JPH10280116A - Surface-treated steel sheet excellent in rusting-resistance edge face, its production and cutting of surface-treated mother steel sheet - Google Patents
Surface-treated steel sheet excellent in rusting-resistance edge face, its production and cutting of surface-treated mother steel sheetInfo
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- JPH10280116A JPH10280116A JP8503597A JP8503597A JPH10280116A JP H10280116 A JPH10280116 A JP H10280116A JP 8503597 A JP8503597 A JP 8503597A JP 8503597 A JP8503597 A JP 8503597A JP H10280116 A JPH10280116 A JP H10280116A
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- steel sheet
- face
- thickness
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- ratio
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Abstract
Description
【0001】[0001]
【発明の属する技術分野】この発明は、家電、建材、事
務機器等の部材として供される、亜鉛系めっきを施した
表面処理鋼板に関し、特に剪断加工機による切断端面の
耐錆性に優れる表面処理鋼板、その製造方法および表面
処理母鋼板の切断方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zinc-plated surface-treated steel sheet to be used as a member of household appliances, building materials, office equipment, etc., and more particularly to a surface having excellent rust resistance of a cut end face by a shearing machine. The present invention relates to a treated steel sheet, a method for producing the same, and a method for cutting a surface-treated mother steel sheet.
【0002】[0002]
【従来の技術】亜鉛系めっき、すなわち、Zn単独のほ
か、Zn−Ni,Zn−Fe,Zn−Al,Zn−C
r,Zn−Ni−Co,Zn−Al−Crなどの2元合
金、多元合金を含む各種のめっきを施した表面処理鋼板
は、優れた耐食性を有していることから、家電、建材、
事務機器等の製品の部材として広く使用されている。こ
れら製品の部材は、その生産工程で、亜鉛系めっきを施
した表面処理母鋼板(切断加工前の鋼板を母鋼板とす
る)に、上下一対の工具を備えた剪断加工機により、剪
断、打ち抜き(ブランキング)、穴あけ(パンチン
グ)、縁取り(トリミング)など何らかの切断加工を行
い、切断によって得られた表面処理鋼板を、必要に応じ
て、所定の形状に成形して製造される。2. Description of the Related Art Zinc-based plating, that is, in addition to Zn alone, Zn-Ni, Zn-Fe, Zn-Al, Zn-C
r, Zn-Ni-Co, Zn-Al-Cr and other surface-treated steel sheets that have been subjected to various types of plating including binary alloys and multi-element alloys have excellent corrosion resistance.
It is widely used as a component of products such as office equipment. In the production process, the components of these products are sheared and punched by a shearing machine equipped with a pair of upper and lower tools on a zinc-plated surface-treated mother steel sheet (the steel sheet before cutting is used as the mother steel sheet). It is manufactured by performing some kind of cutting processing such as (blanking), drilling (punching), and trimming (trimming), and forming the surface-treated steel sheet obtained by the cutting into a predetermined shape as necessary.
【0003】ところで、従来、これらの表面処理鋼板
は、製品に一旦使用されると、ユーザーから粗大ゴミと
して廃棄されるか、解体しスクラップ化されるのが一般
的であった。これに対し、最近では、限界にきた地方自
治体における廃棄物処分場の問題から、あるいはまた、
省資源や省エネルギーをはかり、地球環境を保護する立
場から、製品部材を、鉄資源として回収再利用するのみ
ならず、その一部を原形を保ったまま回収して、より付
加価値を高めて再利用する気運が高まりつつある。この
ような情勢の下で、近い将来、製造者自らが、販売した
製品をそのまま、あるいはその一部の部材を回収し、再
利用するようになることが予想される。[0003] Conventionally, once these surface-treated steel sheets are used in products, they are generally discarded by users as oversized trash, or dismantled and scrapped. On the other hand, recently, due to the problem of waste disposal sites in local governments that have reached their limits,
From the standpoint of conserving resources and energy, and protecting the global environment, we not only recover and reuse product parts as iron resources, but also recover a part of them in their original form to increase added value. Motivation to use is increasing. Under such circumstances, in the near future, it is expected that manufacturers themselves will recover sold products as they are, or collect and reuse some of the components.
【0004】[0004]
【発明が解決しようとする課題】しかしながら、従来の
表面処理鋼板を使用した各種の製品では、その切断端面
で、使用中に徐々に赤錆が発生し、外観を悪化させるば
かりでなく、上述した再利用には到底適するものではな
かった。さらに、例えば、家電製品の場合には、もし使
用中または回収した部材に端面錆が発生していると、錆
の欠落等による電気的な短絡等も懸念される。However, in various products using conventional surface-treated steel sheets, red rust is gradually generated on the cut end surfaces during use, which not only deteriorates the appearance, but also causes the above-described re-use. It was not at all suitable for use. Furthermore, for example, in the case of household electrical appliances, if end faces are rusted during use or collected, electrical short-circuiting due to lack of rust or the like may be a concern.
【0005】このような切断端面における錆発生の問題
は、特に、表面処理鋼板としてPCM(Precoated Meta
l)鋼板を採用した場合にしばしばみられた。ここに、P
CM鋼板とは、通常、加工メーカーで行う塗装を、母板
の状態で予め塗装を施したものをいい、例えば、亜鉛系
めっきの上に、りん酸塩処理あるいはクロメート処理等
の化成処理を行い、その上に塩化ビニールまたはポリエ
ステルなどの塗装あるいはラミネートを施したものをい
う。このような錆の発生現象は、PCM鋼板では塗装後
に切断加工するため、この加工端面で地鉄が露出し、露
出部の多くは塗装を行わないために起こるものである。
したがって、このような切断端面における錆発生の問題
は、めっきのまま状態はもちろん、めっき後クロム酸処
理などの化成処理を施した場合やPCMのように、鋼板
面に被覆を施したばあいでも、鋼板端面が露出したとき
に、同様に危惧されるものである。[0005] The problem of rust generation on the cut end face is particularly caused by PCM (Precoated Meta) as a surface-treated steel sheet.
l) Frequently observed when steel plates were used. Where P
CM steel sheet is a coating that is usually applied by a processing maker and is pre-coated in the state of a mother plate. For example, a chemical conversion treatment such as a phosphate treatment or a chromate treatment is performed on zinc-based plating. , And those coated or laminated with vinyl chloride or polyester. Such a phenomenon of rust occurs because the PCM steel sheet is cut after coating, and the base iron is exposed at the processed end face, and most of the exposed portions are not coated.
Therefore, such a problem of rust generation on the cut end face is caused not only in a state of plating, but also in a case where a chemical conversion treatment such as chromic acid treatment is performed after plating or in a case where a coating is applied to a steel sheet surface like PCM. When the end face of the steel sheet is exposed, it is also concerned.
【0006】そこで、めっき後に、このめっき層の上に
化成処理後に、またはこの化成処理層の上に塗装処理後
に、切断加工を行う場合に、切断ままの状態でも、すな
わち切断加工後に塗装など特別な処理を行わない状態で
も、切断端面での錆が発生しない材料が開発されれば、
上述したような、製品部材の再利用や製品コストの低減
も可能であると期待される。Therefore, when the cutting process is performed after the plating, after the chemical conversion treatment on the plating layer, or after the coating treatment on the chemical conversion treatment layer, even when the cutting process is performed, that is, after the cutting process, a special treatment such as painting is performed. If a material that does not generate rust on the cut end surface is developed even without performing
It is expected that product members can be reused and product cost can be reduced as described above.
【0007】そこで、本発明の目的は、亜鉛系めっきを
施した表面処理鋼板における、従来技術が抱えているこ
のような問題点に鑑み、切断加工端面での、耐錆性に優
れる表面処理鋼板、その製造方法および表面処理母鋼板
の切断方法を提供することにある。Accordingly, an object of the present invention is to provide a surface-treated steel sheet having excellent rust resistance at the cut end face in view of the above-mentioned problems of the prior art in a zinc-plated surface-treated steel sheet. And a method of manufacturing the same and a method of cutting a surface-treated mother steel sheet.
【0008】[0008]
【課題を解決するための手段】本発明者らは、上掲の目
的を実現すべく実験, 検討を重ねた結果、切断端面にお
ける錆の発生が、切断面に占める剪断面の比率、Zn目
付量などにより極めて大きく影響を受けることを知見し
た。そして、これらの間の関係を一定の範囲内に制御す
ることにより、端面における耐錆性を、従来の表面処理
鋼板よりも格段に向上させ得るとの結論に達し、この発
明を完成するに至った。その要旨構成は下記のとおりで
ある。As a result of repeated experiments and studies to achieve the above-mentioned object, the inventors of the present invention have found that the generation of rust on the cut end surface is caused by the ratio of the shear surface occupied by the cut surface, and the Zn basis weight. It was found that the amount was greatly affected by the amount. Then, by controlling the relationship between them within a certain range, it was concluded that rust resistance at the end face could be significantly improved as compared with the conventional surface-treated steel sheet, and the present invention was completed. Was. The summary structure is as follows.
【0009】(1) 切断端面の形状が、下記の条件; t2 /(M・RS )≦0.2 ただし、t:板厚(mm)、 M:片面当たりのZn目付量(g/m2 )、 RS :剪断面比率(=剪断面厚み/板厚)を満足するこ
とを特徴とする端面の耐錆性に優れる表面処理鋼板。(1) The shape of the cut end surface is as follows: t 2 / (M · R s ) ≦ 0.2, where t: plate thickness (mm), M: weight per unit area of Zn (g / m 2 ), R s : a surface-treated steel sheet excellent in rust resistance of end faces, characterized by satisfying a shear surface ratio (= shear surface thickness / sheet thickness).
【0010】(2) 亜鉛系めっきを施した表面処理鋼板の
製造にあたり、上下一対の工具により切断するときのそ
の切断端面にしめる剪断面の比率、鋼板の板厚およびZ
n目付量の関係が、下記式; t2 /(M・RS )≦0.2 ただし、t:板厚(mm)、 M:片面当たりのZn目付量(g/m2 )、 RS :剪断面比率(=剪断面厚み/板厚)を満足するよ
うに亜鉛めっき処理し、切断を行うことを特徴とする端
面の耐錆性に優れる表面処理鋼板の製造方法。(2) In the production of a zinc-plated surface-treated steel sheet, the ratio of the shearing surface to be cut to the cut end face when cutting with a pair of upper and lower tools, the thickness of the steel sheet, and the Z
n basis weight relationship, the following formula; t 2 / (M · R S) ≦ 0.2 , however, t: plate thickness (mm), M: Zn basis weight per surface (g / m 2), R S : A method for producing a surface-treated steel sheet having excellent rust resistance at the end face, wherein the steel sheet is galvanized so as to satisfy a shear surface ratio (= shear surface thickness / sheet thickness) and cut.
【0011】(3) 亜鉛系めっきを施した表面処理母鋼板
を上下一対の工具により切断するにあたり、切断端面に
しめる剪断面の比率が、鋼板の板厚およびZn目付量に
応じて、下記式; t2 /(M・RS )≦0.2 ただし、t:板厚(mm)、 M:片面当たりのZn目付量(g/m2 )、 RS :剪断面比率(=剪断面厚み/板厚)を満足するよ
うに上記工具間のクリアランスを調整することを特徴と
する端面の耐錆性に優れる表面処理母鋼板の切断方法。(3) When cutting a zinc-plated surface-treated mother steel sheet with a pair of upper and lower tools, the ratio of the shearing surface to be cut to the cut end face is determined by the following formula according to the thickness of the steel sheet and the basis weight of Zn: t 2 / (M · R s ) ≦ 0.2, where t: plate thickness (mm), M: weight per area of Zn (g / m 2 ), R s : shear surface ratio (= shear surface thickness / A method of cutting a surface-treated mother steel sheet having excellent rust resistance at an end face, wherein a clearance between the tools is adjusted so as to satisfy a sheet thickness).
【0012】(4) 上記(1) において、剪断面比率0.5
〜0.9、片面当たりのZn目付量5g/m2 以上のう
ちの少なくとも一方の条件を満たす表面処理鋼板。(4) In the above (1), the shear surface ratio is 0.5
0.9, at least one condition is satisfied surface treated steel sheet of Zn basis weight 5 g / m 2 or more per side.
【0013】(5) 上記(2) において、剪断面比率0.5
〜0.9、片面当たりのZn目付量5g/m2 以上のう
ちの少なくとも一方の条件を満たす表面処理鋼板の製造
方法。(5) In the above (2), the shear surface ratio is 0.5
0.9 The method of at least one condition is satisfied surface treated steel sheet of Zn basis weight 5 g / m 2 or more per side.
【0014】(6) 上記(3) において、剪断面比率0.5
〜0.9、片面当たりのZn目付量5g/m2 以上のう
ちの少なくとも一方の条件を満たす表面処理母鋼板の切
断方法。なお、上記各発明における表面処理鋼板には、
折り曲げ加工等を施したものも含むものとする。(6) In the above (3), the shear surface ratio is 0.5
0.9, at least one condition is satisfied surface treatment base steel cutting method of the Zn basis weight 5 g / m 2 or more per side. The surface-treated steel sheet in each of the above inventions includes:
It also includes those that have been subjected to bending or the like.
【0015】[0015]
【発明の実施の形態】発明者らは、板厚、切断条件、め
っき条件などを種々の範囲で変化させた実験を行い、切
断端面における錆の発生状況と、分離様式(破断面か剪
断面か、図1参照)、Zn目付量などとの関係を詳細に
調査した。その結果、切断端面の錆は、主に端面の分離
様式が破断面である位置から発生すること、板厚が小さ
いほど端面の錆は少なくなることがわかった。また、切
断端面の錆は、同じ板厚で、分離様式が同じでも、亜鉛
目付量が大きい程発生しにくいことも明らかとなった。
さらに、これら要因間の関係を次式; t2 /(M・RS )≦0.2 ただし、t:板厚(mm)、 M:片面当たりのZn目付量(g/m2 )、 RS :剪断面比率(=剪断面厚み/板厚)で示す一定の
範囲に入るように制御すれば、この錆を普遍的に抑制で
きることを確認した。ここに、Zn目付量は金属Znに
換算した値であるので、合金めっきの場合には合金中の
Zn分のみの目付量を意味する。なお、剪断面比率の定
義は、図1に示すものとする。BEST MODE FOR CARRYING OUT THE INVENTION The inventors carried out experiments in which the plate thickness, cutting conditions, plating conditions, etc. were changed in various ranges, and the state of rust generation on the cut end face and the separation mode (fracture surface or shear surface) And FIG. 1), and the relationship with the basis weight of Zn and the like were investigated in detail. As a result, it was found that the rust on the cut end face mainly occurred from the position where the separation style of the end face was the fractured surface, and that the rust on the end face decreased as the plate thickness became smaller. It was also found that the rust on the cut end surface was less likely to occur as the zinc basis weight increased, even with the same plate thickness and the same separation mode.
Further, the relationship between these factors is expressed by the following formula: t 2 / (M · R S ) ≦ 0.2, where t: plate thickness (mm), M: weight per area of Zn (g / m 2 ), R S : It has been confirmed that this rust can be universally suppressed by controlling so as to be within a certain range represented by a shear surface ratio (= shear surface thickness / plate thickness). Here, the Zn basis weight is a value converted into metallic Zn, and therefore, in the case of alloy plating, it means a basis weight of only Zn in the alloy. The definition of the shear surface ratio is shown in FIG.
【0016】上記関係式が成立する根拠は次のように定
性的に説明されると考えている。切断時の分離様式が破
断面の場合には、亜鉛めっきが存在していないため、切
断端面に結露等による水が付着すると、腐食反応がはじ
まり赤錆が発生する。これに対し、剪断面にはめっき相
にあったZnが持ち来たらされて、この面上に亜鉛が存
在して、犠牲防食作用をもたらすため、赤錆が発生しな
くなる。ただし、この場合に、剪断面におけるZnの存
在量により、破断面への犠牲防食性の効果が異なり、存
在量が多いほど犠牲防食作用は大きくなる。また、板厚
が大きくなれば、破断面の占める割合が増加し、剪断面
における亜鉛付着部の先端位置からの距離が大きくな
り、犠牲防食作用が及びにくくなる。It is believed that the basis for the above relational expression is qualitatively explained as follows. If the separation mode at the time of cutting is a fractured surface, zinc plating does not exist, and if water due to condensation or the like adheres to the cut end surface, a corrosion reaction starts and red rust is generated. On the other hand, Zn which is in the plating phase is brought to the shearing surface, and zinc is present on this surface to bring about a sacrificial anticorrosion action, so that red rust does not occur. However, in this case, the effect of sacrificial corrosion protection on the fractured surface differs depending on the amount of Zn present in the sheared surface, and the greater the amount, the greater the sacrificial corrosion protection effect. In addition, when the plate thickness is increased, the proportion of the fractured surface increases, the distance from the tip position of the zinc attachment portion in the sheared surface increases, and the sacrificial corrosion prevention effect is hardly achieved.
【0017】上述したように、本発明に従い、上記式で
計算される値が0.2以下になるように、亜鉛系めっき
の目付量、切断時の分離様式を制御することにより、切
断端面における耐錆性に優れる表面処理鋼板を提供でき
る。なお、好適な目付量、剪断面比率の条件として、上
記式を満足したうえ、剪断面比率は0.5〜0.9、よ
り好ましくは0.5〜0.9の範囲が、片面当たりのZ
n目付量は5g/m2 以上が好ましく、このうちの少な
くとも一方の条件を満たすことにより一層耐錆性が向上
する。As described above, according to the present invention, by controlling the basis weight of zinc-based plating and the mode of separation at the time of cutting so that the value calculated by the above equation becomes 0.2 or less, the cut end face A surface-treated steel sheet having excellent rust resistance can be provided. In addition, as a suitable condition of the basis weight and the shear surface ratio, the above expression is satisfied, and the shear surface ratio is in the range of 0.5 to 0.9, more preferably 0.5 to 0.9, per one surface. Z
The n basis weight is preferably 5 g / m 2 or more. By satisfying at least one of these conditions, rust resistance is further improved.
【0018】上記の、剪断面比率の制御は、剪断機にお
ける上下工具間のクリアランスにより行うのがもっとも
容易であるが、このほかにせん断荷重やせん断速度など
の条件を変更したり、精密せん断やシェービングなど加
工方法を変更して行うことも可能である。クリアランス
により剪断面積率を調整した一例を図2に示す。図2
は、低炭素鋼板(C:0.03wt%、Si:0.02wt%、Mn:0.
2 wt%、P:0.02wt%、S:0.01wt%)に、20g/m
2 (片面)の純亜鉛めっき系の両面電気めっきした表面
処理母鋼板を、上工具と下工具間のクリアランスを変化
させて切断し、剪断面比率への影響を調べたものであ
る。この図に示すように、剪断面比率は上下工具間のク
リアランスにより制御可能である。また、図2から、剪
断面比率は板厚によっても大きく影響を受けることがわ
かる。The above-mentioned control of the shearing surface ratio is most easily performed by the clearance between the upper and lower tools in the shearing machine. It is also possible to change the processing method such as shaving. FIG. 2 shows an example in which the shear area ratio is adjusted by the clearance. FIG.
Is a low carbon steel sheet (C: 0.03 wt%, Si: 0.02 wt%, Mn: 0.
2 wt%, P: 0.02 wt%, S: 0.01 wt%) and 20 g / m
2 This is an investigation of the effect on the shear surface ratio of a (single-sided) pure zinc-plated double-sided electroplated surface treated base steel plate with varying clearances between the upper and lower tools. As shown in this figure, the shear surface ratio can be controlled by the clearance between the upper and lower tools. FIG. 2 also shows that the shear surface ratio is greatly affected by the plate thickness.
【0019】なお、本発明に適用される母板の亜鉛系め
っきは、溶融めっき、電気めっき、蒸着めっき等めっき
の手段はいかなる方法によるものでもよく、前述したよ
うな、Zn単一系めっきは勿論のこと、2元系合金めっ
き、それ以上の多元系合金めっきなど、Zn系であれば
とくに制限されることはない。The zinc-based plating of the mother plate applied to the present invention may be performed by any method such as hot-dip plating, electroplating, and vapor deposition plating. Of course, there is no particular limitation as long as it is a Zn-based material such as a binary alloy plating or a multi-component alloy plating.
【0020】また、めっきの対象となるめっき原板も、
特に制限されることなく、本発明を適用することができ
るが、剪断加工時のばり(かえり)を小さくする観点か
らは、低炭素鋼板が望ましく、成分組成としてはC:0.
04wt%以下、Si:0.02wt%以下、Mn:0.3 wt%以下、
P:0.03wt%以下のものが好ましい。Further, the plating original plate to be plated is also:
The present invention can be applied without any particular limitation, but from the viewpoint of reducing burrs during shearing, a low-carbon steel sheet is desirable, and the component composition is C: 0.
04 wt% or less, Si: 0.02 wt% or less, Mn: 0.3 wt% or less,
P: 0.03 wt% or less is preferable.
【0021】[0021]
【実施例】板厚1.0〜2.0mmで、C:0.02〜0.05
wt%、Si:0.01〜0.02wt%、Mn:0.15〜0.30wt%、P:
0.01〜0.03wt%の低炭素鋼板に、目付量10〜60g/
m 2 (片面)の電気亜鉛めっきを施した。次いで、クロ
メート処理を、Cr還元率40%のクロメート液に、液
相シリカをSiO2 /Cr=4になるよう添加したもの
を金属Cr換算で40mg/m2 塗布し、250℃で焼
き付ける方法で行った。このようにして得られた表面処
理母鋼板を、クリアランスを変えられる剪断機を用い、
剪断面比率を変化させ、式t2 /(M・RS )の値を広
い範囲で変化させた。[Example] With a thickness of 1.0 to 2.0 mm, C: 0.02 to 0.05
wt%, Si: 0.01 to 0.02 wt%, Mn: 0.15 to 0.30 wt%, P:
A low carbon steel sheet of 0.01 to 0.03 wt% has a basis weight of 10 to 60 g /
m Two(One side) electrogalvanized. Next,
Mate treatment to a chromate solution with a Cr reduction ratio of 40%
Phase silica with SiOTwo/ Cr = 4 added
Is 40 mg / m in terms of metal CrTwoApply and bake at 250 ° C
It was done in a crisp manner. The surface treatment obtained in this way
Using a shearing machine that can change the clearance,
By changing the shear ratio, the equation tTwo/ (MRS) Value
Was changed within a certain range.
【0022】切断した端面を、目視で観察して分離様式
を調べるとともに、切断端面の耐錆性を調査した。耐錆
性の評価は、切断した表面処理鋼板のサンプルを、20
℃に保持した状態で、温度35℃、湿度80%の恒温恒
湿試験機に入れて結露を生じさせ、1日保管した。この
処理を1サイクルとして、赤錆発生率(=端面の赤錆発
生面積/端面の被検総面積)5%に達するまでのサイク
ル数を測定し、30サイクル以上を◎、20〜29サイ
クルを○、10〜19サイクルを△、10サイクル未満
を×として評価した。これらの調査結果を表1に示す。The cut end face was visually observed to examine the separation mode, and the cut end face was examined for rust resistance. The rust resistance was evaluated by using a sample of the cut surface-treated steel sheet for 20 days.
While maintaining the temperature at 0 ° C., the sample was placed in a thermo-hygrostat at a temperature of 35 ° C. and a humidity of 80% to cause dew condensation, and stored for 1 day. With this treatment as one cycle, the number of cycles until the red rust occurrence rate (= red rust occurrence area on the end face / total test area on the end face) reaches 5% is measured. 10 to 19 cycles were evaluated as Δ, and less than 10 cycles were evaluated as x. Table 1 shows the results of these investigations.
【0023】[0023]
【表1】 [Table 1]
【0024】表1に示す結果から明らかなように、本発
明に従って表面処理母鋼板を切断し、製造した表面処理
鋼板は、いずれもサイクル数20以上の成績を示し、良
好な耐錆性を有していることがわかる。これに対し、比
較例の場合には、耐錆性が劣っている。As is evident from the results shown in Table 1, the surface-treated steel sheets produced by cutting the surface-treated mother steel sheet according to the present invention all have a cycle number of 20 or more and have good rust resistance. You can see that it is doing. On the other hand, in the case of the comparative example, the rust resistance is poor.
【0025】[0025]
【発明の効果】以上説明したように、本発明によれば、
切断加工端面での、耐錆性に優れる表面処理鋼板を提供
することが可能となる。したがって、本発明によれば、
表面処理母鋼板が、Zn系のめっきしたままの状態、め
っき後に化成処理した状態、あるいはめっき−化成処理
後に塗装処理した状態のいずれの場合であっても、切断
端面における耐錆性が良好な表面処理鋼板が得られるの
で、切断加工後に塗装など特別な処理を行う必要がな
く、製品コスト低減に寄与するのみでなく、将来実現視
される製品部材の再利用を可能とし、地球環境の保護に
貢献するところ大である。As described above, according to the present invention,
It is possible to provide a surface-treated steel sheet having excellent rust resistance at the cut end face. Thus, according to the present invention,
Whether the surface-treated mother steel sheet is in a Zn-plated state, in a state of chemical conversion treatment after plating, or in a state of coating treatment after plating-chemical conversion treatment, the rust resistance at the cut end surface is good. As a surface-treated steel sheet is obtained, there is no need to perform special treatment such as painting after cutting, not only contributing to product cost reduction, but also enabling the reuse of product members that can be realized in the future, and protecting the global environment. It is a great place to contribute to.
【図1】切断端面における剪断面比率を説明する図であ
る。FIG. 1 is a diagram illustrating a shear surface ratio at a cut end surface.
【図2】切断工具のクリアランスと剪断面比率との関係
を示すグラフである。FIG. 2 is a graph showing a relationship between a clearance of a cutting tool and a shear surface ratio.
Claims (6)
とを特徴とする端面の耐錆性に優れる表面処理鋼板。1. The shape of the cut end face is as follows: t 2 / (M · R s ) ≦ 0.2, where t: plate thickness (mm), M: weight per unit area of Zn (g / m) 2 ), R S : a surface-treated steel sheet having excellent end surface rust resistance, which satisfies a shear surface ratio (= shear surface thickness / sheet thickness).
にあたり、上下一対の工具により切断するときのその切
断端面にしめる剪断面の比率、鋼板の板厚およびZn目
付量の関係が、下記式; t2 /(M・RS )≦0.2 ただし、t:板厚(mm)、 M:片面当たりのZn目付量(g/m2 )、 RS :剪断面比率(=剪断面厚み/板厚)を満足するよ
うに亜鉛めっき処理し、切断を行うことを特徴とする端
面の耐錆性に優れる表面処理鋼板の製造方法。2. In the production of a zinc-plated surface-treated steel sheet, the relationship between the ratio of the shearing surface to be cut to the cut end face when cutting with a pair of upper and lower tools, the sheet thickness of the steel sheet, and the basis weight of Zn is as follows: T 2 / (M · R s ) ≦ 0.2, where t: plate thickness (mm), M: weight per area of Zn (g / m 2 ), R s : shear surface ratio (= shear surface thickness) / Sheet thickness), and a method for producing a surface-treated steel sheet having excellent rust resistance at the end face, which is characterized by performing galvanizing treatment and cutting.
下一対の工具により切断するにあたり、切断端面にしめ
る剪断面の比率が、鋼板の板厚およびZn目付量に応じ
て、下記式; t2 /(M・RS )≦0.2 ただし、t:板厚(mm)、 M:片面当たりのZn目付量(g/m2 )、 RS :剪断面比率(=剪断面厚み/板厚)を満足するよ
うに上記工具間のクリアランスを調整することを特徴と
する端面の耐錆性に優れる表面処理母鋼板の切断方法。3. When cutting a zinc-plated surface-treated mother steel sheet with a pair of upper and lower tools, the ratio of the shearing surface to be cut to the cut end face is determined by the following formula according to the thickness of the steel sheet and the basis weight of Zn; 2 / (M · R s ) ≦ 0.2, where t: plate thickness (mm), M: weight per unit area of Zn (g / m 2 ), R s : shear surface ratio (= shear surface thickness / plate) Thickness), wherein the clearance between the tools is adjusted so as to satisfy thickness).
0.9、片面当たりのZn目付量5g/m2 以上のうち
の少なくとも一方の条件を満たす表面処理鋼板。4. The method according to claim 1, wherein the shear surface ratio is 0.5 to 0.5.
0.9, a surface-treated steel sheet which satisfies at least one of the following conditions: a basis weight of Zn per side of 5 g / m 2 or more.
0.9、片面当たりのZn目付量5g/m2 以上のうち
の少なくとも一方の条件を満たす表面処理鋼板の製造方
法。5. The method according to claim 2, wherein the shear surface ratio is 0.5 to 0.5.
0.9, a method for producing a surface-treated steel sheet that satisfies at least one of the following conditions: a basis weight of Zn per side of 5 g / m 2 or more.
0.9、片面当たりのZn目付量5g/m2 以上のうち
の少なくとも一方の条件を満たす表面処理母鋼板の切断
方法。6. The method according to claim 3, wherein the shear surface ratio is 0.5 to 0.5.
0.9, a method of cutting a surface-treated mother steel sheet that satisfies at least one of the following conditions: a basis weight of Zn per side of 5 g / m 2 or more.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8503597A JPH10280116A (en) | 1997-04-03 | 1997-04-03 | Surface-treated steel sheet excellent in rusting-resistance edge face, its production and cutting of surface-treated mother steel sheet |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8503597A JPH10280116A (en) | 1997-04-03 | 1997-04-03 | Surface-treated steel sheet excellent in rusting-resistance edge face, its production and cutting of surface-treated mother steel sheet |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH10280116A true JPH10280116A (en) | 1998-10-20 |
Family
ID=13847453
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8503597A Pending JPH10280116A (en) | 1997-04-03 | 1997-04-03 | Surface-treated steel sheet excellent in rusting-resistance edge face, its production and cutting of surface-treated mother steel sheet |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH10280116A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003105512A (en) * | 2001-09-26 | 2003-04-09 | Honda Motor Co Ltd | Method of manufacturing zinc steel sheet for car body panel |
JP2009287082A (en) * | 2008-05-29 | 2009-12-10 | Jfe Steel Corp | Galvanized steel sheet, cutting processing method of the same, and die for cutting processing |
WO2018122933A1 (en) | 2016-12-26 | 2018-07-05 | 日新製鋼株式会社 | Surface-treated steel plate component having cut end surface, and cutting method therefor |
-
1997
- 1997-04-03 JP JP8503597A patent/JPH10280116A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003105512A (en) * | 2001-09-26 | 2003-04-09 | Honda Motor Co Ltd | Method of manufacturing zinc steel sheet for car body panel |
JP2009287082A (en) * | 2008-05-29 | 2009-12-10 | Jfe Steel Corp | Galvanized steel sheet, cutting processing method of the same, and die for cutting processing |
WO2018122933A1 (en) | 2016-12-26 | 2018-07-05 | 日新製鋼株式会社 | Surface-treated steel plate component having cut end surface, and cutting method therefor |
KR20190102215A (en) | 2016-12-26 | 2019-09-03 | 닛테츠 닛신 세이코 가부시키가이샤 | Parts of surface-treated steel sheet having a cut section and cutting method thereof |
US11123785B2 (en) | 2016-12-26 | 2021-09-21 | Nippon Steel Corporation | Surface-treated steel sheet part having cut end surface, and cutting method therefor |
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