JPH0820844A - Ferritic stainless steel sheet excellent in workability and its production - Google Patents

Ferritic stainless steel sheet excellent in workability and its production

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Publication number
JPH0820844A
JPH0820844A JP15383294A JP15383294A JPH0820844A JP H0820844 A JPH0820844 A JP H0820844A JP 15383294 A JP15383294 A JP 15383294A JP 15383294 A JP15383294 A JP 15383294A JP H0820844 A JPH0820844 A JP H0820844A
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JP
Japan
Prior art keywords
workability
rolling
stainless steel
ferritic stainless
steel sheet
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
Application number
JP15383294A
Other languages
Japanese (ja)
Other versions
JP3069495B2 (en
Inventor
Akira Kawarada
昭 川原田
Hiroshi Nomura
寛 野村
Hiroyuki Kakiuchi
博之 垣内
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
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Filing date
Publication date
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP6153832A priority Critical patent/JP3069495B2/en
Publication of JPH0820844A publication Critical patent/JPH0820844A/en
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Publication of JP3069495B2 publication Critical patent/JP3069495B2/en
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Abstract

PURPOSE:To inexpensively produce a ferritic stainless steel excellent in wear resistance and workability while obviating the necessity of large amounts of alloying elements by incorporating specific amounts of C, Cr, Si, Mn, and Fe. CONSTITUTION:A steel, which has a composition consisting of, by weight, 0.07-0.1% C, 16-18% Cr, 0.5-0.75% Si, <=0.3% Mn, and the balance essentially Fe and satisfying Mn/Si <=0.5, is used. After a hot rolled plate is cold-rolled, the resulting sheet is annealed and temper-rolled at 6-15% draft. By regulating Mn content to <=0.3% and further regulating Mn/S to <=0.5, the formation of MnO-SiO2 inclusions extending in a rolling direction can be inhibited and the form of the inclusions can be formed into SiO2 hard to receive adverse effect on workability. By regulating the draft at temper rolling to 6-15%, elongation in the C direction becomes 6-12% and also desired Hv can be obtained.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、フロッピーディスク
センターコア用材料として好適な加工性に優れたフェラ
イト系ステンレス鋼板およびその製造方法に関するもの
である。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ferritic stainless steel sheet having excellent workability, which is suitable as a material for a floppy disk center core, and a method for producing the same.

【0002】[0002]

【従来の技術】フロッピーディスクセンターコアに要求
される特性としては、(1) 耐摩耗性に優れていること、
(2) 磁気特性が良好であること (強磁性体であること)
、(3) プレス成形性に優れていること、(4) 耐食性が
良いことなどが挙げられる。従来、かかるフロッピーデ
ィスクセンターコア用材料としては、一般にSUS43
0のハード仕上げ材が用いられてきた。しかしながら、
この種コアは、その製造過程において苛酷な絞り加工を
強いられるため、上記のSUS430鋼板を用いた場合
には、プレス成形時に図1に示すような圧延方向と直角
な向きの割れがしばしば発生する。
2. Description of the Related Art The characteristics required for a floppy disk center core are (1) excellent wear resistance,
(2) Good magnetic properties (a ferromagnetic material)
, (3) excellent press formability, and (4) good corrosion resistance. Conventionally, as a material for such a floppy disk center core, SUS43 is generally used.
0 hard finishes have been used. However,
Since this type of core is subjected to severe drawing in the manufacturing process, when the above-mentioned SUS430 steel plate is used, cracks in the direction perpendicular to the rolling direction as shown in FIG. 1 often occur during press forming. .

【0003】上記の問題の解決策として、特開昭63-143
87号公報では、鋼組織をフェライト−マルテンサイト2
相組織 (マルテンサイト量:30〜95%) とし、所定の硬
さとして延性の改善を図る方法を提案している。また特
開昭64-19570号公報には、Si, Ni含有量を高くし冷間圧
延−焼鈍処理後のハード圧延の圧下率を軽減することに
よって延性を確保する方法が、さらに特開平3−240936
号公報には、Si, Mn, Cr, Ni含有量を高め、同じく冷間
圧延−焼鈍処理後のハード圧延における圧下率を軽減し
て延性を確保する方法が提案されている。
As a solution to the above problem, Japanese Patent Laid-Open No. 63-143 has been proposed.
No. 87 discloses a steel structure of ferrite-martensite 2
A method has been proposed in which the phase structure (martensite content: 30 to 95%) is used and the ductility is improved with a predetermined hardness. Further, JP-A-64-19570 discloses a method for ensuring ductility by increasing the Si and Ni contents to reduce the reduction rate of hard rolling after cold rolling-annealing treatment. 240936
In the publication, there is proposed a method of increasing the Si, Mn, Cr, and Ni contents and similarly reducing the reduction rate in hard rolling after cold rolling-annealing treatment to secure ductility.

【0004】[0004]

【発明が解決しようとする課題】しかしながら、前者の
鋼組織をフェライト−マルテンサイト2相組織とする方
法では、加工性は改善されるものの、マルテンサイト量
が30〜95%と多いことから、耐食性に劣るという問題が
あった。また、後者のSi, NiさらにはCr等の合金元素を
添加する方法では、高価な合金元素を多量に必要とする
ことからコストの上昇を招くという問題があった。そこ
でこの発明の目的は、上記の問題を有利に解決するもの
で、安価で、SUS430系と同等の耐食性をそなえ、
かつ耐摩耗性、さらには加工性に優れたフェライト系ス
テンレス鋼板を、その有利な製造方法と共に提案するこ
とにある。
However, although the former method in which the steel structure has a ferrite-martensite two-phase structure improves workability, the amount of martensite is as large as 30 to 95%, and therefore corrosion resistance is high. There was a problem that it was inferior to. In addition, the latter method of adding alloy elements such as Si, Ni, and Cr, etc., has a problem in that cost is increased because a large amount of expensive alloy elements are required. Therefore, an object of the present invention is to solve the above-mentioned problems in an advantageous manner, it is inexpensive and has corrosion resistance equivalent to that of SUS430 series.
Moreover, it is to propose a ferritic stainless steel sheet having excellent wear resistance and workability together with its advantageous manufacturing method.

【0005】[0005]

【課題を解決するための手段】フロッピーディスクセン
ターコアには、耐摩耗性の観点からビッカース硬さ(H
v)で 220±10程度の高硬度が要求される。この硬さを
得る手段としては、(1) 合金元素を高め、素材を硬くす
る、(2) 調質圧延の圧下率を高める等の方法がある。し
かしながら、ハード化のために調質圧延の圧下率を高く
すると延性が低下するため、フロッピーディスクセンタ
ーコアのプレス成形時に割れとくに圧延方向と直角な方
向の割れが発生し易くなる。
[Means for Solving the Problems] The floppy disk center core has a Vickers hardness (H
In v), a high hardness of 220 ± 10 is required. As a means for obtaining this hardness, there are methods such as (1) increasing the alloying element to harden the material, and (2) increasing the rolling reduction in temper rolling. However, if the reduction ratio of the temper rolling is increased to make it harder, the ductility decreases, so that cracks, particularly in the direction perpendicular to the rolling direction, are likely to occur during press molding of the floppy disk center core.

【0006】従って、所望の目的を達成するためには、
上記(1), (2)を考慮した合金設計および圧下率設定が重
要である。そこで発明者らは、上記の点を念頭におい
て、新たな素材を開発すべく鋭意研究を進めた結果、Mn
およびSi量ならびにそれらの比を所定の範囲に制限して
やれば、とくに多量の合金元素を必要とせず、また比較
的低圧下率で所望の硬さを確保できることの知見を得
た。この発明は、上記の知見に立脚するものである。
Therefore, in order to achieve the desired purpose,
It is important to design the alloy and set the rolling reduction considering the above (1) and (2). Therefore, with the above points in mind, the inventors have conducted extensive research to develop new materials, and as a result, Mn
It has been found that by limiting the amounts of Si and Si and their ratios within a predetermined range, a particularly large amount of alloying elements is not required and a desired hardness can be secured at a relatively low pressure ratio. The present invention is based on the above findings.

【0007】すなわち、この発明の要旨構成は、以下の
とおりである。 (1) C:0.07〜0.10wt%、 Cr:16〜18wt%を含み、か
つSi:0.50〜0.75wt%、 Mn:0.30wt%以下を、Mn/Si
≦0.50の範囲において含有し, 残部はFeおよび不可避的
不純物からなることを特徴とする加工性に優れたフェラ
イト系ステンレス鋼板。
That is, the gist of the present invention is as follows. (1) C: 0.07 to 0.10 wt%, Cr: 16 to 18 wt%, Si: 0.50 to 0.75 wt%, Mn: 0.30 wt% or less is Mn / Si
Ferritic stainless steel sheet with excellent workability, characterized in that it is contained in the range of ≤0.50, and the balance is Fe and inevitable impurities.

【0008】(2) C:0.07〜0.10wt%、 Cr:16〜18wt
%を含み、かつSi:0.50〜0.75wt%、 Mn:0.30wt%以
下を、Mn/Si≦0.50の範囲において含有し, 残部はFeお
よび不可避的不純物の組成になる熱延板を、冷間圧延し
た後、焼鈍し、ついで圧下率:6〜15%の調質圧延を施
すことを特徴とする加工性に優れたフェライト系ステン
レス鋼板の製造方法。
(2) C: 0.07 to 0.10 wt%, Cr: 16 to 18 wt
%, And Si: 0.50 to 0.75 wt%, Mn: 0.30 wt% or less in the range of Mn / Si ≤ 0.50, the balance being Fe and inevitable impurities. A method for producing a ferritic stainless steel sheet having excellent workability, which comprises rolling, annealing, and temper rolling with a rolling reduction of 6 to 15%.

【0009】[0009]

【作用】この発明において、素材の成分組成および製造
条件を上記の範囲に限定したのは次の理由による。 C:0.07〜0.10wt%;Cは、素材の強化に有効な元素で
あり、含有量が0.07wt%に満たないと機械的強度が十分
ではなく、一方0.10wt%を超えると結晶粒界への炭化物
の析出量が増加し、靱性および耐食性の劣化を招くの
で、0.07〜0.10wt%の範囲に限定した。
In the present invention, the composition of ingredients and the production conditions are limited to the above ranges for the following reasons. C: 0.07 to 0.10 wt%; C is an element effective for strengthening the material, and if the content is less than 0.07 wt%, the mechanical strength is not sufficient, while if it exceeds 0.10 wt%, it becomes a grain boundary. Since the precipitation amount of carbides increases, causing deterioration in toughness and corrosion resistance, the range was limited to 0.07 to 0.10 wt%.

【0010】Cr:16〜18wt% Crは、耐食性の向上に必要な元素である。その効果を得
るには少なくとも16wt%以上が必要であるが、18wt%を
超えると材料のコストアップを招くので、Crの添加量は
16〜18wt%の範囲に限定した。
Cr: 16-18 wt% Cr is an element necessary for improving the corrosion resistance. To obtain this effect, at least 16 wt% or more is required, but if it exceeds 18 wt%, the cost of the material will increase, so the amount of Cr added is
It was limited to the range of 16-18 wt%.

【0011】Si:0.50〜0.75wt%;Siは、強化成分とし
て極めて有効な元素であるが、含有量が0.50wt%に満た
ないと満足いくほどの強度が期待できず、一方、0.75wt
%を超えると材料のコストアップを招く不利があるの
で、Si:0.50〜0.75wt%の範囲に限定した。
Si: 0.50 to 0.75 wt%; Si is an extremely effective element as a strengthening component, but if the content is less than 0.50 wt%, sufficient strength cannot be expected, while 0.75 wt%
%, There is a disadvantage of increasing the cost of the material, so the content of Si is limited to 0.50 to 0.75 wt%.

【0012】Mn:0.30wt%以下;Mnも、Si同様、素材の
強化に有効な元素であるので、この発明では所望の強度
を確保するために、0.30wt%以下(好ましくは0.10〜0.
30wt%)の範囲で含有させるものとした。
Mn: 0.30 wt% or less; Mn, like Si, is an element effective for strengthening the material, so in the present invention, 0.30 wt% or less (preferably 0.10 to 0.
(30 wt%).

【0013】Mn/Si≦ 0.5;ところでMnは、介在物の形
態に重要な役割を果たす元素であるが、この介在物の形
態は加工性に及ぼす影響が殊の外大きく、圧延方向に延
びたA系介在物が存在すると加工性が著しく劣化する。
この点、Mn含有量を0.30wt%以下に抑制した上でMn/S
比を0.50以下とすれば、圧延方向に延びるMnO-SiO2介在
物の生成を抑制され、介在物の形態を加工性に悪影響の
少ないSiO2として加工性の改善を図ることができる。従
って、この発明ではMn, Si量につき、上記の各範囲を満
足した上で、Mn/Si≦0.50を満足する範囲で含有させる
ものとしたのである。
Mn / Si ≦ 0.5; By the way, Mn is an element that plays an important role in the morphology of inclusions, but the morphology of these inclusions has an extremely large effect on workability and extends in the rolling direction. The presence of A-type inclusions significantly deteriorates workability.
In this respect, the Mn content is suppressed to 0.30 wt% or less, and the Mn / S
When the ratio is 0.50 or less, the formation of MnO—SiO 2 inclusions extending in the rolling direction can be suppressed, and the form of the inclusions can be changed to SiO 2 with less adverse effect on the workability to improve the workability. Therefore, in the present invention, the amounts of Mn and Si satisfy the above-mentioned ranges and are contained within the range of Mn / Si ≦ 0.50.

【0014】なお、この発明では、不純物としてP,
S,Cu,Ni,Al,NおよびO等の含有が許されるが、そ
の含有量はそれぞれ、P≦0.040 wt%、S≦0.030 wt
%、Cu≦0.50wt%、Ni≦0.50wt%、Al≦0.150 wt%、N
≦0.050 wt%、O≦0.080 wt%とするのが望ましい。
In the present invention, as impurities, P,
S, Cu, Ni, Al, N, and O are allowed to be contained, but their contents are P ≦ 0.040 wt% and S ≦ 0.030 wt, respectively.
%, Cu ≦ 0.50 wt%, Ni ≦ 0.50 wt%, Al ≦ 0.150 wt%, N
It is desirable that ≦ 0.050 wt% and O ≦ 0.080 wt%.

【0015】・調質圧下率:6〜15%;図2に、上記の
好適組成範囲を満足する鋼板を製造したときの、ハード
化のための調質圧延における圧下率と鋼板のHvとの関係
を、また図3には、HvとC方向伸びとの関係について調
べた結果を従来材と比較して示す。なお、これらの実験
の供試材の化学組成は、本発明材がC:0.08 wt% ,Cr:1
6.22wt%,Si:0.64wt% ,Mn :0.30wt% ,P:0.033 wt%,
S:0.005 wt%,Ni:0.06wt%,Al:0.001 wt%,Mn/Si:0.47
、従来材がC:0.06 wt% ,Cr:16.25wt%,Si:0.32wt%
,Mn :0.65wt% ,P:0.035 wt%, S:0.007 wt%,Ni:0.08
wt%,Al:0.001 wt%,Mn/Si:2.03 であった。図2および
図3から、従来材では、フロッピーディスク・センター
コアとしてその耐摩耗性の点から必要とされるHv : 220
±10を得るには25〜45%の圧下率で圧延しなければなら
ないが、かかる圧下率で得られる鋼板のC方向伸びは
1.0%と極めて小さいことがわかる。これに対し、この
発明材では、所望のHvを得るのに必要な圧下率は6〜15
%であり、このとき得られるC方向伸びは6〜12%にも
達する。
-Quench reduction ratio: 6 to 15%; Fig. 2 shows the reduction ratio and the Hv of the steel plate during temper rolling for hardening when a steel plate satisfying the above-mentioned preferable composition range is manufactured. The relationship, and FIG. 3 shows the results of examining the relationship between Hv and elongation in the C direction in comparison with the conventional material. The chemical compositions of the test materials for these experiments were as follows: C: 0.08 wt%, Cr: 1
6.22wt%, Si: 0.64wt%, Mn: 0.30wt%, P: 0.033wt%,
S: 0.005 wt%, Ni: 0.06 wt%, Al: 0.001 wt%, Mn / Si: 0.47
, C: 0.06 wt%, Cr: 16.25wt%, Si: 0.32wt%
, Mn: 0.65 wt%, P: 0.035 wt%, S: 0.007 wt%, Ni: 0.08
It was wt%, Al: 0.001 wt%, Mn / Si: 2.03. From FIGS. 2 and 3, in the conventional material, Hv: 220 which is required as a floppy disk center core from the viewpoint of its wear resistance.
To obtain ± 10, rolling must be carried out at a reduction rate of 25 to 45%, but the elongation in the C direction of the steel sheet obtained at such a reduction rate is
It can be seen that it is extremely small at 1.0%. On the other hand, in this invention material, the rolling reduction required to obtain the desired Hv is 6 to 15
%, And the elongation in the C direction obtained at this time reaches 6 to 12%.

【0016】このように、この発明材は、軽圧下で所望
のHvが得られ、この時のC方向のElは従来材に較べると
格段に優れているので、過酷なプレス成形時においても
割れの発生を皆無にすることができる。そこで、この発
明では、製造工程中、とくにハード化のための調質圧延
における圧下率を6〜15%の範囲に限定したのである。
As described above, the invention material can obtain a desired Hv under a light pressure, and the El in the C direction at this time is remarkably excellent as compared with the conventional material, so that it cracks even in severe press forming. Can be eliminated. Therefore, in the present invention, the rolling reduction in temper rolling for hardening is limited to the range of 6 to 15% during the manufacturing process.

【0017】その他の、製造条件は、常法に従えば良
く、特に限定されるものではない。
Other manufacturing conditions may be in accordance with ordinary methods and are not particularly limited.

【0018】かくして耐摩耗性および加工性に優れたフ
ェライト系ステンレス鋼板を得ることができるが、この
鋼板は、その用途がフロッピーディスクセンターコア用
材料のみに限られるものではなく、厳しい成形加工を必
要とする用途すべてに適合することは言うまでもない。
Thus, it is possible to obtain a ferritic stainless steel sheet having excellent wear resistance and workability, but this steel sheet is not limited to the use only for floppy disk center core materials, but requires severe forming processing. Needless to say, it is suitable for all uses.

【0019】[0019]

【実施例】表1に示す成分組成になる熱延板を、圧下
率:67%で板厚:0.36mmまで冷間圧延し、ついで780 〜
850℃で焼鈍した後、種々の圧下率でハード化のための
調質圧延を施した。得られた各鋼板の硬さならびにL方
向およびC方向伸びについて調査した結果を表1に併記
する。なお用いた試験片はJIS Z2201 13B
号である。
Example A hot rolled sheet having the composition shown in Table 1 was cold-rolled at a rolling reduction of 67% to a sheet thickness of 0.36 mm, and then 780-
After annealing at 850 ° C, temper rolling for hardening was performed at various reduction ratios. Table 1 also shows the results of the examination of the hardness and the elongation in the L direction and the C direction of each of the obtained steel sheets. The test piece used was JIS Z2201 13B.
No.

【0020】[0020]

【表1】 [Table 1]

【0021】同表から明らかなように、この発明に従い
得られた鋼板はいずれも、Hvが220前後の適正な硬度で
あり、さらにL方向伸びは勿論、C方向伸びについても
6.4%以上の高い値を有している。これに対し、C量が
0.05wt%とこの発明の適正範囲を下回るNo.6は、C方向
伸びは 9.7%と高かったけれども、Hvが 198とやや低
い。また、Mn量が多く従ってMn/Si比が0.67と適正範囲
の上限を上回るNo.8は、Hvは 223と良好であったが、C
方向伸びが 3.6%と低い。さらに、C量が多く、またMn
量が多く従ってMn/Si比が高いNo.9, 10, 11はいずれ
も、適正なHvがが得られていないだけでなく、C方向伸
びも 1.5〜2.0 %と極めて低い。
As is clear from the table, all of the steel sheets obtained according to the present invention have an appropriate hardness of Hv of about 220, and further, not only the elongation in the L direction but also the elongation in the C direction.
It has a high value of 6.4% or more. On the other hand, the amount of C
No. 6, which is less than the proper range of this invention at 0.05 wt%, had a high C-direction elongation of 9.7%, but had a slightly low Hv of 198. Further, No. 8 having a large amount of Mn and thus having an Mn / Si ratio of 0.67, which exceeds the upper limit of the appropriate range, had a good Hv of 223, but C
Directional elongation is low at 3.6%. Furthermore, the amount of C is large, and Mn
Nos. 9, 10 and 11 having a large amount and therefore a high Mn / Si ratio are not only able to obtain an appropriate Hv, but also have an elongation in the C direction of 1.5 to 2.0%, which is extremely low.

【0022】[0022]

【発明の効果】かくしてこの発明によれば、多量の合金
元素を必要とすることなく安価に、耐摩耗性および加工
性に優れたフェライト系ステンレス鋼を得ることがで
き、特にフロッピーディスクセンターコア用材料として
偉効を奏する。
As described above, according to the present invention, it is possible to inexpensively obtain a ferritic stainless steel excellent in wear resistance and workability without requiring a large amount of alloying elements, and particularly for a floppy disk center core. It has a great effect as a material.

【図面の簡単な説明】[Brief description of drawings]

【図1】フロッピーディスクセンターコアにおける割れ
の発生状況を示す図である。
FIG. 1 is a diagram showing a state of occurrence of cracks in a floppy disk center core.

【図2】調質圧延圧下率とHvとの関係を示すグラフであ
る。
FIG. 2 is a graph showing the relationship between the temper rolling reduction and Hv.

【図3】HvとC方向伸びとの関係を示すグラフである。FIG. 3 is a graph showing the relationship between Hv and elongation in the C direction.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】C:0.07〜0.10wt%、 Cr:16〜18wt%を
含み、かつSi:0.50〜0.75wt%、 Mn:0.30wt%以下
を、 Mn/Si≦0.50の範囲において含有し, 残部はFeおよび不
可避的不純物からなることを特徴とする加工性に優れた
フェライト系ステンレス鋼板。
1. C: 0.07 to 0.10 wt%, Cr: 16 to 18 wt%, Si: 0.50 to 0.75 wt%, Mn: 0.30 wt% or less in the range of Mn / Si ≤ 0.50, The balance is Fe and inevitable impurities, and is a ferritic stainless steel sheet with excellent workability.
【請求項2】C:0.07〜0.10wt%、 Cr:16〜18wt%を
含み、かつSi:0.50〜0.75wt%、 Mn:0.30wt%以下
を、 Mn/Si≦0.50の範囲において含有し, 残部はFeおよび不
可避的不純物の組成になる熱延板を、冷間圧延した後、
焼鈍し、ついで圧下率:6〜15%の調質圧延を施すこと
を特徴とする加工性に優れたフェライト系ステンレス鋼
板の製造方法。
2. C: 0.07 to 0.10 wt%, Cr: 16 to 18 wt%, Si: 0.50 to 0.75 wt%, Mn: 0.30 wt% or less in the range of Mn / Si ≦ 0.50, The balance is Fe and the composition of unavoidable impurities, hot-rolled sheet, after cold rolling,
A method for producing a ferritic stainless steel sheet having excellent workability, which comprises performing annealing and then temper rolling at a rolling reduction of 6 to 15%.
JP6153832A 1994-07-05 1994-07-05 Ferritic stainless steel sheet excellent in workability and method for producing the same Expired - Fee Related JP3069495B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100431435B1 (en) * 1999-09-17 2004-05-14 주식회사 포스코 Method for Preventing Surface Cracks of Ferritic Stainless Steel During Hot Rolling Process
JP2017534761A (en) * 2014-10-22 2017-11-24 ポスコPosco High strength, high ductility ferritic stainless steel sheet and method for producing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100431435B1 (en) * 1999-09-17 2004-05-14 주식회사 포스코 Method for Preventing Surface Cracks of Ferritic Stainless Steel During Hot Rolling Process
JP2017534761A (en) * 2014-10-22 2017-11-24 ポスコPosco High strength, high ductility ferritic stainless steel sheet and method for producing the same

Also Published As

Publication number Publication date
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