JP2001181787A - Surface treated steel sheet for deep drawing, excellent in pin holing resistance - Google Patents

Surface treated steel sheet for deep drawing, excellent in pin holing resistance

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Publication number
JP2001181787A
JP2001181787A JP2000391107A JP2000391107A JP2001181787A JP 2001181787 A JP2001181787 A JP 2001181787A JP 2000391107 A JP2000391107 A JP 2000391107A JP 2000391107 A JP2000391107 A JP 2000391107A JP 2001181787 A JP2001181787 A JP 2001181787A
Authority
JP
Japan
Prior art keywords
steel sheet
resistance
treated steel
deep drawing
less
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
JP2000391107A
Other languages
Japanese (ja)
Other versions
JP3440079B2 (en
Inventor
Shigeo Kurokawa
重男 黒川
Kazuo Mochizuki
一雄 望月
Toshiyuki Kato
俊之 加藤
Shigeru Usuda
茂 薄田
Satoru Sano
哲 佐野
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
Mitsubishi Motors Corp
Original Assignee
Mitsubishi Motors Corp
Kawasaki Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Motors Corp, Kawasaki Steel Corp filed Critical Mitsubishi Motors Corp
Priority to JP2000391107A priority Critical patent/JP3440079B2/en
Publication of JP2001181787A publication Critical patent/JP2001181787A/en
Application granted granted Critical
Publication of JP3440079B2 publication Critical patent/JP3440079B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide a surface treated steel sheet for deep drawing, free from deterioration in press workability and recyclability and excellent in pin holing resistance. SOLUTION: This steel sheet has a composition which consists of, by weight, <=0.005% C, <=0.05% Si, <=0.3% Mn, 0.01-0.05% P, 0.001-0.015% S, <=0.05% Al, 0.001-0.06% Sb, 0.005-0.15% of one or more elements selected from Ti, Nb and B, and the balance Fe with inevitable impurities and in which P and S satisfy the relation of P (wt.%)/S(wt.%)>=5.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】この発明は、自動車の外板パ
ネル等の使途に適した深絞り用材料に関し、特にプレス
加工性のほか、耐孔あき性に優れる冷延鋼板の表面に亜
鉛系のめっき層を施してなる表面処理鋼板に関するもの
である。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deep drawing material suitable for use as an outer panel of an automobile and the like, and more particularly to a zinc-based material which is formed on a cold-rolled steel sheet having excellent press workability and excellent perforation resistance. The present invention relates to a surface-treated steel sheet provided with a plating layer.

【0002】[0002]

【従来の技術】従来、自動車外板などのように良好な成
形性が要求される部位に用いられる鋼板としては、鋼中
C量を0.005 wt%程度の微少量に低減し、かつTi, Nbお
よびBなどの炭化物成形元素を添加して鋼中Cを固定
し、これによって、プレス加工性を向上させた極低炭素
鋼板が一般に使用されることが多くなってきている。こ
のように極低炭素鋼板の使用量が増大した理由は、鋼板
自身が優れた成形特性を有していることのほか、特に最
近の極低炭素鋼の溶製技術の進歩と相まって、材質上の
制約から極低炭素鋼板を使用せざるを得ない連続焼鈍法
が普及したことなどの製造技術の進歩が挙げられる。一
方、耐食性が要求される部位に用いられる鋼板として
は、Cu, Ni, Pを添加した耐候性鋼板が一般的であり、
例えば、特公平5−30899 号公報には極低炭素鋼にCu,
Pを添加してリン酸塩化成処理性を向上させた鋼板が開
示されている。また、特公平1−53344 号公報には成形
性の優れた高耐食性鋼板が開示されている。
2. Description of the Related Art Conventionally, as a steel sheet used for a part where good formability is required, such as an automobile outer panel, the C content in steel is reduced to a very small amount of about 0.005 wt%, and Ti, Nb Ultra-low carbon steel sheets which add C and B and other carbide forming elements to fix C in the steel and thereby improve the press workability have been increasingly used in general. The reason for the increase in the use of ultra-low carbon steel sheets in this way is that, in addition to the excellent forming properties of the steel sheets themselves, especially in conjunction with recent advances in smelting technology for ultra-low carbon steels, Due to the restrictions on the use of ultra-low carbon steel sheets, the continuous annealing method has become widespread. On the other hand, as a steel sheet used for a part where corrosion resistance is required, a weather-resistant steel sheet to which Cu, Ni, and P are added is generally used.
For example, Japanese Patent Publication No. 5-30899 discloses that extremely low carbon steel is made of Cu,
A steel sheet in which P is added to improve the phosphatization treatment property is disclosed. Japanese Patent Publication No. 1-53344 discloses a high corrosion-resistant steel sheet having excellent formability.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、上記従
来技術のうち、特公平5−30899 号公報に開示のもの
は、リン酸塩処理性は改善されているものの、耐孔あき
性は満足できる状態にはない。特にS含有量の高い組成
例ではこの傾向が顕著である。また、上記従来技術の特
公平1−53344 号公報は、Cr含有量が高いため、リン酸
塩化成処理性が悪く、塗装を施して使用される自動車用
鋼板としては不適当である。さらに、これらの従来技術
はいずれも、CuやCrなど高価な元素を多量に添加する必
要があるため、鋼板自体が高価である。また、CuやCrを
含有するとスクラップから除去することが困難となりリ
サイクル時に不利である。
However, among the above-mentioned prior arts, the one disclosed in Japanese Patent Publication No. 5-30899 has improved phosphatability but satisfactory pitting resistance. Not in This tendency is particularly remarkable in a composition example having a high S content. Further, Japanese Patent Publication No. 1-53344 of the above-mentioned prior art has a high Cr content and therefore has poor phosphate chemical treatment properties, and is unsuitable as a coated steel sheet for automobiles. Further, in each of these conventional techniques, since a large amount of expensive elements such as Cu and Cr must be added, the steel sheet itself is expensive. Further, if Cu or Cr is contained, it is difficult to remove it from scrap, which is disadvantageous at the time of recycling.

【0004】本発明の目的は、従来技術が抱えているこ
のような問題点に鑑み、プレス加工性やリサイクル性を
害することなく、耐孔あき性を改善した亜鉛系のめっき
層を施してなる表面処理鋼板を提供することにある。
An object of the present invention is to provide a zinc-based plating layer having improved perforation resistance without impairing press workability and recyclability, in view of such problems of the prior art. An object of the present invention is to provide a surface-treated steel sheet.

【0005】[0005]

【課題を解決するための手段】本発明者らは、上掲の目
的を実現すべく実験, 検討を重ねた結果、極低炭素鋼板
のS含有量を一定量以下に下げると共に、PをS含有量
の5倍以上添加すること、また、さらにSbを添加するこ
とによって、加工性を損なわずに耐孔あき性を、従来の
極低炭素鋼板よりも格段に向上させ得ることを見い出
し、この発明を完成するに至った。その要旨構成は下記
のとおりである。
The inventors of the present invention have conducted experiments and studies to achieve the above object, and as a result, have reduced the S content of the ultra-low carbon steel sheet to a certain level or less, and reduced P to S. By adding more than 5 times the content, and by further adding Sb, it has been found that the puncture resistance can be significantly improved compared to the conventional ultra-low carbon steel sheet without impairing the workability. The invention has been completed. The summary structure is as follows.

【0006】(1) C≦0.005 wt%、Si≦0.05wt%、Mn≦
0.3 wt%、P:0.01〜0.05wt%、S:0.001 〜0.01wt
%、Al≦0.05wt%、Sb:0.001 〜0.06wt%を含有し、か
つTi, NbおよびBのうちから選ばれる1種または2種以
上を0.005 〜0.15wt%の範囲内で含有し、しかもPとS
とはその比P(wt%)/S(wt%) が5以上を満足するように
含有し、残部がFeおよび不可避的不純物よりなる鋼板の
少なくとも片面に亜鉛系のめっき層(電気めっき層また
は溶融めっき層)を形成してなることを特徴とする耐孔
あき性に優れる深絞り用表面処理鋼板。
(1) C ≦ 0.005 wt%, Si ≦ 0.05 wt%, Mn ≦
0.3 wt%, P: 0.01-0.05 wt%, S: 0.001-0.01 wt
%, Al ≦ 0.05 wt%, Sb: 0.001 to 0.06 wt%, and one or more selected from Ti, Nb and B in the range of 0.005 to 0.15 wt%, and P and S
Means that the ratio P (wt%) / S (wt%) is contained to satisfy 5 or more, and the balance is at least one side of a steel plate composed of Fe and unavoidable impurities. A hot-dip surface-treated steel sheet with excellent puncture resistance, characterized by forming a hot-dip layer.

【0007】[0007]

【発明の実施の形態】本発明は、自動車外板などに供す
る深絞り用表面処理鋼板であり、鋼板自身のプレス加工
性, すなわち深絞り性を確保した上で、耐孔あき性を付
与することが必要であるという考え方に基づいて開発し
たものである。発明者らは、このような考え方に基づ
き、特にSの量およびSとPの量的な関係(P(wt%)/S
(wt%) ) に着目した。すなわち、これらの関係を適正範
囲内に制御すれば、高価な添加元素を使うまでもなく、
優れた深絞り性(プレス加工性)のほか、耐孔あき性が
実現されることを知見した。
BEST MODE FOR CARRYING OUT THE INVENTION The present invention is a surface-treated steel sheet for deep drawing to be used for an outer panel of an automobile, etc., which imparts perforation resistance while ensuring the press workability of the steel sheet itself, that is, the deep drawability. It was developed based on the concept that it is necessary. Based on such a concept, the inventors have found that, in particular, the amount of S and the quantitative relationship between S and P (P (wt%) / S
(wt%)). In other words, if these relationships are controlled within an appropriate range, without using expensive additional elements,
In addition to excellent deep drawability (press workability), it was found that perforation resistance was realized.

【0008】以下に、本発明において、P(wt%)/S(wt
%) の比に着目した理由について説明する。Sは、硫化
物を形成し錆の起点を多くしたり、生成錆を粗雑にして
耐食性を劣化させる元素であり極力少なくする必要があ
るが、脱S技術にも限界があり費用もかかるので、実用
的には0.001 wt%が下限である。そこで、この条件下で
も耐食性の劣化を抑制するべく鋭意研究した結果、Pを
Sの5倍以上添加するとSの悪影響を打ち消すことがで
きることがわかった。この理由は、生成する錆層が非常
に緻密になり、強固に鋼板表面に付着するため、錆層が
バリヤーとなり腐食促進物質(水, 酸素, 塩など)の侵
入を防ぐものと考えられる。
Hereinafter, in the present invention, P (wt%) / S (wt
The reason for focusing on the ratio of (%) will be described. S is an element that forms sulfides to increase the starting point of rust or to coarsen the generated rust to deteriorate the corrosion resistance, and it is necessary to reduce it as much as possible. Practically, the lower limit is 0.001 wt%. Therefore, as a result of intensive studies to suppress the deterioration of corrosion resistance even under these conditions, it was found that the adverse effect of S can be counteracted by adding P five times or more of S. It is considered that the reason for this is that the rust layer formed becomes very dense and adheres firmly to the steel sheet surface, so that the rust layer acts as a barrier and prevents the penetration of corrosion promoting substances (water, oxygen, salts, etc.).

【0009】次に、各成分の組成を限定した理由を以下
に説明する。 C:0.005 wt%以下 Cは、優れたプレス加工性(絞り加工性)を得るために
は、できるだけ少なくする必要があり、0.005 wt%以下
に規制するが、0.003 wt%以下にすることが好ましい。
Next, the reasons for limiting the composition of each component will be described below. C: 0.005 wt% or less C must be reduced as much as possible in order to obtain excellent press workability (drawing workability), and is regulated to 0.005 wt% or less, but is preferably 0.003 wt% or less. .

【0010】Si:0.05wt%以下、Mn:0.3 wt%以下 SiおよびMnは、製鋼上必要な成分であるが、あまり多量
に含まれると加工性の劣化を招くので、Siは0.05wt%以
下、好ましくは0.03wt%以下とし、一方、Mnは0.3 wt%
以下、好ましくは 0.2wt%以下に規制する。
[0010] Si: 0.05 wt% or less, Mn: 0.3 wt% or less Si and Mn are necessary components for steelmaking, but if contained in a large amount, the workability is deteriorated. , Preferably 0.03 wt% or less, while Mn is 0.3 wt%
Or less, preferably 0.2 wt% or less.

【0011】P:0.01〜0.05wt% Pは、耐孔あき性を向上させる元素であって、上述した
ように、PとSとの重量比P(wt%)/S(wt%) は5以上に
なるように成分調整をすることが必要である。このこと
に加えて、本発明では、このPの含有量が0.05wt%を超
えると、脆性が劣化する。一方、0.01wt%未満では耐孔
あき性の向上に効果が認められない。なお、好ましい範
囲は0.02〜0.05wt%である。
P: 0.01 to 0.05 wt% P is an element for improving the puncture resistance. As described above, the weight ratio of P to S, P (wt%) / S (wt%), is 5%. It is necessary to adjust the components as described above. In addition to this, in the present invention, if the content of P exceeds 0.05 wt%, the brittleness deteriorates. On the other hand, if it is less than 0.01 wt%, no effect is observed in improving the puncture resistance. The preferred range is 0.02 to 0.05 wt%.

【0012】S:0.001 〜0.01wt% Sは、耐孔あき性を劣化させるため、少ない方が好まし
い。すなわち、このSが0.01wt%を超えると、Pの必要
添加量が増し、偏析等の問題が生じると共に、その改善
のためには高価なCuやNiなどの添加が必要となるので、
上限を0.01wt%とした。しかしながら、このSを下げす
ぎても効果の向上にはつながらないばかりでなく、脱S
に要する費用が嵩み経済的に不利になるので、下限を0.
001 wt%とした。
S: 0.001 to 0.01 wt% Since S deteriorates the perforation resistance, it is preferable that S is small. That is, if this S exceeds 0.01 wt%, the required amount of P increases, causing problems such as segregation and the like. In order to improve the problem, it is necessary to add expensive Cu or Ni.
The upper limit was made 0.01 wt%. However, lowering this S too much does not only lead to an improvement in the effect, but also reduces the S
Cost is high and economically disadvantageous, so the lower limit is 0.
001 wt%.

【0013】Al:0.05wt%以下 Alは、脱酸剤として鋼の清浄化に必要な元素であるが、
一方で鋼の耐食性を劣化させるので、上限を0.05wt%に
規制した。
Al: 0.05 wt% or less Al is an element necessary for cleaning steel as a deoxidizing agent.
On the other hand, the corrosion resistance of steel deteriorates, so the upper limit was restricted to 0.05 wt%.

【0014】Ti, Nb, B:合計で0.005 〜0.15wt% これらの成分はいずれも炭化物形成元素であって、鋼中
のCを炭化物として固定し、これによって優れた絞り性
を得るために必要な元素である。これらの成分が合計で
0.005 wt%未満では上述の効果が得られず、一方、0.15
wt%を超えて添加してもそれ以上効果は向上せず、逆に
絞り成形性を劣化させてしまう。したがって、Ti, Nb,
Bの添加は合計で0.005 〜0.15wt%の範囲内とした。な
お、これらはいずれか1種のみを単独で添加しても良
い。好ましい範囲は0.01〜0.1 wt%である。
Ti, Nb, B: 0.005 to 0.15 wt% in total These components are all carbide forming elements and are necessary for fixing C in steel as carbide and thereby obtaining excellent drawability. Element. These components in total
At less than 0.005 wt%, the above effects cannot be obtained.
Even if it is added in excess of wt%, the effect is not further improved, and conversely, the drawability is deteriorated. Therefore, Ti, Nb,
B was added in a total range of 0.005 to 0.15 wt%. In addition, only one of these may be added alone. The preferred range is 0.01-0.1 wt%.

【0015】Sb:0.001 〜0.06wt% Sbは、焼鈍時にSiやMnが鋼板表面に濃化するのを抑制す
る効果を有する。その効果は、添加量が0.001 wt%未満
ではあらわれず、また0.06wt%を超えてもさらなる効果
が発揮されず、経済的に不利となる。したがって、Sbの
添加は0.001 〜0.06wt%とする。なお、好ましい範囲は
0.002 〜0.02wt%である。
Sb: 0.001 to 0.06 wt% Sb has the effect of suppressing the concentration of Si and Mn on the steel sheet surface during annealing. The effect does not appear if the added amount is less than 0.001 wt%, and if it exceeds 0.06 wt%, no further effect is exhibited, which is economically disadvantageous. Therefore, the addition of Sb is made 0.001 to 0.06 wt%. The preferred range is
0.002 to 0.02 wt%.

【0016】上述した成分組成の鋼板は、転炉等で溶製
したスラブを直接又は加熱後、熱間圧延し、酸洗、冷間
圧延および焼鈍の各工程を経る一般的な工程により製造
される。各工程の製造条件はとくに定める必要はなく、
常法にしたがって行えばよい。また、このようにして製
造した鋼板への亜鉛系めっき層の形成は、鋼板の少なく
とも一方の面に、電気めっき(10〜60g/m2程
度)または溶融めっき(30〜90g/m2程度)する
ことによって得られ、それらの製造条件もとくに定める
必要はなく、常法にしたがって行えばよい。
A steel sheet having the above-mentioned composition is manufactured by a general process of hot rolling the slab melted in a converter or the like, followed by hot rolling, pickling, cold rolling and annealing. You. The manufacturing conditions for each process do not need to be specified,
What is necessary is just to carry out according to a conventional method. Further, the formation of the zinc-based plating layer on the steel sheet manufactured in this way is performed by electroplating (about 10 to 60 g / m2) or hot-dip plating (about 30 to 90 g / m2) on at least one surface of the steel sheet. The production conditions do not need to be particularly defined, and may be performed according to a conventional method.

【0017】[0017]

【実施例】表1に示す成分組成の鋼を、真空溶解により
溶製してスラブとし、1250℃に加熱して仕上温度 910℃
となるように熱間圧延して板厚3.5 mmの熱延板としたの
ち空冷した。次に、この熱延板を80℃の10%塩酸中で酸
洗して鋼板表面のスケールを除去した後、0.7 mmの板厚
にまで冷間圧延した。引き続き、電解脱脂により表面に
付着した圧延油を除去した後、5 %水素の窒素雰囲気(
露点−30℃) 中にて800 ℃に加熱して1分間保持し、そ
の後窒素ガス雰囲気にて30℃/sec.で冷却する焼鈍を行
い、供試鋼板を作製した。また、上記方法で製造した鋼
板の両面に溶融亜鉛めっき、合金化溶融亜鉛めっき、電
気亜鉛めっきおよびZn−12%Ni電気めっきのいずれかの
めっきを施し、表面処理鋼板を作製した。
EXAMPLE A steel having the composition shown in Table 1 was melted by vacuum melting to form a slab, which was heated to 1250 ° C and finished at a temperature of 910 ° C.
After hot-rolling to obtain a hot-rolled sheet having a thickness of 3.5 mm, the sheet was air-cooled. Next, the hot-rolled sheet was pickled in 10% hydrochloric acid at 80 ° C. to remove scale on the surface of the steel sheet, and then cold-rolled to a sheet thickness of 0.7 mm. Then, after removing the rolling oil adhering to the surface by electrolytic degreasing, the atmosphere of nitrogen in 5% hydrogen (
(Dew point −30 ° C.), heated to 800 ° C. and maintained for 1 minute, and then annealed by cooling at 30 ° C./sec in a nitrogen gas atmosphere to produce a test steel sheet. In addition, both surfaces of the steel sheet manufactured by the above method were subjected to any one of hot-dip galvanizing, alloyed hot-dip galvanizing, electrogalvanizing, and Zn-12% Ni electroplating to produce a surface-treated steel sheet.

【0018】[0018]

【表1】 [Table 1]

【0019】上記の各表面処理鋼板について、耐孔あき
性の試験を行って、本発明の作用効果を確認した。ま
た、各鋼板にプレス加工性の試験を行った。 a.耐孔あき性については、各供試材を裸(無処理)の
状態で沖縄の海岸に18ヶ月曝露し、錆を除去した後の板
厚減少値(mm)を測定して評価した。亜鉛系のめっき
を施した鋼板については、リン酸塩化成処理(パルボン
ドPB−3020)後、塗膜厚20μmの電着塗装(パ
ワートップ U−52)を施し、次いで砂利を4気圧で
エアーショットし、塗膜面を傷つけた後、複合サイクル
腐食試験機で塩水噴霧(5%NaCl,35℃)6時
間、次いで乾燥(50℃、相対湿度20%以下)3時
間、さらに湿潤(50℃、相対湿度95%以上)15時
間の1日1サイクルの条件で50サイクル腐食させ、腐
食部の錆を除去したあとの板厚減少値(mm)を測定し
て評価した。 b.プレス加工性については、エリクセン社の深絞り試
験機を用いて限界絞り比(LDR=絞り抜け可の最大ブ
ランク径/ポンチ径)を測定して評価した。その評価基
準は次のとおりである。 LDR 1.8 未満 = × 1.8 〜2.0 未満 = △ 2.0 〜2.2 未満 = ○ 2.2 以上 = ◎ 測定条件は、ポンチ径:33mmφとし、しわ押さえ力:50
0 kgとし、通常の防錆油を塗油した状態で試験した。
Each of the above surface-treated steel sheets was subjected to a test for resistance to puncturing to confirm the effects of the present invention. In addition, a press workability test was performed on each steel sheet. a. The puncture resistance was evaluated by exposing each test material in a bare (untreated) state to the coast of Okinawa for 18 months, and measuring the thickness reduction (mm) after removing rust. For the zinc-plated steel sheet, after phosphate conversion treatment (Palbond PB-3020), electrodeposition coating (Powertop U-52) with a coating thickness of 20 μm is applied, and then gravel is air-shot at 4 atm. After the coating film surface was damaged, it was sprayed with salt water (5% NaCl, 35 ° C.) for 6 hours, then dried (50 ° C., relative humidity 20% or less) for 3 hours and further wet (50 ° C., Corrosion was performed 50 times under the condition of one cycle per day for 15 hours (relative humidity: 95% or more), and the sheet thickness reduction value (mm) after removing the rust in the corroded portion was measured and evaluated. b. The press workability was evaluated by measuring the limit drawing ratio (LDR = maximum blank diameter allowing punching / punch diameter) using an Erichsen deep drawing tester. The evaluation criteria are as follows. LDR less than 1.8 = × less than 1.8 to less than 2.0 = △ less than 2.0 to less than 2.2 = ○ 2.2 or more = ◎ Measurement conditions: punch diameter: 33 mmφ, wrinkle holding force: 50
The test was performed in a state where the weight was set to 0 kg and a normal rust preventive oil was applied.

【0020】得られた試験結果を表1に併せて示す。上
掲の表1に示す結果から明らかなように、本発明に従う
表面処理鋼板(No.17 )は、耐孔あき性およびプレス加
工性のいずれも良好な特性を示した。これに対し、比較
例の場合は、これらの特性のいずれか少なくとも1つが
悪く、いずれも改善の必要性があった。
The test results obtained are shown in Table 1. As is evident from the results shown in Table 1 above, the surface-treated steel sheet (No. 17) according to the present invention exhibited good properties in both the puncture resistance and the press workability. On the other hand, in the case of the comparative example, at least one of these characteristics was bad, and there was a need for improvement in all of them.

【0021】[0021]

【発明の効果】以上説明したように、この発明の表面処
理鋼板は、プレス加工性のほか、耐孔あき性に優れてい
る。従って、自動車用の鋼板のように絞り加工が施され
て用いられる用途材として特に有利である。また、Cuや
Crを含有していないため、リサイクルに有利となる。
As described above, the surface-treated steel sheet of the present invention is excellent in not only press workability but also perforation resistance. Therefore, it is particularly advantageous as an application material used after being subjected to drawing processing, such as a steel plate for automobiles. Also, Cu and
Since it does not contain Cr, it is advantageous for recycling.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 望月 一雄 千葉県千葉市中央区川崎町1番地 川崎製 鉄株式会社技術研究所内 (72)発明者 加藤 俊之 千葉県千葉市中央区川崎町1番地 川崎製 鉄株式会社技術研究所内 (72)発明者 薄田 茂 東京都港区芝5丁目33番8号 三菱自動車 工業株式会社内 (72)発明者 佐野 哲 東京都港区芝5丁目33番8号 三菱自動車 工業株式会社内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuo Mochizuki, 1st Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Prefecture Inside the Technical Research Institute of Kawasaki Steel Co., Ltd. (72) Toshiyuki Kato 1-1-1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Inside Steel Technology Co., Ltd. (72) Inventor Shigeru Usada 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation (72) Inventor Satoshi Sano 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Automotive Industry Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】C≦0.005 wt%、 Si≦0.05wt%、 Mn≦0.3 wt%、 P:0.01〜0.05wt%、 S:0.001 〜0.01wt%、Al≦0.05wt%、 Sb:0.001 〜0.06wt%を含有し、かつTi, NbおよびBの
うちから選ばれる1種または2種以上を0.005 〜0.15wt
%の範囲内で含有し、しかもPとSとはその比P(wt%)/
S(wt%) が5以上を満足するように含有し、残部がFeお
よび不可避的不純物よりなる鋼板の少なくとも片面に亜
鉛系のめっき層を形成してなることを特徴とする耐孔あ
き性に優れる深絞り用表面処理鋼板。
1. C ≦ 0.005 wt%, Si ≦ 0.05 wt%, Mn ≦ 0.3 wt%, P: 0.01 to 0.05 wt%, S: 0.001 to 0.01 wt%, Al ≦ 0.05 wt%, Sb: 0.001 to 0.06 %, and one or more selected from Ti, Nb and B in an amount of 0.005 to 0.15 wt.
%, And the ratio of P and S is P (wt%) /
S (wt%) is contained so as to satisfy 5 or more, and the balance is formed by forming a zinc-based plating layer on at least one surface of a steel plate consisting of Fe and unavoidable impurities. Excellent surface-treated steel sheet for deep drawing.
JP2000391107A 1994-11-21 2000-12-22 Surface-treated steel sheet for deep drawing with excellent perforation resistance Expired - Fee Related JP3440079B2 (en)

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JP28649194 1994-11-21
JP6-286491 1994-11-21
JP2000391107A JP3440079B2 (en) 1994-11-21 2000-12-22 Surface-treated steel sheet for deep drawing with excellent perforation resistance

Related Parent Applications (1)

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JP28378995A Division JP3229921B2 (en) 1994-11-21 1995-10-31 Steel sheet for deep drawing and surface-treated steel sheet with excellent perforation resistance

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JP2001181787A true JP2001181787A (en) 2001-07-03
JP3440079B2 JP3440079B2 (en) 2003-08-25

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