JPH05293506A - Manufacture of austenitic stainless sheet - Google Patents
Manufacture of austenitic stainless sheetInfo
- Publication number
- JPH05293506A JPH05293506A JP9676092A JP9676092A JPH05293506A JP H05293506 A JPH05293506 A JP H05293506A JP 9676092 A JP9676092 A JP 9676092A JP 9676092 A JP9676092 A JP 9676092A JP H05293506 A JPH05293506 A JP H05293506A
- Authority
- JP
- Japan
- Prior art keywords
- edge
- continuous casting
- slab
- cold rolling
- cast billet
- 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
Landscapes
- Continuous Casting (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Metal Rolling (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鋳片と鋳型壁面の間に
相対速度差のない、いわゆる同期式連続鋳造プロセスに
よって鋳造した製品厚さに近い厚さの鋳片を冷間圧延し
て、オーステナイト系ステンレス鋼薄板を製造する方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention cold-rolls a slab having a thickness close to that of a product cast by a so-called synchronous continuous casting process in which there is no relative speed difference between the slab and the mold wall surface. , A method for producing an austenitic stainless steel sheet.
【０００２】[0002]
【従来の技術】同期式連続鋳造プロセスとは、たとえば
「鉄と鋼」'85-A197〜A256に特集された論文に紹介され
ているような、双ロール法、双ベルト法、単ロール法
等、鋳片と鋳型壁面間に相対速度差のない同期式連続鋳
造プロセスである。これら同期式連続鋳造プロセスの一
つである双ロール式連続鋳造法は、平行又は傾斜配置し
た一対の同径あるいは異径冷却ロールとその両端面をシ
ールするサイド堰とによって構成した連続鋳造鋳型内に
金属溶湯を注入し、両冷却ロールの円周面状にそれぞれ
凝固殻を生成させ、回転する両冷却ロールの最近接位置
（いわゆる「キッシングポイント」）付近で凝固殻同士
を合体させて一体の薄帯状鋳片として送出する連続鋳造
方法である。2. Description of the Related Art Synchronous continuous casting processes are, for example, twin roll method, twin belt method, single roll method, etc. as introduced in a paper specializing in "Iron and Steel"'85 -A197 to A256. It is a synchronous continuous casting process with no relative speed difference between the slab and the mold wall. The twin-roll continuous casting method, which is one of these synchronous continuous casting processes, uses a continuous casting mold composed of a pair of parallel or inclined cooling rolls of the same diameter or different diameters and side dams that seal the end faces of the cooling rolls. The molten metal is poured into each of the two cooling rolls to form solidified shells on the circumferential surfaces of the two cooling rolls, and the solidified shells are united near the closest position (so-called “kissing point”) of the rotating cooling rolls. It is a continuous casting method in which it is delivered as a thin strip.
【０００３】例えば、双ロール式連続鋳造法により鋳造
される薄帯状鋳片は、厚さ数ｍｍ（通常１〜１０ｍｍ程
度）であり、熱間圧延を経ずに冷間圧延を行って薄板製
品を製造することができる。そのため、振動鋳型等を用
いる連続鋳造により厚さ１００ｍｍ超の熱間圧延用スラ
ブとしての鋳片を鋳造し、これを熱間圧延してから冷間
圧延する製造方法（スラブ鋳片／熱間圧延プロセス）に
比べて、生産効率およびコストが格段に有利になる。For example, a thin strip slab cast by a twin roll type continuous casting method has a thickness of several mm (usually about 1 to 10 mm), and is cold rolled without hot rolling to be a thin plate product. Can be manufactured. Therefore, a manufacturing method of casting a slab as a slab for hot rolling having a thickness of more than 100 mm by continuous casting using a vibration mold, hot rolling the slab, and then cold rolling (slab slab / hot rolling The production efficiency and cost are significantly improved compared to the (process).
【０００４】冷間圧延されたオーステナイト系ステンレ
ス鋼薄板は、種々の冷間成形加工を施されて産業用およ
び家庭用の耐食性構造材および外装材として広く用いら
れている付加価値の高い製品であり、その製造に双ロー
ル式連続鋳造法等を適用することにより高い経済効果が
得られることが期待される。しかし、双ロール式連続鋳
造法等により鋳造した薄帯状鋳片を熱間圧延を経ずに冷
間圧延する際には、次の問題があった。The cold-rolled austenitic stainless steel sheet is a high-value-added product that has been subjected to various cold forming processes and is widely used as an industrial and domestic corrosion-resistant structural material and exterior material. It is expected that high economic effects will be obtained by applying the twin roll type continuous casting method or the like to the production. However, when cold-rolling a thin strip slab cast by a twin roll type continuous casting method or the like without hot rolling, the following problems occur.
【０００５】すなわち、スラブ鋳片／熱間圧延プロセス
で得られる熱延ホットコイルは、エッジ形状が比較的良
好で、エッジトリムを行わずに冷間圧延することができ
る。これに対して、双ロール式連続鋳造等で得られる薄
帯状鋳片をホットコイルとして用いる場合、エッジ部の
凝固遅れ等に起因した鋳ばりが発生しており、場合によ
ってはエッジ欠損に至ることもある。そのため冷間圧延
前に上記の欠陥を除去するためのエッジトリム処理（側
縁部切断除去）を行う必要がある。That is, the hot rolled hot coil obtained by the slab slab / hot rolling process has a relatively good edge shape and can be cold rolled without edge trimming. On the other hand, when a thin strip-shaped slab obtained by twin roll type continuous casting or the like is used as a hot coil, flash occurs due to delay in solidification of the edge portion, etc. There is also. Therefore, it is necessary to perform edge trim processing (side edge cutting removal) for removing the above defects before cold rolling.
【０００６】しかし、オーステナイト系ステンレス鋼、
特にＳＵＳ３０４に代表される１８−８系オーステナイ
トステンレス鋼は、冷間加工によってマルテンサイト変
態が生じるため、エッジトリムによって両エッジが硬化
する。これをそのまま冷間圧延すると、圧延中に耳割れ
が発生し、板破断の原因になる。However, austenitic stainless steel,
Particularly, in 18-8 austenitic stainless steel represented by SUS304, martensite transformation occurs due to cold working, so that both edges are hardened by edge trim. If this is cold-rolled as it is, edge cracking occurs during rolling, which causes plate breakage.
【０００７】[0007]
【発明が解決しようとする課題】本発明は、鋳片と鋳型
壁面との間に相対速度差のない、いわゆる同期式連続鋳
造法によってオーステナイト系ステンレス鋼薄板を製造
するに際し、エッジトリム処理による鋳片エッジ部の硬
化を防止することにより、冷間圧延前の焼鈍をしなくと
も、耳割れや板破断等のトラブルを生ぜずに安定して冷
間圧延を行えるようにする方法を提供することを目的と
する。DISCLOSURE OF THE INVENTION The present invention, when producing an austenitic stainless steel thin plate by a so-called synchronous continuous casting method in which there is no relative speed difference between a slab and a mold wall surface, casting by edge trim treatment is used. By preventing hardening of one edge portion, it is possible to provide a method that enables stable cold rolling without causing troubles such as edge cracking and plate breaking without annealing before cold rolling. With the goal.
【０００８】[0008]
【課題を解決するための手段】本発明は、鋳片と鋳型壁
面が同期して移動する連続鋳造法により薄帯状鋳片を鋳
造し、この鋳片をエッジトリムしてから冷間圧延する際
に、下記 1 式で定義されるMd30の値＋５０℃以上の温
度で上記エッジトリムを行うことを特徴とするオーステ
ナイト系ステンレス鋼薄板の製造方法である。Md30 = 4
13-462(%C+%N)-9.2%Si-8.1%Mn-13.7%Cr-18.5%Mo-9.5(%N
i+%Cu)... 1 式According to the present invention, when a strip-shaped slab is cast by a continuous casting method in which the slab and the mold wall surface move in synchronization, the strip is edge-trimmed and then cold-rolled. In addition, a method for producing an austenitic stainless steel thin plate is characterized in that the above edge trim is performed at a temperature of Md30 value defined by the following formula 1 + 50 ° C. or more. Md30 = 4
13-462 (% C +% N) -9.2% Si-8.1% Mn-13.7% Cr-18.5% Mo-9.5 (% N
i +% Cu) ... 1 expression
【０００９】[0009]
【作用】エッジトリム後に焼鈍を行うと冷間圧延中の耳
割れ発生は無いことから、冷間圧延中の耳割れ発生の原
因は、エッジトリム処理における切断面近傍に発生した
硬いマルテンサイト相と元々の軟らかいオーステナイト
相とが混在した状態で冷間圧延を受けることであると考
えられる。[Operation] Since edge cracking does not occur during cold rolling when annealing is performed after edge trimming, the cause of edge cracking during cold rolling is that the hard martensite phase near the cut surface in the edge trim treatment is the cause. It is considered that cold rolling is performed in the state where the original soft austenite phase is mixed.
【００１０】本発明者は、エッジトリム処理でマルテン
サイト変態が生じないようにするには、鋳片のMd30の値
＋５０℃以上の温度でエッジトリム処理を行えばよいこ
とを見出した。以下に、実施例によって本発明を更に詳
細に説明する。The present inventor has found that, in order to prevent the martensitic transformation from occurring in the edge trim treatment, the edge trim treatment may be performed at a temperature of the value of Md30 of the slab + 50 ° C. or more. Hereinafter, the present invention will be described in more detail with reference to Examples.
【００１１】[0011]
【実施例】双ロール式連続鋳造法により、表１に示す４
水準のMd30の値を有するＳＵＳ３０４薄帯状鋳片を鋳造
し、デスケールした後、２０〜１００℃の温度でシャー
切断によりエッジトリム処理した材料を焼鈍をせずに、
１パス（圧下率１０％）の冷間圧延を施した。冷間圧延
後の材料について耳割れの有無を目視判定した結果を表
２に示す。[Examples] 4 shown in Table 1 by twin roll continuous casting method
A SUS304 thin strip slab having a level Md30 value was cast, descaled, and then edge-trimmed by shear cutting at a temperature of 20 to 100 ° C. without annealing.
Cold rolling was performed in one pass (reduction rate 10%). Table 2 shows the results of visual determination of the presence or absence of edge cracks in the material after cold rolling.
【００１２】[0012]
【表１】 [Table 1]
【００１３】[0013]
【表２】 [Table 2]
【００１４】表１の４水準のMd30の値の材料（Ａ，Ｂ，
Ｃ，Ｄ）は、それぞれそのMd30の値＋５０℃以上の温度
でエッジトリムを行った場合には、耳割れを発生せずに
安定して冷間圧延することができた。Materials having Md30 values of four levels in Table 1 (A, B,
C and D) could be stably cold-rolled without edge cracking when edge trimming was performed at a temperature of Md30 + 50 ° C. or higher.
【００１５】[0015]
【発明の効果】以上説明したように、本発明によれば、
エッジトリム処理による鋳片エッジ部の硬化を防止する
ことにより、冷間圧延前の焼鈍をしなくとも、耳割れや
板破断等のトラブルを生ぜずに安定して冷間圧延を行
い、オーステナイト系ステンレス鋼薄板を製造すること
ができる。As described above, according to the present invention,
By preventing hardening of the slab edge by edge trim treatment, stable cold rolling can be performed without causing troubles such as edge cracking and plate breaking without annealing before cold rolling. Stainless steel sheets can be manufactured.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 井上 周一 山口県光市大字島田3434番地 新日本製鐵 株式会社光製鐵所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuichi Inoue 3434 Shimada, Hikari City, Yamaguchi Prefecture Shin Nippon Steel Co., Ltd.
Claims (1)
鋳造法により薄帯状鋳片を鋳造し、該鋳片をエッジトリ
ムしてから冷間圧延する際に、 1 式で定義されるMd30
の値＋５０℃以上の温度で前記エッジトリムを行うこと
を特徴とするオーステナイト系ステンレス鋼薄板の製造
方法。 Md30 = 413-462(%C+%N)-9.2%Si-8.1%Mn-13.7%Cr-18.5%Mo-9.5(%Ni+%Cu)... 11. When a thin strip-shaped slab is cast by a continuous casting method in which the wall surface of the mold and the slab move in synchronism, and the slab is edge-trimmed and then cold-rolled, it is defined by 1 Md30
Value of + 50 ° C. or more, the edge trimming is performed at a temperature of 50 ° C. or more. Md30 = 413-462 (% C +% N) -9.2% Si-8.1% Mn-13.7% Cr-18.5% Mo-9.5 (% Ni +% Cu) ... 1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4096760A JP2977366B2 (en) | 1992-04-16 | 1992-04-16 | Manufacturing method of austenitic stainless steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4096760A JP2977366B2 (en) | 1992-04-16 | 1992-04-16 | Manufacturing method of austenitic stainless steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05293506A true JPH05293506A (en) | 1993-11-09 |
| JP2977366B2 JP2977366B2 (en) | 1999-11-15 |
Family
ID=14173607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4096760A Expired - Fee Related JP2977366B2 (en) | 1992-04-16 | 1992-04-16 | Manufacturing method of austenitic stainless steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2977366B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2799569A4 (en) * | 2011-12-28 | 2016-03-09 | Posco | High strength austenitic stainless steel, and preparation method thereof |
-
1992
- 1992-04-16 JP JP4096760A patent/JP2977366B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2799569A4 (en) * | 2011-12-28 | 2016-03-09 | Posco | High strength austenitic stainless steel, and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2977366B2 (en) | 1999-11-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19990803 |
|
| LAPS | Cancellation because of no payment of annual fees |