TW201636433A - Steel sheet for crown cap, manufacturing method therefor, and crown cap - Google Patents

Steel sheet for crown cap, manufacturing method therefor, and crown cap Download PDF

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TW201636433A
TW201636433A TW104139167A TW104139167A TW201636433A TW 201636433 A TW201636433 A TW 201636433A TW 104139167 A TW104139167 A TW 104139167A TW 104139167 A TW104139167 A TW 104139167A TW 201636433 A TW201636433 A TW 201636433A
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rolling
less
strength
crown cap
steel sheet
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TW104139167A
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Chinese (zh)
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TWI601830B (en
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Takumi Tanaka
Tomonari Hiraguchi
Katsumi Kojima
Hiroki Nakamaru
Nobusuke Kariya
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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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
    • B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
    • B65D41/10—Caps or cap-like covers adapted to be secured in position by permanent deformation of the wall-engaging parts
    • B65D41/12—Caps or cap-like covers adapted to be secured in position by permanent deformation of the wall-engaging parts made of relatively stiff metallic materials, e.g. crown 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
    • 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
    • C21D8/04—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
    • C21D8/0421—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 working steps
    • C21D8/0436—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
    • C21D8/04—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
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • 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
    • 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
    • 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn

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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)
  • Heat Treatment Of Steel (AREA)
  • Closures For Containers (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

Provided are: a steel sheet for a crown cap that has adequate strength and moldability even when used after being made thin; a manufacturing method therefor; and a crown cap. The steel sheet has a composition containing, in mass%, C: 0.010% to 0.025%, Si: not more than 0.10%, Mn: 0.05% to 0.50%, P: not more than0.050%, S: 0.005% to 0.050%, Al: 0.020% to 0.070%, and N: less than 0.0040%, the balance being obtained from Fe and unavoidable impurities. Regarding yield strength after heat treatment for fifteen minutes at 210 DEG C, yield strength in the rolling direction is at least 550 MPa and yield strength in the rolling plane in a direction that is 45 DEG from the rolling direction is not more than the mean of the yield strength in the rolling direction and the yield strength in the rolling plane in a direction that is 90 DEG from the rolling direction.

Description

王冠蓋用鋼板及其製造方法以及王冠蓋 Steel plate for crown cap, its manufacturing method and crown cap

本發明係關於用於作為玻璃瓶瓶蓋之王冠蓋之材料的鋼板及其製造方法以及王冠蓋。 The present invention relates to a steel sheet used as a material for a crown cap of a glass bottle cap, a method of manufacturing the same, and a crown cap.

自古以來於清涼飲料或酒類等之飲料用容器多使用玻璃瓶，而於細口玻璃瓶多使用稱為王冠蓋之金屬製的瓶蓋。一般而言，王冠蓋係以薄鋼板為素材藉由加壓成形而製造，由塞住瓶口之圓盤狀的部分與設於其周圍之皺褶狀的部分而成，藉由將皺褶狀的部分鉚接於瓶口而將瓶密封。 Since ancient times, glass bottles have been used for beverage containers such as refreshing drinks or alcohols, and metal bottle caps called crown caps are often used in thin-mouth glass bottles. In general, the crown cap is made of a thin steel plate by press molding, and is formed by plugging a disc-shaped portion of the bottle mouth and a wrinkled portion provided around the bottle mouth, by wrinkles The shaped portion is riveted to the mouth of the bottle to seal the bottle.

作為成為王冠蓋素材之薄鋼板所必要的特性，可舉例強度與成形性。可用王冠蓋之瓶中，填充啤酒或碳酸飲料等會產生內壓之內容物為多。必須要有的強度為在因溫度變化等而內壓升高時，不會王冠蓋變形而瓶之密封被破壞。又，即使素材之強度充分，缺乏成形性時會產生皺褶之形狀變得不均勻，即使鉚接於瓶口亦無法得到充分的密封性之情形。 As a characteristic necessary for a steel sheet to be a crown material, strength and formability can be exemplified. In the bottle that can be covered with a crown, there is a lot of content that causes internal pressure, such as beer or carbonated beverage. The strength must be such that when the internal pressure rises due to temperature changes or the like, the crown of the crown is not deformed and the seal of the bottle is broken. Further, even if the strength of the material is sufficient, the shape of the wrinkles is not uniform when the formability is lacking, and sufficient sealing property cannot be obtained even if the material is swaged at the mouth of the bottle.

作為王冠蓋素材之薄鋼板主要使用SR(Single Reduced)鋼板。SR鋼板藉由以冷軋使鋼板變薄後，施以退火，進行調質壓延而製造。以往，王冠蓋素材之板厚為0.20mm以上，藉由運用用於食品或飲料之罐等的軟鋼作為素材之SR材料可確保充分的強度與成形性。 The thin steel plate used as the material of the crown cover mainly uses SR (Single) Reduced) steel plate. The SR steel sheet is produced by subjecting the steel sheet to a thickness by cold rolling, annealing, and temper rolling. In the past, the thickness of the crown material was 0.20 mm or more, and sufficient strength and formability were ensured by using SR made of soft steel for food or beverage cans.

然而，近年來，與罐用鋼板相同，王冠蓋素材亦以降低成本為目的而薄化的要求增高。王冠蓋素材之板厚若要成為未達0.20mm，則以往之SR鋼板強度變得不足。為了確保強度，考慮退火之後施以二次冷軋之DR(Double Reduced)鋼板的運用。但是，若二次冷軋率變大則成形性降低，產生瓶之密封不良。 However, in recent years, as with the steel sheet for cans, the material of the crown cover has been increased in order to reduce the cost. If the thickness of the crown material is less than 0.20 mm, the strength of the conventional SR steel sheet becomes insufficient. In order to secure the strength, the use of a DR (Double Reduced) steel plate subjected to secondary cold rolling after annealing is considered. However, if the secondary cold rolling ratio is increased, the formability is lowered, and the sealing of the bottle is poor.

因應上述，至今為止，為了得到強度與成形性兩者優異的鋼板，提案有如以下之技術。 In view of the above, in order to obtain a steel sheet excellent in both strength and moldability, the following techniques have been proposed.

專利文獻1中揭示一種罐強度、罐成形性優異之容器用極薄軟質鋼板，其特徵為以重量%計含有N：0.0040~0.0300%、Al：0.005~0.080%，0.2%耐力：430MPa以下，總伸長：15~40%，內部摩擦之Q-1：0.0010以上。 Patent Document 1 discloses an ultra-thin soft steel sheet for containers having excellent pot strength and pot formability, and is characterized by containing N: 0.0040 to 0.0300%, Al: 0.005 to 0.080%, and 0.2% resistance: 430 MPa or less in terms of % by weight. Total elongation: 15~40%, internal friction Q -1 : 0.0010 or more.

專利文獻2中揭示一種高強度高加工性罐用鋼板，其特徵為以質量%計含有C：0.001~0.080%、Si：0.003~0.100%、Mn：0.10~0.80%、P：0.001~0.100%、S：0.001~0.020%、Al：0.005~0.100%、N：0.0050~0.0150%、B：0.0002~0.0050%，以面積率計包含0.01~1.00%之壓延方向剖面之晶粒的展伸度為5.0以上之晶粒。 Patent Document 2 discloses a steel sheet for high strength and high workability, which is characterized by containing C: 0.001 to 0.080%, Si: 0.003 to 0.100%, Mn: 0.10 to 0.80%, and P: 0.001 to 0.100% by mass%. , S: 0.001 to 0.020%, Al: 0.005 to 0.100%, N: 0.0050 to 0.0150%, B: 0.0002 to 0.0050%, and the elongation of the crystal grains including the 0.01 to 1.00% rolling direction section by area ratio is More than 5.0 grains.

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

專利文獻1：日本特開2001-49383號公報 Patent Document 1: Japanese Patent Laid-Open Publication No. 2001-49383

專利文獻2：日本特開2013-28842號公報 Patent Document 2: Japanese Patent Laid-Open Publication No. 2013-28842

然而，上述以往技術可舉出下述所示之問題。 However, the above conventional techniques can be exemplified by the problems described below.

由於專利文獻1所記載之鋼板為軟質且含有很多N，為了得到必要之強度則必須使二次冷軋率變大。若使二次冷軋率變大則異向性亦變大，有損加工性。 Since the steel sheet described in Patent Document 1 is soft and contains a large amount of N, it is necessary to increase the secondary cold rolling ratio in order to obtain the necessary strength. When the secondary cold rolling ratio is increased, the anisotropy is also increased, and the workability is impaired.

專利文獻2所記載之鋼板亦與專利文獻1所記載之鋼板相同，由於N之含量多，難以兼具王冠蓋素材所要求的強度與加工性。 The steel plate described in Patent Document 2 is also the same as the steel plate described in Patent Document 1. Since the content of N is large, it is difficult to achieve the strength and workability required for the crown material.

本發明係鑑於上述事情所成者，目的為提供一種王冠蓋用鋼板，其解決上述以往技術的問題，即使薄化使用亦具備充分的強度與成形性，以及提供該王冠蓋用鋼板之製造方法以及王冠蓋。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a steel sheet for a crown cap which solves the problems of the prior art described above, and which has sufficient strength and formability even when used for thinning, and a method for producing the steel sheet for the crown cap. And the crown cap.

本發明者為了解決上述課題進行深入研究。其結果，發現藉由使鋼成分、熱軋條件、退火條件及二次冷軋條件(DR條件)最佳化，得到具備充分之強度與成形 性的王冠蓋用鋼板。 The present inventors conducted intensive studies in order to solve the above problems. As a result, it was found that sufficient strength and formation were obtained by optimizing the steel component, hot rolling conditions, annealing conditions, and secondary cold rolling conditions (DR conditions). The crown of the sexual crown is made of steel.

本發明係基於以上見解所成者，以下述為要旨。 The present invention has been made based on the above findings, and the following is the gist of the invention.

[1]一種王冠蓋用鋼板，其具有由以質量%計含有C：0.010%以上0.025%以下、Si：0.10%以下、Mn：0.05%以上0.50%以下、P：0.050%以下、S：0.005%以上0.050%以下、Al：0.020%以上0.070%以下、N：未滿0.0040%，且剩餘部分為Fe及不可避免的雜質而成之成分組成，其210℃、15分鐘之熱處理後的降伏強度為：壓延方向之降伏強度為550MPa以上，壓延面內之與壓延方向成45°之方向的降伏強度為壓延方向之降伏強度和壓延面內之與壓延方向成90°之方向的降伏強度之平均值以下。 [1] A steel sheet for a crown cap comprising C: 0.010% or more and 0.025% or less, Si: 0.10% or less, Mn: 0.05% or more and 0.50% or less, P: 0.050% or less, and S: 0.005 by mass%. % or more of 0.050% or less, Al: 0.020% or more and 0.070% or less, N: less than 0.0040%, and the remainder is Fe and inevitable impurities, and the composition of the composition is 210 ° C, 15 minutes after the heat treatment The undulation strength of the rolling direction is 550 MPa or more, and the undulation strength in the direction of the rolling surface in the direction of 45° is the undulation strength in the rolling direction and the undulation strength in the direction of the rolling surface in the direction of 90° from the rolling direction. Below the value.

[2]一種王冠蓋用鋼板之製造方法，其係製造如上述[1]之王冠蓋用鋼板之製造方法，其具有下述步驟：將鋼胚進行熱軋，並以捲取溫度530℃以上590℃以下進行捲取之熱軋步驟、前述熱軋步驟後，進行冷軋之一次冷軋步驟、前述一次冷軋步驟後，以退火溫度650℃以上720℃以下進行退火之退火步驟、及前述退火步驟後，以壓延率25%以上40%以下進行二次冷軋之二次冷軋步驟。 [2] A method for producing a steel sheet for a crown cap, which is a method for producing a steel sheet for a crown cap according to the above [1], which comprises the steps of: hot rolling a steel billet at a coiling temperature of 530 ° C or higher After the hot rolling step of 590 ° C or less, the hot rolling step, the cold rolling step and the primary cold rolling step, the annealing step of annealing at an annealing temperature of 650 ° C to 720 ° C or less, and the foregoing After the annealing step, a secondary cold rolling step of secondary cold rolling is performed at a rolling ratio of 25% or more and 40% or less.

[3]一種王冠蓋，其係由如上述[1]之王冠蓋用鋼板而成。 [3] A crown cap made of a steel plate for a crown cover as described in [1] above.

[4]一種王冠蓋用鋼板之製造方法，其係具有下述步驟：將具有由以質量%計含有C：0.010%以上0.025%以下、Si：0.10%以下、Mn：0.05%以上0.50%以下、P： 0.050%以下、S：0.005%以上0.050%以下、Al：0.020%以上0.070%以下、N：未滿0.0040%，且剩餘部分為Fe及不可避免的雜質而成之成分組成的鋼胚進行熱軋，並以捲取溫度530℃以上590℃以下進行捲取之熱軋步驟、前述熱軋步驟後，進行冷軋之一次冷軋步驟、前述一次冷軋步驟後，以退火溫度650℃以上720℃以下進行退火之退火步驟、及前述退火步驟後，以壓延率25%以上40%以下進行二次冷軋之二次冷軋步驟；其中該鋼板進行210℃、15分鐘之熱處理後的降伏強度為：壓延方向之降伏強度為550MPa以上，壓延面內之與壓延方向成45°之方向的降伏強度為壓延方向之降伏強度和壓延面內之與壓延方向成90°之方向的降伏強度之平均值以下。 [4] A method for producing a steel sheet for a crown cap, comprising the step of containing C: 0.010% or more and 0.025% or less, Si: 0.10% or less, and Mn: 0.05% or more and 0.50% or less by mass%. , P: Steel preforms having a composition of 0.050% or less, S: 0.005% or more and 0.050% or less, Al: 0.020% or more and 0.070% or less, N: less than 0.0040%, and the remainder being Fe and unavoidable impurities are hot rolled. And after the hot rolling step of winding up at a coiling temperature of 530 ° C or more and 590 ° C or less, and the hot rolling step, after performing the cold rolling step and the primary cold rolling step, the annealing temperature is 650 ° C or higher and 720 ° C. After the annealing step and the annealing step, the second cold rolling step of the second cold rolling is performed at a rolling ratio of 25% or more and 40% or less; wherein the steel sheet is subjected to a heat treatment at 210 ° C for 15 minutes. The lodging strength in the rolling direction is 550 MPa or more, and the lodging strength in the direction of the rolling surface in the direction of 45° in the rolling direction is the average of the lodging strength in the rolling direction and the fluctuation strength in the direction of the rolling surface in the direction of 90° from the rolling direction. the following.

依據本發明，可得到即使薄化使用亦具備充分之強度與成形性的王冠蓋用鋼板。使兼具鋼板之強度與王冠蓋成形性變得可能，可實現王冠蓋之薄化。 According to the present invention, it is possible to obtain a steel sheet for a crown cap which has sufficient strength and formability even when used thin. It is possible to make both the strength of the steel sheet and the crown cap formability, and the thinning of the crown cap can be achieved.

以下，詳細說明本發明。另外，以下之%若無特別限定則為質量%的意思。 Hereinafter, the present invention will be described in detail. In addition, the following % is a mass % unless it is not specifically limited.

本發明之鋼板具有特定之成分組成，關於其210℃、15分鐘之熱處理後的降伏強度：壓延方向之降伏強度為550MPa以上，壓延面內之與壓延方向成45°之方 向的降伏強度為壓延方向之降伏強度和壓延面內之與壓延方向成90°之方向的降伏強度之平均值以下。其結果，得到具備充分之強度與成形性，可薄化使用的王冠蓋。 The steel sheet of the present invention has a specific composition, and the relief strength after heat treatment at 210 ° C for 15 minutes: the relief strength in the rolling direction is 550 MPa or more, and the inside of the rolling surface is 45° from the rolling direction. The downward strength of the direction is equal to or less than the average of the lodging strength in the rolling direction and the fluctuation strength in the direction of the rolling surface in the direction of 90° from the rolling direction. As a result, a crown cap having sufficient strength and formability and being thinned can be obtained.

成分組成 Composition

說明本發明之成分組成。 The composition of the components of the present invention will be described.

C：0.010%以上0.025%以下 C: 0.010% or more and 0.025% or less

C藉由將含量規定在最適範圍，為賦予強度與加工性兼具的元素。C含量若未滿0.010%，則固溶C之強化量小，成為強度不足。另一方面，C含量若超過0.025%，則已成形之王冠蓋的皺褶形狀變得不均勻，成為形狀不良。因此，C含量定為0.010%以上0.025%以下。 C is an element that combines strength and workability by setting the content to an optimum range. When the C content is less than 0.010%, the amount of strengthening of the solid solution C is small, and the strength is insufficient. On the other hand, when the C content exceeds 0.025%, the wrinkle shape of the formed crown cap becomes uneven, resulting in a shape defect. Therefore, the C content is set to be 0.010% or more and 0.025% or less.

Si：0.10%以下 Si: 0.10% or less

由於Si含量若過量則對於成形性有壞影響，故不宜含有超過0.10%。因此，Si含量定為0.10%以下。由鋼板的強度提升之點來看，較佳為0.02%以上0.10%以下。 If the Si content is excessive, the moldability is adversely affected, so it is not preferable to contain more than 0.10%. Therefore, the Si content is set to be 0.10% or less. From the viewpoint of the strength of the steel sheet, it is preferably 0.02% or more and 0.10% or less.

Mn：0.05%以上0.50%以下 Mn: 0.05% or more and 0.50% or less

Mn含量若低於0.05%，即使使S含量降低亦難以迴避熱脆性，連續鑄造時發生表面破裂等之問題。另一方面，Mn亦與Si相同，若含有超過0.50%對於成形性有壞影響。因此，Mn含量定為0.05%以上0.50%以下。 When the Mn content is less than 0.05%, it is difficult to avoid hot brittleness even if the S content is lowered, and problems such as surface cracking occur during continuous casting. On the other hand, Mn is also the same as Si, and if it contains more than 0.50%, it has a bad influence on formability. Therefore, the Mn content is set to be 0.05% or more and 0.50% or less.

P：0.050%以下 P: 0.050% or less

P含量若超過0.050%，則引起鋼的硬質化或耐蝕性的降低。因此，P含量定為0.050%以下。 When the P content exceeds 0.050%, the steel is hardened or the corrosion resistance is lowered. Therefore, the P content is set to be 0.050% or less.

S：0.005%以上0.050%以下 S: 0.005% or more and 0.050% or less

S在鋼中與Mn結合形成MnS，藉由大量地析出使鋼的熱延展性降低。S之含量若超過0.050%則此影響變得顯著。另一方面，S含量若未滿0.005%時則脫硫成本變得過大。因此，S含量定為0.005%以上0.050%以下。 S combines with Mn to form MnS in the steel, and the hot ductility of the steel is lowered by precipitation in a large amount. If the content of S exceeds 0.050%, the effect becomes remarkable. On the other hand, if the S content is less than 0.005%, the desulfurization cost becomes excessive. Therefore, the S content is set to be 0.005% or more and 0.050% or less.

Al：0.020%以上0.070%以下 Al: 0.020% or more and 0.070% or less

Al為作為脫氧劑所添加之元素。又，與鋼中的N形成AlN，使鋼中之固溶N減少。Al含量若未滿0.020%則作為脫氧劑的效果不充分，招致凝固缺陷的產生。另一方面，二次冷軋大時，大量之Al成為成形性降低的要因。Al含量若超過0.070%則王冠蓋成形時皺褶的形狀變得不均勻，引起形狀不良。因此，Al含量定為0.020%以上0.070%以下。 Al is an element added as a deoxidizer. Further, AlN is formed with N in the steel to reduce the solid solution N in the steel. If the Al content is less than 0.020%, the effect as a deoxidizing agent is insufficient, and coagulation defects are caused. On the other hand, when secondary cold rolling is large, a large amount of Al is a cause of deterioration in formability. When the Al content exceeds 0.070%, the shape of the wrinkles at the time of molding the crown cap becomes uneven, resulting in a shape defect. Therefore, the Al content is set to be 0.020% or more and 0.070% or less.

N：未滿0.0040% N: less than 0.0040%

N之含量若為0.0040%以上則鋼板硬質化，使成形性惡化。引此，N之含量定為未滿0.0040%。較佳為0.0035%以下。 When the content of N is 0.0040% or more, the steel sheet is hardened to deteriorate the formability. Therefore, the content of N is set to be less than 0.0040%. It is preferably 0.0035% or less.

上述必須成分以外的剩餘部分為鐵及不可避免的雜質。 The remainder other than the above-mentioned essential components are iron and unavoidable impurities.

力學性質 Mechanical properties

接下來，說明本發明之王冠蓋用鋼板的力學性質。 Next, the mechanical properties of the steel sheet for the crown cap of the present invention will be described.

王冠蓋用鋼板追求相對於瓶的內壓王冠蓋不脫離的強度。因應於此，以往所使用的王冠蓋用鋼板的板厚為0.20mm以上。然而，薄化的要求增加，對於板厚低於0.20mm的薄化需要較以往更大的強度。鋼板之壓延方向之降伏強度未滿550MPa時，不可能賦予如上述般薄化之王冠蓋充分的強度，耐壓強度不足。因此，壓延方向之降伏強度定為550MPa以上。 The crown cap uses a steel plate to pursue the strength of the crown cap relative to the inner pressure of the bottle. In response to this, the steel plate for the crown cap used in the past has a plate thickness of 0.20 mm or more. However, the demand for thinning has increased, and the thinning of a plate thickness of less than 0.20 mm requires greater strength than before. When the falling strength of the rolling direction of the steel sheet is less than 550 MPa, it is impossible to impart sufficient strength to the crown cap which is thinned as described above, and the pressure resistance is insufficient. Therefore, the fall strength in the rolling direction is set to be 550 MPa or more.

又，一般而言DR鋼板中，隨著壓延面內之方向降伏強度產生差異。與壓延方向成45°之方向的降伏強度若超過壓延方向之降伏強度和與壓延方向成90°之方向的降伏強度的平均值，則成形性降低。因此，本發明中，壓延面內之與壓延方向成45°之方向的降伏強度定為壓延方向之降伏強度和壓延面內之與壓延方向成90°之方向的降伏強度之平均值以下。即，將壓延方向之降伏強度和壓延面內之與壓延方向成90°之方向的降伏強度之平均值，減去壓延面內之與壓延方向成45°之方向的降伏強度的差定為0MPa以上。較佳為10MPa以上25MPa以下。 Further, in general, in the DR steel sheet, a difference occurs in the direction of the fall in the direction of the rolling surface. When the fall strength in the direction of 45° with respect to the rolling direction exceeds the average value of the fall strength in the rolling direction and the fall strength in the direction of 90° in the rolling direction, the formability is lowered. Therefore, in the present invention, the lodging strength in the direction of the rolling direction in the direction of the rolling direction is set to be equal to or less than the average value of the lodging strength in the rolling direction and the fluctuation strength in the direction of the rolling surface in the direction of 90° from the rolling direction. That is, the difference between the fall strength in the rolling direction and the fall strength in the direction perpendicular to the rolling direction in the rolling plane, and the difference in the drop strength in the direction of the rolling surface in the direction of 45° from the rolling direction is 0 MPa. the above. It is preferably 10 MPa or more and 25 MPa or less.

另外，依據後述之製造方法可製造如上述之降伏強度的鋼板。 Further, a steel sheet having a relief strength as described above can be produced according to the manufacturing method described later.

又，因使王冠蓋成形時，於鋼板進行烘烤塗裝而成形者為多，故必須評估進行相當於於塗裝烘烤之處理後的材質。因此，本發明中，各降伏強度為於210℃、15分鐘之相當於塗裝烘烤之熱處理後進行測定，可適用「JIS Z 2241」所示之金屬材料拉伸試驗方法。 Moreover, since the shape of the crown plate is formed by bake coating on the steel sheet, it is necessary to evaluate the material after the treatment corresponding to the coating baking. Therefore, in the present invention, each of the lodging strengths is measured after heat treatment corresponding to coating baking at 210 ° C for 15 minutes, and the metal material tensile test method shown by "JIS Z 2241" can be applied.

王冠蓋用鋼板之製造方法 Manufacturing method of steel plate for crown cap

以下，說明本發明之王冠蓋用鋼板之製造方法的一例。 Hereinafter, an example of a method for producing a steel sheet for a crown cap according to the present invention will be described.

本發明之王冠蓋用鋼板之製造方法具有下述步驟：將具有上述成分組成之鋼胚進行熱軋，並以捲取溫度530℃以上590℃以下進行捲取之熱軋步驟、前述熱軋步驟後，進行冷軋之一次冷軋步驟、前述一次冷軋步驟後，以退火溫度650℃以上720℃以下進行退火之退火步驟、及前述退火步驟後，進行壓延率25%以上40%以下之二次冷軋之二次冷軋步驟。以下說明各步驟。 The method for producing a steel sheet for a crown cap according to the present invention has the following steps: a hot rolling step of hot-rolling a steel slab having the above-described composition and winding at a coiling temperature of 530 ° C or more and 590 ° C or less, and the hot rolling step After the cold rolling step and the primary cold rolling step, the annealing step of annealing at an annealing temperature of 650 ° C to 720 ° C or less and the annealing step are performed, and then a rolling ratio of 25% or more and 40% or less is performed. The second cold rolling step of the secondary cold rolling. The steps are explained below.

熱軋步驟 Hot rolling step

藉由使用轉爐等之周知的方法，將熔鋼調整成上述之化學成分，藉由連續鑄造法成為鋼胚。然後，鋼胚於熱進行粗壓延。粗壓延的方法雖無限定，但鋼胚之加熱溫度以1200℃以上較佳。接著，進行終軋。終軋溫度由壓延荷重之安定性的觀點來看，以850℃以上較佳。另外，此處所謂終軋溫度，係指放入終軋機之最後機台時的板溫。另一 方面，使終軋溫度提高至必要以上有使薄鋼板之製造變得困難之情形。即，板厚為薄時，壓延中板溫降低大，故保持高板溫來進行終軋變得難以控制。因此，終軋溫度以850℃以上900℃以下較佳。 The molten steel is adjusted to the above-described chemical composition by a well-known method such as a converter, and the steel is formed by a continuous casting method. The steel blank is then subjected to coarse calendering on heat. Although the method of rough rolling is not limited, the heating temperature of the steel preform is preferably 1200 ° C or higher. Next, final rolling is performed. The finishing temperature is preferably 850 ° C or higher from the viewpoint of the stability of the rolling load. In addition, the term "finishing temperature" as used herein refers to the sheet temperature at the time of the last stage of the final rolling mill. another On the other hand, it is difficult to increase the finish rolling temperature to the extent necessary to make the production of the steel sheet difficult. That is, when the thickness of the sheet is thin, the temperature of the sheet during rolling is largely lowered, so that it is difficult to control the finish rolling after maintaining the high sheet temperature. Therefore, the finishing temperature is preferably 850 ° C or more and 900 ° C or less.

熱軋步驟之捲取溫度若未滿530℃，為了不損效率而操作，對應於此必須降低終軋溫度，故不適宜。另一方面，捲取溫度若較590℃高，則捲取後析出之AlN量變得過大，與退火後之細粒化相關之成形性降低。因此，捲取溫度定為530℃以上590℃以下。較佳為540℃以上580℃以下。 If the coiling temperature of the hot rolling step is less than 530 ° C, it is not suitable for the operation without impairing the efficiency, and the final rolling temperature must be lowered accordingly. On the other hand, when the coiling temperature is higher than 590 ° C, the amount of AlN precipitated after coiling becomes excessively large, and the formability associated with fine granulation after annealing is lowered. Therefore, the coiling temperature is set to be 530 ° C or more and 590 ° C or less. It is preferably 540 ° C or more and 580 ° C or less.

一次冷軋步驟 One cold rolling step

一次冷軋步驟之前除去表層銹皮較佳。表層銹皮之除去方法並無特別限定，雖可適用酸洗或物理性除去等各種之常法，但藉由酸洗可適宜地除去。酸洗時的條件亦無特別限定，依照常法酸洗即可。 It is preferred to remove the surface scale before a cold rolling step. The method for removing the surface scale is not particularly limited, and various conventional methods such as pickling or physical removal can be applied, but it can be suitably removed by pickling. The conditions at the time of pickling are also not particularly limited, and it may be pickled by a usual method.

一次冷軋之壓延率，為了製造極薄材料以85%以上較佳。但，壓延率若變得過大，則對壓延機的負荷變得過大，有壓延本身變得困難之情形。因此，壓延率定為94%以下較佳。 The calendering rate of one cold rolling is preferably 85% or more for producing an extremely thin material. However, if the rolling rate is too large, the load on the calender becomes too large, and the rolling itself becomes difficult. Therefore, the rolling ratio is preferably 94% or less.

退火步驟 Annealing step

退火溫度若超過720℃，則連續退火中易發生熱瓢曲(heat buckle)等之通板的麻煩，故不佳。退火溫度若未滿 650℃，則再結晶變得不完全，材質變得不均勻。因此，退火溫度定為650℃以上720℃以下。另外，退火步驟之均熱時間雖無特別限定，但為了確實地得到再結晶組織以10秒以上較佳，為了防止過大之粒成長而以50秒以下較佳。 When the annealing temperature exceeds 720 ° C, troubles such as heat-buckling are likely to occur during continuous annealing, which is not preferable. If the annealing temperature is not full At 650 ° C, recrystallization becomes incomplete and the material becomes uneven. Therefore, the annealing temperature is set to be 650 ° C or more and 720 ° C or less. Further, although the soaking time of the annealing step is not particularly limited, it is preferably 10 seconds or more in order to obtain a recrystallized structure reliably, and it is preferably 50 seconds or less in order to prevent excessive grain growth.

二次冷軋(DR壓延)步驟 Secondary cold rolling (DR calendering) step

退火後之鋼板藉由二次冷軋而高強度化。二次冷軋之壓延率若未滿25%，則不能得到確保王冠蓋之耐壓性的充分強度。又，二次冷軋之壓延率若超過40%，則壓延面內之與壓延方向成45°之方向的降伏強度與壓延方向之降伏強度和壓延面內之與壓延方向成90°之方向的降伏強度之平均值的差往正變大，有損成形性。因此，二次冷軋之壓延率定為25%以上40%。 The annealed steel sheet is increased in strength by secondary cold rolling. If the rolling ratio of the secondary cold rolling is less than 25%, sufficient strength for ensuring the pressure resistance of the crown cap cannot be obtained. Further, if the rolling ratio of the secondary cold rolling exceeds 40%, the lodging strength in the direction of the rolling direction in the direction of the rolling direction and the rolling strength in the rolling direction and the direction in the rolling surface in the direction of the rolling direction are 90°. The difference in the average value of the lodging strength is gradually increased, which impairs the formability. Therefore, the rolling rate of the secondary cold rolling is set to be 25% or more and 40%.

藉由上述，得到本發明之高強度鋼板。此處所得之鋼板即使施以鍍敷或化學合成處理等之表面處理亦不會損及發明效果。 From the above, the high-strength steel sheet of the present invention is obtained. The steel sheet obtained here does not impair the effects of the invention even if it is subjected to surface treatment such as plating or chemical synthesis treatment.

[實施例] [Examples]

將由具有表1所示成分組成，剩餘部分為Fe及不可避免的雜質而成之鋼以轉爐熔製，藉由連續鑄造得到鋼胚。所得鋼胚加熱至1250℃後，以壓延開始溫度1150℃、終軋溫度860℃進行熱軋，以表2所示捲取溫度進行捲取。接著，以酸洗除去銹皮後，以表2所示一次冷 軋率進行一次冷軋，使用連續退火爐以表2所示退火溫度進行退火，以表2所示二次冷軋率進行二次冷軋(DR壓延)，得到板厚0.15~0.18mm之鋼板(水準1~9)。於所得鋼板之兩面之每一面施以100mg/m2之Cr鍍敷，得到無錫鋼。 The steel which is composed of the components shown in Table 1 and the remainder which is Fe and unavoidable impurities is melted in a converter, and the steel is obtained by continuous casting. The obtained steel slab was heated to 1,250 ° C, and hot rolled at a rolling start temperature of 1,150 ° C and a final rolling temperature of 860 ° C, and coiled at the coiling temperature shown in Table 2. Next, after removing the scale by pickling, the cold rolling was performed once at the primary cold rolling rate shown in Table 2, and annealing was performed at the annealing temperature shown in Table 2 using a continuous annealing furnace, and the secondary cold rolling rate shown in Table 2 was carried out. Secondary cold rolling (DR rolling) to obtain a steel plate with a thickness of 0.15 to 0.18 mm (level 1 to 9). Cr plating of 100 mg/m 2 was applied to each of both sides of the obtained steel sheet to obtain tin-free steel.

對於藉由上述所得之鋼板以下述方法進行特性評估。 The characteristics of the steel sheets obtained by the above were evaluated by the following methods.

降伏強度 Falling strength

進行210℃、15分鐘之相當於塗裝烘烤的的熱處理後，進行拉伸試驗。拉伸試驗使用JIS5號尺寸之拉伸試驗片，依循「JIS Z2241」進行，測定壓延方向之降伏強度、壓延面內之與壓延方向成45°之方向的降伏強度、壓延面內之與壓延方向成90°之方向的降伏強度。 After the heat treatment corresponding to the coating baking at 210 ° C for 15 minutes, a tensile test was performed. The tensile test was carried out using a JIS No. 5 tensile test piece according to JIS Z2241, and the drop strength in the rolling direction, the fall strength in the direction of the rolling direction in the rolling direction of 45°, and the rolling direction in the rolling surface were measured. The strength of the fall in the direction of 90°.

王冠蓋成形性 Crown cap formability

使用所得之鋼板成形王冠蓋，評估王冠蓋成形性。使用直徑37mm之圓形胚料，藉由加壓加工成形成「JIS S 9017」(廢除的規格)所記載之3種王冠蓋的尺寸(外徑32.1mm、高6.5mm、皺褶數21)。以目視進行評估，皺褶大小全部一致時評估為◎、皺褶大小幾乎一致時評估為○、皺褶大小不一致時評估為×。另外，上述目視判定中，皺褶之寬(擴展)之最大值為最小值的1.5倍以上時判斷為不一致。 The crown of the crown cap was evaluated using the obtained steel plate to form a crown cap. The size of the three kinds of crown caps (32.1 mm in outer diameter, 6.5 mm in height, and 21 in wrinkles) described in "JIS S 9017" (removed specifications) was formed by using a round blank having a diameter of 37 mm. . It was evaluated by visual observation, and when the wrinkle size was all the same, it was evaluated as ◎, when the wrinkle size was almost the same, it was evaluated as ○, and when the wrinkle size was inconsistent, it was evaluated as ×. Further, in the above-described visual determination, it is determined that the maximum value of the width (expansion) of the wrinkles is 1.5 times or more of the minimum value.

使用已成形之王冠蓋的耐壓試驗 Pressure test using a formed crown cap

藉由與上述相同的方法成形王冠蓋。接著，於王冠蓋之內側成形氯化乙烯製襯墊，封蓋於市售啤酒瓶使用Glassline Corporation製Secure Seal Tester測定王冠蓋脫離之內壓。 The crown cap is formed by the same method as described above. Next, a vinyl chloride gasket was formed on the inside of the crown cap, and the commercial beer bottle was capped and the internal pressure of the crown cap was measured using a Secure Seal Tester manufactured by Glassline Corporation.

顯示與以往之王冠蓋同等以上之耐壓強度時評估為○，無法達到以往之王冠蓋的耐壓強度時評估為×。 When the pressure resistance strength equal to or higher than that of the conventional crown cap is displayed, it is evaluated as ○, and when the pressure resistance of the conventional crown cap cannot be obtained, it is evaluated as ×.

以上所得之結果表示於表3。 The results obtained above are shown in Table 3.

依據表3，本發明例之水準1~6的鋼板，壓延方向之降伏強度為550MPa，且壓延面內之與壓延方向成45°之方向的降伏強度為壓延方向之降伏強度和壓延面內 之與壓延方向成90°之方向的降伏強度之平均值以下，王冠蓋成形性及耐壓強度皆為良好。 According to Table 3, the steel sheet of the level 1 to 6 of the example of the present invention has a relief strength of 550 MPa in the rolling direction, and the lodging strength in the direction of the rolling direction in the direction of the rolling direction is 45° in the rolling direction and the rolling surface in the rolling direction. The average value of the relief strength in the direction of 90° from the rolling direction is good, and the crown cap formability and the pressure resistance are both good.

另一方面，比較例之水準7的鋼板因C含量過少，壓延方向之降伏強度為未滿550MPa，耐壓強度不足。比較例之水準8的鋼板因退火溫度過低，與壓延方向成45°之方向的降伏強度超過壓延方向之降伏強度和壓延面內之與壓延方向成90°之方向的降伏強度之平均值，王冠蓋成形性差。因為王冠蓋之形狀不良故密封性不足，耐壓強度亦變小。比較例之水準9的鋼板因為二次冷軋率過小，壓延方向之降伏強度為未滿550MPa，王冠蓋成形性差，耐壓強度不足。 On the other hand, in the steel sheet of the level 7 of the comparative example, the C content was too small, and the lodging strength in the rolling direction was less than 550 MPa, and the pressure resistance was insufficient. In the steel sheet of the level 8 of the comparative example, the annealing strength is too low, and the falling strength in the direction of 45° from the rolling direction exceeds the falling strength of the rolling direction and the average of the falling strength in the direction of the rolling surface in the direction of 90° from the rolling direction. The crown cap is poorly formed. Because the shape of the crown cap is poor, the sealing is insufficient and the compressive strength is also small. In the steel sheet of the level 9 of the comparative example, since the secondary cold rolling rate is too small, the rolling strength in the rolling direction is less than 550 MPa, the crown cap formability is poor, and the pressure resistance is insufficient.

Claims (4)

一種王冠蓋用鋼板，其具有由以質量%計含有C：0.010%以上0.025%以下、Si：0.10%以下、Mn：0.05%以上0.50%以下、P：0.050%以下、S：0.005%以上0.050%以下、Al：0.020%以上0.070%以下、N：未滿0.0040%，且剩餘部分為Fe及不可避免的雜質而成之成分組成，其進行210℃、15分鐘之熱處理後的降伏強度為：壓延方向之降伏強度為550MPa以上，且壓延面內之與壓延方向成45°之方向的降伏強度為壓延方向之降伏強度和壓延面內之與壓延方向成90°之方向的降伏強度之平均值以下。 A steel sheet for a crown cap comprising C: 0.010% or more and 0.025% or less, Si: 0.10% or less, Mn: 0.05% or more and 0.50% or less, P: 0.050% or less, and S: 0.005% or more and 0.050% by mass%. % or less, Al: 0.020% or more and 0.070% or less, N: less than 0.0040%, and the remainder is a component composition of Fe and unavoidable impurities, and the lodging strength after heat treatment at 210 ° C for 15 minutes is: The lodging strength in the rolling direction is 550 MPa or more, and the lodging strength in the direction of the rolling surface in the direction of 45° in the rolling direction is the average of the lodging strength in the rolling direction and the fluctuation strength in the direction of the rolling surface in the direction of 90° from the rolling direction. the following. 一種王冠蓋用鋼板之製造方法，其係製造如請求項1之王冠蓋用鋼板之方法，其具有下述步驟：將鋼胚進行熱軋，並以捲取溫度530℃以上590℃以下進行捲取之熱軋步驟、前述熱軋步驟後，進行冷軋之一次冷軋步驟、前述一次冷軋步驟後，以退火溫度650℃以上720℃以下進行退火之退火步驟、及前述退火步驟後，以壓延率25%以上40%以下進行二次冷軋之二次冷軋步驟。 A method for producing a steel sheet for a crown cap, which is a method for producing a steel sheet for a crown cap according to claim 1, which has the following steps: hot rolling a steel preform and rolling at a coiling temperature of 530 ° C or more and 590 ° C or less After the hot rolling step and the hot rolling step, after the cold rolling step and the primary cold rolling step, the annealing step of annealing at an annealing temperature of 650 ° C to 720 ° C or less and the annealing step are performed. The second cold rolling step of secondary cold rolling is performed at a rolling ratio of 25% or more and 40% or less. 一種王冠蓋，其係由如請求項1之王冠蓋用鋼板而成。 A crown cap made of a steel plate as claimed in claim 1 of the crown. 一種王冠蓋用鋼板之製造方法，其係具有下述步驟： 將具有由以質量%計含有C：0.010%以上0.025%以下、Si：0.10%以下、Mn：0.05%以上0.50%以下、P：0.050%以下、S：0.005%以上0.050%以下、Al：0.020%以上0.070%以下、N：未滿0.0040%，且剩餘部分為Fe及不可避免的雜質而成之成分組成的鋼胚進行熱軋，並以捲取溫度530℃以上590℃以下進行捲取之熱軋步驟、前述熱軋步驟後，進行冷軋之一次冷軋步驟、前述一次冷軋步驟後，以退火溫度650℃以上720℃以下進行退火之退火步驟、及前述退火步驟後，以壓延率25%以上40%以下進行二次冷軋之二次冷軋步驟；其中該鋼板進行210℃、15分鐘之熱處理後的降伏強度為：壓延方向之降伏強度為550MPa以上，且壓延面內之與壓延方向成45°之方向的降伏強度為壓延方向之降伏強度和壓延面內之與壓延方向成90°之方向的降伏強度之平均值以下。 A method for manufacturing a steel sheet for a crown cap, which has the following steps: It is contained in a mass% of C: 0.010% or more and 0.025% or less, Si: 0.10% or less, Mn: 0.05% or more and 0.50% or less, P: 0.050% or less, S: 0.005% or more and 0.050% or less, and Al: 0.020. Steel embryos having a composition of less than 0.070% or less, N: less than 0.0040%, and the remainder being Fe and unavoidable impurities are hot-rolled, and coiled at a coiling temperature of 530 ° C or more and 590 ° C or less. After the hot rolling step and the hot rolling step, after the cold rolling step and the primary cold rolling step, the annealing step is performed at an annealing temperature of 650 ° C or more and 720 ° C or less, and after the annealing step, the rolling ratio is performed. 25% or more and 40% or less is subjected to a secondary cold rolling step of secondary cold rolling; wherein the steel sheet is subjected to a heat treatment at 210 ° C for 15 minutes, and the strength of the fall after the heat treatment is 550 MPa or more in the rolling direction, and the inside of the rolled surface The lodging strength in the direction in which the rolling direction is 45° is equal to or less than the average of the lodging strength in the rolling direction and the fluctuation strength in the direction of the rolling surface in the direction of 90° from the rolling direction.
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