TW201641711A - Steel sheet for can lids and method for producing same - Google Patents

Steel sheet for can lids and method for producing same Download PDF

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TW201641711A
TW201641711A TW105110309A TW105110309A TW201641711A TW 201641711 A TW201641711 A TW 201641711A TW 105110309 A TW105110309 A TW 105110309A TW 105110309 A TW105110309 A TW 105110309A TW 201641711 A TW201641711 A TW 201641711A
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steel sheet
lid
content
ypei
elongation
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TW105110309A
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TWI608107B (en
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Katsumi Kojima
Tomonari Hiraguchi
Takumi Tanaka
Hiroki Nakamaru
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Jfe Steel Corp
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0273—Final recrystallisation annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
    • C21D8/0473—Final recrystallisation annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
    • B21D51/44—Making closures, e.g. caps
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/004—Dispersions; Precipitations
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

A steel sheet for can lids, which contains, in mass%, 0.020-0.060% of C, 0.01-0.05% of Si, 0.20-0.60%of Mn, 0.001-0.100% of P, 0.008-0.020% of S, 0.0130-0.0190% of N, and from 0.005% to {-4.20 x N + 0.110}% of Al, with Mnf being 0.30% to 0.58% (inclusive), where Mnf = Mn - 1.7 x S, and with the balance made up of Fe and unavoidable impurities. The lower yield strength YP (N/mm2) and the yield point elongation YPEl (%) of this steel sheet for can lids after an aging treatment at 210 DEG C for 10 minutes satisfy YP ≥ 355, YPEl ≥ 2, YPEl ≥ (60/(YP - 355)) + 2 and YP ≤ 4.09 x YPEl + 476. A method for producing this steel sheet for can lids.

Description

罐蓋用鋼板及其製造方法 Steel plate for can lid and manufacturing method thereof

本發明係關於：食品罐頭和飲料罐頭等的罐蓋用鋼板及其製造方法。 The present invention relates to a steel sheet for can lids such as food cans and beverage cans, and a method for producing the same.

食品罐頭和飲料罐頭在其製造階段中，是要進行內容物的加熱殺菌處理。這個時候，罐的內外將產生壓力差，而將壓力作用在罐體。罐體主要是由罐身與罐蓋所構成的。兩者之中，罐身的形狀係可很容易將應力分散的圓筒形，因此即使有壓力作用在其身上也很少變形。另一方面，罐蓋之由平面所構成的部分較多，以平面來承受壓力因此較容易變形。罐蓋之過度的變形並不合宜，因此乃期待有人能夠提供：即使承受壓力也不易變形的罐蓋。 In the manufacturing stage of food cans and beverage cans, heat sterilization of the contents is required. At this time, a pressure difference will be generated inside and outside the tank, and pressure will be applied to the tank. The tank body is mainly composed of a can body and a can lid. Of the two, the shape of the can body is a cylindrical shape in which stress can be easily dispersed, so that even if there is pressure on the body, it is rarely deformed. On the other hand, the can lid has a large number of flat portions, and is subjected to pressure in a plane, so that it is easily deformed. Excessive deformation of the can lid is not suitable, so it is expected that someone can provide a can lid that is not easily deformed even under pressure.

用來抑制罐蓋因對抗壓力而產生的變形之方法，係可舉出：提高罐蓋用鋼板的耐壓強度的作法。下列專利文獻1~3所揭示的技術係關於：提高了耐壓強度之罐蓋用的鋼板的技術。 A method for suppressing deformation of the can lid due to resistance to pressure is a method of improving the pressure resistance of the steel sheet for a can lid. The techniques disclosed in the following Patent Documents 1 to 3 relate to a technique of a steel sheet for a can lid having improved pressure resistance.

專利文獻1所揭示的技術之高壓噴氣凹型底部罐用鋼板，係藉由規定了：將下降伏強度乘以板厚度之 乘積，來確保加工性，並且藉由規定了將時效後的上降伏強度乘以板厚度二次方後的數值之乘積，來確保耐壓強度。亦即，專利文獻1係揭示：具有高耐壓強度且加工性優異的高壓噴氣凹型底部罐用鋼板及其製造方法，該鋼板的組成分，以質量%計，係含有C：0.020%以上0.090%以下、Si：0.01%以上0.05%以下、Mn：0.05%以上0.60以下%、P：0.001%以上0.100%以下、S：0.001%以上0.025%以下、N：0.0010%以上且未達0.0070%、Al：0.010%以上且{-4.2×N的含量(%)+0.11}%以下，其餘部分是Fe以及不可避免的雜質，將板厚度設定為0.350mm以下；將下降伏強度(N/mm2)乘以前述板厚度(mm)之乘積設定為195(N/mm)以下；實施了軋縮率為10%的預先輥軋變形之後，再以25℃進行了10天的室溫時效處理之後，將上降伏強度(N/mm2)與板厚度(mm)二次方後的數值相乘之乘積設定為52.0N以上。 The steel sheet for a high-pressure jet concave bottom can of the technique disclosed in Patent Document 1 is defined by multiplying the falling strength by the thickness of the sheet to ensure workability, and by specifying the upper and lower strength after aging The product of the value after the square of the plate thickness is multiplied to ensure the withstand voltage. In other words, Patent Document 1 discloses a steel sheet for a high-pressure jet concave bottom tank having high pressure resistance and excellent workability, and a method for producing the same, wherein the composition of the steel sheet contains C: 0.020% or more and 0.090% by mass. % or less, Si: 0.01% or more and 0.05% or less, Mn: 0.05% or more and 0.60% or less, P: 0.001% or more and 0.100% or less, S: 0.001% or more and 0.025% or less, and N: 0.0010% or more and less than 0.0070%, Al: 0.010% or more and {-4.2×N content (%) + 0.11}% or less, and the rest is Fe and unavoidable impurities, and the thickness of the plate is set to 0.350 mm or less; the falling strength (N/mm 2 ) The product of the thickness (mm) of the above-mentioned plate is set to 195 (N/mm) or less; after the pre-rolling deformation of the rolling reduction of 10% is performed, after the room temperature aging treatment for 10 days at 25 ° C The product of multiplying the upper fall strength (N/mm 2 ) and the plate thickness (mm) by the square is set to 52.0 N or more.

又，專利文獻2所揭示的技術，係為了達成固溶強化而積極性地添加0.0075~0.013質量%的N，以提高耐壓強度之技術。亦即，專利文獻2所揭示的高壓噴氣罐蓋用鋼板及其製造方法，其鋼板的組成分以質量%計，係含有C：0.025~0.065%、Mn：0.10~0.28%、P：0.005~0.03%、Al：0.01~0.04%、N：0.0075~0.013%，將Si含量限制為0.05%以下，且將S含量限制為0.009%以下，其餘部分是Fe以及不可避免的雜質，時效處理後之在輥軋方向上的降伏強度YP係落在460~540MPa的 範圍，時效處理後之在輥軋方向上的總伸長率是15%以上，時效處理後之在輥軋方向上的降伏點伸長率ELYP是6%以下，以mm單位計量之板厚度t、以MPa單位計量之時效處理後之在輥軋方向上的降伏強度YP、以%單位計量之時效處理後之在輥軋方向上的降伏點伸長率ELYP是符合130≦t×YP×(1-ELYP/100)的關係。 Further, the technique disclosed in Patent Document 2 is a technique for positively adding 0.0075 to 0.013 mass% of N in order to achieve solid solution strengthening to improve the withstand voltage. In other words, the steel sheet for a high pressure jet can lid and the method for producing the same disclosed in Patent Document 2 have a composition of the steel sheet of C: 0.025 to 0.065%, Mn: 0.10 to 0.28%, and P: 0.005. 0.03%, Al: 0.01 to 0.04%, N: 0.0075 to 0.013%, the Si content is limited to 0.05% or less, and the S content is limited to 0.009% or less, and the balance is Fe and unavoidable impurities, after aging treatment The lodging strength YP in the rolling direction falls within the range of 460 to 540 MPa, and the total elongation in the rolling direction after the aging treatment is 15% or more, and the elongation at the rolling point in the rolling direction after the aging treatment EL YP is 6% or less, the plate thickness t measured in mm units, the undulation strength YP in the rolling direction after aging treatment in MPa units, and the aging treatment measured in % units in the rolling direction The elongation point elongation EL YP is in accordance with the relationship of 130≦t×YP×(1-EL YP /100).

又，專利文獻3所揭示的技術，相對於專利文獻1、專利文獻2是利用比較高的伸長率來獲得高強度的作法，改為較之專利文獻2的技術添加更多的N達到0.007~0.025%的程度，利用變形時效硬化來提高耐壓強度的技術。專利文獻3所揭示的具有高耐壓強度且加工性優異的高壓噴氣罐凹型底部用鋼板及其製造方法，其鋼板的組成分以質量%計，係含有C：0.02~0.10%、Si：0.01~0.5%、P：0.001~0.100%、S：0.001~0.020%、N：0.007~0.025%、Al：0.01~{-4.2×N(%)+0.11}%，並且當Mnf=Mn-1.71×S(惟，式中的Mn量、S量係鋼中的Mn含量(質量%)、S含量(質量%))時，Mnf為0.10%以上且未達0.30%，其餘部分是Fe以及不可避免的雜質。並且這個鋼板，板厚度是0.35(mm)以下，鋼板的下降伏強度(N/mm2)乘以板厚度(mm)的乘積為160(N/mm)以下，以10%的伸長率進行預先拉伸變形之後，再以25℃的條件進行10天的室溫時效處理後的上降伏強度(N/mm2)乘以板厚度(mm)的二次方後的數值的乘積為52.0(N)以上。 Further, the technique disclosed in Patent Document 3 is a method of obtaining high strength by using a relatively high elongation ratio with respect to Patent Document 1 and Patent Document 2, and more N is added to 0.007 as compared with the technique of Patent Document 2. A technique of increasing the compressive strength by deformation age hardening to the extent of 0.025%. The high-pressure jet can concave-type bottom steel sheet having high pressure resistance and excellent workability disclosed in Patent Document 3, and a method for producing the same, wherein the steel sheet has a composition of C: 0.02 to 0.10%, Si: 0.01. ~0.5%, P: 0.001~0.100%, S: 0.001~0.020%, N: 0.007~0.025%, Al: 0.01~{-4.2×N(%)+0.11}%, and when Mnf=Mn-1.71× S (except that the amount of Mn in the formula, the amount of Mn in the steel (% by mass), and the S content (% by mass)), Mnf is 0.10% or more and less than 0.30%, and the rest is Fe and inevitably Impurities. And this steel plate has a plate thickness of 0.35 (mm) or less, and the product of the falling strength (N/mm 2 ) of the steel plate multiplied by the thickness (mm) of the steel plate is 160 (N/mm) or less, and is advanced at an elongation of 10%. After the tensile deformation, the product of the upper and lower undulation strength (N/mm 2 ) multiplied by the square of the plate thickness (mm) after 5 days of room temperature aging treatment at 25 ° C was 52.0 (N). )the above.

〔先前技術文獻〕 [Previous Technical Literature] 〔專利文獻〕 [Patent Document]

專利文獻1：日本特開2013-147744號公報 Patent Document 1: Japanese Laid-Open Patent Publication No. 2013-147744

專利文獻2：國際公開第2012/077628號 Patent Document 2: International Publication No. 2012/077628

專利文獻3：日本特開2012-207305號公報 Patent Document 3: Japanese Laid-Open Patent Publication No. 2012-207305

然而，這些專利文獻1~3所揭示的技術都是關於使用在高壓噴氣罐的鋼板。而這種高壓噴氣罐的底蓋或凹型底部，為了要達到高耐壓強度，都是形成朝向罐體內面側膨凸(亦即，往內凹陷)的圓拱形狀，因此專利文獻1~3所揭示的技術並未考慮到：前述的食品罐頭等的罐體之在平板形狀的罐蓋很容易產生的因罐內外壓力差所導致的變形。 However, the techniques disclosed in these Patent Documents 1 to 3 are all related to steel sheets used in high pressure gas jet cans. In order to achieve high compressive strength, the bottom cover or the concave bottom of the high-pressure jet can be formed into a dome shape which is convex toward the surface of the can body (that is, recessed inward), and therefore Patent Documents 1 to 3 The disclosed technique does not take into account the deformation of the can body of the canned food such as the can in the flat plate shape which is easily caused by the pressure difference between the inside and the outside of the can.

是以，用來抑制：在食品罐頭等的罐體所使用之以平面構成的部分較多之平板形狀的罐蓋，很容易產生之因罐內外的壓力差所導致的變形的技術，尚未確立。因此，本發明係有鑒於這種情事而開發完成的，其目的是要提供：能夠抑制因罐內外的壓力差所導致的變形之罐蓋用鋼板及其製造方法。 Therefore, it is a technique for suppressing deformation of a flat plate-shaped can lid which is used in a can body such as a food can, which is easily formed by a pressure difference between the inside and the outside of the can, and has not yet been established. . Therefore, the present invention has been developed in view of such circumstances, and an object thereof is to provide a steel sheet for a can lid which can suppress deformation due to a pressure difference between the inside and the outside of the can and a method for producing the same.

本發明人等，乃針對於：鋼板的機械特性之對罐蓋的耐壓特性所造成的影響進行了檢討。其結果，找到了一種創見，就是：藉由適度地控制下降伏強度YP和降伏點伸長率YPEI，即使是在由平面構成的部分較多之平板形狀罐蓋的情況下，也能夠獲得良好的耐壓特性。 The inventors of the present invention have reviewed the influence of the mechanical properties of the steel sheet on the pressure resistance characteristics of the can lid. As a result, a finding was found that, by moderately controlling the falling yoke strength YP and the falling point elongation YPEI, even in the case of a flat plate-shaped can lid which is composed of a plurality of flat surfaces, good results can be obtained. Pressure resistance characteristics.

此外，也找到了另一種創見，就是：藉由增加N含量，將Al、Mn、S設定在特定的含量，並且將作為製造條件之胚料加熱溫度、熱軋的捲取溫度、調質輥軋的伸長率予以調整在既定的範圍的話，能夠獲得可符合上述的特定條件之機械特性。 In addition, another kind of originality has been found, that is, by increasing the N content, Al, Mn, and S are set to a specific content, and the billet heating temperature, the hot rolling coiling temperature, and the tempering roller are used as manufacturing conditions. When the elongation of the rolling is adjusted within a predetermined range, mechanical properties satisfying the above specific conditions can be obtained.

本發明就是基於上述的這兩種創見來開發完成的，其要旨如下。 The present invention has been developed based on the above two kinds of novelty, and the gist thereof is as follows.

〔1〕一種罐蓋用鋼板，以質量%計，係含有C：0.020~0.060%、Si：0.01~0.05%、Mn：0.20~0.60%、P：0.001~0.100%、S：0.008~0.020%、N：0.0130~0.0190%、Al：0.005%~{-4.20×N+0.110}%(惟，式中的N是鋼中的N含量(質量%))、當Mnf=Mn-1.7×S(惟，式中的Mn、S是鋼中的Mn含量(質量%)、S含量(質量%))的時候，Mnf為0.30%以上0.58%以下、 其餘部分是Fe以及不可避免的雜質；經過210℃×10分鐘的時效處理之後，下降伏強度YP(N/mm2)以及降伏點伸長率YPEI(%)係符合：YP≧355；YPEI≧2；而且YPEI≧(60/(YP-355))+2；以及YP≦4.09×YPEI+476的關係。 [1] A steel sheet for can lids containing C: 0.020 to 0.060%, Si: 0.01 to 0.05%, Mn: 0.20 to 0.60%, P: 0.001 to 0.100%, and S: 0.008 to 0.020%, by mass%. , N: 0.0130~0.0190%, Al: 0.005%~{-4.20×N+0.110}% (only, N in the formula is N content (% by mass) in steel), when Mnf=Mn-1.7×S ( However, when Mn and S in the formula are Mn content (% by mass) and S content (% by mass) in steel, Mnf is 0.30% or more and 0.58% or less, and the rest is Fe and unavoidable impurities; After aging treatment at °C × 10 minutes, the falling volt strength YP (N/mm 2 ) and the elongation at break YPEI (%) are in accordance with: YP ≧ 355; YPEI ≧ 2; and YPEI ≧ (60/(YP-355) ) +2; and the relationship of YP ≦ 4.09 × YPEI + 476.

〔2〕一種罐蓋用鋼板的製造方法，其是用來製造前述〔1〕所述的罐蓋用鋼板的製造方法，係先將鋼胚料再加熱到達1150℃以上的溫度；以捲取溫度為680℃以下的條件，來將再加熱後的鋼胚料進行熱軋，以製成熱軋鋼板；將該熱軋鋼板進行冷軋，以製成冷軋鋼板；將該冷軋鋼板進行再結晶退火；再以伸長率為3%以下的條件，來進行調質輥軋。 [2] A method for producing a steel sheet for a can lid, which is a method for producing the steel sheet for a can lid according to the above [1], which is to reheat the steel billet to a temperature of 1150 ° C or higher; The steel billet obtained by reheating is hot-rolled under the condition of a temperature of 680 ° C or lower to form a hot-rolled steel sheet; the hot-rolled steel sheet is cold-rolled to form a cold-rolled steel sheet; The recrystallization annealing was carried out, and the temper rolling was carried out under the conditions of an elongation of 3% or less.

根據本發明，係可獲得：能夠抑制因罐內外的壓力差所導致的變形之罐蓋用鋼板。 According to the present invention, it is possible to obtain a steel sheet for a can lid which is capable of suppressing deformation due to a pressure difference between the inside and the outside of the can.

1‧‧‧罐身 1‧‧‧ can body

2‧‧‧罐蓋 2‧‧‧ can lid

10‧‧‧罐體 10‧‧‧ tank

第1圖係顯示由罐身和罐蓋組成的罐體的外觀。 Figure 1 shows the appearance of a can body consisting of a can body and a can lid.

第2圖(a)係顯示罐蓋的形狀之平面圖，第2圖(b)係第2圖(a)中的A-A線的剖面圖。 Fig. 2(a) is a plan view showing the shape of the can lid, and Fig. 2(b) is a cross-sectional view taken along line A-A in Fig. 2(a).

第3圖係顯示針對於因罐蓋的內外壓力差所導致的變 形之罐蓋用鋼板的下降伏強度YP與降伏點伸長率YPEI所造成的影響，進行了評比後的結果之圖表。 Figure 3 shows the change caused by the pressure difference between the inside and the outside of the can lid. A graph showing the results of the evaluation of the effect of the falling strength YP of the steel sheet for the can lid and the elongation at the falling point YPEI.

本發明的罐蓋用鋼板，其組成分以質量%計，係含有C：0.020~0.060%、Si：0.01~0.05%、Mn：0.20~0.60%、P：0.001~0.100%、S：0.008~0.020%、N：0.0130~0.0190%、Al：0.005~{-4.20×N+0.110}%(惟，式中的N是鋼中的N含量(質量%))，當Mnf=Mn-1.7×S(惟，式中的Mn、S是鋼中的Mn含量(質量%)、S含量(質量%))的時候，Mnf為0.30%以上0.58%以下，其餘部分是Fe以及不可避免的雜質，經過210℃×10分鐘的時效處理之後，下降伏強度YP(N/mm2)以及降伏點伸長率YPEI(%)係符合：YP≧355；YPEI≧2；而且YPEI≧(60/(YP-355))+2；以及YP≦4.09×YPEI+476的關係。 The steel sheet for can lids of the present invention contains C: 0.020 to 0.060%, Si: 0.01 to 0.05%, Mn: 0.20 to 0.60%, P: 0.001 to 0.100%, and S: 0.0088 in terms of mass%. 0.020%, N: 0.0130~0.0190%, Al: 0.005~{-4.20×N+0.110}% (however, N in the formula is N content (% by mass) in steel), when Mnf=Mn-1.7×S (When Mn and S in the formula are Mn content (% by mass) and S content (% by mass) in steel), Mnf is 0.30% or more and 0.58% or less, and the rest is Fe and unavoidable impurities. After aging treatment at 210 ° C × 10 minutes, the falling volt strength YP (N / mm 2 ) and the elongation at break YPEI (%) are in accordance with: YP ≧ 355; YPEI ≧ 2; and YPEI ≧ (60 / (YP-355) )) +2; and the relationship of YP ≦ 4.09 × YPEI + 476.

以下將詳細說明本發明的罐蓋用鋼板及其製造方法。 Hereinafter, the steel sheet for a can lid of the present invention and a method for producing the same will be described in detail.

首先，說明本發明的罐蓋用鋼板之組成分。成分是以質量%計量。 First, the composition of the steel sheet for can lids of the present invention will be described. The ingredients are measured in mass %.

C：0.020~0.060% C: 0.020~0.060%

本發明的鋼板，係經過：熱軋、冷軋、再結晶退火、調質輥軋的各工序來製造的鋼板，必須要具備上述的機械 特性。為了符合這種特性，在本發明的鋼板中，含有作為固溶強化元素的C是很重要的，因此將C含量的下限設定為0.020%。C含量若未達0.020%的話，將會無法獲得本發明所規定的機械特性。此外，C含量係以0.030%以上為宜。另一方面，C含量若超過0.060%的話，將會過度硬質化，因而在進行蓋加工的時候，鋼板與加工模具之間的接觸面壓力變得很高，披覆在鋼板表面上的有機披覆膜將會受到損傷。因此，將C含量的上限設定為0.060%。此外，更好的C含量是0.050%以下。 The steel sheet of the present invention is a steel sheet which is produced by various steps of hot rolling, cold rolling, recrystallization annealing, and temper rolling, and must have the above-mentioned machine. characteristic. In order to satisfy such characteristics, it is important to contain C as a solid solution strengthening element in the steel sheet of the present invention, so the lower limit of the C content is set to 0.020%. If the C content is less than 0.020%, the mechanical properties specified in the present invention will not be obtained. Further, the C content is preferably 0.030% or more. On the other hand, if the C content exceeds 0.060%, it will be excessively hardened, so that when the cap processing is performed, the contact surface pressure between the steel sheet and the processing die becomes high, and the organic coating on the surface of the steel sheet is coated. The film will be damaged. Therefore, the upper limit of the C content is set to 0.060%. Further, a better C content is 0.050% or less.

Si：0.01~0.05% Si: 0.01~0.05%

Si是可對於固溶強化帶來有效的作用，但是含量太多的話，將會使得鋼板的耐腐蝕性變差。Si係在鋼板的原料之鐵礦石中大量含有，因而是在精煉階段予以除去並且調整其含量。在本發明的情況中，與Si對於固溶強化帶來的貢獻度相較，還是比較優先考量要排除Si會使耐腐蝕性變差的影響。因此，係將Si含量設定在對於耐腐蝕性的影響不太明顯的0.05%以下。更好的Si含量是0.03%以下。基於耐腐蝕性的觀點考量，最好是儘量降低Si含量，但是若過度地想要將Si含量降低的話，將使得精煉作業時的負荷增加，因此將其含量下限設定為0.01%。 Si is effective for solid solution strengthening, but if the content is too large, the corrosion resistance of the steel sheet will be deteriorated. The Si system is contained in a large amount in the iron ore of the raw material of the steel sheet, and thus is removed and adjusted in the refining stage. In the case of the present invention, compared with the contribution of Si to solid solution strengthening, it is preferable to consider the effect of eliminating Si to deteriorate the corrosion resistance. Therefore, the Si content is set to be 0.05% or less which is less noticeable for the corrosion resistance. A better Si content is 0.03% or less. From the viewpoint of corrosion resistance, it is preferable to reduce the Si content as much as possible. However, if the Si content is excessively lowered, the load during the refining operation is increased, so the lower limit of the content is set to 0.01%.

Mn：0.20~0.60% Mn: 0.20~0.60%

Mn是用來調整鋼板的強度之有效的元素，但Mn含 量未達0.20%的話，將無法獲得其效果。另一方面，Mn含量超過0.60%的話，鋼板的強度將變得太高。因此，將Mn含量設定為0.20%以上0.60%以下。Mn含量的下限側是設在0.25%以上為宜。上限側是設在0.55%以下為宜。 Mn is an effective element for adjusting the strength of the steel sheet, but Mn contains If the amount is less than 0.20%, the effect will not be obtained. On the other hand, if the Mn content exceeds 0.60%, the strength of the steel sheet will become too high. Therefore, the Mn content is set to be 0.20% or more and 0.60% or less. The lower limit side of the Mn content is preferably 0.25% or more. The upper limit side is preferably set to 0.55% or less.

P：0.001~0.100% P: 0.001~0.100%

P是具有很大的固溶強化能的元素，但是若其含量超過0.100%的話，耐腐蝕性將會明顯變差。因此，將P含量的上限設定為0.100%。更好的P含量是0.020%以下。另一方面，若要使P含量未達0.001%的話，必須耗費過大的脫磷成本。因此將P含量的下限設在0.001%。 P is an element having a large solid solution strengthening energy, but if the content exceeds 0.100%, the corrosion resistance will be remarkably deteriorated. Therefore, the upper limit of the P content is set to 0.100%. A better P content is 0.020% or less. On the other hand, if the P content is less than 0.001%, excessive dephosphorization costs must be incurred. Therefore, the lower limit of the P content is set to 0.001%.

S：0.008~0.020% S: 0.008 to 0.020%

S是會與鋼中的Mn結合而生成MnS。S含量若超過0.020%的話，在高溫時會在結晶粒界析出MnS，而成為造成鋼板脆化的原因。因此將S含量的上限設在0.020%。另一方面，若要使S含量未達0.008%的話，必須耗費過大的脫硫成本。因此將S含量的下限設在0.008%。 S is combined with Mn in steel to form MnS. When the S content exceeds 0.020%, MnS precipitates at the crystal grain boundary at a high temperature, which causes the steel plate to become brittle. Therefore, the upper limit of the S content is set to 0.020%. On the other hand, if the S content is less than 0.008%, excessive desulfurization costs must be incurred. Therefore, the lower limit of the S content is set to 0.008%.

N：0.0130~0.0190% N: 0.0130~0.0190%

N是對於固溶強化以及用來確保後述的降伏點伸長率YPEI很有幫助的元素。想要使其發揮這些效果，N含量必須是0.0130%以上。另一方面，N含量若超過0.0190%的話，將會導致：變形時效硬化的效果趨於飽和而無法再 有效地作用，或者導致熱間延性的惡化。因此將N含量的上限設在0.0190%。N含量的下限側是設在0.0135%以上為宜。上限側是設在0.0175%以下為宜。 N is an element which is useful for solid solution strengthening and for ensuring the elongation point elongation YPEI described later. In order to exert these effects, the N content must be 0.0130% or more. On the other hand, if the N content exceeds 0.0190%, it will cause: the effect of deformation age hardening tends to be saturated and can no longer be Effectively acts or causes deterioration of thermal ductility. Therefore, the upper limit of the N content is set to 0.0190%. The lower limit side of the N content is preferably set to 0.0135% or more. The upper limit side is preferably set to 0.0175% or less.

Al：0.005~{-4.20×N+0.110}%(惟，式中的N是鋼中的N含量(質量%)) Al: 0.005~{-4.20×N+0.110}% (however, N in the formula is the N content (% by mass) in the steel)

Al具有作為脫氧劑的作用，是用來提昇鋼板的清淨度所需的元素。又，在本發明中，係利用固溶N來確保機械特性。另一方面，Al會與鋼中的N結合而形成AlN。因此必須抑制AlN之過度的析出，必須限制Al量的上限。Al含量超過{-4.20×N含量(%)+0.110}%的話，AlN將會過度析出，而導致固溶N量變得不足之問題。另一方面，若是Al含量未達0.005%的鋼，將會因脫氧不足而使得鋼板的清淨度變差，所以將下限設在0.005%。此外，本發明中的Al是可溶於酸的Al。 Al has a function as a deoxidizer and is an element required for improving the cleanliness of the steel sheet. Further, in the present invention, solid solution N is used to secure mechanical properties. On the other hand, Al combines with N in the steel to form AlN. Therefore, it is necessary to suppress excessive precipitation of AlN, and it is necessary to limit the upper limit of the amount of Al. When the Al content exceeds {-4.20 × N content (%) + 0.110}%, AlN will excessively precipitate, resulting in a problem that the amount of solid solution N becomes insufficient. On the other hand, in the case of steel having an Al content of less than 0.005%, the degree of deterioration of the steel sheet is deteriorated due to insufficient deoxidation, so the lower limit is made 0.005%. Further, Al in the present invention is an acid-soluble Al.

當Mnf=Mn-1.7×S(惟，式中的Mn、S是鋼中的Mn含量(質量%)、S含量(質量%))的時候，Mnf為0.30%以上0.58%以下 When Mnf = Mn - 1.7 × S (however, Mn and S in the formula are Mn content (% by mass) and S content (% by mass) in steel), Mnf is 0.30% or more and 0.58% or less.

Mn是可藉由固溶強化、結晶粒的細粒化來使鋼板的強度增加。但是，Mn將會與S結合而形成MnS，因此對於固溶強化有幫助的Mn量，被視為是：從Mn含量減去可形成MnS的Mn量之後的量。 Mn is capable of increasing the strength of the steel sheet by solid solution strengthening and fine granulation of crystal grains. However, Mn will combine with S to form MnS. Therefore, the amount of Mn which contributes to solid solution strengthening is considered to be an amount obtained by subtracting the amount of Mn which can form MnS from the Mn content.

若考慮到Mn與S的原子量比的話，對於固溶強化有所幫助的Mn量，係可利用Mnf=Mn-1.7×S的數式來表示。Mnf若超過0.58%的話，使結晶粒徑變小的效果 將會變明顯而導致過度硬化。因此乃將Mnf設定為0.58%以下。更好的Mnf是0.53%以下。另一方面，Mnf若未達0.30%的話，將造成鋼板軟化而無法獲得所需的耐壓強度。因此乃將Mnf設在0.30%以上。更好的Mnf是設在0.33%以上。 When the atomic weight ratio of Mn to S is considered, the amount of Mn which contributes to solid solution strengthening can be expressed by a numerical formula of Mnf = Mn - 1.7 × S. If the Mnf exceeds 0.58%, the crystal grain size is reduced. Will become apparent and cause excessive hardening. Therefore, Mnf is set to 0.58% or less. A better Mnf is 0.53% or less. On the other hand, if the Mnf is less than 0.30%, the steel sheet is softened and the desired compressive strength cannot be obtained. Therefore, Mnf is set to 0.30% or more. A better Mnf is set at 0.33% or more.

其餘部分是Fe以及不可避的雜質。 The rest is Fe and unavoidable impurities.

此外，本發明的鋼板的組織係以不含波來鐵組織的組織為宜。波來鐵組織係指：肥粒鐵相與雪明鐵相析出成層狀的組織。有粗大的波來鐵組織存在的話，有時候將成為：在變形時因應力集中而發生裂隙的起點。將罐蓋捲緊安裝在罐身上的時候，如果有這種發生裂隙的起點存在的話，有可能會發展成為在捲緊部上的裂隙，因此，本發明的鋼板是以不含有波來鐵組織的組織為宜。這種不含有波來鐵組織的組織，係可藉由將冷軋時的軋縮率設在80%以上，並且將冷軋後之進行再結晶退火時的退火溫度，予以設定為未達Ac1變態點的作法而獲得。 Further, the structure of the steel sheet of the present invention is preferably a structure containing no ferrite structure. The Borne iron structure refers to a layered structure in which ferrite iron phase and snowy iron phase are precipitated. If there is a large wave of iron and iron, it will sometimes become the starting point of the crack due to stress concentration during deformation. When the can lid is wound up on the can body, if there is such a starting point for the occurrence of the crack, it may develop into a crack on the crimping portion, and therefore, the steel sheet of the present invention does not contain the Borne iron structure. The organization is appropriate. The structure which does not contain the ferritic structure can be set to be less than Ac by setting the rolling reduction ratio at the time of cold rolling to 80% or more and the annealing temperature at the time of recrystallization annealing after cold rolling. 1 obtained by the practice of metamorphosis.

其次，說明本發明的鋼板所應具備的機械特性。本發明人等，針對於鋼板的機械特性之對於罐蓋的耐壓特性造成的影響加以檢討。其結果，找到了一種創見，就是：藉由適度地控制下降伏強度YP、降伏點伸長率YPEI的話，即使是由平面構成的部分較多之平板形狀的蓋，也可以獲得具有良好的耐壓特性的罐蓋。 Next, the mechanical properties of the steel sheet of the present invention will be described. The present inventors reviewed the influence of the mechanical properties of the steel sheet on the withstand voltage characteristics of the can lid. As a result, it was found that, by moderately controlling the falling yoke strength YP and the falling point elongation YPEI, even a flat-shaped cover having a large number of flat portions can obtain a good withstand voltage. Characteristic can lid.

具體而言，本發明的鋼板，經過210℃×10分鐘的時效處理之後，下降伏強度YP(N/mm2)以及降 伏點伸長率YPEI(%)係符合：YP≧355；YPEI≧2；而且YPEI≧(60/(YP-355))+2；以及YP≦4.09×YPEI+476的關係。 Specifically, the steel sheet of the present invention, after aging treatment at 210 ° C for 10 minutes, the falling strength YP (N / mm 2 ) and the elongation point elongation YPEI (%) are in accordance with: YP ≧ 355; YPEI ≧ 2; Moreover, the relationship between YPEI≧(60/(YP-355))+2; and YP≦4.09×YPEI+476.

一般而言，為了抑制對抗壓力之罐蓋的變形，藉由提昇鋼板本身的剛性等，來提高罐蓋的剛性的作法是有效的。相對於此，本發明則是著眼於罐蓋的殘留應力。 In general, in order to suppress deformation of the can lid against pressure, it is effective to increase the rigidity of the can lid by increasing the rigidity of the steel sheet itself or the like. On the other hand, the present invention focuses on the residual stress of the can lid.

第1圖係顯示具有使用本發明的鋼板之罐蓋的罐體10的外觀。如第1圖所示，罐體10主要是由罐身1與罐蓋2所構成。又，第2圖(a)係顯示罐蓋2的形狀之平面圖，第2圖(b)係第2圖(a)中的A-A剖面圖。作為本發明的對象之食品罐頭和飲料罐頭等的罐蓋2，係如第2圖所示，係在外周部附近具有擴展環(請參考第2圖(b)中的元件符號x)。在這個擴展環將會產生因加工所造成的回彈，因而會在罐蓋2內部產生殘留應力。 Fig. 1 shows the appearance of a can body 10 having a can lid using the steel sheet of the present invention. As shown in Fig. 1, the can body 10 is mainly composed of a can body 1 and a can lid 2. Further, Fig. 2(a) is a plan view showing the shape of the can lid 2, and Fig. 2(b) is a cross-sectional view taken along line A-A of Fig. 2(a). As shown in Fig. 2, the can lid 2 of the food can and the beverage can, which are the object of the present invention, has an expansion ring in the vicinity of the outer peripheral portion (please refer to the component symbol x in Fig. 2(b)). In this expansion ring, there is a rebound caused by the machining, and thus residual stress is generated inside the can lid 2.

想要使回彈加大的話，提高鋼板的下降伏強度YP的作法是有效的。另一方面，作為本發明的對象之食品罐頭、飲料罐頭的罐蓋2，係如第2圖所示，係在中央部具有大致上平坦的區域。想要利用這個部分來產生殘留應力的話，提昇降伏點伸長率YPEI的作法是很有效的。換言之，藉由提昇降伏點伸長率YPEI的作法，係可使得罐蓋2的平坦部分產生不連續變形，而成為變形部與未變形部混合存在的狀態，如此一來，就可以使罐蓋2內 部產生殘留應力。 In order to increase the rebound, it is effective to increase the falling strength YP of the steel sheet. On the other hand, the can lid 2 of the canned food and the canned beverage which is the object of the present invention has a substantially flat region at the center portion as shown in Fig. 2 . To use this part to generate residual stress, it is effective to increase the elongation point YPEI. In other words, by increasing the elongation point elongation YPEI, the flat portion of the can lid 2 can be discontinuously deformed, and the deformation portion and the undeformed portion are mixed, so that the can lid 2 can be made. Inside Residual stress is generated in the part.

若想要使罐蓋2產生這種殘留應力，必須適度地調整下降伏強度YP與降伏點伸長率YPEI。第3圖係顯示針對於因罐蓋的內外壓力差所導致的變形之罐蓋用鋼板的下降伏強度YP與降伏點伸長率YPEI所造成的影響，進行了評比後的結果之圖表。第3圖所顯示的評比當中，係形成板厚度為0.251mm~0.277mm；通稱直徑為603(直徑是約6英吋再加上3/16英吋)的罐蓋，並且使用耐壓強度測試機，測定了這個罐蓋之因為內外的壓力差所導致的蓋的變形。具體而言，先將所成形後的罐蓋在大氣壓下，捲緊安裝在罐身之後，將加壓空氣注入罐內部而使罐內外壓差設為50kPa，並且測定了這個時候之罐蓋中央部的高度與捲緊部頂點的高度的差值。針對於其結果，將數值為4mm以下的視為合格，將超過4mm的視為不合格，合格者是標示○，不合格者是標示×。 If it is desired to cause such residual stress in the can lid 2, it is necessary to appropriately adjust the falling yoke strength YP and the falling point elongation YPEI. Fig. 3 is a graph showing the results of the evaluation after the influence of the falling strength YP of the steel sheet for can lids and the elongation at break YPEI for the deformation of the can lid due to the pressure difference between the inside and the outside of the can lid. In the comparison shown in Figure 3, the thickness of the plate is 0.251mm~0.277mm; the canopy with a diameter of 603 (about 6 inches in diameter plus 3/16 inch) is used, and the compressive strength test is used. The machine measures the deformation of the lid caused by the pressure difference between the inside and the outside. Specifically, the formed can lid was first placed under the atmospheric pressure, and after being wound up, the pressurized air was injected into the inside of the can to make the pressure difference between the inside and the outside of the can be set to 50 kPa, and the center of the can was measured at this time. The difference between the height of the part and the height of the apex of the crimp. For the results, a value of 4 mm or less was regarded as acceptable, and a value exceeding 4 mm was regarded as unqualified, and those who passed the test were marked with ○, and those who failed were marked with ×.

想要在罐蓋內產生殘留應力的話，被認為是下降伏強度YP、降伏點伸長率YPEI愈大愈有利，落在YPEI≧60/(YP-355)+2的領域內的話，蓋變形是合格的。另一方面，下降伏強度YP太高的話，蓋變形將會不合格，必須是YP≦4.09×YPEI+476。為何有這種機轉，就目前的現狀而言，雖然其理由還不太明確，但可以被推論認為是：如果下降伏強度YP太高的話，回彈將會變大，擴展環的形狀將會變得不一致，蓋的形狀將會變得不穩定之類的理由。 If it is desired to generate residual stress in the can lid, it is considered that the lowering strength YP and the lowering point elongation YPEI are more advantageous, and falling in the field of YPEI ≧ 60 / (YP-355) + 2, the cover deformation is qualified. On the other hand, if the falling volts YP is too high, the cover deformation will be unacceptable and must be YP ≦ 4.09 × YPEI + 476. Why is there such a mechanism? As far as the current status quo is concerned, although the reason is not clear, it can be inferred that if the drop strength YP is too high, the rebound will become larger and the shape of the extension ring will be It will become inconsistent, and the shape of the cover will become unstable.

此外，本發明的拉伸試驗，是可以使用日本工業規格JIS Z 2201「金屬材料拉伸試驗片」所規定的5號測試片，並且依據日本工業規格JIS Z 2241「金屬材料拉伸試驗方法」來進行。 In addition, in the tensile test of the present invention, the No. 5 test piece specified in Japanese Industrial Standard JIS Z 2201 "Metal Material Tensile Test Pieces" can be used, and according to Japanese Industrial Standard JIS Z 2241 "Metal Material Tensile Test Method" Come on.

降伏點伸長率YPEI，是採用：以尺標長度為50mm為基準時的伸長率。又，係以鋼板的輥軋方向，作為拉伸試驗時的拉伸方向。一般而言，鋼板的下降伏強度YP在輥軋方向上是最低的，當壓力作用在罐蓋而發生變形的時候，是從下降伏強度YP最低的輥軋方向開始發生變形，若考慮到罐蓋的耐壓舉動的話，這種考慮到下降伏強度YP最低的方向的作法，將可獲得耐壓強度的下限值，因此，係以鋼板的輥軋方向來當作拉伸方向。 The elongation at break point YPEI is obtained by using an elongation ratio based on a scale length of 50 mm. Further, the rolling direction of the steel sheet was taken as the stretching direction at the time of the tensile test. In general, the falling yoke strength YP of the steel sheet is the lowest in the rolling direction, and when the pressure acts on the can lid to deform, it is deformed from the rolling direction where the falling volt strength YP is the lowest, if the tank is considered In the case of the pressure resistance of the cover, the lower limit of the compressive strength can be obtained by taking into consideration the direction in which the falling strength YP is the lowest. Therefore, the rolling direction of the steel sheet is taken as the stretching direction.

這個下降伏強度YP，雖然係可藉由將成分、製造條件控制在適正的範圍的作法來進行調整，但是，Mn含量與S含量的控制、調質軋縮率的控制是特別重要。此外，這個降伏點伸長率YPEI，雖然係可藉由將成分、製造條件控制在適正的範圍的作法來進行調整，但是Al含量與N含量的控制、胚料加熱溫度、熱軋的捲取溫度的控制是特別重要。 Although the falling strength YP can be adjusted by controlling the composition and the production conditions to a proper range, it is particularly important to control the Mn content and the S content and control the temper rolling rate. In addition, this elongation point elongation YPEI can be adjusted by controlling the composition and manufacturing conditions to a proper range, but the Al content and the N content are controlled, the billet heating temperature, and the hot rolling coiling temperature. The control is especially important.

此外，在本發明中，下降伏強度YP(N/mm2)以及降伏點伸長率YPEI(%)的制定，雖然是從通稱直徑為603的罐蓋的實驗結果來制定的，但是因為罐蓋的直徑愈小的話，罐蓋之對於壓力的變形也變得愈小，所以上述的評比指標，亦可適用到直徑小於通稱直徑 為603的罐蓋之小直徑的罐蓋。 Further, in the present invention, the development of the falling strength YP (N/mm 2 ) and the elongation at break YPEI (%), although formulated from the experimental result of the can lid having a diameter of 603, is because the can lid The smaller the diameter, the smaller the deformation of the can lid against the pressure, so the above-mentioned evaluation index can also be applied to the can lid having a diameter smaller than the can lid having a diameter of 603.

其次，說明本發明的罐蓋用鋼板的製造方法之一例。 Next, an example of a method for producing a steel sheet for a can lid according to the present invention will be described.

本發明的鋼板，係經由：熱軋、冷軋、再結晶退火、調質輥軋、因應需要而實施的表面處理的各工序而製造的。茲詳細說明如下。 The steel sheet of the present invention is produced by hot rolling, cold rolling, recrystallization annealing, temper rolling, and various steps of surface treatment performed as needed. The details are as follows.

首先，具有上述的組成分的鋼胚料，係可藉由熔製、連續鑄造而製得。在連續鑄造的工序中，係可利用垂直彎曲型或彎曲型的連續鑄造機來製作胚料，並且將胚料被加諸彎曲或彎曲回直變形的區域中的角部的表面溫度，於以設定在800℃以下或者900℃以上為宜。藉此，可以避免在胚料的橫剖面上的長邊以及短邊的角部的裂開。 First, the steel blank having the above composition can be obtained by melting and continuous casting. In the continuous casting process, the blank can be made by a vertical bending type or a curved continuous casting machine, and the billet is applied to the surface temperature of the corner portion in the region where the billet is bent or bent back straight. It is preferable to set it to 800 ° C or less or 900 ° C or more. Thereby, the cracking of the long side and the corner of the short side in the cross section of the billet can be avoided.

然後，將鋼胚料以1150℃以上的溫度進行再加熱。藉由以1150℃以上的溫度來將胚料進行再加熱，可以使得在胚料冷卻的過程中所析出的AlN熔解。另一方面，為了防止因為加熱而產生的過度氧化，胚料加熱溫度是在1300℃以下為宜。此外，本發明中的胚料溫度係指：胚料的表面溫度。 Then, the steel billet is reheated at a temperature of 1150 ° C or higher. By reheating the billet at a temperature of 1150 ° C or higher, AlN precipitated during the cooling of the billet can be melted. On the other hand, in order to prevent excessive oxidation due to heating, the billet heating temperature is preferably 1300 ° C or lower. Further, the billet temperature in the present invention means: the surface temperature of the billet.

接下來，將胚料進行熱軋。這個時候，係將熱軋過程中的精製輥軋溫度，予以設定為Ar3點以上的溫度為宜。此外，捲取溫度係設在680℃以下，更好是未達680℃，更優是設在600℃以下。精製輥軋後的捲取溫度若超過680℃的話，AlN將會析出，因而無法獲得在本發 明中添加N的效果。此外，為了避免鋼板過度硬質化，捲取溫度係設在540℃以上為宜。此外，捲取溫度係指：鋼板表面溫度。 Next, the billet is hot rolled. At this time, it is preferable to set the refining rolling temperature in the hot rolling process to a temperature of Ar 3 or more. Further, the coiling temperature is set to 680 ° C or lower, more preferably 680 ° C or less, and more preferably 600 ° C or less. When the coiling temperature after the refining rolling exceeds 680 ° C, AlN will precipitate, and thus the effect of adding N in the present invention cannot be obtained. Further, in order to prevent the steel sheet from being excessively hardened, the coiling temperature is preferably set at 540 ° C or higher. In addition, the coiling temperature means: the surface temperature of the steel sheet.

熱軋後，對於冷卻後的熱軋鋼板(熱軋鋼帶)進行除去鏽皮為宜。除去鏽皮的方法係可適用各種的方法，例如：可適用酸洗的這種化學方式的除去方法、物理方式的除去方法等等的各種方法。如果是採用酸洗的話，係可依照硫酸法、鹽酸法之類的一般常用方法來進行。 After the hot rolling, it is preferred to remove the scale from the hot-rolled steel sheet (hot-rolled steel strip) after cooling. The method of removing the scale can be applied to various methods, for example, various methods such as a chemical removal method of pickling, a physical removal method, and the like. If it is pickled, it can be carried out according to a general method such as a sulfuric acid method or a hydrochloric acid method.

接下來，進行冷軋。冷軋係以80%以上的軋縮率來進行為宜。藉由將冷軋時的軋縮率設為80%以上，可將熱軋後所生成的波來鐵組織予以打碎。若冷軋時的軋縮率未達80%的話，會有讓波來鐵組織殘留下來的可能性。另一方面，冷軋時的軋縮率的上限，為了要避免因過大的軋縮率而導致輥軋機的負荷增大，以及因負荷增大而伴隨發生的輥軋不良的情事，係設在95%為宜。 Next, cold rolling is performed. The cold rolling is preferably carried out at a rolling reduction ratio of 80% or more. By setting the rolling reduction ratio at the time of cold rolling to 80% or more, the wave-forming iron structure generated after hot rolling can be broken. If the rolling reduction rate during cold rolling is less than 80%, there is a possibility that the iron structure remains. On the other hand, the upper limit of the rolling reduction ratio at the time of cold rolling is to avoid an increase in the load of the rolling mill due to an excessively large rolling reduction ratio, and a rolling failure accompanying an increase in load. 95% is appropriate.

接下來，冷軋之後，實施再結晶退火。再結晶退火係實施連續退火為宜。若是採用封箱退火的話，固溶N將會以AlN的形態析出，有時候會無法獲得室溫變形時效硬化。此外，退火溫度是設在未達Ac1變態點為宜。 Next, after cold rolling, recrystallization annealing is performed. The recrystallization annealing is preferably carried out by continuous annealing. If it is sealed by annealing, the solid solution N will precipitate in the form of AlN, and sometimes it will not be able to obtain room temperature deformation age hardening. In addition, the annealing temperature is preferably set at a point where the Ac 1 metamorphosis is not reached.

退火溫度若設在Ac1變態點以上的話，在退火中，將會生成沃斯田鐵相，有時候會形成：在進行罐蓋的加工時之成為裂隙的起點之波來鐵組織。在本發明中，Ac1變態 點(℃)係可藉由：示差熱分析來求得。又，退火溫度係測定鋼板表面的溫度。 If the annealing temperature is set at or above the Ac 1 metamorphic point, the Worthite iron phase will be formed during the annealing, and sometimes a wave structure which becomes the starting point of the crack during the processing of the can lid is formed. In the present invention, the Ac 1 metamorphic point (°C) can be obtained by: differential thermal analysis. Further, the annealing temperature is a measure of the temperature of the surface of the steel sheet.

退火後，為了使鋼板具有既定的機械特性、表面粗糙度，乃又進行調質輥軋。調質輥軋時的伸長率愈高的話，下降伏強度YP將變得愈高，但另一方面，降伏點伸長率YPEI則是會減少。為了取得本發明所需的下降伏強度與降伏點伸長率的平衡點，係將伸長率設在3%以下。另一方面，為了獲得既定的表面粗糙度，係將伸長率設在0.8%以上為宜。 After the annealing, in order to impart a predetermined mechanical property and surface roughness to the steel sheet, the temper rolling is performed. The higher the elongation at the time of temper rolling, the higher the falling yoke strength YP becomes, but on the other hand, the elongation at break YPEI is reduced. In order to obtain the balance between the falling strength and the elongation at break point required for the present invention, the elongation is set to 3% or less. On the other hand, in order to obtain a predetermined surface roughness, it is preferred to set the elongation to 0.8% or more.

利用以上的製造條件，可製造出本發明的罐蓋用鋼板。 The steel sheet for a can lid of the present invention can be produced by the above production conditions.

利用上述條件所製造出來的鋼板，係當作：表面處理鋼板用的原板來使用。本發明的效果，並不會受到表面處理的種類之影響，因此並不限定表面處理的種類。具有代表性的罐用表面處理之例子，係可舉出：鍍錫(馬口鐵)、鍍鉻(無錫鋼板)之類的金屬、金屬氧化物、金屬氫氧化物、無機鹽等之披覆處理、進一步在這些披覆處理的上層再披覆有機樹脂披覆膜，例如：進行多層披覆處理等。在這些表面處理中，有時候係對於鋼板實施加熱處理，鋼板將會因該加熱處理而受到時效。此外，鋼板在被加工成為罐蓋之前的被保管期間，也會承受到與保管溫度以及保管期間相應的時效。而且，對於鋼板進行塗裝的情況也會承受到時效。但是，這些在原板狀態下的時效，並不會影響到本發明的效果，這一點已經被確認了。 The steel sheet produced by the above conditions is used as an original sheet for surface-treated steel sheets. The effects of the present invention are not affected by the type of surface treatment, and thus the type of surface treatment is not limited. Typical examples of surface treatment for cans include coating treatment of metals such as tin plating (tinplate), chrome plating (tin-free steel sheets), metal oxides, metal hydroxides, inorganic salts, and the like. The upper layer of these coating treatments is further coated with an organic resin coating film, for example, a multilayer coating treatment. In these surface treatments, sometimes the steel sheet is subjected to heat treatment, and the steel sheet is aged by the heat treatment. In addition, the steel sheet is also subjected to the aging time corresponding to the storage temperature and the storage period during storage before being processed into the can lid. Moreover, the application of the steel sheet is also subject to aging. However, the aging in the original state does not affect the effects of the present invention, and this has been confirmed.

〔實施例〕 [Examples]

以下，係說明本發明的實施例。首先，熔製出具有如表1所示的組成分的鋼，再以表2~4所示的胚料加熱溫度對於胚料進行加熱，以表2~4所示的捲取溫度來進行熱軋，在進行過冷軋之後，實施再結晶退火，以表2~4所示的伸長率進行調質輥軋而製成鋼板。 Hereinafter, embodiments of the invention will be described. First, the steel having the composition shown in Table 1 is melted, and the billet is heated by the billet heating temperature shown in Tables 2 to 4, and the coiling temperature shown in Tables 2 to 4 is used for heat. After rolling, after cold rolling, recrystallization annealing was carried out, and temper rolling was performed at the elongation shown in Tables 2 to 4 to obtain a steel sheet.

此外，在表1中，鋼K是跳過的編號。在表2~4中，編號34~37是跳過的編號。 Further, in Table 1, steel K is a skipped number. In Tables 2 to 4, numbers 34 to 37 are skipped numbers.

然後，進行210℃×10分鐘的人工時效處理。針對於以上述製造工序而製得的鋼板，採用日本工業規格JIS Z 2201「金屬材料拉伸試驗片」所規定的5號測試片，利用依據日本工業規格JIS Z 2241「金屬材料拉伸試驗方法」的拉伸試驗，測定了下降伏強度(YP)、降伏點伸長率(YPEI)。針對這些結果，根據下列的判定條件1、判定條件2來判定是否合格。此處，係將符合判定條件的予以標示為○，不符合的予以標示為×。 Then, artificial aging treatment at 210 ° C for 10 minutes was performed. For the steel sheet obtained by the above-mentioned manufacturing process, the No. 5 test piece specified in Japanese Industrial Standard JIS Z 2201 "Metal Material Tensile Test Piece" is used, and the tensile test method for metal materials according to Japanese Industrial Standard JIS Z 2241 is used. The tensile test measured the drop strength (YP) and the elongation at break (YPEI). Based on these results, it is determined whether or not the pass is determined based on the following determination condition 1 and determination condition 2. Here, the condition that meets the judgment condition is indicated as ○, and the non-conformity is marked as ×.

此外，將所製得的鋼板，加工成形為603直徑蓋之後，捲緊到罐身上，在將罐內部的壓力加壓到達50kPa，測定了以捲緊部為基準之罐蓋中央部的高度。如果這個測定值為4mm以下的話，就予以判斷為合格(○)，以這種方式來對於耐壓特性進行評比。 Further, the obtained steel sheet was processed into a 603-diameter cover, and then wound up to the can body, and the pressure inside the can was pressurized to 50 kPa, and the height of the center portion of the can lid based on the crimping portion was measured. If the measured value is 4 mm or less, it is judged as pass (○), and the withstand voltage characteristics are evaluated in this manner.

如表2~4所示，本發明例也就是只要是判定條件1、判定條件2都合格的話，耐壓特性也就合格。是以，本發明例係可獲得：可抑制對抗壓力的變形之罐蓋用鋼板。 As shown in Tables 2 to 4, in the example of the present invention, as long as the determination condition 1 and the determination condition 2 are both acceptable, the withstand voltage characteristics are also acceptable. Therefore, in the example of the present invention, a steel sheet for a can lid which can suppress deformation against pressure can be obtained.

判定條件1 Judgment condition 1

經過210℃×10分鐘的人工時效處理後，下降伏強度YP(N/mm2)以及降伏點伸長率YPEI(%)係符合YP≧355、YPEI≧2、而且YPEI≧(60/(YP-355))+2的關係。 After artificial aging treatment at 210 ° C for 10 minutes, the falling volt strength YP (N / mm 2 ) and the elongation point elongation YPEI (%) are in accordance with YP ≧ 355, YPEI ≧ 2, and YPEI ≧ (60 / (YP- 355)) The relationship of +2.

判定條件2 Judgment condition 2

經過210℃×10分鐘的人工時效處理後，下降伏強度YP(N/mm2)以及降伏點伸長率YPEI(%)係符合YP≦4.09×YPEI+476的關係。 After the artificial aging treatment at 210 ° C for 10 minutes, the falling volt strength YP (N / mm 2 ) and the elongation at break YPEI (%) are in accordance with the relationship of YP ≦ 4.09 × YPEI + 476.

Claims (2)

一種罐蓋用鋼板，以質量%計，係含有C：0.020~0.060%、Si：0.01~0.05%、Mn：0.20~0.60%、P：0.001~0.100%、S：0.008~0.020%、N：0.0130~0.0190%、Al：0.005%~{-4.20×N+0.110}%(惟，式中的N是鋼中的N含量(質量%))、當Mnf=Mn-1.7×S(惟，式中的Mn、S是鋼中的Mn含量(質量%)、S含量(質量%))的時候，Mnf為0.30%以上0.58%以下、其餘部分是Fe以及不可避免的雜質；經過210℃×10分鐘的時效處理之後，下降伏強度YP(N/mm2)以及降伏點伸長率YPEI(%)係符合：YP≧355；YPEI≧2；而且YPEI≧(60/(YP、355))+2；以及YP≦4.09×YPEI+476的關係。 A steel sheet for a can lid, in terms of mass%, contains C: 0.020 to 0.060%, Si: 0.01 to 0.05%, Mn: 0.20 to 0.60%, P: 0.001 to 0.100%, S: 0.008 to 0.020%, N: 0.0130~0.0190%, Al: 0.005%~{-4.20×N+0.110}% (only, N in the formula is N content (% by mass) in steel), when Mnf=Mn-1.7×S (only, When Mn and S in the steel are Mn content (% by mass) and S content (% by mass) in steel, Mnf is 0.30% or more and 0.58% or less, and the rest is Fe and unavoidable impurities; after 210 ° C × 10 After the minute aging treatment, the falling volts strength YP (N/mm 2 ) and the elongation point elongation YPEI (%) are in accordance with: YP ≧ 355; YPEI ≧ 2; and YPEI ≧ (60 / (YP, 355)) + 2 And the relationship between YP≦4.09×YPEI+476. 一種罐蓋用鋼板的製造方法，其係用來製造如請求項1所述的罐蓋用鋼板，係先將鋼胚料再加熱到達1150℃以上的溫度；以捲取溫度為680℃以下的條件，來將再加熱後的鋼胚料進行熱軋，以製成熱軋鋼板； 將該熱軋鋼板進行冷軋，以製成冷軋鋼板；將該冷軋鋼板進行再結晶退火；再以伸長率為3%以下的條件，來進行調質輥軋。 A method for producing a steel sheet for a can lid, which is used for manufacturing the steel sheet for a can lid according to claim 1, wherein the steel billet is first heated to a temperature of 1150 ° C or higher; and the coiling temperature is 680 ° C or lower. a condition for hot rolling the reheated steel billet to form a hot rolled steel sheet; The hot-rolled steel sheet is cold-rolled to obtain a cold-rolled steel sheet; the cold-rolled steel sheet is subjected to recrystallization annealing; and the temper rolling is performed under the conditions of an elongation of 3% or less.
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