TWI473889B - 高強度高加工性鋼板及其製造方法 - Google Patents
高強度高加工性鋼板及其製造方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims description 110
- 239000010959 steel Substances 0.000 title claims description 110
- 238000004519 manufacturing process Methods 0.000 title claims description 10
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- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
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- QJNYIFMVIUOUSU-UHFFFAOYSA-N chloroethene;ethenyl acetate;furan-2,5-dione Chemical compound ClC=C.CC(=O)OC=C.O=C1OC(=O)C=C1 QJNYIFMVIUOUSU-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
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- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
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- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
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- 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
- B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
- B65D25/14—Linings or internal coatings
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- C—CHEMISTRY; METALLURGY
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
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- 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
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- 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
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- 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
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- 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
- C21D8/0268—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment between cold rolling steps
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- 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
- C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
- C21D8/0284—Application of a separating or insulating coating
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- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
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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
- C22C38/001—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
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
- C25D7/0614—Strips or foils
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/10—Metallic substrate based on Fe
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2701/00—Coatings being able to withstand changes in the shape of the substrate or to withstand welding
- B05D2701/10—Coatings being able to withstand changes in the shape of the substrate or to withstand welding withstanding draw and redraw process, punching
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
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- 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
- C21D2251/00—Treating composite or clad material
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31678—Of metal
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- Chemical & Material Sciences (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Laminated Bodies (AREA)
Description
本發明是關於適用於易開蓋(Easy Open End)用鋼板的高強度高加工性鋼板及其製造方法。
在飲料罐或罐頭所用的鋼板之中,在蓋部或底部、三件式罐的體部、拉伸罐等,有時使用稱為DR(Double Reduce)(二次冷軋)材的鋼板。藉由在退火後再次進行冷軋的DR法所製造的DR材,相較於在退火後藉由軋製率較小的調質軋製(temper rolling)所製造的SR(Single Reduce)(一次冷軋)材,更容易將板厚度變薄。因此藉由使用DR材,可以減低製罐成本。另一方面,藉由DR法,由於是藉由在退火後再次進行冷軋而產生加工硬化,雖然能製造較薄且較硬的鋼板,可是相反相較於SR材其加工性較差。
做為飲料罐或罐頭的蓋子,廣泛使用容易開罐的EOE(易開蓋(Easy Open End))。當製造EOE時,
需要藉由撐壓加工將用來安裝勾掛手指的翼片的鉚釘成形。另一方面,作為製罐材料的鋼板需要因應板厚度的強度,如果是DR材,為了確保作薄的經濟效率而需要約520MPa以上的拉伸強度。在習知的DR材,很難同時達到如上述的加工性與強度,所以在EOE使用SR材。可是現在根據減低成本的觀點,對於EOE使用DR材的要求也變高。
根據該背景,在專利文獻1揭示一種鉚釘成形性優異的易開蓋的罐蓋用鋼板及其製造方法,該易開蓋的碳的含有量為0.02%以下,硼的含有量為0.010~0.020%的範圍內;該製造方法是以下壓率30%以下進行二次冷軋。在專利文獻2揭示有一種DR材,時效處理後的平均蘭克福特值(Lankford Value)為1.0以下,該DR材對EOE的鉚釘成形性很優異。
[專利文獻1]日本特許第3740779號公報
[專利文獻2]國際公開第2008/018531號
可是在上述習知技術都具有問題。也就是說,雖然適用的罐蓋的直徑越大則鋼板需要越大的強度,
而在專利文獻1記載的鋼板,碳的含有量較少,要得到較大的強度的話需要增加氮的含量。可是由於該鋼板含有一定量以上的硼,所以氮的含有量變大的話讓高溫延展性降低,連續鑄造時會產生扁鋼胚裂紋。因此專利文獻1記載的鋼板無法適用於大直徑的EOE。
另一方面,在專利文獻2記載的鋼板,藉由減少平均蘭克福特值(Lankford Value)來達到良好的鉚釘成形性。可是該方法發揮效果只有在藉由接近圓柱狀的撐壓加工來成形鉚釘的情況,在藉由接近球狀的撐壓加工來成形鉚釘的情況,鉚釘成形性變得不夠。因此希望提供一種高強度高加工性鋼板,拉伸強度為520MPa以上且依氏值(Erichsen Value)為5.0mm以上。
本發明鑑於上述課題要提供一種高強度高加工性鋼板及其製造方法,可得到拉伸強度為520MPa以上且依氏值(Erichsen Value)為5.0mm以上的高強度高加工性鋼板。
本發明的發明者們仔細研究的結果,發現為了同時達到鋼板的加工性與強度,將碳的含有量限制在適當的範圍防止加工性降低,藉由增加氮的含量來確保強度,並且將退火後的二次冷軋率限制在適當的範圍的方式很有效。本發明的發明者們發現,熱軋後的捲繞溫度較高的話,析出的滲碳體會變得粗大,局部延伸會降低,所以
需要將捲繞溫度也限制在適當的溫度範圍。並且本發明的發明者們發現,藉由將適當厚度的樹脂薄膜層設置在成為罐內面之側,則讓撐壓加工導致的鉚釘成形性特別提升。
本發明的高強度高加工性鋼板,其鋼板質量%,含有:C:大於0.020%小於0.040%、Si:0.003%以上0.100%以下、Mn:0.10%以上0.60%以下、P:0.001%以上0.100%以下、S:0.001%以上0.020%以下、Al:0.005%以上0.100%以下、N:大於0.0130%且0.0170%以下,剩餘部分由Fe及不可避免的雜質所構成;至少在成為罐內面之側具有樹脂薄膜層,軋製方向的拉伸強度為520MPa以上,依氏值(Erichsen Value)為5.0mm以上。
樹脂薄膜層的厚度為5~100μm的範圍內。
本發明的高強度高加工性鋼板的製造方法,將質量%,含有:C:大於0.020%小於0.040%、Si:0.003%以上0.100%以下、Mn:0.10%以上0.60%以下、P:0.001%以上0.100%以下、S:0.001%以上0.020%以下、Al:0.005%以上0.100%以下、N:大於0.0130%且0.0170%以下,剩餘部分由Fe及不可避免的雜質所構成之鋼,藉由連續鑄造作成扁鋼胚,將扁鋼胚再加熱溫度設為1150℃以上進行熱軋,以600℃以下的溫度捲繞,接著進行一次冷軋,然後以均熱溫度600~700℃、均熱時間10~50秒進行連續退火,接著以8.0~15.0%的軋製率進行二次冷軋,在藉由電解法形成表面處理皮膜之後至少在成為罐內面之側貼上樹脂薄膜,製造出軋製方向的拉伸強度
為520MPa以上,依氏值(Erichsen Value)為5.0mm以上的鋼板。
藉由本發明的高強度高加工性鋼板及其製造方法,可得到拉伸強度為520MPa以上,依氏值(Erichsen Value)為5.0mm以上的高強度高加工性鋼板。結果,當EOE的鉚釘成形時不會產生裂紋,能以板厚度較薄的DR材製蓋,可達成EOE用鋼板的大幅薄片化。
以下詳細說明本發明。
本發明的高強度高加工性鋼板,可適用於拉伸強度為520MPa以上,依氏值(Erichsen Value)為5.0mm以上的易開蓋(Easy Open End)用鋼板。該鋼板,使用含有小於0.040%的碳的鋼,將熱軋後的捲繞溫度及二次冷軋率設定為適當的條件,並且藉由在成為罐內面之側貼上樹脂薄膜而可製造。以下針對本發明的高強度高加工性鋼板的成分組成來說明。
本發明的高強度高加工性鋼板,藉由將C(碳)的含
有量抑制得較低來發揮高加工性。C的含有量為0.040%以上的話,鋼板會變得過於硬質,而無法在確保加工性的狀態以二次冷軋製造薄鋼板。因此C的含有量的上限為小於0.040%。另一方面,C的含有量為0.020%以下的話,則無法得到用來獲得鋼板薄片化的顯著經濟效果所需要的拉伸強度520MPa。因此C的含有量的下限為大於0.020%。
Si(矽)的含有量超過0.100%的話,會引起表面處理性降低、耐蝕性惡化等的問題。因此Si的含有量的上限為0.100%。另一方面,Si的含有量小於0.003%則精煉成本會過大。因此Si的含有量的下限為0.003%。Si的含有量較佳為0.003%以上0.035%以下的範圍內。
Mn(錳)是用來防止S(硫)導致熱軋中的紅熱脆性,具有使結晶粒細微化的作用,是確保材質所需要的元素。為了發揮該效果,需要添加至少0.10%以上的Mn。另一方面,將Mn添加過量的話,耐蝕性會惡化,鋼板會過度硬質化。因此Mn的含有量的上限為0.60%。Mn的含有量較佳為0.19%以上0.60%以下的範圍內。
P(磷)是使鋼硬質化,使加工性惡化並且使耐蝕性
也惡化的有害的元素。因此P的含有量的上限為0.100%。另一方面,P的含有量小於0.001%則脫磷成本會過大。因此P的含有量的下限為0.001%。P的含有量較佳為0.001%以上0.015%以下的範圍內。
S是在鋼中作為夾雜物存在,是使加工性惡化並且使耐蝕性惡化的有害的元素。因此S的含有量的上限為0.020%。另一方面,S的含有量小於0.001%則脫硫成本會過大。因此S的含有量的下限為0.001%。S的含有量較佳為0.007%以上0.014%以下的範圍內。
Al(鋁)是製鋼時作為脫氧材所需要的元素。Al的含有量較少的話,脫氧不充分,夾雜物會增加,讓加工性惡化。Al的含有量只要在0.005%以上的話則能充分進行脫氧。另一方面,Al的含有量大於0.100%的話,因氧化鋁叢集等導致表面缺陷的產生頻率增加。因此Al的含有量為0.005%以上0.100%以下。
本發明的高強度高加工性鋼板,取代C的含有量較低讓N(氮)的含有量較高,來確保強度。N所進行的強化對撐壓加工性的影響較小,而無損依氏值(Erichsen
Value)可將鋼板高強度化。N的含有量為0.0130%以下的話,則無法得到罐蓋所需要的強度。另一方面如果添加大量N的話,熱軋性會惡化,在連續鑄造會產生扁鋼胚的裂紋。因此N的含有量的上限為0.0170%。
上述成分以外的剩餘部分為Fe(鐵)及不可避免的雜質,而也可含有在習知的焊接罐用鋼板中一般含有的成分元素。例如因應目的含有:Cr(鉻):0.10%以下、Cu(銅):0.20%以下、Ni(鎳):0.15%以下、Mo(鉬):0.05%以下、Ti(鈦):0.3%以下、Nb(鈮):0.3%以下、Zr(鋯):0.3%以下、V(釩):0.3%以下、Ca(鈣):0.01%以下等的成分元素。
以下針對本發明的高強度高加工性鋼板的機械性質來說明。
本發明的高強度高加工性鋼板的拉伸強度為520MPa以上。拉伸強度小於520MPa的話,則無法將鋼板作薄成為了確保作為製蓋材料的鋼板的強度而得到顯著經濟效果的程度。因此讓拉伸強度為520MPa以上。上述拉伸強度為藉由文獻「JIS Z 2241」所示的金屬材料拉伸試驗方法所測定。
本發明的高強度高加工性鋼板的依氏值
(Erichsen Value)為5.0mm以上。依氏值(Erichsen Value)小於5.0mm的話,在鉚釘成形時會產生裂紋。因此依氏值(Erichsen Value)為5.0mm以上。依氏值(Erichsen Value)為藉由文獻「JIS Z 2247」所示的依氏值(Erichsen Value)試驗方法所測定。當鉚釘成形時,對鋼板施加的加工樣式為撐壓加工,能想成朝與板面平行的全方向的拉伸變形。為了評估鋼板對於該加工的變形能,需要同樣的撐壓加工的試驗,以單純的單軸拉伸試驗的總伸長值或蘭克福特值(Lankford Value)無法評估。
以下針對本發明的高強度高加工性鋼板的表面覆蓋來說明。
鉚釘成形是藉由撐壓加工所進行,在罐外面側實施撐壓加工。因此當加工時,工具接觸罐內面側使鋼板變形。藉由將樹脂薄膜夾在該工具與鋼板之間使其接觸,來提升工具與鋼板之間的潤滑性。藉此能讓撐壓加工的均一性提升,能有效地防止裂紋的產生。將樹脂薄膜不只夾在工具與鋼板之間,將樹脂薄膜覆蓋於鋼板表面的話,也有助於耐蝕性而更適合。
作為樹脂薄膜,並未特別限定,可以使用各種熱可塑性樹脂或熱硬化性樹脂。例如聚乙烯、聚丙烯、乙烯-丙烯共聚合體、乙烯-醋酸乙烯酯共聚合體、乙烯-丙烯酸酯共聚合體、離聚物等的烯烴類樹脂薄膜、或聚對苯
二甲酸丁二酯等的聚酯薄膜、或者尼龍6、尼龍66、尼龍11、尼龍12等的聚醯胺薄膜、聚氯乙烯薄膜、聚偏二氯乙烯薄膜等的熱可塑性樹脂薄膜的未延伸或二軸延伸的材料。
在對鋼板貼上樹脂薄膜時使用黏接劑的情況,適合使用聚氨酯類黏接劑、環氧類黏接劑、酸式變形烯烴樹脂類黏接劑、共聚合聚醯胺類黏接劑、共聚合聚酯類黏接劑(厚度:0.1~5.0μm)等。並且也可在厚度0.05~2.0μm的範圍對鋼板側或樹脂薄膜側塗佈熱硬化性塗料,將其作為黏接劑。並且也可用苯酚環氧、胺-環氧等的變性環氧塗料、氯乙烯-醋酸乙烯酯共聚合體、氯乙烯-醋酸乙烯酯共聚合體皂化物、氯乙烯-醋酸乙烯酯-順丁烯二酸酐共聚合體、環氧變性-、環氧胺變性-、環氧苯酚變性-乙烯塗料或變性乙烯塗料、丙烯酸塗料、苯乙烯-丁二烯類共聚合體等的合成橡膠類塗料等的熱可塑性或熱硬化性塗料的單獨或兩種以上的組合。
樹脂薄膜層的厚度為5~100μm的範圍內。樹脂薄膜的厚度小於5μm的話,撐壓加工時容易斷裂,可能不能發揮充分的效果。樹脂薄膜的厚度超過100μm的話,使鋼板變形量增加的效果變大,容易產生鋼板裂紋。
接著針對本發明的高強度高加工性鋼板的製造方法來說明。
本發明的高強度高加工性鋼板,使用藉由連續鑄造所製造的由上述組成所構成的扁鋼胚,將扁鋼胚再加熱溫度設為1150℃以上進行熱軋,之後以600℃以下的溫度捲繞,接著進行一次冷軋,然後以均熱溫度600~700℃、均熱時間10~50秒進行連續退火,接著以8.0~15.0%的軋製率進行二次冷軋,在藉由電解法形成表面處理皮膜之後至少在成為罐內面之側貼上樹脂薄膜所製造。
通常只有一次冷軋會很難作成得到顯著經濟效果的較薄板厚度。也就是說,為了用一次冷軋得到較薄的板厚度,對軋製機的負荷過大,設備能力不可能。例如要將最終板厚度設為0.15mm的情況,熱軋後的板厚度為2.0mm的話,則需要92.5%這樣大的一次冷軋製率。為了使冷軋後的板厚度減少雖然也考慮在熱軋的階段軋製成較平常更薄,而如果使熱軋的軋製率增大的話,軋製中的鋼板的溫度降低情形變大,而無法得到預定的精加工軋製溫度。並且如果退火前的板厚度減少的話,在實施連續退火的情況,在退火中產生鋼板斷裂或變形等的問題的可能性變大。藉由該理由,在本發明是在退火後實施第二次的冷軋(二次冷軋)而得到極薄的鋼板。
熱軋後的捲繞溫度超過600℃的話,所形成的波來鐵組織會變得粗大,這會成為脆性破壞的起點,而局部延伸性降低而很難得到5.0mm以上的依氏值(Erichsen Value)。因此熱軋後的捲繞溫度為600℃以下較佳,更好在550~600℃的範圍內。
連續退火的均熱溫度小於600℃或均熱時間小於10秒的話,再結晶會不充分,而很難得到5.0mm以上的依氏值(Erichsen Value)。另一方面,如果均熱溫度超過700℃或均熱時間超過50秒的話,再結晶導致的粒成長會過大,而很難得到拉伸強度520MPa。於是連續退火希望以均熱溫度600~700℃、均熱時間10~50秒的條件進行。
二次冷軋製率超過15.0%的話,二次冷軋導致的加工硬化會過大,而很難得到5.0mm以上的依氏值(Erichsen Value)。因此二次冷軋製率為15.0%以下較佳。另一方面,二次冷軋製率小於8.0%的話則很難得到罐蓋所需要的強度。因此二次冷軋製率的下限為8.0%較佳。
在二次冷軋之後,藉由電解法形成表面處理皮膜。作為皮膜,可以適用作為馬口鐵或鍍鉻無錫鋼廣泛用於罐蓋的Sn電解電鍍皮膜、或電解Cr酸處理皮膜等。藉由設置該皮膜,可提高樹脂薄膜與鋼板的緊貼性。
在形成表面處理皮膜後,至少在成為罐內面之側貼上樹脂薄膜。作為貼上的方法,可用將鋼板加熱使樹脂薄膜熱熔接的方法、或使用黏接劑貼上的方法等。
將含有表1所示的成分組成的剩餘部為Fe及不可避免的雜質所構成的鋼以實際轉爐熔製,藉由連續鑄造得到
扁鋼胚。將所得到的扁鋼胚進行再加熱後,以表2所示的條件實施熱軋。熱軋的精加工軋製溫度為880℃,軋製後實施酸洗。接著以軋製率90%進行一次冷軋後,以表2所示的條件實施連續退火及二次冷軋。在以上述所得到的鋼板的兩面連續實施電解Cr酸處理,得到單面Cr附著量100mg/m2
的鍍鉻無錫鋼。並且將共聚合比12mol%的間苯二甲酸共聚合聚對苯二甲酸乙二醇酯薄膜積疊在兩面而得到樹脂覆蓋鋼板。積疊是以一對橡膠輥子夾著加熱至245℃的鋼板與薄膜,將薄膜熔接於金屬板,在通過橡膠輥子1秒以內進行水冷。此時鋼板的進給速度為40m/min,橡膠輥子的夾持長度為17mm。夾持長度為橡膠輥子與鋼板相接的部分的搬運方向的長度。在表1顯示薄膜層的厚度。
對於藉由以上所得到樹脂覆蓋鋼板進行拉伸試驗。拉伸試驗,是依照文獻「JIS Z 2241」所示的金屬材料拉伸試驗方法,使用JIS5號尺寸的拉伸試驗片,來測定拉伸強度。對於所得到樹脂覆蓋鋼板進行依氏值(Erichsen Value)試驗。依氏值(Erichsen Value)試
驗,是依照文獻「JIS Z 2247」所示的依氏值(Erichsen Value)試驗方法,使用90mm×90mm的試驗片來測定依氏值(Erichsen Value)(產生貫穿裂紋的拉伸高度)。使用所得到的樹脂覆蓋鋼板將EOE翼片安裝用鉚釘成形,來評估鉚釘成形性。鉚釘成形藉由三階段的沖壓加工來進行,在撐壓加工之後進行縮徑加工而成形直徑4.0mm,高度2.5mm的球頭狀鉚釘。在鉚釘部產生裂紋的情況評估為×,在到達裂紋之前的階段的厚度方向產生收縮的情況評估為○,未產生裂紋或厚度方向收縮的情況評估為◎。在表3顯示所得到的結果。
如表3所示,發明例的No.1~6的鋼板強度優異,達成作為極薄的罐用鋼板所需要的拉伸強度520MPa以上。而且加工性也優異,具有EOE加工所需要的5.0mm以上的依氏值(Erichsen Value)。即使進行鉚釘成形也不會產生裂紋或厚度方向收縮。相對的,比較例No.7、9的鋼板由於C及N的含有量過少,所以拉伸強度
不夠。比較例8的鋼板,C的含有量太多,所以藉由二次冷軋影響其加工性,依氏值(Erichsen Value)不夠,在鉚釘成形產生裂紋。
比較例的No.10的鋼板其N的含有量太多,所以在連續鑄造產生扁鋼胚裂紋。而比較例No.11的鋼板,由於熱軋後的捲繞溫度太高,所以因為局部延伸性低落而讓依氏值(Erichsen Value)不夠,在鉚釘成形產生裂紋。而比較例No.12的鋼板,由於連續退火的均熱溫度太低所以再結晶不充分,讓依氏值(Erichsen Value)不夠,在鉚釘成形產生裂紋。而比較例No.13的鋼板,由於連續退火的均熱溫度太高所以粒成長過大,拉伸強度不夠。而比較例No.14的鋼板,由於連續退火的均熱時間太短所以再結晶不充分,讓依氏值(Erichsen Value)不夠,在鉚釘成形產生裂紋。
而比較例No.15的鋼板,由於連續退火的均熱時間太長所以粒成長過大,拉伸強度不夠。比較例No.16的鋼板,由於二次冷軋製率太小,所以拉伸強度不夠。而比較例No.17的鋼板,由於二次冷軋製率太大,所以加工硬化過大,讓依氏值(Erichsen Value)不夠,在鉚釘成形產生裂紋。在請求項1、3的發明例且請求項2的比較例的No.18的鋼板,由於覆蓋於鋼板表面的樹脂薄膜的厚度太薄,所以在鉚釘成形無法充分發揮其效果,在到達裂紋之前的階段的厚度方向產生收縮。在請求項1、3的發明例且請求項2的比較例的No.19的鋼板,由於覆
蓋於鋼板表面的樹脂薄膜的厚度太薄,所以在鉚釘成形讓鋼板的變形量增大,在到達裂紋之前的階段的厚度方向產生收縮。
根據上述確認了藉由發明例的鋼板,可得到拉伸強度為520MPa以上,且依氏值(Erichsen Value)為5.0mm以上的高強度高加工性鋼板。
以上藉由針對適用的實施方式說明了本發明者所作的發明,而本發明並不限定於本實施方式的本發明揭示的局部的記載。也就是說,根據本實施方式該業者所進行的其他實施方式、實施例、及運用技術等都包含於本發明的範圍。
藉由本發明可提供一種高強度高加工性鋼板,拉伸強度為520MPa以上且依氏值(Erichsen Value)為5.0mm以上。
Claims (2)
- 一種高強度高加工性鋼板,其特徵為:以鋼板質量%計,含有:C:大於0.020%小於0.040%、Si:0.003%以上0.100%以下、Mn:0.10%以上0.60%以下、P:0.001%以上0.100%以下、S:0.001%以上0.020%以下、Al:0.005%以上0.100%以下、N:大於0.0130%且0.0170%以下,剩餘部分由Fe及不可避免的雜質所構成;至少在成為罐內面之側具有厚度為5~100μm的範圍內的樹脂薄膜層,軋製方向的拉伸強度為520MPa以上,依氏值(Erichsen Value)為5.0mm以上。
- 一種高強度高加工性鋼板的製造方法,其特徵為:將以質量%計,含有:C:大於0.020%小於0.040%、Si:0.003%以上0.100%以下、Mn:0.10%以上0.60%以下、P:0.001%以上0.100%以下、S:0.001%以上0.020%以下、Al:0.005%以上0.100%以下、N:大於0.0130%且0.0170%以下,剩餘部分由Fe及不可避免的雜質所構成之鋼,藉由連續鑄造作成扁鋼胚,將扁鋼胚再加熱溫度設為1150℃以上進行熱軋,以600℃以下的溫度捲繞,接著進行一次冷軋,然後以均熱溫度600~700℃、均熱時間10~50秒進行連續退火,接著以8.0~15.0%的軋製率進行二次冷軋,在藉由電解法形成表面處理皮膜之後至少在成為罐內面之側貼上樹脂薄膜,製造出軋製方向的拉伸強度為520MPa以上,依氏值(Erichsen Value)為5.0mm以 上的鋼板。
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