CN114231718A - Pipeline steel with narrow strength and same plate difference and production method thereof - Google Patents
Pipeline steel with narrow strength and same plate difference and production method thereof Download PDFInfo
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- CN114231718A CN114231718A CN202111370037.XA CN202111370037A CN114231718A CN 114231718 A CN114231718 A CN 114231718A CN 202111370037 A CN202111370037 A CN 202111370037A CN 114231718 A CN114231718 A CN 114231718A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 119
- 239000010959 steel Substances 0.000 title claims abstract description 119
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 124
- 238000000034 method Methods 0.000 claims abstract description 49
- 238000005096 rolling process Methods 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000010926 purge Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 230000001133 acceleration Effects 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 2
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- 238000002360 preparation method Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 230000002411 adverse Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 229910001563 bainite Inorganic materials 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
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- 239000007789 gas Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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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
- C21D8/0242—Flattening; Dressing; Flexing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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Abstract
The invention particularly relates to a pipeline steel with narrow strength equal to plate difference and a production method thereof, belonging to the technical field of steel preparation, and the method comprises the following steps: carrying out temperature control and rolling control treatment on the steel billet to obtain a steel plate; pre-straightening the steel plate to obtain a straightened steel plate; carrying out ultra-fast cooling on the straightening steel plate to obtain pipeline steel; the starting cooling temperature of the ultra-fast cooling is 720-750 ℃, the final cooling temperature of the ultra-fast cooling is 520-560 ℃, the cooling speed of the ultra-fast cooling is 40-50 ℃/s, the head of the straightening steel plate is shielded in the ultra-fast cooling process, the shielding coefficient of the shielding is 0.6-0.8, and the shielding length of the shielding is 3000-4000 mm; by adopting the pre-straightening and ultra-fast cooling process to replace the traditional ACC laminar cooling process, the control of the same narrow strength and plate difference of TMCP pipeline steel is realized, the product quality and the product percent of pass are improved, and the safety of pipeline engineering is ensured.
Description
Technical Field
The invention belongs to the technical field of steel preparation, and particularly relates to pipeline steel with narrow strength and same plate difference and a production method thereof.
Background
The L450M (or X65M) pipeline steel is a common variety of steel plate (pipeline steel) for petroleum and natural gas conveying pipes, the steel plate with the thickness of 10mm to 20mm is a common specification in engineering, and at present, the traditional ACC laminar cooling is adopted in the water cooling process after rolling in the method for preparing the pipeline steel, the start cooling temperature is 750-780 ℃, the finish cooling temperature is 520 +/-20 ℃, and the cooling speed is 15-30 ℃/s.
However, in the conventional ACC laminar cooling process, the water cooling pressure and the cooling speed are low, the deviation of the open cooling temperature of the head and the tail of the steel plate is large, and the head and tail shielding function cannot be accurately executed in the water cooling process, so that the difference between the tensile strength and the plate in the length direction of the steel plate is large, and the difference between the tensile strength and the plate is about 60-120MPa generally; the same plate difference of the strength is large, the production difficulty of the pipe manufacturing process is increased, the integral stress of the pipeline after the pipe is welded is increased, and the engineering quality and the engineering safety are not facilitated.
Disclosure of Invention
The application aims to provide pipeline steel with the same narrow strength and the same plate difference and a production method thereof, and the problem that the length direction tensile strength of a steel plate is large in the same plate difference due to the adoption of an ACC laminar cooling process at present is solved.
The embodiment of the invention provides a production method of pipeline steel with narrow strength equal to plate difference, which comprises the following steps:
carrying out temperature control and rolling control treatment on the steel billet to obtain a steel plate;
pre-straightening the steel plate to obtain a straightened steel plate;
carrying out ultra-fast cooling on the straightening steel plate to obtain pipeline steel; the initial cooling temperature of the ultra-fast cooling is 750-780 ℃, the final cooling temperature of the ultra-fast cooling is 450-550 ℃, the cooling speed of the ultra-fast cooling is 40-50 ℃/s, the head of the straightening steel plate is shielded in the ultra-fast cooling process, the shielding coefficient of the shielding is 0.6-0.8, and the shielding length of the shielding is 3000-4000 mm.
Optionally, in the pre-straightening, the forward tilting amount is 2.0mm to 3.0mm, the straightening force of the pre-straightening is 200t to 240t, and the straightening temperature of the pre-straightening is 730 ℃ to 800 ℃.
Optionally, the biting speed of the pre-straightening is 0.6m/s-1.0m/s, and the straightening speed of the pre-straightening is 1.2m/s-1.8 m/s.
Optionally, in the ultra-fast cooling, the number of the working ultra-fast cooling high-density headers is 4-15, the water pressure of the ultra-fast cooling high-density headers is 1.8Bar-2.2Bar, and the water amount of the high-density nozzles of the ultra-fast cooling high-density headers is 140m3/h-180m3The water ratio of the ultra-fast cooling high-density header is 1.3 times to 1.7 times.
Optionally, the roller speed of the ultra-fast cooling is 1.5m/s-1.6m/s, and the acceleration of the ultra-fast cooling is 0.002m/s-0.004 m/s.
Optionally, in the ultra-fast cooling, at least 1 group of side spraying and air purging is started.
Optionally, the method further includes: and heating the steel billet, wherein the tapping temperature of the heating is 1160-1170 ℃, and the heating time is 275-295 min.
Optionally, the temperature control thickness of the blank subjected to temperature control and rolling control is 55mm-60 mm.
Optionally, the temperature of the controlled temperature and controlled rolling is 900-930 ℃, and the finishing temperature of the controlled temperature and controlled rolling is 830-860 ℃.
Based on the same inventive concept, the embodiment of the invention also provides the pipeline steel with the same narrow strength and the same plate difference, the pipeline steel is prepared by the production method of the pipeline steel with the same narrow strength and the same plate difference, the pipeline steel is L450M pipeline steel or X65M pipeline steel, and the tensile strength and the same plate difference of the pipeline steel is 20MPa-60 MPa.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the production method of the pipeline steel with the narrow strength equal to or different from that of the plate, provided by the embodiment of the invention, comprises the following steps: carrying out temperature control and rolling control treatment on the steel billet to obtain a steel plate; pre-straightening the steel plate to obtain a straightened steel plate; carrying out ultra-fast cooling on the straightening steel plate to obtain pipeline steel; the initial cooling temperature of the ultra-fast cooling is 720-750 ℃, the final cooling temperature of the ultra-fast cooling is 520-560 ℃, the cooling speed of the ultra-fast cooling is 40-50 ℃/s, the head of the straightening steel plate is shielded in the ultra-fast cooling process, the shielding coefficient of the shielding is 0.6-0.8, and the shielding length of the shielding is 3000-4000 mm; by adopting the pre-straightening and ultra-fast cooling process to replace the traditional ACC laminar cooling process, the control of the same narrow strength and plate difference of TMCP pipeline steel is realized, the product quality and the product percent of pass are improved, and the safety of pipeline engineering is ensured.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a method provided by an embodiment of the present invention;
FIG. 2 is a graph showing the final cooling temperature of a steel sheet provided in example 1 of the present invention;
FIG. 3 is a cloud chart of the final cooling temperature of a steel plate provided in example 1 of the present invention;
FIG. 4 is a graph showing a final cooling temperature of a steel sheet according to comparative example 1 of the present invention;
FIG. 5 is a cloud chart of the final cooling temperature of the steel sheet according to comparative example 1 of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The execution standard of the L450M (or X65M) pipeline steel is GB21237 Wide and Thick steel plate for oil and gas conveying pipes. The method specifically comprises the following steps:
1. the components are as follows: less than or equal to 0.12 percent of C, less than or equal to 0.4 percent of Si, less than or equal to 1.65 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.01 percent of S, and the sum of Nb, V and Ti is not more than 0.15 percent; the welding crack sensitivity index Pcm is less than or equal to 0.23 percent.
2. The steel plate is delivered in a TMCP state, the thickness is 10mm to 20mm, and the mechanical property requirements of L450M (or X65M) are as follows: rt0.5 is more than or equal to 450MPa and less than or equal to 600MPa, Rm is more than or equal to 535MPa and less than or equal to 755MPa, the yield ratio is less than or equal to 0.92, A% is more than or equal to 18%, the transverse impact energy KV2 is more than or equal to 120J at the temperature of minus 20 ℃, the average value of the transverse drop hammer shear area is more than or equal to 85% at the temperature of minus 10 ℃, and the single value is more than or equal to 70%.
At present, target components are commonly used in the traditional production process: 0.07% for C, 0.2% for Si, 1.6% for Mn, no more than 0.020% for P, no more than 0.005% for S, 0.035% for Alt, 0.05% for Nb, 0.015% for Ti, 0.15% for Cr, 0.17% for Pcm. Compression ratio: greater than or equal to 10 times. The steel rolling process comprises the following steps: the heating temperature is 1160 ℃, the time is 1min/mm, the temperature is controlled by 3.0 to 3.5 times, and the finishing temperature is 800 ℃. The water cooling process after rolling adopts the traditional ACC laminar cooling, the starting cooling temperature is 750-780 ℃, the final cooling temperature is 520 +/-20 ℃, and the cooling speed is 15-30 ℃/s.
The applicant finds in the course of the invention that: the conventional ACC laminar cooling process has low water cooling pressure and low cooling speed, the opening cooling temperature deviation of the head and the tail of the steel plate is large, the head and tail shielding function cannot be accurately executed in the water cooling process, so that the difference between the tensile strength of the steel plate in the length direction and the plate is large, and the difference between the tensile strength and the plate is about 60-120MPa generally; the same plate difference of the strength is large, the production difficulty of the pipe manufacturing process is increased, the integral stress of the pipeline after the pipe is welded is increased, and the engineering quality and the engineering safety are not facilitated.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
according to an exemplary embodiment of the present invention, there is provided a method of producing a narrow strength grade-to-grade pipeline steel, the method including:
s1, carrying out temperature control and rolling control on a steel billet to obtain a steel plate;
the temperature control and rolling process is carried out by conventional method.
S2, pre-straightening the steel plate to obtain a straightened steel plate;
specifically, the parameters of the pre-straightening process are as follows: forward inclination is 2.5mm, straightening force is 220 tons, biting speed is 0.8 m/s, straightening speed is 1.5m/s, and straightening temperature is 730 ℃ -800 ℃.
Straightening the rolled water-cooled front steel plate by using a pre-straightening machine to ensure that the water-cooled front steel plate is straight
S3, carrying out ultra-fast cooling on the straightening steel plate to obtain pipeline steel; the initial cooling temperature of the ultra-fast cooling is 750-780 ℃, the final cooling temperature of the ultra-fast cooling is 450-550 ℃, the cooling speed of the ultra-fast cooling is 40-50 ℃/s, the head of the straightening steel plate is shielded in the ultra-fast cooling process, the shielding coefficient of the shielding is 0.6-0.8, and the shielding length of the shielding is 3000-4000 mm.
The control of the open cooling temperature to 750-780 ℃ can enable the steel plate to obtain ideal mechanical properties, the adverse effect of overlarge temperature is that the grain size is large and the strength and the low impact toughness are reduced, and the adverse effect of undersize is that the yield strength of the precipitated proeutectoid ferrite is reduced before the rapid cooling is started.
The reason for controlling the final cooling temperature to be 450-550 ℃ is to obtain ideal mechanical properties, the adverse effect of excessively large temperature is that the proportion is lower, the strength is lower, and the adverse effect of excessively small temperature is that the proportion of bainite is higher, even martensite appears, and the strength and the hardness are higher.
The reason for controlling the cooling speed to be 40 ℃/s-50 ℃/s is to obtain ideal mechanical properties, the adverse effect of overlarge speed value is that the bainite proportion is high and even martensite appears, the strength and the hardness are higher, and the adverse effect of undersize is that the opening cooling temperature difference in the length direction of the steel plate is increased, and the control of the strength difference with the plate is not facilitated.
Specifically, the operation of the ultra-fast cooling process is as follows: opening the 4-15 groups of headers with ultra-fast cooling and high density, the water pressure is 2Bar (namely the water pressure for cooling the jet flow is 2Bar), and the water quantity on the high-density nozzle is 160m3The water ratio is 1.5 times, the water ratio is the ratio of the water quantity of a lower collecting pipe of the ultra-fast cooling equipment to the water quantity of an upper collecting pipe, the water flow density ratio of the upper collecting pipe and the lower collecting pipe is controlled, the specific control ratio is 1:1.5, and the uniform cooling of the upper surface and the lower surface of steel plates with different thicknesses is realized; the roller speed is 1.55 m/s, the acceleration is 0.003 m/s, the cooling temperature of the steel plate from head to tail is gradually reduced due to different water inlet time, micro-tracking aiming at the position of the steel plate is established by a control system, and the roller way adopts a micro-acceleration operation mode in the cooling process to eliminate the phenomenon of high head and low tail of the temperature; starting the group 1 side spraying and air purging, wherein the side spraying and air purging are used for removing residual water on the upper surface of the steel plate to uniformly cool the steel plate; the head shielding coefficient is 0.7, the shielding length is 3500mm, the tail is not shielded, and the flow of the head and the tail is controlled to achieve uniform cooling of the steel plate through the head and tail shielding process.
The method is particularly suitable for preparing the pipeline steel with the product grade of L450M-L555M (or X60M-X80M), the thickness specification of 10-20mm, the length of a rolling mother plate of 36-38 m and the width of 2500-3500 mm.
The method has the advantages that the traditional ACC laminar cooling process is replaced by optimizing the pre-straightening and ultra-fast cooling process, the strength of the TMCP pipeline steel is controlled to be equal to and different from the same plate by pre-straightening, automatic control of longitudinal cooling uniformity, head-to-tail shielding control, edge shielding control and control of the water flow density ratio of the upper header and the lower header, the product quality and the product percent of pass are improved, and the safety of pipeline engineering is ensured.
The narrow strength in-plane difference line pipe steel and the production method thereof according to the present application will be described in detail with reference to examples, comparative examples and experimental data.
Example 1
The present example uses the proposed method for producing a line steel with a narrow strength and sheet difference of L450M (or X65M) based on an inclined jet cooling process (ultra-fast cooling), and the present example has a billet size of L450M of 300 × 2400 × 3204mm and a rolling thickness of 17.48 × 3380 × 38200 mm. The specific process parameters are as follows:
(1) the steel plate comprises the following chemical components in percentage by weight: c: 0.068, Si: 0.21, Mn: 1.54, P: 0.008, S: 0.001, Cr: 0.15, Nb: 0.045, Ti: 0.014.
(2) cold charging of the blank, the furnace time of 282min and the furnace discharging temperature of 1165 ℃.
(3) The temperature of the blank is controlled to be 61mm, the temperature of the re-rolling is 914 ℃, and the temperature of the final rolling is 845 ℃.
(4) Pre-straightening is used after rolling and before water cooling, the forward inclination is 2.5mm, the straightening force is 220 tons, the biting speed is 0.8 m/s, the straightening speed is 1.5m/s, and the straightening temperature is 730-800 ℃.
(5) After pre-straightening, ultra-fast cooling is carried out, 4-15 groups of ultra-fast cooling high-density collecting pipes are opened, the water pressure is 2Bar, and the water feeding amount of a high-density nozzle is 160m3Per hour, water ratio 1.5 times; the roller speed is 1.55 m/s, and the acceleration is 0.003 m/s; starting the 1 st group of side spraying and air purging; the head shading coefficient is 0.7, the shading length is 3500mm, and the tail is not shaded. The start cooling temperature is 735 ℃, the end cooling temperature is 540 ℃, and the cooling speed is 44 ℃/s.
Comparative example 1
The embodiment is a traditional ACC laminar-cooling medium plate, and the L450M billet size of the embodiment is 300 multiplied by 2400 multiplied by 3204mm, and the rolling thickness size is 17.48 multiplied by 3380 multiplied by 38200 mm. The specific process parameters are as follows:
(1) the steel plate comprises the following chemical components in percentage by weight: c: 0.068, Si: 0.21, Mn: 1.54, P: 0.008, S: 0.001, Cr: 0.15, Nb: 0.045, Ti: 0.014.
(2) cold charging of the blank, the furnace time of 280min and the furnace discharging temperature of 1164 ℃.
(3) The temperature of the blank is controlled to be 61mm, the temperature of the rolling is 918 ℃ and the temperature of the finishing rolling is 849 ℃.
(4) And carrying out ACC laminar cooling after rolling, wherein the start cooling temperature is 745 ℃, the final cooling temperature is 490 ℃, and the cooling speed is 32 ℃/s.
Examples of the experiments
The steel sheets obtained in example 1 and comparative example 1 were subjected to the property test, and the test results are shown in the following table.
From the above table, the yield strength of the pipeline steel produced by the method provided by the embodiment of the invention is controlled to be narrower than the plate difference and the tensile strength is controlled to be narrower than the plate difference, the product quality and the product percent of pass are effectively improved, the safety of pipeline engineering is ensured, and the data comparison between the comparative example and the embodiment shows that the tensile strength of the pipeline steel can be reduced to be within 20-60MPa from 60-120MPa of the traditional ACC water cooling process and the tensile strength of the pipeline steel can be reduced by more than 40% by replacing the traditional ACC laminar cooling process with the pre-straightening and ultra-fast cooling process.
Detailed description of the drawings 2-5:
as shown in fig. 2 and 3, a graph of the final cooling temperature of the steel plate and a cloud map of the final cooling temperature of the steel plate, which are provided in example 1 of the present invention, are obtained from the graphs, the temperature of the steel plate in the length direction is uniform, and the temperature difference is within 30 ℃;
as shown in FIGS. 4 and 5, the graph of the final cooling temperature of the steel sheet and the cloud of the final cooling temperature of the steel sheet, which are provided in comparative example 1 of the present invention, are shown, respectively, and the temperature in the length direction of the steel sheet is not uniform, and the temperature difference is 50-70 ℃.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
(1) the method provided by the embodiment of the invention replaces the traditional ACC laminar cooling process by optimizing the pre-straightening and ultra-fast cooling process, and realizes the control of the same strength, the same narrow strength, the same plate difference and the same plate difference of TMCP pipeline steel by pre-straightening, automatic control of longitudinal cooling uniformity, head and tail shielding control, edge shielding control and control of the water flow density proportion of an upper header and a lower header, thereby improving the product quality and the product percent of pass and ensuring the safety of pipeline engineering;
(2) the pipeline steel provided by the embodiment of the invention takes 17.48mmL450M (or X65M) pipeline steel as an example, the difference between the tensile strength and the plate can be reduced to within 20-60MPa from 60-120MPa of the traditional ACC water cooling process, and the difference between the tensile strength and the plate is reduced by more than 40%.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for producing a narrow strength grade pipe line steel, the method comprising:
carrying out temperature control and rolling control treatment on the steel billet to obtain a steel plate;
pre-straightening the steel plate to obtain a straightened steel plate;
carrying out ultra-fast cooling on the straightening steel plate to obtain pipeline steel; the initial cooling temperature of the ultra-fast cooling is 750-780 ℃, the final cooling temperature of the ultra-fast cooling is 450-550 ℃, the cooling speed of the ultra-fast cooling is 40-50 ℃/s, the head of the straightening steel plate is shielded in the ultra-fast cooling process, the shielding coefficient of the shielding is 0.6-0.8, and the shielding length of the shielding is 3000-4000 mm.
2. The method for producing a narrow strength homodyne pipeline steel according to claim 1, wherein in the pre-straightening, the forward tilting amount is 2.0mm to 3.0mm, the straightening force of the pre-straightening is 200t to 240t, and the straightening temperature of the pre-straightening is 730 ℃ to 800 ℃.
3. The method for producing a narrow strength homodyne pipeline steel according to claim 1, wherein the pre-straightening bite speed is 0.6m/s to 1.0m/s, and the pre-straightening speed is 1.2m/s to 1.8 m/s.
4. The method for producing a narrow strength grade line steel according to claim 1, wherein the number of working ultrafast cooling high density headers in the ultrafast cooling is 4-15, the water pressure of the ultrafast cooling high density headers is 1.8Bar-2.2Bar, and the water amount of the high density nozzles of the ultrafast cooling high density headers is 140m3/h-180m3The water ratio of the ultra-fast cooling high-density header is 1.3 times to 1.7 times.
5. The method for producing the narrow strength homodyne pipeline steel according to claim 1, wherein the roller speed of the ultra-fast cooling is 1.5m/s-1.6m/s, and the acceleration of the ultra-fast cooling is 0.002m/s-0.004 m/s.
6. The method for producing a narrow strength homodyne pipeline steel according to claim 1, wherein in the ultra-fast cooling, at least 1 set of side spraying and air purging is started.
7. The method of producing a narrow strength grade pipe line steel according to claim 1, further comprising: and heating the steel billet, wherein the tapping temperature of the heating is 1160-1170 ℃, and the heating time is 275-295 min.
8. The method for producing the narrow strength homodyne pipeline steel according to claim 1, wherein the temperature-controlled thickness of the blank subjected to the temperature-controlled rolling treatment is 55mm-60 mm.
9. The method for producing the narrow strength steel for pipelines with same or different strength as that of the narrow strength steel for pipelines according to claim 1, wherein the temperature of the controlled temperature and controlled rolling treatment is 900-930 ℃, and the temperature of the controlled temperature and controlled rolling treatment is 830-860 ℃.
10. A pipeline steel with a narrow same-plate difference, which is prepared by the production method of the pipeline steel with the narrow same-plate difference according to any one of claims 1 to 9, wherein the pipeline steel is L450M pipeline steel or X65M pipeline steel, and the tensile strength of the pipeline steel with the same-plate difference is 20MPa-60 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111370037.XA CN114231718B (en) | 2021-11-18 | 2021-11-18 | Pipeline steel with narrow strength and same plate difference and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111370037.XA CN114231718B (en) | 2021-11-18 | 2021-11-18 | Pipeline steel with narrow strength and same plate difference and production method thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN114231718A true CN114231718A (en) | 2022-03-25 |
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| CN102371283A (en) * | 2011-10-14 | 2012-03-14 | 东北大学 | Method for improving ultra-fast cooling uniformity of medium and heavy plate after rolling |
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