JPS63421A - Novel production of thin austenitic stainless steel sheet having excellent surface characteristic and material quality - Google Patents
Novel production of thin austenitic stainless steel sheet having excellent surface characteristic and material qualityInfo
- Publication number
- JPS63421A JPS63421A JP14143386A JP14143386A JPS63421A JP S63421 A JPS63421 A JP S63421A JP 14143386 A JP14143386 A JP 14143386A JP 14143386 A JP14143386 A JP 14143386A JP S63421 A JPS63421 A JP S63421A
- Authority
- JP
- Japan
- Prior art keywords
- hot
- thin
- rolled
- rolling
- stainless steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 29
- 239000000463 material Substances 0.000 title claims description 24
- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims description 16
- 238000000034 method Methods 0.000 claims abstract description 45
- 238000005097 cold rolling Methods 0.000 claims abstract description 25
- 238000000137 annealing Methods 0.000 claims abstract description 21
- 238000005096 rolling process Methods 0.000 claims abstract description 17
- 238000009749 continuous casting Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000007711 solidification Methods 0.000 claims abstract description 8
- 230000008023 solidification Effects 0.000 claims abstract description 8
- 230000001360 synchronised effect Effects 0.000 claims abstract description 7
- 238000004804 winding Methods 0.000 claims description 3
- 238000005098 hot rolling Methods 0.000 abstract description 38
- 229910000831 Steel Inorganic materials 0.000 abstract description 15
- 239000010959 steel Substances 0.000 abstract description 15
- 238000000227 grinding Methods 0.000 abstract description 10
- 238000005266 casting Methods 0.000 abstract description 5
- 238000007796 conventional method Methods 0.000 abstract description 5
- 239000007858 starting material Substances 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 13
- 229910001220 stainless steel Inorganic materials 0.000 description 11
- 239000010935 stainless steel Substances 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005554 pickling Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 150000001247 metal acetylides Chemical class 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000012733 comparative method Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は鋳片と鋳型の相対速度差のないいわゆる同期式
連鋳法において、極力製品サイズに近い形で鋳造し、熱
間圧延を極力簡省略して薄鋼板を製造する方法に関する
ものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention uses the so-called synchronous continuous casting method in which there is no relative speed difference between the slab and the mold. The present invention relates to a method of manufacturing a thin steel plate in a simplified manner.
［従来の技術］
従来の連続鋳造においては鋳型をオツシレーションさせ
ながら１００ｍｍ厚以上の厚手の連続鋳造鋳片を製造し
、表面手入をおこない加熱炉で１０００℃以上に加熱し
た後、複数スタンドよりなる熱間圧延機群によって熱間
圧延し、薄鋼板の素材を製造して来た。大量生産という
観点からは大型の連鋳片を使用し、大型で高能率な熱間
圧延機群で熱間圧延する方式は一つの技術体系と考えら
れるが、高価な熱間圧延機をはじめ、加熱用の燃料や電
力等々の点でコストの点では高価な方式と言える。又強
力に熱間圧延を施す結果、それにともなう問題も生じて
おり、後述するように、熱延板焼鈍を必要としたり、又
コイル研削工程を必要とする結果になっている。[Prior art] In conventional continuous casting, thick continuous casting slabs with a thickness of 100 mm or more are produced while oscillating the mold, and after surface treatment and heating to 1000°C or more in a heating furnace, they are cast from multiple stands. This hot rolling process has been carried out using a group of hot rolling mills to produce thin steel sheet materials. From the perspective of mass production, the method of using large continuous slabs and hot rolling them with a group of large, highly efficient hot rolling mills can be considered as a technological system, but there are This method can be said to be expensive in terms of cost due to heating fuel, electricity, etc. In addition, as a result of intense hot rolling, problems arise, and as will be described later, hot rolled sheet annealing is required and a coil grinding process is required.
１８ Ｃｒ−８Ｎｉを代表として知られるオーステナイ
ト系ステンレス鋼等においても事情は全く同様である。The situation is exactly the same in austenitic stainless steels of which 18 Cr-8Ni is a representative example.
これらも厚手のＣＣ鋳片を出発材とじて熱間圧延機によ
って薄く熱延され、巻取られて熱延鋼帯とされる。これ
らの熱延鋼帯を出発材とするステンレス鋼の冷延工程に
おいては、最終製品に要求される寸法形状はもちろん、
材質と共にすぐれた表面性状が求められる。このような
要求に答えるためには、強力に熱間圧延された熱延銅帯
は硬くて次工程の冷延のためには、焼鈍軟化して冷延し
やすくする必要がある。又強力な熱間圧延により熱延時
に生じるスケール疵等は酸洗後に研削して除去する必要
がある。こうして従来技術である大型連続鋳造−強力熱
間圧延機方式において、ステンレス鋼の薄板を製造する
方法においては余りにも熱間圧延の程度が大きいため、
熱延板焼鈍工程やコイル研削工程等の本来余分な工程を
必要とすることになる。These are also hot-rolled thinly using a hot rolling mill using a thick CC slab as a starting material, and then wound to form a hot-rolled steel strip. In the cold rolling process of stainless steel using these hot-rolled steel strips as starting material, not only the dimensions and shape required for the final product, but also the
In addition to the material, excellent surface quality is required. In order to meet these demands, the hot-rolled copper strip that has been strongly hot-rolled is hard and needs to be annealed and softened to make it easier to cold-roll in the next step of cold-rolling. In addition, scale flaws and the like that occur during hot rolling due to intense hot rolling must be removed by grinding after pickling. In this way, in the conventional technology of large-scale continuous casting and high-intensity hot rolling mill method, the degree of hot rolling is too large in the method of manufacturing stainless steel thin plates.
Additional processes such as a hot-rolled plate annealing process and a coil grinding process are required.
［本発明が解決しようとする問題点］ 従来の方式とは抜本的に異なる新技術として。[Problems to be solved by the present invention] As a new technology that is fundamentally different from conventional methods.
連続鋳造の段階で極力製品サイズに近い形で鋳造するこ
とが出来れば熱間圧延工程を大幅に簡略化出来ることと
なり、鉄鋼製造工程を抜本的に変革する技術になり得る
と考えられてる。If it is possible to cast as close to the product size as possible at the continuous casting stage, the hot rolling process can be greatly simplified, and it is thought that this technology could revolutionize the steel manufacturing process.
焦点の薄仙片製造技術については各国で精力的な研究が
展開されているが、我国においても「鉄と鋼Ｊ ８５’
Ａ１９７〜８５’Ａ２５６における特集に取り上げられ
詳細に述べられている。こうして鋳片サイズによって例
えば１〜１０ｍＩ＋＋程度の厚みではＴｗｉｎ Ｒｏｌ
ｌ法が、２０〜５０ｍｍ程度の厚みではＴνｉｎ Ｂａ
１ｔ方式の同期式連続鋳造法が進歩して来た。ステンレ
ス鋼についても、これらの研究は各方面で進められてい
る。今後はこれら薄手鋳片のｒｌＪを拡大し、生産性の
向上をはかるとともに、これらの鋳片を利用して、各種
の鋼材での一貫した製造技術の開発が残された課題であ
る。Intensive research is being conducted in various countries regarding the focus on thin-sen piece manufacturing technology, but in Japan, ``Tetsu to Hagane J 85'
It is featured in special features in A197-85'A256 and is described in detail. In this way, Twin Roll
When the thickness is about 20 to 50 mm, Tνin Ba
Progress has been made in the 1-ton synchronous continuous casting method. Regarding stainless steel, these studies are also progressing in various fields. In the future, the remaining tasks are to expand the rlJ of these thin slabs and improve productivity, and to develop a consistent manufacturing technology for various steel materials using these slabs.
これら薄鋳片の製造法が進歩すればステンレス鋼薄板の
製造法に応用することで、現状の方式が抱える課題を一
挙に解決することが出来る。すなわち極力製品のサイズ
に近い薄肉ＣＣ４３片を用い。If the manufacturing method of these thin slabs advances, it will be possible to solve the problems faced by the current methods at once by applying it to the manufacturing method of stainless steel thin plates. In other words, we used a thin CC43 piece that was as close to the size of the product as possible.
熱延を極力簡略化すると共に、熱延板焼鈍を省略しかつ
コイル研削工程も省略ないし極めて軽減出来ることにな
り、ステンレス鋼薄板薄板としてはきわめて望ましいプ
ロセスとなる。そのためには実際の薄肉ＣＣを用いて、
ステンレス薄板を上記の理想的なプロセスで製造し、そ
の材質や表面特性を確認する必要があるが、広巾の薄肉
ＣＣ鋳片について、具体的な製造プロセスと材質や表面
性状に関して検討されたものは見当らない。本発明にお
いては従来法にかわって、薄肉鋳片を素材とした、表面
特性と材質にすぐれたオーステナイト系ステンレス鋼の
薄板製造法を明かにするものである。In addition to simplifying hot rolling as much as possible, hot rolling sheet annealing can be omitted and the coil grinding process can also be omitted or greatly reduced, making it an extremely desirable process for thin stainless steel sheets. To do this, we will use actual thin CC.
It is necessary to manufacture thin stainless steel plates using the ideal process described above and confirm their material and surface properties, but there have been no studies on the specific manufacturing process, materials and surface properties of wide, thin-walled CC slabs. I can't find it. In place of the conventional method, the present invention discloses a method for manufacturing thin plates of austenitic stainless steel with excellent surface properties and material quality, using thin slabs as raw materials.
［問題点を解決するための手段］
本発明は（１）１８Ｃｒ −８Ｎ ｉを代表とするオー
ステナイト系ステンレス鋼を、鋳片と鋳型の相対速度差
のない、いわゆる同期式連紡法により、凝固時の冷却速
度が３０℃／ｓ以上で鋳造された厚さ１０ｍｍ以下の薄
鋳片とし、該薄鋳片をそのまＸ８００℃以上の温度で圧
下率５０％以下で連続的に熱間圧延し、冷却して６５０
℃以下で巻取ることを特徴とする熱延コイルを用いた、
表面特性と材質のすぐれたオーステナイト系ステンレス
鋼薄板の新製造方法であり又、（２）この熱延コイルを
焼鈍を行うことなくデスケーリングし、以後は常法通り
の冷延薄板製造処理を施すことを特徴とする特許
レス鋼薄板の新製造法であり又、（３）この常法通りの
冷延薄板製造処理で、冷間圧延が、ロール径が１００＋
ｕ＋φを超える大径ロールでのタンデム冷延である、表
面特性と材質のすぐれたオーステナイト系ステンレス鋼
薄板の新製造法であり又、（４）常法通りの冷延薄板製
造処理で，冷間圧延が、ロール径が１００ｍｍφを超え
る大径ロールでタンデム冷間圧延した後ロール径が１０
０＋ｓｍφ以下の小径ロールでのリバース圧延である表
面特性と材質のすぐれたオーステナイト系ステンレス鋼
薄板の新製造法である。[Means for Solving the Problems] The present invention (1) produces austenitic stainless steel, typically 18Cr-8Ni, during solidification by a so-called synchronous continuous spinning method in which there is no relative speed difference between the slab and the mold. A thin cast piece with a thickness of 10 mm or less is cast at a cooling rate of 30 ° C / s or more, and the thin cast piece is continuously hot rolled as it is at a temperature of 800 ° C or more with a reduction rate of 50% or less, Cool to 650
Using a hot-rolled coil that is characterized by being wound at temperatures below ℃,
This is a new method for producing austenitic stainless steel thin sheets with excellent surface properties and material quality, and (2) the hot-rolled coil is descaled without annealing, and thereafter subjected to conventional cold-rolled thin sheet manufacturing processing. This is a new manufacturing method for patent-free steel thin sheets, which is characterized by:
This is a new manufacturing method for austenitic stainless steel thin sheets with excellent surface properties and material quality, which involves tandem cold rolling with large-diameter rolls exceeding u+φ. After rolling, the roll diameter is 10 mm after tandem cold rolling with large diameter rolls with a roll diameter of over 100 mmφ.
This is a new manufacturing method for austenitic stainless steel thin sheets with excellent surface properties and material quality, which involves reverse rolling with small diameter rolls of 0+smφ or less.
［作用及び実施例］
本発明者等は双ロール法により製造された薄手ＣＣ鋳片
を基本素材とし、１ ８ Ｃｒ−８ Ｎｉを代表とする
オーステナイト系ステンレス鋼薄板の製造プロセスを研
究して本発明を完成した。[Operations and Examples] The present inventors used thin CC slabs manufactured by the twin roll method as the basic material, and researched the manufacturing process of thin austenitic stainless steel sheets, typified by 1 8 Cr-8 Ni, and published this book. Completed the invention.
従来の厚手ＣＣＢ片から熱間圧延された熱延鋼帯を焼鈍
省略して冷延し最終焼鈍した１８Ｃｒ−８Ｎｉ系の薄板
では，製品の材質が板の圧延方向。In the case of 18Cr-8Ni thin sheets, which are made by hot-rolling conventional hot-rolled steel strips from thick CCB pieces, omitting annealing, and then cold-rolling and final annealing, the material of the product is in the rolling direction of the sheet.
圧延方向に直角方向及び４５゜方向等により大幅に異な
る，いわゆる異方性を示す．こうして加工性のすぐれた
オーステナイト系ステンレス薄板においては製品の異方
性は問題であった。本発明者等は従来の厚手スラブを出
発材とし、熱間圧延を行う方式において、熱延板焼鈍の
省略にともなう異方性の低減法について研究し，強力な
熱間圧延機を活用して熱延条件を規制する方式（特願昭
５６−１３０９１０）あるいは鋼成分を規制する方式（
特願昭５６−１２００６８）更には冷間圧延の方法（特
願昭５６−１２００６７）等で可能になることを明かに
して来た。今回本発明者等は１８Ｃｒ−８Ｎｉ系を代表
とするオーステナイト系ステンレス鋼の双ロール薄肉鋳
片を出発材とし、熱延を極力簡略化する方式において、
熱延板焼鈍を省略しても，製品板に異方性を生じさせな
い方法を明かにする．その際の薄肉鋳片としては例えば
内部冷却方式の銅製双ロール方により押しっけながら鋳
造した凝固温度範囲の平均冷却速度が１０’Ｃ ／ ｓ
以上で冷却された鋳片を用いて検討した。It exhibits so-called anisotropy, which differs greatly depending on the direction perpendicular to the rolling direction and at 45°. Thus, anisotropy of the product has been a problem in thin austenitic stainless steel sheets that have excellent workability. The present inventors have researched a method for reducing anisotropy due to the omission of hot-rolled plate annealing in the conventional method of hot rolling using a thick slab as a starting material, and have developed a method for reducing anisotropy by using a powerful hot rolling mill. A method of regulating hot rolling conditions (Japanese Patent Application No. 56-130910) or a method of regulating steel composition (
(Japanese Patent Application No. 56-120068) Furthermore, it has been revealed that this can be achieved by a method such as cold rolling (Japanese Patent Application No. 56-120067). This time, the present inventors used a twin-roll thin slab of austenitic stainless steel, typically 18Cr-8Ni, as a starting material, and in a method to simplify hot rolling as much as possible,
We will reveal a method that does not cause anisotropy in the product sheet even if hot-rolled sheet annealing is omitted. In this case, the thin-walled slab is, for example, cast using an internally cooled twin copper roll while being pushed, and has an average cooling rate of 10'C/s in the solidification temperature range.
A study was conducted using the slab cooled above.
鋳片は鋳造後鋳造機出口に設置した熱間圧延機にかみ込
み，熱間圧延をされて後冷却し、巻取られた。熱間圧延
は１ないし２パスで０％がら７ｏ％程度まで圧下を加え
た．圧下温度は１１００’Ｃ〜８００’Ｃ程度であった
。その後熱延コイルは焼鈍を行うことなく酸洗し、冷延
し、最終焼鈍して薄板の材質を調査した。熱延板焼鈍を
省略しても、異方性の顕著でない条件としては、鋳片厚
みが１０１ＩｌｌＩ未満で，熱延の圧下率が５０％以下
であった。After casting, the slab was placed in a hot rolling machine installed at the outlet of the casting machine, where it was hot rolled, cooled, and then wound. During hot rolling, reduction was applied from 0% to approximately 70% in one or two passes. The rolling temperature was about 1100'C to 800'C. Thereafter, the hot-rolled coil was pickled without annealing, cold-rolled, and finally annealed, and the material of the thin plate was investigated. The conditions under which anisotropy was not significant even if hot-rolled plate annealing was omitted were that the slab thickness was less than 101IllI and the hot-rolling reduction ratio was 50% or less.
鋳片厚みが厚くなり熱延圧下率が大きくなると異方性が
劣化した。こうして双ロール法等で１０ｍｌ１未満の鋳
片で冷速か３０℃／ｓ以上を直接５０％以下の圧下率で
熱延する場合には，熱延板焼鈍を省略しても異方性は顕
著ではない。他の特性に関しても特に熱間圧延が必須と
なるものはなく、オーステナイト系ステンレス鋼薄板の
材質の点からは熱延圧下率の下限を規定するものでない
。しかし双ロール法等で１〜１０ｍｍＥ［９片で巾を広
げると巾方向の凝固現象の変動にともなって巾方向に板
厚が変動するため，熱間圧延を全く省略して冷延用素材
とすることは得策でない．こうして寸法矯正の効果も狙
い、鋳片に５０％以下の圧下率で熱間での圧下を加える
ことが有効である。ステンレス鋼薄板製品において、表
面品質のウェイトは極めて大きい。本来の特性である耐
食性，耐銹性はもちろん、外観としての光沢、美麗さ、
更には研磨性等々である．これらはステンレス表面のミ
クロ的な欠陥に起因していることが知られているが，本
発明者等の研究では現行製造法において、特に熱延鋼帯
の表面に存在する凹凸に原因するものの寄与が大きいこ
とが判明した。すなわち現行の厚手のＣＣ鋳片は加熱炉
において１０００’Ｃ以上の高温で長時間加熱された後
熱間圧延されるが、この加熱炉で生成する表面のスケー
ルが局部的に不均一で，熱間圧延時に鋼板表面におしこ
まれて。As the slab thickness increased and the hot rolling reduction ratio increased, the anisotropy deteriorated. In this way, when a slab of less than 10ml1 is hot-rolled cold or directly at a rolling rate of 30°C/s or more with a reduction rate of 50% or less using the twin-roll method, anisotropy is noticeable even if hot-rolled sheet annealing is omitted. isn't it. There are no other properties that particularly require hot rolling, and there is no lower limit to the hot rolling reduction rate from the viewpoint of the material of the austenitic stainless steel thin plate. However, when the width is increased by 1 to 10 mmE [9 pieces] using the twin roll method, the thickness changes in the width direction due to changes in the solidification phenomenon in the width direction, so hot rolling is completely omitted and the material for cold rolling is used. It is not a good idea to do so. In this way, aiming at the effect of dimensional correction, it is effective to apply hot reduction to the slab at a reduction rate of 50% or less. Surface quality plays an extremely important role in stainless steel sheet products. In addition to the inherent characteristics of corrosion resistance and rust resistance, the appearance is glossy, beautiful,
Furthermore, it has abrasiveness, etc. It is known that these defects are caused by microscopic defects on the surface of stainless steel, but the present inventors' research revealed that in the current manufacturing method, the contribution of irregularities on the surface of hot-rolled steel strips. turned out to be large. In other words, current thick CC slabs are heated in a heating furnace at a high temperature of 1000'C or more for a long time and then hot rolled. It is pushed into the surface of the steel plate during rolling.
コイル表面に局部的な凹凸を生じさせる。この凹凸は冷
延前で深さが最大２０μ程度あり、従来はコイル研削工
程で表面を研削することで除去してきた。本発明者等は
これらステンレス鋼熱延鋼帯の表面に存在する凹凸につ
いて研究を進めてきたが、双ロール鋳片等の薄肉鋳片で
、加熱されることなく５０％以下の圧下率で熱間圧延さ
れたコイルにおいては、これらの凹凸が全く見られない
ことを見出した。特に双ロールで押しつけられた鋳片表
面をその後加熱することなく、５０％以下の熱間圧延を
施し、熱延板焼鈍を省略したものの表面の凹凸の深さを
現行の冷延素材と比較した。現行材は５ＵＳ３０４の厚
さ１５０ｍｍＣＣ鋳片を１２００℃以上で２時間加熱さ
れ、熱間圧延で３ｍｍとし、焼鈍・酸洗したものでコイ
ル表面の凹凸の深さを光学顕微鏡でａＩす定し、１００
点の平均を求めた結果、１８μであった。これに対して
双ロール法からのものは６μで実に１／３の深さであっ
た・
この程度の凹凸では冷延工程で冷延圧下率を取ることで
修復することが出来る。特に小径ロールによるゼンジミ
ャー法はもちろん、大径ロールのタンデム冷延法にても
、すぐれた表面光沢となる。Creates local unevenness on the coil surface. These irregularities have a maximum depth of about 20 μm before cold rolling, and have conventionally been removed by grinding the surface in a coil grinding process. The present inventors have been conducting research on the unevenness existing on the surface of these hot-rolled stainless steel strips. It has been found that these irregularities are not observed at all in the inter-rolled coil. In particular, the depth of surface irregularities was compared with that of the current cold-rolled material when the surface of the cast slab pressed by twin rolls was hot-rolled to 50% or less without subsequent heating, and hot-rolled plate annealing was omitted. . The current material is a 5US304 CC slab with a thickness of 150 mm heated at 1200°C or higher for 2 hours, hot rolled to 3 mm, annealed and pickled, and the depth of the irregularities on the coil surface was determined using an optical microscope. 100
The average of the points was found to be 18μ. On the other hand, the one from the twin roll method had a depth of 6μ, which was actually 1/3 of the depth. This level of unevenness can be repaired by adjusting the cold rolling reduction in the cold rolling process. In particular, excellent surface gloss can be obtained not only by the Sendzimir method using small diameter rolls, but also by the tandem cold rolling method using large diameter rolls.
こうして双ロール法で製造した５ＵＳ３０４を主とする
ステンレス鋼の薄鋳片を加熱することなく５０％以下の
圧下率で１パス熱間圧延し、冷却し６５０’Ｃ以下とし
て巻取り、酸洗デスケール後冷間圧延し、常法通り最終
焼鈍・酸洗して２Ｂ製品としたもの及び光輝焼鈍したＢ
Ａ製品においては。The thin cast slab of stainless steel mainly made of 5US304 produced by the twin roll method is hot-rolled in one pass at a rolling reduction of 50% or less without heating, cooled, rolled up at 650'C or less, and pickled and descaled. After cold rolling, final annealing and pickling in the usual manner to produce 2B products, and bright annealed B
Regarding product A.
完備抵抗が大きく、光沢が良好で、かつ研磨性が良好で
あった。６５０’Ｃ以上で巻取ると巻取中に炭化物が粒
界に析出し、酸洗時に粒界腐食を生じ、冷延製品の表面
光沢を劣化させる。The complete resistance was large, the gloss was good, and the polishability was good. If coiling is performed at a temperature of 650'C or higher, carbides will precipitate at grain boundaries during coiling, causing intergranular corrosion during pickling and degrading the surface gloss of the cold-rolled product.
凝固時の冷却速度が３０℃／ｓ未満の鋳片では熱延板焼
鈍省略により異方性が大きくなる。又厚さが１０ｍｍ１
超の鋳片では凝固時の冷却速度が３０’Ｃ／ ｓ未満と
なり、熱延板焼鈍省略により異方性が大きくなると共に
、冷延用素材まで熱延するには熱延ミルが巨大あるいは
２スタンド以上となり不経済である。In slabs whose cooling rate during solidification is less than 30°C/s, anisotropy increases due to omission of hot-rolled plate annealing. Also, the thickness is 10mm1
The cooling rate during solidification is less than 30'C/s for super cast slabs, and the anisotropy increases due to the omission of hot-rolled plate annealing. It becomes more than a stand and is uneconomical.
薄鋳片の熱間圧延は鋳造機出側に設置された熱間圧延機
にて直接かつ連続的に行われるが、熱間圧延の圧下率は
５０％以下が望ましい。５０％を超えても特に材質上の
利点はなく、製品の異方性を大きくし、かつ熱間圧延機
を大きくするだけである。熱延の作用としては材質以外
には鋳造時の内部欠陥の圧着をはじめとし鋳片の巾方向
、長手方向の寸法、形状やミクロ的な凹凸の改善効果が
あり、矯正の意味で若干の圧下を加えることが有効であ
る。Hot rolling of the thin slab is carried out directly and continuously in a hot rolling mill installed on the exit side of the casting machine, and the reduction ratio of the hot rolling is preferably 50% or less. If it exceeds 50%, there is no particular advantage in terms of material quality, and it only increases the anisotropy of the product and increases the size of the hot rolling mill. In addition to the material properties, hot rolling has the effect of crimping internal defects during casting, improving the width and longitudinal dimensions, shape, and microscopic irregularities of the slab, and slightly reducing rolling for correction purposes. It is effective to add
熱延の温度は８００℃以上が望ましい。８００℃未満に
なると熱延ロールの負荷の点や更に炭化物の析出を加速
するためである。巻取りは６５０℃以下とする必要があ
り、６５０℃を超えて巻取ると復熱により炭化物が析出
し、その後の酸洗工程で粒界腐食を発生させるためであ
る。The hot rolling temperature is preferably 800°C or higher. This is because if the temperature is lower than 800°C, the load on the hot rolling rolls will be increased and the precipitation of carbides will be accelerated. The winding temperature must be 650° C. or lower, because if the winding temperature exceeds 650° C., carbides will precipitate due to reheating, causing intergranular corrosion in the subsequent pickling process.
以上のようにして、薄鋳片を加熱することなく熱間圧延
し、６５０℃以下で捲取り、デスケールした熱延コイル
には局部スケールに起因する表面凹凸がなく、表面粗さ
の小さい熱延コイルとすることが出来る。As described above, the hot-rolled coil is hot-rolled without heating the thin slab, wound at 650°C or below, and descaled.The hot-rolled coil has no surface irregularities caused by local scale, and has a small surface roughness. It can be made into a coil.
次に本発明の実施例について述べる。Next, examples of the present invention will be described.
第１表は本発明の実施例として、実施した鋼成分を示し
ている。第２表はそれぞれの鋼種の鋳片製造条件及び熱
延条件、巻取条件を示し、第３表はそれら薄板の特性を
示している。今回は比較法として示した現状の厚手ＣＣ
鋳片から、１２００℃以上で加熱し、１１バスの圧延で
９５％以上の熱間圧延率を与えたコイルにおいても熱延
板焼鈍を省略し、かつコイル研削工程も省略した方法で
、薄手ＣＣから省工程で製造したものと比較した。Table 1 shows the steel components used as examples of the present invention. Table 2 shows the slab manufacturing conditions, hot rolling conditions, and coiling conditions for each steel type, and Table 3 shows the properties of these thin sheets. This time, the current thick CC shown as a comparative method
Thin CC is produced from a slab by heating it to 1200℃ or higher and giving a hot rolling rate of 95% or higher in 11 baths by omitting hot-rolled plate annealing and also omitting the coil grinding process. The comparison was made with a product manufactured using a reduced process.
第３表から明かな通り、薄ＣＣから出発し長時間加熱を
省略し、５０％以下の熱間圧延で熱延し、６５０℃以下
で巻取り、熱延板焼鈍を省略し、コイル研削工程を簡省
略し、冷延工程も従来のゼンジミャミルのような小径リ
バース法はもちろん、普通鋼冷延に使用される大径ロー
ルによるタンデム冷延法によっても、又更にタンデム冷
延のあと小径ロールによるリバース法を組合せることに
よっても、すぐれた表面特性を得ることが出来る。As is clear from Table 3, starting from thin CC, omitting long-time heating, hot rolling with less than 50% hot rolling, coiling at less than 650°C, omitting hot-rolled plate annealing, and coil grinding process. The cold rolling process can be performed not only by the conventional small-diameter reverse method such as Sendzimya Mill, but also by the tandem cold-rolling method using large-diameter rolls used for ordinary steel cold-rolling, or by using small-diameter rolls after tandem cold rolling. Excellent surface properties can also be obtained by combining the reverse method.
この理由としては第４表に示した通り、冷延前における
素材表面の凹凸が本発明法では従来法に比較して大幅に
すぐれているためである。The reason for this is that, as shown in Table 4, the unevenness of the surface of the material before cold rolling is significantly better in the method of the present invention than in the conventional method.
［本発明の効果］
本発明によれば、製品形状に極力近い形の鋳片を利用し
て、熱延工程を簡略化できると共に、熱延板焼鈍工程を
省略し、かつコイルの研削工程を簡略化できる上に、材
質上及び表面特性上もすぐれた冷延製品を得ることが出
来、オーステナイト系ステンレス鋼の製造法としては画
期的なもので。[Effects of the present invention] According to the present invention, the hot rolling process can be simplified by using a slab with a shape as close as possible to the product shape, and the hot rolled sheet annealing process can be omitted, and the coil grinding process can be omitted. This is a revolutionary method for producing austenitic stainless steel, as it is not only simple but also allows the production of cold-rolled products with excellent material and surface properties.
その工業的効果は極めて大きい。Its industrial effects are extremely large.
Claims (1)
ステンレス鋼を、鋳片と鋳型の相対速度差のないいわゆ
る同期式連鋳法により、凝固時の冷却速度が３０℃／ｓ
以上で鋳造された厚さ１０ｍｍ以下の薄鋳片とし、該薄
鋳片をそのまゝ８００℃以上の温度で圧下率５０％以下
で連続的に熱間圧延し、冷却して６５０℃以下で巻取る
ことを特徴とする熱延コイルを用いた、表面特性と材質
のすぐれたオーステナイト系ステンレス鋼薄板の新製造
法（２）オーステナイト系ステンレス鋼を、鋳片と鋳型
の相対速度差のない、いわゆる同期式連鋳法により、凝
固時の冷却速度が３０℃／ｓ以上で鋳造された厚さ１０
ｍｍ以下の薄鋳片とし、該薄鋳片をそのまゝ８００℃以
上の温度で圧下率５０％以下で連続的に熱間圧延し、冷
却して６５０℃以下で巻取り熱延コイルとし、該熱延コ
イルを焼鈍を行うことなくデスケーリングし、以後は常
法通りの冷延薄板製造処理を施すことを特徴とする表面
特性と材質のすぐれたオーステナイト系ステンレス鋼薄
板の新製造法 （３）常法通りの冷延薄板製造処理で、冷間圧延が、ロ
ール径が１００ｍｍφを超える大径ロールでのタンデム
冷延である、特許請求の範囲第２項に記載の、表面特性
と材質のすぐれたオーステナイト系ステンレス鋼薄板の
新製造法 （４）常法通りの冷延薄板製造処理で、冷間圧延が、ロ
ール径が１００ｍｍφを超える大径ロールでタンデム冷
間圧延した後ロール径が１００ｍｍφ以下の小径ロール
でのリバース圧延である、特許請求の範囲第２項に記載
の、表面特性と材質のすぐれたオーステナイト系ステン
レス鋼薄板の新製造法[Claims] (1) Austenitic stainless steel, typically 18Cr-8Ni, is produced by a so-called synchronous continuous casting method in which there is no relative speed difference between the slab and the mold, so that the cooling rate during solidification is 30°C/s.
The above-cast thin slab with a thickness of 10 mm or less is then continuously hot rolled at a temperature of 800°C or higher with a reduction rate of 50% or less, cooled, and then rolled at a temperature of 650°C or lower. A new manufacturing method for thin austenitic stainless steel sheets with excellent surface properties and material quality using a hot-rolled coil characterized by winding. Cast with a thickness of 10°C using the so-called synchronous continuous casting method at a cooling rate of 30°C/s or more during solidification.
mm or less, the thin slab is continuously hot-rolled as it is at a temperature of 800°C or higher with a rolling reduction of 50% or less, cooled and wound at 650°C or lower to form a hot-rolled coil, A new manufacturing method for austenitic stainless steel thin sheets with excellent surface properties and material quality, characterized by descaling the hot-rolled coil without annealing, and then subjecting it to a conventional cold-rolled thin sheet manufacturing process (3). ) In a conventional cold-rolled sheet manufacturing process, the cold rolling is tandem cold rolling with a large-diameter roll having a roll diameter exceeding 100 mmφ. A new manufacturing method for excellent austenitic stainless steel thin sheets (4) In the conventional cold rolling thin sheet manufacturing process, cold rolling is performed by tandem cold rolling with large diameter rolls with a roll diameter of over 100 mmφ, and then the roll diameter is 100 mmφ. A new method for manufacturing an austenitic stainless steel thin plate with excellent surface properties and material quality, as set forth in claim 2, which is reverse rolling using the following small diameter rolls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61141433A JPH0730404B2 (en) | 1986-06-19 | 1986-06-19 | New production method of austenitic stainless steel sheet with excellent surface characteristics and materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61141433A JPH0730404B2 (en) | 1986-06-19 | 1986-06-19 | New production method of austenitic stainless steel sheet with excellent surface characteristics and materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63421A true JPS63421A (en) | 1988-01-05 |
| JPH0730404B2 JPH0730404B2 (en) | 1995-04-05 |
Family
ID=15291854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61141433A Expired - Lifetime JPH0730404B2 (en) | 1986-06-19 | 1986-06-19 | New production method of austenitic stainless steel sheet with excellent surface characteristics and materials |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0730404B2 (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990000454A1 (en) * | 1988-07-08 | 1990-01-25 | Nippon Steel Corporation | PROCESS FOR PRODUCING THIN Cr-Ni STAINLESS STEEL SHEET EXCELLENT IN BOTH SURFACE QUALITY AND QUALITY OF MATERIAL |
| JPH02133528A (en) * | 1988-07-08 | 1990-05-22 | Nippon Steel Corp | Production of cr-ni stainless steel sheet having excellent surface quality and material quality |
| JPH02133529A (en) * | 1988-07-08 | 1990-05-22 | Nippon Steel Corp | Production of cr-ni stainless steel sheet having excellent surface quality and material quality |
| EP0387785A2 (en) * | 1989-03-14 | 1990-09-19 | Nippon Steel Corporation | Process for producing cold-rolled strips and sheets of austenitic stainless steel |
| JPH02240219A (en) * | 1989-03-14 | 1990-09-25 | Nippon Steel Corp | Production of austenitic stainless steel sheet |
| JPH02267225A (en) * | 1989-04-05 | 1990-11-01 | Nippon Steel Corp | Production of cr-ni stainless steel sheet excellent in surface quality |
| JPH03107427A (en) * | 1989-09-22 | 1991-05-07 | Nippon Steel Corp | Production of cr-ni stainless steel sheet excellent in mechanical property and surface characteristic |
| WO1991009144A1 (en) * | 1989-12-20 | 1991-06-27 | Nippon Steel Corporation | Process for producing thin austenitic stainless steel plate and equipment therefor |
| US5030296A (en) * | 1988-07-08 | 1991-07-09 | Nippon Steel Corporation | Process for production of Cr-Ni type stainless steel sheet having excellent surface properties and material quality |
| JPH03211236A (en) * | 1990-01-17 | 1991-09-17 | Nippon Steel Corp | Production of cr-ni stainless steel sheet excellent in surface quality and material quality |
| WO1997026378A1 (en) * | 1996-01-17 | 1997-07-24 | Nippon Steel Corporation | HOT ROLLED Cr-Ni STAINLESS STEEL PLATE OF LOW ANISOTROPY AND PROCESS FOR PRODUCING THE SAME |
| US6099665A (en) * | 1995-04-14 | 2000-08-08 | Nippon Steel Corporation | Method for producing Cr-Ni type stainless steel thin sheet having excellent surface quality |
| KR100498069B1 (en) * | 2000-12-21 | 2005-07-01 | 주식회사 포스코 | Method for producing high strength stainless steel in strip casting & in-line rolling apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60224715A (en) * | 1984-04-23 | 1985-11-09 | Nippon Steel Corp | Manufacture of hot rolled thin steel strip |
| JPS60262921A (en) * | 1984-06-08 | 1985-12-26 | Nippon Steel Corp | Manufacture of sheet or strip of austenitic stainless steel |
-
1986
- 1986-06-19 JP JP61141433A patent/JPH0730404B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60224715A (en) * | 1984-04-23 | 1985-11-09 | Nippon Steel Corp | Manufacture of hot rolled thin steel strip |
| JPS60262921A (en) * | 1984-06-08 | 1985-12-26 | Nippon Steel Corp | Manufacture of sheet or strip of austenitic stainless steel |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990000454A1 (en) * | 1988-07-08 | 1990-01-25 | Nippon Steel Corporation | PROCESS FOR PRODUCING THIN Cr-Ni STAINLESS STEEL SHEET EXCELLENT IN BOTH SURFACE QUALITY AND QUALITY OF MATERIAL |
| JPH02133528A (en) * | 1988-07-08 | 1990-05-22 | Nippon Steel Corp | Production of cr-ni stainless steel sheet having excellent surface quality and material quality |
| JPH02133529A (en) * | 1988-07-08 | 1990-05-22 | Nippon Steel Corp | Production of cr-ni stainless steel sheet having excellent surface quality and material quality |
| US5030296A (en) * | 1988-07-08 | 1991-07-09 | Nippon Steel Corporation | Process for production of Cr-Ni type stainless steel sheet having excellent surface properties and material quality |
| JPH02240219A (en) * | 1989-03-14 | 1990-09-25 | Nippon Steel Corp | Production of austenitic stainless steel sheet |
| JPH0742513B2 (en) * | 1989-03-14 | 1995-05-10 | 新日本製鐵株式会社 | Method for producing austenitic stainless steel sheet |
| EP0387785A2 (en) * | 1989-03-14 | 1990-09-19 | Nippon Steel Corporation | Process for producing cold-rolled strips and sheets of austenitic stainless steel |
| JPH02267225A (en) * | 1989-04-05 | 1990-11-01 | Nippon Steel Corp | Production of cr-ni stainless steel sheet excellent in surface quality |
| JPH0796684B2 (en) * | 1989-04-05 | 1995-10-18 | 新日本製鐵株式会社 | Method for producing Cr-Ni type stainless steel thin plate with excellent surface quality |
| JPH03107427A (en) * | 1989-09-22 | 1991-05-07 | Nippon Steel Corp | Production of cr-ni stainless steel sheet excellent in mechanical property and surface characteristic |
| WO1991009144A1 (en) * | 1989-12-20 | 1991-06-27 | Nippon Steel Corporation | Process for producing thin austenitic stainless steel plate and equipment therefor |
| US5284535A (en) * | 1989-12-20 | 1994-02-08 | Nippon Steel Corporation | Method of manufacturing an austenitic stainless steel sheet and a manufacturing system for carrying out the same |
| JPH03211236A (en) * | 1990-01-17 | 1991-09-17 | Nippon Steel Corp | Production of cr-ni stainless steel sheet excellent in surface quality and material quality |
| JPH0794691B2 (en) * | 1990-01-17 | 1995-10-11 | 新日本製鐵株式会社 | Method for producing Cr-Ni series stainless steel thin plate with excellent surface quality and material |
| US6099665A (en) * | 1995-04-14 | 2000-08-08 | Nippon Steel Corporation | Method for producing Cr-Ni type stainless steel thin sheet having excellent surface quality |
| WO1997026378A1 (en) * | 1996-01-17 | 1997-07-24 | Nippon Steel Corporation | HOT ROLLED Cr-Ni STAINLESS STEEL PLATE OF LOW ANISOTROPY AND PROCESS FOR PRODUCING THE SAME |
| US6090229A (en) * | 1996-01-17 | 2000-07-18 | Nippon Steel Corporation | Low anisotropic Cr-Ni-based hot rolled stainless steel sheet and process for its production |
| KR100498069B1 (en) * | 2000-12-21 | 2005-07-01 | 주식회사 포스코 | Method for producing high strength stainless steel in strip casting & in-line rolling apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0730404B2 (en) | 1995-04-05 |
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