CN115821167B - Ultrahigh-strength saddle plate and manufacturing method thereof - Google Patents
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Abstract
The application relates to the technical field of automobile traction components, and specifically discloses an ultrahigh-strength saddle plate and a manufacturing method thereof, wherein the ultrahigh-strength saddle plate comprises the following raw materials in percentage by mass: 0.15 to 0.35 percent of C, 1.0 to 1.8 percent of Mn, less than or equal to 0.5 percent of Si, less than or equal to 0.005 percent of B, 0.0015 to 0.035 percent of Zr, 0.15 to 0.2 percent of Al and ZrB 2 0.002‑0.007%，ZrO 2 0.001-0.004%, and the rest is iron; the manufacturing method comprises the following steps: smelting: uniformly stirring and smelting the raw materials in a vacuum induction furnace, and casting into a steel plate; step two, homogenizing: heating the steel plate under the protection of inert gas, preserving heat, cooling to normal temperature in air, rolling into a required material thickness, and cutting into part blanks; step three, hot stamping forming: and (3) firstly cold stamping the blank obtained in the step two by using a preformed die, then rapidly moving the blank into the die to stamp, maintaining the pressure, and quenching to obtain the saddle plate. It has the effect of obtaining the saddle plate with ultra-high strength while guaranteeing the lightweight.
Description
Technical Field
The invention relates to the technical field of automobile traction components, in particular to an ultrahigh-strength saddle plate and a manufacturing method thereof.
Background
The saddle plate is a connecting device arranged between the tractor frame and the saddle, and is used for connecting the saddle and the tractor frame into a whole and realizing the connection of the semi-trailer main vehicle and the trailer through the connection of the saddle and the trailer.
In the related art, the saddle plate is generally made of low-strength steel, and the saddle plate is thickened to achieve the required final performance; when the saddle plate is produced by using high-strength steel, the saddle plate is bent, and the whole saddle plate is easy to rebound, fold, crack and the like. Therefore, with the strong competition of the light weight of the automobiles in the market, the saddle plate needs to have ultrahigh strength and light weight, and a balance point needs to be found between the high strength and the light weight, and meanwhile, the balance point is a difficulty facing the prior art.
Disclosure of Invention
In order to ensure light weight and obtain a saddle plate with ultra-high strength, the application provides an ultra-high strength saddle plate and a manufacturing method thereof.
The application provides an ultrahigh-strength saddle plate and a manufacturing method thereof, which adopts the following technical scheme:
an ultrahigh-strength saddle plate comprises the following raw materials in percentage by mass: 0.15-0.35% of C, 1.0-1.8% of Mn, less than or equal to 0.5% of Si, less than or equal to 0.005% of B, and the balance of iron.
By adopting the technical scheme, the more reasonable Mn element content is adopted, the C element content is matched, and Si and B are added in a compound manner as important alloy elements. C. Mn is a solid solution strengthening element, so that the strength of steel can be improved, the content of Mn element is low, the strength of the steel plate is insufficient, the later forming is not facilitated, the hardenability of Mn element can be improved by reducing the phase transformation driving force, the martensite ratio can be effectively improved, and the strength is obviously improved; the radius of Si atoms is larger than that of Fe, si can be dissolved in austenite in a solid solution mode, obvious strengthening effect is achieved, abrasion resistance can be improved, the reasonable addition amount of B can ensure that hardenability and strength of steel are optional, and the saddle plate comprises the following raw materials in percentage by mass: 0.2 to 0.28 percent of C, 1.3 to 1.5 percent of Mn, 0.3 percent of Si, 0.005 percent of B, 0.0017 to 0.02 percent of Zr, 0.17 to 0.2 percent of Al and ZrB 2 0.004-0.006％，ZrO 2 0.001-0.003% and the balance of iron.
By adopting the technical scheme, the saddle plate is prepared from the raw materials of the components, and in the manufacturing process of the saddle plate, in the stage that austenite grains do not grow greatly, a refined martensitic structure is obtained by quenching, and the saddle plate with high strength and hardness can be obtained by the finer martensitic structure. However, the high temperature causes the austenite grains to become large, and because the growth stage of the austenite grains cannot be precisely controlled, a finer martensite structure cannot be precisely obtained.
The Zr and Al metals are added, so that higher strength and hardenability can be obtained, and the cold deformation plasticity is good. ZrB with high melting point, high hardness, high chemical stability and lower density 2 ，ZrB 2 The fine particles are distributed in the crystal phase to play a role of dispersion strengthening, so that the strength of the material is increased.
By adding proper amount of nano ZrO 2 Particles, fine grain size ZrO 2 The grain boundary is increased by the particles, dislocation movement is blocked and increased when external force acts, and fine ZrO is generated in the quenching stage 2 The particles can prevent the movement of grain boundaries, thereby inhibiting the excessive growth of grains and playing a role in grain refinement. In addition, zrO 2 Can improve the effect of ZrB addition 2 The problem of increased toughness of the plate is caused, and the dual effects of grain refinement and dispersion strengthening lead the saddle plate to have ultrahigh strength.
Optionally, the ZrB 2 The particle size is 20-35nm.
By adopting the technical scheme, zrB is added 2 Particles, zrB, playing the role of ageing strengthening 2 The fine particles are distributed in the crystal phase, the finer the particles are, the more crystal boundaries are generated, the same deformation amount can be dispersed in more crystal boundaries during phase change, and uniform deformation is generated without causing excessive concentration of local stress, so that the strength of the material is improved.
Optionally, the ZrO 2 The particle size is 40-50nm.
By adopting the technical scheme, the ZrO with small particle size 2 The grains increase grain boundaries, and when an external force acts, dislocation movement is hindered and increased, so that excessive growth of grains is restrained, martensite is thinned, and the strength of the saddle plate is increased.
In a second aspect, the present application provides a method for manufacturing an ultrahigh-strength saddle plate, which adopts the following technical scheme:
the manufacturing method of the ultrahigh-strength saddle plate comprises the following steps:
smelting: uniformly stirring and smelting the raw materials in a vacuum induction furnace, and casting into a steel plate;
step two, homogenizing: heating the steel plate to 1100-1150 ℃ in a heating furnace under the protection of inert gas, preserving heat for 1.5-2.5h, cooling to normal temperature in air, eliminating component segregation, rolling into a required material thickness, and cutting into part blanks;
step three, hot stamping forming: and (3) cold stamping the blank obtained in the second step by using a pre-forming die, stamping the blank into the shape of a saddle plate part, heating and preserving heat in a furnace, rapidly moving the saddle plate part into the die for stamping, maintaining pressure, and quenching to obtain the saddle plate.
By adopting the technical scheme, the blank with low strength at normal temperature is heated to austenitizing temperature and kept for a period of time to be austenitized uniformly, then the blank is quickly transferred into a hot forming die with a cooling system inside to be quickly punched and formed, quenching treatment is carried out in the die under certain pressure maintaining, the pressure maintaining and quenching are carried out for a period of time, and an austenite structure is converted into a martensite structure, so that the light saddle plate with ultra-high strength is obtained.
Optionally, the heating temperature in the furnace in the third step is 900-950 ℃, and the heat preservation time is 3-10min.
By adopting the technical scheme, the heating temperature and the heat preservation time are necessary conditions for realizing uniform austenitizing of the blank, the heat preservation time is defined as the soaking time of the blank in the furnace after reaching the specified heating temperature, the length of the heat preservation time can influence whether uniform Oldham tissues can be obtained, the heating temperature is kept above the recrystallization temperature of the blank to ensure austenitizing of the blank, along with the extension of the heat preservation time, the grain size of the Oldham is gradually increased, and then the grain growth trend is slowed down. In order to ensure that uniform and fine austenite grains are obtained, it is necessary to avoid coarse grains caused by long-term heating.
Optionally, the cooling rate of quenching in the third step is 20-30 ℃/s.
By adopting the technical scheme, the hot stamping ensures that the blank is molded in a die at high temperature and also ensures enough quenching cooling rate so as to form a martensitic structure, and the larger the cooling rate of the blank is, the easier the blank is quenched. However, huge quenching stress is easy to generate inside, deformation and cracking are caused, and determining the cooling rate parameters suitable for the hot stamping process is a necessary condition for ensuring the process quality and the final product performance of the hot stamped product.
Optionally, the saddle plate has a final thickness of 1-4mm.
By adopting the technical scheme, the thinner the thickness of the hot stamping product is, the crack expansion energy and tearing strength in unit area are reduced, and the nano ZrO is added 2 And ZrB 2 The particles, in which a large number of dislocations exist during the transformation from austenite to martensite, are hindered by the particles, so that cracks are not easily generated, and high strength is maintained.
In summary, the present application has the following beneficial effects:
1. since the application is made by adding ZrB 2 Nanoparticle having ZrB with high melting point, high hardness, high chemical stability and lower density 2 ，ZrB 2 The fine particles are distributed in the crystal phase to play a role of dispersion strengthening, so that the strength of the material is increased.
2. Addition of nano ZrO in the present application 2 Particles, zrO 2 The grain boundary is increased by the particles, dislocation movement is blocked and increased when external force acts, and fine ZrO is generated in the quenching stage 2 The particles can prevent the movement of grain boundaries, thereby inhibiting the excessive growth of grains and playing a role in grain refinement.
3. According to the method, a blank with low strength at normal temperature is heated to austenitizing temperature and kept for a period of time to enable the blank to be austenitized uniformly, then the blank is quickly transferred into a hot forming die with a cooling system inside to be quickly punched and formed, quenching treatment is carried out in the die under a certain pressure maintaining pressure, the pressure maintaining quenching is carried out for a period of time, and an austenite structure is converted into a martensite structure, so that the saddle plate with ultra-high strength is obtained.
Detailed Description
Embodiment of manufacturing method of ultrahigh-strength saddle plate
Example 1
The manufacturing method of the ultrahigh-strength saddle plate comprises the following steps:
smelting: sequentially adding the components of C, mn, si, B and Fe into a vacuum induction furnace, uniformly stirring and smelting for 50min in the vacuum induction furnace at 1300 ℃, and casting into a steel plate;
step two, homogenizing: heating the steel plate to 1100-1150 ℃ in a heating furnace under the protection of inert gas, preserving heat for 2h, cooling to normal temperature in air, eliminating component segregation, rolling into a required material thickness, and cutting into part blanks;
step three, hot stamping forming: and (3) cold stamping the blank obtained in the second step by using a pre-forming die, stamping the blank into a shape of a saddle plate part, and heating in a furnace at the temperature of 925 ℃ for 5min to fully austenitize the blank. Then rapidly moving into a die to perform stamping, pressure maintaining and quenching, wherein the transfer time is 5s, the stamping pressure is 480T, the holding pressure is 1010T, the holding time is 18s, quenching treatment is performed at a cooling rate of 25 ℃/s, and the saddle plate is taken out after cooling to below 250 ℃ to obtain the saddle plate, and the thickness of the final saddle plate is 3mm.
Example 2
The manufacturing method of the ultrahigh-strength saddle plate comprises the following steps:
smelting: c, mn, si, B, zr, al, zrB 2 ，ZrO 2 Sequentially adding Fe components into a vacuum induction furnace, uniformly stirring and smelting for 50min in the vacuum induction furnace at 1300 ℃, and casting into a steel plate, wherein ZrB 2 ZrO with particle size of 30nm 2 The grain diameter is 45nm;
step two, homogenizing: heating the steel plate to 1100-1150 ℃ in a heating furnace under the protection of inert gas, preserving heat for 2h, cooling to normal temperature in air, eliminating component segregation, rolling into a required material thickness, and cutting into part blanks;
step three, hot stamping forming: and (3) cold stamping the blank obtained in the second step by using a pre-forming die, stamping the blank into a shape of a saddle plate part, and heating in a furnace at the temperature of 925 ℃ for 5min to fully austenitize the blank. Then rapidly moving into a die to perform stamping, pressure maintaining and quenching, wherein the transfer time is 5s, the stamping pressure is 480T, the holding pressure is 1010T, the holding time is 18s, quenching treatment is performed at a cooling rate of 25 ℃/s, and the saddle plate is taken out after cooling to below 250 ℃ to obtain the saddle plate, and the thickness of the final saddle plate is 3mm.
Example 3
The manufacturing method of the ultra-high strength saddle plate is different from that of embodiment 1 in that ZrB 2 ZrO with particle size of 20nm 2 The particle size is 40nm, and the specific steps of the third step are as follows: and (3) cold stamping the blank obtained in the second step by using a pre-forming die, stamping the blank into a shape of a saddle plate part, and heating in a furnace at 900 ℃ for 3min to fully austenitize the blank. Then rapidly moving into a die to perform stamping, pressure maintaining and quenching, wherein the transfer time is 5s, the stamping pressure is 480T, the holding pressure is 1010T, the holding time is 18s, quenching treatment is performed at a cooling rate of 20 ℃/s, and the saddle plate is taken out after cooling to below 250 ℃ to obtain the saddle plate, and the thickness of the final saddle plate is 3mm.
Example 4
The manufacturing method of the ultra-high strength saddle plate is different from that of embodiment 1 in that ZrB 2 Grain diameter of 35nm, zrO 2 The particle size is 50nm, and the specific steps of the third step are as follows: and (3) cold stamping the blank obtained in the second step by using a pre-forming die, stamping the blank into a shape of a saddle plate part, and heating in a furnace at 950 ℃ for 10min to fully austenitize the blank. Then rapidly moving into a die to perform stamping, pressure maintaining and quenching, wherein the transfer time is 5s, the stamping pressure is 480T, the holding pressure is 1010T, the holding time is 18s, quenching treatment is performed at the cooling rate of 30 ℃/s, and the quenching is taken out when the quenching is cooled to below 250 ℃ to obtain a saddleThe thickness of the seat plate is 3mm.
The raw materials of examples 1 to 4 are shown in Table 1 with the respective components and the corresponding parts by mass.
Table 1 Components in examples 1 to 4 and parts by weight (wt%)
| Component (A) | Example 1 | Example 2 | Example 3 | Example 4 |
| C | 0.24 | 0.2 | 0.15 | 0.35 |
| Mn | 1.35 | 1.5 | 1.0 | 1.8 |
| Si | 0.37 | 0.3 | 0.5 | 0.27 |
| B | 0.0031 | 0.002 | 0.005 | 0.003 |
| Zr | — | 0.0019 | 0.0015 | 0.035 |
| Al | — | 0.01 | 0.2 | 0.15 |
| ZrB2 | — | 0.004 | 0.007 | 0.002 |
| ZrO2 | — | 0.002 | 0.001 | 0.004 |
| Fe | 98.0369 | 97.9801 | 98.1355 | 97.386 |
Example 5
UltrahighThe method for manufacturing the strong saddle plate is different from example 3 in that ZrB 2 The particle size was 18nm.
Example 6
The manufacturing method of the ultra-high strength saddle plate is different from example 4 in that ZrB 2 The particle size was 40nm.
Example 7
A method for manufacturing an ultra-high-strength saddle plate is different from example 3 in that ZrO 2 The particle size was 35nm.
Example 8
A method for manufacturing an ultra-high-strength saddle plate is different from example 4 in that ZrO 2 The particle size was 55nm.
Example 9
The manufacturing approach of the saddle plate of the ultra-high strength, different from embodiment 3, in that the heating temperature is 850 deg.C, the holding time is 2min in step three, the concrete step of step three is:
and (3) cold stamping the blank obtained in the second step by using a pre-forming die, stamping the blank into a shape of a saddle plate part, and heating in a furnace at 850 ℃ for 2min to fully austenitize the blank. Then rapidly moving into a die to perform stamping, pressure maintaining and quenching, wherein the transfer time is 5s, the stamping pressure is 480T, the holding pressure is 1010T, the holding time is 18s, quenching treatment is performed at a cooling rate of 20 ℃/s, and the saddle plate is taken out after cooling to below 250 ℃ to obtain the saddle plate, and the thickness of the final saddle plate is 3mm.
Example 10
The manufacturing approach of the saddle plate of the ultra-high strength, different from example 4, in that in step three, the heating temperature is 980 duC, the holding time is 12min, the concrete step of step three is:
and (3) cold stamping the blank obtained in the second step by using a pre-forming die, stamping the blank into a shape of a saddle plate part, and heating in a furnace at 980 ℃ for 12min to fully austenitize the blank. Then rapidly moving into a die to perform stamping, pressure maintaining and quenching, wherein the transfer time is 5s, the stamping pressure is 480T, the holding pressure is 1010T, the holding time is 18s, quenching treatment is performed at a cooling rate of 30 ℃/s, and the saddle plate is taken out after cooling to below 250 ℃ to obtain the saddle plate, and the thickness of the final saddle plate is 3mm.
Example 11
The manufacturing approach of the saddle plate of the ultra-high strength, different from example 3, the cooling rate of quenching of step three is 15 ℃/s, the concrete step of step three is:
and (3) cold stamping the blank obtained in the second step by using a pre-forming die, stamping the blank into a shape of a saddle plate part, and heating in a furnace at 900 ℃ for 3min to fully austenitize the blank. Then rapidly moving into a die to perform stamping, pressure maintaining and quenching, wherein the transfer time is 5s, the stamping pressure is 480T, the holding pressure is 1010T, the holding time is 18s, quenching treatment is performed at a cooling rate of 15 ℃/s, and the saddle plate is taken out after cooling to below 250 ℃ to obtain the saddle plate, and the thickness of the final saddle plate is 3mm.
Example 12
The manufacturing approach of the saddle plate of the ultra-high strength, different from example 4, wherein the cooling rate of quenching in step three is 35 ℃/s, the concrete step of step three is:
and (3) cold stamping the blank obtained in the second step by using a pre-forming die, stamping the blank into a shape of a saddle plate part, and heating in a furnace at 950 ℃ for 10min to fully austenitize the blank. Then rapidly moving into a die to perform stamping, pressure maintaining and quenching, wherein the transfer time is 5s, the stamping pressure is 480T, the holding pressure is 1010T, the holding time is 18s, quenching treatment is performed at a cooling rate of 35 ℃/s, and the saddle plate is taken out after cooling to below 250 ℃ to obtain the saddle plate, and the thickness of the final saddle plate is 3mm.
Comparative example
Comparative example 1
A manufacturing method of an ultra-high strength saddle plate is different from example 2 in that the raw material does not include ZrB 2 The specific steps of the first step are as follows:
smelting: will beSequentially adding the components of C, mn, si, B, zr, al, zrO2 and Fe into a vacuum induction furnace, uniformly stirring and smelting for 50min in the vacuum induction furnace at 1300 ℃, and casting into a steel plate, wherein ZrO 2 The particle size was 45nm.
Comparative example 2
A method for manufacturing an ultra-high-strength saddle plate is different from example 2 in that the raw material does not include ZrO 2 The specific steps of the first step are as follows:
smelting: sequentially adding the components of C, mn, si, B, zr, al, zrB2 and Fe into a vacuum induction furnace, uniformly stirring and smelting for 50min in the vacuum induction furnace at 1300 ℃, and casting into a steel plate, wherein ZrB 2 The particle size was 30nm.
Comparative example 3
A method for manufacturing an ultra-high-strength saddle plate is different from example 2 in that the raw material does not include ZrO 2 And ZrB 2 The specific steps of the first step are as follows:
smelting: sequentially adding the components of C, mn, si, B, zr, al and Fe into a vacuum induction furnace, uniformly stirring and smelting for 50min in the vacuum induction furnace at 1300 ℃, and casting into a steel plate.
Performance test
Experimental samples: performance tests were performed using the saddle plate samples prepared in examples 1-12 and comparative examples 1-3.
The experimental method comprises the following steps: tensile strength (MPa), yield strength (MPa) and elongation (%) were tested according to GB/T228.1-2010 Metal Material tensile test.
TABLE 2 Performance test results
| Tensile Strength (MPa) | Yield strength (MPa) | Elongation (%) | |
| Example 1 | 1200 | 1000 | 6 |
| Example 2 | 1800 | 1300 | 8 |
| Example 3 | 1600 | 1200 | 7 |
| Example 4 | 1400 | 1100 | 6 |
| Example 5 | 1100 | 900 | 5 |
| Example 6 | 1050 | 850 | 6 |
| Example 7 | 1386 | 800 | 6 |
| Example 8 | 1000 | 840 | 4 |
| Example 9 | 970 | 610 | 4 |
| Example 10 | 951 | 790 | 5 |
| Example 11 | 896 | 680 | 5 |
| Example 12 | 854 | 600 | 4 |
| Comparative example 1 | 1100 | 980 | 5 |
| Comparative example 2 | 1090 | 990 | 6 |
| Comparative example 3 | 900 | 1000 | 5 |
As can be seen from the combination of examples 3-4 and examples 5-6 and the combination of Table 2, examples 3-4 are superior to examples 5-6 in performance, demonstrating ZrB 2 The particles are distributed in the grain boundary, so that the blocking effect of the motion dislocation can be effectively increased, and the strength and the elongation are improved, but the smaller particle size is easy to agglomerate in the grain boundary, and the strength is influenced.
As can be seen from the combination of examples 3 to 4 and examples 7 to 8 and the combination of Table 2, examples 3 to 4 are superior in performance to examples 7 to 8 in terms of fine grain size ZrO 2 The grain boundary is increased by the particles, dislocation movement is hindered and is refined when external force acts, so that the strength of the steel is increased, but ZrO with smaller grain size 2 The particles are agglomerated at the grain boundary to enable the grains to excessively grow up and not play a role in grain refinement, so that the strength is reduced.
It can be seen from the combination of examples 3-4 and examples 9-10 and the combination of table 2 that the performance of examples 3-4 is superior to examples 9-10, the heating temperature is low, the holding time is short, it is difficult to obtain uniform and simple structure, the heating temperature should be kept above the recrystallization temperature of the blank to ensure austenitizing of the blank, the holding time is prolonged, the grain size of the simple structure is gradually increased, the grain refinement effect cannot be achieved, and the performance is reduced.
In combination with examples 3-4 and examples 11-12, and in combination with Table 2, it can be seen that examples 3-4 are superior to examples 11-12 in terms of performance, the quench cooling rate is too low to form a martensitic structure, and the greater the quench cooling rate of the billet, the more easily quench hardened the billet, resulting in increased brittleness.
As can be seen from the combination of examples 2 and comparative examples 1-3 and Table 2, examples 2-4 perform better than comparative examples 1-3 by adding ZrB 2 The particles play a role in ageing strengthening, and ZrO 2 The particles play a role in refining grains, and ZrO 2 Can be improved due to the addition of ZrB 2 The problem of increased toughness of the blank is caused, and the dual effects of grain refinement and dispersion strengthening lead the saddle plate to have ultrahigh strength.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.
Claims (2)
1. A manufacturing method of an ultrahigh-strength saddle plate is characterized in that: the saddle plate comprises the following raw materials in percentage by mass: 0.2 to 0.28 percent of C, 1.3 to 1.5 percent of Mn, 0.3 percent of Si, 0.005 percent of B, 0.0017 to 0.02 percent of Zr, 0.17 to 0.2 percent of Al and ZrB 2 0.004-0.006%，ZrO 2 0.001-0.003% and the balance of iron; the ZrB 2 The grain diameter is 20-35nm; the ZrO 2 The grain diameter is 40-50nm;
the manufacturing method of the ultrahigh-strength saddle plate comprises the following steps:
smelting: uniformly stirring and smelting the raw materials in a vacuum induction furnace, and casting into a steel plate;
step two, homogenizing: heating the steel plate to 1100-1150 ℃ in a heating furnace under the protection of inert gas, preserving heat for 1.5-2.5h, cooling to normal temperature in air, eliminating component segregation, rolling into a required material thickness, and cutting into part blanks;
step three, hot stamping forming: firstly, cold stamping the blank obtained in the second step by using a preformed die, firstly stamping the blank into the shape of a saddle plate part, then heating and preserving heat in a furnace, then rapidly moving the saddle plate part into the die for stamping, maintaining pressure, and quenching to obtain a saddle plate;
the heating temperature in the furnace in the step three is 900-950 ℃, and the heat preservation time is 3-10min;
and in the third step, the cooling rate of quenching is 20-30 ℃/s.
2. The method for manufacturing an ultra-high strength saddle plate according to claim 1, wherein: the saddle plate has a thickness of 1-4mm.
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| CN202211531747.0A CN115821167B (en) | 2022-12-01 | 2022-12-01 | Ultrahigh-strength saddle plate and manufacturing method thereof |
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| CN202211531747.0A CN115821167B (en) | 2022-12-01 | 2022-12-01 | Ultrahigh-strength saddle plate and manufacturing method thereof |
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| JP2011101889A (en) * | 2009-11-10 | 2011-05-26 | Sumitomo Metal Ind Ltd | Hot-press formed component and method for manufacturing the same |
| WO2013094475A1 (en) * | 2011-12-19 | 2013-06-27 | 株式会社神戸製鋼所 | Steel for mechanical structure for cold working, and method for manufacturing same |
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| CN114150227A (en) * | 2021-12-07 | 2022-03-08 | 武汉科技大学 | High-toughness hot stamping steel rolled by medium and thin slabs with Rm more than or equal to 1500MPa and production method |
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| JP2011101889A (en) * | 2009-11-10 | 2011-05-26 | Sumitomo Metal Ind Ltd | Hot-press formed component and method for manufacturing the same |
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