TW202142701A - Low carbon steel sheet and method of manufacturing the same - Google Patents
Low carbon steel sheet and method of manufacturing the same Download PDFInfo
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本發明係有關於一種低碳鋼片及其製造方法，特別是有關於一種具有低時效與易加工性質的低碳鋼片及其製造方法。The present invention relates to a low-carbon steel sheet and a manufacturing method thereof, in particular to a low-carbon steel sheet with low aging and easy processing properties and a manufacturing method thereof.
低降伏且延伸率良好的鋼材，被廣泛的應用於沖壓成形的用途，例如：馬達外殼、餐飲鍋具、燈具外罩、熱水器外殼、電子配件及汽車板金配件等。鋼材中的碳原子可提升鋼材的強度及控制鋼材的組織。碳原子的體積小移動力高，可自由與材料中的差排結合，而使局部強度提升。然而，隨著時間的經過，鋼材之強度會逐漸增加(時效硬化)，而不易加工，且易導致加工時尺寸精度上的偏差及變形不均，進而產生缺陷。Low-yield and good elongation steels are widely used in stamping and forming applications, such as motor shells, dining pots, lamp housings, water heater shells, electronic accessories and automotive sheet metal accessories. The carbon atoms in the steel can increase the strength of the steel and control the structure of the steel. The small size of carbon atoms has high mobility and can be freely combined with the difference in the material to increase the local strength. However, with the passage of time, the strength of the steel will gradually increase (age hardening), and it is not easy to process, and it is easy to cause deviations in dimensional accuracy and uneven deformation during processing, which will lead to defects.
目前的低碳鋼包含0.04重量%至0.09重量%的碳，且包含矽、錳、鉻，以強化鋼材。然而，此種低碳鋼的碳含量仍過高，長時間儲存時容易產生時效硬化，而不利於精確加工。此外，此種低碳鋼的組織為肥粒鐵、波來鐵相及雪明碳鐵的混合組織，故延伸率低於40%。The current low carbon steel contains 0.04% to 0.09% by weight of carbon, and contains silicon, manganese, and chromium to strengthen the steel. However, the carbon content of such low-carbon steel is still too high, and it is prone to age hardening when stored for a long time, which is not conducive to precise processing. In addition, the structure of this kind of low-carbon steel is a mixed structure of ferrite, pleite phase, and Xueming carbon iron, so the elongation rate is less than 40%.
另有一種極低碳氮(Interstitial-Free；IF)鋼，其係將碳含量控制在0.005重量%以下，並添加鈮(Nb)、鈦(Ti)及釩(V)等合金以形成碳化鈮(NbC)、碳化鈦(TiC)或碳化釩(VC)等碳化物，以確保碳原子能被完全固定。因此，IF鋼是無固溶碳原子的單一軟質肥粒鐵組織、亦無硬度較硬的第二相組織且無碳原子的差排拖曳，而具有高深沖成形性及低時效性。所述低時效性係指在特定時間內，鋼材降伏應力之增加量較小，而使鋼材穩定度較高，且材料強度不會隨時間變化。然而，為了達成前述碳含量的目標，煉鋼製程耗能、耗時且較為不易。此外，鈮、鈦及釩等合金不易取得，成本高。再者，IF鋼屬於單相的肥粒鐵相，相轉變溫度高，故IF鋼的熱軋完軋溫度通常需要高於920℃，故能耗高。There is also a very low carbon nitrogen (Interstitial-Free; IF) steel, which controls the carbon content below 0.005% by weight and adds alloys such as niobium (Nb), titanium (Ti) and vanadium (V) to form niobium carbide (NbC), titanium carbide (TiC) or vanadium carbide (VC) and other carbides to ensure that the carbon atoms can be completely fixed. Therefore, IF steel is a single soft ferrous iron structure with no solid solution carbon atoms, no harder second phase structure and no differential drag of carbon atoms, and has high deep drawing formability and low aging. The low ageing property means that the increase in the yield stress of the steel is small within a certain period of time, so that the stability of the steel is high, and the strength of the material does not change with time. However, in order to achieve the aforementioned carbon content target, the steelmaking process consumes energy, time and is relatively difficult. In addition, alloys such as niobium, titanium and vanadium are not easy to obtain and costly. Furthermore, IF steel belongs to a single-phase ferrous iron phase and has a high phase transition temperature. Therefore, the hot-rolled finish temperature of IF steel usually needs to be higher than 920°C, so the energy consumption is high.
有鑑於此，亟需提供一種低碳鋼片及其製造方法，以解決上述問題。In view of this, there is an urgent need to provide a low-carbon steel sheet and a manufacturing method thereof to solve the above-mentioned problems.
因此，本發明之一態樣是提供一種低碳鋼片的製造方法，其係利用鋼胚中之特定成分及特定製程，以製得具有較細晶粒的低碳鋼片。Therefore, one aspect of the present invention is to provide a method for manufacturing a low-carbon steel sheet, which utilizes specific components in the steel billet and a specific manufacturing process to produce a low-carbon steel sheet with finer grains.
因此，本發明之另一態樣是提供一種低碳鋼片，其係利用前述方法所製得。此低碳鋼片具有低降伏、高延伸率及低時效性，而可應用於沖壓成形。Therefore, another aspect of the present invention is to provide a low carbon steel sheet, which is produced by the aforementioned method. This low carbon steel sheet has low yield, high elongation and low aging, and can be applied to stamping and forming.
根據本發明之上述態樣，提出一種低碳鋼片的製造方法，包含，先對鋼胚以至少1100℃進行再加熱處理。接著，對鋼胚進行熱軋製程，以獲得完軋鋼材，其中熱軋製程的完軋溫度至少為Ar3溫度。然後，對完軋鋼材以530℃至600℃進行盤捲步驟，以獲得熱軋鋼捲。接下來，對熱軋鋼捲進行冷軋步驟，以獲得冷軋鋼捲。再來，對冷軋鋼捲以650℃至690℃進行封盒式退火步驟，以獲得退火鋼板。之後，對退火鋼板進行調質軋延步驟，以獲得低碳鋼片。According to the above aspect of the present invention, a method for manufacturing a low carbon steel sheet is proposed, which includes first performing a reheating treatment on the steel blank at a temperature of at least 1100°C. Then, the steel billet is subjected to a hot rolling process to obtain a finished rolled steel material, wherein the finishing temperature of the hot rolling process is at least the Ar3 temperature. Then, the finished rolled steel is subjected to a coiling step at 530°C to 600°C to obtain a hot rolled steel coil. Next, a cold rolling step is performed on the hot-rolled steel coil to obtain a cold-rolled steel coil. Then, the cold-rolled steel coil is subjected to a sealed-box annealing step at 650° C. to 690° C. to obtain an annealed steel sheet. After that, the annealed steel sheet is subjected to a tempering and rolling step to obtain a low-carbon steel sheet.
依據本發明之一實施例，上述之鋼胚可選擇性地包含不大於0.050重量%的矽及不大於0.010重量%的氮。According to an embodiment of the present invention, the aforementioned steel blank may optionally contain not more than 0.050% by weight of silicon and not more than 0.010% by weight of nitrogen.
依據本發明之一實施例，上述之鋼胚實質上不包含鈮、鈦及釩。According to an embodiment of the present invention, the aforementioned steel blank does not substantially contain niobium, titanium, and vanadium.
依據本發明之一實施例，上述之低碳鋼片的製造方法可選擇性地於盤捲步驟前，對完軋鋼材進行冷卻處理。According to an embodiment of the present invention, the above-mentioned manufacturing method of low-carbon steel sheet can selectively cool the finished rolled steel before the coiling step.
依據本發明之一實施例，上述之封盒式退火步驟的時間為8小時至15小時。According to an embodiment of the present invention, the time of the above-mentioned box-sealing annealing step is 8 hours to 15 hours.
依據本發明之一實施例，上述之低碳鋼片的製造方法可選擇性地於調質軋延步驟前，對退火鋼板以10℃/小時至20℃/小時的平均速率降溫至室溫。According to an embodiment of the present invention, the aforementioned low carbon steel sheet manufacturing method can selectively cool the annealed steel sheet to room temperature at an average rate of 10° C./hour to 20° C./hour before the tempering and rolling step.
根據本發明之另一態樣，提出一種低碳鋼片，其係利用上述之低碳鋼片的製造方法所獲得，其中低碳鋼片包含平均粒徑為15 μm至45 μm的肥粒鐵相組織。According to another aspect of the present invention, a low-carbon steel sheet is provided, which is obtained by the above-mentioned manufacturing method of the low-carbon steel sheet, wherein the low-carbon steel sheet includes ferrous iron with an average particle size of 15 μm to 45 μm Phase organization.
依據本發明之一實施例，上述之低碳鋼片可選擇性地包含不高於10體積%的雪明碳鐵碳化物，其中雪明碳鐵碳化物是分散於肥粒鐵相組織中。According to an embodiment of the present invention, the aforementioned low-carbon steel sheet may optionally contain no more than 10% by volume of Xueming carbon iron carbide, wherein the Xueming carbon iron carbide is dispersed in the ferrite phase structure.
依據本發明之一實施例，上述之雪明碳鐵碳化物的平均粒徑為0.1 μm至5 μm。According to an embodiment of the present invention, the average particle size of the aforementioned Xueming carbon-iron carbide is 0.1 μm to 5 μm.
依據本發明之一實施例，上述之低碳鋼片的降伏強度為小於180 MPa、延伸率為大於45%，且經放置一段時間(例如：3個月或更久)後，此低碳鋼片之降伏強度差值為小於10 MPa。According to an embodiment of the present invention, the yield strength of the aforementioned low-carbon steel sheet is less than 180 MPa, the elongation is greater than 45%, and after being placed for a period of time (for example: 3 months or more), the low-carbon steel sheet The yield strength difference of the tablets is less than 10 MPa.
應用本發明之低碳鋼片及其製造方法，其係利用鋼胚中之特定成分及特定製程以細化晶粒，可製得低碳鋼片。所得的低碳鋼片具有低降伏、高延伸率及低時效性，而可藉由沖壓成形製得各種構件。The low-carbon steel sheet and the manufacturing method thereof of the present invention utilize specific components in the steel blank and a specific manufacturing process to refine the crystal grains, and the low-carbon steel sheet can be manufactured. The obtained low carbon steel sheet has low yield, high elongation and low aging, and various components can be made by stamping and forming.
承上所述，本發明提供一種低碳鋼片及其製造方法，其係利用鋼胚中之特定成分及特定製程以細化晶粒，可製得低碳鋼片。所得的低碳鋼片具有低降伏、高延伸率及低時效性，而具有高深沖成形性及加工性，故可藉由沖壓成形製得各種構件(例如：馬達外殼、餐飲鍋具、燈具外罩、熱水器外殼、電子配件及汽車板金配件等)。Based on the foregoing, the present invention provides a low-carbon steel sheet and a manufacturing method thereof, which utilizes specific components in the steel blank and a specific manufacturing process to refine the crystal grains, and the low-carbon steel sheet can be produced. The obtained low carbon steel sheet has low yield, high elongation and low aging, and has high deep drawing formability and processability. Therefore, various components (such as motor shells, dining pots, lamps and lanterns) can be made by stamping and forming. , Water heater shell, electronic accessories and automobile sheet metal accessories, etc.).
請參閱圖1，其係繪示根據本發明一實施例之低碳鋼片的製造方法100的流程圖。首先，如方法100之步驟110所示，提供鋼胚。鋼胚包含0.01重量%至0.03重量%的碳、0.10重量%至0.5重量%的錳、0.001重量%至0.030重量%的磷、0.0003重量%至0.0200重量%的硫、0.010重量%至0.300重量%的鋁，以及其餘量為鐵及不可避免的雜質。Please refer to FIG. 1, which shows a flowchart of a
所述碳可透過固溶強化鋼材的強度。當碳含量高於前述含量時，則硬度過高且延伸率不足，鋼材無法具有高深沖成形性。當碳含量低於前述含量時，則在煉鋼製程上較為耗能、耗時且不易藉由一般脫碳製程來達成。當錳含量高於前述含量時，則將降低鋼材的延伸率，而裂化加工性。當錳含量低於前述含量時，則無法有效脫硫和脫氧，導致無法增加鋼材的耐磨性與強度。當磷含量高於前述含量時，則易導致韌性劣化。當硫含量高於前述含量時，則夾雜於鋼材中的硫化物容易導致應力集中、降低力學性能。一般而言，磷及硫的含量亦是越低越佳，但要脫磷及脫硫到低於前述的含量，製程上較為不易。當鋁含量高於前述含量時，則將影響焊接性能並裂化加工性。當鋁含量低於前述含量時，則鋼材具有較差之延伸率及衝擊韌性。The carbon can strengthen the strength of the steel through solid solution. When the carbon content is higher than the aforementioned content, the hardness is too high and the elongation is insufficient, and the steel cannot have high deep drawing formability. When the carbon content is lower than the aforementioned content, the steelmaking process is more energy-consuming, time-consuming and not easily achieved by the general decarburization process. When the manganese content is higher than the aforementioned content, the elongation of the steel will be reduced, and the cracking workability will be affected. When the manganese content is lower than the aforementioned content, effective desulfurization and deoxidation cannot be achieved, resulting in failure to increase the wear resistance and strength of the steel. When the phosphorus content is higher than the aforementioned content, the toughness is easily deteriorated. When the sulfur content is higher than the aforementioned content, the sulfides contained in the steel are likely to cause stress concentration and reduce mechanical properties. Generally speaking, the lower the content of phosphorus and sulfur, the better, but it is more difficult to dephosphorize and desulfurize to lower than the aforementioned content. When the aluminum content is higher than the aforementioned content, it will affect the welding performance and cracking processability. When the aluminum content is lower than the aforementioned content, the steel has poor elongation and impact toughness.
在一實施例中，前述鋼胚可選擇性地包含不大於0.050重量%的矽。當矽含量為前述之範圍時，矽可促進肥粒鐵的析出，且兼顧鋼材的韌性與加工性。在一實施例中，前述鋼胚可選擇性地包含不大於0.010重量%的氮，而可使鋼材具有良好的加工性及深沖成形性。在另一實施例中，鋼胚實質上不包含鈮、鈦及釩，故相較於IF鋼，本發明之鋼材可具有較低之製造成本，且可維持鋼材的高深沖成形性及低時效性。In one embodiment, the aforementioned steel blank may optionally contain not more than 0.050% by weight of silicon. When the silicon content is in the aforementioned range, silicon can promote the precipitation of ferrous iron, and give consideration to the toughness and workability of the steel. In one embodiment, the aforementioned steel blank may optionally contain no more than 0.010% by weight of nitrogen, so that the steel has good workability and deep-drawing formability. In another embodiment, the steel billet does not substantially contain niobium, titanium, and vanadium. Therefore, compared with IF steel, the steel of the present invention can have a lower manufacturing cost, and can maintain high deep drawing formability and low aging of the steel. sex.
接著，如方法100之步驟112所示，對鋼胚以至少1100℃進行再加熱處理。若加熱溫度低於1100℃，則於後續降溫時將影響特定組織(例如：肥粒鐵相組織)的變化。Then, as shown in
然後，如方法100之步驟114所示，對鋼胚進行熱軋製程，以獲得完軋鋼材。熱軋製程的完軋溫度至少為Ar3溫度。Ar3溫度是冷卻過程中保持沃斯田鐵的最低溫度，Ar3溫度可藉由膨脹儀量測或用公式計算而得。換言之，熱軋製程係於沃斯田鐵相完成熱軋延。倘熱軋製程的完軋溫度低於Ar3，則將影響後續形成肥粒鐵相組織的晶相。在一實施例中，完軋溫度可例如為至少870℃。在一具體例中，熱軋製程的完軋溫度為不高於920℃，故相較於IF鋼之高於920℃的完軋溫度，使用本發明之製程可減少能耗。Then, as shown in
之後，如方法100之步驟116所示，對完軋鋼材以530℃至600℃進行盤捲步驟，以獲得熱軋鋼捲。倘盤捲步驟的溫度超出前述範圍之外，則無法產生特定晶粒尺寸的細晶肥粒鐵相組織，而無法得到高深沖成形性及低時效性的鋼材。在一實施例中，盤捲步驟的溫度為550℃至580℃。又在一實施例中，於盤捲步驟116前，可對完軋鋼材進行冷卻處理。After that, as shown in
再來，如方法100之步驟118所示，對熱軋鋼捲進行裁減率為70%至90%的冷軋步驟，以形成冷軋鋼捲，且於獲得冷軋鋼捲後，進行步驟120，對冷軋鋼捲以650℃至690℃進行封盒式退火步驟，以獲得退火鋼板。由於冷軋後晶粒潛藏大量應變能，倘封盒式退火的溫度超出前述範圍，過高之溫度將導致組織不均勻，而過低之溫度易使材料再結晶且使其成長不完全，進而無法達到所要求之機械性質。在一實施例中，封盒式退火步驟的時間為8小時至15小時。又在一實施例中，退火鋼板以10℃/小時至20℃/小時的平均速率降溫室溫(例如：10℃至40℃)，以達到所要求之機械性質。在一具體例中，退火鋼板之平均降溫速率為20℃/小時。Furthermore, as shown in
接著，如方法100之步驟122所示，對退火鋼板進行調質軋延步驟。在一實施例中，調質軋延步驟的裁減率為1.2%至2.5%，以微調鋼板機械性質，避免後續加工產生伸張應變痕。然後，如方法100之步驟124所示，獲得低碳鋼片。Next, as shown in
利用本發明之低碳鋼片的製造方法，所獲得的低碳鋼片包含平均粒徑為15 μm至45 μm的肥粒鐵相組織。所述肥粒鐵相組織的顯微結構為狹長形的肥粒鐵相組織。在一實施例中，低碳鋼片包含分散於肥粒鐵相組織中的雪明碳鐵碳化物之析出物，其中此些析出物(即雪明碳鐵碳化物)的平均粒徑為0.1 μm至5 μm，且以低碳鋼片的顯微組織為100體積%，雪明碳鐵碳化物的含量為不高於10體積%。在其他實施例中，以低碳鋼片的顯微組織為100體積%，雪明碳鐵碳化物的含量為不高於5體積%。在一實施例中，低碳鋼片的降伏強度為小於180 MPa、延伸率為大於45%，且經長時間(例如：至少三個月)放置後，低碳鋼片的降伏強度差值(ΔYS)為小於10 MPa，較佳為小於5 MPa。前述降伏強度差值係指，低碳鋼片產出3個月後的降伏強度扣除低碳鋼片產出時的降伏強度，所得的值。據此，本發明藉由使低含量之碳原子析出形成為雪明碳鐵碳化物，而將碳原子固定，因此可避免長時間放置時，碳原子移動所導致之強度提升。By using the method for manufacturing a low carbon steel sheet of the present invention, the obtained low carbon steel sheet contains a ferrous iron phase structure with an average particle size of 15 μm to 45 μm. The microstructure of the ferrous iron phase structure is a long and narrow ferrous iron phase structure. In one embodiment, the low-carbon steel sheet contains precipitates of Xueming iron carbide carbides dispersed in the ferrite phase structure, wherein the average particle size of these precipitates (ie, Xueming iron carbide carbides) is 0.1 μm to 5 μm, and the microstructure of the low-carbon steel sheet is 100% by volume, and the content of Xueming carbon iron carbide is not more than 10% by volume. In other embodiments, the microstructure of the low-carbon steel sheet is 100% by volume, and the content of Xueming carbon iron carbide is not higher than 5% by volume. In one embodiment, the yield strength of the low carbon steel sheet is less than 180 MPa, the elongation is greater than 45%, and after being placed for a long time (for example: at least three months), the yield strength difference of the low carbon steel sheet ( ΔYS) is less than 10 MPa, preferably less than 5 MPa. The aforementioned yield strength difference refers to the yield strength of low-carbon steel sheets after 3 months of production after subtracting the yield strength of low-carbon steel sheets when they are produced. Accordingly, the present invention fixes the carbon atoms by precipitating low-content carbon atoms into Xueming carbon-iron carbides, thereby avoiding the increase in strength caused by the movement of carbon atoms when stored for a long time.
以下利用數個實施例以說明本發明之應用，然其並非用以限定本發明，本發明技術領域中具有通常知識者，在不脫離本發明之精神和範圍內，當可作各種之更動與潤飾。Several embodiments are used below to illustrate the application of the present invention, but they are not used to limit the present invention. Those with ordinary knowledge in the technical field of the present invention can make various changes and modifications without departing from the spirit and scope of the present invention. Retouch.
實施例1Example 1
實施例1是依據表1之鋼胚組成成分調配後，依照上述之低碳鋼片的製造方法100及表1之製程條件進行煉鋼。首先，提供鋼胚，鋼胚包含0.01重量%至0.03重量%的碳、0.10重量%至0.5重量%的錳、0.001重量%至0.030重量%的磷、0.0003重量%至0.0200重量%的硫、0.010重量%至0.300重量%的鋁、不大於0.050重量%的矽、不大於0.010重量%的氮以及其餘量為鐵及不可避免的雜質，且鋼胚實質上不包含鈮、鈦及釩。Example 1 is based on the composition of the steel billet in Table 1, and then steelmaking is carried out in accordance with the above-mentioned
接著，對鋼胚以至少1100℃進行再加熱處理後，進行熱軋製程，其中熱軋製程的完軋溫度為至少870℃並進行冷卻處理。之後，以530℃至600℃進行盤捲步驟，以獲得熱軋鋼捲。再來，對熱軋鋼捲進行裁減率為70%至90%的冷軋步驟後，以650℃至690℃進行封盒式退火步驟，以獲得退火鋼板。封盒式退火步驟的時間為8小時至15小時且以20℃/小時的速率降溫室溫(例如：10℃至40℃)。接著，對退火鋼板進行裁減率為1.2%至2.5%的調質軋延步驟，以獲得低碳鋼片。Next, after reheating the steel billet at at least 1100°C, a hot rolling process is performed, wherein the finishing temperature of the hot rolling process is at least 870°C and a cooling treatment is performed. After that, a coiling step is performed at 530°C to 600°C to obtain hot-rolled steel coils. Furthermore, after the hot-rolled steel coil is subjected to a cold rolling step with a cut rate of 70% to 90%, a sealed box annealing step is performed at 650° C. to 690° C. to obtain an annealed steel sheet. The time of the box-sealed annealing step is 8 hours to 15 hours, and the room temperature is lowered at a rate of 20° C./hour (for example, 10° C. to 40° C.). Next, the annealed steel sheet is subjected to a tempering rolling step with a cut rate of 1.2% to 2.5% to obtain a low carbon steel sheet.
所獲得的低碳鋼片具有平均粒徑為15 μm至45 μm的狹長形肥粒鐵相組織，及分散於肥粒鐵相組織中的雪明碳鐵碳化物之析出物，其中雪明碳鐵碳化物的平均粒徑為0.1 μm至5 μm，且含量為不高於5體積%。此外，所獲得的低碳鋼片另依照日本工業標準(JIS)第JIS Z2241號的標準檢測方法進行拉伸試驗，有關鋼胚組成成分及低碳鋼製程條件與評價結果如第1表所示。The obtained low-carbon steel sheet has a long and narrow fat iron phase structure with an average particle size of 15 μm to 45 μm, and precipitates of snow carbon iron carbide dispersed in the fat iron phase structure, wherein snow carbon The average particle size of the iron carbide is 0.1 μm to 5 μm, and the content is not more than 5 vol%. In addition, the obtained low-carbon steel sheets were subjected to tensile tests in accordance with the Japanese Industrial Standards (JIS) No. JIS Z2241 standard testing method. The composition of the steel billet and the processing conditions and evaluation results of the low-carbon steel are shown in Table 1. .
實施例2至實施例3及比較例1與比較例2Example 2 to Example 3 and Comparative Example 1 and Comparative Example 2
實施例2至實施例3及比較例1與比較例2大致上是依照實施例1的製程方法製造鋼材，其差異在於鋼胚組成成分及/或各製程的溫度。實施例2至實施例3及比較例1與比較例2所使用鋼胚之組成成分及低碳鋼製程條件與評價結果如第1表所示。Example 2 to Example 3 and Comparative Example 1 and Comparative Example 2 are generally manufactured according to the process method of Example 1, and the difference lies in the composition of the steel billet and/or the temperature of each process. The composition of the steel blanks used in Examples 2 to 3, Comparative Example 1 and Comparative Example 2, and low-carbon steel process conditions and evaluation results are shown in Table 1.
根據以上實施例及比較例的結果，實施例1至實施例3之利用包含特定成分及特定完軋溫度所製得的低碳鋼片，其降伏強度為小於180 MPa、延伸率為大於45%且降伏強度差值(ΔYS)為小於5 MPa，且具有高深沖成形性及低時效性。相較之下，比較例1的降伏強度為210 MPa，且延伸率為42%，其深沖成形性不足。此外，比較例2雖能達到所要求的機械性質，然而其包含鈮、鈦及釩，因此成本較高，不利用工業上應用。According to the results of the above examples and comparative examples, the low-carbon steel sheets prepared by using specific ingredients and specific finishing temperatures in Examples 1 to 3 have yield strength less than 180 MPa and elongation greater than 45% And the yield strength difference (ΔYS) is less than 5 MPa, and it has high deep drawing formability and low aging. In comparison, the yield strength of Comparative Example 1 is 210 MPa, and the elongation is 42%, and its deep drawing formability is insufficient. In addition, although Comparative Example 2 can achieve the required mechanical properties, it contains niobium, titanium, and vanadium, so the cost is relatively high, and industrial applications are not used.
由上述實施例可知，本發明之低碳鋼片及其製造方法，其優點在於利用包含特定成分之鋼胚及特定製程，以細化所製得之低碳鋼片的晶粒組織。所得的低碳鋼片具有低降伏、高延伸率及低時效性，而具有高深沖成形性及易加工性，故可藉由沖壓成形製得各種構件。It can be seen from the above-mentioned embodiments that the low carbon steel sheet and the manufacturing method thereof of the present invention have the advantage of using a steel billet containing a specific composition and a specific manufacturing process to refine the grain structure of the low carbon steel sheet produced. The obtained low carbon steel sheet has low yield, high elongation and low aging, and has high deep drawing formability and easy processing, so various components can be made by stamping and forming.
雖然本發明已以實施方式揭露如上，然其並非用以限定本發明，在本發明所屬技術領域中任何具有通常知識者，在不脫離本發明之精神和範圍內，當可作各種之更動與潤飾，因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field of the present invention can make various changes and modifications without departing from the spirit and scope of the present invention. Retouching, therefore, the scope of protection of the present invention shall be subject to the scope of the attached patent application.
100:方法 110,112,114,116,118,120,122,124:步驟100: method 110,112,114,116,118,120,122,124: steps
為了對本發明之實施例及其優點有更完整之理解，現請參照以下之說明並配合相應之圖式。必須強調的是，各種特徵並非依比例描繪且僅係為了圖解目的。相關圖式內容說明如下： 圖1係繪示根據本發明一實施例之低碳鋼片的製造方法之流程圖。In order to have a more complete understanding of the embodiments of the present invention and its advantages, please refer to the following description and the corresponding drawings. It must be emphasized that the various features are not drawn to scale and are for illustration purposes only. The contents of the relevant diagrams are described as follows: FIG. 1 is a flowchart of a method for manufacturing a low-carbon steel sheet according to an embodiment of the present invention.
國內寄存資訊(請依寄存機構、日期、號碼順序註記) 無 國外寄存資訊(請依寄存國家、機構、日期、號碼順序註記) 無Domestic deposit information (please note in the order of deposit institution, date and number) none Foreign hosting information (please note in the order of hosting country, institution, date, and number) none
100:方法100: method
110,112,114,116,118,120,122,124:步驟110,112,114,116,118,120,122,124: steps
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