CN110846565A - Low-cost large-wall-thickness acid-resistant pipeline steel with stable structure and performance and production method thereof - Google Patents
Low-cost large-wall-thickness acid-resistant pipeline steel with stable structure and performance and production method 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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- 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
- C21D8/0221—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
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing 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
- C21D2211/002—Bainite
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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
Abstract
The invention relates to a low-cost large-wall-thickness acid-resistant pipeline steel with stable structure and performance, which comprises the following chemical components in percentage by weight: 0.03 to 0.08 percent of C, 0.15 to 0.20 percent of Si, 1.05 to 1.15 percent of Mn, less than 0.01 percent of P, less than 0.002 percent of S, 0.025 to 0.035 percent of Nb, 0.015 to 0.025 percent of Ti, less than 0.05 percent of Al, less than 0.006 percent of Ca, and the balance of Fe and inevitable trace impurities. The production method comprises the working procedures of steel making, continuous casting, rolling, coiling and cooling; and (4) a rolling procedure, wherein the outlet temperature of the final pass of rough rolling is 1015-1050 ℃. The invention reduces the segregation of C and the generation of pearlite through the optimal C content; the mixed crystal of the structure is reduced through controlled rolling and controlled cooling, the uniformity of the structure along the thickness direction is realized, and finally, the stability of the structure and the performance of the low-cost large-wall-thickness acid-resistant pipeline steel is realized.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a production method of low-cost large-wall-thickness acid-resistant pipeline steel with stable structure and performance.
Background
With the development of the oil and gas industry, H in natural gas resources2The content of corrosive media such as S and the like is increased. H2H atoms generated from corrosive media such as S easily permeate and accumulate at defective sites such as pearlite and inclusions to form hydrogen gas. When the hydrogen pressure is increased to a certain extent, hydrogen induced cracking of the pipeline steel is caused.
The carbon content in the material is too high, which is unfavorable for the acid resistance, low-temperature toughness, formability, weldability and ductility of the material and influences the comprehensive performance after pipe making. The carbon content in the material is too low, so that the end point oxygen of the converter is high, the removal of inclusions is not facilitated, the acid resistance after pipe making is influenced, and the alloy cost is increased. Therefore, the proper C content has important significance on the structural stability and the performance stability of the pipeline steel. Meanwhile, carbon is easy to generate central segregation in the smelting process, so that the center of the steel plate generates hydrogen atom aggregation defects such as pearlite bands or M/A islands and the like, especially the thick specification, and the HIC and SSCC resistance is greatly reduced.
Chinese patent CN104099522A discloses "copper-nickel-free acid-resistant pipeline steel X52MS and a manufacturing method of a hot rolled coil thereof", wherein the carbon content is preferably 0.035%, the carbon content is too low, the converter decarburization is difficult, the smelting difficulty is increased, and the steel reinforcement is not facilitated. CN102851590A discloses 'acid-resistant low-manganese X70 pipeline steel and a production method thereof', wherein the carbon content is 0.05-0.07%, but expensive Cu, Ni and Mo alloys are added, so that the production cost is high.
In the production process of pipeline steel, the control condition of rolling and cooling processes is an important determinant factor of the microstructure and mechanical property of products, and the production difficulty is also concentrated in the rolling and cooling processes, especially thick-specification pipeline steel. When the thickness specification of the product is larger, the control of the rolling and cooling process is correspondingly improved, and if the control of the rolling and cooling process is improper, the condition of uneven structure and mechanical property of the product can occur. Chinese patent application CN107326261A discloses a 'low yield ratio thin specification high strength acid-resistant pipeline steel hot-rolled coil and a manufacturing method thereof', the carbon content of the coil is 0.04-0.065, the specification is thin, and a certain amount of Cr is added; the cooling speed in the cooling process is slow, the coiling temperature is high, and the alloy and the structure are not favorably strengthened.
With the rapid development of energy pipeline transportation industry in China, higher requirements on low-temperature toughness and additional performance of pipeline steel are provided, and particularly steel plates with large wall thicknesses need to have good low-temperature toughness and acid corrosion resistance. At present, high-cost alloy elements such as Ni and Cu are usually added internationally to improve the acid resistance of the pipeline steel, so that the acid-resistant pipeline steel is extremely consumed in cost and does not meet the market environment with intense competition.
Disclosure of Invention
The invention aims to solve the technical problem of providing low-cost large-wall-thickness acid-resistant pipeline steel and a production method thereof; by selecting the optimal C content of 0.05-0.067%, the segregation of C and the generation of pearlite are reduced, and the addition amount of alloy is reduced; the mixed crystal of the structure is reduced through controlled rolling and controlled cooling, the uniformity of the structure along the thickness direction is realized, and finally, the stability of the structure and the performance of the low-cost large-wall-thickness acid-resistant pipeline steel is realized.
In order to solve the technical problems, the invention adopts the technical scheme that:
the low-cost large-wall-thickness acid-resistant pipeline steel with stable structure and performance comprises the following main components in percentage by weight: 0.03 to 0.08 percent of C, 0.15 to 0.20 percent of Si, 1.05 to 1.15 percent of Mn, less than 0.01 percent of P, less than 0.002 percent of S, 0.025 to 0.035 percent of Nb, 0.015 to 0.025 percent of Ti, less than 0.05 percent of Al, less than 0.006 percent of Ca, and the balance of Fe and inevitable trace impurities.
The low-cost large-wall-thickness acid-resistant pipeline steel with stable structure and performance has the following preferable range of C content: 0.05 to 0.067 percent.
The production method of the low-cost large-wall-thickness acid-resistant pipeline steel with stable structure and performance comprises the working procedures of steel making, continuous casting, rolling, coiling and cooling; the continuous casting process comprises the following steps: the casting blank comprises the following main components in percentage by weight: 0.03 to 0.08 percent of C, preferably 0.05 to 0.067 percent; 0.15 to 0.20 percent of Si, 1.05 to 1.15 percent of Mn, less than 0.01 percent of P, less than 0.002 percent of S, 0.025 to 0.035 percent of Nb, 0.015 to 0.025 percent of Ti, less than 0.05 percent of Al, less than 0.006 percent of Ca, and the balance of Fe and inevitable trace impurities.
The rolling process comprises the following steps: the outlet temperature of the final pass of rough rolling is set to be 1015-1050 ℃, and the inlet temperature of finish rolling is set to be 960-995 ℃; the finishing temperature is set to be between 815 and 835 ℃; the coiling temperature is set to be 470-490 ℃. The final pass reduction rate of the rough rolling stage is 25.5-26.5%, and the accumulated reduction rate of the rough rolling is 73.5-76.7%; the first pass reduction rate of finish rolling is 21.5-23.8%, and the cumulative reduction rate of finish rolling is 68.1-70.8%.
The cooling procedure adopts a non-feedback centralized cooling mode, the number of boiled water groups is calculated before the finish rolling end frame is threaded, the calculated amount of the model is reduced, and the stability of the model is improved; setting the water quantity ratio of the laminar cooling upper and lower cooling headers to be (0.86-0.93): 1, the cooling strength of the upper surface and the lower surface of the steel strip is balanced, the uniformity of the structure and the performance is ensured, and the plate shape problems of C warp, bow back and the like are avoided.
The controlled rolling process comprises the following steps: in order to provide a certain tension to the steel strip to ensure the shape and the alignment degree, the speed of the roller table is slightly higher than that of the steel strip, which results in thatThe steel strip still has certain acceleration; setting the roller way speed to be 0.008-0.012 m/s relative to the steel strip acceleration2The method not only ensures the shape and the centering degree of the steel strip, but also prevents the model from being disordered due to overlarge speed change of the steel strip and excessive added cooling collecting pipes, and ensures the cooling uniformity in the length direction of the steel strip.
According to the production method of the low-cost large-wall-thickness acid-resistant pipeline steel with stable structure and performance, the thickness of the pipeline steel strip is 17.0-19.0 mm, the structure is mainly ferrite and bainite, the volume ratio of the ferrite to the bainite is more than 95%, and the grain size is 11-12 grades.
Theoretical analysis:
carbon is the most economical and effective strengthening element in steel. However, carbon is easy to generate center segregation in the smelting process, so that the center of the steel plate generates hydrogen atom aggregation defects such as pearlite bands or M/A islands, and the like, and the HIC (hydrogen induced cracking) and SSCC (sulfide stress cracking) resistance is greatly reduced. The carbon content is designed to be 0.03% -0.08%, and if the carbon content is lower than 0.03%, on one hand, the converter is difficult to decarbonize, and the smelting difficulty is increased; on the other hand, the strength loss is large, and the strength of the steel plate cannot meet the requirement; if it is higher than 0.08%, the risk of corrosion cracking of the steel sheet in HIC and SSCC environments is multiplied. The high-cost Cu, Ni and Cr elements are removed in the component design, the segregation of the Si, Mn, P and S elements and the influence of the inclusions on the anti-HIC experiment are reduced by strictly controlling the Si, Mn, P and S elements and the state of a continuous casting machine, the influence of the C content on the hydrogen induced cracking is obtained by the comparative analysis of a large amount of test data, and the optimal C content is preferably 0.05-0.067%.
Setting the outlet temperature of the last rough rolling: a Gleeble3500 thermal simulation testing machine is adopted to obtain a high-temperature stress-strain curve of the pipeline steel, the deformation temperature is determined to be 985-1088 ℃, and the rough rolling austenite is ensured to be fully recrystallized, so that the outlet temperature of the final pass of rough rolling is determined to be 1015-1050 ℃, and the final pass reduction amount of the rough rolling stage is increased to 25.5-26.5%.
Setting of finish rolling inlet temperature: a Gleeble3500 thermal simulation testing machine is adopted to research and obtain a high-temperature stress-strain curve of the grade pipeline steel, the temperature of an austenite non-recrystallization region is determined to be 895-925 ℃, partial recrystallization generated in the finish rolling process is considered to be avoided as much as possible, the finish rolling inlet temperature is set to be 960-995 ℃, and the first pass reduction of finish rolling is reduced to 21.5% -23.8%.
Setting the finishing temperature: and obtaining an austenite continuous cooling transformation curve of the pipeline steel of the grade by adopting a Gleeble3500 thermal simulation test, and obtaining that the starting temperature of a double-phase zone is 730-810 ℃, so that the finishing temperature is set to be 815-835 ℃.
Selecting coiling temperature: and (3) obtaining an austenite continuous cooling transformation curve, wherein the temperature of pearlite and widmannstatten tissues is higher than 550 ℃, and the coiling temperature is selected to be 470-490 ℃ in order to avoid overhigh yield ratio caused by excessively refined grains.
Because the steel strip is short, the cooling model has no feedback, and the cooling model can be further optimized by adopting constant-speed rolling. However, in order to provide a certain tension to the steel strip to ensure the plate shape and the centering degree, the speed of the roller table is slightly higher than that of the steel strip, so that the steel strip still has a certain acceleration; setting the roller way speed to be 0.008-0.012 m/s relative to the steel strip acceleration2The method not only ensures the shape and the centering degree of the steel strip, but also prevents the model from being disordered due to overlarge speed change of the steel strip and excessive added cooling collecting pipes, and ensures the cooling uniformity in the length direction of the steel strip.
During the operation of the strip, the cooling strength of the upper surface is greater than that of the lower surface due to gravity. Setting the optimal water quantity ratio of the upper cooling header to the lower cooling header to be (0.86-0.93): 1, the water quantity of the lower collecting pipe is larger than that of the upper collecting pipe, and the cooling uniformity of the upper surface and the lower surface of the steel strip is ensured.
The invention has the beneficial effects that:
under the condition of not adding noble metal, the method reduces the segregation of Si, Mn, P and S elements and the influence of inclusions on hydrogen induced cracks by strictly controlling the Si, Mn, P and S elements and the states of a continuous casting machine, thereby obtaining the influence of C content on hydrogen induced cracking, and obtaining the optimal C content which is preferably 0.05-0.067%; the invention solves the problem that the steel structure of the acid-resistant pipeline with large wall thickness is not uniform along the thickness direction by controlling the rolling process and the cooling process, and has the advantages of lower production cost, higher strength, thicker specification, more stable and excellent performance and strong practicability.
Drawings
FIG. 1 is a graph of the austenite continuous cooling transformation curve of a target steel grade according to the present invention;
FIG. 2 is a microstructure view (500X) of the thickness of pipeline steel 1/2 according to example 1 of the present invention;
FIG. 3 is a microstructure view (500X) of the thickness of pipeline steel 1/2 according to example 2 of the present invention;
FIG. 4 is a microstructure view (500X) of the thickness of pipeline steel 1/2 according to example 3 of the present invention;
FIG. 5 is a microstructure view (500X) of the thickness of pipeline steel 1/2 according to example 4 of the present invention;
FIG. 6 is a microstructure view (500X) of the thickness of pipeline steel 1/2 according to example 5 of the present invention;
FIG. 7 is a microstructure view (500X) of the thickness of pipeline steel 1/2 according to example 6 of the present invention;
FIG. 8 is a microstructure view (500X) of the thickness of pipeline steel 1/2 according to example 7 of the present invention;
FIG. 9 is a microstructure view (500X) of the thickness of pipeline steel 1/2 according to example 8 of the present invention.
Detailed Description
The invention relates to a low-cost large-wall-thickness acid-resistant pipeline steel with stable structure and performance, which comprises the following main components in percentage by weight: 0.03-0.08% of C, preferably 0.05-0.067%; 0.15 to 0.20 percent of Si, 1.05 to 1.15 percent of Mn, less than 0.01 percent of P, less than 0.002 percent of S, 0.025 to 0.035 percent of Nb, 0.015 to 0.025 percent of Ti, less than 0.05 percent of Al, less than 0.006 percent of Ca, and the balance of Fe and inevitable trace impurities.
The production method of the low-cost large-wall-thickness acid-resistant pipeline steel with stable structure and performance comprises the following steps of steelmaking, continuous casting, rolling, coiling and cooling, wherein the processes of the steps are as follows: steel making-continuous casting process: the casting blank comprises the following main components in percentage by weight: 0.03-0.08% of C, preferably 0.05-0.067%; 0.15 to 0.20 percent of Si, 1.05 to 1.15 percent of Mn, less than 0.01 percent of P, less than 0.002 percent of S, 0.025 to 0.035 percent of Nb, 0.015 to 0.025 percent of Ti, less than 0.05 percent of Al, less than 0.006 percent of Ca, and the balance of Fe and inevitable trace impurities.
The rolling process comprises the following steps: the outlet temperature of the final pass of rough rolling is set to be 1015-1050 ℃, the reduction rate of the last pass of the rough rolling stage is 25.5-26.5%, and the accumulated reduction rate of the rough rolling is 73.5-76.7%; the inlet temperature of the finish rolling is set to be 960-995 ℃; the first pass reduction rate of finish rolling is 21.5-23.8%, and the cumulative reduction rate of finish rolling is 68.1-70.8%; the finishing temperature is set to be between 815 and 835 ℃; the coiling temperature is set to be 470-490 ℃.
The cooling procedure adopts a non-feedback centralized cooling mode, the number of boiled water groups is calculated before the finish rolling end frame is threaded, the calculated amount of the model is reduced, and the stability of the model is improved. Setting the water quantity ratio of the laminar cooling upper and lower cooling headers to be (0.86-0.93): 1, the cooling strength of the upper surface and the lower surface of the steel strip is balanced, the uniformity of the structure and the performance is ensured, and the plate shape problems of C warp, bow back and the like are avoided.
Because the steel strip is short, the cooling model has no feedback, and the cooling model can be further optimized by adopting constant-speed rolling. However, in order to provide certain tension for the steel strip to ensure the plate shape and the centering degree, the roller way speed is slightly higher than the steel strip speed, so that the steel strip still has certain acceleration, and the roller way speed is set to be 0.008-0.012 m/s relative to the acceleration of the steel strip2The method not only ensures the shape and the centering degree of the steel strip, but also prevents the model from being disordered due to overlarge speed change of the steel strip and excessive added cooling collecting pipes, and ensures the cooling uniformity in the length direction of the steel strip.
The invention is further illustrated by the following specific examples:
table 1 shows the chemical compositions of the large-wall-thickness acid-resistant pipeline steel continuous casting slabs of examples 1 to 8.
TABLE 1 chemical composition (wt,%) of examples 1 to 8
The specific process parameters are shown in table 2:
TABLE 2 Process parameters of the manufacturing method of each example
The above examples were subjected to performance tests, and the results of the main performance tests are shown in Table 3, and the main HIC-resistant and SSCC-resistant properties are shown in Table 4.
TABLE 3 Main Performance test results of the examples
TABLE 4 results of the performance test of HIC and SSCC resistance of each example
From the results in tables 3 and 4, it can be seen that the present invention can achieve low cost, large wall thickness, and stable structure and performance of the acid-resistant pipeline steel in a low-composition system as a whole by the combined control of the components and the process. The invention has the advantages of lower cost, higher strength, thicker specification, more stable and excellent performance, small production difficulty and greatly improved production efficiency and process cost control.
As can be seen from FIGS. 2 to 9, the structure is mainly ferrite + bainite, wherein the volume ratio of ferrite + bainite is more than 95%, the mixed crystal phenomenon is avoided, the grain size is 11.5 grade, and the grains are fine. Ferrite + bainite structure and fine grains can better play a role in fine-grain strengthening. Examples 1 to 6 were not banded, and examples 7 and 8 were ranked 0.5 banded (see fig. 8 to 9). The formation of pearlite bands is disadvantageous in terms of hydrogen induced cracking resistance, and although the HIC resistance of examples 7 and 8 is acceptable, there are already minute hydrogen induced cracks.
When C is less than or equal to 0.04 (examples 1 and 2), the performance is low and the yield ratio is high; when C > 0.07% (examples 7 and 8), although the HIC resistance is acceptable, there is slight hydrogen induced cracking, and a preferable range of the optimum C content is 0.05% to 0.067% in view of the practical control level of steel making.
Claims (9)
1. The low-cost large-wall-thickness acid-resistant pipeline steel with stable structure and performance is characterized in that: the pipeline steel comprises the following main components in percentage by weight: 0.03 to 0.08 percent of C, 0.15 to 0.20 percent of Si, 1.05 to 1.15 percent of Mn, less than 0.01 percent of P, less than 0.002 percent of S, 0.025 to 0.035 percent of Nb, 0.015 to 0.025 percent of Ti, less than 0.05 percent of Al, less than 0.006 percent of Ca, and the balance of Fe and inevitable trace impurities.
2. The low-cost, large-wall thickness, acid-resistant pipeline steel of claim 1, which is stable in structure and performance, wherein: the preferable range of the C content is as follows: 0.05wt% -0.067 wt%.
3. The low-cost large-wall-thickness acid-resistant pipeline steel with stable structure and performance as claimed in claim 1, wherein the thickness of the pipeline steel strip is 17-19 mm, the structure is mainly ferrite and bainite, the volume ratio of the ferrite to the bainite is more than 95%, and the grain size is 11-12 grades.
4. The production method of the low-cost large-wall-thickness acid-resistant pipeline steel with stable structure and performance comprises the working procedures of steel making, continuous casting, rolling, coiling and cooling; the method is characterized in that: the continuous casting process comprises the following steps: the casting blank comprises the following main components in percentage by weight: 0.03 to 0.08 percent of C, preferably 0.05 to 0.067 percent; 0.15 to 0.20 percent of Si, 1.05 to 1.15 percent of Mn, less than 0.01 percent of P, less than 0.002 percent of S, 0.025 to 0.035 percent of Nb, 0.015 to 0.025 percent of Ti, less than 0.05 percent of Al, less than 0.006 percent of Ca, and the balance of Fe and inevitable trace impurities.
5. The method for producing the acid-resistant pipeline steel with stable structure and performance and low cost and large wall thickness according to claim 4, wherein: the rolling process comprises the following steps: the outlet temperature of the final pass of rough rolling is set to be 1015-1050 ℃, and the inlet temperature of finish rolling is set to be 960-995 ℃; the finishing temperature is set to be 815-835 ℃.
6. The method for producing the acid-resistant pipeline steel with stable structure and performance and low cost and large wall thickness according to claim 4, wherein: in the coiling procedure, the coiling temperature is set to be 470-490 ℃.
7. The method for producing the acid-resistant pipeline steel with stable structure and performance and low cost and large wall thickness according to claim 4 or 5, wherein: the rolling process comprises the following steps: the final pass reduction rate of the rough rolling stage is 25.5-26.5%, and the accumulated reduction rate of the rough rolling is 73.5-76.7%; the first pass reduction rate of finish rolling is 21.5-23.8%, and the cumulative reduction rate of finish rolling is 68.1-70.8%.
8. The method for producing the acid-resistant pipeline steel with stable structure and performance and low cost and large wall thickness according to claim 4 or 5, wherein: in the rolling process, the roller way speed is greater than the steel strip speed, and the roller way speed is 0.008-0.012 m/s relative to the steel strip acceleration2。
9. The method for producing the acid-resistant pipeline steel with stable structure and performance and low cost and large wall thickness according to claim 4, wherein: in the cooling process, the water quantity ratio of the laminar cooling upper and lower cooling collecting pipes is set to be (0.86-0.93): 1.
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| CN112708824A (en) * | 2020-12-07 | 2021-04-27 | 邯郸钢铁集团有限责任公司 | Production method of hot-rolled thin-specification Gepa-grade high-strength steel |
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