CN115475832A - Production process for improving bending property of Al-Si coating hot forming steel through cold rolling - Google Patents
Production process for improving bending property of Al-Si coating hot forming steel through cold rolling Download PDFInfo
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- 239000011248 coating agent Substances 0.000 title claims abstract description 108
- 238000000576 coating method Methods 0.000 title claims abstract description 108
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 106
- 239000010959 steel Substances 0.000 title claims abstract description 106
- 238000005097 cold rolling Methods 0.000 title claims abstract description 62
- 238000005452 bending Methods 0.000 title claims abstract description 55
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 47
- 229910018125 Al-Si Inorganic materials 0.000 title claims abstract description 29
- 229910018520 Al—Si Inorganic materials 0.000 title claims abstract description 29
- 239000010410 layer Substances 0.000 claims abstract description 149
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims abstract description 132
- 239000002356 single layer Substances 0.000 claims abstract description 64
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 238000007747 plating Methods 0.000 claims description 50
- 238000000034 method Methods 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 24
- 229910000765 intermetallic Inorganic materials 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 21
- 238000010791 quenching Methods 0.000 claims description 15
- 230000000171 quenching effect Effects 0.000 claims description 15
- 230000009467 reduction Effects 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000000839 emulsion Substances 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 30
- 238000005096 rolling process Methods 0.000 description 13
- 239000000758 substrate Substances 0.000 description 11
- 238000009826 distribution Methods 0.000 description 8
- 229910015372 FeAl Inorganic materials 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/221—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by cold-rolling
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- Mechanical Engineering (AREA)
- Coating With Molten Metal (AREA)
Abstract
The invention provides a production process for improving the bending property of Al-Si coating hot forming steel by cold rolling, which comprises the following steps: after the steel coil of the double-layer aluminum-silicon coating raw material steel is uncoiled, a single-layer aluminum-silicon coating steel coil is obtained in a cold rolling mode, and the steel coil is straightened into a flat single-layer aluminum-silicon coating steel plate for subsequent hot stamping production. The process for preparing the aluminum-silicon plated steel plate with the single-layer structure by the cold rolling mode improves the bending property of the aluminum-silicon plated steel plate after hot stamping, and has simple and efficient production process.
Description
Technical Field
The invention belongs to the technical field of material production processes, and particularly relates to a production process for improving the bending property of Al-Si coating hot forming steel by cold rolling.
Background
The aluminum-silicon coating can produce continuous, uniform and compact protective films such as aluminum oxide and the like on the surface under a high-temperature oxidation environment, so that the hot-formed steel (mainly 22MnB 5) with the hot-dip aluminum-silicon coating does not need gas protection in the austenitizing heating process, does not generate iron scale, omits shot blasting treatment, improves the processing environment, prolongs the service life of a die, enhances the dimensional precision, and is popular with automobile host factories.
The existing aluminum-silicon coated steel plate is prepared by immersing a bare plate into molten Al-Si metal liquid (by weight percentage, 8-11% Si,2-4% of Fe, the balance being Al and unavoidable impurities) to coat the surface with an Al-si plating layer. In the process, a double-layer structure with an upper aluminum silicon layer and a lower intermetallic compound layer distributed on the surface of the steel substrate is generated. During the austenitizing treatment process of hot stamping, the aluminum-silicon coating can be diffused with the steel matrix to generate FeAl and Fe 2 Al 5 And alpha-Fe; fe 2 Al 5 Is a brittle and hard phase, can reduce the bending property of the hot stamped sheet material and the collision safety of parts, and is Fe 2 Al 5 The brittle-hard phase ratio is large, and the bending property is poor.
The coating structure of the conventional aluminum-silicon coated steel plate is a double-layer structure, and the structure is not beneficial to the diffusion of Al and Fe in austenitizing treatment, so that Fe is caused 2 Al 5 The brittle-hard phase ratio is large, and the bending performance is poor. Therefore, how to prepare the aluminum-silicon coated steel plate with the single-layer structure distribution can reduce Fe after hot stamping production 2 Al 5 The generation of phases to improve the bending performance of the sheet after hot stamping is a problem to be solved at present. .
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a production process for improving the bending property of Al-Si coating hot forming steel by cold rolling, and provides a process for preparing a single-layer structure aluminum-silicon coating steel plate by a cold rolling mode, so that the bending property of the aluminum-silicon coating steel plate after hot stamping is improved, and the production process is simple and efficient.
The technical scheme adopted by the invention for solving the technical problem is as follows: a production process for improving the bending property of Al-Si coating hot forming steel by cold rolling comprises the following steps: and uncoiling the steel coil of the double-layer aluminum-silicon coating raw material steel, obtaining a single-layer aluminum-silicon coating steel coil in a cold rolling mode, straightening the steel coil into a flat single-layer aluminum-silicon coating steel plate, and further using the flat single-layer aluminum-silicon coating steel plate for subsequent hot stamping production.
Further, the hot stamping process parameters in the hot stamping production are as follows: heating at 920-930 ℃ for 180-300s.
Further, the hot stamping production also comprises the step of immediately quenching and cooling after the hot stamping production, wherein the cooling speed is more than or equal to 30 ℃/s.
Furthermore, the plating layer of the double-layer aluminum-silicon plating layer raw material steel is of a vertically distributed structure, the upper layer is an aluminum-silicon layer, and the lower layer is an intermetallic compound layer; the single-layer aluminum-silicon coating with the aluminum-silicon layer and the intermetallic compound layer distributed in a left-right staggered manner is formed after cold rolling.
Furthermore, after the single-layer aluminum-silicon coating steel plate is produced by hot stamping, fe 2 Al 5 The phase area ratio is 0.2% -1.9% of the whole area of the plating.
Furthermore, after the single-layer aluminum-silicon plated steel plate is produced through hot stamping, the bending angle is improved by 33% -45%.
Furthermore, the cold rolling passes are 1~3, and the total cold rolling reduction rate is 30-70%.
Furthermore, in order to ensure that the aluminum-silicon coating can form a single-layer structure after cold rolling and the aluminum-silicon coating is perfect and continuous, has no crack and no fall off after cold rolling, the hardness of the working roll for cold rolling is 94-100HSD, and the surface roughness is within Ra 5.0 mu m.
Further, the concentration of the emulsion for cold rolling is 1.5 to 3.0 percent; the cold rolling tensile stress is controlled to be (0.1-0.5) sigma s 。
Furthermore, the method is suitable for the hot forming steel with the thickness of the aluminum-silicon coating layer being less than or equal to 15 mu m.
Further, the method is suitable for AS20/20 double-layer aluminum-silicon coating hot forming steel.
The double-layer aluminum-silicon coating raw material steel coating has a two-layer structure, an aluminum-silicon layer and an intermetallic compound layer, and is a structure in an up-and-down distribution mode. In the cold rolling process, the intermetallic compound layer has the largest hardness and low plasticity, the aluminum silicon layer and the steel substrate have small hardness and relatively good plasticity, so that the aluminum silicon layer and the steel substrate are subjected to cold rolling reduction in the cold rolling process to be reduced in thickness and extend along the rolling direction, the thickness of the intermetallic compound layer is basically unchanged, but the intermetallic compound layer participates in the deformation process in a crushing mode due to pressure, the crushed parts are distributed along with the aluminum silicon layer and the steel substrate in an extending mode along the rolling direction, namely the aluminum silicon layer, the intermetallic compound layer and the steel substrate all participate in deformation in the cold rolling deformation process, the aluminum silicon layer and the steel substrate participate in deformation in the thickness reduction mode, and the intermetallic compound layer participates in deformation in the crushing mode. When the cold rolling reduction is less than 30%, the intermetallic compound layer is small in fracture cracks, and as the cold rolling reduction increases, the crack density increases and the cracks propagate in the transverse direction so that the crack width increases. When the cold rolling reduction rate is 30%, the intermetallic compound layer is large in broken crack and large in crack opening, the aluminum silicon layer is completely filled into the crack due to the fact that the aluminum silicon layer is minimum in hardness and bears pressure, the plating layer structure is changed from a vertically distributed double-layer structure of the aluminum silicon layer and the intermetallic compound layer into a horizontally distributed single-layer structure of the (aluminum silicon and the intermetallic compound) layer, and the single aluminum silicon layer does not exist basically. When the cold rolling reduction rate is more than 30%, the aluminum-silicon coating structure does not change because no single aluminum-silicon layer exists, and a single-layer structure of the left and right distribution of the (aluminum-silicon + intermetallic compound) layer is maintained.
In the heating process of the double-layer structure coating in hot stamping, fe element in the steel matrix diffuses to the most superficial aluminum silicon layer through the intermetallic compound layer, al element in the aluminum silicon layer diffuses to the steel matrix through the intermetallic compound layer, and the diffusion efficiency is low, so that the Fe element content in the aluminum silicon layer is low, the Al element content is high, and the Fe element is promoted to be formed 2 Al 5 A brittle and hard phase. In the heating process of hot stamping of the single-layer structure coating, the area of direct contact between the steel substrate and the aluminum-silicon layer is greatly increased, fe element in the steel substrate can be directly diffused to the aluminum-silicon layer at the position of direct contact between the steel substrate and the aluminum-silicon layer, al element in the aluminum-silicon layer can be directly diffused to the steel substrate, the diffusion efficiency is high and sufficient, so that the content of Fe element in the aluminum-silicon layer is high, the content of Al element is low, and the Fe element content is promoted 2 Al 5 Transformation of brittle hard phase to FeAl tough phase.
Compared with the prior art, the invention has the beneficial effects that:
the invention can prepare the single-layer structure aluminum-silicon coating steel plate product at one time by a cold rolling and rolling mode, and has simple working procedure and strong adaptability; the steel plate with the single-layer aluminum-silicon coating has the advantages that the bending performance after hot stamping is obviously improved, and the collision safety of parts is improved. Compared with the double-layer aluminum-silicon plating layer, the functions of the plating layer adhesion force, the plating layer adhesion failure type and the like after the single-layer aluminum-silicon plating layer is subjected to hot pressing are not weakened, the plating layer adhesion force is 21-22MPa, the plating layer adhesion failure type is adhesion failure AF, namely, the visual failure phenomenon occurs at the interface of an adhesive and an adherend, and the plating layer is not damaged. When the single-layer plating layer is subjected to hot stamping, compared with the conventional double-layer aluminum-silicon plating layer, the heating temperature can be reduced or the heat preservation time can be shortened, and the energy consumption is reduced.
Drawings
FIG. 1 is a cold rolling preparation diagram of a single-layer aluminum-silicon coating steel coil;
FIG. 2 is a striping diagram of a single-layer aluminum-silicon-plated steel coil;
FIG. 3 is a drawing showing the preparation of a single-layer Al-Si plated steel sheet;
FIG. 4 is a scanning electron microscope image of the structure of the AS20/20 double-layer Al-Si plating layer of example 2 before hot stamping;
FIG. 5 is a scanning electron micrograph of the structure of the single-layer Al-Si plating layer of example 2 before hot stamping;
FIG. 6 is a sectional view of Al element before hot stamping of the AS20/20 double-layered Al-Si plating layer of example 2;
FIG. 7 is a sectional view of the Al element of the single-layer Al-Si plating layer of example 2 before hot stamping;
FIG. 8 is a sectional view of Al element after hot stamping of the AS20/20 double-layered Al-Si plating layer of example 2;
fig. 9 is a sectional view of Al element after hot stamping of the single-layer Al-si plating layer of example 2.
Reference numerals: 1-double-layer aluminum-silicon coating raw material steel coil; 2-rolling mill; 3-a single-layer aluminum-silicon coating steel coil; 4-slitting machine; 5-straightening machine; 6, shearing machine; 7-single-layer aluminum-silicon coating steel plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The production process for improving the bending property of Al-Si coating thermoformed steel by cold rolling is shown in figures 1-3, a steel coil 1 of conventional double-layer aluminum-silicon coating raw material steel is uncoiled and then enters a rolling mill 2, the steel coil is rolled down by the cold rolling of the rolling mill, a single-layer aluminum-silicon coating steel coil 3 is obtained after coiling, the single-layer aluminum-silicon coating steel coil is split by a splitting machine 4 to obtain a coil material with required width (the splitting is carried out according to the width requirement, if the splitting is not required, the step is not carried out), the single-layer aluminum-silicon coating steel coil is straightened by a straightening machine 5, and the single-layer aluminum-silicon coating steel coil is cut into single-layer coating steel plates 7 with different sizes by an aluminum-silicon shearing machine 6 and then used for subsequent hot stamping production.
Wherein, the hot stamping parameters in the hot stamping production are as follows: heating at 920-930 ℃ for 180-300s; the hot stamping production also comprises the step of immediately quenching and cooling after the hot stamping production, wherein the cooling speed is more than or equal to 30 ℃/s.
Wherein, the rolling passes are 1 to 3 times, and the total cold rolling reduction rate is 30 to 70 percent; meanwhile, in order to ensure that the aluminum-silicon coating can form a single-layer structure after cold rolling and the aluminum-silicon coating is perfect, continuous, crack-free and shedding-free after cold rolling, the hardness of the working roll for cold rolling is 94-100HSD, and the surface roughness is within Ra 5.0 mu m. The concentration of the emulsion for cold rolling is 1.5 to 3.0 percent; the cold rolling tensile stress is controlled to be (0.1-0.5) sigma s (ii) a Because the hardness of the aluminum-silicon coating is low, foreign matter blocking of the guide wheel cannot exist in the rolling process so as to avoid damaging the coating. And then straightening the steel coil into a single-layer structure aluminum-silicon coated steel plate for subsequent hot stamping production.
The specific technological parameters of cold rolling, hot stamping and quenching cooling are shown in each embodiment. In each embodiment, the raw material steel of the double-layer aluminum-silicon coating is AS20/20, the total thickness of the aluminum-silicon coating is 11-14 mu m, the AS20/20 aluminum-silicon coating has two layers, and the aluminum-silicon layer and the intermetallic compound layer are in a structure in an up-and-down distribution mode; the aluminum-silicon layer comprises 1-2 wt% of Si and the balance of Al; the intermetallic compound layers, from the steel substrate to the Al-Si layer, were each Fe with a thickness of about 1 μm 2 Al 5 、FeAl 3 And Fe with a thickness of about 5 μm 2 SiAl 7 。
Example 1
Rolling the double-layer aluminum-silicon coating raw material steel AS20/20 for 1 pass, and obtaining a single-layer aluminum-silicon coating steel plate, wherein the total cold rolling reduction rate is 30%; the hot stamping parameters are as follows: heating at 930 deg.C for 300s, quenching and cooling at 50 deg.C/s;
the double-layer aluminum-silicon coating AS20/20 raw material steel plate is processed by the same hot stamping, quenching and cooling processes.
The two steel plates are processed by hot stamping, quenching and cooling processes, and Fe in the two steel plates 2 Al 5 The percentage of the phase area to the total area of the plating layer and the bending property parameters are shown in Table 1, and Fe formed after the hot stamping production of the AS20/20 double-layer aluminum-silicon plating layer is distributed up and down 2 Al 5 The phase area content accounts for 15.3 percent of the whole plating layer, and Fe is formed after the single-layer aluminum-silicon plating layer which is distributed left and right is produced by hot stamping 2 Al 5 Phase content 1.9% of the entire coating, fe 2 Al 5 The brittle and hard phases are greatly reduced. According to the test requirements of VDA 238-100 of the bending test standard, the plate after hot stamping production is subjected to a bending test to obtain the bending angles of the AS20/20 double-layer aluminum-silicon coating plate and the single-layer aluminum-silicon coating plate, and the results in the table 1 show that the bending angle after the single-layer structure aluminum-silicon coating is subjected to hot stamping production is larger than that after the double-layer structure aluminum-silicon coating is subjected to hot stamping production, and the bending angle is improved by 33.3 percent.
Example 2
Rolling for 2 times, wherein the total cold rolling reduction rate is 50%, and obtaining a single-layer aluminum-silicon coating steel plate; the hot stamping parameters are as follows: heating at 925 deg.C, holding for 240s, and cooling at 60 deg.C/s.
The double-layer aluminum-silicon plating layer AS20/20 raw material steel plate is processed by the same hot stamping, quenching and cooling processes.
The two steel plates are processed by hot stamping, quenching and cooling processes, and Fe in the two steel plates 2 Al 5 The percentage of the phase area to the total area of the plating layer and the bending performance parameters are shown in Table 2, and Fe formed after the AS20/20 upper and lower distribution double-layer aluminum-silicon plating layer hot stamping production 2 Al 5 The phase area content accounts for 15.7 percent of the whole plating layer, and Fe formed after the single-layer aluminum-silicon plating layer is distributed left and right and is produced by hot stamping 2 Al 5 The phase content is 0.6% of the whole plating layer. According to the test requirements of a bending test standard VDA 238-100, performing a bending test on the plate after hot stamping production to obtain an AS20/20 double-layer aluminum-silicon plated plate and a single-layer aluminum-silicon plated plateThe results in table 2 show that the bending angle of the single-layer aluminum-silicon coating after hot stamping is greater than that of the double-layer aluminum-silicon coating, and the bending angle is increased by 41.8%.
Fig. 4 is a scanning electron microscope image of the AS20/20 double-layer aluminum-silicon coating structure, fig. 6 is an Al element surface scanning image of the AS20/20 double-layer aluminum-silicon coating structure, and AS can be seen from fig. 4 and fig. 6, before the AS20/20 coating is cold-rolled, the coating is a double-layer structure distributed up and down, the upper layer is an aluminum-silicon layer, and the lower layer is an intermetallic compound layer. Fig. 5 is a scanning electron microscope image of a single-layer aluminum-silicon coating structure after cold rolling for 50%, fig. 7 is an Al element surface scanning image of the single-layer aluminum-silicon coating structure after cold rolling for 50%, and AS can be seen from fig. 5 and fig. 7, after the AS20/20 coating is cold rolled for 50%, the coating structure is changed and is a single-layer structure distributed from left to right, an aluminum-silicon layer and an intermetallic compound layer are distributed in a cross mode, and the coating is continuous without peeling and cracking. FIG. 8 is a sectional view of Al element in the AS20/20 double-layer Al-Si plating layer structure after the heat is preserved at 925 ℃ for 240s and then the plate is immediately cooled and hot-stamped, and Fe is shown in the drawing 2 Al 5 The phase accounts for 15.7% of the total coating area. FIG. 9 is a sectional view showing the Al element produced by cold rolling a 50% single-layer Al-Si plating layer, immediately cooling the single-layer Al-Si plating layer after the heat preservation at 925 ℃ for 240 seconds, and hot stamping, from which Fe is shown 2 Al 5 The phase ratio is 0.6% of the whole coating area, and the ratio is greatly reduced.
Example 3
Rolling for 3 times, wherein the total cold rolling reduction rate is 70%, and obtaining a single-layer aluminum-silicon coating steel plate; the hot stamping process parameters are as follows: heating at 920 deg.C for 180s, cooling at 70 deg.C/s.
The double-layer aluminum-silicon plating layer AS20/20 raw material steel plate is processed by the same hot stamping, quenching and cooling processes.
The two steel plates are processed by hot stamping, quenching and cooling processes, and Fe in the two steel plates 2 Al 5 The percentage of the phase area to the total area of the plating layer and the bending property parameters are shown in Table 3, and the AS20/20 upper and lower distribution double-layer aluminum-silicon plating layerFe formed after hot stamping production 2 Al 5 The phase content accounts for 15.5 percent of the whole plating layer, and Fe formed after the single-layer aluminum-silicon plating layer is distributed left and right and is produced by hot stamping 2 Al 5 The phase content is 0.2% of the whole plating layer. According to the test requirements of the bending test standard VDA 238-100, the bending test is carried out on the plate after hot stamping to obtain the bending angles of the AS20/20 double-layer aluminum-silicon coating plate and the single-layer aluminum-silicon coating plate, and the results in the table 3 show that the bending angle after the single-layer structure aluminum-silicon coating is produced by hot stamping is larger than that after the double-layer structure aluminum-silicon coating is produced by hot stamping, and the bending angle is improved by 45.5%.
Example 4
Rolling for 2 times, wherein the total cold rolling reduction rate is 40%, and obtaining a single-layer aluminum-silicon coating steel plate; the hot stamping process parameters are as follows: heating at 925 deg.C for 270s, and cooling at 55 deg.C/s.
The double-layer aluminum-silicon plating layer AS20/20 raw material steel plate is processed by the same hot stamping, quenching and cooling processes.
The two steel plates are processed by hot stamping, quenching and cooling processes, and Fe in the two steel plates 2 Al 5 The percentage of the phase area to the total area of the plating layer and the bending performance parameters are shown in Table 4, and Fe formed after the AS20/20 upper and lower distribution double-layer aluminum-silicon plating layer hot stamping production 2 Al 5 The phase content accounts for 15.4 percent of the whole plating layer, and Fe formed after the single-layer aluminum-silicon plating layer is distributed left and right and is produced by hot stamping 2 Al 5 The phase content accounts for 1.3% of the total coating. According to the test requirements of the bending test standard VDA 238-100, the bending test is carried out on the plate after the hot stamping production to obtain the bending angles of the AS20/20 double-layer aluminum-silicon coating plate and the single-layer aluminum-silicon coating plate, and the results in the table 4 show that the bending angle after the single-layer aluminum-silicon coating is produced by hot stamping is larger than that after the double-layer aluminum-silicon coating is produced by hot stamping, and the bending angle is improved by 37.0%.
Example 5
Rolling for 3 times, wherein the total cold rolling reduction rate is 60%, and obtaining a single-layer aluminum-silicon coating steel plate; the hot stamping process parameters are as follows: heating to 920 ℃, keeping the temperature for 210s, and then immediately cooling at a cooling speed of 65 ℃/s.
The double-layer aluminum-silicon coating AS20/20 raw material steel plate is processed by the same hot stamping, quenching and cooling processes.
The two steel plates are processed by hot stamping, quenching and cooling processes, and Fe in the two steel plates 2 Al 5 The percentage of the phase area to the total area of the plating layer and the bending performance parameters are shown in Table 5, and Fe formed after the AS20/20 upper and lower distribution double-layer aluminum-silicon plating layer hot stamping production 2 Al 5 The phase content accounts for 15.5 percent of the whole plating layer, and Fe formed after the single-layer aluminum-silicon plating layer is distributed left and right and is produced by hot stamping 2 Al 5 The phase content accounts for 0.3 percent of the whole plating layer. According to the test requirements of the bending test standard VDA 238-100, the bending test is carried out on the plate after hot stamping to obtain the bending angles of the AS20/20 double-layer aluminum-silicon coating plate and the single-layer aluminum-silicon coating plate, and the results in the table 5 show that the bending angle of the single-layer aluminum-silicon coating after hot stamping is larger than that of the double-layer aluminum-silicon coating after hot stamping, and the bending angle is improved by 44.4%.
The technical idea of the present invention is described in the above technical solutions, and the protection scope of the present invention is not limited thereto, and any changes and modifications made to the above technical solutions according to the technical essence of the present invention belong to the protection scope of the technical solutions of the present invention.
Claims (10)
1. A production process for improving the bending property of Al-Si coating hot forming steel by cold rolling is characterized by comprising the following steps: after the steel coil of the double-layer aluminum-silicon coating raw material steel is uncoiled, a single-layer aluminum-silicon coating steel coil is obtained in a cold rolling mode, and the steel coil is straightened into a flat single-layer aluminum-silicon coating steel plate for subsequent hot stamping production.
2. The production process for improving the bending property of Al-Si coating hot forming steel by cold rolling according to claim 1, wherein the hot stamping process parameters in the hot stamping production are as follows: heating at 920-930 ℃ for 180-300s.
3. The production process for improving the bending property of Al-Si coating hot forming steel by cold rolling according to claim 1, wherein the hot stamping production further comprises quenching and cooling immediately after the hot stamping production, and the cooling speed is more than or equal to 30 ℃/s.
4. The production process for improving the bending property of Al-Si coating hot forming steel by cold rolling according to claim 1, wherein the coating of the double-layer aluminum-silicon coating raw steel is of a vertically distributed structure, the upper layer is an aluminum-silicon layer, and the lower layer is an intermetallic compound layer; the single-layer aluminum-silicon coating with the aluminum-silicon layer and the intermetallic compound layer distributed in a left-right staggered manner is formed after cold rolling.
5. The production process for improving the bending property of the Al-Si coating hot forming steel by cold rolling according to claim 1, wherein after the single-layer aluminum-silicon coating steel plate is produced by hot stamping, fe 2 Al 5 The phase area ratio is 0.2% -1.9% of the whole area of the plating.
6. The production process for improving the bending property of the Al-Si coating hot forming steel in the cold rolling mode according to claim 1, wherein after the single-layer aluminum-silicon coating steel plate is produced through hot stamping, the bending angle is improved by 33% -45%.
7. The production process for improving the bending property of the Al-Si coating hot forming steel by cold rolling according to claim 1, wherein the cold rolling passes are 1~3, and the total cold rolling reduction rate is 30% -70%.
8. The production process for improving the bending property of Al-Si coating hot forming steel by cold rolling according to claim 1, wherein the working roll hardness for cold rolling is 94-100HSD, and the surface roughness is within Ra 5.0 μm; the concentration of the emulsion for cold rolling is 1.5 to 3.0 percent; the cold rolling tensile stress is controlled to be (0.1-0.5) sigma s 。
9. The production process for improving the bending property of Al-Si coating hot forming steel by cold rolling according to claim 1, wherein the method is suitable for hot forming steel with an Al-Si coating thickness less than or equal to 15 μm.
10. The production process for improving the bending property of Al-Si coating hot forming steel by cold rolling according to claim 1, wherein the method is suitable for AS20/20 double-layer aluminum-silicon coating hot forming steel.
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