CN113234994A - Hot-rolled high-strength weather-resistant steel plate with yield strength of 600MPa and production method thereof - Google Patents
Hot-rolled high-strength weather-resistant steel plate with yield strength of 600MPa and production method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Abstract
The invention discloses a hot-rolled high-strength weather-resistant steel plate with yield strength of 600MPa and a production method thereof, belonging to the field of high-strength weather-resistant steel, wherein the steel plate comprises the following main chemical components in percentage by mass: c: 0.06% -0.09%, Si: 0.25-0.50%, Mn: 0.40% -0.70%, P: 0.015 to 0.030%, S: less than or equal to 0.005 percent, Cr: 0.40-0.70%, Cu: 0.22-0.40%, Als: 0.020% -0.045%, Ti: 0.055-0.080%, N is less than or equal to 0.0040%, O is less than or equal to 0.0035%, and the balance is Fe and inevitable impurity elements, wherein the chemical components also need to meet the requirement that [ Ti ] -3.42[ N ] -3[ S ] is more than or equal to 0.040%; the microstructure of the steel plate is quasi-polygonal ferrite and pearlite, and the pearlite content is 3% -5%. The high-strength weather-resistant steel has the advantages that the production cost is greatly reduced, the high-strength weather-resistant steel has good atmospheric corrosion resistance, welding performance and comprehensive mechanical property, and the thickness range of the plate is 1.5-6.0 mm.
Description
Technical Field
The invention belongs to the field of high-strength weathering steel, and particularly relates to a hot-rolled high-strength weathering steel plate with yield strength of 600MPa and a production method thereof.
Background
The weathering steel has good atmospheric corrosion resistance, can effectively prolong the service life of the material, and is widely applied to the industries of railway vehicles, containers, bridges and the like. At present, the hot-rolled weather-resistant steel plate for the container is mainly made of weather-resistant steel with yield strength of 355MPa, the representative mark of SPA-H and the design of Cu-P-Cr-Ni components. With the rapid development of the container transportation industry, the light weight and large load of the container are the future development trend. The high-strength weathering steel is adopted, so that the steel plate can be thinned to reduce the self weight of the container; on the other hand, the load of the container can be increased, so that the freight volume is increased, and the transportation efficiency is improved. In recent years, special containers exported abroad in China and 35-ton open-top containers for railway freight all adopt weather-resistant steel plates with the strength level of more than 550MPa to realize light weight and large load.
At present, domestic application patents on hot-rolled high-strength weathering steel with yield strength of 600MPa are less.
The Chinese patent application numbers are: 200810026086.X, published as: 2008-07-23 of a 600MPa grade high-strength weathering steel and a preparation method thereof, the 600MPa grade high-strength weathering steel is prepared by adopting an electric furnace-thin slab continuous casting and rolling process, and the refined molten steel for preparing the high-strength weathering steel comprises the following main chemical components: c: 0.045-0.07 wt%, Si: 0.10 to 0.29 wt%, Mn: 0.8-1.5 wt%, P: 0.005 to 0.030 wt%, S: 0.002-0.008 wt%, Cu: 0.20 to 0.5 wt%, Cr: 0.3 to 0.7 wt%, Ni: 0.15 to 0.35 wt%, Ti: 0.06-0.079 wt%, Nb: 0.035-0.050 wt%, Alt: 0.025 to 0.050 wt%. The component design adopts Nb and Ti composite micro-alloying, and is prepared by an electric furnace and a thin slab continuous casting and rolling process flow.
The Chinese patent application numbers are: 200510019116.0, publication date is: 2006-01-11 of a 600MPa grade high strength weathering steel and its preparation method, the steel comprises the following chemical components by weight percent: c: 0.05-0.09, Si: 0.45-0.70, Mn: 2.10 to 3.00, P: less than or equal to 0.02, S: less than or equal to 0.01, Ti: 0.005 to 0.009, Nb: 0.095 to 0.19, Ni: 0.10 to 0.19, Cu: 0.45-0.65, Cr: 0.75-1.50, Ca is less than or equal to 0.02, and the balance is Fe and impurities, and simultaneously the following conditions are met: 0.70 < Cr + Ni + Cu < 2.50 and Nb > 4Ti +3 Ca. The Nb microalloying (0.095-0.19%) and high Mn content (2.10-3.00%) are adopted for component design, the high-strength weathering steel is suitable for production of thick high-strength weathering steel, and the tensile strength is 600 MPa.
Disclosure of Invention
1. Problems to be solved
Aiming at the problem that the existing high-strength weathering steel is difficult to produce, the invention provides a hot-rolled high-strength weathering steel plate with yield strength of 600MPa and a production method thereof, the production cost of the high-strength weathering steel is greatly reduced, the high-strength weathering steel has good atmospheric corrosion resistance, welding performance and comprehensive mechanical property, and the plate thickness range is 1.5-6.0 mm.
2. Technical scheme
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the invention relates to a hot-rolled high-strength weather-resistant steel plate with yield strength of 600MPa, which comprises the following main chemical components in percentage by mass: c: 0.06% -0.09%, Si: 0.25-0.50%, Mn: 0.40% -0.70%, P: 0.015 to 0.030%, S: less than or equal to 0.005 percent, Cr: 0.40-0.70%, Cu: 0.22-0.40%, Als: 0.020% -0.045%, Ti: 0.055-0.080%, N less than or equal to 0.0040%, O less than or equal to 0.0035%, and the balance of Fe and inevitable impurity elements;
the chemical composition also needs to satisfy that [ Ti ] -3.42[ N ] -3[ S ] is more than or equal to 0.040%;
the thickness range of the plate is 1.5-6.0 mm;
the microstructure of the steel plate is quasi-polygonal ferrite and pearlite, and the pearlite content is 3% -5%.
As a further illustration of the present invention, the ferrite average grain size is 5.5 μm.
As a further illustration of the present invention, the chemical elements also need to satisfy I ≧ 6.0, where I ═ 26.01 (% Cu) +3.88 (% Ni) +1.20 (% Cr) +1.49 (% Si) +17.28 (% P) -7.29 (% Cu) × (% Ni) -9.10 (% Ni) × (% P) -33.39 (% Cu)2。
As a further illustration of the invention, the steel sheet yield strength ReLMore than or equal to 600MPa, tensile strength Rm more than or equal to 650MPa and elongation A more than or equal to 22 percent.
The invention relates to a production method of a hot-rolled high-strength weather-resistant steel plate with yield strength of 600MPa, which comprises the following steps:
s1, smelting molten steel;
s2, refining in duplex mode by 'LF + RH';
s3, continuous casting;
s4, heating by a heating furnace;
s5, rolling;
s6, cooling by dense laminar flow, wherein the cooling speed is more than or equal to 30 ℃/S;
s7, coiling;
and S8, finishing.
As a further explanation of the present invention, in the step S2, RH vacuum deep degassing is performed for 16min or more.
As a further explanation of the invention, in the step S4, the temperature of the continuous casting slab in the heating furnace is more than or equal to 500 ℃, the temperature of the first heating outlet of the heating furnace is less than 1000 ℃, the temperature is quickly increased to 1200 ℃ and the temperature of the soaking section is more than or equal to 1230 ℃.
As a further description of the present invention, in step S4, the time of the two-addition plus soaking is less than 100min, and the air excess coefficient of the heating furnace is less than 1.0.
As a further description of the present invention, the step S5 includes rough rolling and finish rolling, the rough rolling temperature is controlled to be 1050 ℃ or higher, and the cumulative reduction rate is not less than 80%; the initial rolling temperature of the finish rolling is less than or equal to 1030 ℃, the accumulated deformation is more than or equal to 85%, and the finish rolling temperature is 860-920 ℃.
According to the invention, the single Ti microalloying technology is adopted in the conventional hot continuous rolling strip production line to realize the batch stable production of the thin-specification hot-rolled high-strength weather-resistant steel plate with the yield strength of 600MPa, and the method is different from the traditional method for inhibiting copper brittleness by adding precious alloy Ni into weather-resistant steel, Ni is not added in the method, and the occurrence of copper brittleness defect is inhibited through the heating process design; meanwhile, the energy consumption of a heating furnace is reduced by adopting a casting blank hot charging rolling process, and the manufacturing cost of the high-strength weathering steel is greatly reduced.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) the hot-rolled high-strength weather-resistant steel plate with the yield strength of 600MPa is high in strength and high in plasticity, the yield strength ReL is more than or equal to 600MPa, the tensile strength Rm is more than or equal to 650MPa, the elongation A is more than or equal to 22 percent;
(2) the hot-rolled high-strength weather-resistant steel plate with the yield strength of 600MPa has no cracks on the outer side surface of a sample subjected to 180-degree cold bending (d is a) and double cold bending, has good cold bending forming performance, and is convenient for downstream users to manufacture and process;
(3) the hot-rolled high-strength weather-resistant steel plate with the yield strength of 600MPa is designed by adopting low Mn and Ti microalloying and Cu-Cr-P-Si element matching, has high strength and plasticity and good atmospheric corrosion resistance, and greatly reduces the manufacturing cost of the high-strength weather-resistant steel;
(4) the hot-rolled high-strength weather-resistant steel plate with the yield strength of 600MPa effectively reduces the energy consumption of a heating furnace and the oxidation burning loss of a casting blank by adopting a hot charging rolling process, improves the hot-rolled yield and further reduces the manufacturing cost.
Drawings
The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for illustrative purposes only and thus do not limit the scope of the present invention. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein and are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of a metallographic structure of a hot-rolled high-strength weather-resistant steel plate with a yield strength of 600MPa according to the invention;
FIG. 2 is a metallographic structure SEM photograph of a hot-rolled high-strength weather-resistant steel plate with a yield strength of 600 MPa;
FIG. 3 shows the morphology of Cu-containing two-phase precipitated particles of a hot-rolled high-strength weather-resistant steel plate with a yield strength of 600 MPa;
FIG. 4 is an EDS energy spectrum of Cu-containing two-phase precipitated particles of a hot-rolled high-strength weather-resistant steel plate with a yield strength of 600 MPa;
FIG. 5 shows the appearance of TiC two-phase precipitated particles of a hot-rolled high-strength weather-resistant steel plate with a yield strength of 600 MPa;
FIG. 6 is an EDS energy spectrum of TiC two-phase precipitated particles of a hot-rolled high-strength weather-resistant steel plate with a yield strength of 600 MPa.
Detailed Description
The following detailed description of exemplary embodiments of the invention refers to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration exemplary embodiments in which the invention may be practiced. Although these exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, it should be understood that other embodiments may be realized and that various changes to the invention may be made without departing from the spirit and scope of the present invention. The following more detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is presented for purposes of illustration only and not limitation to describe the features and characteristics of the invention, to set forth the best mode of carrying out the invention, and to sufficiently enable one skilled in the art to practice the invention. Accordingly, the scope of the invention is to be limited only by the following claims.
The detailed description and exemplary embodiments of the invention will be better understood when read in conjunction with the appended drawings, where the elements and features of the invention are identified by reference numerals.
The hot-rolled high-strength weather-resistant steel plate with the yield strength of 600MPa has the main chemical components and the mass percentage content shown in the table 1:
TABLE 1 chemical compositions and weight percentages (mass%, balance Fe and unavoidable impurities) of examples and comparative examples
The ingredients of the above examples satisfy the following ranges: c: 0.06% -0.09%, Si: 0.25-0.50%, Mn: 0.40% -0.70%, P: 0.015 to 0.030%, S: less than or equal to 0.005 percent, Cr: 0.40-0.70%, Cu: 0.22-0.40%, Als: 0.020% -0.045%, Ti: 0.055-0.080%, N less than or equal to 0.0040%, O less than or equal to 0.0035%, and the balance of Fe and inevitable impurity elements;
the specific effects of the element composition in the scheme are as follows:
c (carbon): c is the most economical element for improving the strength of steel, but too high C content deteriorates the weldability of steel and reduces the plasticity. In order to improve the strength of the weathering steel, the content of C is designed to be 0.06-0.09%.
Si (silicon): si is beneficial to refining corrosion products and promotes the formation of a compact protective rust layer on the surface of steel so as to improve the atmospheric corrosion resistance, but the welding performance of the steel is reduced due to the excessively high Si content. Therefore, the Si content is designed to be 0.25-0.50%.
Mn (manganese): mn is one of important solid solution strengthening elements in steel, and improves the strength and toughness of the steel. However, too high Mn content not only increases the production cost of the weathering steel, but also deteriorates the weldability of the steel. Therefore, the content is designed to be 0.40 to 0.70%.
P (phosphorus): p is the most economical element for improving the atmospheric corrosion resistance of the steel, and has strong solid solution strengthening effect, but the P content is too high, so that the P is easy to be segregated in grain boundaries to reduce the low-temperature toughness of the steel, and the welding crack sensitivity is increased. Therefore, the P content is designed to be 0.015-0.030%;
s (sulfur): s is a harmful residual element in steel, deteriorates the atmospheric corrosion resistance and ductility and toughness of steel, and is easily combined with Ti and C to form Ti4C2S2And the content of effective Ti in the steel is reduced, so that the strengthening effect of the microalloy element Ti is influenced. Therefore, the S content is designed to be less than or equal to 0.005 percent
Als (aluminum): al is the main deoxidizing element added into steel, and the bonding force of Al and oxygen is greater than that of Ti. However, too high Al causes an increase in Al oxide inclusions in the steel, and decreases the low-temperature toughness and atmospheric corrosion resistance of the steel. Therefore, the content is designed to be 0.020-0.045%.
Cr (chromium): the enrichment of Cr in the rust layer promotes the generation of a compact protective rust layer tightly combined with the matrix, promotes the passivation of the anode and improves the atmospheric corrosion resistance of steel. Since the welding property of the steel is deteriorated by too high Cr content, the Cr content is designed to be 0.30 to 0.70%.
Cu (copper): the Cu can obviously improve the atmospheric corrosion resistance of steel, and the effect is better when the Cu is added with Cr in a composite way; cu also improves the strength of the steel by precipitating fine second phase particles during cooling. However, since the melting point of Cu is 1083 ℃ and cracks are easily generated in the hot rolling of the steel slab due to an excessively high Cu content, the Cu content is designed to be 0.22 to 0.40%.
Ti (titanium): ti is the most economical microalloy element for improving the strength of steel, and mainly has the main functions of inhibiting the growth of austenite grains in the heating process of a plate blank, inhibiting the growth of recrystallized austenite grains in the controlled rolling process so as to refine ferrite grains after phase change, separating out fine second-phase grains in the cooling process after rolling, and improving the strength through the functions of fine grain strengthening and separation strengthening. The content is controlled to be 0.055-0.080%.
O (oxygen), N (nitrogen): in molten steel, O is easy to combine with Ti to generate TiO2N is easy to combine with Ti to form coarse TiN particles, thereby reducing the effective Ti content in steel and reducing the fine-grain strengthening and precipitation strengthening effects of Ti, and therefore, the O content is strictly controlled to be less than or equal to 0.0035 percent and the N content is strictly controlled to be less than or equal to 0.0040 percent.
By adopting a low-C, low-Mn and single-Ti microalloying technology, a rolling and cooling control process is designed in a targeted manner according to the solid solution and precipitation characteristics of a microalloying element Ti, and the fine grain strengthening and precipitation strengthening effects of the Ti element are fully exerted.
Based on Cu and Cr, proper amount of Si and P are added to enrich and promote the generation of a compact protective rust layer and the anode passivation on the surface of a steel matrix, prevent a corrosive medium from diffusing to the matrix and improve the atmospheric corrosion resistance.
As shown in fig. 3-6, in order to ensure the reinforcing effect of the nano-scale TiC particles and improve the strength of the steel, the effective Ti content is [ Ti ] -3.42[ N ] -3[ S ] > 0.040%, and the thickness range of the plate is 1.5-6.0 mm; as shown in FIGS. 1 and 2, the microstructure of the steel sheet was a quasi-polygonal ferrite + pearlite with a pearlite content of 3% to 5% and an average grain size of ferrite of 5.5 μm.
The weathering index I of this steel grade was calculated with reference to the formula Legault-Leckie modified in American society for testing and materials Standard ASTM G101-01, I ═ 26.01 (% Cu) +3.88 (% Ni) +1.20 (% Cr) +1.49 (% Si) +17.28 (% P) -7.29 (% Cu) x (% Ni) -9.10 (% Ni) x (% P) -33.39 (% Cu)2. When the I value is more than or equal to 6.0, the material has good atmospheric corrosion resistance, and the atmospheric corrosion resistance of the material is increased along with the increase of the I value.
The final steel plate yield strength ReLMore than or equal to 600MPa, tensile strength Rm more than or equal to 650MPa and elongation A more than or equal to 22 percent.
The invention adopts the traditional hot continuous rolling process and the casting blank hot charging process for production, and the rolling process comprises the following process flows:
the invention relates to a production method of a hot-rolled high-strength weather-resistant steel plate with yield strength of 600MPa, which comprises the following steps:
and S1, smelting molten steel according to the chemical components in the application.
S2 and double refining of 'LF + RH', wherein RH vacuum deep degassing is more than or equal to 16 min. The molten steel is refined by adopting an LF + RH duplex process, and the sulfur content in the molten steel is further reduced by LF slagging and desulfurization; promoting the floating of non-metallic inclusions and improving the cleanliness of molten steel. RH vacuum deep degassing is more than or equal to 16min, and the residual O, N content in the molten steel is further reduced so as to improve the effective Ti content; the H content is controlled to be less than or equal to 2ppm, and the hydrogen induced crack sensitivity of the high-strength steel is reduced.
And S3, continuously casting, wherein the thickness of the continuous casting slab can be 230 mm.
S4, heating by a heating furnace, wherein the temperature of the continuous casting slab in the heating furnace is more than or equal to 500 ℃, and the phenomenon that the edge of the casting blank cracks due to too low temperature is avoided. The slab enters a walking beam type heating furnace for heating, in order to avoid the surface defect of copper brittleness caused by a low-melting-point alloy element Cu, the temperature of a first heating outlet of the heating furnace is controlled to be less than 1000 ℃, the temperature is increased to 1200 ℃ at a high speed, the temperature of a soaking section is more than or equal to 1230 ℃, the homogenization of austenite is promoted, and the carbonitride of titanium is fully dissolved in austenite, so that the carbonitride of titanium is precipitated in the subsequent rolling and cooling processes. The time of adding two and soaking is less than 100min, and the air excess coefficient of the heating furnace is less than 1.0.
And S5, rolling is carried out in two stages of rough rolling and finish rolling. The rolling temperature in the rough rolling stage is controlled to be more than 1050 ℃, the accumulated reduction rate is more than or equal to 80%, and the multi-pass large deformation is carried out at high temperature, so that the deformation austenite grains are promoted to recover and recrystallize, and the austenite refined grain size is refined. And in the finish rolling stage, 7 frames are adopted for continuous rolling, the finish rolling initial rolling temperature is less than or equal to 1030 ℃, and the accumulated deformation is more than or equal to 85%. By accumulating large deformation, the deformation band and dislocation density in the deformation austenite are increased, ferrite phase transformation nucleation points are increased, and ferrite grains after phase transformation are refined. In order to ensure the grain refining effect, the finish rolling temperature is controlled to be 860-920 ℃.
And S6, cooling by dense laminar flow, wherein the cooling speed is more than or equal to 30 ℃/S. After finishing the finish rolling, intensive cooling is adopted for rapid cooling, the ferrite phase transition starting temperature is reduced, the supercooling degree is improved, the ferrite nucleation critical radius is reduced, the nucleation rate is improved, the ferrite grain size is refined, and the strength and the plasticity of the material are improved through fine-grain strengthening.
S7, coiling, wherein the coiling temperature is controlled to be 590-630 ℃, the coiling temperature is too high, ferrite grains and secondary phase precipitated particles are coarsened, and the strength is insufficient; the bainite structure is generated at the low coiling temperature, the plasticity of the material is reduced, and the forming performance is influenced. And naturally cooling to room temperature after coiling.
And S8, finishing, namely, flattening the thin high-strength weathering steel with poor plate shape and coil shape.
The main process parameters and mechanical properties of the rolling procedures of the examples and comparative examples are shown in table 2. Tensile properties test according to GB/T228.1-2010 "metallic materials tensile test part 1: the test method for the room temperature is carried out, and the cold bending performance test is carried out according to GB/T232-2010 metal material bending test method.
Comparative example 1 a thin slab continuous casting and rolling process was used; comparative example 2 although the conventional hot continuous rolling process was used, the slab thickness was only 200mm, and the yield strength was less than 600MPa using high-temperature finish rolling and high-temperature coiling.
TABLE 2 Main technological parameters and mechanical properties of the rolling process
A72 h cycle immersion corrosion test was conducted according to TB/T2375 with Q345B low alloy steel as a control sample and the test results are shown in Table 3. In the embodiment, the corrosion weight loss rate of the 600MPa grade high-strength weathering steel is reduced by nearly 1 time relative to that of Q345B low alloy steel, and the weathering steel has good atmospheric corrosion resistance.
TABLE 3 atmospheric corrosion resistance of the examples and comparative samples
| Average corrosion weight loss rate, (g/(m)2·h)) | Relative corrosion rate% | |
| Example 1 | / | / |
| Example 2 | 2.05 | 51 |
| Example 3 | 2.14 | 53 |
| Example 4 | 2.11 | 52 |
| Example 5 | 2.08 | 52 |
| Example 6 | 2.01 | 50 |
| Q345B | 4.02 | 100 |
In conclusion, the thin hot-rolled weather-resistant steel plate obtained by the steel grade chemical composition and the controlled rolling and controlled cooling process control technology has the yield strength of more than or equal to 600MP, the tensile strength of more than or equal to 650MPa, the elongation of more than or equal to 22 percent, and has good atmospheric corrosion resistance, cold bending forming performance and low welding crack sensitivity. Can be applied to the manufacture of containers, railway vehicles and the like, and meets the requirements of light weight and heavy load.
Claims (9)
1. A hot-rolled high-strength weather-resistant steel plate with yield strength of 600MPa is characterized by comprising the following main chemical components in percentage by mass: c: 0.06% -0.09%, Si: 0.25-0.50%, Mn: 0.40% -0.70%, P: 0.015 to 0.030%, S: less than or equal to 0.005 percent, Cr: 0.40-0.70%, Cu: 0.22-0.40%, Als: 0.020% -0.045%, Ti: 0.055-0.080%, N less than or equal to 0.0040%, O less than or equal to 0.0035%, and the balance of Fe and inevitable impurity elements;
the chemical composition also needs to satisfy that [ Ti ] -3.42[ N ] -3[ S ] is more than or equal to 0.040%;
the thickness range of the plate is 1.5-6.0 mm;
the microstructure of the steel plate is quasi-polygonal ferrite and pearlite, and the pearlite content is 3% -5%.
2. The hot-rolled high-strength weathering steel plate of the 600MPa grade of yield strength according to claim 1, characterized by a ferrite average grain size of 5.5 μm.
3. The hot-rolled high-strength weather-resistant steel plate with the yield strength of 600MPa according to claim 1, wherein I is more than or equal to 6.0, and is 26.01 (% Cu) +3.88 (% Ni) +1.20 (% Cr) +1.49 (% Si) +17.28 (% P) -7.29 (% Cu) x (% Ni) -9.10 (% Ni) x (% P) -33.39 (% Cu)2。
4. The hot-rolled high-strength weather-resistant steel plate with yield strength of 600MPa as claimed in claim 1, wherein the yield strength R of the steel plate iseLMore than or equal to 600MPa, tensile strength Rm more than or equal to 650MPa and elongation A more than or equal to 22 percent.
5. A production method of a hot-rolled high-strength weather-resistant steel plate with yield strength of 600MPa is characterized by comprising the following steps:
s1, smelting molten steel;
s2, refining in duplex mode by 'LF + RH';
s3, continuous casting;
s4, heating by a heating furnace;
s5, rolling;
s6, cooling by dense laminar flow, wherein the cooling speed is more than or equal to 30 ℃/S;
s7, coiling;
and S8, finishing.
6. The method for producing the hot-rolled high-strength weather-resistant steel plate with the yield strength of 600MPa according to the claim 5, wherein in the step S2, RH vacuum deep degassing is not less than 16 min.
7. The method for producing the hot-rolled high-strength weather-resistant steel plate with the yield strength of 600MPa according to claim 5, wherein in the step S4, the temperature of the continuous casting plate blank in the heating furnace is more than or equal to 500 ℃, the temperature of the first heating outlet of the heating furnace is less than 1000 ℃, the temperature is increased to 1200 ℃ at a high speed, and the temperature of the soaking section is more than or equal to 1230 ℃.
8. The method for producing the hot-rolled high-strength weather-resistant steel plate with the yield strength of 600MPa according to the claim 5, wherein in the step S4, the time of the second plus soaking is less than 100min, and the air excess coefficient of the heating furnace is less than 1.0.
9. The method for producing the hot-rolled high-strength weather-resistant steel plate with the yield strength of 600MPa according to claim 5, wherein the step S5 comprises rough rolling and finish rolling, the rough rolling temperature is controlled to be above 1050 ℃, and the cumulative reduction rate is more than or equal to 80%; the initial rolling temperature of the finish rolling is less than or equal to 1030 ℃, the accumulated deformation is more than or equal to 85%, and the finish rolling temperature is 860-920 ℃.
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