TWI779686B - Steel material for hot-stamping and method of manufacturing steel material - Google Patents

Steel material for hot-stamping and method of manufacturing steel material Download PDF

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TWI779686B
TWI779686B TW110123255A TW110123255A TWI779686B TW I779686 B TWI779686 B TW I779686B TW 110123255 A TW110123255 A TW 110123255A TW 110123255 A TW110123255 A TW 110123255A TW I779686 B TWI779686 B TW I779686B
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steel
oxide layer
dense oxide
hot stamping
steel substrate
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TW202300665A (en
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林思寧
王偉霖
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中國鋼鐵股份有限公司
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Abstract

A steel material for hot-stamping and a method of manufacturing steel material are provided. In the method of manufacturing the steel material, at first, a steel substrate, for example a steel of MnB is provided. Thereafter, an annealing process is performed on the steel material to form a dense oxide layer on the steel substrate. The dense oxide layer has a reticulated structure. The reticulated structure has apertures each having a size ranged from 0.1 μm to 0.5 μm. The dense oxide layer includes Fe2O3 equal to or more than10 wt%. The annealing process has a soaking temperature ranged from 600℃ to 750℃.

Description

熱沖壓用鋼材與鋼材製造方法 Steel material for hot stamping and steel material manufacturing method

本發明是有關於一種熱沖壓用鋼材與鋼材製造方法。 The invention relates to a steel material for hot stamping and a steel material manufacturing method.

錳硼鋼材使用熱沖壓成形已行之有年。隨著汽車產業的發展，對於高強度機械性質的需求提高，更加速了錳硼鋼材與熱沖壓技術的發展。在現行的製程中，通常將鋼材升溫到沃斯田鐵化溫度以上，並在鋼材仍舊較軟的情況下，進行熱沖壓成形。例如，以模具使得鋼材形成所需形狀，並在模具內部進行冷卻，以形成高強度的全麻散鐵組織。 Manganese-boron steels have been formed by hot stamping for many years. With the development of the automobile industry, the demand for high-strength mechanical properties has increased, which has accelerated the development of manganese-boron steel and hot stamping technology. In the current manufacturing process, the temperature of the steel is usually raised above the ironization temperature of Worthfield, and hot stamping is carried out while the steel is still relatively soft. For example, a mold is used to form the steel into the desired shape, and it is cooled inside the mold to form a high-strength general anesthesia loose iron structure.

然而，在熱沖壓製程中，鋼材會產生鏽皮，這些鏽皮容易在鋼材成形的過程中脫落而污染模具表面，進而影響冷卻的效果。再者，鏽皮脫落也會因為四處飛散而造成環境汙染，或者鏽皮累積壓入成品造成缺陷，造成模具磨損縮短模具壽命等不良影響。 However, in the hot stamping process, the steel will produce scales, which are easy to fall off during the forming process of the steel and pollute the surface of the mold, thereby affecting the cooling effect. Furthermore, the peeling off of the scale will also cause environmental pollution due to flying around, or the accumulated scale will be pressed into the finished product to cause defects, causing mold wear and shortening the life of the mold and other adverse effects.

本發明之實施例提出一種熱沖壓用鋼材與鋼材製造方法，其可形成緻密氧化層(鏽皮)在鋼基材(例如錳硼鋼)表面上，使得此鋼基材在後續的熱沖壓製程中因保存此緻密氧化層而可以抵抗材料表面在沖壓成形過程中的鏽皮裂縫成長，進而阻止鏽皮破裂而剝落的現象。 Embodiments of the present invention propose a steel for hot stamping and a steel manufacturing method, which can form a dense oxide layer (scale) on the surface of a steel substrate (such as manganese-boron steel), so that the steel substrate can be used in the subsequent hot stamping process Due to the preservation of this dense oxide layer, it can resist the growth of scale cracks on the surface of the material during the stamping process, thereby preventing the scale from cracking and peeling off.

根據本發明之一實施例，此熱沖壓用鋼材包含鋼基材以及緻密氧化層。緻密氧化層，形成於此鋼基材上，其中緻密氧化層具有一網狀結構，此網狀結構之孔隙尺寸介於0.1微米(μm)至0.5微米之間，以此緻密氧化層為100為重量百分比計，此緻密氧化層包含10重量百分比以上的三氧化二鐵(Fe2O3)。 According to an embodiment of the present invention, the steel material for hot stamping includes a steel substrate and a dense oxide layer. A dense oxide layer is formed on the steel substrate, wherein the dense oxide layer has a network structure, and the pore size of the network structure is between 0.1 micron (μm) and 0.5 micron, so that the dense oxide layer is 100 In terms of weight percent, the dense oxide layer contains more than 10 weight percent of ferric oxide (Fe 2 O 3 ).

在一些實施例中，緻密氧化層之厚度介於1微米至3微米之間。 In some embodiments, the thickness of the dense oxide layer is between 1 micron and 3 microns.

在一些實施例中，緻密氧化層更包含四氧化三鐵(Fe3O4)。 In some embodiments, the dense oxide layer further includes iron oxide (Fe 3 O 4 ).

在一些實施例中，鋼基材為錳硼鋼。 In some embodiments, the steel substrate is manganese boron steel.

在一些實施例中，以此鋼基材為100為重量百分比計，鋼基材包含0.19~0.25重量百分比的碳(C)、1.10~1.40重量百分比的錳(Mn)、0.0008~0.005重量百分比的鈦(Ti)、0.10~0.35的鉻(Cr)，不顯著之雜質以及平衡量之鐵(Fe)。 In some embodiments, based on 100 percent by weight of the steel substrate, the steel substrate includes 0.19 to 0.25 percent by weight of carbon (C), 1.10 to 1.40 percent by weight of manganese (Mn), 0.0008 to 0.005 percent by weight of Titanium (Ti), 0.10~0.35 chromium (Cr), insignificant impurities and iron (Fe) in balance.

根據本發明之一實施例，前述之鋼材製造方法包含：提供一鋼基材；以及對此鋼基材進行一退火製程，以於鋼 基材上形成一緻密氧化層，其中此緻密氧化層具有一網狀結構，此網狀結構之孔隙尺寸介於0.1微米至0.5微米之間，以此緻密氧化層為100為重量百分比計，以此緻密氧化層為100為重量百分比計，此緻密氧化層包含10重量百分比以上的三氧化二鐵(Fe2O3)。 According to an embodiment of the present invention, the aforementioned steel manufacturing method includes: providing a steel substrate; and performing an annealing process on the steel substrate to form a dense oxide layer on the steel substrate, wherein the dense oxide layer has A network structure, the pore size of the network structure is between 0.1 micron and 0.5 micron, the dense oxide layer is 100% by weight, the dense oxide layer is 100% by weight, the dense oxide layer Contains more than 10% by weight of ferric oxide (Fe 2 O 3 ).

在一些實施例中，上述之退火製程一均溫溫度介於600℃至750℃之間。 In some embodiments, the annealing process-average temperature is between 600°C and 750°C.

在一些實施例中，退火製程之一均溫退火時間介於60秒至70秒之間。 In some embodiments, one of the temperature soak annealing time of the annealing process is between 60 seconds and 70 seconds.

在一些實施例中，前述之鋼材製造方法更包含：於退火製程後，對鋼基材進行熱沖壓製程。 In some embodiments, the aforementioned steel manufacturing method further includes: performing a hot stamping process on the steel substrate after the annealing process.

在一些實施例中，前述之熱沖壓製程之溫度介於900℃~930℃之間，且於1體積百分比之甲烷(CH4)以及99體積百分比之氮氣(N2)的環境下進行。 In some embodiments, the temperature of the aforementioned hot stamping process is between 900° C. and 930° C., and is carried out in an environment of 1 volume percent of methane (CH 4 ) and 99 volume percent of nitrogen (N 2 ).

為讓本發明的上述特徵和優點能更明顯易懂，下文特舉實施例，並配合所附圖式作詳細說明如下。 In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.

100:鋼材製造方法 100: Steel manufacturing methods

110~150:步驟 110~150: steps

210:緻密氧化層 210: dense oxide layer

220:鋼基材 220: steel substrate

圖1係繪示根據本發明一實施例之鋼材製造方法的流程示意圖。 FIG. 1 is a schematic flow diagram illustrating a steel manufacturing method according to an embodiment of the present invention.

圖2係繪示根據本發明之實施例之緻密氧化層的示意圖。 FIG. 2 is a schematic diagram illustrating a dense oxide layer according to an embodiment of the present invention.

圖3為根據本發明實施例之緻密氧化層的掃描式電子顯微鏡照片。 FIG. 3 is a scanning electron micrograph of a dense oxide layer according to an embodiment of the present invention.

圖4係繪示鋼基材在各種不同均溫退火溫度下的氧化鏽皮剝落現象。 Figure 4 is a series of graphs showing the peeling off of oxide scales on steel substrates under various soaking annealing temperatures.

請參照圖1，其係繪示根據本發明一實施例之鋼材製造方法100的流程示意圖。在本實施例中，鋼材製造方法100是用以製造出適合用於熱沖壓製程，可避免鏽皮剝落之熱沖壓用鋼材。 Please refer to FIG. 1 , which is a schematic flowchart of a steel manufacturing method 100 according to an embodiment of the present invention. In this embodiment, the steel manufacturing method 100 is used to manufacture steel for hot stamping that is suitable for hot stamping and can avoid scale peeling off.

在鋼材製造方法100中，首先進行步驟110，以提供一鋼基材。在本實施例中，鋼基材為錳硼鋼(亦稱為22MnB5)之基材。在一些實施例中，以鋼基材為100重量百分比計，鋼基材可包含0.19~0.25重量百分比(wt%)的碳(C)、1.10~1.40重量百分比的錳(Mn)、0.0008~0.005重量百分比的鈦(Ti)、0.10~0.35的鉻(Cr)，不顯著之雜質以及平衡量之鐵(Fe)。 In the steel manufacturing method 100, step 110 is firstly performed to provide a steel substrate. In this embodiment, the steel substrate is a substrate of manganese boron steel (also known as 22MnB5). In some embodiments, based on 100 weight percent of the steel substrate, the steel substrate may include 0.19-0.25 weight percent (wt%) carbon (C), 1.10-1.40 weight percent manganese (Mn), 0.0008-0.005 Titanium (Ti), 0.10-0.35 chromium (Cr), insignificant impurities and iron (Fe) in balance.

然後，進行步驟120，以對鋼基材進行鑄造製程。在一些實施例中，在步驟120中，通過轉爐冶煉，連鑄成扁鋼胚、熱軋再加熱、粗軋、精軋、層冷、冷軋等製程後，可將鋼基材加工成所需厚度的鋼基材(鋼板)。然而，本發明之實施例並不受限於此。在本發明之其他實施例中，步驟120的鑄造製程可根據使用者需要來進行調整，以製造出符合使用者需求之鋼基材。 Then, step 120 is performed to perform a casting process on the steel substrate. In some embodiments, in step 120, through converter smelting, continuous casting into slabs, hot rolling and reheating, rough rolling, finish rolling, layer cooling, cold rolling and other processes, the steel substrate can be processed into the desired Steel base material (steel plate) of required thickness. However, embodiments of the present invention are not limited thereto. In other embodiments of the present invention, the casting process in step 120 can be adjusted according to the user's needs, so as to manufacture a steel base material that meets the user's needs.

接著，進行步驟130，以對鋼基材進行退火製程，來於鋼基材表面上形成緻密氧化層(亦可視為氧化鏽皮)。 請參照圖2，其係繪示根據本發明之實施例之緻密氧化層的示意圖。緻密氧化層210係形成於鋼基材220上，且由三氧化二鐵(Fe2O3)與四氧化三鐵(Fe3O4)所組成。在本實施例中，三氧化二鐵大致形成於鋼基材220外側，而四氧化三鐵大致形成於鋼基材220與三氧化二鐵之間。 Next, step 130 is performed to perform an annealing process on the steel substrate to form a dense oxide layer (also referred to as oxide scale) on the surface of the steel substrate. Please refer to FIG. 2 , which is a schematic diagram illustrating a dense oxide layer according to an embodiment of the present invention. The dense oxide layer 210 is formed on the steel substrate 220 and is composed of ferric oxide (Fe 2 O 3 ) and ferric oxide (Fe 3 O 4 ). In this embodiment, Fe2O3 is formed approximately outside the steel substrate 220 , and Fe3O4 is approximately formed between the steel substrate 220 and Fe2O3.

退火製程可為連續退火製程，其均溫溫度係介於600℃至750℃之間，以利形成緻密氧化層210。在本實施例中，退火製程爐氛為直火式爐氛，空燃比為1：1，均溫退火時間為60~70秒。然而，本發明之實施例並不受限於此。使用者可依照所需的氧化層厚度去調整，例如均溫退火時間，以滿足使用者之需求。 The annealing process can be a continuous annealing process, and the average temperature is between 600° C. and 750° C. to facilitate the formation of the dense oxide layer 210 . In this embodiment, the furnace atmosphere of the annealing process is a direct-fired furnace atmosphere, the air-fuel ratio is 1:1, and the uniform temperature annealing time is 60-70 seconds. However, embodiments of the present invention are not limited thereto. Users can adjust according to the desired thickness of the oxide layer, such as the soaking annealing time, to meet the user's needs.

請參照圖3，其為根據本發明實施例之緻密氧化層210的掃描式電子顯微鏡照片。如圖3所示，緻密氧化層210具有緻密的網狀結構，網狀結構具有緊密排列的孔隙。在本實施例中，孔隙之尺寸介於0.1微米(μm)至0.5微米之間。在本發明之一些實施例中，以緻密氧化層210為100重量百分比計，緻密氧化層210可包含10重量百分比以上的三氧化二鐵。在本發明之另一實施例中，緻密氧化層可包含30重量百分比的三氧化二鐵。在本發明之再一實施例中，緻密氧化層可包含超過30重量百分比的三氧化二鐵。 Please refer to FIG. 3 , which is a scanning electron micrograph of a dense oxide layer 210 according to an embodiment of the present invention. As shown in FIG. 3 , the dense oxide layer 210 has a dense network structure, and the network structure has closely arranged pores. In this embodiment, the size of the pores is between 0.1 micron (μm) and 0.5 micron. In some embodiments of the present invention, based on 100 weight percent of the dense oxide layer 210 , the dense oxide layer 210 may contain more than 10 weight percent of Fe2O3. In another embodiment of the present invention, the dense oxide layer may contain 30% by weight of Fe2O3. In yet another embodiment of the present invention, the dense oxide layer may contain more than 30 weight percent of Fe2O3.

請回到圖1，在步驟130後，接著進行步驟140，以對鋼基材進行沃斯田鐵化製程。在本實施例中，沃斯田鐵化製程係在溫度930℃、保護性氣氛為1體積百分比 (vol%)之甲烷(CH4)以及99體積百分比之氮氣(N2)的環境下進行，其中沃斯田鐵化製程的在爐時間為5分鐘。 Please return to FIG. 1 , after step 130 , proceed to step 140 , to perform a worth field ironing process on the steel substrate. In this embodiment, the ferrochemical process of Worthfield is carried out at a temperature of 930°C and a protective atmosphere of 1 volume percent (vol%) of methane (CH 4 ) and 99 volume percent of nitrogen (N 2 ). Among them, the in-furnace time of the Wostian iron-making process is 5 minutes.

然後，進行步驟150，以對鋼基材進行熱沖壓製程，而獲得使用者所需的成形鋼材。在本實施例中，熱沖壓製程之環境係類似於前述之斯田鐵化製程。例如，熱沖壓製程之溫度介於900℃~930℃之間，且於1體積百分比之甲烷以及99體積百分比之氮氣的環境下進行。 Then, step 150 is performed to perform a hot stamping process on the steel substrate to obtain the shaped steel required by the user. In this embodiment, the environment of the hot stamping process is similar to that of the above-mentioned stian ironing process. For example, the temperature of the hot stamping process is between 900° C. and 930° C., and it is carried out in an environment of 1 volume percent methane and 99 volume percent nitrogen.

請參照圖4，其係繪示鋼基材在各種不同均溫退火溫度下的氧化鏽皮剝落現象。如圖4所示，在均溫退火溫度為室溫、400℃以及500℃的比較例1~3中，鋼基材經過熱沖壓後，會呈現嚴重的鏽皮脫落現象，其中比較例1的鏽皮已大部分剝落。相較之下，在均溫退火溫度為600℃以及700℃的本發明實施例1~2中，未有明顯的鏽皮脫落現象。由此可知，本發明實施例之緻密氧化層210可確實地阻擋因沖壓製程產生的裂痕。換句話說，緻密氧化層210僅存在細微裂痕(最大寬度約為0.1微米)，裂痕不會擴大和延伸。 Please refer to FIG. 4 , which shows the peeling off of the oxide scale of the steel substrate under various soaking annealing temperatures. As shown in Figure 4, in comparative examples 1-3 where the soaking annealing temperature is room temperature, 400°C and 500°C, the steel base material will show serious scale peeling after hot stamping, and the steel base material in comparative example 1 The rust has mostly peeled off. In contrast, in Examples 1-2 of the present invention where the soaking annealing temperature is 600° C. and 700° C., there is no obvious scaling phenomenon. It can be seen from the above that the dense oxide layer 210 of the embodiment of the present invention can reliably block the cracks generated by the stamping process. In other words, there are only fine cracks (with a maximum width of about 0.1 micron) in the dense oxide layer 210, and the cracks will not expand and extend.

綜合以上所述，本發明之實施例係利用鋼材生產中的退火製程來於鋼材表面形成緻密氧化層(鏽皮)。此緻密氧化層具有緻密網狀結構，且可於後續熱沖壓/熱處理製造過程中保存下來，以抵抗材料表面在熱沖壓過程中的裂縫成長/擴大，進而阻止了鏽皮破裂而剝落的現象。如此，可提升熱沖壓部件的生產效率，並增加模具壽命。 Based on the above, the embodiment of the present invention uses the annealing process in the production of steel to form a dense oxide layer (scale) on the surface of the steel. This dense oxide layer has a dense network structure and can be preserved in the subsequent hot stamping/heat treatment manufacturing process to resist the crack growth/enlargement on the surface of the material during the hot stamping process, thereby preventing the scale from cracking and peeling off. In this way, the production efficiency of hot stamped parts can be improved, and the life of the die can be increased.

雖然本發明已以實施例揭露如上，然其並非用以限 定本發明，任何所屬技術領域中具有通常知識者，在不脫離本發明的精神和範圍內，當可作些許的更動與潤飾，故本發明的保護範圍當視後附的申請專利範圍所界定者為準。 Although the present invention has been disclosed above with embodiments, it is not intended to limit To determine the present invention, any person with ordinary knowledge in the technical field may make some changes and modifications without departing from the spirit and scope of the present invention, so the protection scope of the present invention should be defined by the scope of the appended patent application prevail.

210:緻密氧化層 210: dense oxide layer

220:鋼基材 220: steel substrate

Claims (9)

一種熱沖壓用鋼材，包含：一鋼基材，其中以該鋼基材為100為重量百分比計，該鋼基材包含0.19~0.25重量百分比的碳(C)、1.10~1.40重量百分比的錳(Mn)、0.0008~0.005重量百分比的鈦(Ti)、0.10~0.35的鉻(Cr)，不顯著之雜質以及平衡量之鐵(Fe)；以及一緻密氧化層，形成於該鋼基材上，其中該緻密氧化層具有一網狀結構，該網狀結構之孔隙尺寸介於0.1微米(μm)至0.5微米之間，以該緻密氧化層為100重量百分比計，該緻密氧化層包含10重量百分比以上的三氧化二鐵(Fe2O3)。 A steel material for hot stamping, comprising: a steel substrate, wherein the steel substrate contains 0.19 to 0.25 weight percent of carbon (C), 1.10 to 1.40 weight percent of manganese ( Mn), 0.0008~0.005% by weight of titanium (Ti), 0.10~0.35% of chromium (Cr), insignificant impurities and a balance of iron (Fe); and a dense oxide layer formed on the steel substrate, Wherein the dense oxide layer has a network structure, the pore size of the network structure is between 0.1 micron (μm) and 0.5 micron, based on 100 weight percent of the dense oxide layer, the dense oxide layer contains 10 weight percent The above ferric oxide (Fe 2 O 3 ). 如請求項1所述之熱沖壓用鋼材，其中該緻密氧化層之厚度介於1微米至3微米之間。 The steel for hot stamping as described in claim 1, wherein the thickness of the dense oxide layer is between 1 micron and 3 microns. 如請求項1所述之熱沖壓用鋼材，其中該緻密氧化層更包含四氧化三鐵(Fe3O4)。 The steel material for hot stamping according to claim 1, wherein the dense oxide layer further includes iron oxide (Fe 3 O 4 ). 如請求項1所述之熱沖壓用鋼材，其中該鋼基材為錳硼鋼。 The steel for hot stamping according to Claim 1, wherein the steel base material is manganese-boron steel. 一種鋼材製造方法，包含：提供一鋼基材，其中以該鋼基材為100為重量百分比計， 該鋼基材包含0.19~0.25重量百分比的碳(C)、1.10~1.40重量百分比的錳(Mn)、0.0008~0.005重量百分比的鈦(Ti)、0.10~0.35的鉻(Cr)，不顯著之雜質以及平衡量之鐵(Fe)；以及對該鋼基材進行一退火製程，以於該鋼基材上形成一緻密氧化層，其中該緻密氧化層具有一網狀結構，該網狀結構之孔隙尺寸介於0.1微米至0.5微米之間，以該緻密氧化層為100重量百分比計，該緻密氧化層包含10重量百分比以上的三氧化二鐵(Fe2O3)。 A steel manufacturing method, comprising: providing a steel substrate, wherein the steel substrate contains 0.19-0.25 weight percent carbon (C), 1.10-1.40 weight percent manganese ( Mn), 0.0008~0.005% by weight of titanium (Ti), 0.10~0.35% of chromium (Cr), insignificant impurities and iron (Fe) in balance; A dense oxide layer is formed on the steel substrate, wherein the dense oxide layer has a network structure, and the pore size of the network structure is between 0.1 micron and 0.5 micron, based on 100 weight percent of the dense oxide layer, the The dense oxide layer contains more than 10% by weight of ferric oxide (Fe 2 O 3 ). 如請求項5所述之鋼材製造方法，其中該退火製程之一均溫溫度介於600℃至750℃之間。 The steel manufacturing method as described in Claim 5, wherein an average temperature of the annealing process is between 600°C and 750°C. 如請求項5所述之鋼材製造方法，其中該退火製程之一均溫退火時間介於60秒至70秒之間。 The steel manufacturing method as described in claim 5, wherein the soaking annealing time of the annealing process is between 60 seconds and 70 seconds. 如請求項5所述之鋼材製造方法，更包含：於該退火製程後，對該鋼基材進行一熱沖壓製程。 The steel manufacturing method as described in claim 5 further comprises: after the annealing process, performing a hot stamping process on the steel substrate. 如請求項8所述之鋼材製造方法，其中該熱沖壓製程之溫度介於900℃~930℃之間，且於1體積百分比之甲烷(CH4)以及99體積百分比之氮氣(N2)的環境下進行。 The steel manufacturing method as described in Claim 8, wherein the temperature of the hot stamping process is between 900°C and 930°C, and the temperature is between 1 volume percent of methane (CH 4 ) and 99 volume percent of nitrogen (N 2 ). environment.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW201402828A (en) * 2012-07-09 2014-01-16 China Steel Corp Method for manufacturing low carbon steel material
WO2016158961A1 (en) * 2015-03-31 2016-10-06 新日鐵住金株式会社 Steel sheet for hot stamping, method for manufacturing same, and hot stamp molded article
CN111057811A (en) * 2019-12-20 2020-04-24 唐山钢铁集团高强汽车板有限公司 Smelting method of low-cost high-quality steel for hot stamping forming
US20200224297A1 (en) * 2016-11-24 2020-07-16 Arcelormittal Hot-rolled and coated steel sheet for hot-stamping, hot-stamped coated steel part and methods for manufacturing the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW201402828A (en) * 2012-07-09 2014-01-16 China Steel Corp Method for manufacturing low carbon steel material
WO2016158961A1 (en) * 2015-03-31 2016-10-06 新日鐵住金株式会社 Steel sheet for hot stamping, method for manufacturing same, and hot stamp molded article
US20200224297A1 (en) * 2016-11-24 2020-07-16 Arcelormittal Hot-rolled and coated steel sheet for hot-stamping, hot-stamped coated steel part and methods for manufacturing the same
CN111057811A (en) * 2019-12-20 2020-04-24 唐山钢铁集团高强汽车板有限公司 Smelting method of low-cost high-quality steel for hot stamping forming

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