JPH0441657A - Production of zn-high al alloy plated steel sheet excellent in workability - Google Patents
Production of zn-high al alloy plated steel sheet excellent in workabilityInfo
- Publication number
- JPH0441657A JPH0441657A JP14860690A JP14860690A JPH0441657A JP H0441657 A JPH0441657 A JP H0441657A JP 14860690 A JP14860690 A JP 14860690A JP 14860690 A JP14860690 A JP 14860690A JP H0441657 A JPH0441657 A JP H0441657A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- heat treatment
- plated steel
- workability
- alloy
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 52
- 239000010959 steel Substances 0.000 title claims abstract description 52
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000005422 blasting Methods 0.000 claims abstract description 21
- 238000010422 painting Methods 0.000 claims description 6
- 238000007747 plating Methods 0.000 abstract description 20
- 238000000576 coating method Methods 0.000 abstract description 5
- 239000011248 coating agent Substances 0.000 abstract description 4
- 229910045601 alloy Inorganic materials 0.000 description 10
- 239000000956 alloy Substances 0.000 description 10
- 239000010410 layer Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 238000005452 bending Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000011701 zinc Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 229910007570 Zn-Al Inorganic materials 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229910000714 At alloy Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910000713 I alloy Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910000611 Zinc aluminium Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Landscapes
- Coating With Molten Metal (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、加工性の優れたＺｎ−高Ａｌ合金めっき綱板
の製造方法、とくにこの種の処理綱板を連続ラインで製
造し得る技術に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a Zn-high Al alloy plated steel sheet with excellent workability, and in particular, a technology that allows this type of treated steel sheet to be manufactured on a continuous line. It is related to.
一般に、Ａｌを２５〜７５ｗｔ％含むＺｎ−高Ａｌ合金
めっき鋼板は、通常のＺｎめっき鋼板あるいは、Ｚｎ−
低Ａｌめっき鋼板に比べると耐食性が著しく良いことが
知られており、そのために高耐食性が要求される分野で
の需要が増加している。しかし、この鋼板におけるかか
るＺｎ−高Ａｌ合金めっき層は、加工性が悪く、通常の
曲げ加工でも割れを発生し易いことが課題となっていた
。Generally, a Zn-high Al alloy plated steel sheet containing 25 to 75 wt% of Al is a normal Zn-plated steel sheet or a Zn-
It is known that it has significantly better corrosion resistance than low-Al plated steel sheets, and as a result, demand for it is increasing in fields that require high corrosion resistance. However, the Zn-high Al alloy plating layer on this steel plate has poor workability and is prone to cracking even during normal bending.
そこで従来、かかるＺｎ−Ａｌ系合金めっき層の加工性
を改善するための技術が、既に幾つか提案されている。Therefore, several techniques have been proposed to improve the workability of such a Zn-Al alloy plating layer.
しかしながら、これらの提案は、例えば通常のＺｎめっ
き鋼板、あるいはＺｎ−低ＡＩ合金めっき鋼板に対して
、冷間加工を施した後再結晶焼鈍する方法（特開昭５８
−８４９６３）や、常温あるいは高温でブラスト処理す
る方法（特開昭５９−６３６３゜特開昭６２−６０８５
３）である。これらの従来技術は、いずれも通常のＺｎ
めっき鋼板あるいはＺｎ−低ＡＩ合金（例えば５％ＡＩ
）めっき鋼板を処理対象としており、いわゆる本発明の
如きＺｎ ５５ｗｔ％八１合金へっき鋼板のような、
高ＡＩ相中での析出効果の影響が格段に異なる鋼板に対
して同様に適用できるものではなく、本発明者らの研究
によっても満足できる効果は得られていなかった。However, these proposals are based on a method of cold working and then recrystallization annealing (Japanese Unexamined Patent Application Publication No. 58-111), for example, on a normal Zn-plated steel sheet or a Zn-low AI alloy-plated steel sheet.
-84963) and a method of blasting at room temperature or high temperature (JP-A-59-6363, JP-A-62-6085).
3). These conventional techniques all use ordinary Zn.
Plated steel plate or Zn-low AI alloy (e.g. 5% AI
) The target is a plated steel plate, such as the so-called Zn 55wt% 81 alloy plated steel plate of the present invention.
This method cannot be similarly applied to steel sheets in which the effects of precipitation in the high AI phase are significantly different, and the studies conducted by the present inventors have not yielded satisfactory effects.
これに対して従来、Ｚｎ−高Ａｔ合金めっきａ板を対象
としたそれの加工性を改善する方法として、表面の潤滑
性を改善する方法（特開昭６０−１９７８８１ 。On the other hand, a conventional method for improving the workability of Zn-high At alloy plated A-sheets is to improve the surface lubricity (Japanese Unexamined Patent Publication No. 197881/1983).
特公平１−５３３５３）、あるいは熱処理を施す方法（
Ｃｒａｃｋｉｎｇ ｃｈａｒａｃｔｅｒｉｓｔｉｃｓ
ｏｆ ｚｉｎｃ ａｎｄ ｚｉｎｃ−ａｌｕｍｉｎｉｕ
ｍ ａｌｌｏｙ ｃｏａｔｉｎｇｓ ： Ｄ、ＪｙＷｉ
ｌｌｉｓ＋ Ｐｒ。Japanese Patent Publication No. 1-53353) or heat treatment method (
Cracking characteristics
of zinc and zinc-aluminum
m alloy coatings: D, JyWi
llis+ Pr.
ｃｅｅｄｉｎｇｓ ｏｆ ｔｈｅ １ｎｔｅｒｎａｔｉ
ｏｎａｌ ｃｏｎｆｅｒｅｎｃｅ ｏｎｚｉｎｃ ａｎ
ｄ ｚｉｎｃ ａｌｌｏｙ ｃｏａｔｅｄ ５ｔｅｅｌ
５ｈｅｅｔ（Ｉ９８９）Ｔｏｋｙｏ ）等が提案され
ている。ceedings of the 1nternati
onal conference onzinc an
d zinc alloy coated 5teel
5heet (I989) Tokyo) etc. have been proposed.
ところが、表面の潤滑性を改善する上記従来技術は、潤
滑性を付与するための特別な処理が必要となるところか
ら製品が高価となり、まためっき層自体の材質を改善す
るものではない。従って、表面の潤滑性が支配的に寄与
するような成形加工の場合には有効であるが、めっき層
自体の加工性が要求されるような場合には有効ではない
という問題があった。However, the above-mentioned conventional technology for improving surface lubricity requires special treatment to impart lubricity, making the product expensive, and does not improve the material quality of the plating layer itself. Therefore, although it is effective in molding operations in which surface lubricity contributes dominantly, it is not effective in cases where workability of the plating layer itself is required.
一方、めっき後に熱処理を施す上記従来技術は、めっき
層の加工性の改善と同時に鋼板の加工性も改善し得るの
で有効であるが、熱処理に長時間を要する（例えば２０
０〜２５０℃で２４ｈ）ため通常の連続めっきラインや
連続塗装ラインでは処理できず、箱型炉で処理する必要
があるため、通常の連続処理ラインの他にそのような処
理設備が必要であり、製品が著しく高価になるという問
題があった。On the other hand, the above-mentioned conventional technology in which heat treatment is performed after plating is effective because it can improve the workability of the steel plate at the same time as improving the workability of the plating layer, but it requires a long time for heat treatment (for example,
(0 to 250°C for 24 hours), it cannot be processed on a normal continuous plating line or continuous painting line, and must be processed in a box furnace, so such processing equipment is required in addition to the normal continuous processing line. However, the problem was that the product became extremely expensive.
一般に溶融Ｚｎ−Ａｌ合金めっき綱板は連続ラインで製
造されており、同一ライン内で処理できる場合と出来な
い場合とではコストに著しい差を住じる。Generally, hot-dip Zn--Al alloy plated steel sheets are manufactured on a continuous line, and there is a significant difference in cost between cases where the process can be performed within the same line and cases where it cannot be processed.
そこで本発明の目的は、通常の曲げ加工を行っても、加
工部めっき層にクランクを発生しない加工性の優れたＺ
ｎ−高Ａｌ合金めっき綱板を容易に製造すること、すな
わち、溶融めっきラインや塗装ライン内で連続的に処理
することのできる製造技（ネｉを確立することにある。Therefore, an object of the present invention is to create a Z-shaped material with excellent workability that does not cause cranking in the plating layer of the processed part even when normal bending is performed.
The goal is to easily manufacture n-high Al alloy plated steel sheets, that is, to establish a manufacturing technique that can be continuously processed in a hot-dip plating line or a painting line.
本発明者らは、Ｚｎ−高Ａｌ合金めっき鋼板について、
そのめっき層の加工性について検討を重ねた結果、ブラ
スト処理後に所定の温度にて熱処理すれば、短時間の熱
処理でめっき層の成形性を著しく改善できることを知見
し本発明を完成した。The present inventors have discovered that regarding Zn-high Al alloy plated steel sheet,
As a result of repeated studies on the workability of the plating layer, we found that if heat treatment is performed at a predetermined temperature after blasting, the formability of the plating layer can be significantly improved with a short heat treatment, and we have completed the present invention.
すなわち本発明は、Ｚｎ−高Ａｌ合金めっき鋼板のめっ
き層に、予め軽い塑性変形を与え、次いでその塑性変形
処理後の鋼板を低温で短時間加熱することにより、加工
性に優れたＺｎ−高Ａｌ合金めっき鋼板を製造すること
とした方法である。That is, the present invention provides a Zn-high Al alloy coated steel sheet with excellent workability by applying slight plastic deformation to the coating layer of a Zn-high Al alloy plated steel sheet, and then heating the steel sheet after the plastic deformation treatment at a low temperature for a short time. This is a method for producing an Al alloy plated steel sheet.
なお、本発明に適合する製造条件の具体的な手段として
は、次のような条件を採用することが必要である。Note that the following conditions must be adopted as specific means for manufacturing conditions that are compatible with the present invention.
・塑性変形の付与方法 ニジヨツトブラスト・熱処理温
度（綱板温度）：１５０〜２７０ ’Ｃより好ましくは
１８０〜２３０℃
・熱処理時間 ：１０分以内
より好ましくは５分以内
〔作 用〕
以下に本発明の製造条件が上掲の如き範囲に限定される
理由を、本発明者らの行った実験結果をもとに説明する
。・Method of imparting plastic deformation: Rainbow blasting ・Heat treatment temperature (steel plate temperature): 150 to 270°C, preferably 180 to 230°C ・Heat treatment time: Within 10 minutes, preferably within 5 minutes The reason why the manufacturing conditions of the invention are limited to the above range will be explained based on the results of experiments conducted by the present inventors.
第１表は、通常のＺｎめっき鋼板（Ｇｌ）、Ｚｎ−５％
Ａｌ合金めっき鋼板（ＧＦ） 、およびＺｎ−５５％Ａ
Ｉ合金めっき鋼板（ＧＬ）について、無処理のまま、ブ
ラスト処理のみ、熱処理のみ、ブラスト処理後熱処理を
行った各場合の加工性試験の結果をまとめたものである
。なお、加工性の評価は、１を曲げ後の外面クランク発
生状況を目視判定によって５段階評価したものである。Table 1 shows ordinary Zn-plated steel sheet (Gl), Zn-5%
Al alloy plated steel sheet (GF), and Zn-55%A
This is a summary of the results of workability tests for I alloy plated steel sheets (GL) in which no treatment was performed, only blast treatment, only heat treatment, and heat treatment after blast treatment were performed. In addition, the evaluation of workability is based on a 5-level evaluation based on visual judgment of the appearance of cranks on the outer surface after bending No. 1.
第１表から判るように、Ｇｌ、 ＧＦは、加工性はブラ
スト処理によって著しく改善される。しかし、たとえそ
の後に熱処理を行っても殆ど変化しないか、むしろ幾分
低下する傾向が認められる。As can be seen from Table 1, the workability of Gl and GF is significantly improved by blasting. However, even if heat treatment is performed after that, there is a tendency that there is almost no change or, in fact, there is a tendency for it to decrease somewhat.
これに対してＧしの場合では、ブラスト処理によっても
多少の加工性改善は認められるが、その後に熱処理を行
うと加工性は著しく改善されることが認められる。そし
て、この傾向は、加工性のあまり良くない試料階■、■
のケースにおいて顕著であり、短時間熱処理（２００”
ＣＸ ３ ｌｌｌ１ｎ）のケースではとりわけ改善程度
が高いことを示している。なお、このＧＬの場合、ブラ
スト処理を行わない熱処理のみの場合でも、熱処理時間
を十分に長＜ （１０００ｗｉｎ）すれば、加工性はあ
る程度改善されるが、このような長時間の処理は、連続
ラインでは実施が困難である。On the other hand, in the case of G, although some improvement in workability is recognized by blasting, it is recognized that workability is significantly improved when heat treatment is performed thereafter. This tendency is caused by samples with poor workability.■,■
This is noticeable in the case of short heat treatment (200”
The case of CX 3 lll1n) shows that the degree of improvement is particularly high. In the case of this GL, even if only heat treatment is performed without blasting, the workability can be improved to some extent if the heat treatment time is sufficiently long (1000win), but such long-time treatment is It is difficult to implement on a line.
これに対し、ブラスト処理による塑性変形付与後に低温
熱処理を行う本発明法によれば、１０分以内、とりわけ
５分以内という短時間の熱処理でも良好な加工性を有す
る鋼板が得られることが明らかとなった。On the other hand, according to the method of the present invention in which low-temperature heat treatment is performed after imparting plastic deformation by blasting, it is clear that a steel plate with good workability can be obtained even with short heat treatment of less than 10 minutes, especially less than 5 minutes. became.
塑性変形付与方法としては、ショツトブラストの他に、
スキンパス圧延、あるいはレヘラー処理による方法も考
えられる。第２表は、板＋”ｔ Ｏ，４ｍｍ付着量７５
ｇ／ｍ２のＺｎ−５５ｗｔ％Ａｌ合金めつき銅板＜ＧＬ
）について、塑性変形を異なる方法で与えた後の加工性
、および、同試料を同一条件（２００℃Ｘ ５ ｍ１ｎ
）で熱処理した場合の加工性を示すものである。この表
から判るように、無処理（塑性変形なし）。In addition to shot blasting, methods for imparting plastic deformation include
A method using skin pass rolling or reherer treatment may also be considered. Table 2 shows board +”t O, 4mm adhesion amount 75
g/m2 Zn-55wt%Al alloy plated copper plate <GL
), the workability after applying plastic deformation using different methods, and the workability of the same sample under the same conditions (200℃
) shows the workability when heat treated. As you can see from this table, no treatment (no plastic deformation).
スキンパス圧延、レヘラー処理の各場合には、熱処理の
有無にかかわらず、加工性の改善は認められない。これ
に対し、ブラスト処理の場合には、この処理のみでも若
干の加工性改善が認められる他、さらにブラスト処理後
に熱処理を併用するという本発明条件を満たす場合には
、加工性の改善効果は著しいことが判った。In the cases of skin pass rolling and recherching, no improvement in workability was observed regardless of the presence or absence of heat treatment. On the other hand, in the case of blasting, a slight improvement in workability is observed even with this treatment alone, and if the present invention condition of using heat treatment after blasting is also met, the effect of improving workability is significant. It turned out that.
なお、このような結果を得るためのブラスト処理法とし
ては、特に限定されるものではないが、遠心式ブラスト
法が有利に適用でき、例えば直径１５０μ程度の鉄粉を
５０ ｍ ／ｓｅｃ以上の速度で５０ｋｇ／ｎ＋”以上
の投射密度で処理することが好ましい。Note that the blasting method for obtaining such results is not particularly limited, but a centrifugal blasting method can be advantageously applied. It is preferable to process at a projection density of 50 kg/n+'' or more.
次に、本発明では、熱処理条件（温度１時間）を上記の
ように限定するが、その理由は次のとおりである。Next, in the present invention, the heat treatment conditions (temperature: 1 hour) are limited as described above, and the reason is as follows.
第１図は、板厚０ 、４ ｍｍ 、目付量約８０ｇ／ｍ
”のＧＬ鋼板をそのまま熱処理した場合の加熱温度、加
熱時間と加工性との関係を、また、第２図は、同じ＜Ｇ
ＬＭ板をブラスト処理した後に第１図に示すのと同一の
条件で熱処理したものについての加工性を示すものであ
る。前者（第１図）では、充分な加工性の改善のために
は、１１０〜２２０℃の温度で数百分以上を要している
のに対し、後者（第２図）では加工性の改善は非常に短
時間で起こっており、例えば、ブラスト処理なしでその
まま熱処理した場合には、２００℃で数百分程度の加熱
を行った時に得られるのと同程度の加工性というのは、
ブラスト処理後の熱処理ではわずか２分程度で得られる
ことが判る。Figure 1 shows a board with a thickness of 0.4 mm and a basis weight of approximately 80 g/m.
Figure 2 shows the relationship between heating temperature, heating time, and workability when a GL steel plate of
This figure shows the workability of an LM plate that was blast-treated and then heat-treated under the same conditions as shown in FIG. 1. The former (Fig. 1) requires several hundred minutes or more at a temperature of 110 to 220°C to sufficiently improve workability, whereas the latter (Fig. 2) requires several hundred minutes or more to improve workability. This occurs in a very short time. For example, if heat treatment is performed without blasting, the same level of workability as that obtained by heating at 200°C for several hundred minutes is
It can be seen that heat treatment after blasting can be obtained in only about 2 minutes.
そして、この第２図の結果から判るように、めっき層に
ブラスト処理によって塑性変形を付与した後、熱処理を
行うことが有効であるが、この熱処理の温度は１５０℃
よりも低いときには、効果的な加工性改善のためには、
１０分以上の熱処理を必要とするため、連続ラインでの
実施には不都合である。また、熱処理温度が２７０℃よ
りも高いと、少なくとも短時間での効果的な加工性の改
善は得られない。従って、本発明では、熱処理の温度は
１５０〜２７０℃とすることが必要であり、短時間で、
より良い加工性改善効果を得るためには、１８０〜２３
０℃程度にすることが好ましい。As can be seen from the results shown in Figure 2, it is effective to perform heat treatment after imparting plastic deformation to the plating layer by blasting, but the temperature of this heat treatment is 150°C.
For effective processability improvement, when lower than
Since it requires heat treatment for 10 minutes or more, it is inconvenient to implement in a continuous line. Further, if the heat treatment temperature is higher than 270° C., effective improvement in workability cannot be obtained at least in a short time. Therefore, in the present invention, it is necessary to set the temperature of heat treatment to 150 to 270°C, and in a short time,
In order to obtain a better workability improvement effect, 180 to 23
The temperature is preferably about 0°C.
次に、熱処理時間は１０分以内とするが、これは連続ラ
インでの熱処理では１０分以上の熱処理時間は経済的で
なく、また、より好ましい時間とじては、通常の連続ラ
インのライン速度からみて、５分間以内の短い時間の方
がよく、製造コストの著しい低下につながる。Next, the heat treatment time should be within 10 minutes, but this is because a heat treatment time of more than 10 minutes is not economical in heat treatment on a continuous line, and a more preferable time is based on the line speed of a normal continuous line. Therefore, a shorter time of less than 5 minutes is better, leading to a significant reduction in manufacturing costs.
さて、Ｚｎ−高旧合金めっき層の加工性が長時間の熱処
理によって改善されることは、従来からよく知られてい
ることである。しかしながら、数百分以上を要する長時
間の加熱処理は、通常の連続ラインでの実施は困難であ
ることを意味している。Now, it is well known that the workability of a Zn-high aged alloy plating layer is improved by long-term heat treatment. However, a long heat treatment that requires several hundred minutes or more means that it is difficult to carry out in a normal continuous line.
このことから、従来、鋼板の材質改善のために行う箱焼
鈍以外には、本発明の如き熱処理は行われていなかった
。しかし、本発明にあっては、熱処理に先立って予めブ
ラスト処理をすることによって、熱処理時間を著しく短
縮することができるようになり、通常の連続ラインでの
実施が可能となったのである。For this reason, conventionally, heat treatment as in the present invention has not been performed other than box annealing to improve the material quality of steel sheets. However, in the present invention, by performing blasting before heat treatment, the heat treatment time can be significantly shortened, making it possible to carry out the process on a normal continuous line.
次に、本発明方法においては、ブラスト処理と熱処理と
を別のラインで行うこともできる。例えば、ブラスト処
理を連続溶融めっきラインで行い、次いで熱処理を別の
、例えば連続塗装ラインで行う方法でもよい。この連続
塗装ラインは、上記めっき鋼板に所定の塗装を施し、焼
付は処理するラインである。この処理を経たものは、プ
レコート調板として広く市販されている。このラインで
の前記焼付は処理は、塗料の種類によって異なるが、通
常２００〜３００″Ｃの温度で行われる処理である。Next, in the method of the present invention, the blasting treatment and the heat treatment can be performed on separate lines. For example, the blasting process may be performed in a continuous hot-dip plating line, and then the heat treatment may be performed in another, for example, a continuous painting line. This continuous coating line is a line that applies a predetermined coating to the plated steel sheet and processes the baking process. Products that have undergone this treatment are widely commercially available as pre-coated boards. The baking process in this line varies depending on the type of paint, but is usually carried out at a temperature of 200 to 300''C.
したがって、プレコート調板の製造ラインにおける焼付
は処理で、前記熱処理に代えることができる。いわゆる
、本発明の前記熱処理を、塗装後の焼付は処理に合わせ
て行うことができる。Therefore, baking in the production line of the pre-coated tone plate is a treatment that can be replaced with the heat treatment. In the so-called heat treatment of the present invention, baking after painting can be performed in accordance with the treatment.
なお、本発明方法は、これまでに述べた好適例（Ｚｎ５
５％Ａｔ合金めっき）に限らず、全てのＺｎ高八へ合金
めっき鋼板に適用できる。また、銅板に限らず、例えば
鋼線など、あらゆる形状のＺｎ−Ａｌ合金めっき鋼材へ
の適用も可能である。Note that the method of the present invention is applicable to the preferred example (Zn5
It can be applied not only to 5% At alloy plating but also to all Zn high alloy plated steel sheets. Furthermore, the invention is not limited to copper plates, but can also be applied to Zn-Al alloy plated steel materials of any shape, such as steel wires.
〔実施例）
板厚Ｑ 、 ４ ｍｍ 、付着量８０ｇ／ｎ”のＺｎ
５５ｗｔ％Ａ］−１．６％Ｓｉ−残部Ｚｎのめっき層
を有する鋼板（Ｚｎ−高Ａｌ合金めっき：ＧＬ）につい
て、本発明方法に従う条件、それ以外の条件で処理した
本発明材、比較材について、それぞれの加工性を試験し
た。第３表に処理条件と１を曲げ試験での加工性評価結
果を示す。[Example] Plate thickness Q, 4 mm, Zn coating amount 80 g/n''
55wt%A]-1.6%Si-Remaining Zn steel plate (Zn-high Al alloy plating: GL), the present invention material and comparative material treated under conditions according to the present invention method and other conditions The processability of each was tested. Table 3 shows the processing conditions and the workability evaluation results in the bending test.
この第３表に示す結果から明らかなように、本発明方法
以外の条件で処理した比較例の鋼板（Ｎｌｌ１１、２．
３．６．７．８．９．１０．１３．１４）は、無処理の
鋼板（隘１）に比べて、何れも加工性改善効果が小さい
のに対し、本発明方法に従って処理した鋼板（ＮＣＬ
４．５． Ｉｌ、 １２＞は、加工性改善効果が著しい
ことが判った。As is clear from the results shown in Table 3, steel plates of comparative examples (Nll11, 2.
3.6.7.8.9.10.13.14) had a smaller workability improvement effect than the untreated steel plate (1), whereas the steel plate treated according to the method of the present invention (1) N.C.L.
4.5. It was found that Il, 12> had a remarkable effect of improving workability.
第
３表
注）
加工性評価基準
◎：殆どクラック無し
△：クラック有り
××：深いクラック有り
○：僅かに浅いクラック有り
×：深いクランク有り
（１部剥離有り）
〔発明の効果〕
以上説明したように本発明によれば、次のような効果が
期待できるものである。Table 3 Note) Workability evaluation criteria ◎: Almost no cracks △: Cracks XX: Deep cracks ○: Slightly shallow cracks ×: Deep cranks (with some peeling) [Effects of the invention] As explained above According to the present invention, the following effects can be expected.
（イ）加工性が短時間の熱処理で著しく改善される。(a) Workability is significantly improved by short-term heat treatment.
（ロ）熱処理時間が短いので、連続ラインでの実施が可
能である。(b) Since the heat treatment time is short, it can be carried out on a continuous line.
（ハ）熱処理温度は１５０〜２７０℃の範囲であるので
、熱処理は塗装後の焼付は処理で代えることができる。(c) Since the heat treatment temperature is in the range of 150 to 270°C, baking after painting can be replaced by heat treatment.
（＝）さらに、以上の効果より、Ｚｎ−Ａｌ合金めっき
鋼板の加工性改善コストを大幅に低減できる。(=)Furthermore, due to the above effects, the cost for improving the workability of Zn-Al alloy plated steel sheets can be significantly reduced.
第１図は、Ｚｎ−高ＡＩ合金めっき鋼板を単に熱処理し
ただけの場合の、熱処理温度と時間、加工性（Ｉｔ曲げ
試験結果）の関係を示すグラフ、第２図は、ブラスト処
理を施した後、さらに第１図と同一の条件で熱処理をも
施したＺｎ−高ＡＩ合金めっき鋼板についての加工性調
査結果（ｉｔ曲げ試験結果）を示すグラフである。
第１図、第２図中の符号の意味は次のとおりである。
◎
○
△
×
××：
殆どクランク無し
僅かに浅いクラック有り
クランク有り
深いクラック有り
深いクラック有り（一部剥離あり）Figure 1 is a graph showing the relationship between heat treatment temperature, time, and workability (It bending test results) when a Zn-high AI alloy coated steel sheet is simply heat treated. 2 is a graph showing workability investigation results (IT bending test results) for a Zn-high AI alloy plated steel sheet that was further heat treated under the same conditions as in FIG. 1. The meanings of the symbols in FIGS. 1 and 2 are as follows. ◎ ○ △ × ××: Almost no crank, slightly shallow cracks, cranks, deep cracks, deep cracks (some peeling)
Claims (3)
面をブラスト処理し、次いでこのめっき鋼板に低温短時
間の熱処理を行うことを特徴とする加工性に優れたＺｎ
−高Ａｌ合金めっき鋼板の製造方法。1. Zn with excellent workability, characterized by blasting the plated surface of a Zn-high Al alloy plated steel plate, and then subjecting the plated steel plate to low-temperature, short-time heat treatment.
- A method for producing a high Al alloy plated steel sheet.
０分以内の条件で行うことを特徴とする請求項１に記載
のＺｎ−高Ａｌ合金めっき鋼板の製造方法。2. The above low-temperature heat treatment was performed at a temperature of 150 to 270°C.
2. The method for manufacturing a Zn-high Al alloy plated steel sheet according to claim 1, wherein the manufacturing method is carried out under conditions of 0 minutes or less.
Ａｌ合金めっき鋼板の片面もしくは両面に施す塗装後の
、焼付け処理に合わせて行うことを特徴とする請求項１
に記載のＺｎ−高Ａｌ合金めっき鋼板の製造方法。3. Claim 1, wherein the low-temperature heat treatment is carried out in conjunction with a baking treatment after painting that is applied to one or both sides of a Zn-high Al alloy plated steel sheet that has been subjected to a blast treatment.
A method for manufacturing a Zn-high Al alloy plated steel sheet as described in .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14860690A JPH0441657A (en) | 1990-06-08 | 1990-06-08 | Production of zn-high al alloy plated steel sheet excellent in workability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14860690A JPH0441657A (en) | 1990-06-08 | 1990-06-08 | Production of zn-high al alloy plated steel sheet excellent in workability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0441657A true JPH0441657A (en) | 1992-02-12 |
Family
ID=15456535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14860690A Pending JPH0441657A (en) | 1990-06-08 | 1990-06-08 | Production of zn-high al alloy plated steel sheet excellent in workability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0441657A (en) |
-
1990
- 1990-06-08 JP JP14860690A patent/JPH0441657A/en active Pending
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