CN111057968B - Corrosion-resistant hot-rolled steel plate for street lamp pole and preparation method thereof - Google Patents
Corrosion-resistant hot-rolled steel plate for street lamp pole and preparation method thereof Download PDFInfo
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- CN111057968B CN111057968B CN201911318395.9A CN201911318395A CN111057968B CN 111057968 B CN111057968 B CN 111057968B CN 201911318395 A CN201911318395 A CN 201911318395A CN 111057968 B CN111057968 B CN 111057968B
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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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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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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- 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
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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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
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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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
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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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 relates to a corrosion-resistant hot-rolled steel plate for a street lamp post and a preparation method thereof, belongs to the field of preparation of corrosion-resistant steel plates, and solves the problem of poor corrosion resistance of hot-rolled steel plates in the prior art. The corrosion-resistant hot-rolled steel plate for the street lamp pole comprises the following chemical composition elements in percentage by mass: c: 0.02 to 0.25%, Si: 0.3 to 1.0%, Mn: 0.6-2.0%, P: 0.005-0.15%, S: 0.001 to 0.025%, Cu: 0.02-0.8%, Cr: 0.5 to 1.0%, Ni: 0.1 to 1.5%, Sn: 0-0.02%, Sb: 0-0.02%, Ca: 0.0002 to 0.01%, Re: 0.0005-0.03%, the balance being iron and other unavoidable impurity elements. The invention realizes that the hot rolled steel plate has excellent corrosion resistance and good surface adhesion performance.
Description
Technical Field
The invention relates to the technical field of preparation of corrosion-resistant steel plates, in particular to a corrosion-resistant hot-rolled steel plate for a street lamp pole and a preparation method thereof.
Background
The street lamp pole is the indispensable lighting facilities in city, and the street lamp pole exposes for a long time outdoors, contacts various harmful gas in the atmosphere and is corroded, especially along the sea area that humidity, acid rain are frequent, and the corrosion problem of street lamp pole is more serious. The traditional lamp post production method adopts the procedures of cutting, bending, welding and the like of a Q235 hot rolled plate, and then galvanization and plastic spraying are carried out. Among them, zinc plating is a conventionally effective method for preventing corrosion. But with the increase of environmental protection supervision, the pollution problem that the galvanizing produced receives attention of lamp pole manufacturers. Meanwhile, the zinc layer on the surface of the galvanized plate is easy to damage in the carrying process and difficult to repair, and particularly, the corrosion problem at a high place is difficult to find when the top of a high lamp pole with the height of more than 15 meters is exposed to the sun and rain. In addition, water is easily accumulated at the connecting part of the lamp pole and the base and at the corner, the water is corroded to influence the attractiveness of the lamp pole, and if the water is not found in time, the material performance is lost, so that safety accidents are caused. Therefore, the steel plate with excellent corrosion resistance is required to replace the Q235 steel plate for the common lamp post, so that the risk of corrosion damage of the lamp post is reduced.
The existing corrosion-resistant steel patents all adopt the combination of corrosion-resistant elements such as Cu, Cr, Ni and the like, but lack the formula of the corrosion-resistant elements special for the street lamp pole.
Disclosure of Invention
In view of the above analysis, embodiments of the present invention are directed to providing a corrosion-resistant hot-rolled steel sheet and a method for manufacturing the same, which solve the problem of poor corrosion resistance of the hot-rolled steel sheet for street light pole.
The invention is realized by the following technical scheme:
the corrosion-resistant hot-rolled steel plate for the street lamp pole comprises the following chemical composition elements in percentage by mass: c: 0.02 to 0.25%, Si: 0.3 to 1.0%, Mn: 0.6-2.0%, P: 0.005-0.15%, S: 0.001 to 0.025%, Cu: 0.02-0.8%, Cr: 0.5 to 1.0%, Ni: 0.1 to 1.5%, Sn: 0-0.02%, Sb: 0-0.02%, Ca: 0.0002 to 0.01%, Re: 0.0005-0.03%, the balance being iron and other unavoidable impurity elements.
The steel sheet further contains at least one of V, Nb, Ti and Mo in an amount of 0.6% or less in total.
Furthermore, the metallographic structure of the steel plate is a mixture of ferrite and pearlite, wherein the proportion of the ferrite is 65-80%.
A preparation method of a corrosion-resistant hot-rolled steel plate for a street lamp post comprises the following steps:
step 1: putting the billet into a heating furnace for heating;
step 2: carrying out rough rolling and finish rolling on the heated steel billet;
and step 3: and (3) obtaining a steel plate after finish rolling, rapidly cooling the steel plate to 600-700 ℃, preserving heat for a certain time, and then air-cooling to room temperature to obtain the steel plate suitable for the street lamp pole.
Further, in the step 1, the billet is placed in a heating furnace for heating, the temperature of a heating uniform temperature zone is 1180-1250 ℃, the heat preservation time of the uniform temperature zone is 2-3 hours, and rolling is carried out after heat preservation.
Further, in the step 2, the initial rolling temperature is 1130-1200 ℃, and the final rolling temperature is 950-1000 ℃.
Further, the steel plate after the finish rolling in the step 3 is quickly cooled to 600-700 ℃, then is subjected to heat preservation for 2-3 hours, and then is subjected to air cooling to room temperature.
Further, the cooling method after finish rolling is laminar cooling.
Further, the cooling speed of laminar cooling is 20-50 ℃/s.
Further, the thickness of the steel plate after hot rolling preparation is 2-4 mm.
Compared with the prior art, the invention can realize at least one of the following beneficial effects:
1. ca and Re elements can be added into the corrosion-resistant steel plate for the street lamp post, Re plays roles of purifying molten steel and improving the form of inclusions in the steel, Ca wires are fed into the steel to facilitate coating of oxides, and Re and Ca have a comprehensive effect of spheroidizing the inclusions, so that the surface energy of the inclusions is reduced, and the corrosion interface expansion is reduced, thereby improving the corrosion resistance of the steel.
2. The corrosion-resistant hot-rolled steel plate for the street lamp post provided by the invention is prepared by adding and adjusting alloy elements such as Cu, Cr, Ni, Sn, Sb and the like. Tests show that the metallographic structure of the steel plate is a ferrite and pearlite structure, the ferrite proportion is 65-80%, and the steel plate has excellent plasticity and toughness; the corrosive solution is NaHSO3When the corrosion rate is higher than that of the Q235 steel, the relative corrosion rate of the steel plate and the Q235 steel is lower than 55%; NaCl with the concentration of 2% is selected as the corrosion solution, and the relative corrosion rate of the steel plate and the Q235 steel is lower than 70%.
3. According to the invention, by adding trace alloy elements such as Ca, Re, V, Nb, Mo and Ti, crystal grains are refined in steel, and crystal phase boundaries in the steel are purified, so that the surface performance of the steel plate is uniform, and after sand blasting is carried out on the surface of the steel plate, the adhesive force of the coating is superior to that of the traditional Q235 steel plate, thereby improving the corrosion resistance and surface coating performance of the steel plate, and improving the corrosion resistance of the steel.
4. According to the invention, corrosion-resistant alloy elements of Cu, Cr, Ni and Sb are added into the steel, so that the corrosion resistance of the steel plate is improved, compared with a common steel plate, a rust layer formed on the surface of the corrosion-resistant steel plate is uniform and compact, and a channel for a corrosion medium to enter a steel matrix is blocked; the common rust layer of the steel is loose, a large number of cracks exist, a stable rust layer is difficult to form, a corrosion medium continuously permeates into the rust layer, the rust layer continuously penetrates into a matrix in the rust process, the volume of the rust layer continuously expands in the rust process, the coating on the surface of the steel plate falls off, and the protective effect of the coating fails.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a structural diagram of a ferrite and pearlite structure in a metallographic structure of a corrosion-resistant steel sheet.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
On one hand, in order to solve the corrosion problem of the street lamp post, the invention provides a corrosion-resistant hot-rolled steel plate which comprises the following chemical components: c: 0.02 to 0.25%, Si: 0.3 to 1.0%, Mn: 0.6-2.0%, P: 0.005-0.15%, S: 0.001 to 0.025%, Cu: 0.02-0.8%, Cr: 0.5 to 1.0%, Ni: 0.1 to 1.5%, Sn: 0.0-0.02%, Sb: 0.0-0.02%, Re: 0.0005 to 0.03%, Ca: 0.0002 to 0.01 percent.
In order to further improve the strength and corrosion resistance of the steel sheet, the steel sheet further contains one or more microalloying elements of at least one of V, Nb, Ti and Mo in an amount of 0.6% or less in total. Wherein, V: 0.01 to 0.16%, Nb: 0.01 to 0.04%, Ti: 0.001-0.02%, Mo: 0.01 to 0.5 percent. V, Nb, Ti and Mo can further refine the structure, improve the strength and have high requirement on the wind resistance level.
Particularly, Ca, Re and Re added in the manufacture of the corrosion-resistant steel plate provided by the invention play roles in purifying molten steel and improving the form of inclusions in the steel, Ca wires are fed into the steel to facilitate the coating of oxides, and the comprehensive effect of Re and Ca is used for spheroidizing the inclusions, reducing the surface energy of the inclusions and reducing the expansion of a corrosion interface, thereby improving the corrosion resistance of the steel.
The effects of the elements in the chemical components of the steel plate are explained as follows:
the C element is a strengthening element of steel, the carbon content is low, the strength of the material is insufficient, the C content is too high, and the welding difficulty is high. According to the strength grade and the wind resistance grade of the lamp pole, the maximum carbon content is not more than 0.25%, and the carbon content is selected to be 0.06% -0.15% in the conventional strength, so that the strength of the steel plate is ensured, and the steel plate has good toughness.
The Si element is dissolved in ferrite to increase the yield strength of steel to less than 0.15%, which increases the cost of the steel-making process. Higher than 0.55 percent, the slab is easy to generate regenerated iron sheet which is difficult to remove, and the surface quality of the finished steel plate is affected. Therefore, the range of 0.15% to 0.55% was determined.
The main elements in the Mn steel improve the strength of the steel. The content range is determined to be 0.60-2.00% according to the strength grade, and the optimal range is 0.8-1.6%.
P tends to cause segregation, and is disadvantageous in weldability and moldability. In order to ensure the weldability and the formability, the content is controlled to be lower than 0.020%.
S element is easy to form sulfide inclusion, the continuity of the steel plate is damaged, the corrosion resistance of the steel is reduced, but the steel-making cost is increased by too low, the steel-making cost is controlled to be lower than 0.020%, and the content of S is controlled to be less than 0.005% in the environment with severe corrosion resistance environment.
The corrosion resistance of the steel can be improved by adding a small amount of Cu. Less than 0.02% Cu is not effective, and more than 0.8% Cu easily causes high temperature Cu embrittlement. The Cu and the Ni are reasonably matched, so that the corrosion resistance of the steel can be improved, and the Cu brittleness phenomenon can be effectively avoided.
Ni improves hardenability elements of the steel, improves the strength of the steel without reducing the toughness of the steel, and avoids high-temperature Cu brittleness of a casting blank by adding Cu and the composite additive. The Ni and the Cr are added in a composite way, and the content range with better corrosion resistance is as follows: 0.1 to 1.5 percent.
Cr is an element for improving the hardenability of steel, a strong carbide forming element, the corrosion resistance of the steel is improved by matching with Cu, the necessary amount is 0.30%, and the upper limit of the Cr content can be adjusted to 1.0% according to the difference of corrosion-resistant environments, so that the reasonable Cr content range is 0.3-1.0%.
Sb is an effective element for improving corrosion resistance, and a compact oxide film which is higher than a matrix by times and is rich in Sb, Zr, Cu, Cr and other elements is formed on the surface of the Sb, so that the Sb, the Zr, the Cu, the Cr and the like have high sulfuric acid dew point corrosion resistance; less than 0.04% is not effective, and more than 0.30% is preferable because it tends to deteriorate in heat processing, and therefore the content thereof is 0.04% to 0.30%. The Sb-containing oxide film has uniform and compact surface, and the film enrichment on the surface of the corrosion-resistant steel can change the compactness and electrochemical performance of the film, thereby effectively slowing down the development of corrosion in atmospheric environment and corrosive environment and improving the corrosion resistance of the steel.
Ca trace calcium element can be used as a deoxidizing and desulfurizing cleaning agent in steel, improves the form of nonmetallic inclusion, and is widely used for Ca treatment of clean steel. The effects of Ca segregation in grain boundaries and segregation of elements such as C, Cr, S and Si in grain boundaries, as well as the effects of Ca alloying such as the effects on hardenability and impact toughness of steel, have also attracted attention.
Re has the functions of degassing, desulfurizing and eliminating other harmful impurity, and can improve the form and distribution of inclusion and improve the cast structure of steel so as to raise the quality of steel. Re addition of 0.0005-0.03% can raise the oxidation, high temperature strength and creep strength of steel and raise the corrosion resistance of steel plate greatly.
On the other hand, the invention provides a preparation method of a corrosion-resistant hot-rolled steel plate for a street lamp post, which comprises the following steps:
step 1: putting the billet into a heating furnace for heating;
and (3) heating the steel ingot or the rough steel blank in a heating furnace, wherein the temperature of a temperature equalizing section in the heating process is 1180-1250 ℃. And adjusting the heat preservation time according to the content of the alloy, wherein the heat preservation time of the temperature equalization section is 2-3 h, so that the alloy elements are completely dissolved in the solution and then rolled.
Step 2: carrying out rough rolling and finish rolling on the heated steel billet;
the initial rolling temperature of the billet is 1130-1200 ℃, and the final rolling temperature is 950-1000 ℃; rolling to obtain the steel plate.
And step 3: air cooling the steel plate after finish rolling to obtain a steel plate suitable for a street lamp post;
and cooling the steel plate obtained after the finish rolling to 600-700 ℃, preserving the heat for 2-3 h, and then air cooling to room temperature. The cooling mode after finish rolling is laminar cooling, and the cooling speed is 20-50 ℃/s.
The metallographic structure of the corrosion-resistant hot-rolled steel plate suitable for the street lamp post obtained in the application is a mixture of ferrite and pearlite, as shown in figure 1. The proportion of ferrite is 65-80%, so that the excellent plasticity and toughness of the steel plate can be ensured, and the excellent welding performance of the steel plate can be ensured. The hot-rolled steel plate has the elongation percentage of 25-35% through detection.
Example 1
The thickness of the hot rolled steel plate provided by the invention is 2.75mm, and the steel plate comprises the following components in percentage by weight: c: 0.15%, Si: 0.20%, Mn: 1.6%, P: 0.01%, S: 0.003%, Cu: 0.5%, Cr: 0.5%, Ni: 0.11%, Sn: 0.001%, Sb: 0.02%, Ti: 0.02%, Re: 0.0002%, Ca: 0.0002%, the balance being iron and unavoidable impurities.
The preparation method of the corrosion-resistant hot-rolled steel plate for the street lamp post comprises the following steps:
step 1: putting the billet into a heating furnace for heating;
and (3) heating the steel ingot or the rough steel blank in a heating furnace at 1180 ℃ for 1.3h, and then rolling.
Step 2: carrying out rough rolling and finish rolling on the heated steel billet;
the initial rolling temperature is 1135 ℃, and the final rolling temperature range is 950 ℃;
and step 3: air cooling the steel plate obtained after the finish rolling, and then coiling to obtain a steel plate suitable for a street lamp post;
and cooling the steel plate after finish rolling to 650 ℃, and then preserving heat for 2 hours. The cooling mode after finish rolling is laminar cooling, and the cooling speed is 30 ℃/s. The thickness of the rolled steel plate is 2.75 mm.
Example 2
The thickness of the hot rolled steel plate provided by the invention is 4mm, and the steel plate comprises the following components in percentage by weight: c: 0.08%, Si: 0.30%, Mn: 0.6%, P: 0.03%, S: 0.025%, Cu: 0.6%, Cr: 1.0%, Ni: 0.3%, Sn: 0.01%, Sb: 0.015%, Ti: 0.001%, Re: 0.03%, Ca: 0.008% and the balance iron and inevitable impurities.
The preparation method of the corrosion-resistant hot-rolled steel plate for the street lamp post comprises the following steps:
step 1: putting the billet into a heating furnace for heating;
and (3) heating the steel ingot or the rough steel blank in a heating furnace at 1186 ℃ for 1.5h, and then rolling the heated steel ingot or the rough steel blank.
Step 2: carrying out rough rolling and finish rolling on the heated steel billet;
the initial rolling temperature is 1140 ℃, and the final rolling temperature range is 980 ℃; the thickness of the rolled steel plate is 4 mm.
And step 3: the steel plate after finish rolling is cooled in air and then coiled to obtain a steel plate suitable for a street lamp post;
and cooling the finish rolled steel billet to 680 ℃, preserving heat for 3h, then air cooling to 150 ℃, and coiling the steel plate. The cooling mode after finish rolling is laminar cooling, and the cooling speed is 25 ℃/s.
Example 3
The thickness of the hot rolled steel plate provided by the invention is 3.75mm, and the steel plate comprises the following components in percentage by weight: c: 0.25%, Si: 0.20%, Mn: 0.6%, P: 0.03%, S: 0.001 to 0.025%, Cu: 0.48%, Cr: 0.6%, Ni: 0.3%, Sn: 0.0-0.02%, Sb: 0.0-0.02%, Mo: 0.01%, Ti: 0.001%, Re: 0.02%, Ca: 0.007% and the balance of iron and inevitable impurities.
The preparation method of the corrosion-resistant hot-rolled steel plate for the street lamp post comprises the following steps:
step 1: putting the billet into a heating furnace for heating;
and (3) heating the steel ingot or the rough steel blank in a heating furnace at 1200 ℃ for 1.8h, and then rolling.
Step 2: carrying out rough rolling and finish rolling on the heated steel billet;
the initial rolling temperature is 1160 ℃, and the final rolling temperature range is 1000 ℃; the thickness of the rolled steel plate is 3.75 mm.
And step 3: air cooling the steel plate after finish rolling to obtain a steel plate suitable for a street lamp post;
and cooling the steel plate after finish rolling to 690 ℃, and then preserving heat for 2.5 h. The cooling mode after finish rolling is laminar cooling, and the cooling speed is 28 ℃/s.
Example 4
The thickness of the hot rolled steel plate provided by the invention is 2.75mm, and the steel plate comprises the following components in percentage by weight: c: 0.12%, Si: 0.20%, Mn: 1.0%, P: 0.03%, S: 0.010%, Cu: 0.50%, Cr: 0.6, Ni: 0.2%, Sn: 0.005%, Sb: 0.008%, Mo: 0.3%, Re: 0.022%, Ca: 0.006%, the balance being iron and unavoidable impurities
The preparation method of the corrosion-resistant hot-rolled steel plate for the street lamp post comprises the following steps:
step 1: putting the billet into a heating furnace for heating;
and (3) heating the steel ingot or the rough steel blank in a heating furnace at 1186 ℃ for 2.3 hours, and then rolling the heated steel ingot or the rough steel blank.
Step 2: carrying out rough rolling and finish rolling on the heated steel billet;
the initial rolling temperature is 1140 ℃, and the final rolling temperature range is 950 ℃; the thickness of the rolled steel plate is 2.75 mm.
And step 3: air cooling the steel plate after finish rolling to obtain a steel plate suitable for a street lamp post;
and cooling the finish rolled steel billet to 650 ℃, preserving heat for 3 hours, and then air cooling. The cooling mode after finish rolling is laminar cooling, and the cooling speed is 35 ℃/s.
Example 5
The hot rolled steel plate for the lamp post provided by the invention is hot rolled with the thickness of 2mm, and comprises the following components in percentage by weight: c: 0.06%, Si: 0.45%, Mn: 1.2%, P: 0.02%, S: 0.001%, Cu: 0.03%, Cr: 1.0%, Ni: 1.5%, Mo: 0.5%, Sn: 0.018%, Sb of 0.016%, Re: 0.027%, Ca: 0.007% and the balance of iron and inevitable impurities.
The preparation method of the corrosion-resistant hot-rolled steel plate for the street lamp post comprises the following steps:
step 1: putting the billet into a heating furnace for heating;
and (3) heating the steel ingot or the rough steel blank in a heating furnace at 1250 ℃ for 3h, and then rolling.
Step 2: carrying out rough rolling and finish rolling on the heated steel billet;
the initial rolling temperature is 1180 ℃, and the final rolling temperature range is 980 ℃; the thickness of the rolled steel plate is 2 mm.
And step 3: air cooling the steel plate after finish rolling to obtain a steel plate suitable for a street lamp post;
and cooling the finish rolled steel billet to 700 ℃, preserving heat for 3 hours, and then carrying out air cooling finish rolling in a laminar cooling mode at a cooling speed of 50 ℃/s.
Example 6
The hot rolled steel plate for the lamp post provided by the invention is hot rolled with the thickness of 2.5mm, and comprises the following components in percentage by weight: c: 0.015%, Si: 0.25%, Mn: 0.6%, P: 0.02%, S: 0.001%, Cu: 0.03%, Cr: 0.8%, Ni: 1.2%, Sn: 0.017%, Sb: 0.015%, Mo: 0.038%, Ca: 0.0022%, Re: 0.03 percent. The balance being iron and unavoidable impurities.
The preparation method of the corrosion-resistant hot-rolled steel plate for the street lamp post comprises the following steps:
step 1: putting the billet into a heating furnace for heating;
and (3) heating the steel ingot or the rough steel blank in a heating furnace at 1250 ℃ for 3h, and then rolling.
Step 2: carrying out rough rolling and finish rolling on the heated steel billet;
the initial rolling temperature is 1150 ℃, and the final rolling temperature range is 960 ℃; the thickness of the rolled steel plate is 2.5 mm.
And step 3: air cooling the steel plate after finish rolling to obtain a steel plate suitable for a street lamp post;
and cooling the finish rolled steel billet to 620 ℃, preserving the heat for 2.5 hours, and then air cooling. The cooling mode after finish rolling is laminar cooling, and the cooling speed is 20 ℃/s.
Example 7
The hot rolled steel plate for the lamp post provided by the invention is hot rolled with the thickness of 4mm, and comprises the following components in percentage by weight: c: 0.21%, Si: 0.35%, Mn: 1.43%, P: 0.02%, S: 0.003%, Cu: 0.5%, Cr: 0.6%, Sn: 0.01%, Sb: 0.01%, Nb: 0.03%, V: 0.12%, Re: 0.2%, Ca: 0.0018%, the balance being iron and unavoidable impurities.
The preparation method of the corrosion-resistant hot-rolled steel plate for the street lamp post comprises the following steps:
step 1: putting the billet into a heating furnace for heating;
and (3) heating the steel ingot or the rough steel blank in a heating furnace at 1200 ℃ for 2h, and then rolling.
Step 2: carrying out rough rolling and finish rolling on the heated steel billet;
the initial rolling temperature is 1160 ℃, and the final rolling temperature range is 980 ℃; the thickness of the rolled steel plate is 4 mm.
And step 3: air cooling the steel plate after finish rolling to obtain a steel plate suitable for a street lamp post;
and cooling the finish rolled steel plate to 610 ℃, preserving heat for 2 hours, and then air cooling. The cooling mode after finish rolling is laminar cooling, and the cooling speed is 40 ℃/s.
Compared with the prior art, the technical scheme for detecting the corrosion resistance of the steel plate is that a TB/2375 week immersion accelerated corrosion test method is adopted to process the steel plate into the steel plate with the thickness of 1.5mm by 150 x 70mm, and NaHSO is selected as a corrosion solution3And circulating for 72 hours. The relative corrosion rates of the steel sheets of examples 1-5 and the Q235 steel were less than 55%, as shown in Table 1; by adopting a YB/T4367 corrosion resistance detection method, NaCl with a concentration of 2% in a corrosion solution circulates for 72 hours, and the relative corrosion rate of the steel plate and the Q235 steel in examples 1-5 is lower than 70%, as shown in Table 1.
Table 1: test results of corrosion resistance of steel plate
The results of the steel plate surface sandblasting adhesion test after the steel plate was sandblasted are shown in table 2. As can be seen from Table 2, the steel sheet surface coating performance is excellent when the adhesion between the paint film and the steel sheet is tested by a pull-off method. The steel plate has good sand blasting adhesion, and can block the passage of corrosive medium entering the steel matrix, thereby improving the corrosion resistance of the steel plate.
Table 2: strength test results of Steel sheet
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and the heat-retaining time after laminar cooling can be appropriately extended in accordance with the user's request in the case where the thickness of the steel sheet is increased. Any changes or substitutions that may be easily made by those skilled in the art within the technical scope of the present disclosure are intended to be included within the scope of the present disclosure.
Claims (9)
1. The corrosion-resistant hot-rolled steel plate for the street lamp post is characterized in that the steel plate comprises the following chemical composition elements in percentage by mass: c: 0.02 to 0.25%, Si: 0.45-1.0%, Mn: 0.6-2.0%, P: 0.005-0.15%, S: 0.001 to 0.025%, Cu: 0.5-0.8%, Cr: 0.5 to 1.0%, Ni: 1.2-1.5%, Sn: 0.001-0.02%, Sb: 0.008-0.016%, Ca: 0.0002 to 0.01%, Re: 0.0005-0.03%, the balance being iron and other unavoidable impurity elements;
the metallographic structure of the steel plate is a mixture of ferrite and pearlite, wherein the proportion of the ferrite is 65-80%.
2. The corrosion-resistant hot-rolled steel sheet for street lamp post according to claim 1, wherein the steel sheet further contains at least one of V, Nb, Ti and Mo in an amount of 0.6% or less in total.
3. A preparation method of a corrosion-resistant hot-rolled steel plate for a street lamp post is characterized by comprising the following steps of:
step 1: putting the billet into a heating furnace for heating;
step 2: carrying out rough rolling and finish rolling on the heated steel billet;
and step 3: and (3) obtaining a steel plate after finish rolling, rapidly cooling the steel plate to 600-700 ℃, preserving heat for a certain time, and then air-cooling to room temperature to obtain the steel plate suitable for the street lamp pole.
4. The method for preparing the corrosion-resistant hot-rolled steel plate for the street lamp post according to claim 3, wherein in the step 1, the steel billet is placed in a heating furnace for heating, the temperature of a heating uniform temperature zone is 1180-1250 ℃, the heat preservation time of the uniform temperature zone is 2-3 h, and the steel billet is rolled after heat preservation.
5. The method for preparing the corrosion-resistant hot-rolled steel plate for the street lamp post according to claim 3, wherein in the step 2, the start rolling temperature is 1130-1200 ℃, and the finish rolling temperature is 950-1000 ℃.
6. The preparation method of the corrosion-resistant hot-rolled steel plate for the street lamp post according to claim 3, wherein the steel plate obtained after the finish rolling in the step 3 is rapidly cooled to 600-700 ℃, then is kept for 2-3 hours, and then is air-cooled to room temperature.
7. The method for manufacturing the corrosion-resistant hot-rolled steel sheet for the street lamp post according to claim 6, wherein the cooling manner after finish rolling is laminar cooling.
8. The method for preparing the corrosion-resistant hot-rolled steel plate for the street lamp post according to claim 7, wherein the cooling speed of laminar cooling is 20-50 ℃/s.
9. The method for preparing the corrosion-resistant hot-rolled steel plate for the street lamp post according to any one of claims 4 to 8, wherein the thickness of the steel plate prepared after hot rolling is 2 to 4 mm.
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