JPH0718403A - Galvannealed steel sheet excellent in press formability - Google Patents
Galvannealed steel sheet excellent in press formabilityInfo
- Publication number
- JPH0718403A JPH0718403A JP18670693A JP18670693A JPH0718403A JP H0718403 A JPH0718403 A JP H0718403A JP 18670693 A JP18670693 A JP 18670693A JP 18670693 A JP18670693 A JP 18670693A JP H0718403 A JPH0718403 A JP H0718403A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- press
- recesses
- press formability
- galvannealed steel
- 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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- Coating With Molten Metal (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、プレス成形性に優れ
た合金化溶融亜鉛めっき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 galvannealed steel sheet having excellent press formability.
【０００２】[0002]
【従来の技術】合金化溶融亜鉛めっき鋼板は、塗装性、
溶接性および耐食性に優れることから自動車、家電製品
および鋼製家具の外板等に広く用いられている。また、
更なる防錆強化の必要性から厚目付け合金化溶融亜鉛め
っき鋼板が用いられるようになった。2. Description of the Related Art Alloyed hot-dip galvanized steel sheets are
Due to its excellent weldability and corrosion resistance, it is widely used for automobiles, home appliances and outer panels of steel furniture. Also,
Due to the need for further rust prevention strengthening, thick-weight alloyed hot-dip galvanized steel sheets have come to be used.
【０００３】しかしながら、合金化溶融亜鉛めっき鋼板
は、熱拡散により合金化処理を行うために、目付け量が
多くなるに従って、めっき皮膜中の鉄濃度勾配が大きく
なる。このために、めっき皮膜と下地鋼板との界面に
は、Ｆe 濃度が高く脆いΓ相が生成され、反対に、めっ
き皮膜の表層付近には、Ｆe 濃度の低いζ相が生成され
た皮膜構造となりやすい。Γ相が厚いとプレス加工時に
おいて脆いΓ相が破壊されて、めっき皮膜が粉状に剥離
するパウダリングが発生する。一方、ζ相がめっき皮膜
の表面に存在していると、ζ相は比較的低融点であるた
めに、プレス加工時に金型とζ相とが凝着を起こして、
摺動抵抗が大きくなり、型かじりやプレス割れが発生す
るといった問題があった。However, since the alloyed hot-dip galvanized steel sheet is alloyed by thermal diffusion, the iron concentration gradient in the plating film increases as the basis weight increases. For this reason, a brittle Γ phase with a high Fe concentration is generated at the interface between the plating film and the base steel sheet, and conversely, a ζ phase with a low Fe concentration is generated near the surface layer of the plating film. Cheap. If the Γ phase is thick, the brittle Γ phase is destroyed during press working, and powdering occurs in which the plating film is separated into powder. On the other hand, if the ζ phase exists on the surface of the plating film, the ζ phase has a relatively low melting point, so that the die and the ζ phase cause adhesion during press working,
There was a problem that sliding resistance was increased, and galling and press cracking occurred.
【０００４】従来、合金化溶融亜鉛めっき鋼板のプレス
成形性を向上させる手段として、合金化溶融亜鉛めっき
鋼板の表面に各種高粘度の防錆油や固体系潤滑材を塗布
する方法が知られている。以下、従来技術１という。Conventionally, as a means for improving the press formability of the galvannealed steel sheet, there has been known a method of applying various high-viscosity rust preventive oils or solid lubricants to the surface of the galvannealed steel sheet. There is. Hereinafter, it will be referred to as Prior Art 1.
【０００５】別の手段として、特開平１−３１９６６１
号公開公報には、比較的硬いめっき皮膜、例えば、鉄系
または鉄族系の合金めっき等を合金化亜鉛めっき層の上
層に被覆する方法が開示され、特開平３−２４３７５５
号公開公報には、有機皮膜を合金化亜鉛めっき層の上層
に被覆する方法が開示され、特開平２−１９０４８３号
公開公報には、合金化亜鉛めっき層の表面に酸化膜を形
成する方法が開示されている。以下、従来技術２とい
う。As another means, Japanese Patent Laid-Open No. 1-319661
Japanese Patent Laid-Open Publication No. 3-243755 discloses a method of coating a relatively hard plating film, for example, an iron-based or iron-group-based alloy plating on the alloyed zinc plating layer.
Japanese Unexamined Patent Publication (Kokai) Publication No. Hei 2-190483 discloses a method of forming an oxide film on the surface of an alloyed zinc plating layer. It is disclosed. Hereinafter, it will be referred to as Prior Art 2.
【０００６】合金化溶融亜鉛めっき鋼板の表面粗さを調
整してプレス成形性を向上させる方法として、特開平２
−２７４８５９号公開公報には、レーザー加工によって
所望の表面粗さが付与されたレーザーダルロールによっ
て表面粗さを調整する方法が開示されている。以下、従
来技術３という。As a method for improving the press formability by adjusting the surface roughness of the galvannealed steel sheet, there is disclosed in Japanese Patent Laid-Open Publication No. HEI-2.
JP-A-274859 discloses a method of adjusting the surface roughness with a laser dull roll provided with a desired surface roughness by laser processing. Hereinafter, it is referred to as Prior Art 3.
【０００７】更に、特開平２−５７６７０号公開公報に
は、めっき原板の表面粗さを１．０μｍＲａ以下、めっ
き層の表面粗さをＰＰＩ（カットオフ値１．２５μｍ）
２５０以上に維持した、プレス成形性に優れた合金化溶
融亜鉛めっき鋼板が開示されている。以下、従来技術４
という。Further, in Japanese Laid-Open Patent Publication No. 2-57670, the surface roughness of the original plating plate is 1.0 μmRa or less, and the surface roughness of the plating layer is PPI (cutoff value 1.25 μm).
An alloyed hot-dip galvanized steel sheet excellent in press formability maintained at 250 or more is disclosed. Hereinafter, conventional technology 4
Say.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、従来技
術１は、以下のような問題を有している。即ち、各種の
高粘度の防錆油や固定系潤滑剤の脱脂性が劣るため、従
来よりも脱脂しにくく、脱脂剤である有機溶剤によって
プレス作業場の環境が悪化する。However, the prior art 1 has the following problems. That is, the degreasing properties of various high-viscosity rust preventive oils and fixed lubricants are inferior, so that it is more difficult to degrease than before, and the environment of the press workshop is deteriorated by the organic solvent that is the degreasing agent.
【０００９】従来技術２は、コスト高になる上、作業性
や生産性が悪いといった問題を有している。Prior art 2 has the problems of high cost and poor workability and productivity.
【００１０】従来技術３は、以下のような問題を有して
いる。 １つの凹部の面積が５００〜１００００μｍ2 と比
較的大きいことから、凹部に溜まったプレス油の保持性
が悪く、プレス油が凹部から流れ出しやすい。従って、
プレス工程における鋼板搬送時において、プレス油が流
れ落ちて、プレス成形性が低下する。Prior art 3 has the following problems. Since the area of one recess is relatively large, 500 to 10000 μm 2 , the holding property of the press oil accumulated in the recess is poor, and the press oil easily flows out from the recess. Therefore,
When the steel sheet is conveyed in the pressing step, the press oil flows down and the press formability deteriorates.
【００１１】 凹部の最接近間隔が５０〜３００μｍ
と比較的広いので、凹部におけるプレス油の保持による
プレス成形性の向上に限界がある。即ち、たとえ、凹部
にプレス油が保持されても、凹部から凹部までの平坦部
の長さが長いために、プレス時にダイが平坦部を通過す
る間に油切れが生じ、急激な摩擦係数の上昇によるミク
ロな焼き付きが発生して、型かじりやプレス割れが生じ
る。The closest distance between the recesses is 50 to 300 μm
Since it is relatively wide, there is a limit to the improvement of press formability by holding the press oil in the recess. That is, even if the press oil is retained in the recesses, the length of the flat portion from recess to recess is long, so that oil runs out while the die passes through the flat portions during pressing, resulting in a sudden friction coefficient. Micro-seizure occurs due to rising, resulting in mold galling and press cracking.
【００１２】 合金化溶融亜鉛めっき鋼板を製造後、
レーザーダルロールによって鋼板に調質圧延を行ってめ
っき鋼板表面に所定の凹凸を付与すると、調質圧延の際
に、めっき皮膜は、大きな変形を受けるので、めっき皮
膜が剥離しやすい。After manufacturing the galvannealed steel sheet,
When temper rolling is performed on a steel sheet by a laser dull roll to give predetermined unevenness to the surface of the plated steel sheet, the plating film undergoes large deformation during temper rolling, so that the plating film is easily peeled off.
【００１３】 レーザーによってロール表面にダル加
工を施すには、多大なコストがかかり、しかも、ロール
表面に形成された凹凸の損耗が激しいので、ロールを頻
繁に交換する必要がある。Dulling the roll surface with a laser requires a great deal of cost, and since the unevenness formed on the roll surface is heavily worn, it is necessary to frequently replace the roll.
【００１４】従来技術４は、以下のような問題を有して
いる。 表面粗さが１．０μｍＲａ以下の鋼板をめっき原板
として用いることは、めっき浴中において、ドロスの鋼
板面への付着を促進することになり、ドロスによる欠陥
防止の点で不利である。即ち、ダル仕上げ冷延鋼板を用
いる場合には、鋼板がめっき浴中のロールと接触する際
に、鋼板とロールとが密着する面積が小さいこと、およ
び、鋼板面とロール面との隙間が大きいことから、ドロ
スは、鋼板面に圧着されず、ガスワイピング時にめっき
浴中に還流する。このため、ドロス欠陥は生じない。一
方、表面粗さが１．０μｍＲａ以下の鋼板を用いる場合
には、鋼板がめっき浴中のロールと接触する際に、鋼板
とロールとが密着する面積が大きいこと、および、鋼板
面とロール面との隙間が小さいことから、ドロスは、鋼
板面に圧着されてドロス欠陥が生じる。Prior art 4 has the following problems. The use of a steel plate having a surface roughness of 1.0 μmRa or less as a plating original plate promotes adhesion of dross to the steel plate surface in the plating bath, which is disadvantageous in preventing defects due to dross. That is, when using a dull finish cold-rolled steel sheet, when the steel sheet comes into contact with the roll in the plating bath, the area where the steel sheet and the roll are in close contact is small, and the gap between the steel sheet surface and the roll surface is large. Therefore, the dross is not pressure-bonded to the surface of the steel sheet, but is refluxed in the plating bath during gas wiping. Therefore, no dross defect occurs. On the other hand, in the case of using a steel plate having a surface roughness of 1.0 μmRa or less, when the steel plate comes into contact with the roll in the plating bath, the contact area between the steel plate and the roll is large, and the steel plate surface and the roll surface Since the gap between the dross is small, the dross is pressure-bonded to the surface of the steel plate to cause dross defects.
【００１５】 従来技術４は、めっき層の合金化過程
において、めっき層自体の合金化反応によって、高いＰ
ＰＩをめっき皮膜に付与するものであるが、ただ単にＰ
ＰＩが高いだけでは、自己潤滑効果において不十分であ
る上に、保持されるプレス油の量が少ないために、プレ
ス成形時にダイがめっき皮膜の表面を進行する間に油切
れとなり、急激な摩擦係数の上昇によるミクロな焼付け
が発生し、型かじりやプレス割れが生じる。The prior art 4 has a high P due to the alloying reaction of the plating layer itself in the alloying process of the plating layer.
PI is added to the plating film, but simply P
A high PI alone is not sufficient for the self-lubricating effect, and because the amount of press oil retained is small, oil runs out during press forming while the die progresses over the surface of the plating film, causing rapid friction. Micro-baking occurs due to the increase in the coefficient, which causes galling and press cracking.
【００１６】従って、この発明の目的は、優れたプレス
成形性を有し、しかも、めっき皮膜が剥離しにくい耐パ
ウダリング性に優れた合金化溶融亜鉛めっき鋼板を提供
することにある。Accordingly, it is an object of the present invention to provide an alloyed hot-dip galvanized steel sheet which has excellent press formability and which is excellent in powdering resistance in which the plating film is less likely to peel off.
【００１７】[0017]
【課題を解決するための手段】この発明は、下記条件、 深さ：２μｍ以上、 個数：２００〜８２００個／ｍｍ2 、 面積率（単位面積当たりの凹部の開口面積が占める割
合）：１０〜７０％ を満足する凹部が表面に形成されていることに特徴を有
するものである。Means for Solving the Problems The present invention has the following conditions: depth: 2 μm or more; number: 200 to 8200 pieces / mm 2 ; area ratio (ratio of the opening area of recesses per unit area): 10 The feature is that a concave portion satisfying 70% is formed on the surface.
【００１８】[0018]
【作用】次に、この発明の、プレス成形性に優れた合金
化溶融亜鉛めっき鋼板を、図面を参照しながらを詳細に
説明する。Next, the galvannealed steel sheet excellent in press formability of the present invention will be described in detail with reference to the drawings.
【００１９】一般に、プレス加工時のプレス割れは、鋼
板の金型への流入抵抗が鋼板の破断限界を超えたときに
発生する。鋼板の総合的な流入抵抗は、鋼板の曲げ、曲
げ戻しの変形抵抗と摩擦成分により成り立っている。従
って、流入抵抗低減のためには、鋼板表面の摩擦抵抗を
下げることが有効である。プレス加工時の摩擦は、金型
と鋼板表面とが接触して滑る際に発生し、金型と鋼板と
の直接接触による凝着が発生した場合に摩擦抵抗は増大
する。Generally, press cracking during press working occurs when the inflow resistance of the steel sheet into the mold exceeds the fracture limit of the steel sheet. The total inflow resistance of the steel sheet is composed of the bending resistance of the steel sheet, the deformation resistance of bending back, and the friction component. Therefore, in order to reduce the inflow resistance, it is effective to reduce the frictional resistance on the surface of the steel sheet. Friction during press working occurs when the die and the surface of the steel sheet slide due to contact with each other, and frictional resistance increases when adhesion occurs due to direct contact between the die and the steel sheet.
【００２０】通常、プレス加工時には、金型と鋼板との
接触界面にプレス油による油膜を形成させて摩擦力の増
大を防止している。しかしながら、金型と鋼板との接触
面圧が高い場合には、油膜が破壊されて金型と鋼板との
直接接触が生じて摩擦抵抗は増大する。このような状況
下において、摩擦抵抗の増大を抑制するには、油膜の保
持能力が重要である。Normally, during press working, an oil film of press oil is formed at the contact interface between the die and the steel plate to prevent an increase in frictional force. However, when the contact surface pressure between the die and the steel sheet is high, the oil film is broken and direct contact between the die and the steel sheet occurs, and the frictional resistance increases. Under such circumstances, the oil film retaining ability is important for suppressing an increase in frictional resistance.
【００２１】このようなことから、この発明において
は、鋼板表面に、下記条件、 深さ：２μｍ以上、 個数：２００〜８２００個／ｍｍ2 、 面積率（単位面積当たりの凹部の開口面積が占める割
合）：１０〜７０％ を満足する凹部を形成することによって、前記凹部内に
プレス油を有効に保持させ、これによって、金型と鋼板
との接触界面にプレス油のミクロプールを独立して形成
させる。From the above, according to the present invention, the surface of the steel sheet has the following conditions: depth: 2 μm or more; number: 200 to 8200 pieces / mm 2 ; area ratio (opening area of recesses per unit area occupies Ratio): 10 to 70% of the recesses are formed to effectively retain the press oil in the recesses, thereby independently forming a micropool of the press oil at the contact interface between the die and the steel plate. Let it form.
【００２２】このように、ミクロプール内に封じ込まれ
たプレス油は、金型と鋼板との接触面圧が高い場合で
も、面圧の一部を受けるので、金型と鋼板との直接接触
は起こらず、良好なプレス成形性が得られる。As described above, the press oil enclosed in the micropool receives a part of the surface pressure even when the contact surface pressure between the die and the steel sheet is high, so that the die and the steel sheet directly contact each other. Does not occur and good press formability can be obtained.
【００２３】次に、この発明における数値の限定理由に
ついて説明する。Next, the reason for limiting the numerical values in the present invention will be described.
【００２４】凹部の深さを２μｍ以上に限定したのは、
凹部の深さが２μｍ未満であると、プレス油を十分に保
持することができるミクロプールを形成することができ
ないからである。The reason why the depth of the recess is limited to 2 μm or more is that
This is because if the depth of the recesses is less than 2 μm, it is impossible to form a micropool that can sufficiently hold the press oil.
【００２５】凹部の数を２００〜８２００個／ｍｍ2 の
範囲内に限定したのは、凹部の数が２００個／ｍｍ2 未
満であると、凹部の最接近間隔が広すぎて、たとえ、凹
部にプレス油が保持されても、凹部から凹部までの平坦
部の長さが長いために、プレス時にダイが平坦部を通過
する間に油切れが生じ、急激な摩擦係数の上昇によるミ
クロな焼き付きが発生し、しかも、１つの凹部の受ける
面圧が大きすぎるために、油膜が破壊されて、型かじり
やプレス割れが生じ、一方、凹部をその数が８２００個
／ｍｍ2 を超えるように鋼板表面に形成することは、プ
レス成形性および塗装後鮮映性に悪影響を及ぼさないも
のの技術的に困難であり、現実的でないからである。The number of recesses is limited to the range of 200 to 8200 / mm 2 because when the number of recesses is less than 200 / mm 2 , the closest distance between the recesses is too wide, and Even if the press oil is retained on the plate, the length of the flat part from recess to recess is long, so oil runs out while the die passes through the flat part during pressing, causing a microscopic seizure due to a sharp increase in the friction coefficient. Occurs, and because the surface pressure received by one recess is too large, the oil film is destroyed, causing galling and press cracking, while the number of recesses exceeds 8200 / mm 2. It is because it is technically difficult to form it on the surface although it does not adversely affect the press moldability and the image clarity after coating, and it is not realistic.
【００２６】単位面積当たりの凹部の開口面積が占める
割合、即ち、面性率が１０％未満であると、凹部内に保
持されるプレス油の量が不足するために、プレス時にダ
イが平坦部を進行する間に油切れが生じること、およ
び、保持されるプレス油の量が不足して面圧に抗するに
十分な静水圧が得られないこと、等の理由によって油膜
が破壊されて、型かじりやプレス割れが生じ、一方、７
０％を超えると、凹部以外の部分、即ち、山部分が細く
なってこれが脱落する恐れがあるからである。If the ratio of the opening area of the concave portion per unit area, that is, the surface area ratio is less than 10%, the amount of the press oil retained in the concave portion is insufficient, so that the die is flat on pressing. The oil film is destroyed due to such reasons as running out of oil, and that the amount of press oil retained is insufficient to obtain sufficient hydrostatic pressure to withstand the surface pressure. Mold galling and press cracking occurred, while 7
This is because if it exceeds 0%, the portion other than the concave portion, that is, the mountain portion, becomes thin and there is a risk that it may fall off.
【００２７】この発明の、プレス成形性に優れた合金化
溶融亜鉛めっき鋼板においては、上述した条件を満足す
るとともに、相対負荷長さｔp （８０％）が９０％以下
の条件を満足すれば、プレス成形性を更に向上させるこ
とができる。In the alloyed hot-dip galvanized steel sheet excellent in press formability of the present invention, if the above conditions are satisfied and the relative load length t p (80%) is 90% or less, The press moldability can be further improved.
【００２８】以下、この請求項２にかかる発明について
図面を参照しながら説明する。図１は、この発明のカッ
トオフ値が０．８ｍｍの表面粗さ曲線のプロフィルを示
す図である。図１において、１は、カットオフ値が０．
８ｍｍの表面粗さ曲線の測定長さ（Ｌ）の平均線であ
る。２は、平均線１に平行で最高山頂レベルの直線、３
は、平均線に平行で最低谷底レベルの直線、４は、平均
線１に平行で、最高山頂を０％、最低谷底を１００％と
したときのレベル８０％にある直線、そして、ｌ1 、ｌ
2 、ｌ3 、ｌ4 、ｌ5 は、測定長さ（Ｌ）の中で平均線
１に平行で、且つ、直線４によって切断される表面の切
断部分の各々の長さである。ここで、カットオフ値が
０．８ｍｍの粗さ曲線の測定長さ（Ｌ）に間において、
平均線１に平行で、且つ、最高山頂から、最高山頂を０
％、最低谷底１００％としたときの百分率で表した切断
レベル８０％にある直線で切断される長さを、測定長さ
（Ｌ）に対する百分率で表した相対負荷長さｔp （８０
％）は、下記数１によって表わされる。The invention according to claim 2 will be described below with reference to the drawings. FIG. 1 is a diagram showing a profile of a surface roughness curve having a cutoff value of 0.8 mm according to the present invention. In FIG. 1, 1 has a cutoff value of 0.
It is the average line of the measured length (L) of the surface roughness curve of 8 mm. 2 is a straight line parallel to the average line 1 and at the highest peak level, 3
Is a straight line that is parallel to the average line and has the lowest valley bottom level, 4 is a line that is parallel to the average line 1, and is at a level of 80% when the highest peak is 0% and the lowest valley bottom is 100%, and l 1 , l
2, l 3, l 4, l 5 is parallel to the mean line 1 in the measuring length (L), and a length of each of the cut portion of the surface to be cut by the straight line 4. Here, between the measurement length (L) of the roughness curve having a cutoff value of 0.8 mm,
Parallel to the mean line 1 and from the highest peak to 0
%, The length cut by a straight line at a cutting level of 80% expressed as a percentage when the lowest valley bottom is 100%, the relative load length t p (80) expressed as a percentage with respect to the measurement length (L).
%) Is represented by the following formula 1.
【００２９】[0029]
【数１】ｔp （８０％）＝（ｌ1 ＋ｌ2 ＋ｌ3 ＋ｌ4 ＋
ｌ5 ）／Ｌ×１００（％）[Number 1] t p (80%) = ( l 1 + l 2 + l 3 + l 4 +
l 5 ) / L × 100 (%)
【００３０】相対負荷長さｔp （８０％）は、上述した
請求項１にかかる発明における凹部の油溜まりの大きさ
と対応しており、この値を９０％以下に維持することに
よって、十分な量のプレス油を凹部に保持させることが
でき、これによって、より一層のプレス成形性の向上が
認められる。The relative load length t p (80%) corresponds to the size of the oil sump in the recess in the invention according to claim 1 described above, and it is sufficient to maintain this value at 90% or less. A certain amount of press oil can be retained in the recesses, whereby further improvement in press formability is recognized.
【００３１】図２は、この発明の、プレス成形性に優れ
た合金化溶融亜鉛めっき鋼板の断面の一例を示す模式図
である。図２において、５は、下地鋼板、そして、６
は、下地鋼板５上に形成されためっき皮膜である。めっ
き皮膜６に形成された凹部の最大深さは、最大めっき皮
膜厚以下であり、局部的にめっき皮膜が薄くなっている
ものの、下地鋼板５が露出した部分はなく、優れたプレ
ス成形性および耐食性を有している。FIG. 2 is a schematic view showing an example of a cross section of an alloyed hot-dip galvanized steel sheet excellent in press formability according to the present invention. In FIG. 2, 5 is a base steel plate, and 6
Is a plating film formed on the base steel sheet 5. The maximum depth of the recess formed in the plating film 6 is less than or equal to the maximum plating film thickness, and although the plating film is locally thin, there is no exposed portion of the base steel sheet 5, and excellent press formability and Has corrosion resistance.
【００３２】図３は、この発明の、プレス成形性に優れ
た合金化溶融亜鉛めっき鋼板表面の走査型電子顕微鏡写
真の一例である。図４は、従来の合金化溶融亜鉛めっき
鋼板表面の走査型電子顕微鏡写真の一例である。図３お
よび図４から明らかなように、この発明の合金化溶融亜
鉛めっき鋼板は、従来の合金化溶融亜鉛めっき鋼板には
存在しない凹部が表面に形成されており、凹部の深さ、
個数、および、凹部の面積率は、何れも、本願発明の範
囲を満足している。FIG. 3 is an example of a scanning electron microscope photograph of the surface of the galvannealed steel sheet having excellent press formability according to the present invention. FIG. 4 is an example of a scanning electron micrograph of the surface of a conventional galvannealed steel sheet. As is clear from FIGS. 3 and 4, the alloyed hot-dip galvanized steel sheet of the present invention has recesses formed on the surface, which are not present in conventional alloyed hot-dip galvanized steel sheets.
Both the number and the area ratio of the recesses satisfy the range of the present invention.
【００３３】[0033]
【実施例】次に、この発明を実施例によって更に詳細に
説明する。 実施例１ 板厚０．８ｍｍの冷延鋼板を下地鋼板として、連続溶融
亜鉛めっきライン（ＣＧＬ）により、めっき付着量を片
面当たり６０ｇ／ｍ2 に調整した種々の合金化溶融亜鉛
めっき鋼板を製造した。鋼板をＣＧＬに通板する際に、
鋼板を焼鈍後、０．１７ｗｔ％のＡｌを含有する亜鉛浴
中においてめっきを施し、次いで、合金化炉において５
１０℃の温度下で合金化処理を施すことによって亜鉛め
っき鋼板の表面に微小凹部を形成した。１ｍｍ2 中の凹
部の数は、結晶粒の大きさを変えた鋼板を下地鋼板とし
て用いることによって変化させた。ここで、結晶粒の大
きさは、下地鋼板の成分および焼鈍条件を変えることに
よって調整することができる。また、結晶粒の大きさを
調整と材質が変化する可能性があるが、材質を変化させ
たくない場合には、鋼板をＣＧＬに通板する際に、ＣＧ
Ｌ焼鈍炉の中で焼鈍再結晶前に鋼板表面に歪を導入した
後、焼鈍を行えばよい。これによって、鋼板最表層のみ
の結晶粒の大きさが調整され、且つ、内層の結晶粒の大
きさを一定に維持できるので、材質が均一で且つ表層の
結晶粒の大きさを変えた鋼板を製造することができる。
凹部の数の測定法は、後述する。EXAMPLES Next, the present invention will be described in more detail by way of examples. Example 1 A cold-rolled steel sheet having a thickness of 0.8 mm was used as a base steel sheet, and various alloyed hot-dip galvanized steel sheets were produced by a continuous hot-dip galvanizing line (CGL) with the coating weight adjusted to 60 g / m 2 per side. did. When passing a steel plate through CGL,
After annealing the steel plate, it is plated in a zinc bath containing 0.17 wt% Al, then 5 in an alloying furnace.
By applying an alloying treatment at a temperature of 10 ° C., minute recesses were formed on the surface of the galvanized steel sheet. The number of recesses in 1 mm 2 was changed by using a steel plate having a different crystal grain size as a base steel plate. Here, the size of the crystal grains can be adjusted by changing the components of the base steel sheet and the annealing conditions. Also, the material may change when the size of the crystal grains is adjusted, but if the material is not desired to be changed, when the steel sheet is passed through the CGL, the CG
In an L annealing furnace, annealing may be performed after introducing strain on the surface of the steel sheet before annealing recrystallization. With this, the size of the crystal grains of only the outermost surface layer of the steel sheet is adjusted, and the size of the crystal grains of the inner layer can be maintained constant, so that a steel sheet having a uniform material and a different size of the crystal grains of the surface layer can be prepared. It can be manufactured.
The method for measuring the number of recesses will be described later.
【００３４】このようにして製造した合金化溶融亜鉛め
っき鋼板の各々から試験片Ｎｏ．４〜１５を切り出し
て、以下に説明する種々の試験に供した。そして、比較
のために、従来技術３の鋼板から比較試験片Ｎｏ．１〜
３を切り出し、従来技術４の鋼板から比較試験片Ｎｏ．
１６を切り出して、同様な試験に供した。From each of the alloyed hot-dip galvanized steel sheets produced in this manner, test piece No. 4 to 15 were cut out and subjected to various tests described below. Then, for comparison, from the steel sheet of Conventional Technique 3, the comparative test piece No. 1 to
No. 3 was cut out, and the comparative test piece No.
16 pieces were cut out and subjected to the same test.
【００３５】凹部の数は、試験片の表面を走査型電子顕
微鏡により観察し、１００倍写真における２５ｍｍ2 中
の凹部の数を測定し、１ｍｍ2 の数に換算することによ
って測定した。The number of recesses was measured by observing the surface of the test piece with a scanning electron microscope, measuring the number of recesses in 25 mm 2 in a 100 × photograph, and converting the number into 1 mm 2 .
【００３６】プレス成形性を評価する、鋼板表面の摩擦
係数は、図５に示す摩擦係数測定装置を用いて測定し
た。このとき用いたビード７は、材質がＳＫＤ１１で、
接触面積が３ｍｍ×１０ｍｍのものであった。試験片８
をローラー１０上の試験台９に固定し、押付け荷重Ｎ＝
４００Ｋｇ、引抜き速度１ｍ／分で試験台１０をレール
１３に沿って引き抜き、ビード７を試験片８に押し付け
た状態でロードセル１１および１２によって測定され
る、引抜き荷重Ｆと押付け荷重Ｎとから試験片８の摩擦
係数Ｆ／Ｎを算出した。このとき使用した潤滑油は、日
本パーカライジング（株）製「ノックスラスト５３０
Ｆ」であり、これを試験片８の表面に塗布した。摩擦係
数の評価は、０．１５０未満が良好、０．１５０以上が
極めて良好である。The friction coefficient of the surface of the steel plate for evaluating the press formability was measured using the friction coefficient measuring device shown in FIG. The bead 7 used at this time is made of SKD11,
The contact area was 3 mm × 10 mm. Test piece 8
Is fixed to the test stand 9 on the roller 10, and the pressing load N =
The test piece was pulled out along the rail 13 at a pulling rate of 1 m / min at 400 kg and the bead 7 was pressed against the test piece 8, and the load cell 11 and 12 measured the pull-out load F and the pressing load N to measure the test piece. The friction coefficient F / N of 8 was calculated. The lubricating oil used at this time was "NOXLAST 530" manufactured by Nippon Parkerizing Co., Ltd.
F ", which was applied to the surface of the test piece 8. Regarding the evaluation of the friction coefficient, less than 0.150 is good, and 0.150 or more is extremely good.
【００３７】めっき皮膜の剥離性の指標となる耐パウダ
リング性は、図６に示すドロービード試験機によるドロ
ービードテストによって、次のようにして評価した。先
ず、３０ｍｍ幅×１２０ｍｍ長さの試験片１４の非測定
対象面のめっき皮膜を希塩酸によって溶解剥離した。次
いで、この試験片１４を脱脂し、その重量を測定した。
次いで、試験片１４を、ドロービード試験機のビード１
５とダイ１６との間に装着し、油圧装置１７によって圧
力Ｐ＝５００Ｋｇでダイ１６を試験片１４を介してビー
ド１５に押し付けた。押付け圧力Ｐは、ロードセル１８
によって測定した。次に、このようにビード１５とダイ
１６との間に挟まれた試験片１４を、引抜き速度Ｖ＝２
００ｍｍ／分で、上方に引き抜いた。このとき使用した
潤滑油は、日本パーカライジング（株）製「ノックスラ
スト５３０Ｆ」であり、これを試験片１４の表面に塗布
した。次いで、試験片１７を脱脂し、測定対象面にテー
プを張り付け、これを剥離し、再度、脱脂し、次いで、
重量を測定し、試験前後での重量差からパウダリング量
を求めた。そして、パウダリング量が５ｇ／ｍ2 未満の
ものを耐パウダリング性が「良好」と評価し、パウダリ
ング量が５ｇ／ｍ2以上のものを耐パウダリング性が
「劣る」と評価した。The powdering resistance, which is an index of the peelability of the plating film, was evaluated as follows by a draw bead test using a draw bead tester shown in FIG. First, the plating film on the non-measurement target surface of the test piece 14 having a width of 30 mm and a length of 120 mm was dissolved and peeled off with diluted hydrochloric acid. Next, the test piece 14 was degreased and its weight was measured.
Then, the test piece 14 is attached to the bead 1 of the draw bead tester.
5 was mounted between the die 5 and the die 16, and the die 16 was pressed against the bead 15 via the test piece 14 at a pressure P = 500 Kg by the hydraulic device 17. The pressing pressure P is the load cell 18
Measured by Next, the test piece 14 thus sandwiched between the bead 15 and the die 16 is pulled out at a speed V = 2.
It was pulled out upwards at 00 mm / min. The lubricating oil used at this time was “Knoxlast 530F” manufactured by Nippon Parkerizing Co., Ltd., and this was applied to the surface of the test piece 14. Next, the test piece 17 is degreased, a tape is attached to the surface to be measured, this is peeled off, degreasing is performed again, and then,
The weight was measured, and the amount of powdering was determined from the weight difference before and after the test. Then, the powdering resistance of less than 5 g / m 2 was evaluated as “good” and the powdering resistance of 5 g / m 2 or more was evaluated as “poor”.
【００３８】以上の試験結果を、表１に併せて示す。The above test results are also shown in Table 1.
【００３９】[0039]
【表１】 [Table 1]
【００４０】表１から明らかなように、比較試験片Ｎo.
１〜３は、凹部の数が本発明範囲を外れて少ない。従っ
て、摩擦係数が本発明試験片に比べて大きいので、プレ
ス成形性に劣っている。しかも、比較試験片Ｎo.１〜３
は、合金化溶融亜鉛めっき鋼板を、表面粗さを調整した
ダルロールによって調質圧延することによって製造され
ているので、調質圧延時にめっき皮膜が損傷を受けてい
る。従って、めっき皮膜が剥離しやすく、耐パウダリン
ング性に劣っている。As is apparent from Table 1, the comparative test piece No.
In Nos. 1 to 3, the number of concave portions is out of the range of the present invention and is small. Therefore, since the friction coefficient is larger than that of the test piece of the present invention, the press formability is poor. Moreover, comparative test pieces No. 1-3
Is manufactured by temper rolling an alloyed hot-dip galvanized steel sheet with a dull roll whose surface roughness is adjusted, so that the plating film is damaged during temper rolling. Therefore, the plating film is easily peeled off and the powdering resistance is poor.
【００４１】比較試験片Ｎo.１１は、凹部の面積率が本
発明範囲を外れて大きいので、摩擦係数は小さいが耐パ
ウダリング性に劣っている。In the comparative test piece No. 11, the area ratio of the recesses is out of the range of the present invention and is large, so that the friction coefficient is small but the powdering resistance is poor.
【００４２】比較試験片Ｎo.１５、１６は、何れも、凹
部の面積率が本発明範囲を外れて小さいので、摩擦係数
が本発明試験片に比べて大きい。従って、プレス成形性
に劣っている。In each of the comparative test pieces No. 15 and 16, since the area ratio of the recesses is small outside the range of the present invention, the friction coefficient is larger than that of the test piece of the present invention. Therefore, the press formability is poor.
【００４３】これに対して、本発明試験片Ｎo.４〜１０
および１２〜１４は、何れも、プレス成形性および耐パ
ウダリンング性に優れている。On the other hand, the test pieces of the present invention No. 4 to 10
And 12 to 14 are all excellent in press moldability and powdering resistance.
【００４４】次に、上述した実施例１における製造条件
に、更に、相対付加長さｔp （８０％）≦９０（％）以
下の条件を付加して合金化溶融亜鉛めっき鋼板を製造
し、その各々から本発明試験片Ｎo.１７〜２８を切り出
し、上述した各種試験に供した。この結果を表２に示
す。摩擦係数の評価は、０．１４２以下が極めて良好、
０．１５０未満が良好である。相対付加長さｔp （８０
％）は、東京精密（株）製「表面粗さ形状測定機サーフ
コム５７０Ａ」によって、鋼板表面の曲線（カットオフ
値０．８ｍｍ）を測定することによって算出した。Next, the alloyed hot-dip galvanized steel sheet is manufactured by further adding the condition of the relative additional length t p (80%) ≦ 90 (%) to the manufacturing conditions in the above-mentioned Example 1, The test pieces Nos. 17 to 28 of the present invention were cut out from each of them and subjected to the various tests described above. The results are shown in Table 2. As for the evaluation of the friction coefficient, 0.142 or less is very good,
Less than 0.150 is good. Relative additional length t p (80
%) Was calculated by measuring the curve (cut-off value 0.8 mm) of the steel plate surface with "Surface roughness profiler Surfcom 570A" manufactured by Tokyo Seimitsu Co., Ltd.
【００４５】[0045]
【表２】 [Table 2]
【００４６】表２から明らかなように、ｔp （８０％）
≦９０（％）以下の条件を更に付加すると、プレス成形
性が更に優れた合金化溶融亜鉛めっき鋼板を得ることが
できた。As is clear from Table 2, t p (80%)
By further adding the condition of ≦ 90 (%) or less, it was possible to obtain an alloyed hot-dip galvanized steel sheet having further excellent press formability.
【００４７】[0047]
【発明の効果】以上説明したように、この発明によれ
ば、合金化溶融亜鉛めっき鋼板表面に形成する凹部の
数、深さおよび面積率を調整することによって、プレス
成形性に優れた合金化溶融亜鉛めっき鋼板を得ることが
できるといった有用な効果がもたらされる。As described above, according to the present invention, by adjusting the number, the depth and the area ratio of the recesses formed on the surface of the galvannealed steel sheet, an alloy having excellent press formability is formed. A useful effect that a hot-dip galvanized steel sheet can be obtained is brought about.
【図１】この発明の表面粗さ曲線（カットオフ値０．８
ｍｍ）のプロフィルを示す図である。FIG. 1 is a surface roughness curve of the present invention (cutoff value 0.8
(mm) profile.
【図２】この発明の、プレス成形性および塗装後鮮映性
に優れた合金化溶融亜鉛めっき鋼板の断面の一例を示す
模式図である。FIG. 2 is a schematic view showing an example of a cross section of an alloyed hot-dip galvanized steel sheet which is excellent in press formability and image clarity after coating according to the present invention.
【図３】この発明の、プレス成形性に優れた合金化溶融
亜鉛めっき鋼板表面組織の走査型電子顕微鏡写真の一例
である。FIG. 3 is an example of a scanning electron micrograph of the surface structure of the galvannealed steel sheet having excellent press formability according to the present invention.
【図４】従来の合金化溶融亜鉛めっき鋼板表面組織の走
査型電子顕微鏡写真の一例である。FIG. 4 is an example of a scanning electron micrograph of a surface structure of a conventional galvannealed steel sheet.
【図５】プレス成形性を評価するための摩擦係数測定装
置を示す正面図である。FIG. 5 is a front view showing a friction coefficient measuring device for evaluating press formability.
【図６】耐パウダリング性を評価するためのドロービー
ド試験機を示す正面図である。FIG. 6 is a front view showing a draw bead tester for evaluating powdering resistance.
１：平均線、 ２：最高山頂レベルの直線、 ３：最低谷底レベルの直線、 ４：レベル８０％の直線、 ５：下地鋼板、 ６：めっき皮膜、 ７：ビード、 ８：試験片、 ９：試料台、 10：ローラー、 11：ロードセル、 12：ロードセル、 13：レール、 14：試験片、 15：ビード、 16：ダイ、 17：油圧装置、 18：ロードセル。 1: Average line, 2: Straight line of highest peak level, 3: Straight line of lowest valley bottom level, 4: Straight line of level 80%, 5: Base steel plate, 6: Plating film, 7: Bead, 8: Test piece, 9: Sample stand, 10: Roller, 11: Load cell, 12: Load cell, 13: Rail, 14: Test piece, 15: Bead, 16: Die, 17: Hydraulic system, 18: Load cell.
Claims (2)
合）：１０〜７０％ を満足する凹部が表面に形成されていることを特徴とす
る、プレス成形性に優れた合金化溶融亜鉛めっき鋼板。1. The following conditions: depth: 2 μm or more; number: 200 to 8200 / mm 2 ; area ratio (ratio of opening area of recesses per unit area): 10 to 70% A galvannealed steel sheet having excellent press formability, which is characterized in that
測定長さに間において、平均線に平行で、且つ、最高山
頂から、最高山頂を０％、最低谷底１００％としたとき
の百分率で表した切断レベル８０％にある直線で切断さ
れる長さを、前記測定長さに対する百分率で表した相対
負荷長さｔp （８０％）が９０（％）以下の条件を更に
満足する凹部が表面に形成されていることを特徴とす
る、請求項１記載の合金化溶融亜鉛めっき鋼板。2. When the cutoff value is parallel to the average line between the measurement lengths of the roughness curves of 0.8 mm and the highest peak is 0%, the highest peak is 0%, and the lowest valley bottom is 100%. The condition that the length cut by a straight line at a cutting level of 80% expressed as a percentage is 90% or less as a relative load length t p (80%) expressed as a percentage with respect to the measured length is further satisfied. The galvannealed steel sheet according to claim 1, characterized in that recesses are formed on the surface.
Priority Applications (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05186706A JP3139232B2 (en) | 1993-06-30 | 1993-06-30 | Galvannealed steel sheet with excellent press formability |
| DE69418437T DE69418437T2 (en) | 1993-06-30 | 1994-06-29 | HOT-GALVANIZED STEEL SHEET WITH GOOD PRESSABILITY |
| US08/356,341 US5629099A (en) | 1993-06-30 | 1994-06-29 | Alloying-treated iron-zinc alloy dip-plated steel sheet excellent in press-formability and method for manufacturing same |
| EP03008199A EP1338669B1 (en) | 1993-06-30 | 1994-06-29 | Method for manufacturing an alloying-treated iron-zinc alloy dip-plated steel sheet excellent in press-formability |
| EP98111150A EP0882810B1 (en) | 1993-06-30 | 1994-06-29 | Method for manufacturing an alloying-treated iron-zinc alloy dip-plated steel sheet excellent in press-formability |
| EP94919818A EP0657561B1 (en) | 1993-06-30 | 1994-06-29 | Alloyed hot dip iron-zinc-alloy plated steel plate having excellent press moldability |
| DE69435062T DE69435062T2 (en) | 1993-06-30 | 1994-06-29 | Process for producing an alloyed iron-zinc hot-dip galvanized steel plate with good pressability |
| KR1019950700856A KR100188044B1 (en) | 1993-06-30 | 1994-06-29 | Alloying-treated iron-zinc alloy dip-plated steel sheet excellent in press-formability and methoid for manufacturing same |
| DE69433414T DE69433414T2 (en) | 1993-06-30 | 1994-06-29 | Process for producing a hot-dip galvanized steel sheet with excellent press formability |
| PCT/JP1994/001052 WO1995001462A1 (en) | 1993-06-30 | 1994-06-29 | Alloyed hot dip iron-zinc-alloy plated steel plate having excellent press moldability and method of manufacturing the same |
| EP03008200A EP1323843A3 (en) | 1993-06-30 | 1994-06-29 | method for manufacturing an alloying-treated iron-zinc alloy dip-plated steel sheet excellent in press-formability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05186706A JP3139232B2 (en) | 1993-06-30 | 1993-06-30 | Galvannealed steel sheet with excellent press formability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0718403A true JPH0718403A (en) | 1995-01-20 |
| JP3139232B2 JP3139232B2 (en) | 2001-02-26 |
Family
ID=16193215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05186706A Expired - Fee Related JP3139232B2 (en) | 1993-06-30 | 1993-06-30 | Galvannealed steel sheet with excellent press formability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3139232B2 (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09209107A (en) * | 1996-01-30 | 1997-08-12 | Kobe Steel Ltd | Galvannealed steel sheet excellent in press formability |
| JPH1192905A (en) * | 1997-09-18 | 1999-04-06 | Kobe Steel Ltd | Hot-dip alloyed galvannealed steel sheet excellent in workability and image clarity |
| JPH11217660A (en) * | 1998-01-30 | 1999-08-10 | Sumitomo Metal Ind Ltd | Hot dip galvannealed steel sheet and its production |
| JPH11229104A (en) * | 1998-02-18 | 1999-08-24 | Sumitomo Metal Ind Ltd | Hot dip galvannealed steel sheet and its production |
| JP2000017417A (en) * | 1998-07-03 | 2000-01-18 | Kawasaki Steel Corp | Hot dip galvannealed steel sheet |
| JP2000226646A (en) * | 1999-02-03 | 2000-08-15 | Kawasaki Steel Corp | Hot dip galvannealed steel sheet excellent in press formability |
| JP2009057585A (en) * | 2007-08-30 | 2009-03-19 | Jfe Steel Kk | Hot-dip galvannealed steel sheet with chromate-free coating and manufacturing method therefor |
| CN102019323A (en) * | 2009-09-16 | 2011-04-20 | 日本航空电子工业株式会社 | Stamping tool and treatment method for stamping tool surface |
| JPWO2015147301A1 (en) * | 2014-03-28 | 2017-04-13 | アベル株式会社 | Stainless steel sheet |
| US9636737B2 (en) | 2010-02-01 | 2017-05-02 | Japan Aviation Electronics Industry Limited | Slide part and surface processing methods of the same |
| JP2018535313A (en) * | 2015-09-30 | 2018-11-29 | ティッセンクルップ スチール ヨーロッパ アクチェンゲゼルシャフトＴｈｙｓｓｅｎＫｒｕｐｐ Ｓｔｅｅｌ Ｅｕｒｏｐｅ ＡＧ | Flat steel product having a Zn galvanic treatment protective coating and method for producing the same |
-
1993
- 1993-06-30 JP JP05186706A patent/JP3139232B2/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09209107A (en) * | 1996-01-30 | 1997-08-12 | Kobe Steel Ltd | Galvannealed steel sheet excellent in press formability |
| JPH1192905A (en) * | 1997-09-18 | 1999-04-06 | Kobe Steel Ltd | Hot-dip alloyed galvannealed steel sheet excellent in workability and image clarity |
| JPH11217660A (en) * | 1998-01-30 | 1999-08-10 | Sumitomo Metal Ind Ltd | Hot dip galvannealed steel sheet and its production |
| JPH11229104A (en) * | 1998-02-18 | 1999-08-24 | Sumitomo Metal Ind Ltd | Hot dip galvannealed steel sheet and its production |
| JP2000017417A (en) * | 1998-07-03 | 2000-01-18 | Kawasaki Steel Corp | Hot dip galvannealed steel sheet |
| JP2000226646A (en) * | 1999-02-03 | 2000-08-15 | Kawasaki Steel Corp | Hot dip galvannealed steel sheet excellent in press formability |
| JP2009057585A (en) * | 2007-08-30 | 2009-03-19 | Jfe Steel Kk | Hot-dip galvannealed steel sheet with chromate-free coating and manufacturing method therefor |
| CN102019323A (en) * | 2009-09-16 | 2011-04-20 | 日本航空电子工业株式会社 | Stamping tool and treatment method for stamping tool surface |
| US8683901B2 (en) | 2009-09-16 | 2014-04-01 | Japan Aviation Electronics Industry Limited | Stamping tool and treatment method for stamping tool surface |
| US9233410B2 (en) | 2009-09-16 | 2016-01-12 | Japan Aviation Electronics Industry, Limited | Treatment method for stamping tool surface |
| US9636737B2 (en) | 2010-02-01 | 2017-05-02 | Japan Aviation Electronics Industry Limited | Slide part and surface processing methods of the same |
| US9852886B2 (en) | 2010-02-01 | 2017-12-26 | Japan Aviation Electronics Industry Limited | Slide part and surface processing method of the same |
| US9875880B2 (en) | 2010-02-01 | 2018-01-23 | Japan Aviation Electronics Industry, Limited | Slide part and surface processing method of the same |
| JPWO2015147301A1 (en) * | 2014-03-28 | 2017-04-13 | アベル株式会社 | Stainless steel sheet |
| JP2018535313A (en) * | 2015-09-30 | 2018-11-29 | ティッセンクルップ スチール ヨーロッパ アクチェンゲゼルシャフトＴｈｙｓｓｅｎＫｒｕｐｐ Ｓｔｅｅｌ Ｅｕｒｏｐｅ ＡＧ | Flat steel product having a Zn galvanic treatment protective coating and method for producing the same |
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|---|---|
| JP3139232B2 (en) | 2001-02-26 |
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