JPH08239731A - Cold-rolled steel sheet with excellent surface properties - Google Patents
Cold-rolled steel sheet with excellent surface propertiesInfo
- Publication number
- JPH08239731A JPH08239731A JP4213395A JP4213395A JPH08239731A JP H08239731 A JPH08239731 A JP H08239731A JP 4213395 A JP4213395 A JP 4213395A JP 4213395 A JP4213395 A JP 4213395A JP H08239731 A JPH08239731 A JP H08239731A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- cold
- rolled steel
- composition
- sliver
- 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.)
- Pending
Links
Landscapes
- Heat Treatment Of Sheet Steel (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
(57)【要約】
【目的】 本発明は、スリバー疵が少ない表面性状の良
好な冷延鋼板を提供する。
【構成】 mass％で、Ｃ≦０．０５％、Ｓｉ≦０．２
％、Ｍｎ≦０．５％、酸可溶Ａｌ：０．００１％〜０．
００５％、Ｔｉ：０．０１％〜０．１％で残部Ｆｅおよ
び不可避的不純物元素からなる組成の鋼で、鋼中に含ま
れる非金属介在物の組成が、Ｔｉ：４２％〜５４％、Ａ
ｌ：３％〜１３％、残部Ｏおよび不可避的不純物元素よ
りなることを特徴とした表面性状に優れた冷延鋼板。
【効果】 本発明の冷延鋼板は、スリバー疵発生率が極
めて低く、表面性状に優れており、冷延鋼板の製品歩留
まりも大きく向上した。
(57) [Summary] [Object] The present invention provides a cold-rolled steel sheet having a good surface quality with less sliver flaws. [Composition] Mass%, C ≦ 0.05%, Si ≦ 0.2
%, Mn ≦ 0.5%, acid-soluble Al: 0.001% to 0.
005%, Ti: 0.01% to 0.1%, the balance of Fe and unavoidable impurity elements, and the composition of the nonmetallic inclusions contained in the steel is Ti: 42% to 54%, A
1: Cold-rolled steel sheet having excellent surface properties, characterized by comprising 3% to 13% and the balance O and unavoidable impurity elements. [Effect] The cold rolled steel sheet of the present invention has an extremely low sliver flaw occurrence rate and excellent surface properties, and the product yield of the cold rolled steel sheet is greatly improved.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車、家庭電気製
品、家具、容器等に用いられる優れたプレス成形性で表
面性状に優れた冷延鋼板に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold rolled steel sheet having excellent press formability and excellent surface properties, which is used for automobiles, household appliances, furniture, containers and the like.
【０００２】[0002]
【従来の技術】一般に、冷延鋼板は溶鋼の脱酸のため多
量のＡｌを添加していた。そのため、鋼中の酸可溶Ａｌ
濃度が０．０１〜０．０３mass％（以下単に「％」と記
す。）程度であり、鋼中の非金属介在物の組成はＡｌ2
Ｏ3 が９５％以上である。このＡｌ2 Ｏ3 濃度が高い非
金属介在物は、融点が高く、硬質であるため、熱延時や
冷延時に鋼板表面に露出し、線状の疵が発生する。2. Description of the Related Art Generally, cold-rolled steel sheets are added with a large amount of Al for deoxidizing molten steel. Therefore, acid-soluble Al in steel
The concentration is about 0.01 to 0.03 mass% (hereinafter simply referred to as “%”), and the composition of the nonmetallic inclusions in the steel is Al 2
O 3 is 95% or more. Since this non-metallic inclusion having a high Al 2 O 3 concentration has a high melting point and is hard, it is exposed on the surface of the steel sheet during hot rolling or cold rolling, and linear flaws occur.
【０００３】[0003]
【発明が解決しようとする課題】この線状の疵は一般に
スリバー疵と呼ばれており、自動車、家庭電気製品、家
具、容器等のように美麗な外観が要求される鋼板にはあ
ってはならない欠陥である。そこで、スリバー疵の発生
を抑制することが課題である。そのため、本発明は非金
属介在物を融点が低く、圧延時に変形する組成に制御す
ることを目的とする。This linear flaw is generally called a sliver flaw, and it cannot be applied to steel sheets such as automobiles, household electric appliances, furniture, containers, etc., which require a beautiful appearance. It is a defect that cannot be achieved. Therefore, it is an issue to suppress the occurrence of sliver defects. Therefore, an object of the present invention is to control the composition of the non-metallic inclusion to have a low melting point and to be deformed during rolling.
【０００４】[0004]
【課題を解決するための手段】本発明は、上記の目的を
達成するために、mass％で、Ｃ ≦０．０５％、
Ｓｉ≦０．２％以下、Ｍｎ≦０．５％、
酸可溶Ａｌ：０．００１％〜０．００５％、Ｔｉ：
０．０１％〜０．１％、残部Ｆｅおよび不可避的不純物
元素からなる組成の鋼で、鋼中に含まれる非金属介在物
の組成が、Ｔｉ：４２％〜５４％、 Ａｌ：３％〜
１３％、残部Ｏおよび不可避的不純物元素よりなること
を特徴とした表面性状に優れた冷延鋼板を提供するもの
である。In order to achieve the above-mentioned object, the present invention has a mass% C ≤0.05%,
Si ≦ 0.2% or less, Mn ≦ 0.5%,
Acid-soluble Al: 0.001% to 0.005%, Ti:
Steel having a composition of 0.01% to 0.1%, the balance being Fe and unavoidable impurity elements, and the composition of nonmetallic inclusions contained in the steel is Ti: 42% to 54%, Al: 3% to
The present invention provides a cold-rolled steel sheet having an excellent surface property, which comprises 13%, the balance O and an unavoidable impurity element.
【０００５】[0005]
【作用】本発明の鋼成分をその含有量とともに説明す
る。Ｃは侵入型固溶元素で冷延鋼板の加工性付与に対し
て有害である。従ってその上限を０．０５％とする。Ｓ
ｉは固溶体強化にて鋼を強化するが、一方で加工性を阻
害する。従って、０．２％以下とする。Ｍｎも固溶体強
化によって鋼を強化する。しかし、多過ぎる場合は材料
の延性を減じ、加工性を劣化させる。加工性の劣化を防
止するため上限は０．３％とする。The steel components of the present invention will be described together with their contents. C is an interstitial solid solution element and is harmful to the workability of the cold rolled steel sheet. Therefore, the upper limit is set to 0.05%. S
i strengthens steel by solid solution strengthening, but on the other hand, hinders workability. Therefore, it is set to 0.2% or less. Mn also strengthens steel by solid solution strengthening. However, if too much, the ductility of the material is reduced and the workability is deteriorated. The upper limit is 0.3% to prevent deterioration of workability.
【０００６】以上のようにＣ，Ｓｉ，Ｍｎは冷延鋼板に
求められる加工性を確保するために、含有量の上限を規
定されるが、それと同時に、次に述べる介在物の組成を
制御する上でもその濃度は重要である。ただし、本発明
では、ＡｌとＴｉによって介在物の組成を制御するもの
であり、Ｃ，Ｓｉ，Ｍｎ濃度が上記の範囲であれば、介
在物の組成への影響は無視できる。As described above, the upper limit of the content of C, Si, and Mn is specified in order to secure the workability required for the cold rolled steel sheet, but at the same time, the composition of the inclusions described below is controlled. Above that concentration is also important. However, in the present invention, the composition of the inclusions is controlled by Al and Ti, and if the C, Si, and Mn concentrations are in the above ranges, the influence on the composition of the inclusions can be ignored.
【０００７】ＡｌとＴｉはともに溶鋼の脱酸と介在物の
組成制御のために添加される。Ａｌは溶鋼の脱酸に使用
するが、多過ぎるとＡｌ2 Ｏ3 を主成分とする非金属介
在物が生成され、製品板でのスリバー疵の原因となる。
少なすぎるとＴｉの酸化物を主体とする非金属介在物が
生成される。この非金属介在物も硬質であり、スリバー
疵の原因となる。従って、酸可溶Ａｌ濃度は０．００１
％〜０．００５％とする。Both Al and Ti are added for deoxidizing molten steel and controlling the composition of inclusions. Al is used for deoxidation of molten steel, but if it is too much, nonmetallic inclusions containing Al 2 O 3 as a main component are generated, which causes sliver flaws on the product plate.
If it is too small, non-metallic inclusions mainly composed of Ti oxide are generated. This non-metallic inclusion is also hard and causes sliver flaws. Therefore, the acid-soluble Al concentration is 0.001
% To 0.005%.
【０００８】Ｔｉは脱酸・非金属介在物の組成制御のた
めに添加する。しかし添加量が多過ぎる場合には、非金
属介在物の組成がＴｉ酸化物を主体とする硬質の組成に
なる。一方、少過ぎてもＡｌ2 Ｏ3 を主体とする硬質の
非金属介在物が生成する。従って、Ｔｉの濃度範囲は
０．０１％〜０．１％とする。Ti is added to control the composition of deoxidizing and non-metallic inclusions. However, if the added amount is too large, the composition of the non-metallic inclusions becomes a hard composition mainly composed of Ti oxide. On the other hand, if the amount is too small, hard non-metallic inclusions mainly composed of Al 2 O 3 are formed. Therefore, the Ti concentration range is 0.01% to 0.1%.
【０００９】次に非金属介在物の組成の限定理由を説明
する。本鋼では、ＡｌとＴｉによって脱酸されるため、
鋼中に生成する非金属介在物の主成分はＴｉ，Ａｌ，Ｏ
である。特に、ＴｉとＡｌの濃度によって非金属介在物
の融点が決められる。表面欠陥を低減するためには融点
の低い、いわゆる軟質の非金属介在物を生成することが
重要である。そこで、非金属介在物の融点を下げるため
の最適な組成を検討し、その組成でのスリバー疵の発生
率を比較した。非金属介在物中のＴｉとＡｌの濃度とス
リバー疵の発生率との関係を図１に示す。ここで、スリ
バー疵発生率を鋼板１００ｍ当たりのスリバー疵個数と
定義した。非金属介在物の組成を、図１中に点線で囲ん
だ、Ｔｉ：４２％〜５４％、Ａｌ：３％〜１３％の範囲
とすることによって、スリバー疵発生率を０．１以下の
低位にすることができる。なお、非金属介在物中のＴｉ
とＡｌ以外の成分は主としてＯであり、その他不可避的
不純物元素、例えば、Ｆｅ，Ｓｉ，Ｍｎ，Ｆ，Ｃａ，Ｍ
ｇの全部またはいずれかも含有される。Next, the reasons for limiting the composition of non-metallic inclusions will be described. In this steel, since it is deoxidized by Al and Ti,
The main components of non-metallic inclusions formed in steel are Ti, Al, O
Is. In particular, the melting points of non-metallic inclusions are determined by the concentrations of Ti and Al. In order to reduce surface defects, it is important to generate so-called soft nonmetallic inclusions having a low melting point. Therefore, the optimum composition for lowering the melting point of the non-metallic inclusions was examined, and the occurrence rates of sliver defects in the compositions were compared. FIG. 1 shows the relationship between the concentrations of Ti and Al in the non-metallic inclusions and the occurrence rate of sliver defects. Here, the sliver flaw occurrence rate was defined as the number of sliver flaws per 100 m of the steel sheet. By setting the composition of the non-metallic inclusions to be in the range of Ti: 42% to 54% and Al: 3% to 13% surrounded by a dotted line in FIG. 1, the sliver flaw occurrence rate is as low as 0.1 or less. Can be Note that Ti in non-metallic inclusions
And Al are mainly O, and other unavoidable impurity elements such as Fe, Si, Mn, F, Ca, M
All or any of g is also included.
【００１０】[0010]
【実施例】表１に示す化学成分の鋼を溶製し、連続鋳造
にてスラブとした。これらのスラブを加熱し、４mm厚ま
で熱延した後、０．８mm厚に冷延した。冷延後の鋼板の
表面を目視観察し、スリバー疵の発生率を評価した。併
せて、鋼板の加工特性としてランクフォード値も評価し
た。それらの結果を表２に示す。Example Steels having the chemical composition shown in Table 1 were melted and continuously cast into slabs. These slabs were heated, hot rolled to a thickness of 4 mm, and then cold rolled to a thickness of 0.8 mm. The surface of the steel sheet after cold rolling was visually observed to evaluate the occurrence rate of sliver flaws. At the same time, the Rankford value was also evaluated as a processing characteristic of the steel sheet. Table 2 shows the results.
【００１１】[0011]
【表１】 [Table 1]
【００１２】[0012]
【表２】 [Table 2]
【００１３】本発明鋼であるＮｏ．１〜Ｎｏ．１１は、
スリバー疵発生率が低く、加工特性も良好であるのに対
して、比較鋼のＮｏ．１２〜Ｎｏ．２０は加工特性とス
リバー疵発生率のいずれかまたは両方が悪い。The steel of the present invention No. 1 to No. 11 is
While the sliver flaw occurrence rate is low and the processing characteristics are good, the comparative steel No. 12-No. No. 20 is poor in either or both of the processing characteristics and the sliver flaw occurrence rate.
【００１４】Ｎｏ．１２はＣが高いため、加工性が悪
い。Ｎｏ．１３はＳｉが高いため、加工性が悪い。Ｎ
ｏ．１４はＭｎが高いため加工性が悪い。Ｎｏ．１５は
Ａｌが低いため、非金属介在物の組成がＴｉ酸化物を主
体とする硬質の介在物となり、スリバー疵の発生率が高
い。Ｎｏ．１６はＡｌが高いため、非金属介在物はＡｌ
2Ｏ3 が主体の組成であり、スリバー疵発生率が高い。
Ｎｏ．１７はＴｉが低いため、非金属介在物はＡｌ2 Ｏ
3 が主体の硬質組成であり、スリバー疵発生率が高い。
Ｎｏ．１８はＴｉが高いため、非金属介在物の組成はＴ
ｉ酸化物が主体であり、介在物が硬質であるためスリバ
ー疵発生率が高い。Ｎｏ．１９とＮｏ．２０はいずれも
非金属介在物が硬質の組成であるためスリバー疵発生率
が高い。No. Since No. 12 has a high C, the workability is poor. No. Since No. 13 has a high Si, the workability is poor. N
o. No. 14 has a high Mn and therefore has poor workability. No. Since No. 15 has a low Al content, the composition of the nonmetallic inclusions is a hard inclusion containing Ti oxide as a main component, and the occurrence rate of sliver flaws is high. No. 16 has a high Al content, so the non-metallic inclusions are Al
Since the composition is mainly 2 O 3 , the occurrence rate of sliver defects is high.
No. Since 17 has a low Ti, the non-metallic inclusion is Al 2 O.
3 is the main hard composition and has a high sliver flaw occurrence rate.
No. Since 18 has a high Ti, the composition of the non-metallic inclusions is T
Since the i-oxide is the main component and the inclusions are hard, the sliver flaw occurrence rate is high. No. 19 and No. In No. 20, since the nonmetallic inclusions have a hard composition, the sliver flaw occurrence rate is high.
【００１５】[0015]
【発明の効果】本発明の冷延鋼板は、スリバー疵発生率
が極めて低く、表面性状に優れており、冷延鋼板の製品
歩留まりも大きく向上した。EFFECTS OF THE INVENTION The cold rolled steel sheet of the present invention has an extremely low sliver flaw occurrence rate and excellent surface properties, and the product yield of the cold rolled steel sheet is greatly improved.
【図１】鋼中の非金属介在物中のＴｉとＡｌの濃度とス
リバー疵発生率との関係を示す図である。FIG. 1 is a diagram showing the relationship between the sliver flaw occurrence rate and the concentrations of Ti and Al in non-metallic inclusions in steel.
Claims (1)
で、鋼中に含まれる非金属介在物の組成が、 Ｔｉ：４２％〜５４％、 Ａｌ：３％〜１３％ 残部Ｏおよび不可避的不純物元素よりなることを特徴と
した表面性状に優れた冷延鋼板。1. Mass%, C ≦ 0.05%, Si ≦ 0.2%, Mn ≦ 0.5%, acid-soluble Al: 0.001% to 0.005%, Ti: 0.01 % -0.1% Steel with a composition consisting of balance Fe and inevitable impurity elements, the composition of non-metallic inclusions contained in the steel is: Ti: 42% -54%, Al: 3% -13%, balance O And a cold-rolled steel sheet having excellent surface properties, which is characterized by comprising unavoidable impurity elements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4213395A JPH08239731A (en) | 1995-03-01 | 1995-03-01 | Cold-rolled steel sheet with excellent surface properties |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4213395A JPH08239731A (en) | 1995-03-01 | 1995-03-01 | Cold-rolled steel sheet with excellent surface properties |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08239731A true JPH08239731A (en) | 1996-09-17 |
Family
ID=12627450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4213395A Pending JPH08239731A (en) | 1995-03-01 | 1995-03-01 | Cold-rolled steel sheet with excellent surface properties |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08239731A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6855213B2 (en) | 1998-09-15 | 2005-02-15 | Armco Inc. | Non-ridging ferritic chromium alloyed steel |
| WO2005045083A1 (en) * | 2003-11-05 | 2005-05-19 | Nippon Steel Corporation | Thin steel sheet excelling in surface property, moldability and workability and process for producing the same |
-
1995
- 1995-03-01 JP JP4213395A patent/JPH08239731A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6855213B2 (en) | 1998-09-15 | 2005-02-15 | Armco Inc. | Non-ridging ferritic chromium alloyed steel |
| WO2005045083A1 (en) * | 2003-11-05 | 2005-05-19 | Nippon Steel Corporation | Thin steel sheet excelling in surface property, moldability and workability and process for producing the same |
| US9017492B2 (en) | 2003-11-05 | 2015-04-28 | Nippon Steel & Sumitomo Metal Corporation | Thin gauge steel sheet excellent in surface conditions, formability, and workability and method for producing the same |
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| Date | Code | Title | Description |
|---|---|---|---|
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