CN111607750A - X90-grade high-strength pipeline steel plate coil with thickness of more than or equal to 20mm and manufacturing method thereof - Google Patents
X90-grade high-strength pipeline steel plate coil with thickness of more than or equal to 20mm and manufacturing method thereof Download PDFInfo
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- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- 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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- 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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- C21D2211/00—Microstructure comprising significant phases
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- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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Abstract
The invention discloses an X90-grade high-strength pipeline steel plate coil with the thickness of more than or equal to 20mm, which comprises C, Si, Mn, P, S, Cu, Ni, Cr, Mo, Nb, V, Ti, N, Al, Ca and B, and the balance of Fe and inevitable impurities; pcm: 0.163 to 0.19 percent, Mn + Cr +3 Mo: 2.65 to 2.85 percent. A manufacturing method of an X90-grade high-strength pipeline steel plate coil with the thickness of more than or equal to 20mm comprises the following process flows: smelting, casting blank heating, controlled rolling and controlled cooling. Can meet the requirement of more than or equal to 400 hundred million m3The construction requirement of the oil and gas transmission pipeline is met, the-20 ℃ CVN is more than or equal to 305J, the-15 ℃ DWTT is more than or equal to 85%, and the uniform elongation Agt is more than or equal to 5%.
Description
Technical Field
The invention relates to the field of hot-rolled pipeline steel, in particular to an X90-grade high-strength pipeline steel plate coil with the thickness of more than or equal to 20mm and a manufacturing method thereof.
Background
According to the national medium and long-term oil and gas pipe network planning, the petroleum consumption of China will continuously and steadily increase, and the demand potential of natural gas is huge. In order to guarantee the rapidly-increased energy demand and national energy safety, the imported natural gas conveying capacity needs to be enhanced, in the aspect of pipeline conveying capacity, the natural gas pipeline conveying capacity is in direct proportion to conveying pressure and in direct proportion to the 2.5 th power of the pipe diameter, and high-pressure and large-caliber conveying is the most basic method for improving conveying efficiency. The larger the pipe diameter is, the higher the conveying pressure is, the higher the bearing of the pipe wall is, and accordingly, pipeline steel with higher steel grade, larger wall thickness and good low-temperature toughness is needed.
Patent application No. 201310169449.6 discloses "steel for X90 pipeline and method for producing the same", wherein the steel is designed to contain B, and the addition of B significantly increases the lath bainite ratio, and the strength of the steel can be greatly improved, but the low-temperature toughness of the steel is poor, and in the disclosed examples, the low-temperature toughness is substantially 300J or less.
The patent application No. 201410266532.X discloses an X90 pipeline steel pipe with uniform deformation elongation UEL being more than or equal to 5% and a preparation method thereof. The patent comprises a production method of an X90 wide and thick steel plate, which is different from the hot continuous rolling plate coil related to the invention, and the two methods are different technical routes; meanwhile, the patent adopts a relatively high Cr + low Mo alloy design, and is not suitable for producing X90-grade hot continuous rolling coils.
Patent application No. 201410791739.9 discloses "X90 grade multiphase structure pipeline steel for straight welded pipe". Unlike the present invention, the patent contains a method for producing an X90 wide steel plate, which has a high C content and is not suitable for producing X90 grade high toughness coils; and the using thickness of the steel is below 16.3-19.6 mm, so that the steel cannot meet the construction requirement of pipeline steel with ultra-large transmission capacity.
The documents of patent application nos. 201410791739.9 and 201811023904.0 disclose "steel sheet for NbC nanoparticle-reinforced X90 plastic pipe and method for producing the same" and "steel sheet for VC nanoparticle-reinforced X90 plastic pipe and method for producing the same", respectively, that X90-grade line steel sheet is produced by precipitation strengthening, but the addition of high C (0.06% or more) to ensure good precipitation strengthening effect results leads to low toughness of the steel, and in both patent examples, the impact energy of the steel is 280J or less, and the requirement for low-temperature toughness of ultra-large output X90 line steel is not satisfied.
Disclosure of Invention
The invention aims to solve the technical problem of providing an X90-grade high-strength pipeline steel plate coil with the thickness of more than or equal to 20mm and a manufacturing method thereof, so as to overcome the defects in the prior art.
In order to solve the technical problem, the invention provides an X90-grade high-strength pipeline steel plate coil with the thickness of more than or equal to 20mm, which comprises the following components in percentage by mass:
c: 0.030 to 0.050%, Si: 0.10-0.30%, Mn: 1.60-1.90%, P is less than or equal to 0.012%, S is less than or equal to 0.0015%, Cu is less than or equal to 0.10%, Ni: 0.15-0.35%, Cr: 0.15% -0.30%, Mo: 0.20-0.30%, Nb: 0.060% -0.080%, V: 0.020-0.040%, Ti: 0.010-0.025%, N is less than or equal to 0.0050%, Al: 0.015 to 0.060%, Ca: 0.0008 to 0.0025 percent of the total weight of the alloy, less than or equal to 0.0004 percent of B, and the balance of Fe and inevitable impurities; pcm: 0.163 to 0.19 percent, Mn + Cr +3 Mo: 2.65 to 2.85 percent.
As an improvement of the above technical solution, C: 0.035-0.045%, Mn: 1.75-1.85%, Ni: 0.20-0.30%, Nb: 0.060% -0.070%.
As an improvement of the technical scheme, the structure in the pipeline steel plate coil is as follows: acicular ferrite, polygonal ferrite, granular bainite and martensite islands, which respectively account for the following ratio:
acicular ferrite: 80% -90%, polygonal ferrite: 3% -8%, granular bainite: 3-8% and martensite island is less than or equal to 4%.
A manufacturing method of an X90-grade high-strength pipeline steel plate coil with the thickness of more than or equal to 20mm comprises the following process flows: : smelting, casting blank heating, controlled rolling and controlled cooling;
heating a casting blank: the heating temperature is 1150-1200 ℃, the heat preservation time is 60-120 min, the refinement of austenite grains is avoided through low-temperature heating, the uniformity of the slab temperature is ensured through controlling the heat preservation time, and the growth and coarsening of the austenite grains are avoided;
controlling rolling: carrying out rough rolling for 6 times in total, rolling the billet with the thickness of 230mm to 60mm, wherein the relative reduction rate of the two times at the end of the rough rolling is more than or equal to 23 percent, the finishing temperature is 960-1000 ℃, the austenite grains are fully recrystallized by large deformation at lower temperature at the end of the two times at the end of the rough rolling, and the austenite grains are kept refined before finish rolling due to the relatively lower temperature;
carrying out finish rolling for 6 passes, wherein the initial rolling temperature is less than 950 ℃, the final rolling temperature is 780-840 ℃, the accumulated reduction rate of the last two passes of the finish rolling is more than or equal to 18 percent, the finish rolling adopts 7 frames for continuous rolling, the 4 th frame is used for overhead passage, the deformation is fully accumulated by large deformation at the lower temperature of the last two passes of the finish rolling, and the formation of acicular ferrite is facilitated in the subsequent cooling process;
and (3) controlling cooling: cooling to 300-380 ℃ at 30-40 ℃/s, coiling, and controlling through proper cooling speed and reasonable coiling temperature to avoid the formation of a large amount of coarse polygonal ferrite or low-toughness lath bainite, so as to obtain the plate coil which mainly comprises acicular ferrite, contains a small amount of refined polygonal ferrite, a small amount of granular bainite and a small amount of martensite islands and has good toughness.
As an improvement of the technical scheme, the smelting comprises a converter, an argon station, a ladle furnace, a vacuum furnace and calcium treatment in sequence.
The main alloying element content of the invention is based on the following principle:
carbon (C): the most economical strengthening elements improve the strength of steel through interstitial solid solution strengthening, increase the carbon content, greatly improve the hardenability of the steel and obtain a high-strength low-temperature phase transformation structure such as lath bainite, but for thick-specification high-toughness X90-grade pipeline steel, the uneven structure in the thickness direction of a coil and the reduced toughness of the steel are aggravated due to the higher C content; but too low can result in insufficient strength, and the proper addition amount of carbon is 0.030% -0.050%, and the preferable carbon content is 0.035% -0.045%;
silicon (Si): mainly plays a role in solid solution strengthening, is beneficial to desulphurization in the auxiliary smelting process, and the more suitable addition amount of silicon is 0.10-0.30 percent;
manganese (Mn): the economic alloying elements can obviously improve the yield and tensile strength of the steel. However, the higher the manganese content is, the more difficult the component segregation control is, and further the more serious structure segregation and performance unevenness are caused, the more suitable manganese addition amount is 1.60-1.90%, and the preferable manganese content is 1.75-1.85%;
phosphorus, sulfur, nitrogen (P, S, N): phosphorus, sulfur and nitrogen are harmful elements in the pipeline steel, so that various brittleness tendencies of the steel are increased, particularly, the steel grade TiN inclusion is too large in size and too high in content due to too high nitrogen content, and is unfavorable for toughness, and therefore the contents of phosphorus, sulfur and nitrogen in the steel are reduced as much as possible;
copper (Cu): the alloy mainly plays a role in solid solution strengthening in steel and improves the corrosion resistance of the steel, but the solid solution strengthening effect is weaker, and the addition of chromium and molybdenum in the steel also makes up the defect of corrosion resistance to a certain extent, so that copper is not added to reduce the alloy cost; in addition, the removal of copper is also beneficial to improving the toughness of steel to a certain extent;
nickel (Ni): the ductile-brittle transition temperature is favorably reduced, but the alloy cost is higher when a large amount of the alloy is added, and the impact energy of steel can be reduced, the proper addition amount is 0.15-0.35%, and the preferable nickel content is 0.20-0.30%;
chromium, molybdenum (Cr, Mo): the element with strong hardenability obviously delays ferrite phase transformation, is beneficial to bainite (acicular ferrite) phase transformation, but if the content is too high, the proportion of martensite of steel grades is increased, and is not beneficial to toughness; if the content is too low, the hardenability is insufficient, large-size polygonal ferrite can be formed, the strength is insufficient, and the suitable chromium addition amount is 0.15-0.35% and 0.20-0.30%;
niobium, titanium (Nb, Ti): the microalloying elements can obviously refine grains and play a role in precipitation strengthening, meanwhile, the austenite recrystallization temperature of the steel can be obviously improved, the range of a non-recrystallization region is expanded, the increase of accumulated strain in the non-recrystallization region is facilitated, the phase change of acicular ferrite in the cooling control process is promoted, the addition amounts of niobium and titanium are respectively 0.060% -0.080% and 0.010% -0.025%, wherein the preferable addition amount of niobium is 0.060% -0.070%;
vanadium (V): microalloying elements are difficult to precipitate under the production process conditions of pipeline steel, mainly play a role in solid solution strengthening, particularly can obviously improve the tensile strength and reduce the yield ratio, but can reduce the impact toughness of the steel when the content of vanadium is too high, and the more suitable addition amount of vanadium is 0.020-0.040 percent respectively;
aluminum (Al): aluminum is a main deoxidizing element in steel, so that the oxygen content in the steel can be remarkably reduced, meanwhile, AlN is formed by combination of the aluminum and nitrogen, crystal grains can be effectively refined, but when the aluminum content in the steel exceeds 0.06%, oxide inclusions of the aluminum are easily increased, the cleanliness of the steel is reduced, the low-temperature toughness of the steel is not good, and the more suitable adding amount of the aluminum is 0.015% -0.060% 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, the impact toughness of the steel is improved, excessive addition is easy to reduce the cleanliness of the steel, the low-temperature toughness of the steel is not favorable, and the more suitable addition amount of calcium is 0.0008-0.0025 percent respectively;
boron (B): under the combined action of other elements, the hardenability of the steel is obviously improved, and a lath bainite structure is obtained; however, the toughness of the steel is greatly reduced by increasing the proportion of lath bainite in high-grade pipeline steel, and the content of boron in the steel is strictly limited.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the design of ultra-low C content is adopted, and the low-temperature toughness of thick plate coils is adopted; meanwhile, reasonable Mn, Cr and Mo alloy matching design is adopted, so that good hardenability is ensured, and more lath bainite and martensite structures are avoided; the way of rough rolling and finish rolling under low temperature and high pressure ensures the refinement effect of austenite grains and promotes the phase change of acicular ferrite in the cooling process; reasonable matching design of cooling speed and coiling temperature ensures that the structure which mainly comprises acicular ferrite (80-90 percent), contains a small amount of refined polygonal ferrite (3-8 percent), a small amount of granular bainite (3-8 percent) and a small amount of martensite island (less than or equal to 4 percent) is obtained, and can meet the requirement that the structure is more than or equal to 400 hundred million m3The construction requirement of the oil and gas transmission pipeline is met, the requirements that the CVN is more than or equal to 305J at the temperature of minus 20 ℃ and the DWTT is more than or equal to 85 percent at the temperature of minus 15 ℃ and the uniform elongation Agt is more than or equal to 5 percent are met, and the tissue uniformity in the thickness direction is ensured.
Detailed Description
Other aspects, features and advantages of the present invention will become apparent from the following detailed description, which, when taken in conjunction with the drawings, illustrate by way of example the principles of the invention.
An X90-grade high-strength pipeline steel plate coil with the thickness of more than or equal to 20mm comprises the following components in percentage by mass:
c: 0.030 to 0.050%, Si: 0.10-0.30%, Mn: 1.60-1.90%, P is less than or equal to 0.012%, S is less than or equal to 0.0015%, Cu is less than or equal to 0.10%, Ni: 0.15-0.35%, Cr: 0.15% -0.30%, Mo: 0.20-0.30%, Nb: 0.060% -0.080%, V: 0.020-0.040%, Ti: 0.010-0.025%, N is less than or equal to 0.0050%, Al: 0.015 to 0.060%, Ca: 0.0008 to 0.0025 percent of the total weight of the alloy, less than or equal to 0.0004 percent of B, and the balance of Fe and inevitable impurities; pcm: 0.163 to 0.19 percent, Mn + Cr +3 Mo: 2.65 to 2.85 percent.
Further, C: 0.035-0.045%, Mn: 1.75-1.85%, Ni: 0.20-0.30%, Nb: 0.060% -0.070%.
The structure in the obtained pipeline steel plate coil is as follows: acicular ferrite, polygonal ferrite, granular bainite and martensite islands, which respectively account for the following ratio:
acicular ferrite: 80% -90%, polygonal ferrite: 3% -8%, granular bainite: 3-8% and martensite island is less than or equal to 4%.
A manufacturing method of an X90-grade high-strength pipeline steel plate coil with the thickness of more than or equal to 20mm comprises the following process flows: converter, argon station, ladle furnace, vacuum furnace, calcium treatment, casting blank heating, controlled rolling and controlled cooling;
heating a casting blank: the heating temperature is 1150-1200 ℃, and the heat preservation time is 60-120 min;
controlling rolling: carrying out rough rolling for 6 times in total, rolling the billet with the thickness of 230mm to 60mm, wherein the relative reduction rate of the last two times of rough rolling is more than or equal to 23 percent, and the finishing temperature is 960-1000 ℃;
carrying out finish rolling for 6 times in total, wherein the initial rolling temperature is less than 950 ℃, the final rolling temperature is 780-840 ℃, and the cumulative reduction rate of two times at the end of the finish rolling is more than or equal to 18 percent;
and (3) controlling cooling: cooling to 300-380 ℃ at the speed of 30-40 ℃/s and then coiling.
The components, the processes and the properties of the examples and the comparative examples of the invention are respectively shown in tables 1 to 3:
TABLE 1 tabulated values of the ingredients (wt,%) for the inventive and comparative examples
TABLE 2 List of the main process parameters of the examples of the invention and the comparative examples
TABLE 3 Main Properties of the inventive and comparative examples
As can be seen from tables 1-3, compared with the comparative example, the thickness of the steel of the invention in the example is more than 20mm, and the impact energy is more than 305J while the strength is ensured to meet the strength performance requirement of X90 grade pipeline steel.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (5)
1. An X90-grade high-strength pipeline steel plate coil with the thickness of more than or equal to 20mm is characterized by comprising the following components in percentage by mass:
c: 0.030 to 0.050%, Si: 0.10-0.30%, Mn: 1.60-1.90%, P is less than or equal to 0.012%, S is less than or equal to 0.0015%, Cu is less than or equal to 0.10%, Ni: 0.15-0.35%, Cr: 0.15% -0.30%, Mo: 0.20-0.30%, Nb: 0.060% -0.080%, V: 0.020-0.040%, Ti: 0.010-0.025%, N is less than or equal to 0.0050%, Al: 0.015 to 0.060%, Ca: 0.0008 to 0.0025 percent of the total weight of the alloy, less than or equal to 0.0004 percent of B, and the balance of Fe and inevitable impurities; pcm: 0.163 to 0.19 percent, Mn + Cr +3 Mo: 2.65 to 2.85 percent.
2. The coil of X90 grade high-strength pipeline steel plate with the thickness of more than or equal to 20mm as claimed in claim 1, wherein C: 0.035-0.045%, Mn: 1.75-1.85%, Ni: 0.20-0.30%, Nb: 0.060% -0.070%.
3. The high-strength pipeline steel plate coil with the thickness of more than or equal to 20mm and the X90 level as claimed in claim 1 or 2, wherein the structure in the pipeline steel plate coil is as follows: acicular ferrite, polygonal ferrite, granular bainite and martensite islands, which respectively account for the following ratio:
acicular ferrite: 80% -90%, polygonal ferrite: 3% -8%, granular bainite: 3-8% and martensite island is less than or equal to 4%.
4. The manufacturing method of the X90-grade high-strength pipeline steel plate coil with the thickness of more than or equal to 20mm is characterized by comprising the following process flows of: smelting, casting blank heating, controlled rolling and controlled cooling;
heating a casting blank: the heating temperature is 1150-1200 ℃, and the heat preservation time is 60-120 min;
controlling rolling: carrying out rough rolling for 6 times in total, rolling the billet with the thickness of 230mm to 60mm, wherein the relative reduction rate of the last two times of rough rolling is more than or equal to 23 percent, and the finishing temperature is 960-1000 ℃;
carrying out finish rolling for 6 times in total, wherein the initial rolling temperature is less than 950 ℃, the final rolling temperature is 780-840 ℃, and the cumulative reduction rate of two times at the end of the finish rolling is more than or equal to 18 percent;
and (3) controlling cooling: cooling to 300-380 ℃ at the speed of 30-40 ℃/s and then coiling.
5. The method for manufacturing the X90-grade high-strength pipeline steel plate coil with the thickness of more than or equal to 20mm according to claim 4, wherein the smelting comprises a converter, an argon station, a ladle furnace, a vacuum furnace and calcium treatment in sequence.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010617441.1A CN111607750A (en) | 2020-06-30 | 2020-06-30 | X90-grade high-strength pipeline steel plate coil with thickness of more than or equal to 20mm and manufacturing method thereof |
| PCT/CN2021/102569 WO2022001904A1 (en) | 2020-06-30 | 2021-06-26 | X90-grade high-strength pipeline steel plate coil having thickness of ≥ 20 mm and manufacturing method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112575253A (en) * | 2020-11-24 | 2021-03-30 | 中国石油天然气集团有限公司 | X80M steel material and X80M steel pipe for longitudinal submerged arc welding and preparation method thereof |
| CN113564464A (en) * | 2021-06-29 | 2021-10-29 | 武汉钢铁有限公司 | 25.4mm hot continuous rolling limit specification pipeline steel plate coil and manufacturing method thereof |
| WO2022001904A1 (en) * | 2020-06-30 | 2022-01-06 | 武汉钢铁有限公司 | X90-grade high-strength pipeline steel plate coil having thickness of ≥ 20 mm and manufacturing method therefor |
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| CN116288036A (en) * | 2022-09-09 | 2023-06-23 | 山东钢铁集团日照有限公司 | Production method of one-blank multistage pipeline steel plate |
| CN115652191A (en) * | 2022-09-26 | 2023-01-31 | 武汉钢铁有限公司 | Economical titanium-containing pipeline steel and production method thereof |
| CN115449698B (en) * | 2022-09-30 | 2024-01-23 | 马鞍山钢铁股份有限公司 | Microbial corrosion resistant pipeline steel with yield strength of 480MPa and preparation method thereof |
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| WO2022001904A1 (en) | 2022-01-06 |
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