JP2014189886A - Production method of extra thickness martensitic stainless thick steel plate excellent in inner quality characteristic, and extra thickness martensitic stainless thick steel plate excellent in inner quality characteristic - Google Patents
Production method of extra thickness martensitic stainless thick steel plate excellent in inner quality characteristic, and extra thickness martensitic stainless thick steel plate excellent in inner quality characteristic Download PDFInfo
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本発明は、連続鋳造スラブにより内質特性の極めて良好な極厚マルテンサイト系ステンレス厚鋼板(製品板厚80mm以上230mm以下のJISG4304(SUS410/SUS410S)ASTMA240TP410S)を製造する方法およびそれにより製造される内質特性に優れた極厚マルテンサイト系ステンレス厚鋼板に関する。 The present invention is a method for producing an extremely thick martensitic stainless steel plate (JIS G4304 (SUS410 / SUS410S) ASTM A240TP410S having a product plate thickness of 80 mm or more and 230 mm or less) having extremely good internal properties by continuous casting slabs, and the same. The present invention relates to a very thick martensitic stainless steel plate with excellent internal properties.
一般に厚鋼板は、連続鋳造スラブ、または鋳型鋳造したインゴットを分塊圧延した造塊スラブを素材として製造される。両者を比較すると、製造コストの点では前者の方に魅力があるが、連続鋳造スラブの場合、造塊スラブよりも厚みが薄い為、極厚鋼板の製造では、センターポロシティーの未圧着部分が残存する割合が高い。 In general, a thick steel plate is manufactured using a continuous cast slab or an ingot slab obtained by ingot casting a cast ingot. Comparing the two, the former is more attractive in terms of production cost, but in the case of continuous cast slabs, the thickness is thinner than the ingot slab, so in the production of extra-thick steel plates, the unbonded part of the center porosity is The remaining ratio is high.
現状の厚板圧延機の能力では、連続鋳造スラブの板厚中心位置に必然的に発生するセンターポロシティーを安定して消滅させる事は困難である。連続鋳造スラブから製造された極厚鋼板に超音波探傷試験を実施すると、圧下率が小さくなるに伴い、鋼板内質不良による欠陥の検出数が増加する。 With the current capacity of the plate mill, it is difficult to stably eliminate the center porosity that inevitably occurs at the center of the plate thickness of the continuous cast slab. When an ultrasonic flaw detection test is performed on an extremely thick steel plate manufactured from a continuously cast slab, the number of defects detected due to poor quality of the steel plate increases as the rolling reduction decreases.
そのため、連続鋳造スラブを用いた極厚鋼板の製造では、圧下比(スラブ厚/製品厚)に下限値を設けることが一般的に行われ、例えば、圧力容器用鋼板の一般製造条件を規定したASTM A20では、この圧下比の下限値を3以上に規定している。JIS規格にはこのような規定はないが、鋼板製造業者が自主的に管理を行い、製造を行っている。 Therefore, in the production of extra-thick steel plates using continuous cast slabs, it is common practice to set a lower limit for the rolling ratio (slab thickness / product thickness), and for example, the general production conditions for steel plates for pressure vessels are defined. In ASTM A20, the lower limit value of this reduction ratio is defined as 3 or more. Although there are no such rules in the JIS standard, the steel sheet manufacturer performs the management and manufactures independently.
下限値を下回るような加工条件で極厚鋼板を製造しなければならない時には、造塊スラブを用いていたが、製造プロセス上、押湯部や沈澱晶部の非定常部分の切り捨てや分塊圧延を必要とする為、コストの増大や生産性低下を招いていた。 When extremely thick steel plates had to be manufactured under processing conditions that were below the lower limit, ingot slabs were used, but in the manufacturing process, unsteady portions of feeders and precipitated crystal parts were cut off or split rolled. , Leading to increased costs and reduced productivity.
連続鋳造スラブにより、圧下比が小さくとも、鋼板内質特性に優れた極厚鋼板を製造する事が望ましく、その為に幾つかの提案がなされている。 Even though the rolling ratio is small, it is desirable to produce an ultra-thick steel plate that is excellent in the quality of the steel plate, and several proposals have been made for this purpose.
非特許文献1には、圧延形状比で定義される数値を大きくする事により、鋼板内質の良好な鋼板を製造する技術が開示されている。特許文献1、2には、連続鋳造機の出側でロールまたは平金敷による圧下を施す事によって、連続鋳造スラブのセンターポロシティーの消滅を図る技術が開示されている。
Non-Patent Document 1 discloses a technique for manufacturing a steel plate with good steel sheet quality by increasing the numerical value defined by the rolling shape ratio.
特許文献3には、全圧下率が20〜60%の加工条件で125mm厚以上の極厚鋼板を製造する際、厚板圧延に先立ち、連続鋳造スラブの端部を幅方向から鍛造圧下し、元スラブの幅から150mm以上減尺させると共に肥厚化させ、スラブ厚方向の鍛造圧下を行う事によって、センターポロシティーを消滅させる技術が開示されている。 In Patent Document 3, when producing an extremely thick steel plate having a total reduction ratio of 20 to 60% under a thickness of 125 mm or more, prior to thick plate rolling, the end of the continuous cast slab is forged and reduced from the width direction, A technique for eliminating the center porosity by reducing the width of the original slab by 150 mm or more and increasing the thickness and forging reduction in the slab thickness direction is disclosed.
しかしながら、非特許文献1の技術では、鋼板内質の良好な極厚鋼板を得る為に必要な圧延形状比が圧延機の設備仕様により制約される範囲の上限を超える為、実用性に乏しく、特許文献1、2の技術では、厚板素材用連続鋳造機の設備改良にコストがかかり過ぎるという問題がある。特許文献3の技術は、実施例の対象が一般用40キロ級鋼、一般用50キロ級鋼、および高炭素鋼で、これらの鋼種と高温強度が相違するSUS410に代表されるマルテンサイト系ステンレス厚鋼板での効果は不明である。
However, in the technique of Non-Patent Document 1, since the rolling shape ratio necessary for obtaining a very thick steel plate with good steel plate quality exceeds the upper limit of the range restricted by the equipment specifications of the rolling mill, the practicality is poor. In the techniques of
本発明は上記課題を解決するためになされたもので、連続鋳造スラブより既存の設備を用いて製造される、鋼板内質特性の極めて良好な、製品板厚が80mm以上230mm以下の極厚マルテンサイト系ステンレス厚鋼板(例えばJIS G 4304 (SUS410/SUS410S) ASTM A240 TP410S)の製造方法およびそれにより製造される極厚オーステナイト系ステンレス厚鋼板を提供することを目的とする。 The present invention has been made in order to solve the above-mentioned problems, and is an extremely thick martens manufactured by using existing equipment from a continuous casting slab and having extremely good steel sheet quality and having a product thickness of 80 mm or more and 230 mm or less. It is an object of the present invention to provide a method for manufacturing a site-based stainless steel plate (for example, JIS G 4304 (SUS410 / SUS410S) ASTM A240 TP410S) and an extra-thick austenitic stainless steel plate manufactured thereby.
本発明者等は、上記目的を達成すべく種々検討を行い、以下の知見を得た。なお、本発明では、センターポロシティー、ザク性欠陥をまとめてセンターポロシティーと称する。
1.連続鋳造によるスラブの両幅端部における3面冷却部、特に端部よりスラブ厚相当内部の領域に、スラブの幅方向中央部に生成するセンターポロシティーより、大きなサイズのセンターポロシティーが生成する内部不良域が存在し、鍛造または圧延におけるスラブ厚中心位置の塑性歪量が十分でない場合、残存し、鋼板内質不良となる。
2.上記内部不良域は、スラブの幅方向両端部を幅方向から鍛造圧下して両端部を肥厚化させた後、圧下率を適正に規定した鍛造法を適用すれば、消滅させることが可能である。
3.上記内部不良域のセンターポロシティーを消滅させれば、スラブの幅方向中央部に生成するセンターポロシティーも同時に消滅する。
The inventors of the present invention have made various studies to achieve the above object, and have obtained the following knowledge. In the present invention, the center porosity and the zaku defect are collectively referred to as center porosity.
1. A center porosity with a larger size than the center porosity generated in the center in the width direction of the slab is generated in the three-surface cooling part at both width ends of the slab by continuous casting, particularly in the region corresponding to the slab thickness from the end. If there is an internal defect area and the amount of plastic strain at the center of the slab thickness in forging or rolling is not sufficient, it remains, resulting in poor quality of the steel sheet.
2. The internal defective area can be extinguished by applying a forging method in which the reduction ratio is properly defined after forging the both ends in the width direction of the slab from the width direction and thickening the both ends. .
3. If the center porosity of the internal defective area disappears, the center porosity generated at the center in the width direction of the slab also disappears at the same time.
本発明は得られた知見を基に更に検討を加えてなされたもので、すなわち、本発明は、(1)以下の工程を備えた80mm厚以上の極厚マルテンサイト系ステンレス鋼板の製造方法。1.連続鋳造によるスラブを1010℃〜1150℃の範囲で加熱し、スラブの幅方向の両端部を幅方向から鍛造圧下し、スラブ幅を300mm以上減尺させて、両端部を肥厚化させる工程。
2.上下対称の鍛造金型により、AC1変態点(830℃)以上の温度でスラブ厚さ方向に圧下率10%超えで圧下する鍛造を行う工程。
3.その後、1090℃〜1150℃の範囲でスラブを加熱し、上記2での鍛造の圧下率と圧延の圧下率を合計した全圧下率が20%以上60%未満の加工条件で圧延を行う工程。
(2)80mm厚以上で、スラブ圧延垂直方向 全幅、板厚の1/2厚±10mm位置における0.1mmφ〜1.0mmφ径のポロシティーの数が10個/100mm以下であることを特徴とする内質特性に優れた極厚マルテンサイト系ステンレス鋼板。
(3) 請求項2に加えマルテンサイト分率が10%未満である内質特性に優れた極厚マルテンサイト系ステンレス鋼板。
The present invention has been made by further study based on the obtained knowledge. That is, the present invention is (1) a method for producing an extra-thick martensitic stainless steel sheet having a thickness of 80 mm or more, comprising the following steps. 1. A step of heating a slab by continuous casting in a range of 1010 ° C. to 1150 ° C., forging down both ends in the width direction of the slab, reducing the slab width by 300 mm or more, and thickening the both ends.
2. The forging die vertically symmetric, A C1 transformation point (830 ° C.) or more from the step of forging the reduction in beyond a reduction ratio of 10% slab thickness direction at a temperature.
3. Thereafter, the slab is heated in the range of 1090 ° C. to 1150 ° C., and the rolling is performed under the processing conditions in which the total reduction ratio of the forging and the rolling reduction ratio in 2 is 20% or more and less than 60%.
(2) The number of porosity of 0.1 mmφ to 1.0 mmφ diameter is 10/100 mm or less at 80 mm thickness or more in the slab rolling vertical direction full width, 1/2 thickness of plate thickness ± 10 mm position Extremely thick martensitic stainless steel sheet with excellent internal properties.
(3) An extra-thick martensitic stainless steel sheet excellent in internal properties, in addition to
本発明によれば、従来、分塊スラブを素材として製造していた極厚マルテンサイト系ステンレス厚鋼板を、既設の鍛造プレス機を用いて、連続鋳造スラブのセンターポロシティーを完全に消滅させて製造でき、産業上極めて有用である。 According to the present invention, an ultra-thick martensitic stainless steel plate that has conventionally been manufactured using a block slab as a raw material is used to completely eliminate the center porosity of a continuous cast slab using an existing forging press. It can be manufactured and is extremely useful industrially.
本発明は、スラブの両幅端部の3面冷却部、特に端部よりスラブ厚相当内部の領域(以降この領域を3重点と称す)近傍における内質不良部を消滅させるため、スラブの幅方向の両端部を幅方向から鍛造圧下した後、スラブ厚み方向の圧下率を10%以上とする鍛造を行うことを特徴とする。 In the present invention, the three-surface cooling portion at both width end portions of the slab, particularly the inner quality defective portion in the vicinity of the inner portion of the slab corresponding to the slab thickness (hereinafter, this region is referred to as triple point) is eliminated. After forging the both ends in the direction from the width direction, forging is performed so that the reduction rate in the slab thickness direction is 10% or more.
本発明では、まず、連続鋳造スラブの幅方向両端部を肥厚化した形状にする為、図1に示すように連続鋳造スラブ(1)の幅方向の両端部(E)を、鍛造用の上金敷(2)、下金敷(3)にて、幅方向から圧下し、連続鋳造スラブ(1)の両端部(E)の厚さを大きくする。 In the present invention, first, in order to make the both ends in the width direction of the continuous cast slab thickened, as shown in FIG. 1, the ends (E) in the width direction of the continuous cast slab (1) are The anvil (2) and the lower anvil (3) are pressed down from the width direction to increase the thickness of both ends (E) of the continuous cast slab (1).
連続鋳造によるスラブは1010℃〜1150℃の範囲で加熱する。1010℃未満では、鍛造による変形が十分得られず、1150℃を超えると、高温強度が低下して鍛造による効果が十分得られなくなるため、1010℃〜1150℃とする。 The slab by continuous casting is heated in the range of 1010 ° C to 1150 ° C. If it is less than 1010 ° C., deformation due to forging cannot be obtained sufficiently, and if it exceeds 1150 ° C., the high-temperature strength decreases and the effect due to forging cannot be obtained sufficiently, so that the temperature is set to 1010 ° C. to 1150 ° C.
幅方向圧下による、スラブ幅の減尺代(r)は300mm以上とする。スラブ幅の減尺代(r)を300mm以上とし、その後、鍛造を行うと、厚板圧延の圧下による効果も加味されて、3重点近傍とスラブ幅中央部におけるセンターポロシティを消滅させることが可能である。 The reduction allowance (r) of the slab width due to the reduction in the width direction is set to 300 mm or more. When the reduction allowance (r) of the slab width is set to 300 mm or more and then forging is performed, the center porosity in the vicinity of the triple point and in the center portion of the slab width can be eliminated by taking into account the effect of rolling down the plate. It is.
鍛造は、スラブがAC1変態点(830℃)以上の温度で行い、鍛造金型により、スラブ厚さ方向に圧下率10%以上で圧下する。 Forging, slab performed at a temperature higher than A C1 transformation point (830 ° C.), the forging die is rolling at a reduction ratio of 10% or more slab thickness direction.
スラブ温度がAC1変態点(830℃)未満では、鍛造の効果が十分得られないため、AC1変態点(830℃)以上とする。スラブ厚さ方向の圧下率が10%未満では、3重点近傍とスラブ幅中央部におけるセンターポロシティを消滅させることができないため、10%以上圧下する
鍛造後、スラブを1090℃〜1150℃に加熱し、鍛造の圧下率と圧延の圧下率を合計した全圧下率が20%以上60%未満の加工条件で厚板圧延を行う。スラブ加熱温度が1090℃未満では、合金元素が十分固溶せず、1150℃を超えると、オーステナイト粒径が大きくなりすぎて、靭性が劣化するようになるため、1090℃〜1150℃とする。
If the slab temperature is less than the A C1 transformation point (830 ° C.), the forging effect cannot be obtained sufficiently, so the A C1 transformation point (830 ° C.) or higher is set. If the reduction ratio in the slab thickness direction is less than 10%, the center porosity in the vicinity of the triple point and the center part of the slab width cannot be eliminated, so the reduction is performed by 10% or more. After forging, the slab is heated to 1090 ° C to 1150 ° C. Thick plate rolling is performed under processing conditions in which the total reduction ratio of the forging reduction ratio and the rolling reduction ratio is 20% or more and less than 60%. When the slab heating temperature is less than 1090 ° C., the alloy element is not sufficiently dissolved, and when it exceeds 1150 ° C., the austenite grain size becomes too large and the toughness deteriorates, so that the temperature is set to 1090 ° C. to 1150 ° C.
スラブの厚が110〜350mmの連続鋳造スラブに上述した鍛造を施した後、製品板厚が80mm以上230mm以下の極厚鋼板を圧延するため、鍛造の圧下率と圧延の圧下率を合計した全圧下率を20%以上60%未満とする。全圧下率が20%未満60%以上では、所望する製品板厚の極厚鋼板が得られない。 After forging the above-described forging to a continuous cast slab having a slab thickness of 110 to 350 mm, the ultrathick steel plate having a product plate thickness of 80 mm or more and 230 mm or less is rolled. Therefore, the total reduction ratio of forging and rolling reduction is totaled. The rolling reduction is 20% or more and less than 60%. If the total rolling reduction is less than 20% and 60% or more, an extremely thick steel plate having a desired product thickness cannot be obtained.
本発明法によれば、80mm厚以上で、スラブ圧延垂直方向 全幅、板厚の1/2厚±10mm位置における0.1mmφ〜1.0mmφ径のポロシティーの数が10個/100mm以下である内質特性に優れた極厚マルテンサイト系ステンレス鋼板の製造が可能である。なお、マルテンサイト分率を10%未満とすればさらに材質特性も向上し内質特性および加工性に優れた極厚マルテンサイト系ステンレス鋼板の製造が可能となる。本発明はマルテンサイト系ステンレス鋼であれば、その作用効果が得られ、鋼の成分組成は特に規定しない。 According to the method of the present invention, the number of porosity with a diameter of 0.1 mmφ to 1.0 mmφ at a position of 80 mm thickness or more, full width in the vertical direction of the slab rolling, 1/2 thickness of the plate thickness ± 10 mm, and 10 mm diameter is 10 pieces / 100 mm or less. It is possible to manufacture ultra-thick martensitic stainless steel sheets with excellent internal properties. If the martensite fraction is less than 10%, the material properties are further improved, and it is possible to produce an ultra-thick martensitic stainless steel plate having excellent internal properties and workability. If this invention is a martensitic stainless steel, the effect will be acquired and the component composition of steel will not be prescribed | regulated.
110〜350mm厚の連続鋳造スラブ(JISG4304(SUS410/SUS410S)ASTMA240TP410S)を用いて、鍛造及び厚板圧延の圧下率を変化させ、板厚が79〜228mmの極厚鋼板を製造し、得られた鋼板について超音波探傷試験をJISG0801に準じて実施し、内質特性を調査した。表1に供試鋼の化学成分を示す。 Using a continuous cast slab having a thickness of 110 to 350 mm (JISG4304 (SUS410 / SUS410S) ASTM A240TP410S), the reduction ratio of forging and thick plate rolling was changed, and an extra-thick steel plate having a thickness of 79 to 228 mm was manufactured and obtained. The steel sheet was subjected to an ultrasonic flaw detection test according to JISG0801, and the internal properties were investigated. Table 1 shows the chemical composition of the test steel.
ポロシティーの調査は、スラブの端部から100mmの圧延垂直方向断面について全幅、1/2(中央)までについて0.1mmφ〜1.0mmφのポロシティーを光学顕微鏡(X200)で観察し、その個数を測定し、単位長さあたりの数(個/100mm)を測定した。なお、合否基準は金型用鋼(NKM3)で適用実績がある0.1mmφ〜1.0mmφのポロシティーの個数とし、10個/100mm以下を本発明範囲内とした。 The investigation of the porosity was conducted by observing the porosity of 0.1 mmφ to 1.0 mmφ with an optical microscope (X200) from the end of the slab to the full width of the vertical cross section of 100 mm from the end of the slab to 1/2 (center). And the number per unit length (pieces / 100 mm) was measured. In addition, the pass / fail standard was the number of porosity of 0.1 mmφ to 1.0 mmφ which has been applied in steel for molds (NKM3), and 10/100 mm or less was within the scope of the present invention.
表2に製造条件と試験結果を合わせて示す。本発明法により製造した極厚鋼板(No.6、7、11、13、15〜21、23〜26、28)はいずれも0.1mmφ〜1.0mmφのポロシティーの個数が10個/100mm以下であった。スラブ幅端部の圧下率、鍛造圧下率、全圧下率のいずれか、または複数の条件が本発明範囲外の比較例(No.1〜5、8〜10、12、22、27)は超音波探傷試験結果が不合格であった。 Table 2 shows the manufacturing conditions and test results together. The extremely thick steel plates (No. 6, 7, 11, 13, 15-21, 23-26, 28) manufactured by the method of the present invention each have a porosity of 10 mm / 100 mm with a porosity of 0.1 mmφ to 1.0 mmφ. It was the following. Comparative examples (Nos. 1 to 5, 8 to 10, 12, 22, and 27) out of the scope of the present invention are over any one of the rolling reduction ratio, the forging rolling reduction ratio, the total rolling reduction ratio, or a plurality of conditions of the slab width end. The ultrasonic flaw detection test result was unacceptable.
1 連続鋳造スラブ
2 上金敷
3 下金敷
E 両端部
r 減尺代
1
Claims (3)
2.上下対称の鍛造金型により、AC1変態点(830℃)以上の温度でスラブ厚さ方向に圧下率10%超えで圧下する鍛造を行う工程。
3.その後、1090℃〜1150℃の範囲でスラブを加熱し、上記2での鍛造の圧下率と圧延の圧下率を合計した全圧下率が20%以上60%未満の加工条件で圧延を行う工程。 The manufacturing method of the ultra-thick martensitic stainless steel plate of 80 mm thickness or more provided with the following processes. 1. A step of heating a slab by continuous casting in a range of 1010 ° C. to 1150 ° C., forging down both ends in the width direction of the slab, reducing the slab width by 300 mm or more, and thickening the both ends.
2. The forging die vertically symmetric, A C1 transformation point (830 ° C.) or more from the step of forging the reduction in beyond a reduction ratio of 10% slab thickness direction at a temperature.
3. Thereafter, the slab is heated in the range of 1090 ° C. to 1150 ° C., and the rolling is performed under the processing conditions in which the total reduction ratio of the forging and the rolling reduction ratio in 2 is 20% or more and less than 60%.
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CN114345940A (en) * | 2022-01-07 | 2022-04-15 | 鞍钢股份有限公司 | Shape control method of martensitic stainless steel thick plate for high-hardness die |
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JPH0987746A (en) * | 1995-09-27 | 1997-03-31 | Sumitomo Metal Ind Ltd | Production of martensitic stainless steel strip |
JP2006263730A (en) * | 2005-03-22 | 2006-10-05 | Jfe Steel Kk | Method for manufacturing extra-heavy steel plate very excellent in internal-quality characteristics |
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JPH0987746A (en) * | 1995-09-27 | 1997-03-31 | Sumitomo Metal Ind Ltd | Production of martensitic stainless steel strip |
JP2006263730A (en) * | 2005-03-22 | 2006-10-05 | Jfe Steel Kk | Method for manufacturing extra-heavy steel plate very excellent in internal-quality characteristics |
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CN114345940A (en) * | 2022-01-07 | 2022-04-15 | 鞍钢股份有限公司 | Shape control method of martensitic stainless steel thick plate for high-hardness die |
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