CN113046652B - 420 MPa-grade weather-proof bridge steel and manufacturing method thereof - Google Patents
420 MPa-grade weather-proof bridge steel and manufacturing method thereof Download PDFInfo
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- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention discloses 420 MPa-grade weather-proof bridge steel and a manufacturing method thereof, relating to the technical field of steel production, and comprising the following chemical components in percentage by mass: c: 0.07 to 0.10 percent of Si: 0.20-0.30%, Mn: 1.20% -1.30%, P: 0.005-0.015 percent, less than or equal to 0.0020 percent of S, Nb: 0.010-0.020%, V is less than or equal to 0.10%, Ti: 0.006-0.020%, Cr: 0.20-0.40%, Ni: 0.30% -0.40%, Mo is less than or equal to 0.1%, Cu: 0.20-0.30%, B is less than or equal to 0.0005%, Al: 0.015% -0.030%, Mg: 0.0012 to 0.0020 percent, less than or equal to 0.0050 percent of N, more than or equal to 6.5 percent of I, no Ca, and the balance of Fe and impurities. Forming multi-phase structure with acicular ferrite as main component, improving strength and toughness of product and improving welding performance.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to 420 MPa-grade weather-proof bridge steel and a manufacturing method thereof.
Background
With the development of transformation of macroscopic economy, China greatly promotes the construction of traffic infrastructures such as steel structure bridges and the like, and the use amount of bridge structure products is greatly increased. The steel for bridge structure has more and more strict requirements on the quality of products, and the purity and weldability of the molten steel of the steel for bridge are the key points of whether the products can meet the key national projects.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides 420 MPa-grade weather-proof bridge steel which comprises the following chemical components in percentage by mass: c: 0.07 to 0.10 percent of Si: 0.20-0.30%, Mn: 1.20% -1.30%, P: 0.005-0.015 percent, less than or equal to 0.0020 percent of S, Nb: 0.010-0.020%, V is less than or equal to 0.10%, Ti: 0.006-0.020%, Cr: 0.20-0.40%, Ni: 0.30% -0.40%, Mo is less than or equal to 0.1%, Cu: 0.20-0.30%, B is less than or equal to 0.0005%, Al: 0.015% -0.030%, Mg: 0.0012 to 0.0020 percent, less than or equal to 0.0050 percent of N, more than or equal to 6.5 percent of I, no Ca, and the balance of Fe and impurities.
The technical scheme of the invention is further defined as follows:
the 420 MPa-grade weather-proof bridge steel comprises the following chemical components in percentage by mass: c: 0.07 to 0.9 percent of Si: 0.20-0.29%, Mn: 1.20% -1.29%, P: 0.005-0.013%, S is less than or equal to 0.0018%, Nb: 0.010-0.018%, V is less than or equal to 0.10%, Ti: 0.006% -0.019%, Cr: 0.20-0.30%, Ni: 0.30% -0.35%, Mo is less than or equal to 0.1%, Cu: 0.20-0.25%, B is less than or equal to 0.0005%, Al: 0.015% -0.029%, Mg: 0.0012 to 0.0019 percent, less than or equal to 0.0050 percent of N, more than or equal to 6.5 percent of I, no Ca, and the balance of Fe and impurities.
The 420 MPa-grade weather-proof bridge steel comprises the following chemical components in percentage by mass: c: 0.075-0.95%, Si: 0.22-0.28%, Mn: 1.20% -1.30%, P: 0.008-0.013%, S is less than or equal to 0.0020%, Nb: 0.010-0.020%, V is less than or equal to 0.10%, Ti: 0.006-0.020%, Cr: 0.25% -0.35%, Ni: 0.30% -0.40%, Mo is less than or equal to 0.1%, Cu: 0.20-0.30%, B is less than or equal to 0.0005%, Al: 0.018-0.029% of Mg: 0.0012 to 0.0020 percent, less than or equal to 0.0050 percent of N, more than or equal to 6.5 percent of I, no Ca, and the balance of Fe and impurities.
The 420 MPa-grade weather-proof bridge steel comprises the following chemical components in percentage by mass: c: 0.08-0.10%, Si: 0.21-0.30%, Mn: 1.21% -1.30%, P: 0.008-0.015%, S is less than or equal to 0.0020%, Nb: 0.011 percent to 0.020 percent, V is less than or equal to 0.10 percent, Ti: 0.008-0.020%, Cr: 0.30% -0.40%, Ni: 0.30% -0.39%, Mo is less than or equal to 0.1%, Cu: 0.21-0.30%, B is less than or equal to 0.0005%, Al: 0.018-0.030%, Mg: 0.0012 to 0.0020 percent, less than or equal to 0.0050 percent of N, more than or equal to 6.5 percent of I, no Ca, and the balance of Fe and impurities.
The invention also aims to provide a manufacturing method of the 420 MPa-grade weather-proof bridge steel, which comprises the following steps:
s1, performing desulfurization pretreatment on molten iron by a KR method, skimming slag, and blowing in a converter;
s2, adopting self-produced waste steel and sulfur-free waste steel, feeding nickel alloy into a furnace together with the waste steel, tapping the steel in the converter at the temperature of 1640-1680 ℃, and adding ferromanganese, ferrosilicon and aluminum blocks for deoxidation alloying;
s3, adjusting argon blowing at the bottom of a steel ladle after molten steel reaches an LF furnace, electrifying to raise the temperature, melting slag by using lime and aluminum wires, sampling and analyzing white slag of furnace slag, continuously adding lime and the aluminum wires according to a sample for desulfurization, carrying out alloying treatment after desulfurization is finished, carrying out molten steel oxygen determination operation with the aluminum content of 0.030-0.050% and the oxygen content of less than or equal to 5ppm, carrying out precipitation deoxidation by using magnesium-aluminum composite alloy after the oxygen determination is finished, and hoisting the molten steel to RH for vacuum treatment;
s4, carrying out vacuum treatment when the molten steel reaches RH, wherein the vacuum keeping time is more than or equal to 15min, and hoisting to be continuously cast after the vacuum treatment is finished;
s5, adopting a ventilating water gap for continuous casting to ensure smooth casting, adopting the processes of electromagnetic stirring and dynamic soft reduction, checking the surface quality of the blank after the blank is cooled in a heap for 48 hours, and processing to ensure that the surface quality meets the requirements;
s6, heating the qualified blank in a stepping heating furnace, wherein the austenitizing temperature is set to 1180 +/-10 ℃, the heating time is calculated according to the thickness of the blank by 9-12 min/cm, and the soaking time is more than or equal to 35 min;
s7, rolling by using a single-stand reversible rolling mill, wherein the initial rolling temperature of the initial rolling is 1050-1110 ℃, the secondary rolling temperature is 800-980 ℃, the final rolling temperature is 700-850 ℃, the water inlet temperature is 740-790 ℃, the red return temperature is 550-650 ℃, and the steel plate is directly subjected to thermal straightening after being cooled;
and S8, cooling the steel plate to normal temperature, and carrying out delivery treatment after shearing, surface inspection, marking and flaw detection are qualified.
In the manufacturing method of 420 MPa-grade weather-resistant bridge steel, in the step S3, the magnesium content of the magnesium-aluminum alloy is 20-30%.
The invention has the beneficial effects that:
(1) the invention adopts a top-bottom combined blown converter for smelting, adopts microalloying technology to refine impurities and reduce the original austenite grain size after refining treatment, adopts TMCP rolling technology to solve the problem of molten steel cleanliness of bridge steel, utilizes the strong chemical activity of high vapor pressure and low melting point of magnesium element at the molten steel smelting temperature to produce fine and dispersed magnesium impurities after magnesium treatment, and ensures that the grain size of the product reaches more than 11 grades, thereby forming a multiphase structure taking acicular ferrite as a main component, improving the strength and toughness of the product and improving the welding performance;
(2) according to the invention, the corrosion resistance index of the low alloy steel is improved and the weather resistance of the product is improved by setting the component ranges of Cu, Ni, Cr, Si and P;
(3) in the invention, KR method is adopted for desulfurization, thus ensuring the desulfurization and slagging efficiency, and the use of self-produced scrap steel avoids smelting and sulfur increase;
(4) the converter alloying and LF deoxidation alloying process reduces the production quantity of aluminum inclusions, and promotes the denaturation of large inclusions in molten steel by adding the alloyed magnesium-aluminum alloy;
(5) according to the invention, through vacuum treatment, free oxygen in steel and free oxygen replaced after magnesium metallurgy are subjected to vacuum treatment, and the total oxygen content of molten steel is greatly reduced;
(6) the magnesium-treated molten steel is adopted, so that long-strip-shaped inclusions of manganese sulfide in the steel are eliminated, magnesium sulfide spheroidized inclusions are generated, and the quality of the molten steel is improved;
(7) in the invention, the magnesium-treated molten steel is adopted to generate fine and dispersed nano-scale MgO-Al2O3Spinel and fine inclusions become nucleation cores of tissue transformation in the rolling process, a large amount of multiphase tissues mainly comprising acicular ferrite are formed, and the toughness and the welding performance of the product are effectively improved;
(8) according to the invention, the internal stress of the steel plate is reduced by a high-temperature austenitizing technology and high-temperature rolling and re-reddening processes, and the application of the structural steel is facilitated.
Drawings
FIG. 1 is a metallographic structure diagram of a steel sheet according to example 1 of the present invention.
Detailed Description
Example 1
The 420 MPa-grade weather-proof bridge steel provided by the embodiment comprises the following chemical components in percentage by mass: c: 0.09%, Si: 0.29%, Mn: 1.29%, P: 0.012%, S: 0.0016%, Nb: 0.012%, V: 0.005%, Ti: 0.019%, Cr: 0.23%, Ni: 0.33%, Mo: 0.005%, Cu: 0.27%, B: 0.0002%, Al: 0.023%, Mg: 0.0017%, N: 0.0029 percent, I is more than or equal to 6.5 percent, Ca is not added, and the balance is Fe and impurities.
The method comprises the following steps:
s1, performing desulfurization pretreatment on molten iron by a KR method, skimming slag, and blowing in a converter;
s2, adopting self-produced waste steel and sulfur-free waste steel, feeding nickel alloy into a furnace together with the waste steel, tapping the steel in the converter at 1668 ℃, and adding ferromanganese, ferrosilicon and aluminum blocks for deoxidation alloying;
s3, adjusting argon blowing at the bottom of a ladle after molten steel reaches an LF furnace, enabling the argon flow to be 350NL/min, electrifying and heating, melting slag by using lime and aluminum wires, sampling and analyzing white slag of furnace slag, continuously adding lime and the aluminum wires according to a sample for desulfurization, carrying out alloying treatment after the desulfurization is finished, carrying out molten steel oxygen determination operation with the aluminum content of 0.039% and the oxygen content of 2ppm, carrying out precipitation deoxidation by using magnesium-aluminum composite alloy after the oxygen determination is finished, wherein the magnesium content of the magnesium-aluminum alloy is 20% -30%, and hoisting the molten steel to RH for vacuum treatment;
s4, carrying out vacuum treatment when the molten steel reaches RH, keeping the vacuum for 16min, and hoisting to be continuously cast after the vacuum treatment is finished;
s5, adopting a ventilating water gap for continuous casting to ensure smooth casting, adopting the processes of electromagnetic stirring and dynamic soft reduction, checking the surface quality of the blank after the blank is cooled in a heap for 48 hours, and processing to ensure that the surface quality meets the requirements;
s6, heating the qualified blank in a stepping heating furnace, setting the austenitizing temperature to be 1188 ℃, calculating the heating time according to the thickness of the blank by 11min/cm, and carrying out soaking for 38 min;
s7, rolling by adopting a single-stand reversible rolling mill, wherein the initial rolling temperature of the initial rolling is 1080 ℃, the secondary rolling temperature is 908 ℃, the final rolling temperature is 831 ℃, the water inlet temperature is 788 ℃, the re-reddening temperature is 589 ℃, and the steel plate is directly subjected to thermal straightening after being cooled;
and S8, cooling the steel plate to normal temperature, and carrying out delivery treatment after shearing, surface inspection, marking and flaw detection are qualified.
Example 2
The difference between the 420 MPa-grade weather-resistant bridge steel provided by the embodiment and the embodiment 1 is that the steel comprises the following chemical components in percentage by mass: c: 0.081%, Si: 0.21%, Mn: 1.26%, P: 0.009%, S: 0.0013%, Nb: 0.017%, V: 0.005%, Ti: 0.015%, Cr: 0.36%, Ni: 0.37%, Mo: 0.003%, Cu: 0.26%, B: 0.0001%, Al: 0.026%, Mg: 0.0017%, N: 0.0031 percent, I is more than or equal to 6.5 percent, Ca is not added, and the balance is Fe and impurities.
The results of the mechanical property tests of the steel plates of the examples 1 and 2 are shown in the following table:
in conclusion, the invention designs a unique smelting production process on the basis of product design, changes the traditional inclusion form and is a novel manufacturing method taking magnesium deoxidation as a core. Tests show that the fine dispersed inclusions with the size not larger than 10 mu m are good nucleation points in the process of structure transformation, the product can easily form acicular ferrite, the grain size of the product can reach more than 11 grades, the toughness of the product is improved, the welding performance of the product is greatly improved, and the service performance of bridge steel is ensured.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (3)
1. The 420 MPa-grade weather-resistant bridge steel is characterized in that: the chemical components and the mass percentage are as follows: c: 0.07 to 0.10 percent of Si: 0.20-0.30%, Mn: 1.20% -1.30%, P: 0.005-0.015 percent, less than or equal to 0.0020 percent of S, Nb: 0.010-0.020%, V is less than or equal to 0.10%, Ti: 0.006-0.020%, Cr: 0.20-0.40%, Ni: 0.30% -0.40%, Mo is less than or equal to 0.1%, Cu: 0.20-0.30%, B is less than or equal to 0.0005%, Al: 0.015% -0.030%, Mg: 0.0012 to 0.0020 percent, less than or equal to 0.0050 percent of N, more than or equal to 6.5 percent of I, no Ca, and the balance of Fe and impurities;
the manufacturing method comprises the following steps:
s1, performing desulfurization pretreatment on molten iron by a KR method, skimming slag, and blowing in a converter;
s2, adopting self-produced waste steel and sulfur-free waste steel, feeding nickel alloy into a furnace together with the waste steel, tapping the steel in the converter at the temperature of 1640-1680 ℃, and adding ferromanganese, ferrosilicon and aluminum blocks for deoxidation alloying;
s3, adjusting argon blowing at the bottom of a steel ladle after molten steel reaches an LF furnace, electrifying to raise the temperature, melting slag by using lime and aluminum wires, sampling and analyzing white slag of furnace slag, continuously adding lime and the aluminum wires according to a sample for desulfurization, carrying out alloying treatment after desulfurization is finished, carrying out molten steel oxygen determination operation with the aluminum content of 0.030-0.050% and the oxygen content of less than or equal to 5ppm, carrying out precipitation deoxidation by using magnesium-aluminum composite alloy after the oxygen determination is finished, and hoisting the molten steel to RH for vacuum treatment;
s4, carrying out vacuum treatment when the molten steel reaches RH, wherein the vacuum keeping time is more than or equal to 15min, and hoisting to be continuously cast after the vacuum treatment is finished;
s5, adopting a ventilating water gap for continuous casting to ensure smooth casting, adopting the processes of electromagnetic stirring and dynamic soft reduction, checking the surface quality of the blank after the blank is cooled in a heap for 48 hours, and processing to ensure that the surface quality meets the requirements;
s6, heating the qualified blank in a stepping heating furnace, wherein the austenitizing temperature is set to 1180 +/-10 ℃, the heating time is calculated according to the thickness of the blank by 9-12 min/cm, and the soaking time is more than or equal to 35 min;
s7, rolling by using a single-stand reversible rolling mill, wherein the initial rolling temperature of the initial rolling is 1050-1110 ℃, the secondary rolling temperature is 800-980 ℃, the final rolling temperature is 700-850 ℃, the water inlet temperature is 740-790 ℃, the red return temperature is 550-650 ℃, and the steel plate is directly subjected to thermal straightening after being cooled;
and S8, cooling the steel plate to normal temperature, and carrying out delivery treatment after shearing, surface inspection, marking and flaw detection are qualified.
2. The weather-resistant bridge steel for 420MPa grade according to claim 1, wherein: the chemical components and the mass percentage are as follows: c: 0.08-0.10%, Si: 0.21-0.30%, Mn: 1.21% -1.30%, P: 0.008-0.015%, S is less than or equal to 0.0020%, Nb: 0.011 percent to 0.020 percent, V is less than or equal to 0.10 percent, Ti: 0.008-0.020%, Cr: 0.30% -0.40%, Ni: 0.30% -0.39%, Mo is less than or equal to 0.1%, Cu: 0.21-0.30%, B is less than or equal to 0.0005%, Al: 0.018-0.030%, Mg: 0.0012 to 0.0020 percent, less than or equal to 0.0050 percent of N, more than or equal to 6.5 percent of I, no Ca, and the balance of Fe and impurities.
3. The weather-resistant bridge steel for 420MPa grade according to claim 1, wherein: in the step S3, the magnesium content of the magnesium-aluminum alloy is 20-30%.
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| CN116716538A (en) * | 2023-04-26 | 2023-09-08 | 南京钢铁股份有限公司 | High-strength bridge steel and manufacturing method thereof |
| CN116516250A (en) * | 2023-04-26 | 2023-08-01 | 南京钢铁股份有限公司 | Low-cost bridge steel and manufacturing method thereof |
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