JPH0367761B2 - - Google Patents
Info
- Publication number
- JPH0367761B2 JPH0367761B2 JP29382987A JP29382987A JPH0367761B2 JP H0367761 B2 JPH0367761 B2 JP H0367761B2 JP 29382987 A JP29382987 A JP 29382987A JP 29382987 A JP29382987 A JP 29382987A JP H0367761 B2 JPH0367761 B2 JP H0367761B2
- Authority
- JP
- Japan
- Prior art keywords
- valley
- roughness
- ridge
- steel sheet
- groove
- 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.)
- Expired
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 63
- 239000010959 steel Substances 0.000 claims description 63
- 238000005096 rolling process Methods 0.000 claims description 21
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 description 16
- 238000005422 blasting Methods 0.000 description 13
- 239000003973 paint Substances 0.000 description 11
- 238000005554 pickling Methods 0.000 description 10
- 230000003746 surface roughness Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 238000010422 painting Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000010953 base metal Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229920000298 Cellophane Polymers 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000012611 container material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、優れた塗装密着性及び塗装後の鮮映
性が得られる高粗度かつ鮮映に優れた中低炭素熱
延鋼板及びその製造方法に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a medium-low carbon hot-rolled steel sheet with high roughness and excellent sharpness that provides excellent paint adhesion and sharpness after painting, and a medium-low carbon hot rolled steel sheet thereof. Regarding the manufacturing method.
熱延鋼帯または熱延鋼板（以下熱延鋼板と称す
る）は、熱間圧延後、通常、酸洗もしくはシヨツ
トブラスト等により脱スケールが行われる。
After hot rolling, hot rolled steel strips or hot rolled steel sheets (hereinafter referred to as hot rolled steel sheets) are usually descaled by pickling, shot blasting, or the like.
酸洗は硫酸、塩酸などの酸により化学的に脱ス
ケールを行うもので、この場合、酸洗後の鋼板表
面の粗度は中心線平均粗さRaで2μｍ未満となる。 Pickling is a method of chemically descaling using an acid such as sulfuric acid or hydrochloric acid, and in this case, the roughness of the steel plate surface after pickling is less than 2 μm in center line average roughness Ra.
またシヨツトブラストは鋼球などのシヨツト粒
を鋼板表面に投射して脱スケールを行うもので、
この場合に得られる表面粗度Raは8μｍまで大き
くすることが可能となる。従つてコンテナ材、配
電盤材などの熱延鋼板を塗装して使用する場合に
は酸洗材より表面粗度が大きく、そのために塗装
密着性のよいシヨツトブラスト材が多く用いられ
る。 Shot blasting is a method of descaling by projecting shot particles such as steel balls onto the surface of a steel plate.
In this case, the surface roughness Ra obtained can be increased to 8 μm. Therefore, when hot-rolled steel sheets such as container materials and switchboard materials are to be painted and used, shot blasting materials are often used because they have a higher surface roughness than pickled materials and have better paint adhesion.
なお、上記熱延鋼板としては、Ｃ量が0.04〜
0.35wt％の範囲にある中低炭素鋼が素材として使
用される。 In addition, as for the above-mentioned hot-rolled steel sheet, the amount of C is 0.04~
Medium and low carbon steel in the range of 0.35wt% is used as the material.
しかしながら、酸洗により脱スケールしたまま
の熱延鋼板はその表面肌は表面粗度Raが2μｍ未
満と低いため塗装密着性が非常に悪く、コンテナ
材等には使用できなかつた。
However, the hot-rolled steel sheet that has been descaled by pickling has a low surface roughness Ra of less than 2 μm, and therefore has very poor paint adhesion and cannot be used as a material for containers or the like.
一方、シヨツトブラストによる脱スケールには
以下のようにまた解決すべき種々の問題点が残さ
れている。まず、シヨツトブラスト後の熱延鋼板
表面にはシヨツト粒やグリツト、あるいは酸化ス
ケール等が残留することがあり、場合によつては
これらがそのまま表面汚れとなつて残り、またこ
の表面に塗装を施しても塗装密着性が悪くなるこ
とからシヨツトブラスト後にさらに酸洗等の処理
が必要となる。 On the other hand, descaling by shot blasting still has various problems to be solved as described below. First, shot particles, grit, oxide scale, etc. may remain on the surface of a hot rolled steel sheet after shot blasting, and in some cases, these may remain as surface stains, and this surface may not be painted. Even if this is done, the adhesion of the paint deteriorates, so further treatment such as pickling is required after shot blasting.
また、熱延鋼板を出荷するに際して、一般にス
キンパスミルによる形状矯正を行つているが、こ
の際に塗装密着性を良好とするシヨツトブラスト
の高粗度が潰れてしまうという問題がある。 Furthermore, when hot-rolled steel sheets are shipped, the shape is generally corrected using a skin pass mill, but there is a problem in that the high roughness of shot blasting, which improves paint adhesion, is destroyed during this process.
さらに、鋼板表面に投射するシヨツト粒は回収
して循環使用するためシヨツト粒は使用するにつ
れて摩耗、細粒化してゆく結果、表面粗度も変化
してゆくので、安定した状態の表面粗度が得られ
ないという問題もある。 Furthermore, since the shot particles projected onto the steel plate surface are collected and recycled, the shot particles wear out and become finer as they are used, resulting in changes in surface roughness. There is also the problem of not being able to get it.
そして、シヨツトブラスト鋼板においては、そ
の表面の凹凸パターンは第２図に示すように、急
峻で且つ不規則であるため、塗装後の表面は散乱
光が多く鮮映性の良さは望むべくもない、という
問題があつた。 As shown in Figure 2, the shot-blasted steel plate has a steep and irregular uneven pattern on its surface, so the surface after painting has a lot of scattered light and the image clarity is not as good as expected. The problem was that there was no.
この発明は、このような従来の問題点にかんが
みてなされたものであつて、表面粗度Raを２〜
8μｍとし、SmとＤとの関係を0.7≦Sm／Ｄ≦2.0
とした熱延鋼板とし、且つこの鋼板を所定の処理
を施したレーザーダルロールにより圧延する製造
方法とすることにより、上記問題点を解決するこ
とを目的としている。 This invention was made in view of these conventional problems, and it is possible to increase the surface roughness Ra from 2 to 2.
8 μm, and the relationship between Sm and D is 0.7≦Sm/D≦2.0
The purpose of the present invention is to solve the above-mentioned problems by producing a hot-rolled steel plate and rolling the steel plate using a laser dull roll that has been subjected to a predetermined treatment.
この発明は、表面の中心線平均粗さRaが２〜
8μｍの範囲内にあり、且つこの表面の微視的形
状が平坦な山頂面を有する山部と、この山部の周
囲の全部または一部を囲繞するように形成された
溝状の谷部と、前記山部の間であつて且つ谷部の
外側にその谷部の底よりも高く且つ山部の山頂面
より低く形成された中間平坦部とによつて構成さ
れ、しかも隣り合う山部の平均中心間距離をSm、
谷部の外縁の平均直径をＤとしたとき、SmとＤ
とが0.7≦Sm／Ｄ≦2.0なる関係を有する高粗度
かつ鮮映性に優れた中低炭素熱延鋼板を第１の発
明とし、この鋼板を製造する方法の発明として、
表面の中心線平均粗さがRa3〜15μｍの範囲内に
あり、且つこの表面にレーザーパルスビームで形
成された微小クレータが所定のパターンで規則正
しく配列されたダルロールを使用し、圧下率0.5
〜3.0％にて圧延することにより、前記高粗度か
つ鮮映性に優れた中低炭素熱延鋼板を製造する方
法を第２の発明として提供するものである。
In this invention, the center line average roughness Ra of the surface is 2 to 2.
A ridge within the range of 8 μm and having a flat top surface with a microscopic shape, and a groove-like valley formed to surround all or part of the periphery of this ridge. , an intermediate flat part formed between the mountain parts and outside the valley part, which is higher than the bottom of the valley part and lower than the top surface of the mountain part; The average center distance is Sm,
When the average diameter of the outer edge of the valley is D, Sm and D
A first invention is a medium-low carbon hot-rolled steel sheet with high roughness and excellent sharpness, and has a relationship of 0.7≦Sm/D≦2.0, and as an invention of a method for manufacturing this steel sheet,
A dull roll with a centerline average roughness of the surface within the range of Ra3 to 15 μm and on which micro craters formed by a laser pulse beam are regularly arranged in a predetermined pattern is used, and the rolling reduction is 0.5.
A second invention provides a method for producing the above-mentioned medium-low carbon hot-rolled steel sheet having high roughness and excellent image clarity by rolling the steel sheet at 3.0%.
表面を平滑に仕上げたワークロールを定速回転
させながらレーザーパルスビームを照射してその
表面に規則的に連続した点状に溶融した微小クレ
ータを形成する。このクレータの周囲には溶融し
た母材金属が盛り上がつてフランジが形成され
る。また隣り合うクレータのフランジ間の部分は
平滑面のままである。ここで、ロールの回転方向
にはロールの回転速度と関連づけてレーザーパル
スのパルス周期を制御し、ロールの軸方向にはロ
ールが１回転する毎にレーザー照射位置の移動ピ
ツチを制御することにより、クレータの平均中心
間距離をSmとし、レーザー出力及び照射時間等
を調整してフランジ外径をＤとしたとき、Smと
Ｄとの関係を0.7≦Sm／Ｄ≦2.0とし、且つ表面
粗度Raを３〜15μｍの範囲とすることができる。
A work roll with a smooth surface is rotated at a constant speed and irradiated with a laser pulse beam to form micro-craters in the shape of regularly continuous dots on the surface. The molten base metal rises around this crater to form a flange. Furthermore, the area between the flanges of adjacent craters remains a smooth surface. Here, in the rotational direction of the roll, the pulse period of the laser pulse is controlled in relation to the rotational speed of the roll, and in the axial direction of the roll, the movement pitch of the laser irradiation position is controlled every time the roll rotates. When the average distance between the centers of craters is Sm, and the outer diameter of the flange is D by adjusting the laser output and irradiation time, the relationship between Sm and D is 0.7≦Sm/D≦2.0, and the surface roughness Ra can be in the range of 3 to 15 μm.
このように表面粗度を形成したダルロールでス
キンパス圧延を施した酸洗後の熱延鋼板表面に
は、クレータのフランジで押圧されて生じた谷部
の内側には鋼板の金属が流込んで山頂部が形成さ
れる。一方、ロールの平滑面はそのまま鋼板の平
滑部となり、この部分は前記谷部の底よりも高く
山頂部よりも低い中間平坦部として形成される。
そして、このような山部と谷部とは、上記のごと
くダルロールのクレータ配列形成条件を制御し、
圧下率を0.5％〜0.3％とすることによつて、この
ロールでスキンパス圧延を施された鋼板の中心線
平均粗さRaを２〜8μｍの範囲とすることができ
る。 After pickling, the surface of the hot-rolled steel sheet has been subjected to skin-pass rolling with dull rolls that have formed a surface roughness.The metal of the steel sheet flows into the valleys formed by the pressure of the flanges of the crater, and the metal from the steel sheet flows into the peaks. part is formed. On the other hand, the smooth surface of the roll directly becomes a smooth part of the steel plate, and this part is formed as an intermediate flat part that is higher than the bottom of the valley and lower than the peak part.
These peaks and valleys are created by controlling the conditions for forming the dull roll crater array as described above.
By setting the rolling reduction ratio to 0.5% to 0.3%, the center line average roughness Ra of the steel plate subjected to skin pass rolling with these rolls can be in the range of 2 to 8 μm.
従つて、この熱延鋼板の表面は平坦部が多く且
つ規則正しい配列となつているので、従来のシヨ
ツトブラスト鋼板のような高粗度が得られて塗装
密着性及び塗装後の鮮映性に優れた表面粗さを有
する高粗度・高鮮映性熱延鋼板とすることができ
る。 Therefore, since the surface of this hot-rolled steel sheet has many flat areas and is arranged in a regular manner, it can achieve the same high roughness as conventional shot-blasted steel sheets, improving paint adhesion and image clarity after painting. A high-roughness, high-definition hot-rolled steel sheet with excellent surface roughness can be obtained.
以下、この発明を図面に基づいて説明する。第
１図及び第３〜８図は本発明に係る実施例の説明
図である（第２図は従来例の鋼板であるが、同部
分の実施例との対比上、本発明の鋼板を示す第１
図に並示したものである。）
先ず、本発明に係る熱延鋼板を製造するための
スキンパス圧延用のダルロールの表面粗度形成方
法について説明する。
The present invention will be explained below based on the drawings. FIG. 1 and FIGS. 3 to 8 are explanatory diagrams of embodiments according to the present invention (FIG. 2 shows a steel plate of a conventional example, but for comparison with an embodiment of the same part, a steel plate of the present invention is shown. 1st
They are shown side by side in the figure. ) First, a method for forming the surface roughness of a dull roll for skin pass rolling for manufacturing a hot rolled steel sheet according to the present invention will be described.
表面を研摩加工により平滑に仕上げてワークロ
ール表面に、レーザービーム等の高密度エネルギ
源を、上記ロールを定速度で回転させながらパル
ス状に照射して規則的に連続した点状に溶融した
微小クレータを形成する。 The surface of the work roll is smoothed by polishing, and a high-density energy source such as a laser beam is applied to the work roll surface in a pulsed manner while rotating the roll at a constant speed to form microscopic particles that are melted into regularly continuous dots. Form a crater.
第３図ａは、この点状に溶融されたロール表面
の拡大断面図であつて、１はロールＲ表面に形成
された微小クレータであり、このクレータ１の周
囲には溶融した母材金属がロール表面よりも盛り
上がつてフランジ２が形成される。また隣り合う
クレータのフランジ２間の部分は、もとのロール
Ｒの研磨面のままの平滑部３である。ここで、隣
り合うクレータ１間の距離は、ロールＲの回転方
向にはロールＲの回転速度と関連づけてレーザー
パルスのパルス周期を制御することにより、また
ロールＲの胴長方向に対してはロールＲが１回転
する毎にレーザーの照射位置をロールＲの軸方向
へ移動させるピツチを制御することによつて調整
し、その平均中心間距離Smを所定値とすること
ができる。またクレータ１の大きさ及びフランジ
２の外径Ｄの大きさはレーザービームの照射時間
及びレーザー出力等を変えることにより制御でき
る。 FIG. 3a is an enlarged cross-sectional view of the dot-shaped melted roll surface, and 1 is a micro crater formed on the roll R surface, and around this crater 1 there is molten base metal. A flange 2 is formed by protruding above the roll surface. Further, the portion between the flanges 2 of adjacent craters is a smooth portion 3 that remains the polished surface of the original roll R. Here, the distance between adjacent craters 1 can be determined by controlling the pulse period of the laser pulse in relation to the rotation speed of the roll R in the rotation direction of the roll R, and by controlling the pulse period of the laser pulse in relation to the rotation speed of the roll R, and in the body length direction of the roll R. The average center-to-center distance Sm can be adjusted to a predetermined value by controlling the pitch at which the laser irradiation position is moved in the axial direction of the roll R every time R rotates once. Further, the size of the crater 1 and the size of the outer diameter D of the flange 2 can be controlled by changing the laser beam irradiation time, laser output, etc.
次に、このように表面をダル加工したワークロ
ールＲを上下一対としてスキンパスミルに組込ん
で酸洗後の熱延鋼板Ｓにスキンパス圧延を施す場
合の作用について説明する。 Next, a description will be given of the operation when a pair of upper and lower work rolls R whose surfaces have been dulled in this manner are assembled into a skin pass mill and skin pass rolling is performed on a pickled hot rolled steel sheet S.
このスキンパス圧延過程における鋼板Ｓの挙動
を微視的に拡大すると、第３図ａ，ｂに示すよう
に、ロールＲ表面のクレータ１周縁のほぼ均一な
高さを有するフランジ２が鋼板Ｓの表面に強い圧
力で押付けられると、ロールＲの材質より軟質な
鋼板Ｓの表面近傍で素材の局所的塑性流動が生
じ、ロールＲのクレータ１へ鋼板Ｓの金属が流込
んで粗面が形成される。すなわち、クレータ１内
へ流込んだ金属は鋼板Ｓ表面の山頂部４となり、
ロールＲの平滑部３はそのまま鋼板Ｓ表面の平坦
部５を形成して山頂部４はこの平坦部５より高く
なる。従つてスキンパス圧延後の鋼板Ｓの表面に
おける微視的形状は第３図ｂ及び第１図にその断
面で示すように、山頂部４を有する山部６とその
周囲に形成された環状溝の谷部７と、隣り合う山
部６の間であつて且つ谷部７の外側にその谷部７
の底よりも高く且つ山頂部４より低く形成された
中間平坦部５とによつて構成され、これら各部が
ほぼ等間隔に配列されたパターンを形成する。 When the behavior of the steel sheet S during this skin pass rolling process is microscopically enlarged, as shown in FIGS. When pressed with strong pressure, local plastic flow of the material occurs near the surface of the steel plate S, which is softer than the material of the roll R, and the metal of the steel plate S flows into the crater 1 of the roll R, forming a rough surface. . In other words, the metal that has flowed into the crater 1 becomes the peak 4 on the surface of the steel plate S,
The smooth portion 3 of the roll R directly forms a flat portion 5 on the surface of the steel plate S, and the peak portion 4 is higher than this flat portion 5. Therefore, the microscopic shape on the surface of the steel sheet S after skin pass rolling is composed of a crest 6 having a crest 4 and an annular groove formed around it, as shown in the cross section in FIG. There is a trough 7 between the trough 7 and the adjacent ridge 6 and outside the trough 7.
and an intermediate flat part 5 formed higher than the bottom of the mountain and lower than the top part 4, and these parts form a pattern arranged at approximately equal intervals.
ここで、山部６の径をｄ、山頂部４の平坦部５
からの高さをh1、谷部７の平坦部５からの深さを
h2とすると、鋼板Ｓ表面の品質（特性）は、これ
らの表面構成因子の最適な組合せにより決定され
る。 Here, the diameter of the peak part 6 is d, and the flat part 5 of the peak part 4 is
h 1 is the height from the flat part 5, and the depth of the valley part 7 from the flat part 5 is
Assuming that h2 , the quality (characteristics) of the surface of the steel plate S is determined by the optimal combination of these surface constituent factors.
第４図に圧下率とダル目転写率との関係を示
し、第５図に圧下率と機械的性質（伸び）の関係
を示す。これらの図を得るために使用したのは、
Ｃ：0.16wt％、Si：0.10wt％、Mn：0.65wt％、
Ｐ：0.020wt％、Ｓ：0.015wt％、Al：0.020wt
％、残部Fe及び不可避的不純物からなる厚さ2.3
mmの熱延鋼板である。これらの図に示した関係よ
り圧下率が0.5％未満では転写率が低く所定のダ
ル目が得られず且つスキンパスによる形状矯正が
できないこと、また圧下率が３％を越えると伸び
Elが34％以下となることが示され、従つて機械的
性質を損なわず、且つ高塗装密着性、高鮮映性を
発揮するRa2μｍ〜8μｍのダル目を得る適当な圧
下率は0.5〜3.0％であることがわかる。 FIG. 4 shows the relationship between the rolling reduction rate and the round transfer rate, and FIG. 5 shows the relationship between the rolling reduction rate and mechanical properties (elongation). I used the following to obtain these figures:
C: 0.16wt%, Si: 0.10wt%, Mn: 0.65wt%,
P: 0.020wt%, S: 0.015wt%, Al: 0.020wt
%, thickness 2.3 with balance Fe and unavoidable impurities
mm hot rolled steel plate. The relationship shown in these figures shows that if the rolling reduction rate is less than 0.5%, the transfer rate will be low and it will not be possible to obtain the desired dowel, and the shape cannot be corrected by a skin pass, and if the rolling reduction rate exceeds 3%, elongation will occur.
It has been shown that El is 34% or less. Therefore, the appropriate rolling reduction ratio to obtain a dull grain of Ra 2 μm to 8 μm that does not impair mechanical properties and exhibits high paint adhesion and high image clarity is 0.5 to 3.0. %It can be seen that it is.
次に、隣り合う山部６の平均中心間距離Smと
谷部７の外径ＤによるSm／Ｄとの塗装密着性と
の関係についての測定結果を第６図に示す。この
図は、前述した第４図、第５図の場合と同じ成分
の鋼板に、Ｄを600μｍに固定し、Smを変化させ
た複数本のロールを用いて、圧下率2.0％でスキ
ンパスを行つて得られたものである。図において
横軸にSm／Ｄの値を、縦軸に塗装密着度を示す。
ここで、塗装密着度は、一般に行われるセロフア
ンテープによる剥離テストで評価したものであつ
て、図においては表面粗度Ra7.8μｍのシヨツト
ブラスト材Ｐ（一点鎖線で示す）と本発明により
熱延鋼板Ｓとを比較した。これにより、Sm／Ｄ
が0.7を越え且つ2.0以下の領域で密着性は同等も
しくはそれ以上に優れていることがわかる。 Next, FIG. 6 shows the measurement results regarding the relationship between the average center-to-center distance Sm of adjacent peaks 6 and Sm/D, which is determined by the outer diameter D of the valleys 7, and the coating adhesion. This figure shows a steel plate with the same composition as in the case of Figures 4 and 5 described above, D fixed at 600 μm, and skin pass performed at a rolling reduction rate of 2.0% using multiple rolls with varying Sm. This is what was obtained. In the figure, the horizontal axis shows the value of Sm/D, and the vertical axis shows the degree of paint adhesion.
Here, the coating adhesion was evaluated by a peeling test using a commonly performed cellophane tape. A comparison was made with hot rolled steel sheet S. As a result, Sm/D
It can be seen that the adhesion is equal to or even better in the region where the value is greater than 0.7 and less than 2.0.
第７図は、第６図で用いた試験片をそのまま使
用して塗装後の鮮映性を光沢度で代用して調査し
た結果を示したもので、横軸はSm／Ｄ、縦軸は
光沢度（＝反射受光量×100／投射光量）をとつ
たものである。図中、Ｐはシヨツトブラスト材、
ｑは酸洗材を、実線は本発明によるレーザーダル
材を示す。この図からSm／Ｄが0.7以上であれば
シヨツトブラスト材は勿論、酸洗材よりも光沢度
が優れていることがわかる。 Figure 7 shows the results of an investigation using the test piece used in Figure 6 as it is and substituting glossiness for the sharpness after painting.The horizontal axis is Sm/D, and the vertical axis is Sm/D. It is calculated by the glossiness (=amount of reflected and received light x 100/amount of projected light). In the figure, P is shot blasting material,
q indicates the pickling material, and the solid line indicates the laser dull material according to the present invention. From this figure, it can be seen that when Sm/D is 0.7 or more, the gloss is superior not only to shot blasting materials but also to pickling materials.
以上により、本発明においてSm／Ｄを0.7≦
Sm／Ｄ≦2.0と限定するものである。 According to the above, in the present invention, Sm/D is 0.7≦
It is limited to Sm/D≦2.0.
以上、本発明では熱延鋼板の微視的形状を規制
したが、これのみでは不十分であり、鋼板の粗さ
自体も規制しなければならない。すなわち、
Ra2.0μｍ未満ではSm／Ｄが0.7〜2.0の範囲内に
あつても酸洗材なみの光沢度を確保できず、また
Ra8.0を越えると塗装密着性がシヨツトブラスト
材を下まわることから、鋼板粗さはRa2.0〜8.0μ
ｍの範囲とすべきである。 As described above, in the present invention, the microscopic shape of the hot rolled steel sheet is regulated, but this alone is insufficient, and the roughness of the steel sheet itself must also be regulated. That is,
If Ra is less than 2.0 μm, even if Sm/D is within the range of 0.7 to 2.0, it will not be possible to secure the same level of gloss as that of pickled materials, and
If Ra8.0 is exceeded, the paint adhesion will be lower than that of shot blasting material, so the steel plate roughness should be Ra2.0~8.0μ.
The range should be m.
以下に実際例を示す。 A practical example is shown below.
高密度エネルギ源としてレーザーパルスビーム
を使用してRa3〜15μｍ（RMAX10〜60μｍ）、
Sm／Ｄ＝0.7〜2.0の範囲内にある表面粗度ロー
ルを複数本作成し、これを用いて酸洗後の熱延鋼
板（Ｃが0.08wt％、0.24wt％及び0.32wt％の普通
鋼）を圧下率0.5〜３％の範囲で鋼板粗度がRaで
２〜8μｍとなるようにスキンパスを行つた。こ
のとき得られた鋼板の表面形態は、山頂部４の直
径が160〜180μｍ、谷部のＤが200〜1000μｍ、h1
が20〜80μｍ、h2が15〜60μｍであつた。 Ra3~15μm (R MAX 10~60μm), using laser pulse beam as high density energy source
A plurality of rolls with a surface roughness within the range of Sm/D = 0.7 to 2.0 were created, and these were used to prepare hot rolled steel sheets after pickling (common steel with C content of 0.08wt%, 0.24wt%, and 0.32wt%). ) was subjected to a skin pass at a rolling reduction rate of 0.5 to 3% so that the roughness of the steel sheet was 2 to 8 μm in Ra. The surface morphology of the steel plate obtained at this time is such that the diameter of the peak portion 4 is 160 to 180 μm, the D of the valley portion is 200 to 1000 μm, and h 1
was 20 to 80 μm, and h2 was 15 to 60 μm.
このようにして得られた熱延鋼板はいずれも従
来のシヨツトブラスト材、酸洗材よりも塗装密着
性及び鮮映性に優れ、また表面の汚れもなく形状
も良好であつた。 All of the hot-rolled steel sheets thus obtained had better paint adhesion and sharpness than conventional shot blasting materials and pickling materials, and had good shapes with no surface stains.
なお、圧下率が0.5％未満の場合には、得られ
た鋼板粗度Raはいずれも2μｍ未満となり、塗装
密着性が悪く、また、圧下率が３％を超えると、
Ｃが0.32wt％のより硬質な鋼板あつても、鋼板粗
度Raが8μｍを超え、鮮映性（光沢度）が悪くな
つた。 In addition, if the rolling reduction ratio is less than 0.5%, the obtained steel plate roughness Ra will be less than 2 μm, and the coating adhesion will be poor, and if the rolling reduction ratio exceeds 3%,
Even with a harder steel plate containing 0.32 wt% C, the steel plate roughness Ra exceeded 8 μm and the image clarity (gloss) deteriorated.
以上説明したように、この発明によれば以下の
ような効果を得ることができる。
As explained above, according to the present invention, the following effects can be obtained.
(1) 熱延鋼板の表面は平坦部の多い規則的な凹凸
パターンを有するので、塗装密着性と塗装後の
鮮映性に優れる。(1) The surface of hot-rolled steel sheets has a regular uneven pattern with many flat areas, so it has excellent coating adhesion and post-coating clarity.
(2) シヨツトブラストに依らず高粗度を付与する
のでシヨツト粒などの残留はなくなり、表面の
清浄な熱延鋼板が得られる。(2) Since high roughness is imparted without relying on shot blasting, there is no residual shot grain, and a hot rolled steel sheet with a clean surface can be obtained.
(3) 粗度の付与と形状矯正をスキンパスミルで同
時に行えるので、工程短縮、製造エネルギの節
減等が図れる。(3) Roughness can be imparted and shape corrected at the same time using a skin pass mill, which shortens the process and saves manufacturing energy.
第１図は本発明に係る熱延鋼板表面の拡大断面
図、第２図はシヨツトブラストによる鋼板表面の
拡大断面図、第３図ａは本発明に係るレーザーダ
ルロール表面の拡大断面図、同図ｂは同図ａのレ
ーザーダルロールで圧延した鋼板表面の拡大断面
図、第４図は転写率と圧下率との関係を示すグラ
フ、第５図は圧下率と鋼板の伸び（％）との関係
を示すグラフ、第６図は塗装密着度とSm／Ｄと
の関係を示すグラフ、第７図は塗装後の鋼板の鮮
映性を光沢度とSm／Ｄの関係で示したグラフで
ある。
１……クレータ、２……フランジ部、３……平
坦部、４……山頂部、５……中間平坦部、６……
山部、７……谷部。
FIG. 1 is an enlarged sectional view of the surface of a hot rolled steel sheet according to the present invention, FIG. 2 is an enlarged sectional view of the surface of a steel sheet by shot blasting, and FIG. 3a is an enlarged sectional view of the surface of a laser dull roll according to the present invention. Figure b is an enlarged cross-sectional view of the surface of a steel plate rolled with the laser dull roll in Figure a, Figure 4 is a graph showing the relationship between transfer rate and reduction rate, and Figure 5 is the reduction rate and elongation of the steel plate (%). Figure 6 is a graph showing the relationship between paint adhesion and Sm/D. Figure 7 is a graph showing the sharpness of the steel plate after painting as a relationship between gloss and Sm/D. It is. 1... Crater, 2... Flange part, 3... Flat part, 4... Mountain top part, 5... Intermediate flat part, 6...
Yamabe, 7...Tanibe.
Claims (1)
内にあり、且つこの表面の微視的形状が平坦な山
頂面を有する山部と、この山部の周囲の全部また
は一部を囲繞するように形成された溝状の谷部
と、前記山部の間であつて且つ谷部の外側にその
谷部の底よりも高く且つ山部の山頂面より低く形
成された中間平坦部とによつて構成され、しかも
隣り合う山部の平均中心間距離をSm、谷部の外
縁の平均直径をＤとしたとき、SmとＤとが0.7≦
Sm／Ｄ≦2.0となる関係を有することを特徴とす
る高粗度かつ鮮映性に優れた中低炭素熱延鋼板。 ２ 表面の中心線平均粗さRaが３〜15μｍの範囲
内にあり、且つこの表面にレーザーパルスビーム
で形成された微小クレータが所定のパターンで規
則正しく配列されたダルロースを使用し、圧下率
0.5〜3.0％にて圧延することにより、表面の中心
線平均粗さRaが２〜8μｍの範囲内にあり、且つ
この表面の微視的形状が平坦な山頂面を有する山
部と、この山部の周囲の全部または一部を囲繞す
るように形成された溝状の谷部と、前記各山部の
間であつて且つ谷部の外側にその谷部の底よりも
高く且つ山部の山頂面より低く形成された中間平
坦部とによつて構成され、しかも隣り合う山部の
平均中心間距離をSm、谷部の外縁の平均直径を
Ｄとしたとき、SmとＤとが0.7≦Sm／Ｄ≦2.0な
る関係を有する高粗度かつ鮮映性に優れた中低炭
素熱延鋼板の製造方法。[Claims] 1. A ridge having a surface centerline average roughness Ra within a range of 2 to 8 μm and a crest having a flat microscopic shape, and a ridge around the ridge. A groove-shaped valley formed to surround the whole or part of the groove and a groove formed outside the valley and higher than the bottom of the valley and lower than the top surface of the peak. Furthermore, when the average distance between the centers of adjacent peaks is Sm and the average diameter of the outer edge of the valley is D, Sm and D are 0.7≦
A medium-low carbon hot-rolled steel sheet with high roughness and excellent image clarity, characterized by having a relationship of Sm/D≦2.0. 2 Using a dull roll whose surface has a center line average roughness Ra within the range of 3 to 15 μm and on which micro craters formed by a laser pulse beam are regularly arranged in a predetermined pattern, the rolling reduction rate is
By rolling at 0.5 to 3.0%, the center line average roughness Ra of the surface is within the range of 2 to 8 μm, and the microscopic shape of this surface is a ridge portion having a flat crest surface, and this ridge. A groove-shaped valley formed to surround all or a part of the periphery of the area, and a groove located between the respective peaks and outside the valley that is higher than the bottom of the valley and below the peak. and an intermediate flat part formed lower than the mountain top surface, and when the average distance between the centers of adjacent mountain parts is Sm and the average diameter of the outer edge of the valley part is D, Sm and D are 0.7≦ A method for producing a medium-low carbon hot-rolled steel sheet having a relationship of Sm/D≦2.0 and having high roughness and excellent image clarity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29382987A JPH01127104A (en) | 1987-07-16 | 1987-11-20 | Hot rolled steel sheet having high roughness and brightness and its manufacture |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17778587 | 1987-07-16 | ||
| JP62-177785 | 1987-07-16 | ||
| JP29382987A JPH01127104A (en) | 1987-07-16 | 1987-11-20 | Hot rolled steel sheet having high roughness and brightness and its manufacture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01127104A JPH01127104A (en) | 1989-05-19 |
| JPH0367761B2 true JPH0367761B2 (en) | 1991-10-24 |
Family
ID=26498202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29382987A Granted JPH01127104A (en) | 1987-07-16 | 1987-11-20 | Hot rolled steel sheet having high roughness and brightness and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01127104A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2787159B2 (en) * | 1989-06-01 | 1998-08-13 | 株式会社河合楽器製作所 | Rough surface processing method for metal plate for electrical parts |
| JP2593254B2 (en) * | 1991-06-28 | 1997-03-26 | 川崎製鉄株式会社 | Painted stainless steel sheet with excellent design and scratch resistance |
| JP5697098B2 (en) * | 2010-11-29 | 2015-04-08 | 日新製鋼株式会社 | Highly corrosion-resistant steel plate with less noticeable fingerprints and dirt and method for producing the same |
| DE102019214136A1 (en) * | 2019-09-17 | 2021-03-18 | Thyssenkrupp Steel Europe Ag | Sheet steel with a deterministic surface structure |
-
1987
- 1987-11-20 JP JP29382987A patent/JPH01127104A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01127104A (en) | 1989-05-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6797411B2 (en) | Galvanized steel sheet, method for manufacturing the same, and method for manufacturing press-formed product | |
| KR900006496B1 (en) | Steel sheets for painting and a method of producing the same | |
| CN102083562A (en) | Method and facility for removing scale from hot rolled steel sheet | |
| JPS63132701A (en) | Steel sheet for painting and its production | |
| US5582878A (en) | Process for producing magnetic recording medium | |
| JPH0367761B2 (en) | ||
| JP2000176513A (en) | Roll for temper rolling, method of temper rolling and temper rolled metal plate | |
| JP3317237B2 (en) | Titanium plate excellent in anti-glare properties, method for producing the same, and work roll used for the production | |
| JP3233056B2 (en) | Dull finishing work roll, surface treatment method thereof, and method for producing stainless steel sheet excellent in mattability | |
| JP3651665B2 (en) | Cold-rolled steel sheet with excellent press formability and sharpness after painting | |
| KR960015330B1 (en) | Steel strip having excellent painting sharpness and press moldability and method for producing rolling dull roll | |
| JPS62224405A (en) | Production of cold rolled steel sheet | |
| JPH01129996A (en) | Conductor roll | |
| JPS62137111A (en) | Manufacture of cold rolled steel plate having excellent coating sharpness | |
| JPH0335003B2 (en) | ||
| JPH06279B2 (en) | Method for manufacturing dull roll for rolling steel sheet | |
| JPH04280953A (en) | Galvannealed steel sheet and its production | |
| JPS63132702A (en) | Steel sheet for painting and its production | |
| JP2509489B2 (en) | Steel plate with excellent press formability | |
| JPH02280907A (en) | Rolling roll for dull working | |
| JPS63309309A (en) | Dull roll for cold rolling | |
| JPH05104102A (en) | Method for temper rolling steel strip | |
| JP2003311314A (en) | Method for manufacturing cold-rolled steel sheet | |
| JPS63119916A (en) | Manufacture of steel plate excellent in sharpness | |
| JPS63123586A (en) | Surface roughing method for roll for cold rolling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| LAPS | Cancellation because of no payment of annual fees |