JP3026232B2 - Manufacturing method of thin stainless steel slab with excellent corrosion resistance and workability - Google Patents
Manufacturing method of thin stainless steel slab with excellent corrosion resistance and workabilityInfo
- Publication number
- JP3026232B2 JP3026232B2 JP3101663A JP10166391A JP3026232B2 JP 3026232 B2 JP3026232 B2 JP 3026232B2 JP 3101663 A JP3101663 A JP 3101663A JP 10166391 A JP10166391 A JP 10166391A JP 3026232 B2 JP3026232 B2 JP 3026232B2
- Authority
- JP
- Japan
- Prior art keywords
- slab
- stainless steel
- corrosion resistance
- workability
- thin
- 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.)
- Expired - Fee Related
Links
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- Winding, Rewinding, Material Storage Devices (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、ステンレス鋼の薄鋳
片、特に耐食性と加工性に優れるステンレス鋼の薄鋳片
の製造方法に関するものである。近年、溶鋼から板厚1
0mm以下の薄鋳片を直接製造する技術が開発され、すで
に工業的規模での実施も行われている。新しいこの技術
は、熱間圧延工程が省略され、省エネルギー、省コスト
の面で大きく期待出来るプロセスであり、注目を集めて
いる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a thin slab of stainless steel, particularly a thin slab of stainless steel having excellent corrosion resistance and workability. In recent years, molten steel
Techniques for directly producing thin slabs of 0 mm or less have been developed and are already being implemented on an industrial scale. This new technology has been attracting attention because it eliminates the hot rolling step and is a process that can be greatly expected in terms of energy saving and cost saving.
【0002】[0002]
【従来の技術】従来、薄鋳片の製造方法においては、F
e−18%Cr−8%Niを主成分としたオーステナイ
ト系ステンレス鋼については、粗大な鋳片粒が原因で鋳
片を冷延した際に冷延板表面に発生するローピングとい
う問題がある。一方、Fe−17%Crを主成分とした
フェライト系ステンレス鋼については、鋳片を冷延焼鈍
して得られた薄板製品板を加工する際に、粗大な鋳片粒
が原因でリジングが発生すると言う問題がある。2. Description of the Related Art Conventionally, in a method of manufacturing a thin slab, F
An austenitic stainless steel containing e-18% Cr-8% Ni as a main component has a problem of roping that occurs on the surface of a cold-rolled sheet when the slab is cold-rolled due to coarse slab grains. On the other hand, for ferritic stainless steel containing Fe-17% Cr as a main component, ridging occurs due to coarse slab grains when processing a thin product sheet obtained by cold rolling and annealing a slab. There is a problem.
【0003】これらの問題を改善するためにTi,Nb
等の凝固組織微細化元素を活用する技術が検討されてい
るが、Ti,Nb等を含有するステンレス鋼薄鋳片の加
工性、耐食性に関して検討された例はない。例えば、CA
MP ISIJ Vol.1(1988)-1702でTi,Nbを添加したクロ
ム系ステンレス鋼薄鋳片の鋳片粒径と冷延焼鈍板のリジ
ングの関係が検討されており、又特願平1−1586号
ではオーステナイト系ステンレス鋼薄鋳片のγ粒微細化
のためにTi,Nbを添加する技術が検討されている
が、ステンレス鋼薄鋳片の加工性、耐食性に関しては述
べられていない。すなわち、この種のTi,Nbを含む
ステンレス鋼薄鋳片の加工性、耐錆性に関する研究はな
されていないのが現状である。In order to solve these problems, Ti, Nb
However, there is no study on the workability and corrosion resistance of stainless steel thin slabs containing Ti, Nb and the like. For example, CA
In MP ISIJ Vol.1 (1988) -1702, the relationship between the slab grain size of chromium-based stainless steel thin slabs added with Ti and Nb and the ridging of cold-rolled annealed sheets has been studied. In No. 1586, a technique of adding Ti and Nb to refine γ grains in austenitic stainless steel thin slabs is studied, but no mention is made of workability and corrosion resistance of the stainless steel thin slabs. That is, at present, no study has been made on the workability and rust resistance of such stainless steel slabs containing Ti and Nb.
【0004】[0004]
【発明が解決しようとする課題】ステンレス鋼にTi,
Nbを添加することは、鋼中のC,Nを固定し耐食性、
加工性を向上させるために、従来の熱延プロセスでもし
ばしば行われている。一般的な鋼種としてはSUS43
0LXやSUS304N,SUS321のようにTi,
Nbを含有する鋼種がある。SUMMARY OF THE INVENTION Ti,
By adding Nb, C and N in steel are fixed and corrosion resistance is improved.
In order to improve workability, it is often performed in a conventional hot rolling process. SUS43 is a common steel type.
Ti such as 0LX, SUS304N, SUS321
There are steel types containing Nb.
【0005】従来のスラブ連続鋳造−スラブ加熱−熱延
−冷延焼鈍プロセスでは、スラブ加熱中にTi,Nbが
炭化物、窒化物を形成し、母地のC,Nを固定してい
た。しかし、鋳造工程で薄鋳片を鋳造するプロセスで
は、スラブ加熱、熱延工程がなくなるため、Ti,Nb
を添加しても炭化物、窒化物が析出する時間がないた
め、母地のC,Nは十分に固定されない。そのために鋳
片の耐食性、加工性が熱延プロセス材よりも低くなる。
さらに、鋳片を冷延、焼鈍して得られた薄板の耐食性、
加工性も熱延プロセス材より低くなる。In the conventional slab continuous casting, slab heating, hot rolling and cold rolling annealing processes, Ti and Nb form carbides and nitrides during slab heating, and fix C and N of the base material. However, in the process of casting a thin slab in the casting step, the slab heating and hot rolling steps are eliminated, so that Ti, Nb
Does not have time to precipitate carbides and nitrides, so that C and N in the matrix are not sufficiently fixed. Therefore, the corrosion resistance and workability of the cast slab are lower than that of the hot rolled process material.
Furthermore, the corrosion resistance of the thin plate obtained by cold rolling and annealing the slab,
Workability is also lower than that of hot rolled process materials.
【0006】本発明は、このような従来技術の問題点を
解決することのできるステンレス鋼薄鋳片の製造方法を
提供することを目的とする。[0006] An object of the present invention is to provide a method of manufacturing a thin stainless steel slab which can solve such problems of the prior art.
【0007】[0007]
【課題を解決するための手段】上記の目的は、本発明に
よって達成される。すなわち、本発明の要旨とするとこ
ろは下記のとおりである。The above objects are achieved by the present invention. That is, the gist of the present invention is as follows.
【0008】重量で、C≦0.1%、Si≦5%、Mn
≦2%、Cr:9〜35%、Ni≦18%、Al≦7
%、Mo≦7%、TiおよびNbの何れか一方または双
方を合計量で0.05〜2.0%、N≦0.04%、残
部Feおよび不可避的不純物からなる鋼を厚さ6mm以
下の薄帯に連続鋳造した後、1200〜750℃の温度
域で巻取り、1200〜750℃の温度域に保持し、1
0〜60分間以内に水中に浸漬して600℃以下まで冷
却することを特徴とする耐食性と加工性に優れるステン
レス鋼薄鋳片の製造方法。[0008] By weight, C ≦ 0.1%, Si ≦ 5%, Mn
≦ 2%, Cr: 9-35%, Ni ≦ 18%, Al ≦ 7
%, Mo ≦ 7%, one or both of Ti and Nb in a total amount of 0.05 to 2.0%, N ≦ 0.04%, and a balance of steel having a thickness of 6 mm or less including Fe and unavoidable impurities. After continuous casting into a thin ribbon, it is wound in a temperature range of 1200 to 750 ° C., and is kept in a temperature range of 1200 to 750 ° C.
A method for producing a thin stainless steel slab excellent in corrosion resistance and workability, characterized by being immersed in water within 0 to 60 minutes and cooled to 600 ° C. or less.
【0009】[0009]
【作用】次に、本発明において、鋼の成分組成を上記の
様に数値限定した理由を説明する。C,Si,Mn,C
r,Ni,Al,Moについては従来からステンレス鋼
の基本成分として調整されていた量である。Next, the reason why the composition of steel in the present invention is numerically limited as described above will be described. C, Si, Mn, C
r, Ni, Al and Mo are the amounts that have been conventionally adjusted as the basic components of stainless steel.
【0010】Ti,Nbについて Ti,NbはC,Nと炭化物、窒化物を形成することで
Cr炭窒化物の粒界析出を防止し、耐食性、加工性を向
上させる有効な元素である。しかし過剰に添加すると大
型の析出物、介在物を形成して鋳造性を悪化させるとと
もに、介在物、析出物起点の発錆を生じるために、2.
0%以下にする。また1種でも2種の複合添加でもその
効果は同様である。Regarding Ti and Nb Ti and Nb are effective elements that form carbides and nitrides with C and N, thereby preventing grain boundary precipitation of Cr carbonitride and improving corrosion resistance and workability. However, if added in excess, large precipitates and inclusions are formed to deteriorate castability, and rusting occurs at the starting point of inclusions and precipitates.
0% or less. The same effect can be obtained by adding one kind or two kinds of composites.
【0011】次に、本発明において鋳片の巻取温度を特
定する理由を説明する。スラブ連鋳−スラブ加熱−熱延
プロセスでは鋳片の析出物を制御することが、各工程に
おいて容易にできた。しかし、薄肉連鋳プロセスでは鋳
片に熱を入れる工程がなく、鋳片は凝固後冷却されるだ
けである。従って、Ti,Nbを0.03%以上含有す
るステンレス鋼を薄肉連鋳プロセスで製造すると、炭化
物、窒化物の析出が不十分なため、スラブ連鋳−熱延プ
ロセス材より耐食性、加工性ともに低くなる。そこで本
発明者らは、薄鋳片の析出物制御方法を研究してきた
が、鋳造後、室温まで冷えた鋳片を再度加熱して析出さ
せるプロセス、鋳片を冷延した後に焼鈍して再結晶させ
る際に析出させるプロセスでは、十分に炭化物、窒化物
が析出しないことが判った。高温長時間の鋳片加熱、冷
延焼鈍板加熱を行って析出させても、析出物は非常に微
細に析出し、再結晶粒の成長を阻害する等、製品への悪
影響が生じた。Next, the reason for specifying the winding temperature of the slab in the present invention will be described. In the slab continuous casting-slab heating-hot rolling process, it was possible to easily control the precipitate of the slab in each step. However, in the thin continuous casting process, there is no step of applying heat to the slab, and the slab is only cooled after solidification. Therefore, when a stainless steel containing 0.03% or more of Ti and Nb is produced by a thin-wall continuous casting process, precipitation of carbides and nitrides is insufficient. Lower. Therefore, the present inventors have studied a method for controlling precipitates in thin slabs.However, after casting, a process of reheating and precipitating slabs cooled to room temperature, a process of cold-rolling slabs and then reannealing the slabs. It was found that in the process of precipitation during crystallization, carbides and nitrides were not sufficiently precipitated. Even when the slab and the cold-rolled annealed plate were heated and heated for a long time to precipitate, the precipitates were deposited very finely, which hindered the growth of recrystallized grains and had adverse effects on the product.
【0012】従って、鋳片のTi,Nbは、鋳片が室温
まで冷える過程で炭化物、窒化物として析出させること
が必要である。その方法としては鋳片の熱を利用して鋳
片巻取り時に析出させることが望ましい。鋳片巻取温度
を制御することによる鋳片の析出物制御は薄肉連鋳プロ
セスにおけるキーテクノロジーであり、本発明者らの独
自技術である。Therefore, it is necessary to precipitate Ti and Nb as carbides and nitrides in the process of cooling the slab to room temperature. As a method thereof, it is desirable to use the heat of the slab to precipitate the slab during winding. The control of the slab precipitate by controlling the slab winding temperature is a key technology in the thin-wall continuous casting process, and is a unique technology of the present inventors.
【0013】巻き取った鋳片はコイル端部以外は温度低
下も少ないため巻取った温度近くで数十分から数時間程
度加熱される。そのため巻取温度が鋳片の保熱温度とな
る。本発明者らの研究によると鋳片のTi,Nbを炭化
物、窒化物として析出させる保熱温度としては1200
〜750℃が有効である。図1に鋳片の巻取温度と鋳片
の耐食性の関係を示す。鋳片の巻取温度を750℃以上
にすることによって耐食性が向上するのが判る。Since the temperature of the wound slab except for the coil ends is small, the slab is heated at a temperature close to the wound temperature for several tens of minutes to several hours. Therefore, the winding temperature becomes the heat retention temperature of the slab. According to the study of the present inventors, Ti and Nb of the slab were carbonized.
Heat retention temperature for depositing as a product or nitride is 1200
~ 750 ° C is effective. FIG. 1 shows the relationship between the winding temperature of the slab and the corrosion resistance of the slab. It can be seen that the corrosion resistance is improved by setting the slab winding temperature to 750 ° C. or higher.
【0014】図2に鋳片の巻取温度と鋳片を冷延焼鈍し
た薄板製品の伸びの関係を示す。鋳片の巻取温度が80
0℃以下では製品の伸びが低くなることが判る。図3に
鋳片の巻取温度と鋳片を冷延した際に発生する冷延板の
肌荒れ(ローピング)の関係を示す。高温巻取りによっ
て炭窒化物の析出は促進されるが、鋳片の粒が成長する
ため、冷延板表面にローピングが発生する。粒成長は1
200℃超で急速に進み、その結果、ローピングが大き
くなるため、冷延板の表面性状を劣化させる。従って、
ローピングの観点から巻取温度は1200℃以下にする
事が必要である。FIG. 2 shows the relationship between the coiling temperature of the slab and the elongation of the sheet product obtained by cold rolling and annealing the slab. The slab winding temperature is 80
It is understood that the elongation of the product is lower at 0 ° C. or lower. FIG. 3 shows the relationship between the coiling temperature of the slab and the roughening (roping) of the cold-rolled sheet that occurs when the slab is cold-rolled. Although the precipitation of carbonitride is promoted by the high-temperature winding, roping occurs on the surface of the cold-rolled sheet because the grains of the slab grow. 1 grain growth
The temperature rapidly advances at more than 200 ° C., and as a result, the roping becomes large, thereby deteriorating the surface properties of the cold-rolled sheet. Therefore,
From the viewpoint of roping, the winding temperature needs to be 1200 ° C. or less.
【0015】但し、750℃以上の温度で巻き取った鋳
片はCr炭化物の析出領域である700〜600℃の温
度域を緩冷されるため、炭化物が析出する。高Crステ
ンレス鋼、高Alステンレス鋼のように母相の靱性が低
い鋼種はCr炭化物の析出によって、さらに靱性が低く
なるため、Cr炭化物の析出を防止することが必要であ
る。その方法として1200〜750℃で巻取った後、
1200〜750℃に保持し、10〜60分以内に水冷
して600℃以下まで冷却する必要がある。However, since the cast slab wound at a temperature of 750 ° C. or more is slowly cooled in a temperature range of 700 to 600 ° C., which is a precipitation region of Cr carbide, carbide is precipitated. Steel types with low matrix toughness, such as high Cr stainless steel and high Al stainless steel, have a further reduced toughness due to the precipitation of Cr carbide, so it is necessary to prevent the precipitation of Cr carbide. After I wound up at 1200 to 750 ° C. As the method,
It is necessary to keep the temperature at 1200 to 750 ° C and to cool it to 600 ° C or less by water cooling within 10 to 60 minutes.
【0016】従って、上述の如き成分組成、巻取温度制
御によって加工性、耐食性の優れるステンレス鋼薄鋳片
が製造できる。Accordingly, a thin stainless steel slab having excellent workability and corrosion resistance can be manufactured by controlling the component composition and the winding temperature as described above.
【0017】[0017]
【実施例】高周波誘導炉にて表1の組成のステンレス溶
鋼を10ton 溶製し、双ロール鋳造機で800mm幅で板
厚2mmの薄鋳片を鋳造し、表2の条件で巻取った。該鋳
片の耐食性試験(孔食電位測定)を行うと共に、鋳片を
酸洗し、80%の冷間圧延を施した後、フェライト系ス
テンレス鋼は950℃で60秒、オーステナイト系ステ
ンレス鋼は1100℃で60秒焼鈍して薄板製品とし、
引張試験を行った。EXAMPLE In a high-frequency induction furnace, 10 tons of molten stainless steel having the composition shown in Table 1 were melted, and a thin cast piece having a width of 800 mm and a thickness of 2 mm was cast by a twin-roll caster and wound under the conditions shown in Table 2. After performing a corrosion resistance test (pitting potential measurement) on the slab, pickling the slab and performing cold rolling of 80%, the ferritic stainless steel was heated at 950 ° C. for 60 seconds, and the austenitic stainless steel was Annealed at 1100 ° C for 60 seconds to make a thin plate product,
A tensile test was performed.
【0018】表2に示すように本発明対象鋼は鋳片の耐
食性に優れ、薄板製品の加工性も良好であるが、比較鋼
は鋳片の耐食性が悪く、薄板製品の加工性も低いことが
判った。As shown in Table 2, the steel subject to the present invention has excellent corrosion resistance of cast slabs and good workability of thin plate products, while the comparative steel has poor corrosion resistance of cast slabs and low workability of thin plate products. I understood.
【0019】[0019]
【表1】 [Table 1]
【0020】[0020]
【表2】 [Table 2]
【0021】[0021]
【発明の効果】以上説明したように、本発明に従って製
造したステンレス鋼薄鋳片は鋳造のままで良好な耐食性
を有しており、冷延焼鈍した薄板製品の加工性も良好で
ある。従って、薄鋳片としての適応分野が著しく拡大さ
れる。As described above, the stainless steel thin slab produced according to the present invention has good corrosion resistance as cast, and also has good workability of cold rolled and annealed sheet products. Therefore, the field of application as a thin slab is significantly expanded.
【図1】鋳片の巻取温度と鋳片の耐食性の関係を示す図
である。FIG. 1 is a diagram showing the relationship between the casting temperature of a slab and the corrosion resistance of the slab.
【図2】鋳片の巻取温度と冷延焼鈍板の伸びの関係を示
す図である。FIG. 2 is a diagram showing the relationship between the winding temperature of a slab and the elongation of a cold-rolled annealed sheet.
【図3】鋳片の巻取温度と冷延板の表面粗度(ローピン
グ)の関係を示す図である。FIG. 3 is a view showing the relationship between the winding temperature of a slab and the surface roughness (roping) of a cold rolled sheet.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 FI C22C 38/00 302 C22C 38/00 302Z 38/58 38/58 (58)調査した分野(Int.Cl.7,DB名) B22D 11/00 B22D 11/12 B22D 11/124 B21C 47/26 C21D 9/46 C22C 38/00 C22C 38/58 ──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. 7 identification code FI C22C 38/00 302 C22C 38/00 302Z 38/58 38/58 (58) Field surveyed (Int.Cl. 7 , DB name) B22D 11/00 B22D 11/12 B22D 11/124 B21C 47/26 C21D 9/46 C22C 38/00 C22C 38/58
Claims (1)
n≦2%、Cr:9〜35%、Ni≦18%、Al≦7
%、Mo≦7%、TiおよびNbの何れか一方または双
方を合計量で0.05〜2.0%、N≦0.04%、残
部Feおよび不可避的不純物からなる鋼を厚さ6mm以
下の薄帯に連続鋳造した後、1200〜750℃の温度
域で巻取り、1200〜750℃の温度域に保持し、1
0〜60分間以内に水中に浸漬して600℃以下まで冷
却することを特徴とする耐食性と加工性に優れるステン
レス鋼薄鋳片の製造方法。1. By weight, C ≦ 0.1%, Si ≦ 5%, M
n ≦ 2%, Cr: 9 to 35%, Ni ≦ 18%, Al ≦ 7
%, Mo ≦ 7%, one or both of Ti and Nb in a total amount of 0.05 to 2.0%, N ≦ 0.04%, and a balance of steel having a thickness of 6 mm or less including Fe and unavoidable impurities. After continuous casting into a thin ribbon, it is wound in a temperature range of 1200 to 750 ° C., and is kept in a temperature range of 1200 to 750 ° C.
A method for producing a thin stainless steel slab excellent in corrosion resistance and workability, characterized by being immersed in water within 0 to 60 minutes and cooled to 600 ° C. or less.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3101663A JP3026232B2 (en) | 1991-05-07 | 1991-05-07 | Manufacturing method of thin stainless steel slab with excellent corrosion resistance and workability |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3101663A JP3026232B2 (en) | 1991-05-07 | 1991-05-07 | Manufacturing method of thin stainless steel slab with excellent corrosion resistance and workability |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04333347A JPH04333347A (en) | 1992-11-20 |
JP3026232B2 true JP3026232B2 (en) | 2000-03-27 |
Family
ID=14306615
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JP3101663A Expired - Fee Related JP3026232B2 (en) | 1991-05-07 | 1991-05-07 | Manufacturing method of thin stainless steel slab with excellent corrosion resistance and workability |
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JP (1) | JP3026232B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06220545A (en) * | 1993-01-28 | 1994-08-09 | Nippon Steel Corp | Production of cr-series stainless steel thin strip excellent in toughness |
KR101279246B1 (en) * | 2009-12-03 | 2013-06-26 | 주식회사 포스코 | method of manufacturing austenitic stainless steel with good surface quality |
-
1991
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JPH04333347A (en) | 1992-11-20 |
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