CN112281072A - X60/X65-grade acid-resistant pipeline steel and preparation method thereof - Google Patents
X60/X65-grade acid-resistant pipeline steel and preparation method thereof Download PDFInfo
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Abstract
An X60/X65-grade acid-resistant pipeline steel and a preparation method thereof belong to the technical field of ferrous metallurgy. The chemical components and the mass percentage content are as follows: c: 0.02-0.06%, Si: 0.10-0.20%, Mn is less than or equal to 0.90%, Al: 0.020 to 0.050%, Nb: 0.060 to 0.080 percent of Ti, less than or equal to 0.020 percent of Cr, less than or equal to 0.30 percent of Ni, less than or equal to 0.20 percent of Cu, less than or equal to 0.40 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.0060 percent of N, less than or equal to 0.0005 percent of B, less than or equal to 1.2 percent of Mn and Cr, and the balance of iron and inevitable impurity elements. Aiming at the problems of higher cost, higher smelting difficulty, poor control of acid resistance and the like of the existing component design and manufacturing method, the invention develops a production and manufacturing method of X60/X65 grade acid-resistant pipeline steel which is easy to smelt and produce, and has important effects on reducing production and manufacturing cost, reducing production difficulty, improving qualification rate and controlling performance uniformity.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to X60/X65-grade acid-resistant pipeline steel and a preparation method thereof.
Background
With the increasing of oil gas demand, the construction of oil gas pipeline is growing constantly, and non-acid-resistant pipeline needs to carry out dehydrogenation treatment to the medium in service, is about to "sour gas" change into "sweet gas", has also increased the cost when increasing the process. The acid-resistant pipeline does not need a dehydrogenation process, so that the cost is saved, the process can be simplified, but the acid-resistant pipeline steel generally belongs to the steel grade with relatively less pipeline steel application at present, the domestic large-scale application is particularly less, and the smelting difficulty is extremely high because the acid-resistant pipeline steel has extremely high requirement on the content of P, S elements, particularly S elements, and when the content of the S elements exceeds 0.0015%, the Ca/S ratio is usually required.
The acid-resistant pipeline steel is usually designed by adopting low-carbon and low-manganese components, so that the carbon equivalent is greatly lower than that of the pipeline steel of the same steel grade, and other precious elements, particularly Mo element, are added to ensure the strength, so that the cost is higher, and the large-scale popularization and application of the acid-resistant pipeline steel are not facilitated.
Disclosure of Invention
The technical problem to be solved is as follows: aiming at the problems of high cost, high smelting difficulty, poor control of acid resistance and the like of the existing component design and preparation method, the invention provides the X60/X65-grade acid-resistant pipeline steel and the preparation method thereof, which can reduce the production and manufacturing cost, reduce the production difficulty, and improve the qualification rate and the control performance uniformity.
The technical scheme is as follows: an X60/X65-grade acid-resistant pipeline steel comprises the following chemical components in percentage by mass: c: 0.02-0.06%, Si: 0.10-0.20%, Mn is less than or equal to 0.90%, Al: 0.020 to 0.050%, Nb: 0.060 to 0.080 percent of Ti, less than or equal to 0.020 percent of Cr, less than or equal to 0.30 percent of Ni, less than or equal to 0.20 percent of Cu, less than or equal to 0.40 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.0060 percent of N, less than or equal to 0.0005 percent of B, less than or equal to 1.2 percent of Mn and Cr, and the balance of iron and inevitable impurity elements.
Preferably, the chemical components and the mass percentage content are as follows: c: 0.04-0.06%, Si: 0.15 to 0.16%, Mn 0.76 to 0.79%, Al: 0.032-0.036%, Nb: 0.070-0.074%, Ti: 0.015-0.016%, Cr: 0.26 to 0.27%, Ni: 0.13-0.14%, Cu: 0.28-0.31%, P: 0.008-0.010%, S: 0.001%, N: 0.0019-0.0023%, B: 0.0001%, and the balance of iron and inevitable impurity elements, Ceq: 0.26-0.27%, Pcm: 0.12 to 0.14 percent.
The preparation method of the X60/X65-grade acid-resistant pipeline steel comprises the following steps: the method comprises the steps of preparing steel type components, performing KR pre-desulfurization on molten iron, smelting in a converter, LF refining, RH vacuum treatment, wire feeding, soft stirring, plate blank continuous casting, plate blank reheating, rough rolling, intermediate blank temperature-waiting cooling, finish rolling, steel plate cooling, steel plate straightening, off-line stack cooling and stack discharging and ultrasonic flaw detection in sequence, wherein when the steel type components are prepared, the components are prepared according to claim 1; after the KR desulfurization treatment of the molten iron, the S content of the molten iron is less than or equal to 0.010 percent; after LF refining treatment, the content of S in the molten steel is less than or equal to 0.005 percent; after RH vacuum treatment, the H content in the steel is less than 2 ppm; in the wire feeding stage, a pure Ca wire is fed for 300-; in the slab continuous casting stage, non-oxidation protection casting is adopted, wherein the superheat degree of a tundish is controlled at 25 +/-5 ℃, and the drawing speed is 1.4-1.6 m/min; in the slab reheating stage, the temperature is controlled to be 1120-1220 ℃, and the furnace time is not less than 1.0 min/mm; in the rough rolling stage, the rough rolling temperature is controlled to be less than or equal to 1100 ℃, and the thickness of the intermediate blank after rough rolling is more than 1.5 times that of the steel plate; in the finish rolling stage, the finish rolling temperature is controlled below 980 ℃, the finish rolling temperature is not less than 820 ℃, and the total compression ratio in the finish rolling stage is not less than 40%.
Preferably, after the KR desulfurization treatment of the molten iron, the S content of the molten iron is 0.005 percent; after LF refining treatment, the content of S in the molten steel is 0.002%; after RH vacuum treatment, the H content in the steel is 1.4-1.6 ppm; in the wire feeding stage, feeding a pure Ca wire 395-452 m, and carrying out soft stirring for 13-13.5 min; in the slab continuous casting stage, non-oxidation protection casting is adopted, wherein the superheat degree of a tundish is controlled at 26-27 ℃, and the drawing speed is 1.4-1.6 m/min; in the slab reheating stage, the temperature is controlled to be 1178-1195 ℃, and the in-furnace time is not less than 1.0 min/mm; in the rough rolling stage, the rough rolling temperature is controlled to be 1045-1055 ℃, and the thickness of the intermediate blank after rough rolling is more than 1.5 times that of the steel plate; and in the finish rolling stage, the finish rolling temperature is controlled to be 968-980 ℃, the finish rolling temperature is 835-850 ℃, and the total compression ratio in the finish rolling stage is more than or equal to 40%.
Preferably, the steel plate cooling stage is that the final cooling temperature is less than 500 ℃, and the cooling speed is controlled to be more than 30 ℃/s.
Preferably, in the steel plate cooling stage, the final cooling temperature is 420-480 ℃, and the cooling speed is controlled at 30-33 ℃/s.
Preferably, after the steel sheet is cooled, the steel sheet is air-cooled to room temperature on a cooling bed.
Has the advantages that: 1. the component design of the invention does not meet the requirement of Ca/S, and the smelting difficulty is reduced;
2. aiming at the problems of higher cost, higher smelting difficulty, poor control of acid resistance and the like of the existing component design and manufacturing method, the invention develops a production and manufacturing method of X60/X65 grade acid-resistant pipeline steel which is easy to smelt and produce, and has important effects on reducing production and manufacturing cost, reducing production difficulty, improving qualification rate and controlling performance uniformity.
Drawings
FIG. 1 is a close-surface metallographic structure of 18 mmX65MS thick, obtained in example 3 of the present invention;
FIG. 2 is a metallographic structure diagram of a steel plate having a thickness 1/4 and a thickness of 18 mmX65MS obtained in example 3;
FIG. 3 is a metallographic structure diagram of a steel plate having a thickness 1/2 and a thickness of 18 mmX65MS obtained in example 3.
Detailed Description
The invention is further described below with reference to the accompanying drawings and specific embodiments.
Example 1
In the embodiment, the X60/X65-grade acid-resistant pipeline steel comprises the following chemical components in percentage by mass: c: 0.04%, Si: 0.15%, Mn:0.79%, Al: 0.032%, Nb: 0.071%, Ti: 0.015%, Cr: 0.27%, Ni: 0.14%, Cu: 0.31%, P: 0.008%, S: 0.001%, N: 0.0023%, B: 0.0001%, and the balance of iron and inevitable impurity elements, Ceq: 0.26%, Pcm: 0.12 percent.
The preparation method of the X60/X65-grade acid-resistant pipeline steel comprises the following steps: the method comprises the steps of preparing steel type components, performing KR pre-desulfurization on molten iron, smelting in a converter, LF refining, RH vacuum treatment, wire feeding, soft stirring, slab continuous casting, slab reheating, rough rolling, intermediate slab temperature-waiting cooling, finish rolling, steel plate cooling, steel plate straightening, off-line stack cooling and stack discharging and ultrasonic flaw detection in sequence, wherein the steel type components are prepared according to the components when being prepared; after the KR desulfurization treatment of the molten iron, the S content of the molten iron is 0.005 percent; after LF refining treatment, the content of S in the molten steel is 0.002%; after RH vacuum treatment, the H content in the steel is 1.6 ppm; in the wire feeding stage, a pure Ca wire 421 m is fed and soft stirring is carried out for 13.5 min; in the slab continuous casting stage, non-oxidation protection casting is adopted, wherein the superheat degree of a tundish is controlled at 26 ℃, and the casting speed is 1.4-1.6 m/min; in the slab reheating stage, the temperature is controlled at 1195 ℃, and the in-furnace time is not less than 1.0 min/mm; in the rough rolling stage, the rough rolling temperature is controlled at 1050 ℃, the thickness of the intermediate blank after rough rolling is more than 1.5 times that of the steel plate, and the thickness of the intermediate blank is 40 mm; in the finish rolling stage, the finish rolling temperature is controlled to be 975 ℃, the finish rolling temperature is 835 ℃, and the total compression ratio in the finish rolling stage is more than or equal to 40%. And in the steel plate cooling stage, the final cooling temperature is 480 ℃, and the cooling speed is controlled at 30 ℃/s. After the steel plate is cooled, the steel plate is air-cooled to room temperature on a cooling bed.
Example 2
In the embodiment, the X60/X65-grade acid-resistant pipeline steel comprises the following chemical components in percentage by mass: c: 0.05%, Si: 0.16%, Mn: 0.78%, Al: 0.034%, Nb: 0.074%, Ti: 0.015%, Cr: 0.26%, Ni: 0.14%, Cu: 0.30%, P: 0.008%, S: 0.001%, N: 0.0019%, B: 0.0001%, and the balance of iron and inevitable impurity elements, Ceq: 0.27%, Pcm: 0.13 percent.
The preparation method of the X60/X65-grade acid-resistant pipeline steel comprises the following steps: the method comprises the steps of preparing steel type components, performing KR pre-desulfurization on molten iron, smelting in a converter, LF refining, RH vacuum treatment, wire feeding, soft stirring, slab continuous casting, slab reheating, rough rolling, intermediate slab temperature-waiting cooling, finish rolling, steel plate cooling, steel plate straightening, off-line stack cooling and stack discharging and ultrasonic flaw detection in sequence, wherein the steel type components are prepared according to the components when being prepared; after the KR desulfurization treatment of the molten iron, the S content of the molten iron is 0.005 percent; after LF refining treatment, the content of S in the molten steel is 0.002%; after RH vacuum treatment, the H content in the steel is 1.4 ppm; in the wire feeding stage, 395 m of pure Ca wire is fed and soft stirring is carried out for 13.5 min; in the slab continuous casting stage, non-oxidation protection casting is adopted, wherein the superheat degree of a tundish is controlled at 26 ℃, and the casting speed is 1.4-1.6 m/min; in the slab reheating stage, the temperature is controlled at 1190 ℃, and the in-furnace time is not less than 1.0 min/mm; in the rough rolling stage, the rough rolling temperature is controlled to be 1045 ℃, the thickness of the intermediate blank after rough rolling is more than 1.5 times of the thickness of the steel plate, and the thickness of the intermediate blank is 50 mm; in the finish rolling stage, the finish rolling temperature is controlled to be 980 ℃, the finish rolling temperature is 843 ℃, and the total compression ratio in the finish rolling stage is more than or equal to 40%. And in the steel plate cooling stage, the final cooling temperature is 450 ℃, and the cooling speed is controlled at 31 ℃/s. After the steel plate is cooled, the steel plate is air-cooled to room temperature on a cooling bed.
Example 3
In the embodiment, the X60/X65-grade acid-resistant pipeline steel comprises the following chemical components in percentage by mass: c: 0.06%, Si: 0.16%, Mn:0.76%, Al: 0.036%, Nb: 0.070%, Ti: 0.016%, Cr: 0.26%, Ni: 0.13%, Cu: 0.28%, P: 0.010%, S: 0.001%, N: 0.0019%, B: 0.0001%, and the balance of iron and inevitable impurity elements, Ceq: 0.27%, Pcm: 0.14 percent.
The preparation method of the X60/X65-grade acid-resistant pipeline steel comprises the following steps: the method comprises the steps of preparing steel type components, performing KR pre-desulfurization on molten iron, smelting in a converter, LF refining, RH vacuum treatment, wire feeding, soft stirring, slab continuous casting, slab reheating, rough rolling, intermediate slab temperature-waiting cooling, finish rolling, steel plate cooling, steel plate straightening, off-line stack cooling and stack discharging and ultrasonic flaw detection in sequence, wherein the steel type components are prepared according to the components when being prepared; after the KR desulfurization treatment of the molten iron, the S content of the molten iron is 0.005 percent; after LF refining treatment, the content of S in the molten steel is 0.002%; after RH vacuum treatment, the H content in the steel is 1.5 ppm; in the wire feeding stage, feeding pure Ca wires 452 m, and carrying out soft stirring for 13 min; in the slab continuous casting stage, non-oxidation protection casting is adopted, wherein the superheat degree of a tundish is controlled at 27 ℃, and the casting speed is 1.4-1.6 m/min; in the slab reheating stage, the temperature is controlled to be 1178 ℃, and the furnace time is not less than 1.0 min/mm; in the rough rolling stage, the rough rolling temperature is controlled to 1055 ℃, the thickness of the intermediate blank after rough rolling is more than 1.5 times of the thickness of the steel plate, and the thickness of the intermediate blank is 35 mm; in the finish rolling stage, the finish rolling temperature is controlled at 968 ℃, the finish rolling temperature is 850 ℃, and the total compression ratio in the finish rolling stage is more than or equal to 40%. And in the steel plate cooling stage, the final cooling temperature is 420 ℃, and the cooling speed is controlled at 33 ℃/s. After the steel plate is cooled, the steel plate is air-cooled to room temperature on a cooling bed.
Example 4
In the embodiment, the X60/X65-grade acid-resistant pipeline steel comprises the following chemical components in percentage by mass: c: 0.02%, Si: 0.10%, Mn is less than or equal to 0.90%, Al: 0.020%, Nb: 0.060 percent, less than or equal to 0.020 percent of Ti, less than or equal to 0.30 percent of Cr, less than or equal to 0.20 percent of Ni, less than or equal to 0.40 percent of Cu, less than or equal to 0.012 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.0060 percent of N, less than or equal to 0.0005 percent of B, less than or equal to 1.2 percent of Mn + Cr, and the balance of iron and.
The preparation method of the X60/X65-grade acid-resistant pipeline steel comprises the following steps: the method comprises the steps of preparing steel type components, performing KR pre-desulfurization on molten iron, smelting in a converter, LF refining, RH vacuum treatment, wire feeding, soft stirring, slab continuous casting, slab reheating, rough rolling, intermediate slab temperature-waiting cooling, finish rolling, steel plate cooling, steel plate straightening, off-line stack cooling and stack discharging and ultrasonic flaw detection in sequence, wherein the steel type components are prepared according to the components when being prepared; after the KR desulfurization treatment of the molten iron, the S content of the molten iron is less than or equal to 0.010 percent; after LF refining treatment, the content of S in the molten steel is less than or equal to 0.005 percent; after RH vacuum treatment, the H content in the steel is less than 2 ppm; in the wire feeding stage, 300 m of pure Ca wire is fed, and soft stirring is carried out for not less than 12 min; in the slab continuous casting stage, non-oxidation protection pouring is adopted, wherein the superheat degree of a tundish is controlled at 20 ℃, and the drawing speed is 1.4 m/min; in the slab reheating stage, the temperature is controlled to be 1120 ℃, and the in-furnace time is not less than 1.0 min/mm; in the rough rolling stage, the rough rolling temperature is controlled to be less than or equal to 1100 ℃, and the thickness of the intermediate blank after rough rolling is more than 1.5 times that of the steel plate; in the finish rolling stage, the finish rolling temperature is controlled below 980 ℃, the finish rolling temperature is not less than 820 ℃, and the total compression ratio in the finish rolling stage is not less than 40%. And in the steel plate cooling stage, the final cooling temperature is less than 500 ℃, and the cooling speed is controlled to be more than 30 ℃/s.
Example 5
In the embodiment, the X60/X65-grade acid-resistant pipeline steel comprises the following chemical components in percentage by mass: c: 0.06%, Si: 0.20 percent, Mn is less than or equal to 0.90 percent, Al: 0.050%, Nb: 0.080 percent, less than or equal to 0.020 percent of Ti, less than or equal to 0.30 percent of Cr, less than or equal to 0.20 percent of Ni, less than or equal to 0.40 percent of Cu, less than or equal to 0.012 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.0060 percent of N, less than or equal to 0.0005 percent of B, less than or equal to 1.2 percent of Mn + Cr, and the balance of iron and.
The preparation method of the X60/X65-grade acid-resistant pipeline steel comprises the following steps: the method comprises the steps of preparing steel type components, performing KR pre-desulfurization on molten iron, smelting in a converter, LF refining, RH vacuum treatment, wire feeding, soft stirring, slab continuous casting, slab reheating, rough rolling, intermediate slab temperature-waiting cooling, finish rolling, steel plate cooling, steel plate straightening, off-line stack cooling and stack discharging and ultrasonic flaw detection in sequence, wherein the steel type components are prepared according to the components when being prepared; after the KR desulfurization treatment of the molten iron, the S content of the molten iron is less than or equal to 0.010 percent; after LF refining treatment, the content of S in the molten steel is less than or equal to 0.005 percent; after RH vacuum treatment, the H content in the steel is less than 2 ppm; in the wire feeding stage, feeding pure Ca wires for 500 m, and carrying out soft stirring for not less than 12 min; in the slab continuous casting stage, non-oxidation protection pouring is adopted, wherein the superheat degree of a tundish is controlled at 30 ℃, and the drawing speed is 1.6 m/min; in the slab reheating stage, the temperature is controlled at 1220 ℃, and the in-furnace time is not less than 1.0 min/mm; in the rough rolling stage, the rough rolling temperature is controlled to be less than or equal to 1100 ℃, and the thickness of the intermediate blank after rough rolling is more than 1.5 times that of the steel plate; in the finish rolling stage, the finish rolling temperature is controlled below 980 ℃, the finish rolling temperature is not less than 820 ℃, and the total compression ratio in the finish rolling stage is not less than 40%. And in the steel plate cooling stage, the final cooling temperature is less than 500 ℃, and the cooling speed is controlled to be more than 30 ℃/s.
In examples 1 to 3, the control parameters of the smelting heat and the process of the mother plate rolling are shown in table 1, the smelting components of the smelting heat are shown in table 2, the mechanical properties of the hot rolling mother plate are shown in table 3, and the specification and the size of the steel plate prepared in examples 1 to 3 are shown in table 4.
Table 1: examples 1 to 3 smelting heat and mother plate Rolling Process control parameters
Table 2: examples 1 to 3 smelting compositions of the smelting Heat
Note: minor amounts V, Mo in the table default to impurities
Table 3: examples 1 to 3 mechanical properties of the hot-rolled mother sheet:
table 4: steel sheet dimensions of examples 1 to 3
The structure photographs of the steel sheet prepared in example 3 are shown in fig. 1 to 3, fig. 1 is a photograph of the structure of the near-surface steel sheet, fig. 2 is a photograph of the structure of the steel sheet at a thickness of 1/4, and fig. 3 is a photograph of the structure of the steel sheet at a thickness of 1/2, and it can be seen from the drawings that the example obtained a single-phase structure mainly composed of a small amount of bulk ferrite and acicular ferrite, had no distinct structure segregation zone and hard phase structure, had good structure uniformity, could avoid the enrichment of hydrogen atoms in the aggregate, and thus had good acid resistance.
Claims (7)
1. An X60/X65-grade acid-resistant pipeline steel is characterized by comprising the following chemical components in percentage by mass: c: 0.02-0.06%, Si: 0.10-0.20%, Mn is less than or equal to 0.90%, Al: 0.020 to 0.050%, Nb: 0.060 to 0.080 percent of Ti, less than or equal to 0.020 percent of Cr, less than or equal to 0.30 percent of Ni, less than or equal to 0.20 percent of Cu, less than or equal to 0.40 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.0060 percent of N, less than or equal to 0.0005 percent of B, less than or equal to 1.2 percent of Mn and Cr, and the balance of iron and inevitable impurity elements.
2. The X60/X65-grade acid-resistant pipeline steel as claimed in claim 1, which comprises the following chemical components in percentage by mass: c: 0.04-0.06%, Si: 0.15 to 0.16%, Mn 0.76 to 0.79%, Al: 0.032-0.036%, Nb: 0.070-0.074%, Ti: 0.015-0.016%, Cr: 0.26 to 0.27%, Ni: 0.13-0.14%, Cu: 0.28-0.31%, P: 0.008-0.010%, S: 0.001%, N: 0.0019-0.0023%, B: 0.0001%, and the balance of iron and inevitable impurity elements, Ceq: 0.26-0.27%, Pcm: 0.12 to 0.14 percent.
3. The preparation method of the X60/X65 grade acid-resistant pipeline steel based on claim 1, characterized by comprising the following steps: the method comprises the steps of preparing steel type components, performing KR pre-desulfurization on molten iron, smelting in a converter, LF refining, RH vacuum treatment, wire feeding, soft stirring, plate blank continuous casting, plate blank reheating, rough rolling, intermediate blank temperature-waiting cooling, finish rolling, steel plate cooling, steel plate straightening, off-line stack cooling and stack discharging and ultrasonic flaw detection in sequence, wherein when the steel type components are prepared, the components are prepared according to claim 1; after the KR desulfurization treatment of the molten iron, the S content of the molten iron is less than or equal to 0.010 percent; after LF refining treatment, the content of S in the molten steel is less than or equal to 0.005 percent; after RH vacuum treatment, the H content in the steel is less than 2 ppm; in the wire feeding stage, a pure Ca wire is fed for 300-; in the slab continuous casting stage, non-oxidation protection casting is adopted, wherein the superheat degree of a tundish is controlled at 25 +/-5 ℃, and the drawing speed is 1.4-1.6 m/min; in the slab reheating stage, the temperature is controlled to be 1120-1220 ℃, and the furnace time is not less than 1.0 min/mm; in the rough rolling stage, the rough rolling temperature is controlled to be less than or equal to 1100 ℃, and the thickness of the intermediate blank after rough rolling is more than 1.5 times that of the steel plate; in the finish rolling stage, the finish rolling temperature is controlled below 980 ℃, the finish rolling temperature is not less than 820 ℃, and the total compression ratio in the finish rolling stage is not less than 40%.
4. The method for preparing X60/X65-grade acid-resistant pipeline steel as claimed in claim 3, wherein the molten iron has an S content of 0.005% after KR desulfurization; after LF refining treatment, the content of S in the molten steel is 0.002%; after RH vacuum treatment, the H content in the steel is 1.4-1.6 ppm; in the wire feeding stage, feeding a pure Ca wire 395-452 m, and carrying out soft stirring for 13-13.5 min; in the slab continuous casting stage, non-oxidation protection casting is adopted, wherein the superheat degree of a tundish is controlled at 26-27 ℃, and the drawing speed is 1.4-1.6 m/min; in the slab reheating stage, the temperature is controlled to be 1178-1195 ℃, and the in-furnace time is not less than 1.0 min/mm; in the rough rolling stage, the rough rolling temperature is controlled to be 1045-1055 ℃, and the thickness of the intermediate blank after rough rolling is more than 1.5 times that of the steel plate; and in the finish rolling stage, the finish rolling temperature is controlled to be 968-980 ℃, the finish rolling temperature is 835-850 ℃, and the total compression ratio in the finish rolling stage is more than or equal to 40%.
5. The method for preparing X60/X65 grade acid-resistant pipeline steel as claimed in claim 3, wherein the final cooling temperature of the steel plate in the cooling stage is less than 500 ℃, and the cooling speed is controlled to be more than 30 ℃/s.
6. The preparation method of X60/X65 acid-resistant pipeline steel as claimed in claim 5, wherein the final cooling temperature of the steel plate in the cooling stage is 420-480 ℃, and the cooling speed is controlled at 30-33 ℃/s.
7. The method for preparing X60/X65 grade acid-resistant pipeline steel as claimed in claim 3, wherein the steel plate is cooled and then air-cooled to room temperature on a cooling bed.
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