CN114774779A - Hot-rolled round steel for Christmas tree valve in oil field in alpine region and preparation method thereof - Google Patents
Hot-rolled round steel for Christmas tree valve in oil field in alpine region and preparation method thereof Download PDFInfo
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- 239000010959 steel Substances 0.000 title claims abstract description 75
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- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 56
- 238000005096 rolling process Methods 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 43
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 25
- 239000000956 alloy Substances 0.000 claims abstract description 25
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 16
- 229910052742 iron Inorganic materials 0.000 claims abstract description 16
- 238000003723 Smelting Methods 0.000 claims abstract description 13
- 238000009749 continuous casting Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 13
- 239000003921 oil Substances 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 12
- 238000009849 vacuum degassing Methods 0.000 claims abstract description 12
- 239000011572 manganese Substances 0.000 claims abstract description 11
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 9
- 238000007670 refining Methods 0.000 claims abstract description 9
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 9
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 6
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 4
- 239000002893 slag Substances 0.000 claims description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 14
- 238000007664 blowing Methods 0.000 claims description 13
- 238000005266 casting Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 238000010079 rubber tapping Methods 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 8
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 8
- 239000004571 lime Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 229910001021 Ferroalloy Inorganic materials 0.000 claims description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 5
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 4
- 229910000628 Ferrovanadium Inorganic materials 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 claims description 4
- 238000000265 homogenisation Methods 0.000 claims description 4
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 239000001095 magnesium carbonate Substances 0.000 claims description 3
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 3
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 3
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 3
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims 1
- 238000005098 hot rolling Methods 0.000 claims 1
- 230000002087 whitening effect Effects 0.000 claims 1
- 239000011651 chromium Substances 0.000 abstract description 9
- 238000007689 inspection Methods 0.000 abstract description 7
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 4
- 239000010703 silicon Substances 0.000 abstract description 4
- 239000010421 standard material Substances 0.000 abstract description 4
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005275 alloying Methods 0.000 abstract 1
- 235000004507 Abies alba Nutrition 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000378 calcium silicate Substances 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 3
- HBXWYZMULLEJSG-UHFFFAOYSA-N chromium vanadium Chemical compound [V][Cr][V][Cr] HBXWYZMULLEJSG-UHFFFAOYSA-N 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 1
- 102000005298 Iron-Sulfur Proteins Human genes 0.000 description 1
- 108010081409 Iron-Sulfur Proteins Proteins 0.000 description 1
- 229910000720 Silicomanganese Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
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- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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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
-
- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
- B21B1/466—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 metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before 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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a hot-rolled round steel for a Christmas tree valve in an oil field in an alpine region and a preparation method thereof, wherein the hot-rolled round steel comprises the following alloy components: less than or equal to 0.23 percent of C, 1.00 to 1.35 percent of Mn, 0.15 to 0.30 percent of Si, less than or equal to 0.030 percent of P, less than or equal to 0.020 percent of S, less than or equal to 0.30 percent of Cr, less than or equal to 0.10 percent of Mo, less than or equal to 0.03 percent of V, less than or equal to 0.30 percent of Cu, less than or equal to 0.40 percent of Ni, less than or equal to 0.02 percent of Nb, 0.010 to 0.030 percent of Alt, less than or equal to 0.43 percent of CEV, and the balance of Fe. The preparation process sequentially comprises the steps of molten iron pretreatment, converter smelting, LF furnace refining, RH vacuum degassing, continuous casting, heating by a heating furnace, rolling and cooling. The method adopts reasonable chemical components, controls certain carbon content of molten steel, adds elements such as chromium, silicon, manganese, vanadium and the like to carry out micro-alloying, and simultaneously designs a reasonable process to ensure that all comprehensive inspection indexes of the steel for the valve meet the requirements of users, so that the low-temperature impact property of the steel at the temperature of-46 ℃ can reach more than 200J and is far higher than that of the equivalent material of the American standard so as to replace the American standard material.
Description
Technical Field
The invention belongs to the field of metallurgical materials, and particularly relates to hot-rolled round steel for a Christmas tree valve in an oil field in a severe cold area and a preparation method thereof.
Background
Christmas trees are well heads used for producing oil, such as artesian wells and mechanical production wells. The Christmas tree component mainly comprises a tubing head, a tubing hanger, a flange and valves. The valve mainly comprises a choke valve, a production wing valve, a paraffin removal valve, a main valve and a sleeve valve. FM20MnE is mainly used for manufacturing valve bodies, valve covers and oil field pipeline valves of oil field Christmas tree valves, and is a key part for safe and stable operation in the field of new energy shale gas development in high and cold areas. The oil-gas field works under the special environment conditions of high cold (the temperature is minus 40 ℃ to minus 50 ℃) and acid gas and the like. Therefore, the material is required to have the characteristics of high steel purity, high strength, strong low-temperature impact toughness, excellent corrosion resistance and wear resistance and the like. The most critical is low-temperature performance, especially the low-temperature performance of the hub after welding at-46 ℃ is not lower than 200J. Therefore, the high-strength FM20MnE steel has very high requirements on performance indexes such as low-temperature impact energy, yield strength, tensile strength and the like. Therefore, in the production of the steel FM20MnE for the valve, the requirements on processes such as steel component design, converter smelting, refining, continuous casting and the like are very strict. If the quality of any link is not ensured, the strength and the low-temperature impact property of the steel are unqualified.
At present, all domestic valve steels adopt American ASTM standard, and the mark is SA350-LF2 steel, but the low-temperature impact power ratio of the manufactured valve is 16J. Therefore, how to prepare the FM20MnE valve steel with various comprehensive inspection indexes meeting the actual requirements has great economic value and wide market prospect.
Disclosure of Invention
In order to solve the technical problems, the invention provides an FM20MnE hot-rolled round steel for a Christmas tree valve and a preparation method thereof, the method adopts reasonable chemical components, controls certain carbon content of molten steel, and then adds elements such as chromium, silicon, manganese, vanadium and the like to carry out microalloying, and simultaneously designs reasonable steelmaking process, heating process, low-temperature rolling process and cooling process to ensure that all comprehensive inspection indexes of the steel for the FM20MnE valve meet the user requirements, and the low-temperature impact performance of the steel can reach more than 200J and is far higher than the same material of the American standard so as to replace the same material of the American standard.
The specific invention content is as follows:
the hot-rolled round steel for the Christmas tree valve in the oil field in the alpine region comprises the following alloy components: less than or equal to 0.23 percent of C, 1.00 to 1.35 percent of Mn, 0.15 to 0.30 percent of Si, less than or equal to 0.030 percent of P, less than or equal to 0.020 percent of S, less than or equal to 0.30 percent of Cr, less than or equal to 0.10 percent of Mo, less than or equal to 0.03 percent of V, less than or equal to 0.30 percent of Cu, less than or equal to 0.40 percent of Ni, less than or equal to 0.02 percent of Nb, 0.010 to 0.030 percent of Alt, less than or equal to 0.43 percent of CEV, and the balance of Fe.
The invention also aims to provide a preparation method of the hot-rolled round steel for the Christmas tree valve in the oil field in the alpine region, wherein the process sequentially comprises the steps of molten iron pretreatment, converter smelting, LF furnace refining, RH vacuum degassing, continuous casting, heating furnace heating, rolling and cooling, wherein the converter smelting comprises the following steps: the raw materials are molten iron and scrap steel, the scrap steel accounts for 10-20%, and the iron80-90% of water, combined blowing and smelting in a converter, and large-flow oxygen blowing, wherein the oxygen flow is 40000Nm3And/h, blowing oxygen for 12-15 minutes, tapping at the temperature of 1679-1693 ℃, at the end point C of the converter being less than or equal to 0.10 percent, and at the end point P being less than or equal to 0.015 percent, and adding auxiliary materials, pre-deoxidizers and ferroalloys when tapping 1/4-1/3.
Preferably, the ton steel addition of the ferroalloy is as follows: 0.5-1 Kg/t of aluminum particles, 6-8 Kg/t of high manganese and 9-10 Kg/t of silicon manganese; the adding amount of auxiliary materials per ton of steel is as follows: 10-15 Kg/t magnesite and 25-35 Kg/t active lime; the addition amount of the pre-deoxidizer per ton of steel is as follows: 0.4-0.6 kg/t of aluminum balls.
Furthermore, the molten iron pretreatment process requires that the molten iron P is less than or equal to 0.080%, the Si content is 0.30-0.80%, the temperature is higher than 1280 ℃, the S content is less than or equal to 0.010%, and the slag thickness after slag skimming is less than or equal to 20 mm.
Further, the LF refining process comprises the following steps: adding 5-8 kg/t of steel with active lime, heating and slagging by adopting 45000A current, sampling and analyzing chemical components for the first time after 5min, and supplementing alloy and carburant according to target values of the chemical components, wherein the alloy and carburant are added to an argon flow to promote rapid melting and homogenization of the alloy and the carburant; aluminum balls are added for diffusion deoxidation in the temperature rising process, and the adding amount of each batch is not more than 20 kg; the addition amount of the replenished alloy per ton of steel is as follows: 0.5-1 kg/t of aluminum particles, 1-2 kg/t of medium manganese, 0.5-1.5 kg/t of ferrosilicon and 0.2-0.4 kg/t of ferrovanadium; the addition amount of each ton of steel of the recarburizing agent is as follows: 1.5-2.5 kg/t carbon powder; keeping the alkalinity of the molten slag at 4-7, keeping the time of slag white for more than 15min, and lifting RH vacuum degassing when the temperature of the molten steel reaches 1630-1640 ℃.
Further, the RH vacuum degassing process is: when the vacuum degree reaches below 100Pa, the alloy is replenished for 10-15 min according to the components of the molten steel, after the circulation is finished, the calcium silicate wire is fed into a furnace at a speed of 100-200 m/furnace, and the soft blowing time is 10-20 min.
Further, the continuous casting process comprises the following steps: the superheat degree of the tundish is controlled to be 20-30 ℃, the pulling speed is 0.5-1 m/min, the tundish H is controlled to be less than or equal to 3ppm, the electromagnetic stirring current of the crystallizer is 180-220A, the electromagnetic stirring current of the tail end is 330-370A, and the frequency is 5-7 Hz; the whole process is casting-protected, and the crystallizer casting powder is low-carbon casting powder; the casting blank is cut by flame; and (5) adopting a heat preservation vehicle to transport the continuous casting billet.
Further, the heating process of the heating furnace comprises the following steps: heating by adopting a stepping heating furnace, wherein the heating temperature is 1180-1210 ℃, the heating time of a preheating section is 52-85 minutes (the heating speed is 9 ℃/min), the heating time of a heating section 2 is 75-100 minutes (the heating speed is 8 ℃/min), the heating time of a heating section 1 is 70-100 minutes (the heating speed is 3 ℃/min), the heating time of a soaking section is 45-90 minutes, and the total heating time is more than or equal to 240 minutes.
Further, the rolling process comprises the following steps: cogging by adopting a 1150mm BD cogging mill, wherein the cogging temperature is more than or equal to 1130 ℃, rolling for 7 times, rolling with the large reduction of 92mm, passing through 3 frames of 850mm rolling mills and 1 frame of 735mm rolling mills, then entering 8 frames of continuous rolling mill groups for rolling, and entering 8 frames of continuous rolling to adopt a low-temperature rolling process, wherein the rolling temperature is less than or equal to 980 ℃.
Further, the cooling process comprises the following steps: air cooling in steel cooling bed at the temperature not higher than 200 deg.c.
The preparation method of the hot rolled round steel for the Christmas tree valve in the oil field of the alpine region further comprises the conventional step of preparing steel, such as a step of descaling by high-pressure water after the step of heating by a walking-beam heating furnace; the cooling step is followed by the process steps of finishing → inspection → warehousing, etc., and the process steps are carried out according to the mode disclosed by the prior art, so that the process requirements can be met.
The beneficial effects of the invention are as follows:
the invention 1 discloses a method for preparing a high-performance chromium-vanadium composite material, which is characterized in that a certain carbon content is controlled, elements such as chromium, silicon, manganese and vanadium are added, and after proper heat treatment, the low-temperature impact performance of the high-performance chromium-vanadium composite material can reach more than 200J and is far higher than that of a standard material in the United states, so that the high-performance chromium-vanadium composite material replaces the standard material in the United states.
2, the content of non-metallic inclusions is low, and the purity of steel is high.
3, the macrostructure, the nonmetallic inclusion and the mechanical property of the finished steel meet the requirements of the product.
4, the problem of poor quality stability of other methods is solved.
Drawings
FIG. 1 is a heating temperature profile of a walking beam furnace.
Detailed Description
The following non-limiting examples are presented to enable those of ordinary skill in the art to more fully understand the present invention and are not intended to limit the invention in any way.
The test methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.
One of the specific implementation modes is as follows:
a hot-rolled round steel for a Christmas tree valve in an oil field in a severe cold area comprises the following steps:
design of chemical components
C: less than or equal to 0.23 percent, Mn: 1.00-1.35%, Si: 0.15-0.30%, P: less than or equal to 0.030 percent, S: less than or equal to 0.020%, Cr: less than or equal to 0.30 percent, Mo: less than or equal to 0.10%, V: less than or equal to 0.03%, Cu: less than or equal to 0.30 percent, Ni: less than or equal to 0.40%, Nb: less than or equal to 0.02 percent, Alt: 0.010-0.030%, CEV: less than or equal to 0.43 percent, and the balance of Fe and inevitable impurities.
Secondly, the preparation method comprises the following steps:
1. the process comprises the following steps: molten iron in a blast furnace → pretreatment of molten iron → 180t converter smelting → LF refining → RH vacuum degassing → continuous casting of rectangular billet → heating in a walking beam furnace → high-pressure water descaling → rolling → cooling → finishing → inspection → warehousing.
2. Key technology
Pretreating molten iron: the method requires that the P content of molten iron is less than or equal to 0.080 percent, the Si content is 0.30-0.80 percent, and the temperature is more than 1280 ℃. The molten iron sulfur is required to be less than or equal to 0.010 percent after being treated, and the slag thickness after slag skimming is less than or equal to 20 mm.
Smelting in a converter: 10-20% of scrap steel and 80-90% of molten iron; performing converter combined blowing smelting, blowing oxygen at a large flow rate, wherein the tapping temperature is 1679-1693 ℃, the converter end point C is less than or equal to 0.10%, the P is less than or equal to 0.015%, and adding a pre-deoxidizer and an iron alloy when tapping is 1/4-1/3. Adding amount of alloy per ton steel: 0.5-1 Kg/t of aluminum particles, 6-8 Kg/t of high manganese and 9-10 Kg/t of silicon manganese. Adding auxiliary materials per ton of steel: 10-15 Kg/t magnesite and 25-35 Kg/t active lime.
LF refining: adding 5-8 kg of active lime into each ton of steel, raising the temperature by adopting a large current to melt slag, sampling for the first time after 5min to analyze chemical components, supplementing alloy according to the target value of the chemical components, and recarburizing, wherein the alloy and the recarburizing agent are added to argon flow to promote the rapid melting and homogenization of the alloy and the recarburizing agent. Aluminum balls are added for diffusion deoxidation in the temperature rising process, and the adding amount of each batch is not more than 20 kg. Alloy supplement: 0.5-1 kg/t of deoxidizer aluminum particles, 1-2 kg/t of medium manganese, 0.5-1.5 kg/t of ferrosilicon, 0.2-0.4 kg/t of ferrovanadium, 4-7 of slag alkalinity, more than 15min of white slag time, and when the temperature of molten steel reaches 1630-1640 ℃, RH vacuum degassing is carried out.
RH vacuum degassing: and when the vacuum degree reaches below 100Pa, keeping for 10-15 min, and adding alloy according to the components of the molten steel. And after the circulation is finished, feeding a calcium silicate wire into the furnace for 100-200 m/furnace, wherein the soft blowing time is more than 10 min.
Continuous casting: controlling the superheat degree of a tundish at 20-30 ℃, the pulling speed at 0.5m/min, controlling the tundish H to be less than or equal to 3ppm, controlling the electromagnetic stirring current of a crystallizer to be 200A, controlling the electromagnetic stirring current of the tail end to be 350A, and controlling the frequency to be 6 Hz; the whole process is casting-protected, and the crystallizer casting powder is low-carbon casting powder; and the casting blank is cut by flame. And (5) carrying the continuous casting billet by using a heat preservation vehicle.
Heating: the heating is carried out by adopting a stepping heating furnace, the heating temperature is 1180-1210 ℃, and the total heating time is more than or equal to 240 min.
Rolling: cogging by adopting a 1150mm BD cogging mill, rolling at the cogging temperature of more than or equal to 1130 ℃ for 7 times, rolling at a large reduction of 90-94 mm, passing through 3 frames of 850mm rolling mills and 1 frame of 735mm rolling mills, then entering 8 frames of tandem rolling units for rolling, and adopting a low-temperature rolling process in 8 frames of tandem rolling at the rolling temperature of less than or equal to 980 ℃.
And (3) cooling: air cooling in steel cooling bed at the temperature not higher than 200 deg.c.
Example 1
The best embodiment of the steel for manufacturing the FM20MnE valve by adopting the technical scheme of the invention patent comprises the following concrete implementation and production steps:
1. smelting in a converter
10% of scrap steel and 90% of molten iron; converter combined blowing smelting, large-flow oxygen blowing, steel tapping temperature of 1683 ℃, converter terminal C: 0.097%, P: 0.014%, adding pre-deoxidizer and ferroalloy when tapping 1/4-1/3. And (5) slag stopping and tapping, wherein the slag thickness is 80 mm. Adding amount of alloy per ton steel: 0.5Kg/t of aluminum particles, 7.4Kg/t of high manganese and 9.5Kg/t of silicomanganese. Adding auxiliary materials per ton of steel: 13.5Kg/t dolomite and 28Kg/t active lime.
2. LF refining
Adding 7kg of active lime steel, raising the temperature by adopting a large current, slagging, sampling for the first time after 5min, analyzing chemical components, adding alloy according to a target value of the chemical components, and recarburizing, wherein the alloy and the recarburizing agent are added to argon flow to promote the rapid melting and homogenization of the alloy and the recarburizing agent. Aluminum balls are added for diffusion deoxidation in the temperature rising process, and the adding amount of each batch is not more than 20 kg. Alloy supplement: 0.6kg/t of deoxidizer aluminum particles, 1.4kg/t of ferrosilicon and 0.3kg/t of ferrovanadium, the alkalinity of molten slag is kept to be 4-7, the time of white slag is more than 15min, the temperature of molten steel after LF treatment is 1640 ℃, and RH vacuum degassing is carried out.
3. RH vacuum degassing
When the vacuum degree reaches below 100Pa, the alloy is replenished according to the components of the molten steel for 11 min. After the circulation is finished, feeding a calcium silicate wire 200 m/furnace, and carrying out soft blowing for 14 min.
4. Continuous casting
The average superheat degree of the tundish is 27 ℃, the pulling speed is 0.5m/min, the tundish H1.5ppm, the electromagnetic stirring current of the crystallizer is 200A, the electromagnetic stirring current of the tail end is 350A, and the frequency is 6 Hz; the whole process is casting-protected, and the crystallizer casting powder is low-carbon casting powder; and the casting blank is cut by adopting flame. And (5) adopting a heat preservation vehicle to transport the continuous casting billet.
5. Heating of
The heating is carried out by adopting a stepping heating furnace, the heating temperature is 1200 ℃, and the total heating time is 300 min.
6. Rolling of
Cogging by adopting a 1150mm BD cogging mill, wherein the cogging temperature is 1140 ℃, rolling is carried out for 7 times, and the rolling reduction is as follows: 70mm for the 1 st pass, 80mm for the 2 nd pass, 74mm for the 3 rd pass, 81mm for the 4 th pass, 92mm for the 5 th pass, 30mm for the 6 th pass and 38mm for the 7 th pass through 3 frames of 850mm rolling mills and 1 frame of 735mm rolling mills, then entering 8 frames of continuous rolling mills for rolling, adopting low-temperature rolling for continuous rolling, wherein the rolling temperature is 970 ℃, and the production specification phi is 130 mm.
7. Cooling down
The steel is air-cooled, and the temperature of the lower cooling bed is 130 ℃.
The preparation method of the hot-rolled round steel for the Christmas tree valve in the oil field in the alpine region further comprises the conventional step of preparing steel, for example, the step of descaling by high-pressure water is also included after the step of heating by the stepping heating furnace; the cooling step comprises the process steps of finishing → inspection → warehousing and the like, and the process steps are carried out according to the mode disclosed by the prior art and meet the process requirements.
Product inspection and performance testing
The actual chemical composition values of the steel for manufacturing the FM20MnE valve are as follows:
0.16％C，1.31％Mn，0.26％Si，0.015％P，0.008％S，0.20％Cr，0.001％Mo，0.02％V，0.004％Cu，0.005％Ni，0.0007％Nb，0.016％Alt，0.423％CEV。
the carbon equivalent calculation formula is as follows: CEV (%) ═ C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15.
As can be seen from tables (1), (2) and (3), the steel for manufacturing the FM20MnE valve has high steel purity, compact internal structure and comprehensive mechanical properties meeting the requirements of users. The steel for the FM20MnE valve is prepared by microalloying the elements such as chromium, silicon, manganese, vanadium and the like on the molten steel, and the low-temperature impact property at the temperature of-46 ℃ can reach more than 200J and is far higher than that of the same material of the American standard so as to replace the American standard material.
TABLE (1) macrostructure test results
TABLE (2) examination results of non-metallic inclusions
TABLE (3) mechanical Property test results
Claims (10)
1. The utility model provides a be used for alpine region area oil field production tree valve hot rolling round steel which characterized in that: the alloy components of the hot-rolled round steel are as follows: less than or equal to 0.23 percent of C, 1.00 to 1.35 percent of Mn, 0.15 to 0.30 percent of Si, less than or equal to 0.030 percent of P, less than or equal to 0.020 percent of S, less than or equal to 0.30 percent of Cr, less than or equal to 0.10 percent of Mo, less than or equal to 0.03 percent of V, less than or equal to 0.30 percent of Cu, less than or equal to 0.40 percent of Ni, less than or equal to 0.02 percent of Nb, 0.010 to 0.030 percent of Alt, less than or equal to 0.43 percent of CEV, and the balance of Fe.
2. The preparation method of the hot-rolled round steel for the Christmas tree valve in the oil field of the alpine region as claimed in claim 1, is characterized in that: the process sequentially comprises the steps of molten iron pretreatment, converter smelting, LF furnace refining, RH vacuum degassing, continuous casting, heating by a heating furnace, rolling and cooling, wherein the converter smelting comprises the following steps: the raw materials comprise molten iron and scrap steel, the scrap steel accounts for 10-20%, the molten iron accounts for 80-90%, the oxygen flow is 40000Nm during combined blowing smelting in a converter3And/h, blowing oxygen for 12-15 minutes, tapping at the temperature of 1679-1693 ℃, at the end point C of the converter being less than or equal to 0.10 percent, and at the end point P being less than or equal to 0.015 percent, and adding auxiliary materials, pre-deoxidizers and ferroalloys when tapping 1/4-1/3.
3. The method of claim 2, wherein: the ton steel adding amount of the ferroalloy is as follows: 0.5 to 1Kg/t of aluminum particles, 6 to 8Kg/t of high manganese and 9 to 10Kg/t of silicon manganese; the addition amount of the auxiliary materials per ton of steel is as follows: 10-15 Kg/t magnesite and 25-35 Kg/t active lime; the addition amount of the pre-deoxidizer per ton of steel is as follows: 0.4-0.6 kg/t of aluminum balls.
4. The method of claim 2, wherein: the molten iron pretreatment process requires that the molten iron P is less than or equal to 0.080%, the Si content is 0.30-0.80%, the temperature is higher than 1280 ℃, the S content is less than or equal to 0.010%, and the slag thickness after slag skimming is less than or equal to 20 mm.
5. The method of claim 2, wherein: the LF refining process comprises the following steps: adding 5-8 kg/t of steel with active lime, heating and slagging by adopting 45000A current, sampling and analyzing chemical components for the first time after 5min, and supplementing alloy and carburant according to target values of the chemical components, wherein the alloy and carburant are added to an argon flow to promote rapid melting and homogenization of the alloy and the carburant; aluminum balls are added for diffusion deoxidation in the temperature rising process, and the adding amount of each batch is not more than 20 kg; the addition amount of the replenished alloy per ton steel is as follows: 0.5-1 kg/t of deoxidizer aluminum particles, 1-2 kg/t of medium manganese, 0.5-1.5 kg/t of ferrosilicon and 0.2-0.4 kg/t of ferrovanadium; the addition amount of each ton of steel of the recarburizing agent is as follows: 1.5-2.5 kg/t carbon powder; keeping the slag alkalinity at 4-7, keeping the slag whitening time for more than 15min, and lifting RH vacuum degassing when the molten steel temperature reaches 1630-1640 ℃.
6. The method of claim 2, wherein: the RH vacuum degassing process comprises the following steps: when the vacuum degree reaches below 100Pa, the maintaining time is 10-15 min, alloy is supplemented according to the components of molten steel, after the circulation is finished, a calcium-silicon wire is fed into the furnace at a speed of 100-200 m/furnace, and the soft blowing time is 10-20 min.
7. The method of claim 2, wherein: the continuous casting process comprises the following steps: the superheat degree of the tundish is controlled to be 20-30 ℃, the pulling speed is 0.5-1 m/min, the tundish H is controlled to be less than or equal to 3ppm, the electromagnetic stirring current of the crystallizer is 180-220A, the electromagnetic stirring current of the tail end is 330-370A, and the frequency is 5-7 Hz; the whole process is casting-protected, and the crystallizer casting powder is low-carbon casting powder; the casting blank is cut by adopting flame; and (5) adopting a heat preservation vehicle to transport the continuous casting billet.
8. The method of claim 2, wherein: the heating process of the heating furnace comprises the following steps: heating by adopting a stepping heating furnace, wherein the heating temperature is 1180-1210 ℃, the heating time of a preheating section is 52-85 minutes (the heating speed is 9 ℃/min), the heating time of a heating section 2 is 75-100 minutes (the heating speed is 8 ℃/min), the heating time of a heating section 1 is 70-100 minutes (the heating speed is 3 ℃/min), the heating time of a soaking section is 45-90 minutes, and the total heating time is more than or equal to 240 minutes.
9. The method of claim 2, wherein: the rolling process comprises the following steps: cogging by adopting a 1150mm BD cogging mill, wherein the cogging temperature is more than or equal to 1130 ℃, rolling for 7 times, rolling with the large reduction of 90-94 mm, passing through 3 frames of 850mm rolling mills and 1 frame of 735mm rolling mills, then entering 8 frames of continuous rolling mill groups for rolling, and entering 8 frames of continuous rolling to adopt a low-temperature rolling process, wherein the rolling temperature is less than or equal to 980 ℃.
10. The method of claim 2, wherein: the cooling process comprises the following steps: air cooling in steel cooling bed at the temperature not higher than 200 deg.c.
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