CN112281062A - 1000 MPa-grade low-cost hot-galvanized dual-phase steel and preparation method thereof - Google Patents
1000 MPa-grade low-cost hot-galvanized dual-phase steel and preparation method thereof Download PDFInfo
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Abstract
本发明公开了一种1000MPa级低成本热镀锌双相钢及其制备方法，该热镀锌双相钢制备时，冶炼的铸坯合金元素少，未加入贵重元素Mo，仍能保证钢的淬透性，易于炼钢生产，降低原料消耗，有利于企业降低生产成本，且充分利用热镀锌机组的预氧化设备，实现含Si双相钢的可镀性，提高产品表面质量，通过镀后快速冷却实现1000MPa强度要求，具有生产控制相对简单，工艺参数易于实现，表面质量良好，综合力学性能优异，较好地满足产品相关要求等优点。
The invention discloses a 1000MPa grade low-cost hot-dip galvanized dual-phase steel and a preparation method thereof. When the hot-dip galvanized dual-phase steel is prepared, the smelted billet has few alloy elements, and the precious element Mo is not added, which can still ensure the quality of the steel. Hardenability, easy to make steel production, reduce raw material consumption, help enterprises to reduce production costs, and make full use of the pre-oxidation equipment of the hot-dip galvanizing unit to achieve the platability of Si-containing dual-phase steel, improve product surface quality, The post-rapid cooling achieves the 1000MPa strength requirement, and has the advantages of relatively simple production control, easy realization of process parameters, good surface quality, excellent comprehensive mechanical properties, and better product-related requirements.
Description
Technical Field
The invention relates to the technical field of steelmaking, in particular to 1000 MPa-level low-cost hot-galvanized dual-phase steel and a preparation method thereof.
Background
Since 2000, the automotive industry in China has developed very rapidly, growing rapidly at two-digit rates each year. The automobile output in China increases year by year, and the automobile keeping quantity also increases greatly. The continuous rising of the automobile output and the increase of the automobile holding capacity bring the revolution to the society and simultaneously cause three social problems: fuel consumption, emissions and safety. The effective measure for reducing fuel consumption and emission is the light weight of the automobile, and a large number of experimental results show that: the dead weight of the passenger car is reduced by 10 percent, and the oil consumption is reduced by 6 to 8 percent. The system experiment of the full-forward vehicle shows that: under the emission condition meeting the Europe IV standard, the self weight and the oil consumption of the automobile are in a linear relationship. However, the weight reduction and the automobile safety are contradictory, the method for reducing the weight and ensuring the automobile safety is to apply various advanced high-strength materials, and the high-strength material with the most economic value is still advanced high-strength steel and has incomparable inherent advantages compared with other materials.
Many enterprises and automobile companies are developing automobile lightweight cooperative projects, different weight reduction targets are set for different automobile types, cost is not increased, and collision safety regulations are met. The individual project aims enable the automobile body-in-white material to be changed greatly, the consumption of the high-strength steel is even increased to nearly 90% from the original 10%, and in the application of the high-strength steel and the advanced high-strength steel, the consumption of the dual-phase steel with good matching of strength and ductility is 70% -80%. Because hot galvanizing products have good corrosion resistance and are applied to automobiles more and more, the demand for hot galvanizing dual-phase steel is more and more urgent. The 600-800 MPa grade hot-galvanized dual-phase steel is supplied in batches, the order quantity is increased year by year, but the production of the hot-galvanized dual-phase steel with higher strength is still difficult.
At present, 1000 MPa-grade hot-dip galvanized dual-phase steel is developed at home and abroad, but the hot-dip galvanized dual-phase steel has the problems of poor platability, poor coating bonding force, high cost and the like in production. In order to avoid the problem of hot galvanizing surface quality, the components of most galvanized dual-phase steel sheets are designed to be free of Si, so that the negative influence of Si on the surface quality is avoided, and meanwhile, other alloy elements are adopted to compensate the strength loss caused by Si, so that the production cost is high. In addition, due to the limitation of the temperature of the zinc liquid in the zinc pot, in order to avoid bainite transformation or martensite tempering, the method has to be limited by a process window, and a plurality of alloy elements are added, so that the production cost is increased more obviously.
Therefore, it is a problem to be solved to study how to develop a new hot-dip galvanized dual-phase steel, which still does not reduce the surface quality of the hot-dip galvanized dual-phase steel and realizes low-cost production on the basis of adding Si.
Disclosure of Invention
In view of the above, the invention provides a 1000 MPa-grade low-cost hot-dip galvanized dual-phase steel and a preparation method thereof, so as to at least solve the problems of poor galvanized surface quality, high production cost and the like of the conventional hot-dip galvanized steel.
The invention provides 1000 MPa-grade low-cost hot-dip galvanized dual-phase steel on one hand, which comprises the following elements in percentage by weight:
c: 0.080-0.100%, Si: 0.35-0.55%, Mn: 2.40-2.60%, Cr: 0.45-0.55%, P is less than or equal to 0.015%, S is less than or equal to 0.008%, Al: 0.030 to 0.050% and the balance of Fe and inevitable impurities.
The invention also provides a preparation method of 1000 MPa-grade low-cost hot-dip galvanized dual-phase steel, which comprises the following steps:
molten iron pretreatment, converter smelting, external refining, continuous casting, heating, controlled rolling and controlled cooling, reeling and acid pickling;
pre-oxidizing the acid-washed steel plate for 8-12 s at 700-750 ℃ in an oxidizing atmosphere;
and continuously annealing the oxidized steel plate in a reducing atmosphere, and performing hot galvanizing to obtain a finished product.
Preferably, the element content of the hot-dip galvanized dual-phase steel needs to be controlled by steelmaking production, specifically, the steps of molten iron pretreatment, converter smelting, external refining and continuous casting are controlled, and the specific control requirements are as follows:
after the molten iron is pretreated, the S content in the molten iron is required to be less than or equal to 0.003 percent, and the thickness of the iron slag is required to be less than or equal to 20 mm;
the converter smelting adopts aluminum-iron alloy as a deoxidizer, lime selects active lime, low-carbon low-phosphorus ferromanganese and low-chromium for alloying, carbon determination and tapping are carried out, and the target temperature of the end point of the converter is controlled as follows: the temperature of the first furnace is 1675-1695 ℃, and the temperature of the continuous casting furnace is 1665-1685 ℃;
target temperature of external refining end point: the temperature of the first furnace is 1580-1590 ℃, and the temperature of the continuous casting furnace is 1575-1585 ℃;
in the continuous casting process, peritectic alloy crystallizer covering slag is adopted, the covering slag in the wide and thick plates is used as a tundish covering agent, and the continuous casting drawing speed is required to be 1.0-1.4 m/min.
Further preferably, the heating temperature in the heating step is 1240-1270 ℃.
Further preferably, the initial rolling temperature in the controlled rolling and controlled cooling step is 1100-1130 ℃; the finishing temperature is 890-910 ℃; and cooling by adopting a laminar cooling mode, wherein the cooling rate is 25-30 ℃/s.
More preferably, the coiling temperature in the coiling step is 590 to 610 ℃.
Further preferably, the oxidizing atmosphere consists of oxygen and nitrogen, the volume content of the oxygen is 1.5-2.0%, and the dew point of the oxidizing atmosphere is controlled to be-15 to-20 ℃.
Further preferably, the reducing atmosphere consists of nitrogen and hydrogen, and the volume content of the hydrogen is 5-10%.
Further preferably, the hot galvanizing is performed by 5 stages of a heating section, a soaking section, a slow cooling section, a fast cooling section and a balancing section in sequence, wherein the temperature of a steel plate before being put into a zinc pot is 460 +/-10 ℃, the temperature of zinc liquid in the zinc pot is 460 +/-10 ℃, and the process speed of the hot galvanizing is 100 +/-10 m/min; the heating section raises the temperature of the steel plate to 820 +/-10 ℃; the soaking section uniformly maintains the temperature of the steel plate at 820 +/-10 ℃; the slow cooling section reduces the temperature of the steel plate to 720 +/-10 ℃, and the cooling speed is 9-12 ℃/s; the rapid cooling section reduces the temperature of the steel plate to 460 +/-10 ℃ and the cooling speed is 25-35 ℃/s; the equalizing section controls the temperature of the steel plate to be 460 +/-10 ℃.
The 1000 MPa-level low-cost hot-dip galvanized dual-phase steel provided by the invention adopts the design of C-Mn-Si alloy components, and the preparation cost of the hot-dip galvanized dual-phase steel is reduced by adding a proper amount of Cr element to replace the noble element Mo. Meanwhile, in the preparation method, a pre-oxidation process is additionally arranged before annealing and hot galvanizing, the surface of the substrate is mainly covered by an oxidation/reduction layer containing metal Fe, the oxidation/reduction layer is divided by a plurality of holes, and the holes contain the mixture of oxides of Mn, Si and Al. The oxidation of the alloying elements takes place at a distance from the surface layer, the formed oxide is under the oxidation/reduction layer, the pre-oxidation is favorable for the interdiffusion reaction of Fe and Zn. Then through proper dew point control, ideal Fe is formed2Al5A suppression layer, the substrate surface being completely coated with Fe2Al5The layer is covered, thereby avoiding the deposition of Mn and Si oxides on the surface of the matrix, improving the infiltration reaction of Fe and zinc liquid and further improving the platability of the substrate. And then, when the subsequent annealing and the heat treatment in a proper hydrogen reducing atmosphere are carried out, the oxides of Mn and Si are pushed to the sub-surface of the matrix, the silicon and manganese oxides on the surface layer are stripped, and the surface of pure iron is formed after the annealing, so that the relatively satisfactory plating performance is obtained.
The 1000 MPa-level low-cost hot-dip galvanized dual-phase steel provided by the invention has the advantages that the smelted casting blank alloy elements are few, the hardenability of the steel can be still ensured without adding a noble element Mo, the steel-making production is easy, the consumption of raw materials is reduced, the production cost of enterprises is favorably reduced, the pre-oxidation equipment of a hot-dip galvanizing unit is fully utilized, the platability of the Si-containing dual-phase steel is realized, the surface quality of a product is improved, the 1000MPa strength requirement is realized through rapid cooling after plating, the production control is relatively simple, the process parameters are easy to realize, the surface quality is good, the comprehensive mechanical property is excellent, the related requirements of the product are better.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a photograph of a galvanization of a steel sheet without a pre-oxidation process;
FIG. 2 is a photograph of a zinc plating film of a dual phase steel sheet prepared by the method of the present invention.
Detailed Description
The present invention is further explained below with reference to specific embodiments, but is not intended to limit the scope of the present invention.
Since the 1000MPa grade hot dip galvanized dual phase steel has high strength requirement on a steel sheet, a Si element is generally provided in the steel sheet to enhance the strength of the steel sheet, but in actual production, it is found that the presence of the Si element causes poor platability of the steel sheet, poor bonding force of a plating layer, and easy occurrence of a phenomenon of plating omission. Conventionally, in order to solve this problem, it has been common practice to substitute Si with another alloy element, and this method can compensate for the decrease in strength due to the lack of Si, but this method greatly increases the production cost of the steel sheet, and is not suitable for subsequent popularization and use. Therefore, the embodiment firstly tries to adopt the C-Mn-Si alloy composition design and simultaneously matches with the pre-oxidation process and the matched dew point control, thereby reducing the preparation cost of the steel plate and simultaneously improving the platability of the steel plate.
Specifically, the 1000 MPa-grade hot-dip galvanized dual-phase steel comprises the following elements in percentage by weight:
c: 0.080-0.100%, Si: 0.35-0.55%, Mn: 2.40-2.60%, Cr: 0.45-0.55%, P is less than or equal to 0.015%, S is less than or equal to 0.008%, Al: 0.030 to 0.050% and the balance of Fe and inevitable impurities.
In the component design, the hot galvanizing dual-phase steel adopts the C-Mn-Si alloy component design, and simultaneously, a proper amount of Cr element is added to replace the noble element Mo, so that the hardenability of the steel can be improved, martensite is easy to obtain, bainite is avoided, and the cost of the alloy element can be reduced.
In order to match the above ingredient system design, the present embodiment provides a preparation method adapted to the above ingredient system design, which specifically includes the following steps:
1) molten iron pretreatment, converter smelting, external refining, continuous casting, heating, controlled rolling and controlled cooling, reeling and acid pickling;
2) pre-oxidizing the acid-washed steel plate for 8-12 s at 700-750 ℃ in an oxidizing atmosphere;
3) and continuously annealing the oxidized steel plate in a reducing atmosphere, and performing hot galvanizing to obtain a finished product.
In the preparation method, a pre-oxidation step is additionally arranged before the continuous annealing step, mutual diffusion reaction of Fe and Zn is facilitated through a pre-oxidation process, so that the surface of the substrate is mainly covered by an oxidation/reduction layer containing metal Fe, the oxidation/reduction layer is divided by a plurality of holes, the holes contain a mixture of oxides of Mn, Si and Al, and the formed oxides are arranged below the oxidation/reduction layer. Then through proper dew point control, ideal Fe is formed2Al5A suppression layer, the substrate surface being completely coated with Fe2Al5The layer covers and avoids the deposition of Mn and Si oxides on the surface of the substrate. Tong (Chinese character of 'tong')After the subsequent annealing and the heat treatment in proper hydrogen reducing atmosphere, the oxides of Mn and Si are pushed to the sub-surface of the matrix, the silicon and manganese oxides on the surface layer are stripped, and the surface of pure iron is formed after the annealing, so that the satisfactory plating performance is obtained.
The oxidizing atmosphere in the step 2) consists of oxygen and nitrogen, the volume content of the oxygen is 1.5-2.0%, and the dew point of the oxidizing atmosphere is controlled to be-15-20 ℃.
In order to match the oxidizing atmosphere in the pre-oxidation process in the step 2), the reducing atmosphere in the step 3) is designed to be composed of nitrogen and hydrogen, and the volume content of the hydrogen is 5-10%; the pre-oxidation atmosphere and the reducing atmosphere are properly matched to achieve a satisfactory plating effect. The surface of the matrix is seriously oxidized due to over pre-oxidation, and the later oxide cannot be reduced to cause that galvanizing cannot be performed; if the pre-oxidation is not enough, the effect of controlling Mn, Si and Al oxides cannot be achieved. If the reducing atmosphere is not properly adopted, on one hand, oxides may still exist on the surface of the substrate, and on the other hand, hydrogen is wasted, and the cost is increased.
The hot galvanizing in the step 3) is specifically as follows: galvanizing is carried out in 5 stages of a heating section, a soaking section, a slow cooling section, a fast cooling section and a balancing section in sequence, wherein the temperature of a steel plate before the steel plate is put into a zinc pot is 460 +/-10 ℃, the temperature of zinc liquid in the zinc pot is 460 +/-10 ℃, and the process speed of hot galvanizing is 100 +/-10 m/min; the heating section raises the temperature of the steel plate to 820 +/-10 ℃; the soaking section uniformly maintains the temperature of the steel plate at 820 +/-10 ℃; the slow cooling section reduces the temperature of the steel plate to 720 +/-10 ℃, and the cooling speed is 9-12 ℃/s; the rapid cooling section reduces the temperature of the steel plate to 460 +/-10 ℃ and the cooling speed is 25-35 ℃/s; the equalizing section controls the temperature of the steel plate to be 460 plus or minus 10 ℃; the hot galvanizing process can obtain stable product performance through sectional heating and cooling.
In addition, preferably, S in the molten iron is less than or equal to 0.003 percent and the thickness of the iron slag is less than or equal to 20mm after the molten iron is pretreated in the step 1); the converter smelting adopts aluminum-iron alloy as a deoxidizer, lime selects active lime, low-carbon low-phosphorus ferromanganese and low-chromium for alloying, carbon determination and tapping are carried out, and the target temperature of the end point of the converter is controlled as follows: the temperature of the first furnace is 1675-1695 ℃, and the temperature of the continuous casting furnace is 1665-1685 ℃; target temperature of external refining end point: the temperature of the first furnace is 1580-1590 ℃, and the temperature of the continuous casting furnace is 1575-1585 ℃; in the continuous casting process, peritectic alloy crystallizer covering slag is adopted, the covering slag in the wide and thick plates is used as a tundish covering agent, and the continuous casting drawing speed is required to be 1.0-1.4 m/min. The corresponding heating temperature in the heating step is 1240-1270 ℃; the initial rolling temperature in the controlled rolling and controlled cooling step is 1100-1130 ℃; the finishing temperature is 890-910 ℃; cooling by adopting a laminar cooling mode, wherein the cooling rate is 25-30 ℃/s; the coiling temperature in the coiling step is 590-610 ℃.
Experiments prove that: by adopting the composition system and the preparation method, the steel plate meeting the strength requirement of 1000Mpa grade can be prepared, the preparation cost is low, the galvanizing effect is good, and the plating leakage rate is basically zero.
The present invention is further illustrated by the following specific examples, which are not intended to limit the scope of the invention.
Example 1
The 1000 MPa-grade low-cost hot-dip galvanized dual-phase steel comprises the following components in percentage by weight: c: 0.088%, Si: 0.51%, Mn: 2.52%, Cr: 0.47%, P: 0.009%, S: 0.002%, Al: 0.038%, and the balance of Fe and inevitable impurities.
The hot-dip galvanized dual-phase steel is prepared by the following process flow: molten iron pretreatment → converter smelting → external refining → continuous casting → heating → controlled rolling and controlled cooling → coiling → acid cleaning → pre-oxidation → continuous annealing → hot galvanizing → finishing → functional inspection → packaging and delivery;
wherein, the S content in the molten iron is required to be less than or equal to 0.003 percent and the thickness of the iron slag is required to be less than or equal to 20mm after the molten iron is pretreated; the converter smelting adopts aluminum-iron alloy as a deoxidizer, lime selects active lime, low-carbon low-phosphorus ferromanganese and low-chromium for alloying, carbon determination and tapping are carried out, and the target temperature of the end point of the converter is controlled as follows: the temperature of the first furnace is 1675-1695 ℃, and the temperature of the continuous casting furnace is 1665-1685 ℃; target temperature of external refining end point: the temperature of the first furnace is 1580-1590 ℃, and the temperature of the continuous casting furnace is 1575-1585 ℃; in the continuous casting process, peritectic alloy crystallizer covering slag is adopted, and covering slag is contained in a wide and thick plateAs a tundish covering agent, the continuous casting speed is required to be 1.0-1.4 m/min. The hot-rolled plate blank is heated at 1240-1270 ℃, rolled at 1100-1130 ℃ and rolled at 890-910 ℃, and is cooled by laminar flow after rolling, the cooling rate is 25-30 ℃/s, and the coiling temperature is 590-610 ℃. The cold rolling adopts 54 percent of reduction rate, adopts pre-oxidation process and reasonable control of dew point, and ensures the surface quality of the steel plate. Wherein, the pre-oxidation process comprises the following steps: by the use of O2+N2Atmosphere, O2Is 1.8 percent, is pre-oxidized for 8s at 750 ℃, and the dew point of the atmosphere is controlled to be-18 ℃. The continuous annealing and the hot galvanizing are both carried out in a reducing atmosphere, the reducing atmosphere consists of nitrogen and hydrogen, and the volume content of the hydrogen is 5-10%.
The hot galvanizing annealing process parameters are shown in the following table:
the mechanical properties of the final product are shown in the following table:
| steel grade | Yield strength (MPa) | Tensile strength (MPa) | Elongation after fracture A80mm(％) |
| Standard of merit | 590～740 | ≥980 | ≥10 |
| HCT980X+Z | 633 | 1040 | 12.5 |
Example 2
The 1000 MPa-grade low-cost hot-dip galvanized dual-phase steel comprises the following components in percentage by weight: c: 0.091%, Si: 0.46%, Mn: 2.55%, Cr: 0.48%, P: 0.012%, S: 0.001%, Al: 0.041 percent, and the balance of Fe and inevitable impurities.
The hot-dip galvanized dual-phase steel is prepared by the following process flow: molten iron pretreatment → converter smelting → external refining → continuous casting → heating → controlled rolling and controlled cooling → coiling → acid cleaning → pre-oxidation → continuous annealing → hot galvanizing → finishing → functional inspection → packaging and delivery;
wherein, the S content in the molten iron is required to be less than or equal to 0.003 percent and the thickness of the iron slag is required to be less than or equal to 20mm after the molten iron is pretreated; the converter smelting adopts aluminum-iron alloy as a deoxidizer, lime selects active lime, low-carbon low-phosphorus ferromanganese and low-chromium for alloying, carbon determination and tapping are carried out, and the target temperature of the end point of the converter is controlled as follows: the temperature of the first furnace is 1675-1695 ℃, and the temperature of the continuous casting furnace is 1665-1685 ℃; target temperature of external refining end point: the temperature of the first furnace is 1580-1590 ℃, and the temperature of the continuous casting furnace is 1575-1585 ℃; in the continuous casting process, peritectic alloy crystallizer covering slag is adopted, the covering slag in the wide and thick plates is used as a tundish covering agent, and the continuous casting drawing speed is required to be 1.0-1.4 m/min. The hot-rolled plate blank is heated at 1240-1270 ℃, rolled at 1100-1130 ℃ and rolled at 890-910 ℃, and is cooled by laminar flow after rolling, the cooling rate is 25-30 ℃/s, and the coiling temperature is 590-610 ℃. The cold rolling adopts 55 percent of reduction rate, adopts pre-oxidation process and reasonable control of dew point, and ensures the surface quality of the steel plate. Wherein, the pre-oxidation process comprises the following steps: by the use of O2+N2Atmosphere, O2Is 1.7 percent, is pre-oxidized for 8s at 750 ℃, and the dew point of the atmosphere is controlled to be-18 ℃. The continuous annealing and the hot galvanizing are both carried out in a reducing atmosphere, and the reduction is carried outThe atmosphere consists of nitrogen and hydrogen, and the volume content of the hydrogen is 5-10%.
The hot galvanizing annealing process parameters are shown in the following table:
the mechanical properties of the final product are shown in the following table:
| steel grade | Yield strength (MPa) | Tensile strength (MPa) | Elongation after fracture A80mm(％) |
| Standard of merit | 590～740 | ≥980 | ≥10 |
| HCT980X+Z | 651 | 1063 | 12 |
Example 3
The 1000 MPa-grade low-cost hot-dip galvanized dual-phase steel comprises the following components in percentage by weight: c: 0.086%, Si: 0.53%, Mn: 2.48%, Cr: 0.54%, P: 0.010%, S: 0.001%, Al: 0.045%, and the balance of Fe and inevitable impurities.
The hot-dip galvanized dual-phase steel is prepared by the following process flow: molten iron pretreatment → converter smelting → external refining → continuous casting → heating → controlled rolling and controlled cooling → coiling → acid cleaning → pre-oxidation → continuous annealing → hot galvanizing → finishing → functional inspection → packaging and delivery;
wherein, the S content in the molten iron is required to be less than or equal to 0.003 percent and the thickness of the iron slag is required to be less than or equal to 20mm after the molten iron is pretreated; the converter smelting adopts aluminum-iron alloy as a deoxidizer, lime selects active lime, low-carbon low-phosphorus ferromanganese and low-chromium for alloying, carbon determination and tapping are carried out, and the target temperature of the end point of the converter is controlled as follows: the temperature of the first furnace is 1675-1695 ℃, and the temperature of the continuous casting furnace is 1665-1685 ℃; target temperature of external refining end point: the temperature of the first furnace is 1580-1590 ℃, and the temperature of the continuous casting furnace is 1575-1585 ℃; in the continuous casting process, peritectic alloy crystallizer covering slag is adopted, the covering slag in the wide and thick plates is used as a tundish covering agent, and the continuous casting drawing speed is required to be 1.0-1.4 m/min. The hot-rolled plate blank is heated at 1240-1270 ℃, rolled at 1100-1130 ℃ and rolled at 890-910 ℃, and is cooled by laminar flow after rolling, the cooling rate is 25-30 ℃/s, and the coiling temperature is 590-610 ℃. The cold rolling adopts 53 percent of reduction rate, adopts pre-oxidation process and reasonable control of dew point, and ensures the surface quality of the steel plate. Wherein, the pre-oxidation process comprises the following steps: by the use of O2+N2Atmosphere, O2Is 1.8 percent, is pre-oxidized for 8s at 750 ℃, and the dew point of the atmosphere is controlled to be-18 ℃. The continuous annealing and the hot galvanizing are both carried out in a reducing atmosphere, the reducing atmosphere consists of nitrogen and hydrogen, and the volume content of the hydrogen is 5-10%.
The hot galvanizing annealing process parameters are shown in the following table:
the mechanical properties of the final product are shown in the following table:
| steel grade | Yield strength (MPa) | Tensile strength (MPa) | Elongation after fracture A80mm(％) |
| Standard of merit | 590～740 | ≥980 | ≥10 |
| HCT980X+Z | 662 | 1049 | 12.5 |
Compared with 1000 MPa-grade dual-phase steel added with Mo alloy elements, the cost of per ton steel can be reduced by at least 180 yuan by adopting Cr to replace Mo elements, and the cost is additionally increased by adopting other alloy elements to replace Si elements. Therefore, the cost of the product of the invention is at least 200 yuan lower than that of the dual-phase steel of 1000MPa grade of the traditional production process.
Referring to fig. 1, which is a photograph of a galvanized steel sheet without a pre-oxidation process, and fig. 2, which is a photograph of a galvanized steel sheet after the above scheme is adopted, it can be seen from the above figure that a plating leakage rate of 100% occurs without surface control methods such as a pre-oxidation process, and particularly, the plating leakage phenomenon is very serious at the edge of the steel sheet, and a steel sheet with good surface and no plating leakage can be obtained by adopting a pre-oxidation process suitable in the present embodiment.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It is to be understood that the present invention is not limited to what has been described above, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (9)
1. The 1000 MPa-grade low-cost hot-dip galvanized dual-phase steel is characterized by comprising the following elements in percentage by weight:
c: 0.080-0.100%, Si: 0.35-0.55%, Mn: 2.40-2.60%, Cr: 0.45-0.55%, P is less than or equal to 0.015%, S is less than or equal to 0.008%, Al: 0.030 to 0.050% and the balance of Fe and inevitable impurities.
2. The preparation method of the 1000 MPa-grade low-cost hot-dip galvanized dual-phase steel according to claim 1, characterized by comprising the following steps of:
molten iron pretreatment, converter smelting, external refining, continuous casting, heating, controlled rolling and controlled cooling, reeling and acid pickling;
pre-oxidizing the acid-washed steel plate for 8-12 s at 700-750 ℃ in an oxidizing atmosphere;
and continuously annealing the oxidized steel plate in a reducing atmosphere, and performing hot galvanizing to obtain a finished product.
3. The method for preparing 1000 MPa-grade low-cost hot-dip galvanized dual-phase steel according to claim 2, wherein the element content of the hot-dip galvanized dual-phase steel needs to be controlled by steelmaking production, specifically, molten iron pretreatment, converter smelting, external refining and continuous casting, and the specific control requirements are as follows:
after the molten iron is pretreated, the S content in the molten iron is required to be less than or equal to 0.003 percent, and the thickness of the iron slag is required to be less than or equal to 20 mm;
the converter smelting adopts aluminum-iron alloy as a deoxidizer, lime selects active lime, low-carbon low-phosphorus ferromanganese and low-chromium for alloying, carbon determination and tapping are carried out, and the target temperature of the end point of the converter is controlled as follows: the temperature of the first furnace is 1675-1695 ℃, and the temperature of the continuous casting furnace is 1665-1685 ℃;
target temperature of external refining end point: the temperature of the first furnace is 1580-1590 ℃, and the temperature of the continuous casting furnace is 1575-1585 ℃;
in the continuous casting process, peritectic alloy crystallizer covering slag is adopted, the covering slag in the wide and thick plates is used as a tundish covering agent, and the continuous casting drawing speed is required to be 1.0-1.4 m/min.
4. The preparation method of the 1000 MPa-grade low-cost hot-dip galvanized dual-phase steel according to claim 2, characterized in that the heating temperature in the heating step is 1240-1270 ℃.
5. The preparation method of the 1000 MPa-grade low-cost hot-dip galvanized dual-phase steel according to claim 2, characterized in that the initial rolling temperature in the controlled rolling and cooling step is 1100-1130 ℃; the finishing temperature is 890-910 ℃; and cooling by adopting a laminar cooling mode, wherein the cooling rate is 25-30 ℃/s.
6. The preparation method of the 1000 MPa-grade low-cost hot-dip galvanized dual-phase steel according to claim 2, characterized in that the coiling temperature in the coiling step is 590-610 ℃.
7. The preparation method of the 1000 MPa-grade low-cost hot-dip galvanized dual-phase steel according to claim 2, characterized in that the oxidizing atmosphere consists of oxygen and nitrogen, the volume content of the oxygen is 1.5-2.0%, and the dew point of the oxidizing atmosphere is controlled to be-15 ℃ to-20 ℃.
8. The method for preparing 1000MPa grade low-cost hot-dip galvanized dual-phase steel according to claim 2, characterized in that the reducing atmosphere consists of nitrogen and hydrogen, and the volume content of the hydrogen is 5-10%.
9. The preparation method of the 1000 MPa-grade low-cost hot-dip galvanized dual-phase steel according to claim 2, characterized in that the hot-dip galvanized steel is galvanized in 5 stages of a heating section, a soaking section, a slow cooling section, a fast cooling section and a balancing section in sequence, wherein the temperature of a steel plate before being put into a zinc pot is 460 +/-10 ℃, the temperature of a zinc liquid in the zinc pot is 460 +/-10 ℃, and the process speed of the hot-dip galvanizing is 100 +/-10 m/min; the heating section raises the temperature of the steel plate to 820 +/-10 ℃; the soaking section uniformly maintains the temperature of the steel plate at 820 +/-10 ℃; the slow cooling section reduces the temperature of the steel plate to 720 +/-10 ℃, and the cooling speed is 9-12 ℃/s; the rapid cooling section reduces the temperature of the steel plate to 460 +/-10 ℃ and the cooling speed is 25-35 ℃/s; the equalizing section controls the temperature of the steel plate to be 460 +/-10 ℃.
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