JPS6274099A - Steel sheet for can having superior weldability - Google Patents

Abstract

PURPOSE:To manufacture a steel sheet for cans having superior weldability by properly plating the front and rear sides of a steel strip with Zn or the like so as to form stripes in the lateral direction, forming uniform metallic Cr layers by plating and producing chromium oxide on the Cr layers. CONSTITUTION:The front and rear sides of a steel strip are plated with Zn, a Zn-Sn alloy, an Ni-Sn alloy or an Ni-P alloy at intervals corresponding to the diameter of cans by about 0.1-5.0g/m<2> so as to form stripes of about 6-10mm width in the lateral direction. The front and rear sides of the steel strip having the resulting metallic layers are uniformly plated with metallic Cr by about 10-200mg/m<2> and chromium oxide is produced on the Cr layers by about 5-50mg/m<2> (expressed in terms of Cr). Thus, a steel sheet for cans having superior weldability, rust and corrosion resistances is obtd.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は、溶接性に優れた缶用鋼板に関するものである
。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a steel plate for cans having excellent weldability.

（従来技術） 溶接性に優れた缶用鋼板としては、例えば、鋼板表面に
錫メッキ金施し、その上層しこクロムメッキを施したも
の（特公昭５７−４５４７８号）、鋼板表面に５ｎ−Ｆ
θ合金メッキを施し１、その）：層にストライプ状に錫
メッキを施し、更シ′こその上層全面にクロム酸化物を
生成したもの（特公昭５６−３８４９２号）が開示され
ている。(Prior art) Examples of steel sheets for cans with excellent weldability include those in which the surface of the steel sheet is plated with tin and the upper layer is plated with chrome (Japanese Patent Publication No. 57-45478);
.theta. alloy plating 1): A layer is plated with tin in stripes, and chromium oxide is formed on the entire surface of the upper layer (Japanese Patent Publication No. 56-38492).

（発明の解決しようとする間町点） 本発明は、このようなストライプメノキの油浸れた溶接
性をもたらす缶用鋼板ｒ提ＩＵ　ｌ〜ようとするもので
ある。(Measures to be Solved by the Invention) The present invention seeks to provide a steel plate for cans that provides oil-soaked weldability of such striped agate wood.

（問題を解決する手段） 本発明者らは、鋼帯表裏面巾方向（・こ缶径（・ζ応１
つだ間隔でストライプ状にＺ　ｎ　＋　ｒ’＝　ｎ−：
Ｅ　ｎ合金、Ｎｉ−Ｓｎ合金、Ｎｉ−Ｐ合金の中１　ｉ
Ｑｆイｔメツギし、その上層及び鋼惜全［笛に金属クロ
ムメッキを飛し、更にその上層にクロム酸化物を生成せ
しめた、溶接性に優れた缶用鋼板及び 鋼帯表裏面全面にＦｅ−Ｓｎ合金、Ｎｉ、Ｓｎ、Ｎｉ−
Ｐの中から１種をメッキし、その上層表裏面巾方向に缶
径に応じた間隔でストライプ状にＺｎ、Ｚｎ−Ｓｎ合金
、Ｎｉ−Ｐ％Ｎｉ−Ｓｎ合金の中１種をメッキし、その
上層及び鋼帯全面に金属クロムメッキを施し、更にその
上層にクロム酸化物を生成せしめた、溶接性に優れた缶
用鋼板を見出すことによって本発明を完成した。(Means for Solving the Problem) The present inventors have developed a steel strip in the width direction of the front and back surfaces (・can diameter (・ζ
Z n + r'= n- in stripes with interstices:
E n alloy, Ni-Sn alloy, Ni-P alloy 1 i
Qf is applied to the upper layer and the entire surface of the steel sheet [metallic chrome plating is applied to the flute, and chromium oxide is formed on the upper layer, and steel sheet for cans with excellent weldability and steel strip are coated with Fe on the entire front and back surfaces. -Sn alloy, Ni, Sn, Ni-
One type of P is plated, and one type of Zn, Zn-Sn alloy, Ni-P%Ni-Sn alloy is plated in stripes on the top and bottom sides at intervals according to the can diameter. The present invention was completed by discovering a steel sheet for cans with excellent weldability, which has metal chromium plating applied to the upper layer and the entire surface of the steel strip, and furthermore, chromium oxide is formed on the upper layer.

本発明においては、鋼板（帯）を缶サイズに応じたサイ
ズのブランクに裁断した後円筒状に形成し、両端部を溶
接することにより、缶胴とする、その接合部に相当する
部分に予め溶接性を向上する効果のある上記Ｚｎメッキ
等を施すものであり、ストライプ状にメッキする間隔は
缶の大きさ、つまり缶径に応じて決定するものである。In the present invention, a steel plate (band) is cut into blanks of a size corresponding to the can size, then formed into a cylindrical shape, and both ends are welded to form the can body. The above-mentioned Zn plating, etc., which has the effect of improving weldability, is applied, and the interval between the striped plating is determined depending on the size of the can, that is, the diameter of the can.

か＼るストライプ状のメッキ巾は、両端部の溶接ラップ
代、溶接中剪断精度等を加味して決めるものであるが、
６〜１０Ｕ巾で十分である。又メッキ量としては、Ｏ，
１〜５．０　ｆ／ｒｒｔ”　　（Ｎｉ−Ｐメッキは０．
１−１．　Ｏｙ／ｍ”　）　　が適当である、約Ｏ２］
−２／イ以下であると溶接ｐ２向上する効果が少なく、
又約５．　ｔ）　’ｉ／／ｍ”以上にしても溶接性は比
例して効果の向上はない、むしろコスト的に不利となる
。The width of the striped plating is determined by considering the welding lap allowance at both ends, shear accuracy during welding, etc.
A width of 6 to 10 U is sufficient. Also, the amount of plating is O,
1 to 5.0 f/rrt” (Ni-P plating is 0.
1-1. Oy/m”) is suitable, approximately O2]
If it is less than -2/a, the effect of improving welding p2 will be small;
Also about 5. t) Even if the welding speed is increased to 'i//m' or more, there is no proportional improvement in the effect of weldability, but rather it becomes disadvantageous in terms of cost.

このようなストライプメッキが溶接性全向上する理由は
、その上層にメッキされる金属クロム等に比べ融点が低
いことから溶接時の熱によりストライプメッキ金属が金
属クロム等より先に溶解し、その上層にある金属クロム
等と共に加圧シこより溶接経過から一緒に排除され、溶
接位置には、溶接性を阻害する金属クロム等がほとんど
なくなるために溶接性を向上せしめることができるもの
である。The reason why such stripe plating completely improves weldability is that it has a lower melting point than the metal chromium etc. plated on the upper layer, so the stripe plating metal melts earlier than the metal chromium etc. due to the heat during welding, and the upper layer It is removed from the welding process together with the metal chromium etc. present in the welding area by the pressurized seal, and the welding position is almost completely free of metal chromium etc. which inhibits weldability, thereby improving weldability.

又このようなストライプメッキカ法としては、例えば特
開昭６０−２１３９２号に示すごとく、ロール表面の巾
方向に缶径に応じた間隔に溝全形成し、枝溝の底部に電
極を配置したロール金１対設け、該４にメッキＩ？光填
しつつ、ロールを回転し、鋼帯の表裏面ｔそれぞれのロ
ールに接触移動じつつ、鋼帯を陰極、溝に配置した電極
全陽極として通′社し、鋼帯にストライプメッキを施す
ものである。In addition, as such a stripe plating method, for example, as shown in Japanese Patent Application Laid-Open No. 60-21392, grooves are formed entirely in the width direction of the roll surface at intervals corresponding to the can diameter, and electrodes are placed at the bottom of the branch grooves. A pair of roll gold is provided, and plated I? While being filled with light, the rolls are rotated and the steel strip is used as a cathode, and the electrodes placed in the grooves are used as anodes, while the rolls are rotated and moved in contact with the rolls on each of the front and back sides of the steel strip, and stripe plating is applied to the steel strip. It is something.

しかしてこのようなストライプメッキは鋼帯に直接メッ
キし、次いで後述のごとく金属クロムメッキ等金施して
もよく、又金属クロムメッキ等の色調、耐食性等を向上
するためストライプメッキに先立って、鋼帯全面にＦｅ
　−Ｓｎ合金、Ｎｉ、Ｓｎ。However, such stripe plating may be performed by directly plating the steel strip, and then applying metal chrome plating or other metal plating as described below.Also, in order to improve the color tone, corrosion resistance, etc. of the metal chrome plating, the steel strip may be plated directly on the steel strip before stripe plating. Fe on the entire obi
-Sn alloy, Ni, Sn.

Ｎｘ−Ｐ等の甲から１種＋１ｊＱ０．０３〜０．５　ｆ
／ｍ’　メッキすることもできる。1 type from the instep of Nx-P etc.+1jQ0.03~0.5 f
/m' It can also be plated.

これらのメッキ、前述のストライプメッキは、すでに知
られているメッキ条件（メッキ液組成、電流密度等）で
有利にメッキすることができる。These platings, the above-mentioned stripe plating, can be advantageously performed under already known plating conditions (plating solution composition, current density, etc.).

次にこれらの上層に施す金属クロムは、１０〜２００　
ｍｖ／ｒｒ？　　（好ましくは６０〜１２０〜／イ）で
溶接性を向上し、かつ缶としての耐食性を付与すること
ができる、約１０　ｍｑ／ｒｒｉ’以下であると、鋼帯
（板）の耐食性が劣り、又約２００〜／ｍ′以上になる
と、前記のごとく、ストライプメッキ等してよる排除作
用が十分でなく、溶接性全低下させることかあり、好ま
しくない。Next, the metallic chromium applied to these upper layers is 10 to 200
mv/rr? (preferably from 60 to 120 mq/ri), it is possible to improve weldability and provide corrosion resistance as a can; when it is less than about 10 mq/rr, the corrosion resistance of the steel strip (plate) is poor; Moreover, if it exceeds about 200 m/m', the removal effect by stripe plating etc. will not be sufficient as mentioned above, and the weldability will be completely deteriorated, which is not preferable.

更にその上層に生成せしめるクロム酸化物は、５〜５ｏ
　＃Ｉ／ｄ　　（ｎ２化物中のＣｒ量）で上記ストライ
プメッキ、金４クロムメッキ量等の関係から溶接性、耐
食性等を向上させることがで、きる。Furthermore, the chromium oxide produced in the upper layer has a content of 5 to 50
#I/d (the amount of Cr in the n2 compound) can improve weldability, corrosion resistance, etc. from the relationship between the stripe plating and the amount of gold-4 chromium plating.

次に本発明の実施例全比較１夕１Ｊとともに挙げる。Next, all examples of the present invention will be compared with 1 J and 1 J.

注１：耐錆性は供試材を立てかけ工場、首庫内で６ケ月
間放置した後、供試材表面に発生１−でいた錆の程度を
評価した（錆面＠１．０％未満○、１．０％以上×） 注２　：耐食性はエボヤ゛′フェノール系缶用塗料を５
０　ｍ９／　ｄ　ｒに　菫Ａ焼付し、端面盆シールし、
カッターナイフで素地に達するスクラッチ（Ｓ　ｃｍ　
Ｘ　５　ｃｒｎ）を入れた後、１．５％クエン酸１．５
％食塩浴液１００　ｃｃに５０℃、３日浸漬した、その
後供試材を水洗、乾燥し、セロハンテープにより、塗膜
剥離を行ない、剥離中全測定した。（剥離中０．１　ｍ
Ａ未満○、０．１〜０．２１Δ、０．２藷以上×）注３
　：色調外観 供試材表面の色調、外観全目視検査した。。Note 1: Rust resistance was evaluated by the degree of rust that appeared on the surface of the test material after the test material was left standing in a factory or warehouse for 6 months (rust surface @ less than 1.0%). ○, 1.0% or more
0 m9/dr, violet A baked, end face tray sealed,
Scratch reaching the substrate with a cutter knife (S cm
X 5 crn), then 1.5% citric acid 1.5
The test material was immersed in 100 cc of % NaCl bath solution at 50° C. for 3 days, then washed with water, dried, and the coating film was peeled off using cellophane tape, and all measurements were taken during the peeling. (0.1 m during peeling
Less than A ○, 0.1 to 0.21Δ, 0.2 or more x) Note 3
: Color tone and appearance The color tone and appearance of the surface of the sample material were all visually inspected. .

（褐色気味Ｘ、暗灰色の全項光沢○） 注４　：溶接性 銅ワイヤーを中間電極とするシーム溶接機を用いてシー
ム溶接性を評価した。(Brownish X, dark gray overall gloss ○) Note 4: Seam weldability was evaluated using a seam welder using a weldable copper wire as an intermediate electrode.

供試材に、事前に２１０℃×２０分の空焼金施した、溶
接条件は、ラップ代０．６１１３、加圧力４０Ｋｐｆ、
　　スピード５０　ｍｐｍ　、電流周波数＋　００　Ｎ
２　、評価基準は、適正電流範囲の広さで決定。下限溶
接部強度、上限はチリ（溶融した鉄がスプラッシュ状に
突出したもの）の発生により規定した。（適正電流範囲
は２０ＯＡ以上を実用上問題なしとした。） 注５　ニスドライブメッキ巾は、８８巾でメッキした。The test material was preheated at 210°C for 20 minutes. The welding conditions were a lap thickness of 0.6113, a pressure of 40 Kpf,
Speed 50 mpm, current frequency + 00 N
2. The evaluation criteria is determined by the width of the appropriate current range. The lower limit was determined by the weld strength, and the upper limit was determined by the occurrence of dust (molten iron protruding in the form of a splash). (The appropriate current range is 20OA or more, which poses no practical problem.) Note 5: Varnish drive plating width is 88 width.

注６　：下地メッキのＦｅ−Ｓｎ合金は錫メツキ後加熱
処理した。（Ｆｅ　１９重量％、残Ｓｎ　）注７　コス
トライプメッキのＮｉ−５ｎ合金（Ｎｉ３５重量％、残
５ｎ）Ｚｎ−Ｓｎ合金（Ｚｎ　５０重量％、残Ｓｎ　）
、Ｎｉ−Ｐ合金ｃＮｌｚｘ量係、残Ｐ） （発明の効果） 不発明によれば、溶接性、耐錆性、耐食性等にすぐれた
缶用鋼板が得られる。Note 6: The Fe-Sn alloy used as the base plating was heat-treated after tin plating. (Fe 19% by weight, remaining Sn) Note 7 Costripe plated Ni-5n alloy (Ni 35% by weight, remaining 5n) Zn-Sn alloy (Zn 50% by weight, remaining Sn)
, Ni-P alloy cNlzx amount ratio, residual P) (Effects of the invention) According to the invention, a steel plate for cans having excellent weldability, rust resistance, corrosion resistance, etc. can be obtained.

即ち、通常のふりさく＄２５ＥＴ）の経済性不利益と、
薄りロムメッキ鋼版の溶接性の難点ケ解決した缶用鋼板
であり、工業的に大なる優れた効果が得られる。In other words, the economic disadvantage of normal furisaku ($25 ET),
This is a steel plate for cans that solves the problems of weldability of thin ROM-plated steel plates, and provides great industrial benefits.

Claims (2)

【特許請求の範囲】[Claims] （１）鋼帯表裏面巾方向に缶径に応じた間隔でストライ
プ状にＺｎ、Ｚｎ−Ｓｎ合金、Ｎｉ−Ｓｎ合金、Ｎｉ−
Ｐ合金の中１種をメッキし、その上層及び鋼帯全面に金
属クロムメッキを施し、更にその上層にクロム酸化物を
生成せしめた、溶接性に優れた缶用鋼板。(1) Zn, Zn-Sn alloy, Ni-Sn alloy, Ni-
A steel sheet for cans with excellent weldability, which is plated with one of the P alloys, the upper layer and the entire surface of the steel strip are plated with metallic chromium, and chromium oxide is formed on the upper layer. （２）鋼帯表裏面全面にＦｅ−Ｓｎ合金、Ｎｉ、Ｓｎ、
Ｎｉ−Ｐの中から１種をメッキし、その上層表裏面巾方
向に缶径に応じた間隔でストライプ状にＺｎ、Ｚｎ−Ｓ
ｎ合金、Ｎｉ−Ｓｎ合金、Ｎｉ−Ｐ合金の中１種をメッ
キし、その上層及び鋼帯全面に金属クロムメッキを施し
、更にその上層にクロム酸化物を生成せしめた、溶接性
に優れた缶用鋼板。(2) Fe-Sn alloy, Ni, Sn, on the entire front and back surfaces of the steel strip.
One type of Ni-P is plated, and the upper layer is coated with Zn and Zn-S in stripes at intervals according to the can diameter in the width direction of the front and back surfaces.
It is plated with one type of n-alloy, Ni-Sn alloy, or Ni-P alloy, and the upper layer and the entire surface of the steel strip are plated with metallic chromium, and furthermore, chromium oxide is formed on the upper layer, which has excellent weldability. Steel plate for cans.