JPH055129A - Production of hot rolled multilayer steel plate having surface layer composed of austenitic stainless steel and excellent in corrosion resistance and deep drawability - Google Patents
Production of hot rolled multilayer steel plate having surface layer composed of austenitic stainless steel and excellent in corrosion resistance and deep drawabilityInfo
- Publication number
- JPH055129A JPH055129A JP14634391A JP14634391A JPH055129A JP H055129 A JPH055129 A JP H055129A JP 14634391 A JP14634391 A JP 14634391A JP 14634391 A JP14634391 A JP 14634391A JP H055129 A JPH055129 A JP H055129A
- Authority
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- Japan
- Prior art keywords
- steel
- austenitic stainless
- stainless steel
- corrosion resistance
- hot rolled
- 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.)
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- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は建材、自動車をはじめと
する一般加工用、構造材料として利用される耐食性、加
工性および深絞り性に優れた表層オーステナイト系ステ
ンレス複層熱延鋼板の製造法に関するものである。FIELD OF THE INVENTION The present invention relates to a method for producing a surface austenitic stainless multi-layer hot rolled steel sheet having excellent corrosion resistance, workability and deep drawability, which is used as a construction material, for general processing including automobiles, and as a structural material. It is about.
【０００２】[0002]
【従来の技術】建築、厨房器具、自動車などに使用され
る鋼板は、従来、その耐食性を高めるためその表面に塗
装、めっきなどを行い使用されてきたが、近年、より耐
食性を高めるため各方面でステンレス鋼板の使用が多く
なっている。例えば長期にわたる美観が要求される建築
外板や厨房器具、高温環境にさらされるため腐食が激し
い自動車のマフラー、各種プラントにおけるタンク、配
管などあらゆる分野で需要が増大している。一方、ステ
ンレス鋼は耐食性の点では優れているがコストが普通鋼
に比べて著しく高い。このため耐食性が優れかつ製造コ
ストの低い鋼板として従来から表層を耐食性が良好なス
テンレス鋼とし内層を安価な普通鋼とするクラッド鋼板
が開発されてきた。2. Description of the Related Art Steel plates used for construction, kitchen appliances, automobiles, etc. have been conventionally coated and plated on their surfaces to improve their corrosion resistance. Therefore, the use of stainless steel sheets is increasing. For example, demand is increasing in all fields such as building exterior panels and kitchen appliances that require long-term aesthetics, automobile mufflers that are highly corroded by being exposed to high-temperature environments, tanks and piping in various plants. On the other hand, stainless steel is excellent in corrosion resistance, but its cost is significantly higher than that of ordinary steel. Therefore, as a steel sheet having excellent corrosion resistance and low manufacturing cost, a clad steel sheet having a stainless steel surface having a good corrosion resistance and an inexpensive common steel inner layer has been developed.
【０００３】しかし、これらのステンレスクラッド鋼板
では以前から次のような問題点が指摘されている。 １）普通鋼中のＣとステンレス鋼中のＣｒの親和性が高
く、普通鋼からステンレス鋼へのＣの拡散が起こり、表
層ステンレス鋼中にＣｒ炭化物を形成しステンレス鋼の
耐食性が劣化する。However, the following problems have been pointed out for these stainless clad steel sheets. 1) The affinity between C in ordinary steel and Cr in stainless steel is high, diffusion of C from ordinary steel to stainless steel occurs, Cr carbide is formed in the surface stainless steel, and the corrosion resistance of the stainless steel deteriorates.
【０００４】２）クラッド鋼板の加工性をよくするため
には、表層ステンレス鋼および内層普通鋼ともに十分な
再結晶をしていることが必要であるが、ステンレス鋼の
再結晶に十分な熱処理を行うと内層の普通鋼が粗粒化
し、加工後オレンジピールと称する表面欠陥が発生する
と同時に加工性も劣化する。 ３）特に再結晶温度が高い高合金ステンレス鋼を表層と
した場合や加工性確保の観点から、表層ステンレス鋼に
合わせた高温での熱処理を行うと内層の普通鋼について
はＡｃ3変態点を越えるため、内層の普通鋼の集合組織
はランダムなものとなり深絞り性が劣化する。2) In order to improve the workability of the clad steel sheet, it is necessary that both the surface stainless steel and the inner ordinary steel are sufficiently recrystallized, but a sufficient heat treatment is required for the recrystallization of the stainless steel. If this is done, the ordinary steel in the inner layer will be coarsened, and after processing, surface defects called orange peel will occur and at the same time the workability will deteriorate. 3) Especially when a high alloy stainless steel having a high recrystallization temperature is used as the surface layer or from the viewpoint of ensuring workability, heat treatment at a high temperature suitable for the surface layer stainless steel causes the inner layer of ordinary steel to exceed the Ac 3 transformation point. Therefore, the texture of ordinary steel in the inner layer becomes random and the deep drawability deteriorates.
【０００５】これらを解決するため、これまでに種々の
方策が採られてきた。 問題点１）に対しては、特公昭５８−１５３１０号、特
公平１−７１３８号、特開昭６２−５４０２０号の各公
報に示されるように、普通鋼のＣ量低減をはかり、さら
にＴｉ、ＮｂなどのＣ固定元素や各種の元素を添加する
といった手段が考えられている。また別の方法として界
面層にＮｉめっきしたり、Ｎｉ箔を挿入する方法も提案
されている。To solve these problems, various measures have been taken so far. To solve the problem 1), as disclosed in JP-B-58-15310, JP-B-1-7138, and JP-A-62-54020, the C content of ordinary steel is reduced, and Ti is further reduced. Means for adding C-fixing elements such as Nb, Nb and various elements have been considered. As another method, a method of plating the interface layer with Ni or inserting a Ni foil has been proposed.
【０００６】問題点２）については、Ｎｂ、Ｂといった
元素を添加する方法が提案されている。また特開昭６２
−７４０２５号、特開昭６２−１６８９２号、特開昭６
２−８０２２３号などの各公報により、熱延仕上温度、
巻取温度、焼鈍温度、加熱速度などの熱処理サイクルを
限定する方法が開示されている。これらの方法のうち、
合金添加による方法は問題点１）および２）を両立させ
ることを考えていないため、一つの課題については有効
であるが、もう一方の課題については十分な解決法とな
っていない。また熱処理サイクルを限定する方法は生産
性を低下させるばかりか、加工性の劣化は避けられな
い。そしてこれらの方法はいずれも問題点３）について
の考慮がなされていない。Regarding the problem 2), a method of adding elements such as Nb and B has been proposed. In addition, JP-A-62
-74025, JP 62-16892A, JP 6A
According to various publications such as No. 2-80223, the hot rolling finish temperature,
A method for limiting a heat treatment cycle such as a winding temperature, an annealing temperature, and a heating rate is disclosed. Of these methods,
The method by addition of an alloy is not considered to satisfy both the problems 1) and 2), and therefore is effective for one problem, but is not a sufficient solution for the other problem. Further, the method of limiting the heat treatment cycle not only lowers the productivity but also deteriorates the workability. None of these methods considers the problem 3).
【０００７】問題点３）については、特開昭６２−１２
４２２９号公報に、焼鈍を比較的低温で行う方法が開示
されているが、同公報記載の温度では表層ステンレス鋼
の再結晶は十分とはいえず、加工性の点で完全とはいえ
ない。Regarding the problem 3), JP-A-62-12
Japanese Patent No. 4229 discloses a method of performing annealing at a relatively low temperature. However, at the temperature described in the publication, recrystallization of surface layer stainless steel is not sufficient and workability is not complete.
【０００８】[0008]
【発明が解決しようとする課題】本発明は高耐食性と低
コストを両立させる表層オーステナイト系ステンレス
鋼、内層普通鋼からなるステンレスクラッド鋼板におい
て問題となる、 １）表層ステンレス鋼の耐食性を劣化させる内層普通鋼
からのＣ拡散、 ２）加工時の表面欠陥および加工性劣化の原因となる内
層普通鋼の粗粒化、 ３）かつ深絞り性を劣化させる変態による集合組織のラ
ンダム化、を抑制し、高耐食性と低コストに加えて、高
加工性、高深絞り性を兼ね備えた表層オーステナイト系
ステンレス複層熱延鋼板を、生産性を阻害する熱処理サ
イクルの制限を受けることなく安定して得ることのでき
る製造方法を提供することを目的とする。DISCLOSURE OF THE INVENTION The present invention has a problem in a stainless clad steel plate composed of a surface austenitic stainless steel and an inner layer ordinary steel that achieves both high corrosion resistance and low cost. 1) Inner layer that deteriorates the corrosion resistance of the surface stainless steel Suppresses C diffusion from ordinary steel, 2) coarsening of the inner layer ordinary steel that causes surface defects during processing and deterioration of workability, and 3) randomization of texture due to transformation that deteriorates deep drawability. In addition to high corrosion resistance and low cost, it is possible to stably obtain a surface austenitic stainless multi-layer hot rolled steel sheet that has high workability and high deep drawability without being restricted by the heat treatment cycle that hinders productivity. It is an object of the present invention to provide a manufacturing method that can be performed.
【０００９】[0009]
【課題を解決するための手段】本発明は前記の問題点を
解決する内層普通鋼の成分と製造条件について検討の結
果得られたもので、その骨子とするところ下記のとおり
である。 １）Ｃ拡散、粗粒化を抑制し、かつ高加工性、高深絞り
性を確保するため内層普通鋼は低Ｃ成分とすると同時に
Ｔｉ、Ｎｂを適当量添加することにより、その後の熱処
理サイクルに影響されずに微細炭化物を析出させる。The present invention was obtained as a result of studying the composition and manufacturing conditions of an inner layer ordinary steel which solves the above problems, and the main points thereof are as follows. 1) In order to suppress C diffusion and coarsening, and to secure high formability and high deep drawability, the inner layer ordinary steel has a low C content, and at the same time, appropriate amounts of Ti and Nb are added to the subsequent heat treatment cycle. Precipitates fine carbides without being affected.
【００１０】２）粗粒化の抑制とＡｃ3変態点上昇のた
め、内層普通鋼にＳｉ、Ａｌ、Ｐを添加する。 ３）熱間圧延は仕上温度を９２０℃未満として熱延途中
での再結晶と局部的な粗大化粒発生を防止し、熱延板焼
鈍して深絞り性を高め、併せて表面凹凸発生欠陥を防
ぐ。2) To suppress coarsening and raise the Ac 3 transformation point, Si, Al and P are added to the inner layer ordinary steel. 3) In hot rolling, the finishing temperature is set to less than 920 ° C to prevent recrystallization during the hot rolling and local coarsening grain generation, and to anneal the hot rolled sheet to enhance the deep drawability, and at the same time, generate surface irregularities defects. prevent.
【００１１】[0011]
【作用】以下、本発明を詳細に説明する。まず、表層部
の鋼成分に関して述べる。本発明では表層はオーステナ
イト系ステンレス鋼であり、その成分は特に限定するも
のではなく、用途に応じて最適な成分系のオーステナイ
ト系ステンレス鋼が用いられる。The present invention will be described in detail below. First, the steel composition of the surface layer will be described. In the present invention, the surface layer is an austenitic stainless steel, and its components are not particularly limited, and an austenitic stainless steel having an optimal component system according to the application is used.
【００１２】次に内層の普通鋼成分に関して述べる。Ｃ
は表層ステンレス鋼への拡散の抑制および加工性を勘案
して低く抑えるが、本発明では粗粒化防止に炭化物を利
用することから０．０００５％以上を含有させる。その
含有量が多くなると表層オーステナイト系ステンレス鋼
特有の耐食性が劣化し、また深絞り性が劣化するので
０．０１５０％以下とする。Next, the ordinary steel composition of the inner layer will be described. C
Is suppressed to a low level in consideration of suppression of diffusion into the surface layer stainless steel and workability, but in the present invention, 0.0005% or more is contained because a carbide is used to prevent coarsening. If the content is large, the corrosion resistance peculiar to the surface austenitic stainless steel deteriorates, and the deep drawability deteriorates, so it is made 0.0150% or less.
【００１３】Ｎは加工性を勘案して低く抑えるが、本発
明では粗粒化防止に窒化物を利用することから０．００
０５％以上を含有させる。またＮはＣのように表層ステ
ンレス鋼への拡散が起きても、その耐食性を阻害するこ
とはないので粒成長抑制のため添加するが、その量が多
くなると硬質化し、また深絞り性が劣化するので上限を
０．０２００％とする。N is suppressed to a low value in consideration of workability, but in the present invention, 0.001 is used because a nitride is used to prevent coarsening.
Include at least 05%. Further, N does not hinder the corrosion resistance even if it diffuses into the surface stainless steel like C, so N is added to suppress grain growth, but if the amount increases, it hardens and the deep drawability deteriorates. Therefore, the upper limit is made 0.0200%.
【００１４】Ｓｉ、Ａｌ、ＰはＡｃ3変態点上昇および
粗粒化防止のために添加される元素であり、その含有量
は高いほど変態点は上昇する。含有量が少ないと本発明
が目的とする焼鈍時の変態抑制および粒成長抑制の効果
が得られない。しかし過剰な添加は、高温においてもフ
ェライト単相となり熱間圧延後に特異な集合組織が形成
され、表面欠陥、加工性劣化の原因となるばかりでなく
合金コストの上昇を招くため範囲を ３０≧８０×Ｐ（％）＋７×Ｓｉ（％）＋２０×Ａｌ（％）≧３ とする。Si, Al and P are elements added to raise the Ac 3 transformation point and prevent coarsening, and the higher the content, the higher the transformation point. If the content is too small, the effect of suppressing transformation and grain growth during annealing, which is the object of the present invention, cannot be obtained. However, excessive addition causes a ferrite single phase even at high temperature to form a peculiar texture after hot rolling, which not only causes surface defects and workability deterioration but also causes an increase in alloy cost, so the range is 30 ≧ 80. × P (%) + 7 × Si (%) + 20 × Al (%) ≧ 3.
【００１５】Ｔｉ、ＮｂはＣ拡散抑制、粒成長抑制、高
加工性確保のために添加される。その必要量はＣ、Ｎ量
に依存しており少ない場合は上記の効果が得られない。
また過剰な添加はコストの上昇をもたらし、かつ析出物
を粗大にし粒成長の抑制効果を失うばかりか加工性も劣
化させるため範囲を 8.0 ≧Ti(%)/［４×Ｃ(%) ＋3.4 ×Ｎ(%) ］＋Nb(%)/［7.7 ×Ｃ(%) ］≧0.4 とする。Ti and Nb are added for suppressing C diffusion, suppressing grain growth, and ensuring high workability. The required amount depends on the amounts of C and N, and if it is small, the above effect cannot be obtained.
In addition, excessive addition causes an increase in cost, and not only the precipitate becomes coarse and the effect of suppressing grain growth is lost, but also the workability is deteriorated, so the range is 8.0 ≧ Ti (%) / [4 × C (%) +3. 4 × N (%)] + Nb (%) / [7.7 × C (%)] ≧ 0.4.
【００１６】Ｂは必要に応じて添加されるが、Ｔｉまた
はＮｂあるいはこれら両元素とともに複合添加されるこ
とにより、析出物を微細にし、高温での粒成長を抑制す
る効果を増大させる。粒成長抑制効果の発現とコスト上
昇の点から下限を０．０００２％、上限を０．００６０
％とする。ＭｏもＢと同様、ＴｉまたはＮｂあるいはこ
れら両元素とともに複合添加されることにより、析出物
を微細にし高温での粒成長を抑制する効果を増大させ
る。粒成長抑制効果の発現とコスト上昇の点から下限を
０．００５％、上限を０．５００％とする。B is added as needed, but by adding it together with Ti or Nb or both of these elements, the precipitates are made finer and the effect of suppressing grain growth at high temperature is increased. The lower limit is 0.0002% and the upper limit is 0.0060 from the viewpoint of the effect of suppressing grain growth and the cost increase.
%. Similar to B, Mo is also added together with Ti or Nb or both of these elements to increase the effect of making the precipitates finer and suppressing grain growth at high temperatures. The lower limit is set to 0.005% and the upper limit is set to 0.500% from the viewpoint of the effect of suppressing grain growth and the cost increase.
【００１７】次に表層および内層の厚みについて述べ
る。鋼板表層の厚みは、加工時に表層のステンレス鋼が
破れて鉄面が露出し、耐食性が損なわれることを防止す
るために、全厚の２％以上（両表層の場合両表層合計で
４％以上）とする。また上限については、オーステナイ
ト系ステンレス鋼の量を減じてコスト上昇を防ぐために
全厚の３０％以下（両表層の場合両表層合計で６０％以
下）とする。Next, the thickness of the surface layer and the inner layer will be described. The thickness of the steel sheet surface layer is 2% or more of the total thickness (4% or more in total in the case of both surface layers in order to prevent the stainless steel of the surface layer from being broken and the iron surface exposed to expose the corrosion resistance during processing. ). The upper limit is 30% or less of the total thickness (in the case of both surface layers, the total of both surface layers is 60% or less) in order to reduce the amount of austenitic stainless steel and prevent cost increase.
【００１８】上記不均一成分を有する複層鋼片の製造法
については特に限定しないが、例えば次の方法が採用さ
れる。 イ）鋳ぐるみ法 ロ）２本イマージョンノズル法 ハ）爆着法 これらの方法の内、鋼の溶製後鋳造段階で複層化を行う
ことが工業的に適しており、特に連続鋳造法で製造する
ことが最も経済的である。The method for producing the multi-layer steel billet having the above-mentioned non-uniform composition is not particularly limited, but the following method is adopted, for example. B) Casting method b) Two-immersion nozzle method c) Explosive deposition method Among these methods, it is industrially suitable to carry out multi-layering at the casting stage after the melting of steel, especially in the continuous casting method. Most economical to manufacture.
【００１９】本発明に従った成分組成の鋼は鋳造後熱延
され、さらに焼鈍ラインで熱延板焼鈍される。熱間圧延
前の鋼片加熱温度は表層Ｃｒが十分溶体化する１０５０
℃以上であればよい。仕上温度は９２０℃未満とする。
これ以上の高温になると内層普通鋼が熱間圧延中に再結
晶または回復し、焼鈍後の深絞り性向上効果が小さくな
る。さらにその再結晶粒は粗大になるため加工後に表面
欠陥を生ずる。巻取温度はその後に熱延板焼鈍を行うた
め特に限定されない。The steel having the chemical composition according to the present invention is hot-rolled after casting, and is then annealed in an annealing line. The heating temperature of the billet before hot rolling is such that the surface Cr is sufficiently solutionized to 1050.
It may be at least ° C. The finishing temperature is less than 920 ° C.
When the temperature is higher than this, the inner layer ordinary steel is recrystallized or recovered during hot rolling, and the effect of improving the deep drawability after annealing becomes small. Furthermore, since the recrystallized grains become coarse, surface defects occur after processing. The coiling temperature is not particularly limited because the hot rolled sheet is annealed thereafter.
【００２０】その後、熱延板焼鈍が施されるが、この温
度は加工性の確保およびＣｒ炭化物溶体化の観点から８
５０℃以上とする。加工性、深絞り性確保の点からは焼
鈍温度は高温であるほど望ましく、内層普通鋼のＡｃ3
変態点以下であれば良好な深絞り性が維持される。しか
し、余り高温になると表層ステンレス鋼、または内層普
通鋼に粗大粒が発生することおよび製造コストの観点か
ら上限を１２５０℃とする。Thereafter, the hot-rolled sheet is annealed, but this temperature is 8 from the viewpoint of ensuring workability and solution of Cr carbide.
The temperature is 50 ° C or higher. Processability, annealing temperature from the viewpoint of the deep drawability ensured desirable than is a high temperature, the inner layer of carbon steel Ac 3
Good deep drawability is maintained at a temperature not higher than the transformation point. However, if the temperature becomes too high, the upper limit is set to 1250 ° C. from the viewpoint that coarse grains are generated in the surface layer stainless steel or the inner layer ordinary steel and the manufacturing cost is high.
【００２１】本発明により得られた複層熱延鋼板は、亜
鉛、錫、クロム、アルミニウム等でめっきする表面処理
鋼板の素材としても利用できる。The multi-layer hot rolled steel sheet obtained by the present invention can also be used as a material for a surface-treated steel sheet plated with zinc, tin, chromium, aluminum or the like.
【００２２】[0022]
【実施例】表層及び内層用溶鋼を表１に示す成分に調整
し、２本イマージョンノズル法により複層鋳片を得た。
表層の厚みは両表層同一とし、全厚に対する両表層合計
の比率を表２に示す。これらのスラブを表２に示す条件
で熱延し、板厚２．０mmの熱延板に仕上げ、特性評価を
行った。[Example] The molten steels for the surface layer and the inner layer were adjusted to the components shown in Table 1, and a multi-layer cast product was obtained by the two-immersion nozzle method.
The thickness of both surface layers is the same, and the ratio of the total thickness of both surface layers to the total thickness is shown in Table 2. These slabs were hot-rolled under the conditions shown in Table 2, finished into hot-rolled sheets with a plate thickness of 2.0 mm, and evaluated for characteristics.
【００２３】本発明に従って得られた鋼板（試料番号
１、５、６、８、９、１０、１２）は表面欠陥がなく、
高加工性、高深絞り性を達成しているのに対し、比較鋼
は表面状況、加工性、深絞り性が良好でない。The steel sheets (Sample Nos. 1, 5, 6, 8, 9, 10, 12) obtained according to the present invention were free of surface defects,
While high formability and high deep drawability are achieved, the comparative steels are not good in surface condition, formability and deep drawability.
【００２４】[0024]
【表１】 [Table 1]
【００２５】[0025]
【表２】 [Table 2]
【００２６】[0026]
【発明の効果】以上述べたごとく、本発明によれば高耐
食性、高加工性、高深絞り性、低コストを両立させた表
層オーステナイト系ステンレス鋼、内層普通鋼からなる
ステンレス複層熱延鋼板を製造できる。As described above, according to the present invention, a stainless multi-layer hot-rolled steel sheet made of a surface austenitic stainless steel and an inner plain steel, which has high corrosion resistance, high workability, high deep drawability, and low cost, can be obtained. Can be manufactured.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ２３Ｃ 30/00 Ｂ 7217−4Ｋ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI technical display location C23C 30/00 B 7217-4K
Claims (1)
鋼、内層部が重量％で、Ｃ：０．０００５〜０．０１５
０％、Ｎ：０．０００５〜０．０２００％、Ｓｉ、Ｐ、
Ａｌを下記式（１）を満たすように含み、 ３０≧８０×Ｐ(%) ＋７×Ｓｉ(%) ＋２０×Ａｌ(%) ≧３・・・・（１） さらに、Ｔｉ、Ｎｂの１種または２種を下記式（２）を
満たすように含み、 8.0 ≧Ti(%)/［４×Ｃ(%) ＋3.4 ×Ｎ(%) ］＋Nb(%)/［7.7 ×Ｃ(%) ］≧0.4 ・・・・（２） 残部が鉄および不可避的不純物からなる鋼で構成され、
前記表層部の全板厚に対する比率を片側２％以上３０％
以下とした鋼片を、９２０℃未満の仕上温度で熱間圧延
し、その後、８５０〜１２５０℃で熱延板焼鈍すること
を特徴とする耐食性と深絞り性に優れた表層オーステナ
イト系ステンレス複層熱延鋼板の製造法。 【請求項２】 表層部がオーステナイト系ステンレス
鋼、内層部が重量％で、Ｃ：０．０００５〜０．０１５
０％、Ｎ：０．０００５〜０．０２００％、Ｓｉ、Ｐ、
Ａｌを下記式（１）を満たすように含み、 ３０≧８０×Ｐ(%) ＋７×Ｓｉ(%) ＋２０×Ａｌ(%) ≧３・・・・（１） さらに、Ｔｉ、Ｎｂの１種または２種を下記式（２）を
満たすように含み、 8.0 ≧Ti(%)/［４×Ｃ(%) ＋3.4 ×Ｎ(%) ］＋Nb(%)/［7.7 ×Ｃ(%) ］≧0.4 ・・・・（２） かつＢ：０．０００２〜０．００６０％、Ｍｏ：０．０
０５〜０．５００％の１種または２種を含有し、残部が
鉄および不可避的不純物からなる鋼で構成され、前記表
層部の全板厚に対する比率を片側２％以上３０％以下と
した鋼片を、９２０℃未満の仕上温度で熱間圧延し、そ
の後、８５０〜１２５０℃で熱延板焼鈍することを特徴
とする耐食性と深絞り性に優れた表層オーステナイト系
ステンレス複層熱延鋼板の製造法。Claims: 1. The surface layer portion is austenitic stainless steel, the inner layer portion is wt%, C: 0.0005-0.015
0%, N: 0.0005 to 0.0200%, Si, P,
Al is included so as to satisfy the following formula (1): 30 ≧ 80 × P (%) + 7 × Si (%) + 20 × Al (%) ≧ 3 ... (1) Further, one kind of Ti and Nb Or, two kinds are included so as to satisfy the following formula (2), and 8.0 ≧ Ti (%) / [4 × C (%) + 3.4 × N (%)] + Nb (%) / [7.7 × C (%) ] ≧ 0.4 ··· (2) The balance consists of steel consisting of iron and inevitable impurities,
The ratio of the surface layer to the total plate thickness is 2% or more and 30% on one side.
The following steel slabs are hot-rolled at a finishing temperature of less than 920 ° C., and then hot-rolled sheet annealed at 850 to 1250 ° C., which is a surface austenitic stainless multilayer having excellent corrosion resistance and deep drawability. Hot rolled steel sheet manufacturing method. 2. The surface layer portion is austenitic stainless steel, the inner layer portion is wt%, and C: 0.0005 to 0.015.
0%, N: 0.0005 to 0.0200%, Si, P,
Al is included so as to satisfy the following formula (1): 30 ≧ 80 × P (%) + 7 × Si (%) + 20 × Al (%) ≧ 3 ... (1) Further, one kind of Ti and Nb Or, two kinds are included so as to satisfy the following formula (2), and 8.0 ≧ Ti (%) / [4 × C (%) + 3.4 × N (%)] + Nb (%) / [7.7 × C (%) ] ≧ 0.4 ··· (2) and B: 0.0002 to 0.0060%, Mo: 0.0
Steel containing 0 to 0.500% of 1 type or 2 types, the balance being steel composed of iron and unavoidable impurities, and having a ratio of the surface layer portion to the total plate thickness of 2% to 30% on one side Of a surface austenitic stainless multi-layer hot rolled steel sheet excellent in corrosion resistance and deep drawability, characterized by hot rolling a piece at a finishing temperature of less than 920 ° C., and then annealing the hot rolled sheet at 850 to 1250 ° C. Manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14634391A JPH055129A (en) | 1991-06-18 | 1991-06-18 | Production of hot rolled multilayer steel plate having surface layer composed of austenitic stainless steel and excellent in corrosion resistance and deep drawability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14634391A JPH055129A (en) | 1991-06-18 | 1991-06-18 | Production of hot rolled multilayer steel plate having surface layer composed of austenitic stainless steel and excellent in corrosion resistance and deep drawability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH055129A true JPH055129A (en) | 1993-01-14 |
Family
ID=15405560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14634391A Withdrawn JPH055129A (en) | 1991-06-18 | 1991-06-18 | Production of hot rolled multilayer steel plate having surface layer composed of austenitic stainless steel and excellent in corrosion resistance and deep drawability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH055129A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06293976A (en) * | 1993-04-06 | 1994-10-21 | Nippon Steel Corp | Aluminum plated steel sheet excellent in corrosion resistance and workability |
| JPH06293978A (en) * | 1993-04-07 | 1994-10-21 | Nippon Steel Corp | Double layer cold rolled steel sheet for automotive fuel tank excellent in corrosion resistance, deep drawability and soldering property |
| US8137819B2 (en) * | 2006-07-27 | 2012-03-20 | The University Of Tokyo | Multilayer steel and method for producing multilayer steel |
| JP2023510288A (en) * | 2020-01-13 | 2023-03-13 | 宝山鋼鉄股▲分▼有限公司 | Highly corrosion resistant strip steel and its manufacturing method |
-
1991
- 1991-06-18 JP JP14634391A patent/JPH055129A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06293976A (en) * | 1993-04-06 | 1994-10-21 | Nippon Steel Corp | Aluminum plated steel sheet excellent in corrosion resistance and workability |
| JPH06293978A (en) * | 1993-04-07 | 1994-10-21 | Nippon Steel Corp | Double layer cold rolled steel sheet for automotive fuel tank excellent in corrosion resistance, deep drawability and soldering property |
| US8137819B2 (en) * | 2006-07-27 | 2012-03-20 | The University Of Tokyo | Multilayer steel and method for producing multilayer steel |
| JP2023510288A (en) * | 2020-01-13 | 2023-03-13 | 宝山鋼鉄股▲分▼有限公司 | Highly corrosion resistant strip steel and its manufacturing method |
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