2-197383 特開平4−190902号公報Japanese Patent Laid-Open No. 4-190902 特開平4−266402号公報JP-A-4-266402 特開平6−15466号公報JP-A-6-15466
しかしながら、上記従来技術は、次のような問題を有していた。すなわち、特許文献1から4に開示された従来技術は、圧下比が2以上と大きいので、得られた製品板厚も200mm以下である。   However, the above prior art has the following problems. That is, in the prior arts disclosed in Patent Documents 1 to 4, since the reduction ratio is as large as 2 or more, the obtained product plate thickness is also 200 mm or less.
また、特許文献5に開示された従来技術は、圧下比が小さいので、200mm以上の板厚の極厚鋼板を得ることができるものの、高価なアモルファス金属を必要とするので、現実的でない。   In addition, the prior art disclosed in Patent Document 5 has a small reduction ratio, so that an extremely thick steel plate having a thickness of 200 mm or more can be obtained, but an expensive amorphous metal is required, which is not practical.
従って、この発明の目的は、アモルファス金属等の高価なインサート金属を使用することなく、内部品質が均一な板厚200mmを超える超極厚鋼板を得ることにある。   Accordingly, an object of the present invention is to obtain a super-thick steel plate having a uniform internal quality exceeding 200 mm without using an expensive insert metal such as an amorphous metal.
そこで、本願発明者等は、複合スラブの圧延条件を検討した結果、有効中心応力和Seffを所定値以上にすれば、高価なインサート金属を使用することなく複合スラブを熱間圧延するのみで、接合性に優れた板厚200mmを超える極厚鋼板を得ることができるといった知見を得た。   Therefore, as a result of examining the rolling conditions of the composite slab, the inventors of the present application only hot-rolled the composite slab without using an expensive insert metal if the effective central stress sum Seff is a predetermined value or more. The knowledge that the super-thick steel plate exceeding 200 mm in thickness excellent in bondability can be obtained was acquired.
この発明は、上述した知見に基づきなされたものであり、下記を特徴とするものである。   The present invention has been made on the basis of the above-described knowledge, and is characterized by the following.
請求項1記載の発明は、重ね合わされた2枚以上の鋼板が圧延されて互いに接合されている、板厚200mmを超える超極厚鋼板に特徴を有するものである。   The invention described in claim 1 is characterized by a super-thick steel plate having a thickness exceeding 200 mm, in which two or more superposed steel plates are rolled and joined together.
請求項2記載の発明は、2枚以上のスラブを重ね合せ、重ね合わせ面の四周を溶接して複合スラブを形成し、そして、下記(1)式で定義される有効中心応力和Seffが0.3以上の条件で前記複合スラブを熱間圧延して、板厚200mmを超える超極厚鋼板を製造することに特徴を有するものである。   In the invention according to claim 2, two or more slabs are overlapped, and the four laps of the overlapping surfaces are welded to form a composite slab, and the effective center stress sum Seff defined by the following equation (1) is 0. The composite slab is hot-rolled under a condition of 3 or more to produce a super-thick steel plate having a thickness of more than 200 mm.
Seff=Σ〔(σtcmax/k)−1〕 ---(1)
ここで、Σは、圧延スケジュールを通した各パスの値の総和を示す。
但し、(σtcmax/k)−1<0は、加算しない。
Seff = Σ [(σtcmax / k 0 ) -1] --- (1)
Here, Σ indicates the sum of the values of each pass through the rolling schedule.
However, (σtcmax / k 0 ) −1 <0 is not added.
また、σtcmax/k=1.67×(ld/hm)+0.5
ここで、ld:投影接触弧長
hm:平均板厚(入り側板厚と出側板厚の平均)
0:変形抵抗
Further, σtcmax / k 0 = 1.67 × (ld / hm) +0.5
Where ld: projected contact arc length
hm: Average plate thickness (average of input side plate thickness and output side plate thickness)
k 0 : Deformation resistance
この発明によれば、アモルファス金属等の高価なインサート金属を使用することなく、内部品質が均一な板厚200mmを超える極厚鋼板を得ることができる。   According to the present invention, it is possible to obtain a very thick steel plate having a uniform internal quality exceeding a thickness of 200 mm without using an expensive insert metal such as an amorphous metal.
この発明は、高価なインサート金属を使用しない板厚200mmを超える超極厚鋼板およびその製造方法である。製造方法は、2枚以上のスラブを重ね合せ、重ね合わせ面の四周を溶接して形成した複合スラブを、以下に示す有効中心応力和Seffが0.3以上の圧延条件で熱間圧延するものである。   The present invention is a super-thick steel plate having a thickness exceeding 200 mm and does not use an expensive insert metal, and a method for manufacturing the same. The manufacturing method is to hot-roll a composite slab formed by superimposing two or more slabs and welding the four sides of the overlapped surface under rolling conditions where the effective center stress sum Seff shown below is 0.3 or more. It is.
Seff=Σ〔(σtcmax/k)−1〕 ---(1)
ここで、Σは、圧延スケジュールを通した各パスの値の総和を示す。
但し、(σtcmax/k)−1<0は、加算しない。
Seff = Σ [(σtcmax / k 0 ) -1] --- (1)
Here, Σ indicates the sum of the values of each pass through the rolling schedule.
However, (σtcmax / k 0 ) −1 <0 is not added.
また、σtcmax/k=1.67×(ld/hm)+0.5
ここで、ld:投影接触弧長、
hm:平均板厚(入り側板厚と出側板厚の平均)、
0:変形抵抗
である。
Further, σtcmax / k 0 = 1.67 × (ld / hm) +0.5
Where ld: projected contact arc length,
hm: average plate thickness (average of input side plate thickness and output side plate thickness),
k 0 : Deformation resistance.
上記(1)式において、σtcmax/kは、圧延時の板厚方向の圧縮応力と変形抵抗との比であり、モデル圧延実験により圧延時の板厚方向の圧縮応力を測定して定式化した。 In the above equation (1), σtcmax / k 0 is the ratio between the compressive stress in the plate thickness direction during rolling and the deformation resistance, and is formulated by measuring the compressive stress in the plate thickness direction during rolling in a model rolling experiment. did.
2枚のスラブを重ね合わせた場合、合わせ面は、板厚の1/2の位置となる。重ね合わせ面の接合性について検討した結果、有効中心応力和Seffが0.3以上であれば重ね合わせ面は、良好に圧着し、接合部に欠陥が生じないことが分かった。従って、この発明では、有効中心応力和Seffの値を0.3以上に限定した。   When two slabs are overlapped, the mating surface is at a position that is 1/2 the plate thickness. As a result of examining the bondability of the overlapped surface, it was found that if the effective center stress sum Seff is 0.3 or more, the overlapped surface is pressed well and no defect occurs in the bonded portion. Therefore, in this invention, the value of the effective center stress sum Seff is limited to 0.3 or more.
また、3枚以上の奇数枚のスラブを重ね合わせて圧延する場合には、接合面は、板厚の1/2にはならず、より表層に近い位置になる。このような場合、圧延による圧縮応力、ひずみは板厚中心部よりも表層に近い部分の方が大きい。そのため、板厚の1/2の合わせ面が圧着される条件であれば、スラブ枚数が奇数であっても重ね合わせ面は、良好に圧着し、接合部に欠陥が生じないことが分かった。   In addition, in the case where three or more odd-numbered slabs are overlapped and rolled, the joint surface does not become half of the plate thickness but is closer to the surface layer. In such a case, the compressive stress and strain due to rolling are larger in the portion closer to the surface layer than in the central portion of the plate thickness. For this reason, it was found that under the condition that a mating surface having a thickness of ½ is pressure-bonded, even if the number of slabs is an odd number, the overlapping surface is pressure-bonded well and no defect occurs in the joint.
なお、使用するスラブのセンターポロシティは、その大きさが小さなものの方が圧着しやすいため、センターポロシティの大きさが1mm以下のスラブを用いることが好ましい。また、スラブの重ね合わせ面は、ショットブラストや機械研削等の方法により黒皮を除去する。特に、ベルトグラインダーや機械研削等で一定の表面粗さ以下に制御することが望ましい。さらに、重ね合わせ面の四周を溶接した後、公知の適当な手段で合わせ面の間に存在する空気を排気し、真空状態にしてから熱間圧延を行うことが好ましい。   In addition, since the center porosity of the slab to be used is smaller in size, the center porosity is preferably 1 mm or less. Further, the black skin is removed from the superposed surface of the slab by a method such as shot blasting or mechanical grinding. In particular, it is desirable to control the surface roughness below a certain level with a belt grinder or mechanical grinding. Further, it is preferable to perform hot rolling after welding the four circumferences of the overlapping surfaces and exhausting the air existing between the mating surfaces by a known appropriate means to make a vacuum state.
図1に示すように、板厚247mmの連続鋳造スラブ1、1を2枚重ね合わせ、重ね合わせ面の四周を溶接して(溶接部を2で示す)厚さ494mmの複合スラブ3を複数枚形成し、合わせ面の間の空気を排気した後、1250℃に加熱し、有効中心応力和0.3以上の条件で熱間圧延を行って、本発明厚板No.A〜Dを製造した。次に、上述のように形成した複合スラブを、この発明の範囲外の有効中心応力和0.3未満の条件で熱間圧延を行って、比較厚板No.E、Fを製造した。そして、厚板No.A〜Fのそれぞれの内部欠陥を超音波探傷装置により調査した。この結果を表1に示す。表1において、内部欠陥が少なく製品として問題の無いものを〇印、内部欠陥が多く製品とならないものを×印として示した。   As shown in FIG. 1, two continuous cast slabs 1 and 1 each having a thickness of 247 mm are overlapped, and a plurality of composite slabs 3 having a thickness of 494 mm are welded on the four sides of the overlapped surface (welded portion is indicated by 2). After forming and exhausting the air between the mating surfaces, the steel plate is heated to 1250 ° C. and hot-rolled under the condition that the effective center stress sum is 0.3 or more. A to D were produced. Next, the composite slab formed as described above was hot-rolled under the condition that the effective central stress sum outside the scope of the present invention was less than 0.3, and the comparative thick plate No. E and F were produced. And thick plate no. Each internal defect of A to F was investigated by an ultrasonic flaw detector. The results are shown in Table 1. In Table 1, those having few internal defects and having no problem as a product are indicated by “O”, and those having many internal defects and not resulting in a product are indicated by “X”.
表1から明らかなように、本発明厚板No.A〜Dは、製品の内部欠陥が少なく、製品評価として問題がなかった。これに対して、比較厚板No.E、Fは、内部欠陥が多く製品に問題あることが分かった。   As is apparent from Table 1, the present invention thick plate No. AD had few internal defects of a product, and there was no problem as product evaluation. On the other hand, comparative thick plate No. It was found that E and F had many internal defects and had a problem with the product.
以上の結果から、有効中心応力和が0.3以上の条件で複合スラブを熱間圧延すれば、高価なインサート金属を使用することなく、重ね合わせ面の接合部において欠陥のない板厚200mmを超える極厚鋼板が製造できることが確認できた。   From the above results, if the composite slab is hot-rolled under the condition that the effective central stress sum is 0.3 or more, a plate thickness of 200 mm with no defects at the joint portion of the overlapping surface can be obtained without using expensive insert metal. It was confirmed that an extra-thick steel plate exceeding that can be manufactured.
複合スラブを示す概略斜視図である。It is a schematic perspective view which shows a composite slab.
符号の説明Explanation of symbols
1:スラブ
2:溶接部
3:複合スラブ
1: Slab 2: Welded part 3: Composite slab

Claims (2)

  1. 2枚以上の鋼板が重ね合わされ互いに圧着されていることを特徴とする、板厚200mmを超える超極厚鋼板。   An ultra-thick steel plate having a thickness exceeding 200 mm, wherein two or more steel plates are superposed and pressure-bonded to each other.
  2. 2枚以上のスラブを重ね合せ、重ね合わせ面の四周を溶接して複合スラブを形成し、そして、下記(1)式で定義される有効中心応力和Seffが0.3以上の条件で前記複合スラブを熱間圧延することを特徴とする、板厚200mmを超える超極厚鋼板の製造方法。
    Seff=Σ〔(σtcmax/k0)−1〕 ---(1)
    ここで、Σは、圧延スケジュールを通した各パスの値の総和を示す。
    但し、(σtcmax/k0)−1<0は、加算しない。
    また、σtcmax/k0=1.67×(ld/hm)+0.5
    ここで、ld:投影接触弧長
    hm:平均板厚(入り側板厚と出側板厚の平均)
    0:変形抵抗
    Two or more slabs are overlapped, and the combined surface is welded to form a composite slab, and the composite is obtained under the condition that the effective central stress sum Seff defined by the following equation (1) is 0.3 or more. A method for producing a super-thick steel plate having a thickness exceeding 200 mm, wherein the slab is hot-rolled.
    Seff = Σ [(σtcmax / k 0 ) -1] --- (1)
    Here, Σ indicates the sum of the values of each pass through the rolling schedule.
    However, (σtcmax / k 0 ) −1 <0 is not added.
    Also, σtcmax / k 0 = 1.67 × (ld / hm) +0.5
    Where ld: projected contact arc length
    hm: Average plate thickness (average of input side plate thickness and output side plate thickness)
    k 0 : Deformation resistance
JP2003398798A 2003-11-28 2003-11-28 Ultra-thick steel plate and method for manufacturing it Pending JP2005152998A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102649123A (en) * 2011-02-25 2012-08-29 宝山钢铁股份有限公司 Method for producing extra thick composite board through dissymmetrical composite rolling
CN102773243A (en) * 2012-07-27 2012-11-14 济钢集团有限公司 Method for producing medium and thick plates by utilizing waste steel plates
CN104190715A (en) * 2014-09-26 2014-12-10 西部钛业有限责任公司 Ply rolling processing method for TC1 titanium alloy thin plate
WO2015109426A1 (en) * 2014-01-22 2015-07-30 太原科技大学 Method for manufacturing metal compound plate strip by rolling
TWI497834B (en) * 2009-02-27 2015-08-21 Tyco Electronics Corp Cassette for a cable interconnect system
CN105252237A (en) * 2014-07-16 2016-01-20 鞍钢股份有限公司 Method for producing CrMnNiMo series ultra-thick mold compound billets
CN106345810A (en) * 2016-11-07 2017-01-25 湖南宝津新材料科技有限公司 Rolling extending synchronization method
CN108971226A (en) * 2018-06-28 2018-12-11 太原理工大学 A kind of method of the continuous pack rolling metal-based compound plate of popin

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI497834B (en) * 2009-02-27 2015-08-21 Tyco Electronics Corp Cassette for a cable interconnect system
CN102649123A (en) * 2011-02-25 2012-08-29 宝山钢铁股份有限公司 Method for producing extra thick composite board through dissymmetrical composite rolling
CN102773243A (en) * 2012-07-27 2012-11-14 济钢集团有限公司 Method for producing medium and thick plates by utilizing waste steel plates
WO2015109426A1 (en) * 2014-01-22 2015-07-30 太原科技大学 Method for manufacturing metal compound plate strip by rolling
US10363592B2 (en) 2014-01-22 2019-07-30 Taiyuan University Of Science And Technology Method for preparing metal composite plate strip by rolling
CN105252237A (en) * 2014-07-16 2016-01-20 鞍钢股份有限公司 Method for producing CrMnNiMo series ultra-thick mold compound billets
CN105252237B (en) * 2014-07-16 2017-09-26 鞍钢股份有限公司 A kind of production method of the special thick mould composite billet of CrMnNiMo systems
CN104190715A (en) * 2014-09-26 2014-12-10 西部钛业有限责任公司 Ply rolling processing method for TC1 titanium alloy thin plate
CN106345810A (en) * 2016-11-07 2017-01-25 湖南宝津新材料科技有限公司 Rolling extending synchronization method
CN106345810B (en) * 2016-11-07 2018-04-13 湖南宝津新材料科技有限公司 One kind rolling extension synchronous method
CN108971226A (en) * 2018-06-28 2018-12-11 太原理工大学 A kind of method of the continuous pack rolling metal-based compound plate of popin

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