CN104073744B - The high tenacity X80 pipe line steel coiled sheet of thickness >=18.5mm and production method - Google Patents
The high tenacity X80 pipe line steel coiled sheet of thickness >=18.5mm and production method Download PDFInfo
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Abstract
The high tenacity X80 pipe line steel coiled sheet of thickness >=18.5mm, its chemical composition and wt%:C:0.025～0.055, Si:0.10～0.35, Mn:1.85～2.00, P :≤0.012, S≤0.0015, Cu:0.15～0.30, Cr:0.20～0.40, Ni:0.15～0.40, Mo:0.20～0.40, Nb:0.070～0.095, V:0.015 ~ 0.040, Ti:0.005～0.025, Al:0.015～0.045, N :≤0.008, Ca:0.0010～0.0040；Production stage: strand is heated to 1100～1180 DEG C；Roughing；Finish rolling；Water cooling；Batch；Air cooling is to room temperature.The steel plate thickness that the present invention not only produces is more than 18.4mm, and the tissue of thickness direction, performance are uniform, and mechanical property reaches: yield strength (Rt0.5) >=570MPa, tensile strength (Rm) >=625MPa, yield tensile ratio (Rt0.5/Rm)≤0.90, elongation percentage (A50mm) >=40%, 20 DEG C of KV2>=300J, 15 DEG C of DWTT SA >=85%.
Description
Technical field
The present invention relates to a kind of oil pipeline steel and production method thereof, specifically belong to high tenacity X80 pipe line steel coiled sheet and the production method of a kind of thickness >=18.5mm, it is applicable to long distance pipeline backbone and builds required pipe line steel in one, two class areas.
Background technology
Along with the high speed development of World Economics, growing with each passing day the demand of oil, natural gas equal energy source resource, oil, the construction of Long-distance Transmission Pipeline obtain flourish.For improving transfer efficiency and the economy of operation of long distance pipeline, in recent years, discharge pressure and the caliber of pipeline are continuously increased, the Russian Bovanenkovo Uhta pipeline currently constructed, China transfer natural gas from the west to the east three lines, Central Asia pipeline and completed the domestic and international great engineering in pipeline backbones such as U.S.'s Alaska pipeline of planning, Zhejiang, China new Guangdong line and all use the high pressure of 12MPa, and caliber reaches 1219mm even 1422mm.For ensureing the safety that this kind of high pressure long distance pipeline runs, long distance pipeline commonly used heavy wall X80 pipe line steel, and in order to reduce pipe-line construction cost, using two class areas of thick-wall pipeline steel plate to also begin to attempt pipe line steel coiled sheet traditionally, it is the highest that the thickness of raw material coiled sheet is up to 21.4mm, 22mm.Increase along with strip thickness, it is ensured that its uniformity with good low temperature fracture toughness and structure property becomes stern challenge, and the steady production how realizing heavy wall X80 pipe line steel coiled sheet is a technical barrier the most thorny equally.
Through retrieval, Chinese Patent Application No. is the patent documentation of 200410013265.1, it discloses one " high-intensity high-tenacity feed-line steel and preparation method thereof ", its use low C, high Mn, high Nb, without Cr, V, add the composition design of the alloying elements such as Cu, Ni, Mo, the method manufacturing Hi-grade steel X80 hot continuous rolling coiled sheet in conjunction with TMCP technique on a small quantity.It is not enough to there is quenching degree in the document, and coiling temperature higher (400～600 DEG C), and is only applicable to produce the hot continuous rolling X80 pipe line steel of relatively Thin Specs (below 18.4mm), and on steel plate thickness direction, tissue and low temperature fracture toughness can not meet requirement.
Chinese Patent Application No. is the patent documentation of 201210022461.X, it discloses " a kind of high strength and low cost toughness X80 pipe line steel roll bending and production method thereof ", its use low C, high Mn, low Mo, high Nb, without Cu, Ni, V, a small amount of composition design adding the alloying elements such as Cr, the method producing X80 pipe line steel roll bending in conjunction with TMCP technique.Its deficiency existed is difficult to thickness equally in more than the 18.5mm X80 pipe line steel coiled sheet matched well to high intensity Yu high tenacity.
Chinese Patent Application No. is the patent documentation of 200910048140.5, it discloses " a kind of X80 pipe line steel Wide and Thick Slab and manufacture method thereof ", it uses low C, high Mn, low Mo, high Nb, high Cr, add the composition design of the alloying elements such as Cu, Ni, the method producing X80 pipe line steel Wide and Thick Slab in conjunction with TMCP technique on a small quantity.Rear final cooling temperature higher (400～600 DEG C) is rolled in its existence, is difficult to the special tissue of think gauge pipe line steel coiled sheet, performance requirement equally, and it uses the mode of cut deal uni-tension rolling to produce, and production efficiency and lumber recovery are the most relatively low, and manufacturing cost is higher.
Summary of the invention
The present invention solves the thickness of prior art less than 18.4mm, and there is the deficiency that quenching degree is not enough, thickness of slab directional performance is uneven, fracture toughness is poor, it is provided that a kind of thickness >=18.5mm), Rt0.5>=570MPa, Rm≥625MPa、-20℃ KV2>=300J, the X80 level pipe line steel coiled sheet of-15 DEG C of DWTT SA >=85% and production method thereof.
The application is to achieve these goals, on the purpose realizing the application play impact or the alloying element of pivotal role and technique conduct in-depth research its result, in order to realize purpose described herein, it is therefore proposed that mainly have employed appropriateness in terms of composition to reduce carbon element content, improve Cu, Cr, Ni, Mo etc. and improve the alloying element content of quenching degree, and it being combined the method adding Nb, V, Ti microalloying, the roller repairing speed and the finish rolling reduction ratio that have solved to have caused after coiled sheet thickness increases decline the problem that the structure refinement caused is insufficient；The optimization of composition, also need to the technique of coupling, therefore, the application is after deliberation, process aspect the most mainly takes the measures such as low-temperature heat, low temperature big pressure roughing and ultralow temperature curling, refine the finished product tissue after original austenite grains size and phase transformation further, improve the structure property uniformity on thickness direction.
Realize the measure of above-mentioned purpose:
The high tenacity X80 pipe line steel coiled sheet of thickness >=18.5mm, its chemical composition and percentage by weight be: C:0.025～0.055, Si:0.10～0.35, Mn:1.85～2.00, P :≤0.012, S≤0.0015, Cu:0.15～0.30, Cr:0.20～0.40, Ni:0.15～0.40, Mo:0.20～0.40, Nb:0.070～0.095, V:0.015 ~ 0.040, Ti:0.005～0.025, Al:0.015～0.045, N :≤0.008, Ca:0.0010～0.0040, and surplus is Fe and is inevitably mingled with；Meet, Ca/S=1.0 ~ 3.0, welding cold crack sensitivity FACTOR P cm=simultaneously
C+Si/30+(Mn+Cu+Cr)/20+Mo/15+Ni/60+V/10+5B≤0.23%；-20℃ KV2>=300J ,-15 DEG C of DWTT SA >=85%；Metallographic structure is: ferrite bainite+a small amount of granular bainite.
The method producing the high tenacity X80 pipe line steel coiled sheet of thickness >=18.5mm, its step:
1) after smelting and being cast into base, strand is heated uniformly to 1100～1180 DEG C；
2) carrying out roughing, and control roughing end temp at 1000～1050 DEG C, single pass reduction ratio is not less than 12%, and roughing adds up reduction ratio and is not less than 70%；
3) carrying out finish rolling, and control entry temperature at finishing at 930～980 DEG C, accumulative reduction ratio is not less than 60%；When rolling temperature low-temperature space rolling below 900 DEG C, its accumulative reduction ratio is not less than 40%；Finishing temperature is at 790～850 DEG C；
4) carry out water cooling, under cooldown rate is 10～20 DEG C/s, is cooled to 200 ~ 400 DEG C；
5) batch, control coiling temperature at 200 ~ 400 DEG C；
6) air cooling is to room temperature.
The reason that in the present invention, each element and the effect of master operation and value limit is as follows:
Carbon (C) content is 0.020～0.055%, add a certain amount of carbon, the intensity of steel can be greatly improved, but to special think gauge pipe line steel, for the Central Carbon Segregation produced during reducing casting blank solidification as far as possible, improve steel billet cleanliness factor, use the design of ultralow-carbon composition, carbon content is defined to 0.020～0.055%.As its content declines to a great extent less than the yield strength of 0.02% coiled sheet, need to add the alloys such as Mo, Ni, Nb in a large number to make up, as carbon content is higher than 0.055% carbon enrichment the most easily causing strand heart portion, low temperature drop weight tearing toughness is caused to be difficult to reach technical conditions requirement.
Silicon (Si) content is 0.15～0.35%, acts primarily as solution strengthening effect, avoids because adding that excess silicon causes the moulding of steel, toughness significantly deteriorates simultaneously.
Manganese (Mn) content is 1.85～2.00%, adds higher economic alloy element manganese, can significantly improve the intensity of steel, additionally, manganese can also crystal grain thinning to a certain extent, improve the impact flexibility of steel, but the manganese of excess is easily formed segregation, cause composition and the tissue odds of steel.
Niobium (Nb) content is 0.070～0.095%, niobium can significantly improve the austenite recrystallization temperature of steel, expand Unhydrated cement scope, facilitate implementation high temperature controlled rolling, reduce mill load, niobium can also suppress Austenite Grain Growth simultaneously, has significant refined crystalline strengthening and precipitation strength effect, therefore uses the composition of high niobium to design.
Vanadium (V) content is 0.015 ~ 0.040%, add appropriate vanadium and can strengthen the precipitation strength effect of Nb, the intensity of steel is significantly improved in the case of not affecting coiled sheet low-temperature flexibility, but content of vanadium adds very few (less than 0.01%), then strengthen DeGrain, easily cause low-temperature impact toughness to be decreased obviously higher than 0.04%.
Titanium (Ti) content is 0.010～0.025%, titanium is similar with niobium effect in steel, there are stronger refined crystalline strengthening and precipitation strength effect, the titanium of trace can also at high temperature be combined with carbon, oxygen, form the precipitate of high temperature refractory, be conducive to suppressing the Austenite Grain Growth of welding heat affected zone, significantly improve the toughness of welding heat affected zone.
Molybdenum (Mo) content is 0.20～0.40%, molybdenum is significantly postponed γ → α and is changed, suppression ferrite and pearlite forming core, promotes the formation with the bainite/acicular ferrite of high density dislocation substructure so that steel obtains bainite/acicular ferrite structure in the range of rolling the cooling rate that later is wider.For ensureing the special tissue of think gauge pipe line steel thickness direction, performance uniformity, Mo content is controlled in higher level.
Nickel (Ni) content is 0.15～0.40%, and nickel can be effectively improved the quenching degree of steel, has certain solution strengthening effect, moreover it is possible to significantly improve the low-temperature flexibility of steel.Additionally, nickel can also effectively stop the check crack that the red brittleness of Cu causes, and significantly improve the decay resistance of steel.But nickel is similar with molybdenum, belonging to precious metal, the manufacturing cost being easily caused steel is greatly improved, and is difficult to remove additionally, too high nickel content easily causes steel-plate iron oxide scale, causes plate surface quality problem.
The content of chromium (Cr) is 0.20～0.40%, and chromium can be effectively improved the quenching degree of steel, and has stronger solution strengthening effect, and cheap, it is possible to effectively substitute the expensive alloying elements such as Mo, Ni, reduce production cost, additionally, add certain chromium can also improve weather-proof, the decay resistance of steel.But the Cr of excess has significant deleterious effects to the fracture toughness of special think gauge pipe line steel, therefore, controls Cr content in reasonable level.
The content of copper (Cu) is 0.15～0.30%, adds copper in right amount, improves intensity and the quenching degree of steel, and can improve weather-proof, the decay resistance of steel.But copper is low-melting-point metal, easily causes hot-short, add excess unfavorable to the low-temperature flexibility of steel.
The content of aluminum (Al) is 0.015～0.045%, and aluminum is deoxidant element main in steel, it is possible to significantly reducing the oxygen content in steel, aluminum forms AlN with the combination of nitrogen simultaneously, it is possible to crystal grain thinning effectively.But when in steel, aluminum content exceedes a certain amount of, the oxide being easily caused aluminum is mingled with substantially increase, reduces the cleanliness factor of steel, unfavorable to the low-temperature flexibility of steel.
The content of calcium (Ca) is 0.0010～0.0040%, during double refining, steel is carried out Calcium treatment, can improve the inclusion morphology in steel, significantly improves the transverse impact toughness of steel.
Phosphorus (P), sulfur (S), nitrogen (N) content are respectively as follows: [%P]≤0.012, [%S]≤0.0015, [%N]≤0.008.Phosphorus is easily caused the cold short of steel, and sulfur easily causes hot-short, and nitrogen easily causes the quenching inefficacy of steel and deformation to lose efficacy, and causes the unstable properties of steel, therefore should reduce the phosphorus in steel, sulfur, the content of nitrogen as far as possible.
Ca/S=1.5 ~ 3.0, the strict calcium sulfur ratio controlled in steel, be conducive to steel inclusion is carried out degenerative treatments, improve the anisotropic of steel, prevent Ca content from adding simultaneously and too high cause inclusion content to raise.
Welding cold crack sensitivity FACTOR P cm≤0.23%, to ensure that steel has good welding performance.
Compared with prior art, the steel plate thickness not only produced is more than 18.4mm to the present invention, and the tissue of thickness direction, performance are uniform, and the mechanical property of steel plate is: yield strength (Rt0.5) >=570MPa, tensile strength (Rm) >=625MPa, yield tensile ratio (Rt0.5/Rm)≤0.90, elongation percentage (A50mm) >=40% ,-20 DEG C of KV2>=300J ,-15 DEG C of DWTT SA >=85%.Long distance pipeline backbone can be fully met and build in one, two class areas required.
Detailed description of the invention
Below the present invention is described in detail:
Table 1 is the value list of various embodiments of the present invention and comparative example；
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example；
Table 3 is various embodiments of the present invention and comparative example performance detection case list.
Various embodiments of the present invention produce according to following steps:
1) after smelting and being cast into base, strand is heated uniformly to 1100～1180 DEG C；
2) carrying out roughing, and control roughing end temp at 1000～1050 DEG C, single pass reduction ratio is not less than 12%, and roughing adds up reduction ratio and is not less than 70%；
3) carrying out finish rolling, and control entry temperature at finishing at 930～980 DEG C, accumulative reduction ratio is not less than 60%；When rolling temperature low-temperature space rolling below 900 DEG C, its accumulative reduction ratio is not less than 40%；Finishing temperature is at 790～850 DEG C；
4) carry out water cooling, under cooldown rate is 10～20 DEG C/s, is cooled to 200 ~ 400 DEG C；
5) batch, control coiling temperature at 200 ~ 400 DEG C；
6) air cooling is to room temperature.
Table 1 various embodiments of the present invention and the chemical constituent of comparative example and weight percentage
Table 2 various embodiments of the present invention and the main technologic parameters of comparative example
Table 3 various embodiments of the present invention and the mechanics of comparative example and weather resistance testing result
By table 3 data it can be seen that the present invention is controlled by the combination of composition and technique, can realize thickness 18.5mm above X80 level pipe line steel coiled sheet high-strength, mould, toughness coupling, and comparative example is due to composition or the difference of cooling controlling and rolling controlling process, intensity, toughness are difficult to reach the technology requirement of more than 18.5mm X80 level pipe line steel.
Above-described embodiment is only and most preferably enumerates, and is not the restriction to embodiments of the present invention.
Claims (5)
1. the high tenacity X80 pipe line steel coiled sheet of thickness >=18.5mm, its chemical composition and percentage by weight be: C:0.045, Si:0.11, Mn:1.96, P:0.009, S:0.0006, Cu:0.:24, Cr:0.21, Ni:0.16, Mo:0.25, Nb:0.071, V:0.032, Ti:0.024, N :≤0.008, Ca:0.0011, surplus is Fe and is inevitably mingled with.
2. the high tenacity X80 pipe line steel coiled sheet of thickness >=18.5mm, its chemical composition and percentage by weight be: C:0.031, Si:0.35, Mn:2.0, P:0.012, S:0.0012, Cu:0.:26, Cr:0.40, Ni:0.24, Mo:0.35, Nb:0.08, V:0.015, Ti:0.009, N :≤0.008, Ca:0.0026, surplus is Fe and is inevitably mingled with.
3. the high tenacity X80 pipe line steel coiled sheet of thickness >=18.5mm, its chemical composition and percentage by weight be: C:0.025, Si:0.28, Mn:1.93, P:0.006, S:0.0015, Cu:0.:30, Cr:0.29, Ni:0. 4, Mo:0.39, Nb:0.086, V:0.024, Ti:0.006, N :≤0.008, Ca:0.0024, surplus is Fe and is inevitably mingled with.
4. the high tenacity X80 pipe line steel coiled sheet of thickness >=18.5mm, its chemical composition and percentage by weight be: C:0.028, Si:0.13, Mn:1.92, P:0.01, S:0.0012, Cu:0.:17, Cr:0.26, Ni:0. 27, Mo:0.28, Nb:0.083, V:0.03, Ti:0.013, N :≤0.008, Ca:0.0015, surplus is Fe and is inevitably mingled with.
5. the method for the high tenacity X80 pipe line steel coiled sheet of production thickness >=18.5mm according to any one of claim 1 to 4, its step:
1) after smelting and being cast into base, strand is heated uniformly to 1100～1152 DEG C；
2) carrying out roughing, and control roughing end temp at 1000～1050 DEG C, single pass reduction ratio is not less than 12%, and roughing adds up reduction ratio and is not less than 70%；
3) carrying out finish rolling, and control entry temperature at finishing at 930～980 DEG C, accumulative reduction ratio is not less than 60%；When rolling temperature low-temperature space rolling below 900 DEG C, its accumulative reduction ratio is not less than 40%；Finishing temperature is at 790～850 DEG C；
4) carry out water cooling, under cooldown rate is 10～20 DEG C/s, is cooled to 200 ~ 400 DEG C；
5) batch, control coiling temperature at 200 ~ 343 DEG C；
6) air cooling is to room temperature.
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| CN107406951B (en) * | 2015-03-31 | 2019-09-24 | 杰富意钢铁株式会社 | High-intensitive and ductility steel plate and its manufacturing method |
| CN106811700B (en) * | 2015-12-02 | 2018-04-24 | 鞍钢股份有限公司 | A kind of think gauge acid-resisting X60MS hot-rolled coils and its manufacture method |
| CN107099744A (en) * | 2017-04-01 | 2017-08-29 | 江阴兴澄特种钢铁有限公司 | The X80 bend pipes Pipeline Steel Plate and its manufacture method of a kind of hic resistance |
| CN113617836A (en) * | 2021-06-21 | 2021-11-09 | 日照钢铁控股集团有限公司 | Rolling process for producing low-energy-consumption headless ferrite strip steel |
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| CN103225047A (en) * | 2013-05-10 | 2013-07-31 | 武汉钢铁(集团)公司 | X80 pipeline steel having thickness of 26.5mm or more, and production method thereof |
| CN103602913A (en) * | 2013-12-10 | 2014-02-26 | 武汉钢铁(集团)公司 | X80 steel hot-rolled plate coil for natural gas pipelines and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103225047A (en) * | 2013-05-10 | 2013-07-31 | 武汉钢铁(集团)公司 | X80 pipeline steel having thickness of 26.5mm or more, and production method thereof |
| CN103602913A (en) * | 2013-12-10 | 2014-02-26 | 武汉钢铁(集团)公司 | X80 steel hot-rolled plate coil for natural gas pipelines and preparation method thereof |
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