CN101871081A - Steel for low-steel-grade continuous oil pipe and manufacturing method thereof - Google Patents
Steel for low-steel-grade continuous oil pipe and manufacturing method thereof Download PDFInfo
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- CN101871081A CN101871081A CN200910049986A CN200910049986A CN101871081A CN 101871081 A CN101871081 A CN 101871081A CN 200910049986 A CN200910049986 A CN 200910049986A CN 200910049986 A CN200910049986 A CN 200910049986A CN 101871081 A CN101871081 A CN 101871081A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 73
- 239000010959 steel Substances 0.000 title claims abstract description 73
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000005096 rolling process Methods 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 19
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- 238000004321 preservation Methods 0.000 claims abstract description 10
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 7
- 238000005266 casting Methods 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 238000003303 reheating Methods 0.000 claims abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 4
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 24
- 238000007670 refining Methods 0.000 claims description 6
- 238000009749 continuous casting Methods 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 20
- 238000005516 engineering process Methods 0.000 description 14
- 230000008569 process Effects 0.000 description 12
- 238000005728 strengthening Methods 0.000 description 12
- 239000011651 chromium Substances 0.000 description 10
- 239000010949 copper Substances 0.000 description 8
- 239000011572 manganese Substances 0.000 description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 239000006104 solid solution Substances 0.000 description 7
- 238000005553 drilling Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 239000010936 titanium Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000922 High-strength low-alloy steel Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 239000010242 baoji Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to steel for a low-steel-grade continuous oil pipe, which comprises the following chemical components in percentage by weight: 0.03 to 0.17 percent of C, 0.10 to 0.60 percent of Si, 0.40 to 1.60 percent of Mn, not more than 0.015 percent of P, not more than 0.005 percent of S, 0.51 to 1.00 percent of Cr, 0.01 to 0.10 percent of Ti, 0.05 to 0.35 percent of Mo, 0.10 to 0.50 percent of Cu, not more than 0.15 percent of Ni, 0.0010 to 0.0050 percent of Ca, 0.01 to 0.05 percent of Alt, not more than 0.012 percent of N and the balance of Fe and inevitable impurities. A manufacturing method of the steel for the low-steel-grade continuous oil pipe comprises the following steps: smelting, casting, plate blank reheating, controlled rolling, controlled cooling and coiling, wherein the reheating temperature of a plate blank is 1150 to 1250 DEG C; the heat preservation time of the plate blank is 1.2 to 1.7min/mm (calculated by the thickness of the plate blank); the finish rolling temperature control range of the controlled rolling is 780 to 880 DEG C; the cooling speed in the controlled cooling is 2 to 18 DEG C/s; and the coiling temperature control range is 550 to 700 DEG C.
Description
Technical Field
The present invention relates to a steel for coiled tubing, particularly to a steel for low-grade coiled tubing suitable for the field of oil field operations such as well drilling, well logging, well completion, etc., and a manufacturing method thereof. Low grade means that the yield strength of the steel grade is between 50Ksi and 70 Ksi.
Background
Coiled Tubing (CT) is referred to as conventional threaded connection Tubing and is also known as Coiled Tubing, Coiled Tubing or Coiled Tubing. The long oil pipe is wound on a roller and can be continuously put into or taken out of an oil well without thread connection. The materials for the coiled tubing mainly comprise carbon steel, quenched and tempered steel, rare materials and the like, wherein the rare materials such as titanium alloy have the advantages of light weight, high strength and the like, but the price is high and is 6 times that of the common steel coiled tubing.
Over 40 years of development since the world's 1 st coiled tubing machine was introduced and started to be used in the oil industry in 1962, coiled tubing operations have now become a hot spot in the technological research and application of the world oil and gas industry. In foreign countries, coiled tubing technology is mainly used as a channel for transporting fluids, and is basically used for well flushing, matrix acidizing and nitrogen gas lifting, and accounts for 77% of the service income of the coiled tubing in 2001. At present, the coiled tubing technology is expanded to the fields of well drilling, well repairing, well logging, perforation, production increasing measures and the like. Coiled tubing workover has represented the development direction of the current worldwide workover technology and will be popularized worldwide as a conventional and efficient operation technology. At present, the maximum drilling depth of the coiled tubing exceeds 6900m, the outer diameter of the coiled tubing is developed to 168.27mm from the initial 33.4mm, and the application of the coiled tubing in the drilling field is further expanded along with the development of the coiled tubing technology. It can be said that the world oil industry is undergoing a coiled tubing technology revolution.
With the continuous progress and development of coiled tubing technology, the use of coiled tubing has been expanded to various fields of the oil industry, especially in recent years in the field of drilling and oil transportation. The introduction and utilization of coiled tubing technology in China began in the 70 s, and in 1977, the 1 st product of Bowen oil tools (Bonn tool Co.) was introduced in China, but for a long time, the coiled tubing operation technology has not been widely applied and popularized due to the blockade of foreign manufacturing and use technologies. Until 2000 years later, coiled tubing operation technology is rapidly developed abroad, attention of various domestic oil fields is attracted, the introduction of domestic coiled tubing operation equipment and the pace of technical innovation are accelerated, 43 coiled tubing operation equipment are introduced nationwide by 2008, and the annual growth rate is 14%. In addition, domestic Baoji Petroleum Steel tube company is building a coiled tubing production line, which is the third coiled tubing production line in the first world in Asia, and the design annual output is 1.5 ten thousand tons. In view of the increasing domestic demand and the continuous innovation of technology, the usage amount of the coiled tubing will rise greatly, and the development of raw materials for the domestic coiled tubing is urgent.
Steel for a coiled tubing and a method for manufacturing the same have also been described in the prior art, and chinese patent application No. 200710168545.3, for example, discloses a steel for a high-plasticity coiled tubing and a method for manufacturing the same. The technology produces the steel for the continuous oil pipe with moderate obdurability and uniform structure through the control of a steel-making process and a controlled rolling air cooling process, and the steel has small deformation resistance and small loss to a rolling mill in the rolling process. However, the technique of this document is mainly directed to the development of steel for continuous oil pipe of CT70 grade and higher.
The invention mainly aims at the steel for the continuous oil pipe with the steel grade below CT 70.
Disclosure of Invention
An object of the present invention is to provide a steel strip for a low-grade coiled tubing having good plasticity and toughness.
The term "low grade" in the present invention means that the yield strength of the steel grade is between 50Ksi and 70 Ksi.
Therefore, the high-strength low-alloy steel produced by adopting the low-C, high-Cr and alloying component design and matching with the controlled rolling and controlled cooling process has pearlite, ferrite and bainite tissues, has yield strength of 50-70 Ksi, simultaneously has good plasticity and is easier to realize the manufacturability.
In order to achieve the purpose, the steel for the low-steel-grade continuous oil pipe comprises the following chemical components (in percentage by weight): 0.03-0.17%, Si: 0.10 to 0.60%, Mn: 0.40-1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Cr: 0.51 to 1.00%, Ti: 0.01 to 0.10%, Mo: 0.05 to 0.35%, Cu: 0.10-0.50%, Ni is less than or equal to 0.15%, Ca: 0.0010-0.0050%, Alt: 0.01-0.05%, N is less than or equal to 0.012%, and the balance is Fe and inevitable impurities.
The design of the components of the invention is based on the following:
c, carbon C: the most basic strengthening elements. Carbon dissolves in steel to form interstitial solid solution, which acts as solid solution strengthening, and forms carbide precipitates with strong carbide-forming elements, which acts as precipitation strengthening. However, too high C is detrimental to the ductility, toughness and weldability of the steel, and too low C reduces the strength of the steel. Therefore, C is controlled to be 0.03-0.17%.
Silicon Si: the strength of the steel is mainly improved in a solid solution strengthening mode, and the steel is also used as a deoxidizing element in the steel, but the welding performance of the steel is deteriorated due to the fact that the content of the deoxidizing element is too high, so that the content of the deoxidizing element is controlled to be 0.10-0.60%.
Manganese Mn: the improvement of the strength of steel by solid solution strengthening is the most important and economical strengthening element in steel to compensate for the strength loss caused by the decrease of C content. Mn is also an element for expanding a gamma phase region, can reduce the gamma → alpha phase transition temperature of steel, is beneficial to obtaining a fine phase transition product, and can improve the toughness of the steel. The Mn content of the steel grade is 0.40-1.60%.
Chromium Cr: the important element for improving the hardenability of the steel effectively improves the strength of the steel, and when the Cr content is more than 0.51 percent, the corrosion resistance of the steel can be effectively improved; however, the addition of too high chromium and manganese to the steel at the same time results in the formation of low melting point Cr-Mn complex oxides, surface cracks during hot working, and severe deterioration of weldability. In the present invention, the Cr content should be limited to 0.51 to 1.00%.
Titanium Ti: the Ti undissolved carbonitride is a strong carbonitride forming element, the growth of austenite grains can be prevented when the steel is heated, and the growth of the austenite grains can be effectively inhibited by the TiN and TiC separated out during the rough rolling of the high-temperature austenite area. In addition, in the welding process, TiN and TiC particles in the steel can obviously prevent the crystal grains in the heat affected zone from growing, so that the welding performance of the steel plate is improved, and the impact toughness of the welding heat affected zone is obviously improved. The Ti content of the invention is controlled between 0.01 percent and 0.10 percent.
Molybdenum Mo: the element for improving hardenability is second to Mn, and Mo also has the functions of overcoming the temper brittleness in the heat treatment process and improving the heat treatment performance and the fatigue performance. In high strength low alloy steels, the yield strength increases with increasing Mo content, so too high Mo impairs plasticity. The content of Mo in the invention is controlled to be 0.05-0.35%.
Sulfur, phosphorus (S, P): is an inevitable impurity element in steel, and the lower the content, the better. The inclusion morphology control of the sulfide is carried out by ultra-low sulfur (less than 50ppm) and Ca treatment, thus ensuring that the steel plate has good impact toughness.
Copper, nickel (Cu, Ni): the strength of the steel can be improved through the solid solution strengthening effect, meanwhile, the corrosion resistance of the steel can be improved through Cu, the hot brittleness easily caused by Cu in the steel is mainly improved through the addition of Ni, and the toughness is beneficial. The Cu and Ni contents are respectively controlled to be 0.10-0.50% and less than or equal to 0.15%.
The form of sulfide inclusions can be controlled by Ca treatment, the anisotropy of the steel plate is improved, and the low-temperature toughness is improved. The content of Ca in the invention is controlled to be 0.0010-0.0050%.
Alt is an element added into steel for deoxidation, and the addition of a proper amount of Alt is beneficial to refining grains and improving the toughness of steel. The invention is controlled to be 0.01-0.05%.
Therefore, based on material strengthening theories such as grain refinement, solid solution strengthening, precipitation strengthening, and the like, a steel for a low-grade continuous oil pipe having a ferrite + pearlite microstructure is designed using a composition in which a relatively low carbon content, high Cr, and low S are alloyed with Cu, Ni, Cr, and Mo. The hot rolling process adopts a thermomechanical treatment technology of controlled rolling and controlled cooling, and controls the structure performance of a final product through reasonable components and processes so as to obtain a structure with proper strength and good plasticity.
Another object of the present invention is to provide a method for manufacturing a steel for a low-grade coiled tubing, the method comprising: smelting → casting → slab reheating → controlled rolling → controlled cooling → coiling.
Wherein, the smelting adopts the conventional pure steel smelting method known in the field, such as electric furnace smelting and external refining, converter smelting and external refining. However, the method is not limited thereto, and other suitable smelting methods may be selected as needed.
Casting is carried out by casting methods known in the art, such as continuous casting or die casting, preferably continuous casting.
In the invention, the reheating temperature of the plate blank is controlled to be 1150-1250 ℃, preferably 1180-1220 ℃, and the heat preservation in the temperature range can ensure that alloy elements are fully dissolved and the grain size does not grow abnormally;
slab heat preservation time: for the continuous casting plate blank (190-250 mm) with the conventional thickness, the time is generally 250-350 min; or according to the thickness of the plate blank, calculating according to the heat preservation coefficient of 1.2-1.7 min/mm; the temperature is kept within the time range, so that the temperature in the thickness direction of the plate blank can be ensured to be uniform, and the size of crystal grains cannot grow abnormally;
in the controlled rolling of the invention, the control range of the finish rolling temperature is as follows: 780-880 ℃, preferably 800-850 ℃, and rolling is controlled within the temperature range, so that grains are favorably refined, and the toughness is improved;
the coiling temperature control range in the invention is as follows: coiling at 550-700 ℃, preferably 560-650 ℃, within the temperature range, so as to be beneficial to refining grains and avoid the occurrence of coarse pearlite ferrite tissues;
the cooling speed in the control cooling of the invention is as follows: 2-18 ℃/s, preferably 5-15 ℃/s, and the steel is cooled within the cooling speed range, so that the tissue refinement is promoted, the generation of hard phase tissues is avoided, and the toughness and the plasticity of the steel are improved.
Compared with the prior produced steel, the steel for the coiled tubing produced according to the invention has the following properties:
(1) yield strength (R)t0.5)：≥345MPa；
(2) Tensile strength (Rm): not less than 450 MPa;
(3) elongation (A)50.8％)：≥15％；
(4) Hardness value (HRC): less than or equal to 22.
Detailed Description
The chemical compositions of the examples were designed according to the chemical composition requirements of the steels of the present invention, as shown in table 2.
The main rolling process parameters of example 1 and example 4 are as follows according to the process requirements of the present invention: a. heating temperature of the plate blank: 1180 +/-15 ℃; b. and (3) heat preservation time: 300 min; c. the control range of the finishing temperature is as follows: 810 +/-10 ℃; d. coiling temperature control range: 600-650 ℃; e. cooling rate: 8-15 ℃/s;
according to the process requirements of the invention, the main rolling process parameters of the above examples 2 and 3 are as follows: a. heating temperature of the plate blank: 1220 plus or minus 10 ℃; b. and (3) heat preservation time: 260 min; c. the control range of the finishing temperature is as follows: 840 +/-10 ℃; d. coiling temperature control range: 550-600 ℃; e. cooling rate: 10-18 ℃/s;
according to the process requirements of the invention, the main rolling process parameters of the above examples 5 and 6 are as follows: a. heating temperature of the plate blank: 1160 +/-10 ℃; b. and (3) heat preservation time: 340 min; c. the control range of the finishing temperature is as follows: 790 +/-10 ℃; d. coiling temperature control range: 650-680 ℃; e. cooling rate: 2-10 ℃/s;
the mechanical properties obtained in examples 1 to 6 according to the above composition and process design are shown in Table 3.
Therefore, the steel strip manufactured according to the components and the process designed by the invention has good comprehensive mechanical properties, meets the requirements of various performance indexes of the steel for the low-steel-grade continuous oil pipe, has low carbon equivalent and is beneficial to welding. In addition, the invention has simple components and wider process window, and is easier to implement on site.
The 200710168545.3 technique in the prior art mainly aims at the development of the steel for the continuous oil pipe with higher steel grade than CT70, and produces the steel for the continuous oil pipe with moderate obdurability and uniform structure through the control of the steel-making process and the controlled rolling and controlled cooling process. The invention mainly aims at the steel for the continuous oil pipe with the steel grade below CT70, and mainly realizes the functions of solid solution strengthening and precipitation strengthening by adding alloy elements such as Cu, Ni, Cr, Mo and the like, thereby ensuring the obdurability of the material after heat treatment. Micro-alloy element Nb is not added, a small amount of Ti is added to fix steel N, original austenite grains are refined, and the performance of a heat affected zone is improved; meanwhile, the free N content of the steel grade is reduced, and the toughness of the steel grade is improved.
The steel produced by the invention is suitable for coiled tubing used in the oil field operation fields of drilling, logging, well completion and the like.
The present invention has been described in detail with reference to the specific embodiments, but the present invention is not limited to the embodiments, and other embodiments with variations or improvements may be made without departing from the spirit of the present invention, and the variations and improvements are within the scope of the present invention.
Claims (6)
1. The steel for the low-steel-grade continuous oil pipe comprises the following chemical components in percentage by weight: c: 0.03-0.17%, Si: 0.10 to 0.60%, Mn: 0.40-1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Cr: 0.51 to 1.00%, Ti: 0.01 to 0.10%, Mo: 0.05 to 0.35%, Cu: 0.10-0.50%, Ni is less than or equal to 0.15%, Ca: 0.0010-0.0050%, Alt: 0.01-0.05%, N is less than or equal to 0.012%, and the balance is Fe and inevitable impurities.
2. The method for manufacturing steel for a low-steel-grade coiled tubing according to claim 1, comprising:
smelting → casting → slab reheating → controlled rolling → controlled cooling → coiling;
wherein,
the reheating temperature of the plate blank is 1150-1250 ℃;
slab heat preservation time: according to the thickness of the plate blank, calculating according to the heat preservation coefficient of 1.2-1.7 min/mm to obtain the heat preservation coefficient;
in controlled rolling, the control range of the finish rolling temperature is as follows: 780-880 ℃;
controlling the cooling speed in cooling: 2-18 ℃/s;
coiling temperature control range: 550-700 ℃.
3. The method for producing steel for a low-grade coiled tubing according to claim 2, wherein the cooling rate during cooling is controlled to be 5 to 15 ℃/s.
4. The method of producing steel for a low-grade coiled tubing according to claim 2 or 3, wherein the smelting is converter smelting + external refining or electric furnace smelting + external refining.
5. The method for producing steel for a low-grade continuous oil pipe according to any one of claims 2 to 4, wherein the casting is continuous casting.
6. The method for producing steel for a low-grade continuous oil pipe according to any one of claims 2 to 5, wherein the slab heat-retaining time is 250 to 350min for a continuous cast slab having a thickness of 190 to 259 mm.
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| CN2009100499860A CN101871081B (en) | 2009-04-24 | 2009-04-24 | Steel for low-steel-grade continuous oil pipe and manufacturing method thereof |
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| CN2009100499860A CN101871081B (en) | 2009-04-24 | 2009-04-24 | Steel for low-steel-grade continuous oil pipe and manufacturing method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103075111A (en) * | 2012-07-13 | 2013-05-01 | 宝鸡石油钢管有限责任公司 | Coiled tubing with different strength sections and manufacturing method thereof |
| CN104815851A (en) * | 2014-12-24 | 2015-08-05 | 北京首钢股份有限公司 | Method for controlling heating of plate blank |
| CN105779897A (en) * | 2014-12-23 | 2016-07-20 | 鞍钢股份有限公司 | M65-grade resistance welding petroleum casing pipe and manufacturing method thereof |
| CN107815594A (en) * | 2017-11-12 | 2018-03-20 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of cold extrusion gear wire rod |
| CN109722611A (en) * | 2017-10-27 | 2019-05-07 | 宝山钢铁股份有限公司 | A kind of low yield strength ratio superhigh intensity coiled tubing steel and its manufacturing method |
| CN113637925A (en) * | 2020-04-27 | 2021-11-12 | 宝山钢铁股份有限公司 | Steel for quenched and tempered continuous oil pipe, hot-rolled steel strip, steel pipe and manufacturing method thereof |
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2009
- 2009-04-24 CN CN2009100499860A patent/CN101871081B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103075111A (en) * | 2012-07-13 | 2013-05-01 | 宝鸡石油钢管有限责任公司 | Coiled tubing with different strength sections and manufacturing method thereof |
| CN103075111B (en) * | 2012-07-13 | 2015-04-22 | 宝鸡石油钢管有限责任公司 | Coiled tubing with different strength sections and manufacturing method thereof |
| CN105779897A (en) * | 2014-12-23 | 2016-07-20 | 鞍钢股份有限公司 | M65-grade resistance welding petroleum casing pipe and manufacturing method thereof |
| CN104815851A (en) * | 2014-12-24 | 2015-08-05 | 北京首钢股份有限公司 | Method for controlling heating of plate blank |
| CN109722611A (en) * | 2017-10-27 | 2019-05-07 | 宝山钢铁股份有限公司 | A kind of low yield strength ratio superhigh intensity coiled tubing steel and its manufacturing method |
| CN109722611B (en) * | 2017-10-27 | 2020-08-25 | 宝山钢铁股份有限公司 | Steel for low-yield-ratio ultrahigh-strength continuous oil pipe and manufacturing method thereof |
| US11396680B2 (en) | 2017-10-27 | 2022-07-26 | Baoshan Iron & Steel Co., Ltd. | Steel for coiled tubing with low yield ratio and ultra-high strength and preparation method thereof |
| CN107815594A (en) * | 2017-11-12 | 2018-03-20 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of cold extrusion gear wire rod |
| CN113637925A (en) * | 2020-04-27 | 2021-11-12 | 宝山钢铁股份有限公司 | Steel for quenched and tempered continuous oil pipe, hot-rolled steel strip, steel pipe and manufacturing method thereof |
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