CN110408841B - Hot-rolled steel strip for Nb + Ti + Mo component system X56M pipeline steel and preparation method thereof - Google Patents
Hot-rolled steel strip for Nb + Ti + Mo component system X56M pipeline steel and preparation method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 72
- 239000010959 steel Substances 0.000 title claims abstract description 72
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims description 48
- 238000001816 cooling Methods 0.000 claims description 13
- 239000011575 calcium Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 9
- 229910052791 calcium Inorganic materials 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- 238000010079 rubber tapping Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 6
- 238000005098 hot rolling Methods 0.000 claims description 6
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 4
- 229910001309 Ferromolybdenum Inorganic materials 0.000 claims description 3
- 229910000592 Ferroniobium Inorganic materials 0.000 claims description 3
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 3
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 238000009749 continuous casting Methods 0.000 claims description 3
- 238000006477 desulfuration reaction Methods 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 claims description 3
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000005275 alloying Methods 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910001563 bainite Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- 229910001257 Nb alloy Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- 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
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
-
- 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
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a hot rolled steel strip for Nb + Ti + Mo component system X56M pipeline steel and a preparation method thereof, wherein the hot rolled steel strip for X56M pipeline steel comprises the following components in percentage by mass: 0.06-0.08% of C; 0.10-0.20% of Si; 1.30-1.40% of Mn1; p is less than or equal to 0.018 percent; nb is 0.030-0.035%; 0.025-0.035% of Ti; 0.009-0.12% of Mo; s is less than or equal to 0.005 percent; alt 0.025-0.050%; 0.0010-0.0030% of Ca; n is less than or equal to 0.012 percent; the balance being Fe and unavoidable impurities. The hot rolled steel strip for the Nb + Ti + Mo component system X56M pipeline steel prepared by the invention has good comprehensive mechanical property, is suitable for local engineering reconstruction projects and oil field engineering application projects, and has low cost, long service life and excellent performance.
Description
Technical Field
The invention belongs to the technical field of conveying pipe equipment, and particularly relates to a hot-rolled steel strip for Nb + Ti + Mo component system X56M pipeline steel and a preparation method thereof.
Background
In order to ensure the comprehensive performance of the product and improve the comprehensive competitiveness of the product, the development of a hot rolled steel strip product for X56M pipeline steel is urgently needed to meet the production and use requirements of pipe mills all over the world.
Disclosure of Invention
In view of one or more of the problems of the prior art, an aspect of the present invention provides a hot rolled steel strip for Nb + Ti + Mo composition system X56M pipeline steel, comprising the following components in percentage by mass: 0.06-0.08% of C; 0.10-0.20% of Si; 1.30-1.40% of Mn; p is less than or equal to 0.018 percent; nb is 0.030-0.035%; 0.025-0.035% of Ti; mo0.009-0.12%; s is less than or equal to 0.005 percent; alt 0.025-0.050%; 0.0010-0.0030% of Ca; n is less than or equal to 0.012 percent; the balance being Fe and unavoidable impurities.
The mechanical property of the hot rolled steel strip meets the requirements that the yield strength is more than or equal to 476MPa, the tensile strength is more than or equal to 622MPa, the elongation A is more than or equal to 46.7 percent, the impact energy at minus 20 ℃ is more than or equal to 216J, and the yield ratio is less than or equal to 0.77.
In another aspect, the present invention provides a method for manufacturing the hot rolled steel strip, comprising the steps of:
1) smelting in a converter: wherein the tapping temperature is more than or equal to 1620 ℃, and ferro-aluminium, ferromanganese and ferrosilicon are added in the tapping process of the converter for deoxidation alloying;
2) l F furnace refining, which is to control the processes of slagging, deoxidation, desulfurization and inclusion removal in a L F furnace, add aluminum iron, silicon iron, ferromanganese, ferrotitanium, ferroniobium and ferromolybdenum alloy according to the components of molten steel to adjust the components to a target component range, feed a calcium wire for calcium treatment, and ensure that the softening time is more than or equal to 8min after the calcium treatment is finished;
3) continuous casting: wherein the superheat degree of the molten steel in the tundish of the first ladle is 25-40 ℃, and the superheat degree of the molten steel in other heats is 15-30 ℃; the casting machine adopts a constant drawing speed, and the drawing speed is 1.0-1.3 m/min;
4) hot rolling: wherein the hot rolling comprises rough rolling and finish rolling, and the rough rolling adopts a 1+5 or 3+3 mode; the rough rolling heating temperature is 930-1030 ℃; the furnace time is 180-300 min; the soaking temperature is 1180-1210 ℃;
the initial rolling temperature of finish rolling is 930-1100 ℃; the finishing temperature is 845-875 ℃;
5) and (3) laminar cooling and coiling: and after cooling, encrypted laminar flow cooling is adopted, the cooling speed of the steel strip is controlled to be 28-32 ℃, and the steel strip is uniformly cooled, wherein the coiling temperature is 500-540 ℃.
The finish rolling is carried out by adopting a 2250mm finish rolling machine.
The rough rolling is 1 pass rolling by using a 1# rough rolling mill, 5 passes rolling by using a 2# rough rolling mill or 3 passes rolling by using a 1# rough rolling mill and 3 passes rolling by using a 2# rough rolling mill.
The hot rolled steel strip for the Nb + Ti + Mo component system X56M pipeline steel and the preparation method thereof, which are provided based on the technical scheme, have the advantages that through reasonable component design, especially the alloy component content design of Nb, Ti and Mo, and through controlled rolling and controlled cooling processes, the hot rolled steel strip for the Nb + Ti + Mo component system X56M pipeline steel with good comprehensive mechanical properties is obtained, and the metallographic structure of the microstructure is ferrite, bainite and pearlite; the mechanical property of the product meets the requirements that the yield strength is more than or equal to 476MPa, the tensile strength is more than or equal to 622MPa, the elongation A is more than or equal to 46.7 percent, the impact energy at minus 20 ℃ is more than or equal to 216J, and the yield ratio is less than or equal to 0.77. The preparation method of the hot rolled steel strip for the Nb + Ti + Mo component system X56M pipeline steel is simple, easy to operate, suitable for industrial production and suitable for mass production of the current 2250mm advanced production line and CSP rolling line.
Drawings
FIG. 1 is a metallographic structure diagram of a hot-rolled steel strip for X56M line steel prepared in example 1 of the present invention.
Detailed Description
In one embodiment, the invention provides a hot-rolled steel strip for Nb + Ti + Mo composition system X56M line steel, comprising the following components in percentage by mass: 0.06-0.08% of C; 0.10-0.20% of Si; 1.30-1.40% of Mn; p is less than or equal to 0.018 percent; nb is 0.030-0.035%; 0.025-0.035% of Ti; 0.009-0.12% of Mo; s is less than or equal to 0.005 percent; alt0.025-0.050%; 0.0010-0.0030% of Ca; n is less than or equal to 0.012 percent; the balance being Fe and unavoidable impurities.
In another embodiment, the present invention provides a method for producing a hot-rolled steel strip for Nb + Ti + Mo composition system X56M line steel, comprising the steps of:
1) converter smelting (240t converter smelting): wherein the tapping temperature is more than or equal to 1620 ℃, and the coordination of the components and the temperature is ensured for tapping; if a new steel tapping hole or an abnormal turnover ladle is used, the tapping temperature is properly increased by 10-15 ℃ on the basis of the upper limit. Adding ferro-aluminum, ferromanganese and ferrosilicon to deoxidize and alloy in the converter tapping process;
2) l F furnace refining, which is to control the processes of slagging, deoxidation, desulfurization and inclusion removal in a L F furnace, add aluminum iron, silicon iron, ferromanganese, ferrotitanium, ferroniobium and ferromolybdenum alloy according to the components of molten steel to adjust the components to a target component range, feed a calcium wire for calcium treatment, and ensure that the softening time is more than or equal to 8min after the calcium treatment is finished;
3) continuous casting: wherein the superheat degree of the molten steel in the tundish of the first ladle is 25-40 ℃, and the superheat degree of the molten steel in other heats is 15-30 ℃; the casting machine adopts a constant drawing speed, and the drawing speed is 1.0-1.3 m/min;
4) hot rolling: the hot rolling comprises rough rolling and finish rolling, wherein the rough rolling adopts a 1+5 or 3+3 mode, for example, the rough rolling adopts a 1# rough rolling mill to roll for 1 pass, a 2# rough rolling mill to roll for 5 passes or the rough rolling adopts a 1# rough rolling mill to roll for 3 passes, and a 2# rough rolling mill to roll for 3 passes; the rough rolling heating temperature is 930-1030 ℃; the furnace time is 180-300 min; the soaking temperature is 1180-1210 ℃;
the initial rolling temperature of finish rolling is 930-1100 ℃; the finishing temperature is 845-875 ℃, and the finish rolling is rolling by adopting a 2250mm finishing mill;
5) and (3) laminar cooling and coiling: and after cooling, encrypted laminar flow cooling is adopted, the cooling speed of the steel strip is controlled to be 28-32 ℃, and the steel strip is uniformly cooled, wherein the coiling temperature is 500-540 ℃.
According to the preparation method, the hot rolled steel strip with the thickness of 15.0-20.0 mm can be prepared.
Other process parameters of the above-mentioned hot rolled steel strip for Nb + Ti + Mo composition system X56M pipeline steel can be referred to the prior art.
The present invention will be described in detail with reference to the following specific embodiments.
The embodiments are implemented on the premise of the technical scheme of the invention, and give detailed implementation modes and specific operation processes, and the embodiments will help understanding the invention, but should not be taken as limiting the invention.
Example (b):
the actual slab chemical compositions (mass percentages) of examples 1-3 and comparative examples 1-2 are shown in table 1 below, according to the above steelmaking process requirements.
Table 1 chemical composition wt.% of examples 1-3 and comparative examples 1-2%
| Examples | C | Si | Mn | P | Nb | Ti | Mo | S | Alt | Ca | N |
| 1 | 0.06 | 0.15 | 1.30 | 0.018 | 0.030 | 0.035 | 0.009 | 0.005 | 0.025 | 0.001 | 0.012 |
| 2 | 0.07 | 0.20 | 1.35 | 0.017 | 0.035 | 0.025 | 0.05 | 0.005 | 0.050 | 0.002 | 0.011 |
| 3 | 0.08 | 0.10 | 1.40 | 0.017 | 0.035 | 0.030 | 0.12 | 0.005 | 0.030 | 0.003 | 0.012 |
| Comparative example 1 | 0.07 | 0.15 | 1.35 | 0.017 | 0.020 | 0.015 | 0.03 | 0.005 | 0.025 | 0.003 | 0.011 |
| Comparative example 2 | 0.08 | 0.10 | 1.40 | 0.018 | 0.050 | 0.010 | 0.050 | 0.005 | 0.030 | 0.002 | 0.012 |
The following table 2 shows the preparation process conditions of examples 1 to 3 and comparative examples 1 to 2.
TABLE 2 preparation Process conditions for examples 1-3 and comparative examples 1-2
The hot rolled steel strip for X56M line steel was prepared according to the chemical composition design of table 1 above and the preparation process conditions of table 2 above, wherein the metallographic structure of the hot rolled steel strip for X56M line steel obtained in example 1 is ferrite + bainite + pearlite as shown in fig. 1. The thickness of the prepared hot rolled steel strip for the X56M pipeline steel is 15-20mm, the mechanical property is shown in the following table 3, and the test method refers to GB/T228.1 and GB/T229.
TABLE 3 mechanical Properties of Hot-rolled Steel strips prepared in examples 1 to 3 and comparative examples 1 to 2
As can be seen from the data in the above tables 1-3, the present invention obtains a hot rolled steel strip for X56M line steel with excellent mechanical properties by controlling rolling and cold rolling through reasonable blending ratio of Nb, Ti and Mo alloy components, especially the blending ratio of Nb and Ti. Compared with comparative examples 1 and 2, the main component change of the examples 1 to 3 of the invention is the change of the Nb content and the Ti content, and the results show that the Nb content and the Ti content of the examples 1 to 3 of the invention are respectively controlled to be 0.030 to 0.035 wt.% and 0.025 to 0.035 wt.%, the reasonable Mo content is matched, the yield strength of the hot rolled steel strip for X56M pipeline steel obtained by controlling rolling and controlling cold rolling is more than or equal to 476MPa, the tensile strength is more than or equal to 622MPa, the elongation is more than or equal to 46.7, the yield ratio is less than or equal to 0.77, and the impact energy at-20 ℃ is more than or equal to 216J. Although the yield strength, tensile strength and impact energy at-20 ℃ of the hot rolled steel strip for X56M line steel obtained in comparative example 2 were superior to those of examples 1 to 3 of the present invention, the elongation (39.0) and yield ratio (0.84) of comparative example 2 were inferior to those of examples 1 to 3 of the present invention, and the impact properties thereof could not satisfy the production requirements. Comparative example 1, although also having good impact properties (elongation 46.1, yield ratio 0.78), had a yield strength of 436MPa, a tensile strength of 559MPa, and an impact energy of 178J at-20 ℃, and was weak in comprehensive mechanical properties.
In conclusion, the hot rolled steel strip for the Nb + Ti + Mo component system X56M pipeline steel provided by the invention has good comprehensive mechanical properties, stable product quality, excellent tensile property and impact property, low cost, long service life and excellent performance, and is suitable for local engineering reconstruction projects and oil field engineering application projects. The preparation method of the hot rolled steel strip for the Nb + Ti + Mo component system X56M pipeline steel is simple, easy to operate, suitable for industrial production and suitable for mass production of the current 2250mm advanced production line and CSP rolling line.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A hot-rolled steel strip for Nb + Ti + Mo composition system X56M pipeline steel is characterized by comprising the following components in percentage by mass: 0.06-0.08% of C; 0.10-0.20% of Si; 1.30-1.40% of Mn; p is less than or equal to 0.018 percent; nb is 0.030-0.035%; 0.025-0.035% of Ti; 0.009-0.12% of Mo; s is less than or equal to 0.005 percent; alt 0.025-0.050%; 0.0010-0.0030% of Ca0; n is less than or equal to 0.012 percent; the balance of Fe and inevitable impurities;
the mechanical property of the hot-rolled steel strip meets the requirements that the yield strength is more than or equal to 476MPa, the tensile strength is more than or equal to 622MPa, the elongation A is more than or equal to 46.7 percent, the impact energy at minus 20 ℃ is more than or equal to 216J, and the yield ratio is less than or equal to 0.77;
the preparation method of the hot rolled steel strip comprises the following steps:
1) smelting in a converter: wherein the tapping temperature is more than or equal to 1620 ℃, and ferro-aluminium, ferromanganese and ferrosilicon are added in the tapping process of the converter for deoxidation alloying;
2) l F furnace refining, which is to control the processes of slagging, deoxidation, desulfurization and inclusion removal in a L F furnace, add aluminum iron, silicon iron, ferromanganese, ferrotitanium, ferroniobium and ferromolybdenum alloy according to the components of molten steel to adjust the components to a target component range, feed a calcium wire for calcium treatment, and ensure that the softening time is more than or equal to 8min after the calcium treatment is finished;
3) continuous casting: wherein the superheat degree of the molten steel in the tundish of the first ladle is 25-40 ℃, and the superheat degree of the molten steel in other heats is 15-30 ℃; the casting machine adopts a constant drawing speed, and the drawing speed is 1.0-1.3 m/min;
4) hot rolling: wherein the hot rolling comprises rough rolling and finish rolling, and the rough rolling adopts a 1+5 or 3+3 mode; the rough rolling heating temperature is 930-1030 ℃; the furnace time is 180-300 min; the soaking temperature is 1180-1210 ℃;
the initial rolling temperature of finish rolling is 930-1100 ℃; the finishing temperature is 845-875 ℃;
5) and (3) laminar cooling and coiling: and after cooling, encrypted laminar flow cooling is adopted, the cooling speed of the steel strip is controlled to be 28-32 ℃/s, the steel strip is uniformly cooled, and the coiling temperature is 500-540 ℃.
2. The hot rolled steel strip as claimed in claim 1 wherein the finish rolling is rolling with a 2250mm finishing mill.
3. The hot rolled steel strip as claimed in claim 1 wherein the roughing is 1 pass rolling with a # 1 roughing mill, 5 passes rolling with a # 2 roughing mill or 3 passes rolling with a # 1 roughing mill and 3 passes rolling with a # 2 roughing mill.
Priority Applications (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2018127646A (en) * | 2017-02-06 | 2018-08-16 | Ｊｆｅスチール株式会社 | High strength hot rolled steel sheet and method for producing the same |
| CN109402510A (en) * | 2018-11-19 | 2019-03-01 | 包头钢铁（集团）有限责任公司 | A kind of resistance to anti-H that extremely trembles with fear2S corrodes welded tube hot rolled strip and its manufacturing method |
| CN109457179A (en) * | 2018-11-19 | 2019-03-12 | 包头钢铁（集团）有限责任公司 | A kind of hydrogen sulfide corrosion resistant welded tube hot rolled strip and its manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018127646A (en) * | 2017-02-06 | 2018-08-16 | Ｊｆｅスチール株式会社 | High strength hot rolled steel sheet and method for producing the same |
| CN109402510A (en) * | 2018-11-19 | 2019-03-01 | 包头钢铁（集团）有限责任公司 | A kind of resistance to anti-H that extremely trembles with fear2S corrodes welded tube hot rolled strip and its manufacturing method |
| CN109457179A (en) * | 2018-11-19 | 2019-03-12 | 包头钢铁（集团）有限责任公司 | A kind of hydrogen sulfide corrosion resistant welded tube hot rolled strip and its manufacturing method |
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