CN113373384A - Steel for petroleum casing coupling material and preparation method thereof - Google Patents
Steel for petroleum casing coupling material and preparation method thereof Download PDFInfo
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- CN113373384A CN113373384A CN202110673866.9A CN202110673866A CN113373384A CN 113373384 A CN113373384 A CN 113373384A CN 202110673866 A CN202110673866 A CN 202110673866A CN 113373384 A CN113373384 A CN 113373384A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 95
- 239000010959 steel Substances 0.000 title claims abstract description 95
- 239000000463 material Substances 0.000 title claims abstract description 39
- 230000008878 coupling Effects 0.000 title claims abstract description 11
- 238000010168 coupling process Methods 0.000 title claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 11
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000003208 petroleum Substances 0.000 title abstract description 14
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 45
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 39
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 18
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 13
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 229910052745 lead Inorganic materials 0.000 claims abstract description 5
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 229910052787 antimony Inorganic materials 0.000 claims abstract description 3
- 229910052785 arsenic Inorganic materials 0.000 claims abstract description 3
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 3
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 3
- 229910052718 tin Inorganic materials 0.000 claims abstract description 3
- 238000009749 continuous casting Methods 0.000 claims description 71
- 238000009628 steelmaking Methods 0.000 claims description 43
- 238000006477 desulfuration reaction Methods 0.000 claims description 41
- 230000023556 desulfurization Effects 0.000 claims description 41
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 37
- 238000003756 stirring Methods 0.000 claims description 36
- 238000005266 casting Methods 0.000 claims description 29
- 238000007670 refining Methods 0.000 claims description 29
- 238000001816 cooling Methods 0.000 claims description 23
- 239000003921 oil Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 238000000605 extraction Methods 0.000 claims description 21
- 238000010583 slow cooling Methods 0.000 claims description 19
- 238000007711 solidification Methods 0.000 claims description 18
- 230000008023 solidification Effects 0.000 claims description 18
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 16
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 8
- 229910001199 N alloy Inorganic materials 0.000 claims description 8
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 8
- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 claims description 8
- 239000011575 calcium Substances 0.000 claims description 8
- 229910052791 calcium Inorganic materials 0.000 claims description 8
- 239000004571 lime Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 7
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 7
- 229910000676 Si alloy Inorganic materials 0.000 claims description 7
- 238000005275 alloying Methods 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 7
- 239000003153 chemical reaction reagent Substances 0.000 claims description 7
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 7
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 230000002441 reversible effect Effects 0.000 claims description 7
- 238000010079 rubber tapping Methods 0.000 claims description 7
- 239000002893 slag Substances 0.000 claims description 7
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 claims description 6
- 238000002425 crystallisation Methods 0.000 claims description 6
- 230000008025 crystallization Effects 0.000 claims description 6
- 239000004411 aluminium Substances 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 8
- 238000005496 tempering Methods 0.000 abstract description 7
- 238000003723 Smelting Methods 0.000 abstract description 5
- 229910000905 alloy phase Inorganic materials 0.000 abstract description 4
- 239000011651 chromium Substances 0.000 description 7
- 239000011572 manganese Substances 0.000 description 7
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000007792 addition Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- 239000010955 niobium Substances 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 2
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- QDLZHJXUBZCCAD-UHFFFAOYSA-N [Cr].[Mn] Chemical compound [Cr].[Mn] QDLZHJXUBZCCAD-UHFFFAOYSA-N 0.000 description 1
- ARZRWOQKELGYTN-UHFFFAOYSA-N [V].[Mn] Chemical compound [V].[Mn] ARZRWOQKELGYTN-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- RGKMZNDDOBAZGW-UHFFFAOYSA-N aluminum calcium Chemical compound [Al].[Ca] RGKMZNDDOBAZGW-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000008855 peristalsis Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- -1 vanadium-nitrogen-carbon nitrogen Chemical compound 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/02—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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a steel for a petroleum casing coupling material and a preparation method thereof, wherein the steel comprises the following components in percentage by mass: 0.25 to 0.28 percent of C, 0.17 to 0.3 percent of Si, 1.25 to 1.35 percent of Mn, 0.1 to 0.12 percent of V, 0.006 to 0.01 percent of N, 0.025 to 0.04 percent of Al, less than or equal to 0.015 percent of P, less than or equal to 0.004 percent of S, less than or equal to 0.002 percent of O, less than or equal to 0.1 percent of Cr, less than or equal to 0.05 percent of Mo, less than or equal to 0.2 percent of Ni, less than or equal to 0.2 percent of Cu, less than or equal to 0.005 percent of Pb, Sn, As, Sb and Bi, and the balance of Fe and other inevitable impurities. The adjustment of the components introduces vanadium and nitrogen in the smelting process to form a micro-alloy phase so as to improve the stability of the performance of the steel pipe, and the steel pipe can reach the yield strength of 379-552MPa, the tensile strength of more than or equal to 655MPa and the longitudinal impact energy of more than or equal to 27J without tempering.
Description
Technical Field
The invention relates to the field of steel making, in particular to a steel for a petroleum casing coupling material and a preparation method thereof.
Background
The petroleum casing pipe is mainly used for supporting a well wall in a drilling process and after well completion, the connecting hoop material is a connecting piece of the oil pipe and the casing pipe, the service environment is severe, the connecting hoop material and the oil pipe bear pulling force generated by a pipe column, breaking force generated by stratum peristalsis and the like, and the requirements on the strength and the impact toughness of the steel pipe are high.
For example, CN105002425A discloses an ultrahigh-strength and ultrahigh-toughness steel for petroleum casing pipes, the microstructure of which is tempered sorbite, and the steel comprises the following chemical elements in percentage by mass: c: 0.1-0.22%, Si: 0.1-0.4%, Mn: 0.5-1.5%, Cr: 1-1.5%, Mo: 1-1.5%, Nb: 0.01-0.04%, V: 0.2-0.3%, Al: 0.01-0.05%, Ca: 0.0005-0.005%, and the balance of Fe and inevitable impurities. The strength of the steel for the ultrahigh-strength and ultrahigh-toughness oil casing pipe and the strength of the oil casing pipe can reach more than 155ksi, and the impact toughness is greater than 10% of the yield strength numerical value of the steel, so that the ultrahigh-strength and ultrahigh-toughness matching can be realized.
CN102517511A discloses a high expansion rate petroleum casing steel and a method for manufacturing petroleum casing pipes by using the same, relating to iron-based alloy, wherein the steel comprises the following raw materials by mass percent: c: 0.03 to 0.25%, Si: 0.3-2.5%, Mn: 0.5-4.0%, Cr: 0-0.5%, S is less than or equal to 0.02%, P is less than or equal to 0.02%, and Fe: and the balance, one, two or three of Nb, Ti and V can be added, and the addition amount is as follows by mass percent: nb: 0.01 to 0.12%, Ti: 0.01-0.06%, V: 0.01-0.12%, smelting and making into a steel pipe blank or a steel plate; the seamless petroleum casing pipe with high expansion rate is made of steel pipe blank by adopting seamless pipe forming technology and the seamed petroleum casing pipe with high expansion rate is made of steel plate by adopting straight seam resistance welding. The expansion rate of the manufactured petroleum casing is more than or equal to 30 percent, and the defects of low expansion rate and high cost of the existing oil-gas well expandable casing are overcome.
However, at present, general steel pipes (such as manganese steel, manganese vanadium steel and manganese chromium steel) made of K55 steel grade have the condition of insufficient strength or unqualified impact property after normalizing treatment, and a steel pipe factory usually adopts a quenching and tempering heat treatment mode to meet the performance requirement, but increases the manufacturing cost of finished steel pipes, thereby causing energy waste and obvious environmental protection problems; if additional components such as molybdenum and niobium are added to the steel to improve the strength, the production cost is high.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a steel for a petroleum casing coupling material and a preparation method thereof, vanadium and nitrogen are introduced in the smelting process through adjusting components to form a micro-alloy phase so as to improve the stability of the performance of a steel pipe, meanwhile, the yield strength of 379-.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a steel material for an oil casing coupling material, wherein the steel material comprises, by mass:
0.25 to 0.28 percent of C, 0.17 to 0.3 percent of Si, 1.25 to 1.35 percent of Mn, 0.1 to 0.12 percent of V, 0.006 to 0.01 percent of N, 0.025 to 0.04 percent of Al, less than or equal to 0.015 percent of P, less than or equal to 0.004 percent of S, less than or equal to 0.002 percent of O, less than or equal to 0.1 percent of Cr, less than or equal to 0.05 percent of Mo, less than or equal to 0.2 percent of Ni, less than or equal to 0.2 percent of Cu, less than or equal to 0.005 percent of Pb, Sn, As, Sb and Bi, and the balance of Fe and other inevitable impurities.
According to the steel provided by the invention, through designing the components of the steel, vanadium-nitrogen alloy elements are introduced, so that vanadium-nitrogen-carbon nitrogen compound compounds are formed in the steel, through precipitation strengthening and grain refining, the steel is further ensured not to be quenched and tempered, and the normalized mechanical properties of the hot-rolled steel pipe meet the requirements of the same quenched and tempered state.
In the present invention, the content of C in the steel material for an oil country tubular good is 0.25 to 0.28% by mass, and may be, for example, 0.25%, 0.26%, 0.27%, or 0.28%, but is not limited to the above-mentioned values, and other combinations not shown in the above-mentioned range are also applicable.
In the present invention, the Si content in the steel material for an oil country tubular good may be, for example, 0.17 to 0.3% by mass, for example, 0.17%, 0.18%, 0.19%, 0.2%, 0.22%, 0.24%, 0.26%, 0.28%, or 0.3%, but is not limited to the above-mentioned values, and other combinations not shown in the above-mentioned range are also applicable.
In the present invention, Mn in the steel material for an oil country tubular good may be 1.25 to 1.35% by mass, for example, 1.25%, 1.26%, 1.27%, 1.28%, 1.29%, 1.3%, 1.31%, 1.32%, 1.33%, 1.34%, or 1.35%, but is not limited to the above-mentioned values, and other combinations not shown in this range are also applicable.
In the present invention, V in the steel material for an oil country tubular good may be 0.1 to 0.12% by mass, for example, 0.1%, 0.105%, 0.11%, 0.115% or 0.12% by mass, but is not limited to the above-mentioned values, and other combinations not shown in the above-mentioned range are also applicable.
In the present invention, the content of N in the steel material for an oil country tubular good is 0.006 to 0.01% by mass, and for example, it may be 0.006%, 0.007%, 0.008%, 0.009%, or 0.01% by mass, but not limited to the above-mentioned values, and other combinations not listed in this range are also applicable.
In the present invention, Al in the steel material for an oil country tubular good may be 0.025 to 0.04% by mass, for example, 0.025%, 0.026%, 0.028%, 0.03%, 0.032%, 0.034%, 0.036%, 0.038%, or 0.04%, but is not limited to the above-mentioned values, and other combinations not shown in the above-mentioned range are also applicable.
In the present invention, P in the steel material for an oil country tubular good may be 0.015% or less, for example, 0.015%, 0.014%, 0.013%, 0.012%, 0.011%, 0.01% or 0.005% by mass, but is not limited to the above-mentioned numerical values, and other combinations not shown in the above-mentioned range are also applicable.
In the present invention, the content of O in the steel material for an oil casing joint hoop material is not more than 0.002%, 0.0018%, 0.0016%, 0.0014%, 0.0012%, or 0.001% by mass, but is not limited to the recited values, and other combinations not recited in the range are also applicable.
In the present invention, the content of Cr in the steel material for an oil country tubular good is 0.1% by mass or less, and may be, for example, 0.1%, 0.08%, 0.06%, 0.04%, or 0.02%, but not limited to the above-mentioned values, and other combinations not listed in this range are also applicable.
In the present invention, the content of Mo in the steel material for an oil country tubular good is not more than 0.05% by mass, and may be, for example, 0.05%, 0.04%, 0.03%, 0.02%, or 0.01%, but is not limited to the above-mentioned values, and other combinations not shown in the above-mentioned range are also applicable.
In the present invention, the Ni content in the steel material for an oil country tubular good is 0.2% by mass or less, and may be, for example, 0.2%, 0.18%, 0.16%, 0.14%, 0.12%, 0.1%, 0.05%, or 0.01%, but is not limited to the above-mentioned values, and other combinations not shown in this range are also applicable.
In the present invention, the Cu content in the steel material for an oil country tubular good is 0.2% by mass or less, and may be, for example, 0.2%, 0.18%, 0.16%, 0.14%, 0.12%, 0.1%, 0.05%, or 0.01%, but is not limited to the above-mentioned values, and other combinations not shown in this range are also applicable.
In the present invention, the content of Pb + Sn + As + Sb + Bi in the steel material for an oil country tubular good is not more than 0.005% by mass, and may be, for example, 0.005%, 0.004%, 0.003%, 0.002% or 0.001%, but not limited to the above-mentioned values, and other combinations not shown in the above-mentioned range are also applicable.
In a second aspect, the present invention provides a method of producing a steel material according to the first aspect, the method comprising:
carrying out converter vanadium extraction, desulfurization, converter steelmaking, refining and continuous casting on blast furnace molten iron in sequence to obtain the steel;
wherein the superheat degree of the continuous casting is 15-30 ℃; the specific water amount L/kg in the gas-water secondary cooling for continuous casting is 0.2-0.3; the electromagnetic stirring mode of the solidification section in the continuous casting is forward rotation for 15-20s, stop rotation for 3-5s and reverse rotation for 15-20 s.
According to the preparation method provided by the invention, the process in continuous casting is adjusted, and the specific stirring mode is adopted in the solidification section to improve the low-power quality of the casting blank, so that the performance of the obtained steel is further enhanced, the performance of the steel without tempering can be further enhanced, and the carbon segregation range of the section of the continuous casting blank is controlled to be less than or equal to 0.03%.
In the present invention, the degree of superheat of the continuous casting is 15 to 30 ℃ and may be, for example, 15 ℃, 20 ℃, 25 ℃ or 30 ℃, but is not limited to the values listed, and other combinations not listed within the range are also applicable.
In the present invention, the specific water amount L/kg in the gas-water secondary cooling for continuous casting is 0.2 to 0.3, and may be, for example, 0.2, 0.22, 0.24, 0.26, 0.28 or 0.3, but is not limited to the above-mentioned values, and other combinations not shown in the above-mentioned range are also applicable.
In the present invention, the normal rotation of 15 to 20s in the electromagnetic stirring method of the solidification stage in the continuous casting may be, for example, 15s, 16s, 17s, 18s, 19s or 20s, but is not limited to the above-mentioned values, and other combinations not shown in the above range are also applicable.
In the present invention, the inversion time of 15 to 20s in the electromagnetic stirring method of the solidification step in the continuous casting may be, for example, 15s, 16s, 17s, 18s, 19s or 20s, but is not limited to the above-mentioned values, and other combinations not shown in the above range are also applicable.
In a preferred embodiment of the present invention, the content of residual vanadium in the semisteel obtained by vanadium extraction in the converter is not less than 0.01%, and may be, for example, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.08%, or 0.1%, but is not limited to the above-mentioned values, and other combinations not shown in the above range are also applicable.
Preferably, the temperature of the semi-molten steel obtained in the vanadium extraction in the converter is 1360-.
As a preferred technical scheme of the invention, the reagent in desulfurization comprises lime and aluminum particles. The addition amount of the lime and the aluminum particles is determined according to the oxygen content and the sulfur content in the product.
Preferably, the stirring speed in the desulfurization is 80r/min or more, for example, 80r/min, 85r/min, 90r/min, 95r/min or 100r/min, etc., but is not limited to the values listed, and other combinations not listed within the range are also applicable.
Preferably, the stirring time in the desulfurization is 15 to 20min, for example, 15min, 16min, 17min, 18min, 19min, or 20min, etc., but is not limited to the values listed, and other combinations not listed within this range are also applicable.
In a preferred embodiment of the present invention, the end point of the desulfurization is 0.005% or less, for example, 0.005%, 0.004%, 0.003%, 0.002% or 0.001% by mass, but is not limited to the above-mentioned values, and other combinations not shown in the above-mentioned range are also applicable.
Preferably, the slagging-off rate in the desulfurization is not less than 90%, and may be, for example, 90%, 92%, 94%, 96%, 98%, or 99%, but is not limited to the values listed, and other combinations not listed within the range are also applicable.
In a preferred embodiment of the present invention, the end point C content in converter steelmaking is 0.06 to 0.1% by mass, and may be, for example, 0.06%, 0.07%, 0.08%, 0.09%, or 0.1%, but is not limited to the above-mentioned values, and other combinations not shown in the above-mentioned range are also applicable.
Preferably, manganese-silicon alloy, high-carbon ferromanganese, vanadium-nitrogen alloy and vanadium sheets are added according to the formula for alloying in converter steelmaking.
Preferably, the aluminum material added to the molten iron of 2 to 3 kg/ton before tapping for 30 seconds in the converter steel making may be, for example, 2 kg/ton of molten iron, 2.2 kg/ton of molten iron, 2.4 kg/ton of molten iron, 2.6 kg/ton of molten iron, 2.8 kg/ton of molten iron, or 3 kg/ton of molten iron, but is not limited to the above-mentioned values, and other combinations not shown in the above-mentioned range are also applicable.
Preferably, the content of the terminal P in the converter steelmaking is 0.008% by mass or less, for example, 0.008%, 0.007%, 0.006%, 0.005%, 0.004%, 0.003%, 0.002% or 0.001%, and the like, but not limited to the above-mentioned values, and other combinations not listed in this range are also applicable.
Preferably, the end point temperature of converter steelmaking is 1620-.
In a preferred embodiment of the present invention, the retention time of the white slag in the refining is not less than 15min, for example, 15min, 16min, 17min, 18min, 19min, 20min, 25min, or 30min, but is not limited to the above-mentioned values, and other combinations not listed in this range are also applicable.
Preferably, the mass ratio of calcium to aluminum in the molten steel during the refining is (0.1-0.14):1, and may be, for example, 0.1:1, 0.11:1, 0.12:1, 0.13:1 or 0.14:1, but is not limited to the values listed, and other combinations not listed within this range are also applicable.
According to the invention, the inclusion in the molten steel is subjected to denaturation treatment by regulating the aluminum-calcium ratio in the molten steel, so that the content of the inclusion in the steel is reduced.
Preferably, the time of the soft blowing in the refining is 20min or more, and may be, for example, 20min, 30min, 40min, 50min, 60min or 70min, etc., but is not limited to the values listed, and other combinations not listed in the range are also applicable.
As a preferable embodiment of the present invention, the drawing speed in the continuous casting is 0.75 to 0.8m/min, and may be, for example, 0.75m/min, 0.76m/min, 0.77m/min, 0.78m/min, 0.79m/min or 0.8m/min, but is not limited to the above-mentioned values, and other combinations not shown in the above range are also applicable.
Preferably, the continuous casting crystal segment is stirred electromagnetically at a current of 300-350A, such as 300A, 310A, 320A, 330A, 340A or 350A, but not limited to the values listed, and other combinations not listed within this range are equally applicable, and the frequency is 2.5-3Hz, such as 2.5Hz, 2.6Hz, 2.7Hz, 2.8Hz, 2.9Hz or 3Hz, but not limited to the values listed, and other combinations not listed within this range are equally applicable.
Preferably, the solidification section in continuous casting is stirred electromagnetically, the current is 610-620A, such as 610A, 612A, 614A, 616A, 618A or 620A, but not limited to the values listed, and other combinations not listed in the range are equally applicable, and the frequency is 8-10Hz, such as 8Hz, 9Hz or 10Hz, but not limited to the values listed, and other combinations not listed in the range are equally applicable.
In a preferred embodiment of the present invention, when the slab obtained by the continuous casting is gradually cooled, the temperature of the cooling bed on the slab is not less than 600 ℃, and may be, for example, 600 ℃, 700 ℃, 800 ℃, 900 ℃, or 1000 ℃, but not limited to the above-mentioned values, and other combinations not listed in this range are also applicable.
Preferably, when the cast slab obtained by the continuous casting is gradually cooled, the temperature of the cast slab entering the slow cooling pit is not less than 550 ℃, for example, 550 ℃, 560 ℃, 570 ℃, 580 ℃, 590 ℃ or 600 ℃, but is not limited to the values listed, and other combinations not listed in the range are also applicable.
Preferably, the cooling time of the cooling pit is not less than 24h, such as 24h, 25h, 26h, 27h, 28h, 29h or 30h, but not limited to the values listed, and other combinations not listed within this range are also applicable.
Preferably, the pit exit temperature of the cast slab in the annealing pit is 150 ℃ or lower, and may be, for example, 150 ℃, 140 ℃, 130 ℃, 120 ℃, 110 ℃ or 100 ℃, but is not limited to the values listed, and other combinations not listed within the range are also applicable.
As a preferred technical solution of the present invention, the preparation method comprises:
carrying out converter vanadium extraction, desulfurization, converter steelmaking, refining and continuous casting on blast furnace molten iron in sequence to obtain the steel;
wherein the content of residual vanadium in the semisteel water obtained in the vanadium extraction by the converter is more than or equal to 0.01 percent; the temperature of the semi-molten steel obtained in the vanadium extraction of the converter is 1360-; the reagent in desulfurization comprises lime and aluminum particles; the stirring speed in the desulfurization is more than or equal to 80 r/min; the stirring time in the desulfurization is 15-20 min; the end point of the desulfurization is that the S content is less than or equal to 0.005 percent by mass percentage; the slagging-off rate in the desulfurization is more than or equal to 90 percent; the end point C content of the converter steelmaking is 0.06-0.1% by mass percent; adding manganese-silicon alloy, high-carbon ferromanganese, vanadium-nitrogen alloy and vanadium sheets according to a formula in the converter steelmaking for alloying; adding 2-3 kg/ton molten iron aluminum material before tapping for 30s in the converter steelmaking; the content of the end point P of the converter steelmaking is less than or equal to 0.008 percent by mass; the end point temperature of the converter steelmaking is 1620-1640 ℃; the holding time of the white slag in the refining is more than or equal to 15 min; the mass ratio of calcium to aluminum in the molten steel in the refining is (0.1-0.14) to 1; the time of soft blowing in refining is more than or equal to 20 min; the drawing speed in the continuous casting is 0.75-0.8 m/min; electromagnetic stirring is adopted in the continuous casting crystallization section, the current is 300-350A, and the frequency is 2.5-3 Hz; electromagnetic stirring is adopted in the solidification section in continuous casting, the current is 610-620A, and the frequency is 8-10 Hz; the superheat degree of the continuous casting is 15-30 ℃; the specific water amount L/kg in the gas-water secondary cooling for continuous casting is 0.2-0.3; the electromagnetic stirring mode of the solidification section in the continuous casting is forward rotation for 15-20s, stop rotation for 3-5s and reverse rotation for 15-20 s; when the casting blank obtained by continuous casting is slowly cooled, the temperature of a cooling bed on the casting blank is more than or equal to 600 ℃; when the casting blank obtained by continuous casting is slowly cooled, the temperature of the casting blank entering a slow cooling pit is more than or equal to 550 ℃; the cooling time of the slow cooling pit is more than or equal to 24 hours; the pit outlet temperature of the casting blank in the slow cooling pit is less than or equal to 150 ℃.
Compared with the prior art, the invention at least has the following beneficial effects:
(1) vanadium and nitrogen are introduced in the smelting process through adjusting the components to form a micro-alloy phase so as to improve the stability of the performance of the steel pipe, and meanwhile, the yield strength of 379-552MPa, the tensile strength of more than or equal to 655MPa and the longitudinal impact energy of more than or equal to 27J can be achieved without quenching and tempering.
(2) The performance of the obtained steel is further enhanced by improving and controlling the carbon segregation range to be less than or equal to 0.03 percent in the continuous casting process, the steel can still achieve good performance without quenching and tempering, and the steel can be used for the petroleum casing connecting hoop material.
Detailed Description
To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:
example 1
The embodiment provides a steel for an oil casing coupling material, which comprises the following components in percentage by mass:
0.26% of C, 0.2% of Si, 1.3% of Mn, 0.11% of V, 0.008% of N, 0.03% of Al, 0.015% of P, 0.004% of S, 0.002% of O, 0.1% of Cr, 0.05% of Mo, 0.2% of Ni, 0.2% of Cu, Pb + Sn + As + Sb + Bi0.005%, and the balance of Fe and other inevitable impurities.
The preparation method comprises the following steps:
carrying out converter vanadium extraction, desulfurization, converter steelmaking, refining and continuous casting on blast furnace molten iron in sequence to obtain the steel;
wherein the content of residual vanadium in the semisteel water obtained in the vanadium extraction by the converter is 0.01 percent; the temperature of the semi-molten steel obtained in the converter vanadium extraction is 1380 ℃; the reagent in desulfurization comprises lime and aluminum particles; the stirring speed in the desulfurization is 80 r/min; the stirring time in the desulfurization is 17 min; the end point of the desulfurization is that the S content is 0.005 percent by mass; the slagging-off rate in the desulfurization is 90 percent; the content of the end point C of the converter steelmaking is 0.08 percent by mass; adding manganese-silicon alloy, high-carbon ferromanganese, vanadium-nitrogen alloy and vanadium sheets according to a formula in the converter steelmaking for alloying; adding 2.5 kg/ton molten iron aluminum material before tapping for 30s in the converter steelmaking; the content of the terminal P of the converter steelmaking is 0.008 percent by mass; the end point temperature of the converter steelmaking is 1630 ℃; the holding time of the white slag in the refining is 15 min; the mass ratio of calcium to aluminum in the molten steel in the refining is 0.12: 1; the soft blowing time in the refining is 20 min; the drawing speed in the continuous casting is 0.77 m/min; the continuous casting crystallization section adopts electromagnetic stirring, the current is 325A, and the frequency is 2.7 Hz; electromagnetic stirring is adopted in the solidification section in continuous casting, the current is 615A, and the frequency is 9 Hz; the superheat degree of the continuous casting is 22 ℃; the specific water amount L/kg in the gas-water secondary cooling of the continuous casting is 0.25; the electromagnetic stirring mode of the continuous casting middle solidification section is forward rotation for 17s, stop for 4s and reverse rotation for 17 s; when the casting blank obtained by continuous casting is slowly cooled, the temperature of a cooling bed on the casting blank is 600 ℃; when the casting blank obtained by continuous casting is slowly cooled, the temperature of the casting blank entering a slow cooling pit is 550 ℃; the cooling time of the slow cooling pit is 24 hours; and the pit outlet temperature of the casting blank in the slow cooling pit is 150 ℃.
The indices of the steel obtained are specified in Table 1.
Example 2
The embodiment provides a steel for an oil casing coupling material, which comprises the following components in percentage by mass:
0.28% of C, 0.17% of Si, 1.25% of Mn, 0.1% of V, 0.01% of N, 0.04% of Al, 0.01% of P, 0.002% of S, 0.001% of O, 0.01% of Cr, 0.01% of Mo, 0.1% of Ni, 0.1% of Cu, Pb + Sn + As + Sb + Bi0.001%, and the balance of Fe and other inevitable impurities.
The preparation method comprises the following steps:
carrying out converter vanadium extraction, desulfurization, converter steelmaking, refining and continuous casting on blast furnace molten iron in sequence to obtain the steel;
wherein the content of residual vanadium in the semisteel water obtained in the vanadium extraction in the converter is 0.05 percent; the temperature of the semi-molten steel obtained in the vanadium extraction in the converter is 1400 ℃; the reagent in desulfurization comprises lime and aluminum particles; the stirring speed in the desulfurization is 90 r/min; the stirring time in the desulfurization is 20 min; the end point of the desulfurization is that the S content is 0.001 percent by mass; the slagging-off rate in the desulfurization is 98 percent; the content of the end point C of the converter steelmaking is 0.1 percent by mass; adding manganese-silicon alloy, high-carbon ferromanganese, vanadium-nitrogen alloy and vanadium sheets according to a formula in the converter steelmaking for alloying; adding 3 kg/ton molten iron aluminum material before tapping for 30s in the converter steelmaking; the content of the end point P of the converter steelmaking is 0.001 percent by mass; the end point temperature of the converter steelmaking is 1640 ℃; the holding time of the white slag in the refining is 25 min; the mass ratio of calcium to aluminum in the molten steel in the refining is 0.14: 1; the soft blowing time in the refining is 40 min; the drawing speed in the continuous casting is 0.75 m/min; the continuous casting crystallization section adopts electromagnetic stirring, the current is 350A, and the frequency is 3 Hz; electromagnetic stirring is adopted in the solidification section in continuous casting, the current is 610A, and the frequency is 8 Hz; the superheat degree of the continuous casting is 15 ℃; the specific water amount L/kg in the gas-water secondary cooling of the continuous casting is 0.2; the electromagnetic stirring mode of the continuous casting middle solidification section is forward rotation for 15s, stop for 3s and reverse rotation for 15 s; when the casting blank obtained by continuous casting is slowly cooled, the temperature of a cooling bed on the casting blank is 700 ℃; when the casting blank obtained by continuous casting is slowly cooled, the temperature of the casting blank entering a slow cooling pit is 650 ℃; the cooling time of the slow cooling pit is 34 h; and the pit outlet temperature of the casting blank in the slow cooling pit is 120 ℃.
The indices of the steel obtained are specified in Table 1.
Example 3
The embodiment provides a steel for an oil casing coupling material, which comprises the following components in percentage by mass:
0.25% of C, 0.3% of Si, 1.35% of Mn, 0.12% of V, 0.006% of N, 0.025% of Al, 0.011% of P, 0.003% of S, 0.0015% of O, 0.015% of Cr, 0.03% of Mo, 0.01% of Ni, 0.02% of Cu, 0.003% of Pb + Sn + As + Sb + Bi, and the balance of Fe and other inevitable impurities.
The preparation method comprises the following steps:
carrying out converter vanadium extraction, desulfurization, converter steelmaking, refining and continuous casting on blast furnace molten iron in sequence to obtain the steel;
wherein the content of residual vanadium in the semisteel water obtained in the vanadium extraction by the converter is 0.1%; the temperature of semi-molten steel obtained in the vanadium extraction of the converter is 1360 ℃; the reagent in desulfurization comprises lime and aluminum particles; the stirring speed in the desulfurization is 100 r/min; the stirring time in the desulfurization is 15 min; the end point of the desulfurization is that the S content is 0.003 percent by mass; the slagging-off rate in the desulfurization is 93 percent; the content of the end point C of the converter steelmaking is 0.06 percent by mass; adding manganese-silicon alloy, high-carbon ferromanganese, vanadium-nitrogen alloy and vanadium sheets according to a formula in the converter steelmaking for alloying; adding 2 kg/ton molten iron aluminum material before tapping for 30s in the converter steelmaking; the content of the end point P of the converter steelmaking is 0.003 percent by mass; the end point temperature of the converter steelmaking is 1620 ℃; the holding time of the white slag in the refining is 35 min; the mass ratio of calcium to aluminum in the molten steel in the refining is 0.1: 1; the soft blowing time in the refining is 40 min; the drawing speed in the continuous casting is 0.8 m/min; the continuous casting crystallization section adopts electromagnetic stirring, the current is 300A, and the frequency is 2.5 Hz; electromagnetic stirring is adopted in the solidification section in continuous casting, the current is 620A, and the frequency is 10 Hz; the superheat degree of the continuous casting is 30 ℃; the specific water amount L/kg in the gas-water secondary cooling of the continuous casting is 0.3; the electromagnetic stirring mode of the solidification section in the continuous casting is positive rotation for 20s, stopping for 5s and reverse rotation for 20 s; when the casting blank obtained by continuous casting is slowly cooled, the temperature of a cooling bed on the casting blank is 800 ℃; when the casting blank obtained by continuous casting is slowly cooled, the temperature of the casting blank entering a slow cooling pit is 550 ℃; the cooling time of the slow cooling pit is 30 h; and the pit outlet temperature of the casting blank in the slow cooling pit is 100 ℃.
The indices of the steel obtained are specified in Table 1.
Comparative example 1
The steel differs from example 1 only in that no N element is added, and the indices of the steel obtained are specified in Table 1.
Comparative example 2
The steel differs from example 1 only in that the element V is not added, and the indices of the steel obtained are specified in Table 1.
Comparative example 3
The difference from example 1 is only that the solidification stage is stirred by continuous forward rotation, and the indexes of the obtained steel are detailed in Table 2.
TABLE 1
TABLE 2
Note: and the standard value required by the oil casing coupling material in use.
According to the results of the embodiment and the comparative example, vanadium and nitrogen are introduced in the smelting process through adjusting the components to form a micro-alloy phase so as to improve the stability of the performance of the steel pipe, meanwhile, the yield strength of 379-552MPa, the tensile strength of more than or equal to 655MPa and the longitudinal impact energy of more than or equal to 27J can be achieved without quenching and tempering, meanwhile, the low-power quality of the obtained steel is controlled through improving the continuous casting process, so that the extremely poor segregation of carbon is optimally controlled to be less than or equal to 0.03%, the performance of the obtained steel is further enhanced, the steel can still achieve good performance without quenching and tempering, the steel can be used for the connecting hoop material of the petroleum casing, and the service life is obviously prolonged.
The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. The steel for the oil casing coupling material is characterized by comprising the following components in percentage by mass:
0.25 to 0.28 percent of C, 0.17 to 0.3 percent of Si, 1.25 to 1.35 percent of Mn, 0.1 to 0.12 percent of V, 0.006 to 0.01 percent of N, 0.025 to 0.04 percent of Al, less than or equal to 0.015 percent of P, less than or equal to 0.004 percent of S, less than or equal to 0.002 percent of O, less than or equal to 0.1 percent of Cr, less than or equal to 0.05 percent of Mo, less than or equal to 0.2 percent of Ni, less than or equal to 0.2 percent of Cu, less than or equal to 0.005 percent of Pb, Sn, As, Sb and Bi, and the balance of Fe and other inevitable impurities.
2. The method of producing a steel product as claimed in claim 1, characterized in that the production method comprises:
carrying out converter vanadium extraction, desulfurization, converter steelmaking, refining and continuous casting on blast furnace molten iron in sequence to obtain the steel;
wherein the superheat degree of the continuous casting is 15-30 ℃; the specific water amount L/kg in the gas-water secondary cooling for continuous casting is 0.2-0.3; the electromagnetic stirring mode of the solidification section in the continuous casting is forward rotation for 15-20s, stop rotation for 3-5s and reverse rotation for 15-20 s.
3. The preparation method according to claim 2, wherein the content of residual vanadium in the semisteel water obtained in the vanadium extraction in the converter is more than or equal to 0.01 percent;
preferably, the temperature of the semi-molten steel obtained in the vanadium extraction in the converter is 1360-.
4. A method of manufacturing as claimed in claim 2 or 3, wherein the reagents in the desulphurisation comprise lime and aluminium particles;
preferably, the stirring speed in the desulfurization is more than or equal to 80 r/min;
preferably, the stirring time in the desulfurization is 15 to 20 min.
5. The production method according to any one of claims 2 to 4, wherein the end point of desulfurization is 0.005% or less in S content by mass;
preferably, the slagging-off rate in the desulfurization is more than or equal to 90 percent.
6. The method according to any one of claims 2 to 5, wherein the end point C content of the converter steelmaking is 0.06 to 0.1% by mass;
preferably, manganese-silicon alloy, high-carbon ferromanganese, vanadium-nitrogen alloy and vanadium sheets are added according to the formula for alloying in the converter steelmaking;
preferably, 2-3 kg/ton of molten iron aluminum material is added before tapping for 30s in converter steelmaking;
preferably, the content of the terminal P in the converter steelmaking is less than or equal to 0.008 percent by mass;
preferably, the end point temperature of the converter steelmaking is 1620-.
7. The method according to any one of claims 2 to 6, wherein the white slag is maintained for a period of 15min or more during the refining;
preferably, the mass ratio of calcium to aluminum in the molten steel in the refining is (0.1-0.14): 1;
preferably, the time of soft blowing in the refining is more than or equal to 20 min.
8. The production method according to any one of claims 2 to 7, wherein the drawing speed in the continuous casting is 0.75 to 0.8 m/min;
preferably, the continuous casting crystallization section adopts electromagnetic stirring, the current is 300-350A, and the frequency is 2.5-3 Hz;
preferably, the solidification section in the continuous casting adopts electromagnetic stirring, the current is 610-620A, and the frequency is 8-10 Hz.
9. The method according to any one of claims 2 to 8, wherein when the continuous casting is performed to obtain a cast slab, the temperature of a cooling bed on the cast slab is not less than 600 ℃;
preferably, when the casting blank obtained by continuous casting is slowly cooled, the temperature of the casting blank entering a slow cooling pit is more than or equal to 550 ℃;
preferably, the cooling time of the slow cooling pit is more than or equal to 24 h;
preferably, the pit outlet temperature of the casting blank in the slow cooling pit is less than or equal to 150 ℃.
10. The method of any one of claims 2-9, comprising:
carrying out converter vanadium extraction, desulfurization, converter steelmaking, refining and continuous casting on blast furnace molten iron in sequence to obtain the steel;
wherein the content of residual vanadium in the semisteel water obtained in the vanadium extraction by the converter is more than or equal to 0.01 percent; the temperature of the semi-molten steel obtained in the vanadium extraction of the converter is 1360-;
the reagent in desulfurization comprises lime and aluminum particles; the stirring speed in the desulfurization is more than or equal to 80 r/min; the stirring time in the desulfurization is 15-20 min; the end point of the desulfurization is that the S content is less than or equal to 0.005 percent by mass percentage; the slagging-off rate in the desulfurization is more than or equal to 90 percent;
the end point C content of the converter steelmaking is 0.06-0.1% by mass percent; adding manganese-silicon alloy, high-carbon ferromanganese, vanadium-nitrogen alloy and vanadium sheets according to a formula in the converter steelmaking for alloying; adding 2-3 kg/ton molten iron aluminum material before tapping for 30s in the converter steelmaking; the content of the end point P of the converter steelmaking is less than or equal to 0.008 percent by mass; the end point temperature of the converter steelmaking is 1620-1640 ℃;
the holding time of the white slag in the refining is more than or equal to 15 min; the mass ratio of calcium to aluminum in the molten steel in the refining is (0.1-0.14) to 1; the time of soft blowing in refining is more than or equal to 20 min;
the drawing speed in the continuous casting is 0.75-0.8 m/min; electromagnetic stirring is adopted in the continuous casting crystallization section, the current is 300-350A, and the frequency is 2.5-3 Hz; electromagnetic stirring is adopted in the solidification section in continuous casting, the current is 610-620A, and the frequency is 8-10 Hz; the superheat degree of the continuous casting is 15-30 ℃; the specific water amount L/kg in the gas-water secondary cooling for continuous casting is 0.2-0.3; the electromagnetic stirring mode of the solidification section in the continuous casting is forward rotation for 15-20s, stop rotation for 3-5s and reverse rotation for 15-20 s;
when the casting blank obtained by continuous casting is slowly cooled, the temperature of a cooling bed on the casting blank is more than or equal to 600 ℃; when the casting blank obtained by continuous casting is slowly cooled, the temperature of the casting blank entering a slow cooling pit is more than or equal to 550 ℃; the cooling time of the slow cooling pit is more than or equal to 24 hours; the pit outlet temperature of the casting blank in the slow cooling pit is less than or equal to 150 ℃.
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| CN114645203A (en) * | 2022-03-17 | 2022-06-21 | 承德建龙特殊钢有限公司 | Steel for petroleum casing pipe and preparation method thereof |
| CN114892088A (en) * | 2022-05-18 | 2022-08-12 | 承德建龙特殊钢有限公司 | Hot-rolled X60 steel-grade seamless pipeline pipe and preparation method thereof |
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| CN114892088A (en) * | 2022-05-18 | 2022-08-12 | 承德建龙特殊钢有限公司 | Hot-rolled X60 steel-grade seamless pipeline pipe and preparation method thereof |
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