CN110863147B - Q690 corrosion-resistant steel for mine environment service and preparation method thereof - Google Patents
Q690 corrosion-resistant steel for mine environment service and preparation method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- 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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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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Abstract
The invention discloses Q690 corrosion-resistant steel for mine environment service and a preparation method thereof, wherein the Q690 corrosion-resistant steel comprises the following components in percentage by weight: 0.04-0.10% of C, 0.5-1.0% of Mn, 0.2-0.35% of Si, 1.3-1.7% of Cr, less than or equal to 0.005% of S, less than or equal to 0.008% of P, less than or equal to 0.035% of Al, 0.02-0.03% of Nb, 0.015-0.025% of Zr and the balance of Fe, wherein the preparation method comprises the following steps: 1) forging after smelting by using a vacuum smelting furnace; 2) heating and insulating the billet at 1180-1230 ℃, adopting a high-temperature slow-speed high-pressure technology, finishing rolling at 800-880 ℃, and then carrying out on-line quenching; 3) heating the steel plate to 910-930 ℃ for austenitizing, and then cooling with water; 4) tempering at 590-610 deg.c and subsequent air cooling. The yield strength of the corrosion-resistant steel is higher than 690MPa, the tensile strength is 780-940MPa, and the corrosion rate under the service of a typical service mine environment is 0.12-0.14 mm/a.
Description
Technical Field
The invention relates to the technical field of metal material processing, in particular to novel Q690 corrosion-resistant steel in service in a mine environment and a preparation method thereof.
Background
The high-strength structural steel is a resource-saving product with high technical content and high added value, and the low-alloy high-strength steel has strong adaptability and is mainly used for welding components, so that the steel is required to have high strength and plastic toughness and good weldability and process processability. As the low-alloy high-strength structural steel, Q690 has the characteristics of high strength, good toughness, good processability and welding performance and the like, belongs to the most widely applied steel grade in the high-strength steel, and is mainly used in the fields of engineering machinery, coal mine machinery, shipbuilding, steel structures and the like.
The Chinese patent with the publication number of CN109402508A discloses a low-carbon microalloyed Q690-grade high-strength weathering steel and a production method thereof, and particularly discloses a method for producing the Q690-grade high-strength weathering steel by utilizing a V-N-Cr microalloying technology, wherein VN and V (C, N) nanometer-sized precipitates can promote nucleation of ferrite in a crystal and improve the toughness of a plate core in a billet rolling process, and the Q690-grade high-strength weathering steel produced by the refining effect of crystal grains and the precipitation strengthening principle has atmospheric corrosion resistance, good toughness comprehensive performance and good low-temperature impact performance, but cannot adapt to a special mine service environment, can face a corrosion problem in the mine environment service, and long-time corrosion can lead equipment to corrosion failure and cause serious economic and safety consequences.
Chinese patent publication No. CN104233077A discloses a method for producing high-strength corrosion-resistant steel, and more particularly discloses a method for producing corrosion-resistant steel sheet with high strength, in which the content of Cr added in the component design is 13% to 18%, the component design of the invention is not economical, the cost is very high, and the patent does not give detailed description on which grade the finally achievable performance can be reached, and cannot be reasonably speculated according to the prior art and the content disclosed by the patent.
According to the development requirement of using high-strength steel under the mine environment service, the performance requirement of a high-performance Q690 high-strength structural steel plate is higher and higher, the high strength and toughness performance is required, good welding performance and corrosion resistance are also required, and in addition, the production is easy and the cost is low. According to the research literature, no research is carried out on Q690 corrosion-resistant steel under the service of the mine environment and a manufacturing method thereof at present.
Disclosure of Invention
In view of the defects in the prior art, the inventor of the invention continuously reforms and innovates through long-term exploration and trial and multiple experiments and efforts, and provides Q690 corrosion-resistant steel which is designed to contain Zr and has good mechanical property, welding property and corrosion resistance and is in service in a mine environment, and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a Q690 corrosion-resistant steel for service in a mine environment, which comprises the following chemical components in percentage by mass: 0.04-0.10% of C, 0.5-1.0% of Mn, 0.2-0.35% of Si, 1.3-1.7% of Cr, less than or equal to 0.005% of S, less than or equal to 0.008% of P, less than or equal to 0.035% of Al, 0.02-0.03% of Nb, 0.015-0.025% of Zr, and the balance of Fe and other inevitable impurities.
In the invention, the yield strength of the corrosion-resistant steel is more than or equal to 690MPa, the tensile strength is 780-940MPa, and the corrosion rate in service under a typical service mine environment is 0.12-0.14 mm/a.
A preparation method of Q690 corrosion-resistant steel for mine environment service comprises the following steps:
1) selecting the alloy according to the following main elements in percentage by mass:
0.04-0.10% of C, 0.5-1.0% of Mn, 0.2-0.35% of Si, 1.3-1.7% of Cr, less than or equal to 0.005% of S, less than or equal to 0.008% of P, less than or equal to 0.035% of Al, 0.02-0.03% of Nb, 0.015-0.025% of Zr, and the balance of Fe and other inevitable impurities;
2) smelting and forging, namely smelting by using a vacuum smelting induction furnace according to design components, and forging into a square billet of 80 multiplied by 100mm after smelting, so that the internal defects of metal are reduced, and the performance is improved;
3) rolling, namely firstly heating the steel billet at 1180-1230 ℃, preserving heat for 150min, then carrying out rough rolling and finish rolling on the steel billet by adopting a high-temperature slow-speed high-pressure technology, and adoptingTwo-stage (rough rolling in stage I and finish rolling in stage II) rolling at a strain rate of 0.2-2.0s-1The final rolling temperature is controlled at 800-;
4) quenching and tempering heat treatment, namely heating the steel to 910-930 ℃ immediately after rolling, preserving heat for 60-70min to ensure that the steel is completely austenitized, then cooling the steel to room temperature by water, then heating the obtained steel to 590-610 ℃, preserving heat for 80-90min, and then cooling the steel to room temperature by air.
Preferably, the technology under high temperature, slow speed and high pressure in the step 3) is as follows: rolling at 1180-1230 deg.c to total rolling rate of 80-90% and strain rate of 0.2-2.0s-1The final rolling temperature is controlled at 800-880 ℃.
Preferably, in the step 2), the smelting end point temperature is controlled to be 1640-1680 ℃; the final forging temperature is controlled at 800-850 ℃.
Preferably, the step 4) is carried out immediately after the step 3) by adopting on-line quenching, wherein the rough rolling reduction is 60-70%, and the finish rolling reduction is 50-60%.
The corrosion-resistant steel obtained by the invention is a steel plate with yield strength higher than 690MPa and tensile strength of 780-940MPa, the corrosion rate under the service of a typical service mine environment is 0.12-0.14mm/a, and the corrosion resistance of the corrosion-resistant steel is improved by more than 1.5 times compared with that of the traditional Q690D steel.
The steel with excellent mechanical property and corrosion resistance in service in the mine environment is manufactured, the steel loss and equipment failure caused by corrosion can be effectively reduced, and the service life and reliability of equipment for the mine are greatly prolonged and improved. The preparation method based on the existing production process has good cost advantage and can be used for mass production.
The objectives and other advantages of the invention will be apparent from the written description, claims, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic representation of the metallographic structure of a steel sheet according to example 1 of the present invention;
FIG. 2 is a macro (FIG. 2a) and micro-topography (FIG. 2b) of a 16mm steel plate after corrosion in example 1 of the present invention;
FIG. 3 is a macro (FIG. 3a) and micro-topography (FIG. 3b) of a conventional Q690D steel sheet after corrosion in example 1 of the present invention;
FIG. 4 is a schematic representation of the metallographic structure of a steel sheet according to example 2 of the invention;
FIG. 5 is a macro (FIG. 5a) and micro topography (FIG. 5b) of a 16mm steel plate after corrosion in example 2 of the present invention;
FIG. 6 is a macro (FIG. 6a) and micro-topography (FIG. 6b) of a conventional Q690D steel sheet after corrosion in example 2 of the present invention.
Detailed Description
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. Unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features. The description is only for the purpose of facilitating understanding of the present invention and should not be construed as specifically limiting the present invention.
The invention is described in further detail below with reference to the figures and the detailed description.
Example 1
The embodiment provides novel Q690 corrosion-resistant steel in service in a mine environment, a 350mm double-roller reversible rolling mill is adopted, the rolling force is 1200KN, the novel Q690 corrosion-resistant steel with the thickness specification of 16mm is produced, the specific element composition is shown in Table 1, and the balance is Fe and inevitable impurities.
TABLE 116 mm DEPTH Standard New Q690 Corrosion resistant Steel chemical composition actual weight percent
Smelting by using a vacuum smelting induction furnace according to design components, forging into a square billet with the size of 80 multiplied by 100mm after smelting, reducing internal defects of metal, and improving performance, wherein the smelting end point temperature is controlled to be 1640-1680 ℃; the final forging temperature is controlled at 800-850 ℃. Because the experimental steel has high strength, the 16mm thin steel plate is subjected to controlled rolling by adopting a technical mode of high temperature, slow speed and high pressure, the controlled rolling and controlled cooling process is shown in the table 2, the integral compression ratio is more than 6 times, a blank with the thickness of 100mm is selected, the heating temperature is controlled at 1200 ℃, and the temperature is kept for 120 min.
TABLE 2 controlled rolling and controlled cooling process
In the rolling process, in order to avoid the occurrence of core segregation and influence on strength and toughness, a two-stage rolling method is adopted, and the rolling deformation rate of one stage is more than or equal to 60 percent, and the total deformation rate of the two stages is more than or equal to 50 percent. In order to improve the ductility and toughness, the tensile strength needs to be increased, so the finishing temperature in the stage II is controlled at 800-880 ℃. The performance parameters of the corrosion-resistant steel are shown in Table 3.
TABLE 3 Corrosion resistant Steel Performance parameters
The conventional Q690 steel has no specific requirement on corrosion resistance, in the embodiment, Q690D steel is used as a comparison, the corrosion environment is a simulated mine service environment, the corrosion rate is 0.212mm/a, and compared with Q690D steel, the 16mm novel Q690 corrosion-resistant steel in the embodiment has the corrosion resistance improved by 1.52 times. The formed products of the corrosion-resistant steel comprise a hydraulic support for a coal mine and an engineering machine for a mine.
Through experimental analysis of the metallographic structure of the novel Q690 corrosion-resistant steel obtained by the method of the invention, as shown in FIG. 1, the structure of the novel Q690 corrosion-resistant steel is martensite.
By analyzing the macro and micro shapes of the corrosion shape of the novel Q690 corrosion-resistant steel obtained by the method, as shown in FIG. 2, the macro and micro shapes after corrosion are shown, compared with the conventional Q690D steel, the product of the steel after corrosion is more and compact, a corrosion product film can be formed on the surface of a substrate, the further development of corrosion is hindered, the amount of the corrosion product is less, and the corrosion resistance of the steel is stronger.
By analyzing the macro and micro shapes of the corrosion shape of the current conventional Q690D steel, the macro and micro shapes after corrosion are shown in FIG. 3.
Example 2
The embodiment provides novel Q690 corrosion-resistant steel in service in a mine environment, which is also taken as an example of novel Q690 corrosion-resistant steel with the thickness specification of 16mm, and the difference is that the mass percentages of various elements are different, the specific element composition is shown in a table 4, and the balance is Fe and inevitable impurities.
TABLE 416 mm DEPTH Standard New Q690 Corrosion resistant Steel chemical composition actual weight percent
Smelting by using a vacuum smelting induction furnace according to design components, forging into a square billet with the size of 80 multiplied by 100mm after smelting, reducing internal defects of metal, and improving performance, wherein the smelting end point temperature is controlled to be 1640-1680 ℃; the final forging temperature is controlled at 800-850 ℃. Because the strength of the experimental steel is high, the 16mm thin steel plate is subjected to controlled rolling by adopting a high-temperature slow-speed high-pressure mode, the controlled rolling and controlled cooling process is shown in table 5, the integral compression ratio is more than 6 times, a blank with the thickness of 100mm is selected, the heating temperature is controlled to be about 1200 ℃, and the temperature is kept for 120 min.
TABLE 5 controlled Rolling and controlled Cooling Process
In the rolling process, in order to avoid the occurrence of core segregation and influence on strength and toughness, a two-stage rolling method is adopted, and the rolling deformation rate of one stage is more than or equal to 60 percent, and the deformation rate of the two stages is more than or equal to 50 percent. In order to improve the ductility and toughness, the tensile strength needs to be increased, so the finishing temperature in the stage II is controlled at 800-880 ℃. The resulting corrosion resistant steel performance parameters are shown in Table 6.
TABLE 6 Corrosion resistant Steel Performance parameters
Conventional Q690 steel does not have clear requirement on corrosion resistance, in this embodiment Q690D steel is used as a comparison, the corrosion environment is a simulated mine service environment, the corrosion rate is 0.2082mm/a, and the corrosion resistance of the novel Q690 corrosion-resistant steel in this embodiment is improved by 1.62 times compared with Q690D steel. The formed products of the corrosion-resistant steel comprise a hydraulic support for a coal mine and an engineering machine for a mine.
Through experimental analysis of the metallographic structure of the novel Q690 corrosion-resistant steel obtained by the method of the present invention, as shown in FIG. 4, the structure thereof is known to be martensite.
By analyzing the macro and micro shapes of the corrosion shape of the novel Q690 corrosion-resistant steel obtained by the method, as shown in FIG. 5, the macro and micro shapes after corrosion are shown, compared with the traditional Q690D steel, the product of the steel after corrosion is more and compact, a corrosion product film can be formed on the surface of a substrate, the further development of corrosion is hindered, the amount of the corrosion product is less, and the corrosion resistance of the steel is stronger.
By analyzing the macro and micro shapes of the corrosion shape of the current conventional Q690D steel, the macro and micro shapes after corrosion are shown in FIG. 6.
In addition to the above embodiments, the present invention may have other embodiments, and any technical solutions formed by equivalent substitutions or equivalent transformations are within the scope of the present invention.
The method can be realized by upper and lower limit values and interval values of intervals of process parameters (such as temperature, time and the like), and embodiments are not listed.
Conventional technical knowledge in the art can be used for the details which are not described in the present invention.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. The Q690 corrosion-resistant steel for the service of a mine environment is characterized by comprising the following chemical components in percentage by mass: 0.04-0.095% of C, 0.5-1.0% of Mn, 0.2-0.35% of Si, 1.3-1.7% of Cr, less than or equal to 0.005% of S, less than or equal to 0.008% of P, less than or equal to 0.035% of Al, 0.02-0.03% of Nb, 0.015-0.025% of Zr, and the balance of Fe and other inevitable impurities;
the preparation method of the corrosion-resistant steel comprises the following steps:
1) selecting the alloy according to the mass percentage of chemical components of the corrosion-resistant steel:
2) smelting and forging:
smelting the alloy in the step 1) by using a vacuum smelting furnace, and forging the smelted alloy into a square billet;
3) rolling:
heating and preserving the temperature of the smelted steel billet at 1180-1230 ℃ for 120-fold heat for 150min, performing rough rolling and finish rolling on the steel billet by adopting a high-temperature slow-speed high-pressure technology, and performing online quenching after rolling; wherein, the technology under high temperature, slow speed and large pressure is as follows: rolling at 1180-1230 deg.c to total rolling rate of 80-90% and strain rate of 0.2-2.0s-1The final rolling temperature is controlled at 800-880 ℃;
4) quenching and tempering heat treatment:
heating the steel obtained in the step 3) to 910-930 ℃, preserving heat for 60-70min for austenitizing, then cooling the steel to room temperature by water, heating the obtained steel to 590-610 ℃, preserving heat for 80-90min, and then cooling the steel to room temperature by air.
2. The Q690 corrosion-resistant steel for mine environment service as claimed in claim 1, wherein the yield strength of the corrosion-resistant steel is not less than 690MPa, the tensile strength is 780-940MPa, and the corrosion rate is 0.12-0.14 mm/a.
3. The Q690 corrosion resistant steel for mine environment service of claim 1, wherein the square billet in step 2) is a 80 x 100mm square billet.
4. The Q690 corrosion-resistant steel for mine environment service according to claim 3, wherein in the step 2), the smelting end point temperature is controlled to be 1640-1680 ℃; the final forging temperature is controlled at 800-850 ℃.
5. The Q690 corrosion-resistant steel for mine environment service according to claim 3, wherein step 4) is performed immediately after step 3) by on-line quenching, and the rough rolling reduction is 60-70% and the finish rolling reduction is 50-60%.
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