CN111057954A - High-strength pipeline rolled plate for large thick wall acidity and manufacturing method thereof - Google Patents
High-strength pipeline rolled plate for large thick wall acidity and manufacturing method thereof Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 10
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 5
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 9
- 229910000859 α-Fe Inorganic materials 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 7
- 238000009749 continuous casting Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000003723 Smelting Methods 0.000 claims description 5
- 230000035945 sensitivity Effects 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 2
- 230000002378 acidificating effect Effects 0.000 claims 3
- 229910000831 Steel Inorganic materials 0.000 description 21
- 239000010959 steel Substances 0.000 description 21
- 239000010955 niobium Substances 0.000 description 10
- 239000011651 chromium Substances 0.000 description 9
- 239000011572 manganese Substances 0.000 description 9
- 238000005728 strengthening Methods 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 239000006104 solid solution Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 229910001563 bainite Inorganic materials 0.000 description 4
- 239000011733 molybdenum Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Classifications
-
- 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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
-
- 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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- 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
- C22C38/06—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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a high-strength pipeline coiled plate for large thick wall acidity and a manufacturing method thereof, wherein the method comprises the following steps: 0.03% -0.09%, Si: 0.05% -0.20%, Mn: 1.70% -1.95%, P: less than or equal to 0.015 percent, S: less than or equal to 0.002%, Ti: 0.01% -0.03%, Al: 0.03% -0.06%, Nb: 0.06% -0.10%, Cr: 0.20% -0.50%, Mo: 0.20% -0.40%, Ni: 0.10% -0.30%, N: less than or equal to 0.005 percent, and the balance of Fe and inevitable elements.
Description
Technical Field
The invention relates to manufacturing of a pipeline steel hot-rolled coil plate for an oil and gas conveying pipeline, in particular to a high-strength pipeline coil plate for a large thick wall (more than or equal to 18mm) in an acid environment and a manufacturing method thereof.
Background
Petroleum is a main energy source for industrial development, and petroleum pipeline transportation has the characteristics of high efficiency, safety, economy and the like. In order to improve the conveying efficiency and reduce the engineering cost, the development trend of pipelines is to have large thick walls, large pipe diameters and high steel grade, and simultaneously the requirement of acidity is considered.
Generally, the larger the wall thickness is, the more difficult the uniformity of the structure in the thickness direction is to control, the difficulty of controlling the low-temperature toughness and the acid resistance of the rolled plate is improved by times, and particularly, the thickness is more than 18mm, so that the difficulty of the production technology of the X80 rolled plate is extremely high.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for manufacturing a pipeline steel hot-rolled coil plate for an oil and gas conveying pipeline, in particular to a high-strength pipeline coil plate for a large thick wall (more than or equal to 18mm) in an acid environment and a manufacturing method thereof, wherein the crack sensitivity rate CSR of an acid-resistant A solution HIC test is less than or equal to 1.5 percent, the crack length rate CLR is less than or equal to 15 percent, the crack thickness rate CTR is less than or equal to 5 percent, the yield strength meets the requirement of more than 570MPa, and the tensile strength is more than 650 MPa.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a big thick wall is high strength pipeline roll board for acidity which characterized in that: the chemical components by weight percentage are as follows: c: 0.03% -0.09%, Si: 0.05% -0.20%, Mn: 1.70% -1.95%, P: less than or equal to 0.015 percent, S: less than or equal to 0.002%, Ti: 0.01% -0.03%, Al: 0.03% -0.06%, Nb: 0.06% -0.10%, Cr: 0.20% -0.50%, Mo: 0.20% -0.40%, Ni: 0.10% -0.30%, N: less than or equal to 0.005 percent, and the balance of Fe and inevitable elements.
The thickness of the large thick wall is more than or equal to 18 mm.
The crack sensitivity rate CSR of the rolling plate in the acid-resistant A solution HIC test is less than or equal to 1.5 percent, the crack length rate CLR is less than or equal to 15 percent, the crack thickness rate CTR is less than or equal to 5 percent, the yield strength meets more than 570MPa, and the tensile strength is more than 650 MPa.
The coiled plate structure is acicular ferrite, the low-temperature toughness is good, and the DWTT at minus 20 ℃ is ensured to be more than 85 percent.
Compared with the prior art, the scheme C, Mn has moderate content, a proper amount of Mo improves the uniformity in the thickness direction, the low-temperature fracture toughness is improved, and Cr and Ni improve the HIC resistance.
C: carbon belongs to solid solution elements, mainly plays a role in solid solution strengthening, is the most effective element for ensuring the strength, can improve the hardenability and improve the yield strength and the tensile strength, and therefore, the carbon content is not suitable to be too low; however, the increase of the carbon content is not good for the low-temperature fracture toughness and weldability of the material, so the carbon content cannot be too high, and the carbon content is preferably controlled to be 0.03-0.09%.
Si: silicon can play a role in solid solution strengthening and can improve the strength, the generation of red iron sheet can be reduced by less than 0.20 percent, but the plasticity and the toughness of the steel are reduced by excessively high content of the silicon, and the optimal range of the silicon is 0.05 to 0.20 percent.
Mn: manganese mainly plays a role in solid solution strengthening, can improve yield strength and tensile strength, can also increase austenite stability, and is also beneficial to low-temperature toughness and hardenability improvement. Manganese also has the function of reducing the transformation temperature, is beneficial to grain refinement, promotes bainite transformation, and improves the strength and the toughness. However, too high manganese content tends to induce segregation and to counter the disadvantage of acidity, and it is preferable to control the Mn content to 1.70% to 1.95%.
P: phosphorus is a harmful element in steel, increases the cold brittleness of the steel, deteriorates the welding performance, reduces the plasticity, deteriorates the cold bending performance, and the content of the phosphorus is controlled to be less than or equal to 0.015 percent.
S: sulfur is a harmful element in steel, causes hot brittleness of the steel, reduces the ductility and toughness of the steel, is also unfavorable for welding performance, and the content of the sulfur is controlled to be less than or equal to 0.002 percent.
Al: aluminum is a common deoxidizer, and a small amount of aluminum is added into steel, so that grains can be refined, the impact toughness is improved, and the proper range is 0.03-0.06%.
Ti: titanium is a strong carbonitride forming element, significantly refines austenite grains, and can compensate for the decrease in strength caused by the decrease in carbon. The content is too high, coarse TiN is easily formed, the material performance is reduced, and the proper range is 0.01-0.03%.
Nb: niobium is a fine crystalline and precipitation strengthening element, improving the welding performance. In the pipeline steel, the strong grain refining effect is mainly caused by delaying or preventing austenite recrystallization in a frame after hot rolling, and Nb reduces the grain growth rate while increasing the ferrite nucleation rate by reducing the austenite-to-ferrite phase transition temperature. Meanwhile, Nb can promote the formation of bainite structure and precipitation strengthening effect. Nb is too high, however, and increases the cost of the alloy, and a suitable range is 0.06% -0.10%.
Cr: chromium has a strong solid solution strengthening effect and can also effectively improve the structural stability. In the aspects of improving the strength and refining grains, Cr is the same as Mo, can inhibit the formation of block ferrite, refine the grains and promote the transformation of bainite, obtain more and fine bainite tissues and ensure the grain size to be more than 10 grades, thereby greatly improving the strength. Meanwhile, Cr is used in combination with Nb, so that the precipitation of Nb can be promoted, and the precipitation strengthening effect of Nb and V can be improved. The strength increases more with increasing Cr content. Meanwhile, a Cr content of 0.20% or more is advantageous in the HIC resistance. However, too large an amount of addition significantly reduces the toughness and weldability of the weld heat-affected zone. Therefore, a suitable range of Cr of the present invention is 0.20% to 0.50%.
Mo: molybdenum is capable of improving hardenability mainly by means of carbides and solid solution strengthening, improving the uniformity of the structure in the thickness direction, and thus improving the strength of steel. Molybdenum can inhibit ferrite production and promote acicular ferrite generation. Molybdenum is also advantageous against corrosion, in particular against the effects of hydrogen attack. Molybdenum also has the effect of improving the uniformity of the whole roll performance of the plate roll. The optimal range is 0.20% -0.40%.
Ni: nickel can increase hardenability, enlarge austenite area, refine crystal grains and improve low-temperature toughness and fatigue resistance of steel. The corrosion resistance of the steel is improved. Too high a content tends to increase the brittleness and the overheating sensitivity of the steel. The optimal range is 0.10% -0.30%.
N: the dissolved nitrogen has strong function of pinning dislocation and has adverse effect on toughness, and the content of the dissolved nitrogen is controlled to be less than or equal to 0.005 percent.
A manufacturing method of a high-strength pipeline coiled plate for large thick wall acidity comprises smelting, casting, rolling, cooling and coiling; the method is characterized in that: heating the continuous casting plate blank to 1150-1180 ℃ by a heating furnace, and performing two-stage controlled rolling, wherein the finish rolling temperature of the first stage is more than 970 ℃; the second stage has the initial rolling temperature of less than 980 ℃ and the final rolling temperature of 780-820 ℃; cooling the rolled coil at the cooling speed of 15-25 ℃/s, and coiling the coil at the temperature of 320-420 ℃. Fine and uniform acicular ferrite structure is obtained. The compression ratio of the second stage is 60-65%, the deformation of the steel plate in the finish rolling stage can be fully expanded to the core part in the thickness direction, the tissue difference in the thickness direction is reduced, and the low-temperature fracture toughness and the HIC resistance are ensured.
Smelting and continuous casting process: the method comprises the steps of molten iron pretreatment, converter smelting, top blowing or top-bottom combined blowing, external refining, light desulfurization treatment in an LF furnace and calcium treatment to control the shape of impurities and improve the ductility, toughness and cold bending performance of steel, and medium-thin continuous casting slabs prepared by continuous casting of molten steel are subjected to electromagnetic stirring or dynamic light pressing to improve the quality of the continuous casting slabs.
The invention has the beneficial effects that:
1) the steel plate has moderate C, Mn content and high strength;
2) proper amount of Mo improves the uniformity in the thickness direction and improves the low-temperature fracture toughness;
3) cr and Ni improve the HIC resistance;
4) the final structure is acicular ferrite, the low-temperature toughness is good, and the DWTT at-20 ℃ is ensured to be more than 85 percent.
Detailed Description
The following description is given with reference to specific examples:
the chemical components of the examples 1-6 are shown in table 1, the heating, rolling and cooling process parameters are shown in table 2, and the mechanical property detection results are shown in table 3.
Table 1 examples chemical composition wt%
| Examples | C | Si | Mn | P | S | Nb | Mo | Ti | Cr | Ni | Al | N |
| 1 | 0.05 | 0.06 | 1.78 | 0.012 | 0.002 | 0.07 | 0.22 | 0.017 | 0.30 | 0.15 | 0.03 | 0.0042 |
| 2 | 0.04 | 0.15 | 1.80 | 0.009 | 0.001 | 0.07 | 0.24 | 0.020 | 0.27 | 0.18 | 0.04 | 0.0045 |
| 3 | 0.08 | 0.20 | 1.71 | 0.012 | 0.002 | 0.06 | 0.30 | 0.026 | 0.35 | 0.20 | 0.03 | 0.0050 |
| 4 | 0.06 | 0.10 | 1.90 | 0.013 | 0.001 | 0.06 | 0.21 | 0.015 | 0.45 | 0.30 | 0.03 | 0.0038 |
| 5 | 0.07 | 0.17 | 1.75 | 0.012 | 0.001 | 0.09 | 0.35 | 0.012 | 0.25 | 0.28 | 0.04 | 0.0042 |
| 6 | 0.06 | 0.13 | 1.84 | 0.011 | 0.002 | 0.08 | 0.27 | 0.016 | 0.29 | 0.24 | 0.03 | 0.0039 |
TABLE 2 examples heating, rolling, cooling process parameters
TABLE 3 mechanical Properties of the examples
As can be seen from Table 3, the high-strength pipeline coiled plate for the large thick wall (not less than 18mm) in the acid environment is produced by adopting the components, smelting, continuous casting, heating, rolling, cooling and coiling processes, the mechanical property of the high-strength pipeline coiled plate meets the requirement of API SPEC 5L standard on an X80-grade steel pipe, and the high-strength pipeline coiled plate can be used for manufacturing an X80-grade A solution HIC-resistant steel pipe meeting the requirement of the API SPEC 5L standard.
Claims (5)
1. The utility model provides a big thick wall is high strength pipeline roll board for acidity which characterized in that: the chemical components by weight percentage are as follows: c: 0.03% -0.09%, Si: 0.05% -0.20%, Mn: 1.70% -1.95%, P: less than or equal to 0.015 percent, S: less than or equal to 0.002%, Ti: 0.01% -0.03%, Al: 0.03% -0.06%, Nb: 0.06% -0.10%, Cr: 0.20% -0.50%, Mo: 0.20% -0.40%, Ni: 0.10% -0.30%, N: less than or equal to 0.005 percent, and the balance of Fe and inevitable elements.
2. The heavy-duty thick acidic high strength rolled pipe sheet according to claim 1, wherein: the thickness of the large thick wall is more than or equal to 18 mm.
3. The heavy-duty thick acidic high strength rolled pipe sheet according to claim 1, wherein: the crack sensitivity rate CSR of the rolling plate in the acid-resistant A solution HIC test is less than or equal to 1.5 percent, the crack length rate CLR is less than or equal to 15 percent, the crack thickness rate CTR is less than or equal to 5 percent, the yield strength meets more than 570MPa, and the tensile strength is more than 650 MPa.
4. The heavy-duty thick acidic high strength rolled pipe sheet according to claim 1, wherein: the rolled plate structure is acicular ferrite, and the DWTT at-20 ℃ is ensured to be more than 85 percent.
5. A method for manufacturing the high-strength rolled pipe plate for the large thick wall acidity according to any one of claims 1 to 4, comprising smelting, casting, rolling, cooling and coiling; the method is characterized in that: heating the continuous casting plate blank to 1150-1180 ℃ by a heating furnace, and performing two-stage controlled rolling, wherein the finish rolling temperature of the first stage is more than 970 ℃; the second stage has the initial rolling temperature of less than 980 ℃ and the final rolling temperature of 780-820 ℃; cooling the rolled coil at the cooling speed of 15-25 ℃/s, and coiling the coil at the temperature of 320-420 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010001207.6A CN111057954A (en) | 2020-01-02 | 2020-01-02 | High-strength pipeline rolled plate for large thick wall acidity and manufacturing method thereof |
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| CN202010001207.6A CN111057954A (en) | 2020-01-02 | 2020-01-02 | High-strength pipeline rolled plate for large thick wall acidity and manufacturing method thereof |
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Citations (23)
| Publication number | Priority date | Publication date | Assignee | Title |
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