JP3168890B2 - Al-Zn based alloy plated steel sheet with excellent press formability and heat resistance - Google Patents
Al-Zn based alloy plated steel sheet with excellent press formability and heat resistanceInfo
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- JP3168890B2 JP3168890B2 JP27757795A JP27757795A JP3168890B2 JP 3168890 B2 JP3168890 B2 JP 3168890B2 JP 27757795 A JP27757795 A JP 27757795A JP 27757795 A JP27757795 A JP 27757795A JP 3168890 B2 JP3168890 B2 JP 3168890B2
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- heat resistance
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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】この発明は優れた深絞り成形
性と耐熱性を合わせ持つアルミニウム−亜鉛合金めっき
鋼板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum-zinc alloy plated steel sheet having both excellent deep drawability and heat resistance.
【０００２】[0002]
【従来の技術】アルミニウム−亜鉛合金めっき鋼板は、
高い耐食性・耐候性を有し、建材用途などに使用されて
いるほか、耐熱性も併せ持ち電気器具、熱器具、自動車
などの耐熱用途にも使用されている（特公昭46-7161 号
公報など）。このめっき鋼板は、一般に、冷間圧延後の
鋼板を連続溶融亜鉛めっきラインに通板して、連続焼
鈍、めっき浴へ浸漬の後めっき付着量を調整して製造さ
れている。2. Description of the Related Art Aluminum-zinc alloy-plated steel sheets are:
It has high corrosion resistance and weather resistance and is used for building materials, etc. It also has heat resistance and is used for heat-resistant applications such as electric appliances, heating appliances, and automobiles (Japanese Patent Publication No. 46-7161) . In general, this plated steel sheet is manufactured by passing a cold-rolled steel sheet through a continuous hot-dip galvanizing line, continuously annealing, immersing the steel sheet in a plating bath, and then adjusting the coating weight.
【０００３】このアルミニウム−亜鉛合金めっき鋼板
は、耐熱性の限界を超える環境下で使用された場合、め
っき皮膜と下地鋼板との合金化が急激に進行し、耐食性
などの特性が劣化してしまう。これに対して、特公平1-
35071 号公報には、アルミニウム−亜鉛合金めっき鋼板
の下地鋼板にＰを０．０３９重量％以上含有する炭素鋼
を使用することにより、高温環境下での下地鋼板へのＺ
ｎの拡散が抑制され、耐熱特性が向上することが開示さ
れている。When this aluminum-zinc alloy-plated steel sheet is used in an environment exceeding the limit of heat resistance, alloying between a plating film and a base steel sheet progresses rapidly, and properties such as corrosion resistance deteriorate. . On the other hand,
Japanese Patent No. 35071 discloses that a carbon steel containing 0.039% by weight or more of P is used as a base steel sheet of an aluminum-zinc alloy-plated steel sheet so that the base steel sheet in a high-temperature environment can be formed.
It is disclosed that diffusion of n is suppressed and heat resistance is improved.
【０００４】[0004]
【発明が解決しようとする課題】電気製品や自動車など
の用途では苛酷な成形加工が行われる場合があり、この
場合、アルミニウム−亜鉛合金めっき鋼板に高い成形加
工性が要求される。連続溶融亜鉛めっきでは、このよう
な用途の素材として、深絞り性に優れ非時効性の鋼板の
得られる極低炭素鋼にＴｉなどを添加したいわゆるＩＦ
(Interstitial Free) 鋼が用いられるのが一般的であ
る。In applications such as electric products and automobiles, severe forming may be performed. In this case, high formability is required for the aluminum-zinc alloy-plated steel sheet. In continuous hot-dip galvanizing, as a material for such an application, a so-called IF obtained by adding Ti or the like to an ultra-low carbon steel capable of obtaining a non-aging steel sheet having excellent deep drawability.
(Interstitial Free) Steel is generally used.
【０００５】しかしながら、このようなＩＦ鋼を下地鋼
板とするアルミニウム−亜鉛合金めっき鋼板では、耐熱
限界温度近傍において、より深絞り成形性の劣る一般の
低炭素アルミキルド鋼を下地鋼板とする場合よりも、め
っき皮膜と下地鋼板の合金化の進行がかなり早く、耐熱
耐久性に劣るものとなっていた。これは、このようなＩ
Ｆ鋼においては、鋼の清浄性が一般の低炭素鋼に比較し
て非常に高く、このため結晶粒界での合金化反応がより
早いためである。However, such an aluminum-zinc alloy-plated steel sheet using an IF steel as a base steel sheet has a lower deep drawability than a general low-carbon aluminum-killed steel sheet near the heat-resistant limit temperature. In addition, the progress of alloying between the plating film and the base steel sheet was considerably quick, and the heat resistance and durability were poor. This is because I
This is because in steel F, the cleanliness of the steel is much higher than that of general low carbon steel, and therefore, the alloying reaction at the grain boundaries is faster.
【０００６】耐熱性改善のため、このようなＩＦ鋼への
前述のような高濃度のＰの添加は、鋼の強度上昇を招い
て成形性を低下させるばかりでなく、低温靭性を低下さ
せ２次加工脆性をも劣化させてしまい、このような苛酷
な成形加工用途への適用は困難となる場合がある。[0006] In order to improve heat resistance, the addition of a high concentration of P to such IF steel as described above not only causes an increase in the strength of the steel, thereby lowering the formability but also lowering the low-temperature toughness. The secondary working brittleness is also degraded, and it may be difficult to apply to such severe forming applications.
【０００７】本発明は、このような問題を有利に解決す
るものであって、優れた深絞り成形性（プレス成形性）
と耐熱性とを備えたアルミニウム−亜鉛合金めっき鋼板
を提供するものである。The present invention advantageously solves such a problem, and has excellent deep drawability (press formability).
The present invention provides an aluminum-zinc alloy-plated steel sheet having heat resistance and heat resistance.
【０００８】[0008]
【課題を解決するための手段】本発明者は、このような
目的のための検討してきた結果、下地鋼板の化学成分お
よびその濃度を適正に規制することによりＩＦ鋼の特性
を損なわず、高温環境における合金化の進行を抑制する
ことが可能となることを見出だした。The present inventor has studied for such a purpose, and as a result, by properly regulating the chemical composition and the concentration of the base steel sheet, the characteristics of the IF steel are not impaired, and the high temperature It has been found that the progress of alloying in the environment can be suppressed.
【０００９】すなわち、本発明の要旨とするところは、
重量％で、Ｃ：０．００３０％未満、Ｓ：０．０１５％
以下、Ｎ：０．００３０％以下、Ｔｉ：０．０２〜０．
１％，Ｂ：０．０００２〜０．００１５％，Ｐ：０．０
３６％以下、好ましくは０．０２〜０．０３６％を含有
し、さらにＳｉ：０．０５％以下、Ｍｎ：０．０５〜
０．５％，ｓｏｌ．Ａｌ：０．０２〜０．１％を含む鋼
板に、Ａｌ：２５〜９０％，Ｓｉ：Ａｌ量の１％以上１
０％以下を含み、残部は実質的にＺｎであるＡｌ−Ｚｎ
系合金めっきを施したことを特徴とするプレス成形性お
よび耐熱性に優れたアルミニウム−亜鉛合金めっき鋼板
である。That is, the gist of the present invention is as follows.
By weight%, C: less than 0.0030%, S: 0.015%
Below, N: 0.0030% or less, Ti: 0.02-0.
1%, B: 0.0002 to 0.0015%, P: 0.0
36% or less, preferably 0.02 to 0.036%, Si: 0.05% or less, Mn: 0.05 to
0.5%, sol. Al: 25 to 90% in a steel sheet containing 0.02 to 0.1%, Si: 1% or more of the amount of Al
Al-Zn containing 0% or less and the balance being substantially Zn
An aluminum-zinc alloy-plated steel sheet excellent in press formability and heat resistance characterized by being subjected to base alloy plating.
【００１０】以下、本発明について詳細に説明する。本
発明のアルミニウム−亜鉛合金めっき鋼板は、通常の工
程を経て製造された冷間圧延後の鋼板を連続溶融亜鉛め
っきラインにおいて、連続焼鈍、めっき浴への浸漬、付
着量の調整を行って、アルミニウム−亜鉛合金めっき鋼
板を製造するものである。下地鋼板の各化学成分は、以
下に示すように、めっき後の鋼板の諸性質におよぼす作
用から定めた。Hereinafter, the present invention will be described in detail. The aluminum-zinc alloy-plated steel sheet of the present invention is a steel sheet after cold rolling manufactured through a normal process, in a continuous hot-dip galvanizing line, continuous annealing, immersion in a plating bath, adjusting the amount of adhesion, It is for producing aluminum-zinc alloy-plated steel sheets. Each chemical component of the base steel sheet was determined from the effect on various properties of the steel sheet after plating, as described below.
【００１１】Ｃは、高い深絞り成形性を得るためには低
い方がよいが、実用上本発明の効果を損なわない範囲と
して、０．００３重量％未満とした。Ｓは、鋼板の延性
に有害な元素であり出来るだけ低い方がよいが、実用上
本発明の効果を損なわない範囲として、その上限を０．
０１５重量％とした。C is preferably low in order to obtain high deep drawability, but is set to less than 0.003% by weight as far as the effect of the present invention is not practically impaired. S is an element that is harmful to the ductility of the steel sheet and should be as low as possible. However, the upper limit is set to 0.
015% by weight.
【００１２】Ｎは、高成形成を得るためには少ない方が
望ましく、実用上本発明の効果を損なわない範囲とし
て、その上限を０．００３重量％とした。Ｔｉは、鋼中
の固溶Ｃ，Ｎを析出物として固定し、高い深絞り成形性
を得るためには不可欠な成分である。０．０２重量％未
満ではその効果が十分でなく、また、０．１重量％を超
えて含有してもその効果が飽和するばかりか、コスト的
にも不利となるため０．０２〜０．１重量％の範囲に限
定した。N is desirably small in order to obtain a high degree of formation, and the upper limit is made 0.003% by weight as far as the effect of the present invention is not practically impaired. Ti is an essential component for fixing solid solution C and N in steel as precipitates and obtaining high deep drawability. If the content is less than 0.02% by weight, the effect is not sufficient, and if the content exceeds 0.1% by weight, the effect is not only saturated, but also disadvantageous in cost, so that 0.02 to 0. It was limited to the range of 1% by weight.
【００１３】Ｂは、微量の添加でも、結晶粒界に濃化し
粒界拡散によって促進される高温環境でのめっき皮膜と
下地鋼板の合金化を抑制する効果がある。このためにＢ
は、０．０００２重量％以上の添加が必要である。しか
し、Ｂは鋼板の深絞り成形性を劣化させる元素であり、
０．００１５重量％を超えると深絞り成形性が実用上問
題となる。すなわち、このような微量の範囲で、耐熱性
と深絞り成形性のバランスが可能となるのである。B, even when added in a small amount, has the effect of suppressing the alloying of the plating film and the base steel sheet in a high-temperature environment promoted by the grain boundary diffusion and grain boundary diffusion. For this reason B
Requires an addition of 0.0002% by weight or more. However, B is an element that deteriorates the deep drawability of a steel sheet,
If it exceeds 0.0015% by weight, deep drawability becomes a practical problem. That is, the heat resistance and the deep drawing formability can be balanced in such a small amount range.
【００１４】Ｐは、前述のように高温環境でのめっき皮
膜と下地鋼板の合金化を抑制する効果があるが、Ｐを単
独で添加する場合、比較的高濃度の添加が必要とされ
る。しかし、比較的高濃度のＰの添加は、鋼の強度上昇
を招いて成形性を低下させるため、Ｐの添加量を低く押
さえる必要がある。本発明では、Ｂとの複合添加とする
ことにより、０．０３６重量％以下という少ないＰの添
加量で耐熱性改善効果を向上することができる。ただ
し、好ましくは、０．０２重量％〜０．０３６重量％と
する。また、Ｐ添加による２次加工脆性の低下は、Ｂを
複合添加しているために緩和され、このような少ない添
加範囲では問題とならない。As described above, P has an effect of suppressing alloying between the plating film and the base steel sheet in a high-temperature environment. However, when P is added alone, a relatively high concentration of P is required. However, the addition of a relatively high concentration of P causes an increase in the strength of the steel and lowers the formability. Therefore, it is necessary to keep the amount of P added low. In the present invention, the effect of improving heat resistance can be improved with a small addition amount of P of 0.036% by weight or less by using a composite addition with B. However, preferably, it is 0.02% by weight to 0.036% by weight. Further, the decrease in the brittleness of the secondary working due to the addition of P is alleviated because B is added in combination, and there is no problem in such a small addition range.
【００１５】Ｓｉは、必要により添加する鋼を強化する
元素で、それぞれＳｉ：０．０５重量％を超えて添加す
ると延性が低下し成形性に悪影響が出るため、この範囲
とした。Si is an element which strengthens steel, which is added as necessary. If each of Si exceeds 0.05% by weight, ductility is reduced and formability is adversely affected.
【００１６】Ｍｎも、必要により添加し、Ｓｉと同様に
強度上昇に影響する元素で、０．５重量％を超えて添加
すると成形性を劣化させるため、この範囲とした。Ａｌ
は、必要により添加し、脱酸の目的で添加する元素で、
ｓｏｌ．Ａｌ：０．０２重量％以上必要であるが、多量
に添加しても効果が飽和するため上限を０．１重量％と
した。Mn is also added as necessary and affects the increase in strength, similarly to Si. When added in excess of 0.5% by weight, the formability is deteriorated. Al
Is an element added as needed and added for the purpose of deoxidation,
sol. Al: 0.02% by weight or more is required, but the effect is saturated even if added in a large amount, so the upper limit was made 0.1% by weight.
【００１７】上述の成分の鋼を通常の方法により熱間圧
延、酸洗の後、冷間圧延し、その後、連続溶融亜鉛めっ
きラインにて連続焼鈍され、所定のめっき浴に浸漬され
た後ガスワイピングによりめっき付着量が調整され、ア
ルミニウム−亜鉛合金めっき鋼板が製造される。The steel having the above-mentioned composition is hot-rolled, pickled and then cold-rolled by a usual method, then continuously annealed in a continuous hot-dip galvanizing line, immersed in a predetermined plating bath, and then immersed in gas. The coating weight is adjusted by wiping, and an aluminum-zinc alloy plated steel sheet is manufactured.
【００１８】このアルミニウム−亜鉛合金めっきはＡｌ
およびＺｎを主成分とし、少量のＳｉを添加したもので
あるが、めっき皮膜特性の改善のため微量の合金添加元
素を添加したものも本発明の適用の範囲に含まれる。こ
こで、Ａｌはめっき皮膜に耐食性、耐熱性を付与する元
素であるが、２５重量％未満ではこれらの特性に劣り、
９０重量％を越えるとＺｎ含有量が少なく犠牲防食性に
劣る。Ｓｉはめっき時のＦｅ−Ａｌを主体とする合金層
の発達を抑制するために添加する。Ａｌ量の１％未満で
は合金層の抑制が不十分であり、Ａｌ量の１０％を越え
るとめっき皮膜の加工時のクラックが多くなるなど皮膜
特性が劣化する。This aluminum-zinc alloy plating is made of Al
And Zn as a main component, to which a small amount of Si is added. However, those to which a small amount of alloying elements are added for improving the plating film characteristics are also included in the scope of the present invention. Here, Al is an element that imparts corrosion resistance and heat resistance to the plating film, but if it is less than 25% by weight, these properties are inferior.
If it exceeds 90% by weight, the Zn content is small and the sacrificial corrosion resistance is poor. Si is added to suppress the development of an alloy layer mainly composed of Fe-Al during plating. If the Al content is less than 1%, the suppression of the alloy layer is insufficient.
【００１９】[0019]
【発明の実施の形態】次に本発明を具体例を用いてさら
に詳しく説明する。表１、表２に示す本発明鋼成分及び
表３に示す比較鋼成分の連続鋳造鋼片を、それぞれ１１
５０〜１２５０℃に加熱した後、熱間圧延して厚さ３．
２ｍｍの鋼板とし、５７０〜６７０℃で巻取り、続い
て、酸洗の後、板厚０．７ｍｍまで冷間圧延を行った。
次いで、連続溶融亜鉛めっきラインにて、８２０〜８９
０℃で連続焼鈍を行った後Ｚｎ−５５重量％Ａｌ−１．
５重量％Ｓｉ合金めっき浴（浴温６００℃）を通過させ
て付着量調整の後、両面で１５０ｇ／ｍ2 のアルミニウ
ム−亜鉛合金めっき鋼板を得た。得られたアルミニウム
−亜鉛合金めっき鋼板について、以下の性能試験を行っ
た。Next, the present invention will be described in more detail with reference to specific examples. Continuously cast steel slabs of the steel composition of the present invention shown in Tables 1 and 2 and the comparative steel composition shown in Table 3 were each subjected to 11
After heating to 50 to 1250 ° C, hot rolling is performed to a thickness of 3.
A 2 mm steel plate was wound at 570 to 670 ° C., and subsequently, after pickling, cold rolled to a plate thickness of 0.7 mm.
Next, in a continuous hot-dip galvanizing line, 820 to 89
After continuous annealing at 0 ° C., Zn-55 wt% Al-1.
After passing through a 5 wt% Si alloy plating bath (bath temperature 600 ° C.) to adjust the amount of adhesion, aluminum-zinc alloy plated steel sheets of 150 g / m 2 were obtained on both sides. The following performance tests were performed on the obtained aluminum-zinc alloy-plated steel sheet.
【００２０】（１）プレス成形性 ＪＩＳ５号試験片に加工の後、引張り試験を行って機械
的特性値を測定し、伸び（Ｅ１）およびランクフォード
値（ｒ値）により成形性を評価した。(1) Press Formability After processing into a JIS No. 5 test piece, a tensile test was performed to measure mechanical property values, and the formability was evaluated based on elongation (E1) and Rankford value (r value).
【００２１】ｒ値は圧延方向に０，４５，９０度の方向
でそれぞれ測定し、次の式により平均のｒ値（ｒ＊）と
して評価した。 ｒ＊＝１／４（ｒ0 ＋２ｒ45＋ｒ90） 以上の評価では、Ｅｌ：４０％以上かつｒ＊値１．８５
以上の材料について成形性良好とした。その評価を表４
〜表６に示す（表６は比較例）。The r value was measured in the directions of 0, 45, and 90 degrees in the rolling direction, and evaluated as an average r value (r *) according to the following equation. r * = 1/4 (r 0 + 2r 45 + r 90 ) In the evaluation above, El: 40% or more and r * value 1.85
The above materials were determined to have good moldability. Table 4 shows the evaluation.
To Table 6 (Table 6 is a comparative example).
【００２２】（２）耐熱性 試料を大気雰囲気中４００℃で４８０時間加熱し、試料
の表面状態を観察した。その観察結果を表２に示す。こ
こで、各符号は以下の意味である。(2) Heat resistance The sample was heated at 400 ° C. for 480 hours in an air atmosphere, and the surface condition of the sample was observed. Table 2 shows the observation results. Here, each symbol has the following meaning.
【００２３】 ○：表面状態にほとんど変化無く、良好 △：局部的に表面迄合金化の進行が見られ、表面がわず
かに灰黒色に変化 ×：合金化の進行が著しく、表面のかなりの部分が灰黒
色に変化 表４〜表６から、本発明の試料は、いずれもプレス成形
性、耐熱性に優れていることがわかる。：: Almost no change in surface state, good. 合金: Alloying progressed locally to the surface, slightly grayish black on the surface. ×: Significant progress of alloying, considerable part of the surface. From Tables 4 to 6 indicate that the samples of the present invention are all excellent in press moldability and heat resistance.
【００２４】[0024]
【表１】 [Table 1]
【００２５】[0025]
【表２】 [Table 2]
【００２６】[0026]
【表３】 [Table 3]
【００２７】[0027]
【表４】 [Table 4]
【００２８】[0028]
【表５】 [Table 5]
【００２９】[0029]
【表６】 [Table 6]
【００３０】[0030]
【発明の効果】以上述べたように本発明によれば、プレ
ス成形性に優れ、かつ、耐熱性にも優れるアルミニウム
−亜鉛合金めっき鋼板を得ることができるものであっ
て、この工業的利用価値は高い。As described above, according to the present invention, it is possible to obtain an aluminum-zinc alloy-plated steel sheet having excellent press formability and excellent heat resistance. Is expensive.
【図１】Ｂ添加量に伴う耐熱性とｒ*値の変化を示す図
面。FIG. 1 is a drawing showing changes in heat resistance and r * value with the addition amount of B.
【図２】Ｐ添加量に伴う耐熱性とＥｌの変化を示す図
面。FIG. 2 is a graph showing changes in heat resistance and El according to the amount of P added.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C23C 2/00 - 2/40 C22C 38/00 301 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. 7 , DB name) C23C 2/00-2/40 C22C 38/00 301
Claims (2)
０．０１５％以下、Ｎ：０．００３％以下、Ｔｉ：０．
０２〜０．１％，Ｂ：０．０００２〜０．００１５％、
Ｐ：０．０３６％以下を含有する鋼板に、Ａｌ：２５〜
９０％，Ｓｉ：Ａｌ量の１％以上１０％以下、残部は実
質的にＺｎであるＡｌ−Ｚｎ系合金めっきを施したこと
を特徴とするプレス成形性および耐熱性に優れたアルミ
ニウム−亜鉛合金めっき鋼板。C. Less than 0.003% by weight, S:
0.015% or less, N: 0.003% or less, Ti: 0.
02-0.1%, B: 0.0002-0.0015%,
P: 0.036% or less of steel sheet containing Al: 25 to
Aluminum-zinc alloy excellent in press formability and heat resistance characterized by being subjected to Al-Zn-based alloy plating in which 90%, Si: Al amount is 1% or more and 10% or less, and the balance is substantially Zn. Plated steel sheet.
０５％以下、Ｍｎ：０．０５〜０．５％，sol.Ａｌ：
０．０２〜０．１％を含む請求項１又は２に記載のプレ
ス成形性および耐熱性に優れたアルミニウム−亜鉛合金
めっき鋼板。2. The steel sheet, in terms of% by weight, further contains Si: 0.1%.
05% or less, Mn: 0.05-0.5%, sol. Al:
The aluminum-zinc alloy-plated steel sheet having excellent press formability and heat resistance according to claim 1 or 2, which contains 0.02 to 0.1%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27757795A JP3168890B2 (en) | 1995-05-10 | 1995-10-25 | Al-Zn based alloy plated steel sheet with excellent press formability and heat resistance |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7-111619 | 1995-05-10 | ||
| JP11161995 | 1995-05-10 | ||
| JP27757795A JP3168890B2 (en) | 1995-05-10 | 1995-10-25 | Al-Zn based alloy plated steel sheet with excellent press formability and heat resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0925551A JPH0925551A (en) | 1997-01-28 |
| JP3168890B2 true JP3168890B2 (en) | 2001-05-21 |
Family
ID=26450973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27757795A Expired - Fee Related JP3168890B2 (en) | 1995-05-10 | 1995-10-25 | Al-Zn based alloy plated steel sheet with excellent press formability and heat resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3168890B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2780984B1 (en) * | 1998-07-09 | 2001-06-22 | Lorraine Laminage | COATED HOT AND COLD STEEL SHEET HAVING VERY HIGH RESISTANCE AFTER HEAT TREATMENT |
| CN1655869A (en) | 2002-03-25 | 2005-08-17 | 住友钛株式会社 | Titanium oxide-based photocatalyst, manufacturing method therefor and its application |
-
1995
- 1995-10-25 JP JP27757795A patent/JP3168890B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0925551A (en) | 1997-01-28 |
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