CN113652599A - High-strength corrosion-resistant cold-resistant hot-rolled steel coil and production method and application thereof - Google Patents
High-strength corrosion-resistant cold-resistant hot-rolled steel coil and production method and application 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- 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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- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/04—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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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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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Abstract
The invention relates to the technical field of hot rolled steel coils, and particularly discloses a high-strength corrosion-resistant cold-resistant hot rolled steel coil and a production method and application thereof. The high-strength corrosion-resistant cold-resistant hot-rolled steel coil comprises the following components in percentage by weight: c:0.15 to 0.20 percent of Si, less than or equal to 0.1 percent of Mn, 0.025 to 0.055 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, 0.02 to 0.06 percent of ALs, 0.025 to 0.050 percent of Ti, 0.10 to 0.20 percent of Cu, 0.30 to 0.60 percent of Cr, V:0.01 to 0.03 percent, and the balance of iron and inevitable impurities. According to the invention, elements such as titanium, copper, vanadium, chromium, manganese and the like are added into steel, so that the hot-rolled steel coil has excellent deformation performance and also has high-strength corrosion-resistant and cold-resistant effects.
Description
Technical Field
The invention relates to the technical field of hot rolled steel coils, in particular to a high-strength corrosion-resistant cold-resistant hot rolled steel coil and a production method and application thereof.
Background
As a new electric energy production mode, photovoltaic power generation shows a comparatively wide development space and application prospect by the characteristics of no pollution, no noise, simple maintenance and the like, and is the most potential green energy. At present, in the photovoltaic power generation industry, the solar bracket mainly uses carbon structural steel Q235B, SS400 and the like, and cracks are easily generated due to poor plasticity in the process of processing deformation, so that the yield of the solar bracket is influenced. Because photovoltaic power generation's construction scale is great, and the photovoltaic support that uses is more, and photovoltaic power generation place's environment is abominable moreover under general condition, and the natural environment that it was in is mostly high temperature, high and cold, many sand blown by the wind etc. so still need consider its bearing capacity, wind load, snow load, cold-resistant corrosion-resistant performance such as in the selection solar rack. Therefore, in order to prolong the service life of the solar bracket, it is important to research a solar bracket which not only has excellent deformation performance, but also has high strength, corrosion resistance and cold resistance.
Disclosure of Invention
The invention provides a high-strength corrosion-resistant cold-resistant hot-rolled steel coil, aiming at the problems that the existing solar bracket has poor deformation performance and cold and corrosion resistance and cannot meet the environmental requirements.
And a production method of the high-strength corrosion-resistant cold-resistant hot rolled steel coil.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
the high-strength corrosion-resistant cold-resistant hot-rolled steel coil comprises the following components in percentage by weight: c:0.15 to 0.20 percent of Si, less than or equal to 0.1 percent of Mn, 0.025 to 0.055 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, 0.02 to 0.06 percent of ALs, 0.025 to 0.050 percent of Ti, 0.10 to 0.20 percent of Cu, 0.30 to 0.60 percent of Cr, V:0.01 to 0.03 percent, and the balance of iron and inevitable impurities.
Compared with the prior art, the high-strength corrosion-resistant cold-resistant hot rolled steel coil provided by the invention has the following advantages:
according to the method, the titanium is added into the steel, the growth of austenite grains can be retarded in a welding heat affected zone, so that the welding performance of the steel is effectively improved, the form of sulfides is improved, the toughness of the steel is obviously improved, the hot rolled steel coil is prevented from deforming in the processing process, and the low-temperature resistance and impact resistance of the steel coil are enhanced and improved by adding the vanadium; meanwhile, elements of copper and chromium are added, so that the strength and corrosion resistance of the steel are effectively improved, and the service life of the high-strength corrosion-resistant cold-resistant hot-rolled steel coil is prolonged.
According to the method, elements such as titanium, copper, vanadium, chromium and manganese are added into steel, and the content of the elements is controlled, so that the hot-rolled steel coil has excellent deformation performance and high-strength corrosion-resistant and cold-resistant effects, the yield strength is more than or equal to 235MPa, the tensile strength reaches 370-500 MPa, the elongation rate reaches more than or equal to 26%, the impact work at-20 ℃ is more than 50J, and the hot-rolled steel coil can be used for preparing solar supports used in severe environments such as high temperature, high cold and windy sand.
The production method comprises the steps of converter vanadium extraction, converter smelting, LF refining, continuous casting to obtain a plate blank, heating the plate blank, high-pressure water descaling, rolling, cooling and coiling to obtain the high-strength corrosion-resistant cold-resistant hot-rolled steel coil.
The method for extracting vanadium by the converter, smelting by the converter and refining LF is not particularly limited, and the technical scheme familiar to the technical personnel in the field can be adopted.
Preferably, the heating temperature of the plate blank is 1200-1260 ℃, and the heating time is 120-200 min.
Preferably, when the thickness of the hot-rolled steel coil is 3-6 mm, the heating temperature of the plate blank is 1200-1230 ℃, and the heating time is 120-150 min.
Further preferably, when the thickness of the hot-rolled steel coil is 6-12 mm, the heating temperature of the plate blank is 1210-1250 ℃, and the heating time is 130-160 min.
Further preferably, when the thickness of the hot-rolled steel coil is 12 mm-16 mm, the heating temperature of the plate blank is 1220-1260 ℃, and the heating time is 150 min-200 min.
According to the invention, by regulating and controlling the heating temperature of the plate blank, the hot rolled steel coil with excellent mechanical properties is obtained by smelting each component added with elements such as titanium, copper, vanadium, chromium, manganese and the like in a converter, LF refining and continuous casting to obtain the plate blank, and heating the plate blank, so that the hot rolled steel coil has high impact resistance at low temperature, and the deformation of the hot rolled steel coil in the processing process is effectively avoided.
Preferably, the rolling includes rough rolling and finish rolling.
Further preferably, the rough rolling is five-pass rolling, and the outlet temperature of the rough rolling is 1040-1100 ℃.
More preferably, the finish rolling is seven passes, and the outlet temperature of the finish rolling is 860 to 900 ℃.
The invention preferably adopts the process parameters of rough rolling and finish rolling, and can obtain the high-strength corrosion-resistant cold-resistant hot-rolled steel coil with more excellent mechanical property.
Preferably, the thickness of the plate blank is 180-250 mm.
In the invention, the specification of the slab is not particularly limited in the continuous casting process, and a person skilled in the art can set the specification of the slab according to actual production requirements, wherein the thickness of the slab is preferably 180-250 mm, and more preferably 200 mm.
Preferably, the temperature of the curling is 580 to 640 ℃.
Preferably, in the step of descaling with high-pressure water, the pressure of the high-pressure water is 18 to 22 MPa.
In order to ensure the descaling effect on the heated plate blank, the pressure of high-pressure water is preferably 20 MPa.
Further, the invention also provides the application of the high-strength corrosion-resistant and cold-resistant hot rolled steel coil or the product for high-strength corrosion-resistant and cold-resistant hot rolled steel coil in high-temperature, high-cold and windy-sandy environments, which is prepared by the production method of the high-strength corrosion-resistant and cold-resistant hot rolled steel coil.
The application provides a high strength corrosion resistant cold resistant hot rolled steel coil is through the selection and the ratio of regulation and control each composition to through process parameter's control, make it have excellent low temperature impact property, corrosion resisting property and cold resistance, satisfy and be used for the operation requirement of high temperature, high and cold, product for the windy and sandy environment, increase of service life.
Further preferably, the high-strength corrosion-resistant and cold-resistant hot rolled steel coil or the high-strength corrosion-resistant and cold-resistant hot rolled steel coil prepared by the production method of the high-strength corrosion-resistant and cold-resistant hot rolled steel coil is applied to a solar support.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The embodiment provides a high-strength corrosion-resistant cold-resistant hot-rolled steel coil which comprises the following components in percentage by weight: 0.15% of C, 0.1% of Si, 0.025% of Mn, 0.020% of P, 0.010% of S, 0.02% of ALs, 0.025% of Ti, 0.1% of Cu, 0.3% of Cr, 0.01% of V, and the balance of Fe and inevitable impurities.
The production method of the high-strength corrosion-resistant cold-resistant hot rolled steel coil comprises the following steps:
extracting vanadium by a 150-ton converter, smelting by the 150-ton converter, LF refining and continuous casting to obtain a plate blank with the thickness of 200 mm;
placing the plate blank in a heating furnace for heating for 120min at 1200 ℃;
taking the plate blank out of the heating furnace, and descaling by high-pressure water with the pressure of 20 MPa;
rolling the plate blank by a rough rolling mill for 5 times, wherein the outlet temperature of the rough rolling mill is 1040 ℃;
and then, the plate blank passes through a hot coil box and is subjected to finish rolling for 7 times by a finish rolling machine, the outlet temperature of the finish rolling is 860 ℃, and then the plate blank is subjected to dispersive cooling and curling at 580 ℃ to obtain a high-strength corrosion-resistant cold-resistant hot-rolled steel coil with the thickness of 3.0mm and the width of 1250 m.
Example 2
The embodiment provides a high-strength corrosion-resistant cold-resistant hot-rolled steel coil which comprises the following components in percentage by weight: 0.20% of C, 0.08% of Si, 0.055% of Mn, 0.018% of P, 0.008% of S, 0.06% of ALs, 0.050% of Ti, 0.2% of Cu, 0.6% of Cr, 0.03% of V, and the balance of Fe and inevitable impurities.
The production method of the high-strength corrosion-resistant cold-resistant hot rolled steel coil comprises the following steps:
extracting vanadium by a 150-ton converter, smelting by the 150-ton converter, LF refining and continuous casting to obtain a plate blank with the thickness of 200 mm;
heating the plate blank in a heating furnace at 1260 ℃ for 200 min;
taking the plate blank out of the heating furnace, and descaling by high-pressure water with the pressure of 20 MPa;
rolling the plate blank by a rough rolling mill for 5 times, wherein the outlet temperature of the rough rolling is 1100 ℃;
and then, the plate blank passes through a coil box and is subjected to finish rolling for 7 times by a finish rolling machine, the outlet temperature of the finish rolling is 900 ℃, and then the plate blank is subjected to dispersive cooling and 620 ℃ curling to obtain a high-strength corrosion-resistant cold-resistant hot-rolled steel coil with the thickness of 16.0mm and the width of 1250 m.
Example 3
The embodiment provides a high-strength corrosion-resistant cold-resistant hot-rolled steel coil which comprises the following components in percentage by weight: 0.18% of C, 0.05% of Si, 0.040% of Mn, 0.015% of P, 0.007% of S, 0.05% of ALs, 0.040% of Ti, 0.2% of Cu, 0.5% of Cr, 0.02% of V, and the balance of iron and inevitable impurities.
The production method of the high-strength corrosion-resistant cold-resistant hot rolled steel coil comprises the following steps:
extracting vanadium by a 150-ton converter, smelting by the 150-ton converter, LF refining and continuous casting to obtain a plate blank with the thickness of 200 mm;
placing the plate blank in a heating furnace for heating for 130min at 1240 ℃;
taking the plate blank out of the heating furnace, and descaling by high-pressure water with the pressure of 20 MPa;
rolling the plate blank by a rough rolling mill for 5 times, wherein the outlet temperature of the rough rolling is 1060 ℃;
and then, the plate blank passes through a coil box and is subjected to finish rolling for 7 times by a finish rolling machine, the outlet temperature of the finish rolling is 880 ℃, and then the plate blank is subjected to dispersive cooling and curling at 600 ℃ to obtain a high-strength corrosion-resistant cold-resistant hot-rolled steel coil with the thickness of 12.0mm and the width of 1250 m.
Example 4
The embodiment provides a high-strength corrosion-resistant cold-resistant hot-rolled steel coil which comprises the following components in percentage by weight: 0.19% of C, 0.06% of Si, 0.030% of Mn, 0.015% of P, 0.007% of S, 0.04% of ALs, 0.035% of Ti, 0.2% of Cu, 0.5% of Cr, 0.02% of V, and the balance of iron and inevitable impurities.
The production method of the high-strength corrosion-resistant cold-resistant hot rolled steel coil comprises the following steps:
extracting vanadium by a 150-ton converter, smelting by the 150-ton converter, LF refining and continuous casting to obtain a plate blank with the thickness of 200 mm;
placing the plate blank in a heating furnace for heating, wherein the heating time is 150min, and the heating temperature is 1250 ℃;
taking the plate blank out of the heating furnace, and descaling by high-pressure water with the pressure of 20 MPa;
rolling the plate blank by a rough rolling mill for 5 times, wherein the outlet temperature of the rough rolling is 1070 ℃;
and then, the plate blank passes through a coil box and is subjected to finish rolling for 7 times by a finish rolling machine, the outlet temperature of the finish rolling is 870 ℃, and then the plate blank is subjected to dispersive cooling and 620 ℃ curling to obtain a high-strength corrosion-resistant cold-resistant hot-rolled steel coil with the thickness of 6.0mm and the width of 1250 m.
Example 5
The embodiment provides a high-strength corrosion-resistant cold-resistant hot-rolled steel coil which comprises the following components in percentage by weight: 0.19% of C, 0.06% of Si, 0.045% of Mn, 0.017% of P, 0.005% of S, 0.04% of ALs, 0.035% of Ti, 0.1% of Cu, 0.4% of Cr, 0.02% of V, and the balance of iron and inevitable impurities.
The production method of the high-strength corrosion-resistant cold-resistant hot rolled steel coil comprises the following steps:
extracting vanadium by a 150-ton converter, smelting by the 150-ton converter, LF refining and slab continuous casting to obtain a slab with the thickness of 200 mm;
placing the plate blank in a heating furnace for heating, wherein the heating time is 150min, and the heating temperature is 1240 ℃;
taking the plate blank out of the heating furnace, and descaling by high-pressure water with the pressure of 20 MPa;
rolling the plate blank by a rough rolling mill for 5 times, wherein the outlet temperature of the rough rolling is 1080 ℃;
and then, the plate blank passes through a coil box and is subjected to finish rolling for 7 times by a finish rolling machine, the outlet temperature of the finish rolling is 880 ℃, and then the plate blank is subjected to dispersive cooling and 620 ℃ curling to obtain a high-strength corrosion-resistant cold-resistant hot-rolled steel coil with the thickness of 6.0mm and the width of 1250 m.
In order to better illustrate the characteristics of the high-strength corrosion-resistant and cold-resistant hot-rolled steel coil provided by the embodiment of the invention, the high-strength corrosion-resistant and cold-resistant hot-rolled steel coils produced in the embodiments 1 to 5 are subjected to performance testing, and the testing results are shown in the following table 1. Wherein the yield strength, the tensile strength, the elongation and the impact energy are respectively detected according to the GB/T700-2006 method; the corrosion resistance was tested according to GBT 19746-2018.
TABLE 1
As can be seen from Table 1, the yield strength of the high-strength corrosion-resistant cold-resistant hot rolled steel coil produced in the embodiment of the invention is more than or equal to 235MPa, the tensile strength reaches 370-500 MPa, the elongation is more than or equal to 26%, and the impact energy at-20 ℃ is more than 50J, so that the solar support prepared from the hot rolled steel coil can be used in severe environments such as high temperature, high cold, windy sand and the like, the bearing capacity, wind load, snow load, cold resistance and corrosion resistance of the solar support are met, and the service life is prolonged.
The corrosion rates of the high-strength corrosion-resistant cold-resistant hot rolled steel plates prepared in the embodiments 1-5 of the invention reach 1.3mm/a, which is 0.5 times of the corrosion rate of the carbon structural steel Q235B.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a high-strength corrosion resistant cold-resistant hot rolled steel coil which characterized in that: the paint comprises the following components in percentage by weight: c:0.15 to 0.20 percent of Si, less than or equal to 0.1 percent of Mn, 0.025 to 0.055 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, 0.02 to 0.06 percent of ALs, 0.025 to 0.050 percent of Ti, 0.10 to 0.20 percent of Cu, 0.30 to 0.60 percent of Cr, V:0.01 to 0.03 percent, and the balance of iron and inevitable impurities.
2. The method for producing a high-strength corrosion-resistant cold-resistant hot-rolled steel coil as claimed in claim 1, wherein: the production method comprises the steps of vanadium extraction by a converter, smelting by the converter, LF refining, continuous casting to obtain a plate blank, heating of the plate blank, high-pressure water descaling, rolling, cooling and coiling to obtain the high-strength corrosion-resistant cold-resistant hot-rolled steel coil.
3. The method for producing a high-strength corrosion-resistant cold-resistant hot-rolled steel coil as claimed in claim 2, wherein: the heating temperature of the plate blank is 1200-1260 ℃, and the heating time is 120-200 min.
4. The method for producing a high-strength corrosion-resistant cold-resistant hot-rolled steel coil as claimed in claim 2, wherein: and when the thickness of the hot-rolled steel coil is 3-6 mm, heating the plate blank at 1200-1230 ℃ for 120-150 min.
5. The method for producing a high-strength corrosion-resistant cold-resistant hot-rolled steel coil as claimed in claim 2, wherein: and when the thickness of the hot-rolled steel coil is 6-12 mm, the heating temperature of the plate blank is 1210-1250 ℃, and the heating time is 130-160 min.
6. The method for producing a high-strength corrosion-resistant cold-resistant hot-rolled steel coil as claimed in claim 2, wherein: and when the thickness of the hot-rolled steel coil is 12-16 mm, the heating temperature of the plate blank is 1220-1260 ℃, and the heating time is 150-200 min.
7. The method for producing a high-strength corrosion-resistant cold-resistant hot-rolled steel coil as claimed in claim 2, wherein: the rolling comprises rough rolling and finish rolling.
8. The method for producing a high-strength corrosion-resistant cold-resistant hot-rolled steel coil as claimed in claim 7, wherein: the rough rolling is five-pass rolling, and the outlet temperature of the rough rolling is 1040-1100 ℃; and/or
The finish rolling is 7 passes of rolling, and the outlet temperature of the finish rolling is 860-900 ℃.
9. The method for producing a high-strength corrosion-resistant cold-resistant hot-rolled steel coil as claimed in claim 2, wherein: the thickness of the plate blank is 180 mm-250 mm; and/or
The curling temperature is 580-640 ℃; and/or
In the process of descaling with high-pressure water, the pressure of the high-pressure water is 18MPa to 22 MPa.
10. The high-strength corrosion-resistant and cold-resistant hot rolled steel coil as claimed in claim 1 or the hot rolled steel coil manufactured by the production method of the high-strength corrosion-resistant and cold-resistant hot rolled steel coil as claimed in any one of claims 2 to 9, for use in products for high-temperature, high-cold and windy and sandy environments.
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