CN110863146B - High-strength corrosion-resistant flat-bulb steel and production method thereof - Google Patents
High-strength corrosion-resistant flat-bulb steel and production method thereof Download PDFInfo
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C21—METALLURGY OF IRON
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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Abstract
The invention relates to a high-strength corrosion-resistant flat bulb steel and a production method thereof, wherein the high-strength corrosion-resistant flat bulb steel comprises the following chemical components in percentage by weight: 0.050 to 0.100 percent of C, 0.10 to 0.50 percent of Si, 1.10 to 1.60 percent of Mn, 0.010 to 0.030 percent of P, less than or equal to 0.005 percent of S, 0.30 to 0.50 percent of Cu, 0.40 to 0.90 percent of Ni, 0.40 to 0.80 percent of Cr, 0.010 to 0.050 percent of Nb, 0.010 to 0.060 percent of V, 0.007 to 0.030 percent of Ti, 0.03 to 0.08 percent of Sb, 0.0080 to 0.0120 percent of N, 0.015 to 0.030 percent of Als, and the balance of Fe and inevitable impurities. The chemical components and the process of the high-strength corrosion-resistant flat-bulb steel are reasonably designed, and the finished product has excellent mechanical property and corrosion resistance.
Description
Technical Field
The invention relates to the technical field of flat bulb steel production, in particular to high-strength corrosion-resistant flat bulb steel and a production method thereof.
Background
The flat bulb steel is a special section steel and is mainly applied to the fields of ship manufacturing and bridge construction, but with the rapid development of the shipbuilding industry in recent years, the flat bulb steel gradually becomes a special name of the ship flat bulb steel, becomes an important section steel in the ship, and is mainly used as a strengthening material and a bending material. At present, most of high-strength flat-bulb steels for ships are still traditional flat-bulb steels with grades of AH32, AH36 and the like with poor corrosion resistance, the steels are mainly subjected to corrosion protection by adopting protection methods such as coatings or corrosion inhibitors, the service life of the coatings is generally 10-15 years according to different coating materials, the design service life of a ship body is generally about 25 years, the coatings and the steels are obviously mismatched and are easy to damage in the service process, particularly, pitting corrosion can occur under the action of acidic conditions, the pitting corrosion development speed is even higher than that of bare steels without coating protection, the defect positions need to be frequently subjected to spot welding maintenance or recoating, the maintenance cost is high, and the difficulty is high. In the field of steel for ship hulls, development and use of corrosion-resistant steel plates for ships have been advanced, but research on development of corrosion-resistant flat-bulb steels matched with the steel has been less.
Chinese patent with application number 201110449456.2 discloses a large-specification high-strength D40 hot-rolled flat bulb steel for ships and a production process thereof, wherein the flat bulb steel comprises the following chemical components in percentage by weight: 0.08 to 0.15 percent of C, 0.10 to 0.50 percent of Si, 1.15 to 1.75 percent of Mn, S, P is less than or equal to 0.020 percent, 0.08 to 0.15 percent of V, 0.10 to 0.50 percent of Ni, 0.01 to 0.03 percent of Ti, 0.001 to 0.01 percent of Mg, 0.001 to 0.01 percent of Ca, 0.001 to 0.01 percent of O and 0.016 to 0.025 percent of N, wherein Mn/C is greater than or equal to 14.0 percent, Ni/Mn is greater than or equal to 0.15 percent, (Mg + Ca)/O is greater than or equal to 1.0 percent, and the balance of Fe and inevitable impurities. The production process comprises the steps of feeding vanadium-nitrogen alloy wires with the diameter of 13mm and Mg-Ca alloy wires with the diameter of 10mm into molten steel at the end of vacuum, blowing argon at the bottom for stirring, and carrying out hot rolling by adopting low-temperature blank heating, finish rolling large deformation and water mist cooling after rolling. The yield strength of the steel grade is not lower than 390MPa, and the longitudinal-40 ℃ Charpy impact energy is not lower than 41J. However, the bulb steel is only a general high strength bulb steel in view of its composition, and its corrosion resistance is not high.
The Chinese patent with the application number of 201611096842.7 discloses 'a high-strength flat-bulb steel with uniform section performance and a production process thereof', wherein the steel comprises the following chemical components in percentage by mass: 0.07-0.12% of C, 0.30-0.50% of Si, 1.00-1.50% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.50-1.00% of Ni, 0.05-0.12% of V, 0.005-0.012% of Ti and 0.014-0.024% of N, wherein C/N is less than or equal to 5.5, Ti/V is less than or equal to 0.15, Mn/Ni is less than or equal to 2.0, and the balance of Fe and inevitable impurities. The yield strength of the flat bulb steel is not lower than 440MPa, the low-temperature impact energy at minus 40 ℃ is not lower than 49J, and the uniformity of the section performance is good. This patent is also a common high strength bulb steel.
The Chinese patent with the application number of 201110417082.6 discloses a flat-bulb steel with the yield strength of 590MPa and a production method thereof, wherein the flat-bulb steel comprises the following chemical components in percentage by weight: 0.06-0.11% of C, 0.17-0.37% of Si, 0.30-0.60% of Mn, less than or equal to 0.010% of S, less than or equal to 0.015% of P, 2.60-3.00% of Ni, 0.90-1.20% of Cr, 0.20-0.27% of Mo, 0.04-0.10% of V, and the balance of iron and inevitable impurities. The production method comprises the working procedures of converter smelting, external refining, square billet continuous casting, blank heating, rolling, heat treatment and the like, and has complex production process and low corrosion resistance.
The Chinese patent with the application number of 201410633226.5 discloses 'corrosion-resistant flat bulb steel for cargo oil tanks of oil tankers and a smelting process thereof', wherein the flat bulb steel comprises the following components: 0.08-0.12% of C, 0.20-0.40% of Si, 1.00-1.20% of Mn, 0.015-0.025% of P, less than or equal to 0.003% of S, 0.020-0.045% of Alt, 0.20-0.30% of Ni, 0.10-0.20% of Cr, 0.20-0.30% of Cu, 0.03-0.05% of V, 0.010-0.030% of Ti, 0.07-0.10% of Sb, 80-110 ppm of N, and the balance of Fe and inevitable impurities.
In summary, the following problems exist in the production of high-strength corrosion-resistant flat bulb steels.
1) The bulb steel component system has no corrosion resistance.
2) The flat bulb steel production process is complex.
Disclosure of Invention
The invention provides the high-strength corrosion-resistant flat bulb steel and the production method thereof, the chemical components and the process of the high-strength corrosion-resistant flat bulb steel are reasonably designed, and the finished product has excellent mechanical property and corrosion resistance.
In order to achieve the purpose, the invention adopts the following technical scheme:
the high-strength corrosion-resistant flat bulb steel comprises the following chemical components in percentage by weight: 0.050 to 0.100 percent of C, 0.10 to 0.50 percent of Si, 1.10 to 1.60 percent of Mn, 0.010 to 0.030 percent of P, less than or equal to 0.005 percent of S, 0.30 to 0.50 percent of Cu, 0.40 to 0.90 percent of Ni, 0.40 to 0.80 percent of Cr, 0.010 to 0.050 percent of Nb, 0.010 to 0.060 percent of V, 0.007 to 0.030 percent of Ti, 0.03 to 0.08 percent of Sb, 0.0080 to 0.0120 percent of N, 0.015 to 0.030 percent of Als, and the balance of Fe and inevitable impurities.
The production method of the high-strength corrosion-resistant flat-bulb steel comprises the following processes of smelting, continuous casting, heating by a heating furnace, rolling and cooling, and specifically comprises the following steps:
1) the molten steel smelting process route is as follows: molten iron pretreatment → converter smelting → LF → vacuum refining → square billet continuous casting, and nitrogen blowing treatment is carried out in a converter or a vacuum refining furnace, wherein the nitrogen blowing time is more than 10 min;
2) continuously casting the molten steel obtained in the step 1) to prepare a casting blank, and controlling the superheat degree of a tundish to be less than or equal to 30 ℃;
3) heating the casting blank obtained in the step 2), wherein the heating temperature is 1150-1250 ℃, and the heat preservation time is 30-300 min;
4) rolling the casting blank heated in the step 3), wherein the rolling process comprises three stages of rough rolling, intermediate rolling and finish rolling, and the control process parameters are as follows:
a) rough rolling; rolling the casting blank into a blank for flat steel intermediate rolling in 5-9 passes, wherein the initial rolling temperature of rough rolling is 1080-1180 ℃;
b) intermediate rolling; rolling the blank obtained in the step a) for 3-5 times, widening the blank at the stage, and distributing the metal amount of the ball head and the web plate; the initial rolling temperature of the intermediate rolling is 950-1050 ℃;
c) fine rolling; rolling the blank obtained in the step b) for 2-6 times to obtain flat-bulb steel; the finish rolling temperature is as follows: 830-940 ℃ of web plate; the ball head is 900-980 ℃;
5) cooling after rolling; cooling the rolled flat-bulb steel by spraying water, and adjusting the cooling speed of a web plate and a bulb of the flat-bulb steel to ensure that the final cooling temperature is consistent; the cooling temperature: web 820-890 ℃; the ball head is 880-950 ℃; cooling rate: the web plate is 10.0 ℃/s-14.0 ℃/s; the ball head is 13.0 ℃/s-16.0 ℃/s; final cooling temperature: 450-500 ℃;
6) air cooling the flat-bulb steel obtained in the step 5) to below 80 ℃, and then straightening to obtain a flat-bulb steel finished product.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, through reasonably designing the chemical components of the flat-bulb steel, designing the production process matched with the flat-bulb steel and adopting the processes of respectively controlling the cooling of the bulb and the web, the problem of uneven temperature caused by uneven section size of the flat-bulb steel is solved, and the uniformity of the mechanical property of the section is improved. Finally, the flat-bulb steel with excellent mechanical property and corrosion resistance is obtained, the yield strength is more than 400MPa, the impact absorption energy at minus 40 ℃ is more than 100J, and the corrosion rate is far less than that of the flat-bulb steel with the same strength grade in the marine environment.
Detailed Description
The invention relates to a high-strength corrosion-resistant flat bulb steel, which comprises the following chemical components in percentage by weight: 0.050 to 0.100 percent of C, 0.10 to 0.50 percent of Si, 1.10 to 1.60 percent of Mn, 0.010 to 0.030 percent of P, less than or equal to 0.005 percent of S, 0.30 to 0.50 percent of Cu, 0.40 to 0.90 percent of Ni, 0.40 to 0.80 percent of Cr, 0.010 to 0.050 percent of Nb, 0.010 to 0.060 percent of V, 0.007 to 0.030 percent of Ti, 0.03 to 0.08 percent of Sb, 0.0080 to 0.0120 percent of N, 0.015 to 0.030 percent of Als, and the balance of Fe and inevitable impurities.
The invention relates to a production method of high-strength corrosion-resistant flat-bulb steel, which comprises the following processes of smelting, continuous casting, heating by a heating furnace, rolling and cooling, and specifically comprises the following steps:
1) the molten steel smelting process route is as follows: molten iron pretreatment → converter smelting → LF → vacuum refining → billet continuous casting, and nitrogen blowing treatment is carried out in a converter or a vacuum refining furnace, wherein the nitrogen blowing time is more than 10min, so as to control the nitrogen content in the smelting steel.
2) Continuously casting the molten steel obtained in the step 1) to prepare a casting blank, and controlling the superheat degree of a tundish to be less than or equal to 30 ℃;
3) heating the casting blank obtained in the step 2), wherein the heating temperature is 1150-1250 ℃, and the heat preservation time is 30-300 min;
4) rolling the casting blank heated in the step 3), wherein the rolling process comprises three stages of rough rolling, intermediate rolling and finish rolling, and the control process parameters are as follows:
a) rough rolling; rolling the casting blank into a blank for flat steel intermediate rolling in 5-9 passes, wherein the initial rolling temperature of rough rolling is 1080-1180 ℃;
b) intermediate rolling; rolling the blank obtained in the step a) for 3-5 times, widening the blank at the stage, and distributing the metal amount of the ball head and the web plate; the initial rolling temperature of the intermediate rolling is 950-1050 ℃;
c) fine rolling; rolling the blank obtained in the step b) for 2-6 times to obtain flat-bulb steel; the finish rolling temperature is as follows: 830-940 ℃ of web plate; the ball head is 900-980 ℃;
5) cooling after rolling; the rolled flat-bulb steel is cooled by spraying water, and the final cooling temperature is consistent by adjusting the cooling speed of a web plate and a bulb of the flat-bulb steel, so that the problems of deformation and the like of the symmetrical flat-bulb steel caused by uneven cooling are prevented; the cooling temperature: web 820-890 ℃; the ball head is 880-950 ℃; cooling rate: the web plate is 10.0 ℃/s-14.0 ℃/s; the ball head is 13.0 ℃/s-16.0 ℃/s; final cooling temperature: 450-500 ℃;
6) air cooling the flat-bulb steel obtained in the step 5) to below 80 ℃, and then straightening to obtain a flat-bulb steel finished product.
The design principle and the effect of each chemical component in the high-strength corrosion-resistant flat bulb steel are as follows:
c: the main strengthening elements in the alloy steel can reduce the generation amount of carbide when the content of the main strengthening elements is low, and influence the effect of refining grains during rolling to reduce the strength. When the content is higher, the pearlite structure content in the steel is increased, the low-temperature toughness and the welding performance of the steel plate are not good, and the electrochemical corrosion of the steel is increased because the electric potential of the cementite electrode is higher than that of a ferrite motor. Therefore, the invention comprehensively considers the factors of cost, performance and the like, and the range of the control C is 0.050 to 0.10 percent.
Si: the necessary elements for steelmaking deoxidization have strong solid solution capability in steel, can play a certain role in strengthening, and meanwhile, silicon can improve the corrosion resistance of the steel, has a good corrosion resistance effect particularly in a damp and hot marine environment, but the low-temperature toughness and the welding performance of the steel can be seriously damaged due to the excessively high content of the elements. The invention controls the range of Si to be 0.10-0.50%.
Mn: effective elements for improving the strength and the toughness of steel, and proper Mn can delay the transformation of ferrite and pearlite of steel grades, greatly increase the hardenability of the steel grades, reduce the brittle transformation temperature of steel and improve the impact toughness. However, when the content is too high, segregation is likely to occur, which is disadvantageous in corrosion resistance of steel. The invention controls the range of Mn to be 1.10-1.60%.
P: improve the marine environment corrosion resistance of the steel, can form various composite salts in the coexistence of Cu element, ensures that the crystal grains of the inner rust layer are fine and compact, and can resist Cl-The corrosion rate of the steel is reduced, but too high a content is detrimental to the low temperature toughness and weldability of the steel. The range of P control of the invention is 0.010 percent to 0.030 percent.
S: harmful elements in the steel have adverse effects on the properties of the steel, such as low-temperature toughness, corrosion resistance and the like. The range of S is controlled to be less than or equal to 0.005 percent.
Cu: the corrosion resistance of the steel can be obviously improved, and various composite salts can be formed by the steel and the P, so that the corrosion resistance of the steel is further improved; meanwhile, the strength and the low-temperature toughness of the steel can be improved. The invention controls the Cu range to be 0.30-0.50%.
Ni: the corrosion resistance of the steel is obviously improved, the Ni element is enriched in the rust layer near the surface of the steel, and the rust layer enriched with the alloy element has ion selective permeability and can prevent Cl < - > from permeating, so that the metal in the rust layer is protected. Meanwhile, nickel can improve the low-temperature toughness of the steel. However, the addition of a large amount of nickel causes a considerable increase in the cost of steel due to its high price. The invention controls the range of Ni to be 0.40-0.90%.
Cr: the medium-strength carbide forming element can form carbide with carbon in steel and can also be dissolved in solid solution and Fe3C, so that the strength and the wear resistance of the steel are improved, and the addition of Cr is also beneficial to improving the corrosion resistance of the steel. The addition amount is too high, which increases the cost of steel. The invention controls the range of Cr to be 0.40-0.80%.
Nb: grain refining elements, wherein carbon and nitride particles of the Nb which are not dissolved during heating are distributed on austenite grain boundaries, so that the growth of austenite grains of the steel during heating can be prevented; can effectively delay the recrystallization of the deformed austenite, prevent the austenite grains from growing, refine the ferrite grains and improve the strength and the toughness of the steel. The range of Nb control of the invention is 0.010 percent to 0.050 percent.
V: the austenite is separated out, so that austenite grains can be refined; meanwhile, the interface energy of the precipitated particles and ferrite is small, ferrite nucleation is promoted, and the functions of inducing ferrite nucleation in crystal and refining ferrite grains can be achieved. In addition, V is dispersed and precipitated in ferrite, so that the precipitation strengthening effect can be achieved, the strength of the steel is further improved, and the dispersed and precipitated V plays a vital role in improving the uniformity of the section performance of the flat-bulb steel. The range of V control of the invention is 0.010% -0.060%.
Ti: the precipitation strengthening elements in the microalloy steel are combined with N in a high-temperature region to form stable TiN particles, so that the growth of austenite particles can be effectively prevented, but the TiN particles in the steel are coarse due to too high content, and the low-temperature performance of the steel is influenced. The invention controls the range of Ti to be 0.007-0.030%.
Sb: the mechanical properties of the steel are adversely affected, the strength of the steel is generally reduced, and the brittleness of the steel is generally increased, but if a certain amount of antimony is added into the steel, the corrosion resistance and the wear resistance of the steel are improved to different degrees. The Sb content is controlled to be 0.03-0.08%.
N: the steel is combined with Nb, V and Ti in the steel to form second phase particles to be precipitated, most of V does not fully exert the precipitation strengthening effect under the condition of lacking N in the steel containing V, the condition can be changed by adding N, and meanwhile, the addition of N is beneficial to improving the section performance uniformity of the flat-bulb steel. The invention controls the range of N to be 0.0080-0.0120%.
Al: the strong deoxidizer produces highly fine and ultra-microscopic oxides in steel, and plays a role in refining grains. The invention controls the range of Als to be 0.015-0.030%.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
In the embodiment, the chemical components of the high-strength corrosion-resistant flat-bulb steel are shown in table 1, and the smelting process parameters are shown in table 2.
TABLE 1 chemical composition of steel (wt%)
TABLE 2 smelting Process parameters of the steels
| Numbering | Nitrogen blowing time/min | Degree of superheat/. degree.C |
| 1 | 15 | 20 |
| 2 | 20 | 23 |
| 3 | 18 | 25 |
| 4 | 23 | 22 |
| 5 | 25 | 24 |
Casting the steel into a casting blank, and heating, rolling, cooling and the like to obtain the flat-bulb steel. The heating and rolling process parameters are shown in table 3, and the cooling process parameters are shown in table 4.
TABLE 3 heating and Rolling Process parameters of the bulb Flat Steel
TABLE 4 Cooling Process parameters of the bulb Flat Steel
In this example, the mechanical properties of the flat bulb steel are shown in table 5.
TABLE 5 mechanical Properties of the bulb Steel
The corrosion resistance test was performed on the flat bulb steel produced in this example, the corrosion environment being a marine environment, and as a comparative example, the test was also performed on a general flat bulb steel of the same strength grade at the same time, and the test results are shown in table 6.
TABLE 6 Corrosion resistance and comparison of the flat bulb steels
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (1)
1. The production method of the high-strength corrosion-resistant flat-bulb steel is characterized in that the high-strength corrosion-resistant flat-bulb steel comprises the following chemical components in percentage by weight: 0.050 to 0.100 percent of C, 0.10 to 0.50 percent of Si, 1.10 to 1.60 percent of Mn, 0.010 to 0.030 percent of P, less than or equal to 0.005 percent of S, 0.30 to 0.50 percent of Cu, 0.40 to 0.90 percent of Ni, 0.40 to 0.80 percent of Cr, 0.010 to 0.050 percent of Nb, 0.010 to 0.060 percent of V, 0.007 to 0.030 percent of Ti, 0.03 to 0.08 percent of Sb, 0.0080 to 0.0120 percent of N, 0.015 to 0.030 percent of Als, and the balance of Fe and inevitable impurities;
the production method of the high-strength corrosion-resistant flat-bulb steel comprises the following processes of smelting, continuous casting, heating by a heating furnace, rolling and cooling, and specifically comprises the following steps:
1) the molten steel smelting process route is as follows: molten iron pretreatment → converter smelting → LF → vacuum refining, and nitrogen blowing treatment is carried out in a converter or a vacuum refining furnace, wherein the nitrogen blowing time is more than 10 min;
2) continuously casting the molten steel obtained in the step 1) to prepare a casting blank, and controlling the superheat degree of a tundish to be less than or equal to 30 ℃;
3) heating the casting blank obtained in the step 2), wherein the heating temperature is 1150-1250 ℃, and the heat preservation time is 30-300 min;
4) rolling the casting blank heated in the step 3), wherein the rolling process comprises three stages of rough rolling, intermediate rolling and finish rolling, and the control process parameters are as follows:
a) rough rolling; rolling the casting blank into a blank for flat steel intermediate rolling in 5-9 passes, wherein the initial rolling temperature of rough rolling is 1080-1180 ℃;
b) intermediate rolling; rolling the blank obtained in the step a) for 3-5 times, widening the blank at the stage, and distributing the metal amount of the ball head and the web plate; the initial rolling temperature of the intermediate rolling is 950-1050 ℃;
c) fine rolling; rolling the blank obtained in the step b) for 2-6 times to obtain flat-bulb steel; the finish rolling temperature is as follows: 830-940 ℃ of web plate; the ball head is 900-980 ℃;
5) cooling after rolling; cooling the rolled flat-bulb steel by spraying water, and adjusting the cooling speed of a web plate and a bulb of the flat-bulb steel to ensure that the final cooling temperature is consistent; the cooling temperature: web 820-890 ℃; the ball head is 880-950 ℃; cooling rate: the web plate is 10.0 ℃/s-14.0 ℃/s; the ball head is 13.0 ℃/s-16.0 ℃/s; final cooling temperature: 450-500 ℃;
6) air cooling the flat-bulb steel obtained in the step 5) to below 80 ℃, and then straightening to obtain a flat-bulb steel finished product.
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| CN112626308A (en) * | 2020-12-25 | 2021-04-09 | 常州东方特钢有限公司 | Production process of high-quality asymmetric flat-bulb steel produced by adding NbN |
| CN114517254B (en) * | 2022-02-28 | 2023-04-25 | 南京工程学院 | Low-temperature-resistant flat bulb steel for ship and preparation method thereof |
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