JP5504854B2 - Hot pressed member and method for manufacturing the same - Google Patents
Hot pressed member and method for manufacturing the same Download PDFInfo
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- JP5504854B2 JP5504854B2 JP2009275413A JP2009275413A JP5504854B2 JP 5504854 B2 JP5504854 B2 JP 5504854B2 JP 2009275413 A JP2009275413 A JP 2009275413A JP 2009275413 A JP2009275413 A JP 2009275413A JP 5504854 B2 JP5504854 B2 JP 5504854B2
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Description
本発明は、加熱された鋼板をプレス加工して製造する熱間プレス部材、特に、自動車の足廻り部や車体構造部などで用いられる熱間プレス部材およびその製造方法に関する。 The present invention relates to a hot press member manufactured by press-working a heated steel plate, and more particularly to a hot press member used in an undercarriage part or a vehicle body structure part of an automobile and a manufacturing method thereof.
従来から、自動車の足廻り部材や車体構造部材などの多くは、所定の強度を有する鋼板をプレス加工して製造されている。近年、地球環境の保全という観点から、自動車車体の軽量化が熱望され、使用する鋼板を高強度化して、その板厚を低減する努力が続けられている。しかし、鋼板の高強度化に伴ってそのプレス加工性が低下するため、鋼板を所望の部材形状に加工することが困難になる場合が多くなっている。 2. Description of the Related Art Conventionally, many undercarriage members and body structure members of automobiles are manufactured by pressing a steel plate having a predetermined strength. In recent years, from the viewpoint of the preservation of the global environment, there has been a strong desire to reduce the weight of automobile bodies, and efforts have been made to increase the strength of steel sheets to be used and to reduce their thickness. However, as the strength of the steel plate increases, the press workability decreases, and it is often difficult to process the steel plate into a desired member shape.
そのため、特許文献1には、ダイとパンチからなる金型を用いて加熱された鋼板を加工すると同時に急冷することにより加工の容易化と高強度化の両立を可能にした熱間プレスと呼ばれる加工技術が提案されている。しかし、この熱間プレスでは、熱間プレス前に鋼板を950℃前後の高い温度に加熱するため、鋼板表面にはスケール(Fe酸化物)が生成し、そのスケールが熱間プレス時に剥離して、金型を損傷させる、または熱間プレス後の部材表面を損傷させるという問題がある。また、部材表面に残ったスケールは、外観不良、塗装密着性の低下、耐食性の低下などの原因にもなる。このため、通常は酸洗やショットブラストなどの処理を行って部材表面のスケールは除去されるが、これは製造工程を複雑にし、生産性の低下を招く。 Therefore, Patent Document 1 describes a process called a hot press that enables both easy processing and high strength by simultaneously processing a heated steel sheet using a die and punch die and simultaneously cooling it. Technology has been proposed. However, in this hot press, the steel sheet is heated to a high temperature of around 950 ° C before hot pressing, so scale (Fe oxide) is generated on the steel sheet surface and the scale peels off during hot pressing. There is a problem that the mold is damaged or the surface of the member after hot pressing is damaged. In addition, the scale remaining on the surface of the member may cause poor appearance, poor paint adhesion, and corrosion resistance. For this reason, the scale on the surface of the member is usually removed by processing such as pickling or shot blasting, but this complicates the manufacturing process and causes a decrease in productivity.
このようなことから、熱間プレス前の加熱時にスケールの生成を抑制でき、塗装密着性や耐食性に優れた熱間プレス部材が要望され、表面にめっき層などの被膜を設けた鋼板を用いた熱間プレス部材およびその製造方法が提案されている。例えば、特許文献2には、合金化溶融Znめっき鋼板を700〜1000℃で2〜20分間加熱してから熱間プレス加工を行って、表面にFe-Zn固溶相を含むめっき層を形成させた耐食性や溶接性に優れた熱間プレス成形品(部材)が開示されている。また、特許文献3には、シラノール基を有するシリコーン樹脂皮膜で被覆された溶融Znめっき鋼板をAc3変態点以上に加熱してから熱間プレスを行って製造したりん酸塩処理性、塗装密着性およびZn揮発抑制性に優れた熱間プレス成形材(部材)が開示されている。 For this reason, the production of scale during heating prior to hot pressing can be suppressed, and a hot press member excellent in coating adhesion and corrosion resistance is desired, and a steel plate provided with a coating such as a plating layer on the surface is used. A hot press member and a manufacturing method thereof have been proposed. For example, in Patent Document 2, the alloyed hot-dip Zn-plated steel sheet is heated at 700 to 1000 ° C. for 2 to 20 minutes and then hot pressed to form a plated layer containing a Fe—Zn solid solution phase on the surface. A hot press-formed product (member) excellent in corrosion resistance and weldability is disclosed. In addition, Patent Document 3 discloses a phosphate treatment property and coating adhesion produced by hot-pressing a hot-dip Zn-plated steel sheet coated with a silicone resin film having a silanol group to the Ac 3 transformation point or higher. A hot press-molded material (member) having excellent properties and Zn volatilization suppression properties is disclosed.
しかしながら、特許文献2に記載の熱間プレス部材では、塗装密着性に著しく劣るという問題がある。また、特許文献3に記載の熱間プレス部材でも、必ずしも優れた塗装密着性が得られないという問題がある。 However, the hot press member described in Patent Document 2 has a problem that the coating adhesion is remarkably inferior. Further, even with the hot press member described in Patent Document 3, there is a problem that excellent paint adhesion cannot always be obtained.
本発明は、優れた塗装密着性が確実に得られる熱間プレス部材およびその製造方法を提供することを目的とする。 An object of this invention is to provide the hot press member and its manufacturing method in which the outstanding coating adhesiveness is acquired reliably.
本発明者らは、上記の目的とする熱間プレス部材について鋭意検討を行った結果、以下の知見を得た。 As a result of intensive studies on the above-mentioned hot press member, the present inventors have obtained the following knowledge.
i) 耐食性を確保するには、部材を構成する鋼板の表面にAl-Fe合金層を設けることが効果的である。 i) In order to ensure corrosion resistance, it is effective to provide an Al—Fe alloy layer on the surface of the steel plate constituting the member.
ii) このAl-Fe合金層上にSi含有層を介してZnO層を設けると、優れた塗装密着性が確実に得られる。 ii) When a ZnO layer is provided on this Al—Fe alloy layer via a Si-containing layer, excellent coating adhesion can be obtained with certainty.
本発明は、このような知見に基づきなされたもので、部材を構成する鋼板の表面に、順に、Al-Fe合金層、Si含有層、ZnO層を有することを特徴とする熱間プレス部材を提供する。 The present invention has been made on the basis of such knowledge, and a hot pressed member characterized by having an Al-Fe alloy layer, a Si-containing layer, and a ZnO layer in this order on the surface of the steel sheet constituting the member. provide.
本発明の熱間プレス部材は、表面にSi含有化合物層を有するZn-Al合金めっき鋼板を800〜1000℃で3分超え15分以下加熱して熱間プレスを行うことにより製造できる。 The hot-pressed member of the present invention can be produced by hot-pressing a Zn-Al alloy-plated steel sheet having a Si-containing compound layer on the surface at 800 to 1000 ° C. for more than 3 minutes and not more than 15 minutes.
本発明により、優れた塗装密着性が確実に得られる熱間プレス部材を製造できるようになった。本発明の熱間プレス部材は、自動車の足廻り部材や車体構造部材に好適である。 According to the present invention, it has become possible to manufacture a hot press member that can reliably obtain excellent paint adhesion. The hot press member of the present invention is suitable for an automobile suspension member and a vehicle body structural member.
1) 熱間プレス部材
図1(a)や図1(b)に示すように、本発明例である熱間プレス部材には、部材を構成する鋼板の表面に、順に、Al-Fe合金層、Si含有層、ZnO層が設けられている。
1) Hot-pressed member As shown in FIGS. 1 (a) and 1 (b), the hot-pressed member according to the present invention example has an Al-Fe alloy layer in order on the surface of the steel plate constituting the member. A Si-containing layer and a ZnO layer are provided.
部材を構成する鋼板の表面直上にAl-Fe合金層を設けると優れた耐食性が得られる。これは、Al-Fe合金層の腐食電位が鋼に対する犠牲防食効果を有する範囲にあるためと考えられる。なお、Al-Fe合金層の厚みは5〜50μmが好ましく、鋼板断面を光学顕微鏡、SEM(Scanning Electron Microscopy)、EPMA(Electron Probe Micro Analyzer)などにより観察することにより測定可能である。また、Al-Fe合金層は、Al-Fe金属間化合物でもよく、あるいはAlが固溶したFe、またはFeが固溶したAlでもよく、AlとFeの両者が同一領域に存在してさえいればその構造は問わない。AlとFeの両者が同一領域に存在していることの確認は、鋼板断面埋込みしたサンプルを、SEMまたはEPMAによって点分析あるいは面分析することによって確認可能である。 When an Al—Fe alloy layer is provided immediately above the surface of the steel plate constituting the member, excellent corrosion resistance can be obtained. This is presumably because the corrosion potential of the Al—Fe alloy layer is in a range having a sacrificial anticorrosive effect on the steel. The thickness of the Al—Fe alloy layer is preferably 5 to 50 μm, and can be measured by observing the cross section of the steel sheet with an optical microscope, SEM (Scanning Electron Microscopy), EPMA (Electron Probe Micro Analyzer) or the like. In addition, the Al-Fe alloy layer may be an Al-Fe intermetallic compound, or may be Fe in which Al is dissolved, or Al in which Fe is dissolved, and both Al and Fe may exist in the same region. The structure does not matter. Confirmation that both Al and Fe are present in the same region can be confirmed by point analysis or surface analysis of the sample embedded in the cross section of the steel sheet by SEM or EPMA.
このAl-Fe合金層上にSi含有層を介してZnO層を設けると優れた塗装密着性が確実に得られる。これは、次のように考えられる。すなわち、ZnO層は、塗装下地処理時に形成される化成処理皮膜との密着性に優れるが、Al-Fe合金層との密着性に劣るため、Al-Fe合金層上に直接設けられても優れた塗装密着性が得られない。そこで、ZnO層とAl-Fe合金層の両層との密着性に優れるSi含有層を両層の間に設ければ優れた塗装密着性が得られることになる。 When a ZnO layer is provided on this Al—Fe alloy layer via a Si-containing layer, excellent coating adhesion can be obtained with certainty. This is considered as follows. In other words, the ZnO layer is excellent in adhesion with the chemical conversion coating formed during the coating base treatment, but is inferior in adhesion with the Al-Fe alloy layer, so it is excellent even if it is provided directly on the Al-Fe alloy layer. Paint adhesion cannot be obtained. Therefore, if a Si-containing layer having excellent adhesion between the ZnO layer and the Al—Fe alloy layer is provided between the two layers, excellent coating adhesion can be obtained.
なお、Al-Fe合金層上にSi含有層を介して設けたZnO層は、図1(a)に示すように連続層であっても、図1(b)に示すように不連続(島状)層であってもよいが、図2に示すようにAl-Fe合金層と接するように設けられていると塗装密着性の劣化を招く。 Note that even if the ZnO layer provided on the Al-Fe alloy layer via the Si-containing layer is a continuous layer as shown in Fig. 1 (a), it is discontinuous (island as shown in Fig. 1 (b)). However, if it is provided in contact with the Al—Fe alloy layer as shown in FIG. 2, the coating adhesion deteriorates.
Si含有層の厚みは0.5〜5μm、ZnO層の厚みは0.1〜10μmであることが好ましく、鋼板断面を光学顕微鏡、SEM、EPMAなどにより観察することにより測定可能である。 The thickness of the Si-containing layer is preferably 0.5 to 5 μm, and the thickness of the ZnO layer is preferably 0.1 to 10 μm, and can be measured by observing the cross section of the steel sheet with an optical microscope, SEM, EPMA, or the like.
2) 製造方法
上述したように、本発明の熱間プレス部材は、表面にSi含有化合物層を有するZn-Al合金めっき鋼板を800〜1000℃で3分超え15分以下加熱して熱間プレスを行うことにより製造できる。
2) Manufacturing method As described above, the hot press member of the present invention is a hot press by heating a Zn-Al alloy plated steel sheet having a Si-containing compound layer on the surface at 800 to 1000 ° C. for more than 3 minutes and not more than 15 minutes. It can manufacture by performing.
表面にSi含有化合物層を有するZn-Al合金めっき鋼板を800〜1000℃で加熱することにより、めっき層と下地鋼板の界面ではめっき層中のAlと鋼板中のFeが相互拡散し、Al-Fe合金層が形成される。また、めっき層にあるZnはSi含有化合物層を通過して表面まで拡散し、雰囲気中のOと反応して、図1(a)や図1(b)に示すようにSi含有層上にZnO層が形成される。このとき、Znと雰囲気中のOとの反応は均一には生じにくいため、加熱時間が3分以下の反応初期では局部的にZnOが激しく生成し、図2に示すようなSi含有層中にZnO層が混在し、ZnO層とAl-Fe層の接触部が形成される。しかし、3分を超えて加熱するとSi含有層が脱水縮合反応等によって層状化が進み、図1(a)や図1(b)に示すようなZnO層とAl-Fe層の接触部がない状態となる。 By heating a Zn-Al alloy-plated steel sheet having a Si-containing compound layer on the surface at 800 to 1000 ° C., Al in the plating layer and Fe in the steel sheet are interdiffused at the interface between the plating layer and the base steel sheet. An Fe alloy layer is formed. Also, Zn in the plating layer diffuses to the surface through the Si-containing compound layer, reacts with O in the atmosphere, and on the Si-containing layer as shown in FIGS. 1 (a) and 1 (b). A ZnO layer is formed. At this time, since the reaction between Zn and O in the atmosphere is difficult to occur uniformly, ZnO is locally generated intensely at the initial stage of the reaction with a heating time of 3 minutes or less, and in the Si-containing layer as shown in FIG. A ZnO layer is mixed, and a contact portion between the ZnO layer and the Al—Fe layer is formed. However, when heated for more than 3 minutes, the Si-containing layer is stratified by a dehydration condensation reaction, etc., and there is no contact portion between the ZnO layer and the Al-Fe layer as shown in FIGS. 1 (a) and 1 (b) It becomes a state.
なお、800℃未満の加熱ではSi含有層の層状化が不十分であり、図2に示すようなZnO層とAl-Fe層の接触部が形成される。1000℃以上に加熱するとZnの蒸発が激しくなり、局部的にZnOが激しく生成し、同様に図2に示すようなZnO層とAl-Fe層の接触部が形成される。また、15分を超えて加熱してもSi含有層の層状化の効果は飽和し、コスト増や生産性の低下を招く。 Note that when the heating is less than 800 ° C., the layering of the Si-containing layer is insufficient, and a contact portion between the ZnO layer and the Al—Fe layer as shown in FIG. 2 is formed. When heated to 1000 ° C. or higher, the evaporation of Zn becomes violent, and ZnO is locally generated vigorously. Similarly, a contact portion between the ZnO layer and the Al—Fe layer as shown in FIG. 2 is formed. Moreover, even if it is heated for more than 15 minutes, the effect of layering the Si-containing layer is saturated, resulting in an increase in cost and a decrease in productivity.
780MPa以上の強度を有する熱間プレス部材を得るには、本発明に用いるZn-Al合金めっき鋼板の下地鋼板として、例えば、質量%で、、C:0.1〜0.5%、Si:0.05〜2.0%、Mn:0.5〜3%、P:0.1%以下、S:0.05%以下、Al:0.1%以下、N:0.01%以下、Cr:0.4〜0.5%、B:0.0015〜0.0025%を含有し、残部がFeおよび不可避的不純物からなる成分組成を有する鋼板を用いることが好ましい。なお、必要に応じて、Ti、Nb、Mo、V、Ni、Cu、Wのうちの少なくとも1種を含有させることができる。 In order to obtain a hot pressed member having a strength of 780 MPa or more, as a base steel plate of a Zn-Al alloy plated steel plate used in the present invention, for example, in mass%, C: 0.1 to 0.5%, Si: 0.05 to 2.0% , Mn: 0.5-3%, P: 0.1% or less, S: 0.05% or less, Al: 0.1% or less, N: 0.01% or less, Cr: 0.4-0.5%, B: 0.0015-0.0025%, the balance It is preferable to use a steel plate having a component composition consisting of Fe and inevitable impurities. If necessary, at least one of Ti, Nb, Mo, V, Ni, Cu, and W can be contained.
下地鋼板上のZn-Al合金めっき層の組成は特に限定されず、公知の組成がすべて適用可能であるが、Alが50〜60質量%含有される組成が特に好適である。Zn-Al合金めっき層の片面あたりの付着量についても、通常広く用いられている30〜90g/m2を適用できる。Zn-Al合金めっき層の形成方法については、公知の方法がすべて適用可能であるが、溶融めっき浴に浸漬した後に浴から引き上げて付着量の調整を行う方法が特に好ましい。 The composition of the Zn—Al alloy plating layer on the base steel plate is not particularly limited, and all known compositions can be applied, but a composition containing 50 to 60% by mass of Al is particularly suitable. Also about the adhesion amount per one side of a Zn-Al alloy plating layer, 30-90 g / m < 2 > generally used widely can be applied. As a method for forming the Zn—Al alloy plating layer, all known methods can be applied, but a method of adjusting the adhesion amount by pulling up from the bath after being immersed in a hot dipping bath is particularly preferable.
Zn-Al合金めっき鋼板上のSi含有化合物層としては、例えば、シリコーン樹脂、リチウムシリケート、コロイダルシリカ、シランカップリング剤などからなる層を挙げられる。また、こうしたSi含有化合物層を形成するには、ロールコーター、スクイズコーター、ダイコーターなどによる塗布法、浸漬法、スプレー法などを用いてSi含有化合物を塗布後、加熱乾燥すればよい。このとき、スクイズコーターなどによる塗布処理、浸漬処理、スプレー処理の後に、エアナイフ法やロール絞り法により塗布量の調整、外観の均一化、付着量の均一化を行うことも可能である。また、加熱乾燥にはドライヤー、熱風炉、高周波誘導加熱炉、赤外線炉などを用いることができるが、その温度は到達板温で40〜200℃が好ましく、50〜160℃がより好ましい。この到達板温を40℃以上とするとSi含有化合物層中に溶剤や水分などの溶媒が残存することがなく、塗装密着性が十分となる。また、到達板温を200℃以下とすると経済的であるばかりでなく、Si含有化合物層に欠陥が生じることがなく、塗装密着性が向上する。 Examples of the Si-containing compound layer on the Zn—Al alloy-plated steel sheet include a layer made of a silicone resin, lithium silicate, colloidal silica, a silane coupling agent, and the like. In order to form such a Si-containing compound layer, the Si-containing compound may be applied using a roll coater, a squeeze coater, a die coater, a coating method, a dipping method, a spray method, or the like, and then dried by heating. At this time, it is also possible to adjust the coating amount, make the appearance uniform, and make the adhesion amount uniform by an air knife method or roll drawing method after the coating treatment, dipping treatment, and spraying treatment with a squeeze coater. In addition, a dryer, a hot air furnace, a high-frequency induction heating furnace, an infrared furnace, or the like can be used for heat drying, and the temperature is preferably 40 to 200 ° C., more preferably 50 to 160 ° C. in terms of ultimate plate temperature. When the ultimate plate temperature is 40 ° C. or higher, a solvent such as a solvent or moisture does not remain in the Si-containing compound layer, and coating adhesion is sufficient. Further, when the ultimate plate temperature is set to 200 ° C. or less, it is not only economical, but also defects in the Si-containing compound layer do not occur, and coating adhesion is improved.
Si含有化合物層の片面あたりの付着量は、0.5g/m2以上とすると塗装密着性を十分に向上でき、5.0g/m2以下とするとSi含有化合物層が脆くなることがなく、塗装密着性が向上するので、0.5〜5.0g/m2が好ましい。 If the adhesion amount per side of the Si-containing compound layer is 0.5 g / m 2 or more, the coating adhesion can be sufficiently improved, and if it is 5.0 g / m 2 or less, the Si-containing compound layer does not become brittle and the coating adhesion From the standpoint of improving the properties, 0.5 to 5.0 g / m 2 is preferable.
なお、Si含有層とその下層のAl-Fe合金層の密着性をさらに向上させる目的で、Si含有層の下層に複合酸化物皮膜を設けることができる。それには、例えば、Zn-Al合金めっき鋼板にSi含有化合物層を形成する前に、シリカなどの酸化物微粒子、リン酸および／またはリン酸化合物、MnやAlなどの金属成分、のうち少なくとも1種を含有する複合酸化物皮膜を片面あたり5〜4000mg/m2形成すればよい。 For the purpose of further improving the adhesion between the Si-containing layer and the underlying Al—Fe alloy layer, a composite oxide film can be provided in the lower layer of the Si-containing layer. For example, before forming the Si-containing compound layer on the Zn-Al alloy plated steel sheet, at least one of oxide fine particles such as silica, phosphoric acid and / or phosphoric acid compound, metal components such as Mn and Al, and the like. What is necessary is just to form 5 to 4000 mg / m < 2 > of single-sided composite oxide films containing seeds.
素材の鋼板として、質量%で、C:0.23%、Si:0.12%、Mn:1.5%、P:0.02%、S:0.002%、Al:0.03%、N:0.002%、Cr:0.4%、B:0.0022%を含み、残部がFeおよび不可避的不純物からなる組成を有する板厚1.6mmの冷延鋼板に、Alを55質量%含有したZn-Al合金めっき層を、表1に示す片面あたりのめっき付着量で両面に形成したZn-Al合金めっき鋼板を用いた。まず、これらのZn-Al合金めっき鋼板に、表1に示すSi含有化合物を塗布後、到達板温が140℃となる条件で乾燥し、表1に示す片面あたりの付着量のSi含有化合物層を両面に形成した。次に、Si含有化合物層を形成した鋼板から200mm×220mmのブランクを採取し、大気雰囲気の電気炉内で表1に示す加熱条件(到達板温、時間)で加熱後、炉内から取り出し、直ちに図3に模式的に示したようなプレス方法で絞り加工し、熱間プレス部材No.1〜17を作製した。このとき、ポンチ幅は70mm、加工高さは30mmとした。そして、部材頭部の平坦部から試料を採取し、非ポンチ接触面の厚み方向断面の層構造をSEMにより調査した。また、次の方法により非ポンチ接触面の塗装密着性を調査した。
塗装密着性：部材頭部の平坦部から試料を採取し、日本パーカライジング株式会社製PB-L3020を使用して標準条件で化成処理を施した後、関西ペイント株式会社製GT-10を膜厚20μm電着塗装して試験片を作製した。そして、作製した試験片に対してカッターナイフで鋼素地まで達する1mm角の碁盤目状傷を100個入れ、セロハン粘着テープにより貼着・剥離する碁盤目テープ剥離試験を行った。以下の基準で評価し、○であれば本発明の目的を満足しているとした。
○：塗膜残存率=100%
△：70%≦塗膜残存率<100%
×：塗膜残存率<70%
結果を表1に示す。本発明である熱間プレス部材No.1〜12は、塗装密着性に優れていることがわかる。
As a steel plate of material, C: 0.23%, Si: 0.12%, Mn: 1.5%, P: 0.02%, S: 0.002%, Al: 0.03%, N: 0.002%, Cr: 0.4%, B : A cold rolled steel sheet with a thickness of 1.6 mm containing 0.0022% and the balance consisting of Fe and inevitable impurities, a Zn-Al alloy plating layer containing 55% by mass of Al, per one side shown in Table 1 A Zn-Al alloy plated steel sheet formed on both sides with a coating weight was used. First, after applying the Si-containing compound shown in Table 1 to these Zn-Al alloy-plated steel sheets, the sheet was dried under the condition that the ultimate plate temperature was 140 ° C., and the amount of Si-containing compound layer per one side shown in Table 1 Was formed on both sides. Next, a blank of 200 mm × 220 mm was collected from the steel sheet on which the Si-containing compound layer was formed, and after heating under the heating conditions (attainment plate temperature, time) shown in Table 1 in an electric furnace in the air atmosphere, it was taken out from the furnace, Immediately, drawing was performed by a pressing method as schematically shown in FIG. 3, and hot pressed members No. 1 to 17 were produced. At this time, the punch width was 70 mm and the processing height was 30 mm. And the sample was extract | collected from the flat part of the member head, and the layer structure of the thickness direction cross section of a non-punch contact surface was investigated by SEM. In addition, the paint adhesion of the non-punch contact surface was investigated by the following method.
Paint adhesion: A sample was taken from the flat part of the component head, and after chemical conversion treatment was performed under standard conditions using PB-L3020 manufactured by Nihon Parkerizing Co., Ltd., GT-10 manufactured by Kansai Paint Co., Ltd. was formed to a thickness of 20 μm. A test piece was prepared by electrodeposition coating. Then, 100 cross-cuts of 1 mm square crossing reaching the steel substrate with a cutter knife were put into the prepared test piece, and a cross-cut tape peeling test was performed in which the cellophane adhesive tape was used to stick and peel. Evaluation was made according to the following criteria, and if it was ○, the object of the present invention was satisfied.
○: Coating film remaining rate = 100%
Δ: 70% ≦ residual coating rate <100%
×: Residual rate of coating film <70%
The results are shown in Table 1. It turns out that hot press member No. 1-12 which is this invention is excellent in coating adhesiveness.
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