CN109554625B - Hot-rolled steel strip for continuous pipe with yield strength of 800-1000 MPa and manufacturing method thereof - Google Patents
Hot-rolled steel strip for continuous pipe with yield strength of 800-1000 MPa and manufacturing method thereof Download PDFInfo
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention discloses a hot rolled steel strip for a continuous pipe with yield strength of 800-1000 MPa and a manufacturing method thereof, wherein the hot rolled steel strip comprises the following chemical components in percentage by weight: c: 0.10 to 0.16%, Mn: 1.00-2.00%, Cr: 0.60 to 1.00%, Mo: 0.20 to 0.60%, Si: 0.15 to 0.40%, Cu: 0-0.40%, Ni: 0-0.35%, Nb: 0.030-0.070%, Ti: 0.010-0.030%, V is less than or equal to 0.040%, Al: 0.015 to 0.050%, Ca: 0.0008-0.0025%, P is less than or equal to 0.012%, S is less than or equal to 0.0015%, N is less than or equal to 0.0045%, and O is less than or equal to 0.0020%, and the invention meets the requirements of 8000m ultra-deep wells and ultra-high pressure service environments with the pressure of more than 100MPa on strength, toughness and plasticity.
Description
Technical Field
The invention relates to a hot rolled steel strip for a low-alloy ultrahigh-strength continuous oil pipe and a production method thereof, in particular to a hot rolled steel strip for a continuous pipe with yield strength of 800-1000 MPa and a manufacturing method thereof.
Background
The coiled tubing is a tubing for high-end oil and gas exploitation operation, the flexible steel tube with the length of thousands of meters to more than ten thousand meters is coiled on the tube coil, the coiled tubing is opened from the tube coil during operation, and the coiled tubing is coiled on the tube coil again after the operation is finished and can be used repeatedly. Compared with the traditional oil well pipe, the coiled tubing operation is more flexible, has the advantages of operation under pressure, continuous lifting, small equipment volume, quick operation period and low cost, and particularly has outstanding advantages in shale gas exploitation application. Due to the ultra-high pressure operation environment of the ultra-deep well in shale gas development, the ultra-high strength coiled tubing with excellent performance needs to be developed.
The existing hot rolled steel strips for coiled tubing are all in the grade of CT110 or below (yield strength is less than 800MPa), and cannot meet the requirements of 8000m ultra-deep wells and 100MPa ultra-high pressure operation due to insufficient strength, such as patent application numbers of 200710168545.3, 200810040895.6, 201611162208.9, 201711325095.4 and 201711324677.0.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a hot rolled steel strip for a continuous pipe with the yield strength of 800-1000 MPa and a manufacturing method thereof, wherein the hot rolled steel strip is excellent in plasticity, toughness, fatigue property and welding property, and has the yield strength of 800-1000 MPa, the tensile strength of 900-1150 MPa and the elongation A50mm13-20%, the Charpy impact at-20 ℃ is more than or equal to 100J, and the method can be used for manufacturing ultra-deep well coiled tubing with the operation depth of 8000m or ultra-high pressure coiled tubing with the operation pressure of 100 MPa.
In order to achieve the purpose, the invention provides a hot-rolled steel strip for a continuous pipe with yield strength of 800-1000 MPa, which comprises the following chemical components in percentage by weight: c: 0.10 to 0.16%, Mn: 1.00-2.00%, Cr: 0.60 to 1.00%, Mo: 0.20 to 0.60%, Si: 0.15 to 0.40%, Cu: 0-0.40%, Ni: 0-0.35%, Nb: 0.030-0.070%, Ti: 0.010-0.030%, V is less than or equal to 0.040%, Al: 0.015 to 0.050%, Ca: 0.0008 to 0.0025 percent, less than or equal to 0.012 percent of P, less than or equal to 0.0015 percent of S, less than or equal to 0.0045 percent of N, less than or equal to 0.0020 percent of O, and the balance of Fe and inevitable impurities; and the elements simultaneously need to satisfy the following two characteristics:
a.3.5C+3.5Mo+Mn+Cr：3.3～5.3％，
Ni/Cu is not less than 2/3; the addition of Cu can improve the corrosion resistance of the hot rolled steel strip;
c.Mn/Si：5～10。
further, the chemical components of the hot-rolled steel strip comprise the following components in percentage by weight: c: 0.10 to 0.14%, Mn: 1.20-1.60%, Cr: 0.60 to 1.00%, Mo: 0.20 to 0.60%, Si: 0.15 to 0.40%, Cu: 0-0.40%, Ni: 0-0.35%, Nb: 0.030 to 0.060%, Ti: 0.010-0.030%, Al: 0.015 to 0.050%, Ca: 0.0008 to 0.0025 percent, less than or equal to 0.012 percent of P, less than or equal to 0.0015 percent of S, less than or equal to 0.0045 percent of N, less than or equal to 0.0015 percent of O, and the balance of Fe and inevitable impurities;
and the elements simultaneously need to satisfy the following two characteristics:
a.3.5C+3.5Mo+Mn+Cr：3.3～5.3％，
b.Ni/Cu≥2/3，
c.Mn/Si：5～10。
still further, the hot rolled steel strip comprises the following chemical components in percentage by weight: c: 0.10 to 0.13%, Mn: 1.20-1.60%, Cr: 0.75 to 1.00%, Mo: 0.20 to 0.60%, Si: 0.15 to 0.40%, Cu: 0.25 to 0.40%, Ni: 0.20 to 0.30%, Nb: 0.030 to 0.050%, Ti: 0.020 to 0.030%, Al: 0.015 to 0.050%, Ca: 0.0008 to 0.0025 percent, less than or equal to 0.012 percent of P, less than or equal to 0.0015 percent of S, less than or equal to 0.0045 percent of N, less than or equal to 0.0015 percent of O, and the balance of Fe and inevitable impurities; and the elements simultaneously need to satisfy the following two characteristics:
a.3.5C+3.5Mo+Mn+Cr：4.0～5.0％，
b.Ni/Cu≥2/3，
c.Mn/Si：5～10。
still further, the hot rolled steel strip comprises the following chemical components in percentage by weight: c: 0.107%, Mn: 1.44%, Cr: 0.93%, Mo: 0.58%, Si: 0.28%, Cu: 0.37%, Ni: 0.25%, Nb: 0.045%, Ti: 0.025%, Al: 0.0405%, Ca: 0.0008%, P: 0.008%, S: 0.0005%, N: 0.0040 percent, less than or equal to 0.0015 percent of O, and the balance of Fe and inevitable impurities; and the elements simultaneously need to satisfy the following two characteristics:
a.3.5C+3.5Mo+Mn+Cr：4.8％，
b.Ni/Cu≥2/3，
c.Mn/Si：5.15。
still further, the hot rolled steel strip comprises the following chemical components in percentage by weight: c: 0.120%, Mn: 1.50%, Cr: 0.88%, Mo: 0.47%, Si: 0.16%, Cu: 0.34%, Ni: 0.23%, Nb: 0.031%, Ti: 0.027%, Al: 0.0391%, Ca: 0.0008%, P: 0.008%, S: 0.0011%, N: 0.0024 percent, less than or equal to 0.0015 percent of O, and the balance of Fe and inevitable impurities; and the elements simultaneously need to satisfy the following two characteristics:
a.3.5C+3.5Mo+Mn+Cr：4.45％，
b.Ni/Cu≥2/3，
c.Mn/Si：9.50。
further, the yield strength, the tensile strength and the elongation percentage A of the hot-rolled steel strip are respectively 800-1000 MPa, 900-1150 MPa and A50mm13-20% and-20 ℃ Charpy impact is 100-160J.
The invention also provides a manufacturing method of the hot rolled steel strip for the continuous pipe with the yield strength of 800-1000 MPa, the hot rolled steel strip is prepared by continuous casting blank, slab heating and controlled cooling after being processed by a converter, an argon station, a ladle furnace, a vacuum furnace and calcium, and is characterized in that:
1) in the slab heating process, heating the slab to 1250-1300 ℃, then carrying out heat preservation and soaking, then rolling, finishing rough rolling at 1050-1120 ℃, and finishing finish rolling at 830-940 ℃;
2) in the controlled cooling process, the temperature is cooled to 420-600 ℃ at 50-100 ℃/s, and the final cooling temperature is required to meet the requirements of 420+250[ C% ] +20([ Mn% ] + [ Cr% ]) +60[ Mo% ]; then air-cooling to 400-500 ℃ and coiling.
The mechanism of action of the various elements in the present invention is as follows:
carbon (C): the most economical strengthening element improves the strength of the steel through interstitial solid solution strengthening. The carbon content is increased, the hardenability of the steel can be greatly improved, the addition of other noble alloys is reduced, the production cost is reduced, and meanwhile, the yield ratio of the steel is reduced, so that the C content is not low. However, the higher the carbon content is, the more adverse to the low temperature toughness of the steel, and meanwhile, the more serious hard phase segregation zone is easily formed in the steel grade, which aggravates the structural nonuniformity of the steel and is not favorable for the fatigue performance of the product, so the carbon content also cannot be too high. The amount of carbon added is preferably 0.12 to 0.16%.
Manganese (Mn): the more economic alloying element effectively improves the hardenability of the steel and can obviously improve the yield and tensile strength of the steel. However, when the manganese content is high, if the process is not proper, serious structure segregation is easy to generate, and the steel has uneven components and structures. The addition amount of manganese is 1.00-2.00%, and the preferable addition amount of manganese is 1.20-1.60%.
Chromium (Cr): effectively improves the hardenability of the steel and has certain solid solution strengthening effect. Chromium can form a compact protective layer on the surface of steel in a corrosive environment, so that the effect of protecting a matrix is achieved, and the corrosion resistance of the steel is effectively improved. However, when the chromium content in the steel is too high, the welding quality of high-frequency resistance welding is not facilitated, the gray spot defect is easy to form, welding protection is required, and the welding difficulty and the welding cost are increased. The addition amount of chromium in the easily weldable hot rolled steel strip is preferably 0.60-1.00%.
Molybdenum (Mo): the element with strong hardenability remarkably delays the ferrite phase change, inhibits the formation of ferrite and pearlite, enables the steel to obtain a bainite structure in a wider cooling rate range after rolling, and meanwhile, the addition of molybdenum does not remarkably increase the segregation in the steel. The addition amount of the molybdenum is 0.20-0.60%.
Carbon, molybdenum, manganese, chromium element combination (3.5C +3.5Mo + Mn + Cr): C. mo, Mn, and Cr are all elements that promote good solid solution strengthening and structure strengthening, but the main strengthening action and the degree of influence on the structure of each element are significantly different, and the influence on toughness and plasticity is also different. The requirements of strength, plasticity and toughness of the product are integrated, when the ratio of 3.3% to 3.5C +3.5Mo + Mn + Cr is less than or equal to 5.3%, the method is beneficial to obtaining a lath bainite structure with a lath spacing of 250-400 nm, ensures the toughness and plasticity of steel while ensuring the required strength, and can avoid the formation of massive martensite which is a large-size brittle hard phase.
Silicon (Si): the silicon-based alloy mainly plays a role in solid solution strengthening and is beneficial to improving the fatigue performance of steel, but when the content is too high, the surface quality and the high-frequency welding quality are not facilitated, the more suitable addition amount of silicon is 0.15-0.40%, and the preferable addition amount of silicon is to ensure that Mn/Si is more than or equal to 5.
Copper, nickel (Cu, Ni): copper mainly plays a role in improving the corrosion resistance and weather resistance of steel, nickel can improve the hot brittleness caused by adding copper, but the adding amount of the nickel is more than 2/3 of the copper content; the copper-nickel alloy can be selectively added according to the service environment of the material, and the preferable addition amount of the copper is 0.25-0.35%, and the addition amount of the nickel is 0.17-0.24%. Niobium, titanium (Nb, Ti): the microalloying elements can obviously refine grains and play a role in precipitation strengthening, can obviously improve the austenite recrystallization temperature of the steel, enlarge the range of a non-recrystallization region, facilitate the realization of high-temperature controlled rolling and reduce the load of a rolling mill. The addition amounts of niobium and titanium are preferably 0.030 to 0.060% and 0.010 to 0.030%, respectively.
Vanadium (V): the tensile strength of the thin steel strip can be effectively improved, but the toughness of the steel can be obviously reduced. The addition amount of the vanadium is 0-0.040%, and when the requirement on the toughness of the steel strip is not high, 0.020-0.040% of the vanadium can be added; when high toughness is required, the addition of vanadium is avoided, and the content of vanadium is 0-0.010%.
Aluminum (Al): aluminum is a main deoxidizing element in steel, so that the oxygen content in the steel can be remarkably reduced, and meanwhile, the aluminum and nitrogen are combined to form AlN, so that crystal grains can be effectively refined. However, when the aluminum content in the steel exceeds 0.06%, the oxide inclusion of aluminum is easily increased obviously, the cleanliness of the steel is reduced, and the low-temperature toughness of the steel is unfavorable. The addition amounts of aluminum are preferably 0.015 to 0.050%, respectively.
Calcium (Ca): the steel is subjected to calcium treatment in the secondary refining process, so that the form of inclusions in the steel can be improved, and the impact toughness of the steel is improved, but excessive addition is easy to reduce the cleanliness of the steel, and is unfavorable for the low-temperature toughness of the steel. The addition amounts of calcium are preferably 0.0008 to 0.0025%, respectively.
Phosphorus, sulfur, nitrogen (P, S, N, O): phosphorus tends to cause cold embrittlement of the steel; sulfur tends to cause hot shortness; nitrogen easily causes quenching failure and deformation failure of steel, so that the performance of the steel is unstable, large-particle TiN is easily generated, the toughness is reduced, and the fatigue resistance of the material is reduced; the higher the oxygen content, the higher the inclusion content in the steel, and the poorer the fatigue resistance of the steel; therefore, the contents of phosphorus, sulfur, nitrogen and oxygen in the steel should be reduced as much as possible.
Final cooling temperature: the final cooling temperature and alloy elements determine the structure composition proportion and the product performance of steel, the final cooling temperature is too high, a large amount of polygonal or quasi-polygonal ferrite is formed, and the strength is insufficient; the final cooling temperature is too low, a large amount of martensite or fine lath bainite is formed, the toughness and plasticity of the steel are poor, and the more suitable final cooling temperature is set to be 420-600 ℃. The suitable final cooling temperature varies depending on the contents of C, Mn, Cr and Mo in the steel, and is preferably set by calculation according to the formula 420+250[ C% ] +20([ Mn% ] + [ Cr% ]) +60[ Mo% ].
The invention has the beneficial effects that:
compared with the prior art, the method ensures that the toughness and plasticity of the steel are ensured while the solid solution strengthening effect and the structure strengthening effect required by the ultrahigh-strength hot-rolled steel strip are obtained through the combined alloy design and the combined final cooling process design based on the beneficial and harmful effects and different influence degrees of C, Mn, Cr and Mo, and meets the harsh requirements of 8000m ultra-deep wells and ultrahigh-pressure service environments of more than 100MPa on the strength, the toughness and the plasticity.
Detailed Description
In order to better explain the invention, the following further illustrate the main content of the invention in connection with specific examples, but the content of the invention is not limited to the following examples.
The hot rolled steel strip for the continuous pipe with the yield strength of 800-1000 MPa comprises the following chemical components in percentage by weight: c: 0.10 to 0.16%, Mn: 1.00-2.00%, Cr: 0.60 to 1.00%, Mo: 0.20 to 0.60%, Si: 0.15 to 0.40%, Cu: 0-0.40%, Ni: 0-0.35%, Nb: 0.030-0.070%, Ti: 0.010-0.030%, V is less than or equal to 0.040%, Al: 0.015 to 0.050%, Ca: 0.0008 to 0.0025 percent, less than or equal to 0.012 percent of P, less than or equal to 0.0015 percent of S, less than or equal to 0.0045 percent of N, less than or equal to 0.0020 percent of O, and the balance of Fe and inevitable impurities; and the elements simultaneously need to satisfy the following two characteristics:
a.3.5C+3.5Mo+Mn+Cr：3.3～5.3％，
b. however, Ni/Cu is not less than 2/3. The addition of Cu can improve the corrosion resistance of the hot rolled steel strip.
The manufacturing method of the hot rolled steel strip for the continuous pipe with the yield strength of 800-1000 MPa is characterized in that the hot rolled steel strip is prepared by continuous casting blank, slab heating and controlled cooling after being treated by a converter, an argon station, a ladle furnace, a vacuum furnace and calcium, wherein,
1) in the slab heating process, heating the slab to 1250-1300 ℃, then carrying out heat preservation and soaking, then rolling, finishing rough rolling at 1050-1120 ℃, and finishing finish rolling at 830-940 ℃;
2) in the controlled cooling process, the temperature is cooled to 420-600 ℃ at 50-100 ℃/s, and the final cooling temperature is required to meet the requirements of 420+250[ C% ] +20([ Mn% ] + [ Cr% ]) +60[ Mo% ]; then air-cooling to 400-500 ℃ and coiling.
The compositions, processes and properties of the following examples were designed according to the compositions and processes of the hot rolled steel strip as shown in tables 1 to 3.
As can be seen from tables 1 to 3, compared with the comparative example, the steel provided by the invention has good matching of strength, elongation and impact toughness, the yield strength reaches 802 to 991MPa, the tensile strength reaches 904 to 1146MPa, the elongation is 13.8 to 19.3 percent, and the impact strength is 109 to 157J; in the comparative example, either the strength was insufficient, the toughness was poor, or the plasticity was poor. Wherein, the embodiment 7 has good strong plasticity matching and better toughness and corrosion resistance; example 8 has good toughness matching and better plasticity and corrosion resistance.
The above examples are merely preferred examples and are not intended to limit the embodiments of the present invention.
TABLE 1 tabulated values of the ingredients (wt,%) for the inventive and comparative examples
TABLE 2 tabulation of main process parameters (. degree. C.) for each example of the invention and comparative example
TABLE 3 statistical tables for the main performance tests of the examples and comparative examples of the present invention
| Serial number | Yield (MPa) | Tensile strength (MPa) | Elongation (%) | Charpy impact at-20 ℃ (J) |
| 1 | 935 | 1050 | 17 | 157 |
| 2 | 863 | 911 | 18.2 | 144 |
| 3 | 902 | 1008 | 16.5 | 132 |
| 4 | 879 | 1014 | 19.3 | 116 |
| 5 | 802 | 904 | 15.7 | 154 |
| 6 | 833 | 924 | 16.4 | 129 |
| 7 | 991 | 1146 | 17.8 | 109 |
| 8 | 958 | 1105 | 14.3 | 157 |
| 9 | 915 | 940 | 13.8 | 144 |
| Comparative example 1 | 748 | 989 | 19.1 | 62 |
| Comparative example 2 | 810 | 945 | 14.3 | 87 |
| Comparative example 3 | 1104 | 1198 | 11.4 | 48 |
Other parts not described in detail are prior art. Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.
Claims (3)
1. A hot rolled steel strip for a continuous pipe with yield strength of 800-1000 MPa is characterized in that: the hot rolled steel strip comprises the following chemical components in percentage by weight: c: 0.10 to 0.13%, Mn: 1.20-1.60%, Cr: 0.75 to 1.00%, Mo: 0.20 to 0.60%, Si: 0.15 to 0.40%, Cu: 0.25 to 0.40%, Ni: 0.20 to 0.30%, Nb: 0.030 to 0.050%, Ti: 0.020 to 0.030%, Al: 0.015 to 0.050%, Ca: 0.0008 to 0.0025 percent, less than or equal to 0.012 percent of P, less than or equal to 0.0015 percent of S, less than or equal to 0.0045 percent of N, less than or equal to 0.0015 percent of O, and the balance of Fe and inevitable impurities; and the elements simultaneously need to satisfy the following two characteristics:
a.3.5C+3.5Mo+Mn+Cr：4.0～5.0％，
b.Ni/Cu≥2/3，
Mn/Si: 5-10; the yield strength of the hot-rolled steel strip is 800-1000 MPa, the tensile strength is 900-1150 MPa, and the elongation rate A is50mm13-20%, and the Charpy impact at-20 ℃ is 100-160J; the hot rolled steel strip for the continuous pipe with the yield strength of 800-1000 MPa is prepared by continuous casting blank forming, slab heating and controlled cooling after being processed by a converter, an argon station, a ladle furnace, a vacuum furnace and calcium, wherein,
1) in the slab heating process, heating the slab to 1250-1300 ℃, then carrying out heat preservation and soaking, then rolling, finishing rough rolling at 1050-1120 ℃, and finishing finish rolling at 830-940 ℃;
2) in the controlled cooling process, the temperature is cooled to 420-600 ℃ at 50-100 ℃/s, and the final cooling temperature is required to meet the requirements of 420+250[ C% ] +20([ Mn% ] + [ Cr% ]) +60[ Mo% ]; then air-cooling to 400-500 ℃ and coiling.
2. The hot-rolled steel strip for a continuous pipe with a yield strength of 800 to 1000MPa according to claim 1, wherein: the hot rolled steel strip comprises the following chemical components in percentage by weight: c: 0.107%, Mn: 1.44%, Cr: 0.93%, Mo: 0.58%, Si: 0.28%, Cu: 0.37%, Ni: 0.25%, Nb: 0.045%, Ti: 0.025%, Al: 0.0405%, Ca: 0.0008%, P: 0.008%, S: 0.0005%, N: 0.0040 percent, less than or equal to 0.0015 percent of O, and the balance of Fe and inevitable impurities; and the elements simultaneously need to satisfy the following two characteristics:
a.3.5C+3.5Mo+Mn+Cr：4.8％，
b.Ni/Cu≥2/3，
c.Mn/Si：5.15。
3. the hot-rolled steel strip for a continuous pipe with a yield strength of 800 to 1000MPa according to claim 1, wherein: the hot rolled steel strip comprises the following chemical components in percentage by weight:
c: 0.120%, Mn: 1.50%, Cr: 0.88%, Mo: 0.47%, Si: 0.16%, Cu: 0.34%, Ni: 0.23%, Nb: 0.031%, Ti: 0.027%, Al: 0.0391%, Ca: 0.0008%, P: 0.008%, S: 0.0011%, N: 0.0024 percent, less than or equal to 0.0015 percent of O, and the balance of Fe and inevitable impurities; and the elements simultaneously need to satisfy the following two characteristics:
a.3.5C+3.5Mo+Mn+Cr：4.45％，
b.Ni/Cu≥2/3，
c.Mn/Si：9.50。
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