CN103805865A - Economical X70 petroleum and gas pipeline steel and production method thereof - Google Patents
Economical X70 petroleum and gas pipeline steel and production method thereof Download PDFInfo
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Abstract
The invention relates to economical X70 petroleum and gas pipeline steel, which comprises the following components in percentage by weight: 0.10-0.14% of C, 0.15-0.35% of Si, 1.25-1.50% of Mn, no more than 0.015% of P, no more than 0.0020% of S, 0.16-0.25% of Cr, 0.025-0.045% of Nb, 0.030-0.050% of V, 0.008-0.020% of Ti, 0.020-0.050% of Al, and no more than 0.008% of N; the production method comprises the steps of: smelting and pouring into a blank; heating a case blank; performing rough rolling on a wide-heavy plate mill; performing finish rolling on the wide-heavy plate mill by two stages; cooling; straightening. The price is reduced by no less than 5% compared with the existing price, and for a steel plate, the yield strength (R<t0.5>) is more than or equal to 485MPa, the tensile strength (R<m>) is more than or equal to 570MPa, the yielding-to-tensile ratio (R<t0.5>/R<m>) is less than or equal to 0.88, the elongation percentage (A<50mm>) is more than or equal to 24%, -20DEG C KV2 is more than or equal to 200J, -15DEG C WTTSA is more than or equal to 85%.
Description
Technical field
The present invention relates to a kind of pipe line steel and production method thereof, belong to particularly a kind of X70 petroleum natural gas pipeline steel and production method thereof.
Background technology
Along with the high speed development of world economy, the demand of oil, Sweet natural gas equal energy source resource is grown with each passing day, the construction of oil, Long-distance Transmission Pipeline and urban pipe network obtains flourish.For improving long distance pipeline and the transport efficiency of urban pipe network and the economy of operation, in recent years, transfer pressure and the caliber of pipeline constantly increase, and require more and more higher to the raw-material obdurability of adopted pipe line steel.
The trunk main of main long distance pipeline all adopts X70, X80 level pipe line steel both at home and abroad at present, and the selection of branch line and urban pipe network mainly adopts even X70 level pipe line steel of X60, X65.But, in existing use steel, contain the elements such as expensive Ni, Cu, Mo, and the Heating temperature of strand being higher, causes energy consumption high, cooling temperature is lower, causes the internal stress of steel plate larger, makes the planeness of steel plate poor.Traditional C content all adopts lower than 0.1%, because think if C content higher than 0.1%, can cause the toughness of pipe line steel and welding property cannot meet service requirements.The angle of the present patent application from reducing costs, through lot of experiments research, has overcome this traditional mode of thinking, has proposed, under the prerequisite of use properties that guarantees pipe line steel, to reduce the technical measures of starting material production cost by improving C content.
Through retrieving:
Number of patent application is 201110147542.8 Chinese patent literature, it discloses " a kind of low-cost X 70 pipeline steel plate and preparation method thereof ", set forth a kind of Composition Design theory that adopts low C, high Mn, low Nb, and by the method for controlled rolling+supper-fast cooling TMCP explained hereafter low-cost X 70 pipeline steel plate.Although its alloy designs cost is relatively low, owing to needing to adopt ultrafast cold technique after rolling, very high to equipment requirements, and it is larger to control cold rear steel plate internal residual stress, and after steel plate controlled rolling and controlled cooling, easy wooden dipper song, is difficult to realize extensive stably manufactured.
Number of patent application is 200410066297.8 Chinese patent literature, it discloses " having acicular ferrite type X70 pipe line steel and the manufacture method thereof of high arrest toughness ", it has set forth a kind of Composition Design that adopts low C, high Mn, high Nb, Mo, adds in right amount Cu, Ni alloy, in conjunction with the method for TMCP explained hereafter X70 pipe line steel.The document is owing to having added the precious alloys such as higher Nb, Mo and Ni, Cu, and production cost is too high, though can reach the obdurability requirement of X70 level pipe line steel, the market competitiveness is poor, is difficult to carry out actual applying.
Number of patent application is the Chinese patent literature of 201110346960.X, it discloses " a kind of X70 line steel hot rolling roll bending and manufacture method thereof ", it has set forth the high Nb-V of the low Mn-of the ultralow C-of the low C/ of a kind of employing, the appropriate Composition Design that adds the alloying elements such as Ni, Cu, Cr, in conjunction with the method for TMCP explained hereafter X70 pipe line steel coiled sheet.The X70 Pipeline Steel Properties excellence that the method is produced, but because Nb content is high, and adding the expensive alloying element such as Ni, Cu, production cost is high, is not suitable for the production of conventional long distance pipeline master, branch line and urban pipe network X70 level pipe line steel.
Number of patent application is 200810079325.8 Chinese patent literature, it discloses " a kind of low cost high performance X 70 pipeline steel and production method ", it has set forth a kind of Composition Design that adopts the high Mn-Nb-V-B of the ultralow C-of low C/, in conjunction with the method for TMCP explained hereafter X70 grade high-strength pipe line steel.The X70 Pipeline Steel Plate that the method is produced is functional, requirement can meet the specification, but the fluctuation of quality product while easily causing producing in batches due to the unstable of B, in the long distance pipeline of countries in the world and urban pipe network, all forbid having a mind to add B element at present, therefore, the inapplicable reality of the method is produced and engineering application.
Separately have the Chinese patent literature that an application number is 201210038193.0, it discloses " a kind of anti abrasive slurry delivery pipe line steel and production method thereof ".Although it is alternative for oil pipeline steel, because it still contains more expensive Cu, Mo element, and the Heating temperature of strand is higher, causes energy consumption high.
Summary of the invention
The present invention is directed to the deficiency that prior art exists, provide a kind of and guaranteeing under the prerequisite of X70 Pipeline Steel Plate excellent performance, and high tenacity ,-20 ℃ of KV
2>=200J ,-15 ℃ of DWTT SA>=85%, good plate cut, and make the comparable existing cost of production cost be not less than 5%, and composition and the simple economical X 70 petroleum pipe steel of technique and production method thereof.
The application to achieve these goals, conducts in-depth research its result to the alloying element and the technique that play impact or keying action of the object that realizes the application, even in order to guarantee under the prerequisite of X70 mechanical property, and high tenacity ,-20 ℃ of KV
2>=150J ,-15 ℃ of DWTT SA>=85%, good plate cut, can also realize the comparable existing cost of production cost and be not less than 5% object, therefore proposed to adopt is mainly to have adopted higher C content aspect composition, and its content is 0.1 ~ 0.14%, and better is 0.105～0.129%; Secondly the technique that has also adopted coupling, is controlled at 1100～1160 ℃ by slab heating temperature, and the best is at 1105～1145 ℃; And cooling temperature is controlled to 550 ~ 650 ℃ of higher scopes, it not only can make V fully be separated out, and is conducive to the release of the unrelieved stress of steel plate, make the planeness of steel plate better, and can also shorten cooling time, to enhancing productivity, reduce production costs useful.
Realize the measure of above-mentioned purpose:
A kind of economical X 70 petroleum natural gas pipeline steel, its component and weight percent content are: C:0.10～0.14, Si:0.15～0.35, Mn:1.25～1.50, P :≤0.015, S≤0.0020, Cr:0.16～0.25, Nb:0.025～0.045, V:0.030 ~ 0.050, Ti:0.008～0.020, Al:0.020～0.050, N :≤0.008, and surplus is Fe and is inevitably mingled with; Metallographic structure is: bainite is no less than 70%, and all the other are ferrite or ferrite+a small amount of pearlitic structure.
Preferably: the weight percent content of C is 0.105～0.129%.
Preferably: the weight percent content of Nb is at 0.0260～0.0295%.
Produce a kind of economical X 70 petroleum natural gas pipeline steel, its step:
1) converter smelting, conventional vacuum are carried out Si-Ca processing, are poured into base;
2), to strand heating, control slab heating temperature at 1100～1160 ℃;
3) on wide and heavy plate mill, carry out roughing, control roughing temperature at 980～1110 ℃, percentage pass reduction is not less than 10%;
4) on wide and heavy plate mill, carry out in two stages finish rolling: control first stage final rolling temperature at 820～940 ℃; First stage finish rolling finishes rear steel plate and treats that temperature is temperature required to the second finish rolling stage; Carry out subordinate phase finish rolling, and control its final rolling temperature at 740～790 ℃, accumulation draft is not less than 40%; The accumulation draft in two finish rolling stages is not less than 75%;
5) carrying out coolingly, is under 10～20 ℃/s, to be cooled to 550 ~ 650 ℃ in speed of cooling;
6) align.
Preferably: control slab heating temperature at 1105～1145 ℃.
The effect of each element and master operation in the present invention
Carbon: why the application adopts higher C content, be that its content is 0.1 ~ 0.14%, because appropriateness increase C content can significantly improve the intensity of pipe line steel, thereby reduce the add-on of other precious alloys, significantly reduce alloy designs cost, and, through deep Study on Strengthening and Toughening and many experiments chamber and industrialness trial-production discovery, if carbon content is no more than 0.14%, by reasonable controlled rolling technique and process for cooling, effectively refinement finished product grain-size, avoid as far as possible or reduce the formation of the poor pearlitic structure of toughness, the toughness of steel and welding property can be guaranteed.Therefore, carbon content is defined as to 0.10～0.14%, preferably: the weight percent content of C is 0.105～0.129%.
Silicon (Si) content is 0.15～0.35%, mainly plays solution strengthening effect, avoids causing the moulding of steel, toughness significantly to worsen because adding excess silicon simultaneously.
Manganese (Mn) content is 1.25～1.50%, add a certain amount of economic alloy element manganese, can significantly improve the intensity of steel, in addition, manganese is crystal grain thinning to a certain extent, improves the impelling strength of steel, but manganese easily forms segregation, the composition and the tissue odds that cause steel, be therefore controlled at lower level by manganese.
Niobium (Nb) content is 0.025～0.045%, and niobium can significantly improve the austenite recrystallization temperature of steel, expands non-recrystallization district scope, be convenient to realize high temperature controlled rolling, reduce mill load, niobium can also suppress Austenite Grain Growth simultaneously, has significant refined crystalline strengthening and precipitation strength effect.But belong to noble metal at Nb, and add excessive niobium and can promote the generation on M-A island, reduce the toughness of welded heat affecting zone, therefore, the content of niobium is defined as to 0.025～0.045%.Preferably: the weight percent content of Nb is at 0.026～0.0295%.
Vanadium (V) content is 0.030～0.050%, and vanadium can supplement the deficiency of niobium precipitation strength, can also improve to a certain extent the postwelding toughness of steel.But because vanadium has stronger precipitation strength and weak refined crystalline strengthening effect, add excessive vanadium easily to cause the ductile-brittle transition temperature of steel to improve, therefore the content of vanadium is controlled to appropriate contents level.
Titanium (Ti) content is 0.008～0.020%, the effect in steel of titanium and niobium is similar, there are stronger refined crystalline strengthening and precipitation strength effect, the titanium of trace can also be at high temperature combined with carbon, oxygen, form the precipitate of high temperature infusibility, be conducive to suppress the Austenite Grain Growth of welded heat affecting zone, significantly improve the toughness of welded heat affecting zone.
The content of chromium (Cr) is 0.16～0.25%, chromium can effectively improve the hardening capacity of steel, and there is stronger solution strengthening effect, and cheap, can effectively substitute the precious alloy elements such as Mo, Ni, reduce production costs, in addition, add certain chromium can also improve weather-proof, the corrosion resistance nature of steel.
The content of aluminium (Al) is 0.020～0.050%, and aluminium is deoxidant element main in steel, can significantly reduce the oxygen level in steel, and the combination of aluminium and nitrogen simultaneously forms AlN, effectively crystal grain thinning.But in steel, aluminium content exceedes when a certain amount of, easily causes the oxide inclusion of aluminium obviously to increase, reduce the cleanliness factor of steel, unfavorable to the low-temperature flexibility of steel.
Phosphorus (P), sulphur (S), nitrogen (N) content are respectively: [%P]≤0.015, [%S]≤0.0020, [%N]≤0.008.Phosphorus easily causes the cold short of steel, and sulphur easily causes hot-short, and nitrogen easily causes that the quenching inefficacy of steel and deformation lost efficacy, and causes the unstable properties of steel, therefore should reduce the content of phosphorus in steel, sulphur, nitrogen as far as possible.
The present invention compared with prior art, adopts the Composition Design of less expensive and easier production technique, can significantly reduce the production cost of X70 pipe line steel, reduce and be not less than 5% than existing price, and production efficiency also can be improved.Test and assay show, by the control of component and content and production technique, can obtain desirable tiny, uniform ferrite+bainite structure (or ferrite+bainite+a small amount of pearlitic structure), can realize the matched well of the desired high strength of X70 level Pipeline Steel Plate, good plasticity and low-temperature flexibility, the yield strength (R of steel plate
t0.5)>=485MPa, tensile strength (R
m)>=570MPa, yield tensile ratio (R
t0.5/ R
m)≤0.88, unit elongation (A
50mm)>=24% ,-20 ℃ of KV
2>=200J ,-15 ℃ of DWTT SA>=85%.
Embodiment
Below the present invention is described in detail:
Table 1 is the value list of various embodiments of the present invention;
Table 2 is the main technologic parameters list of various embodiments of the present invention;
Table 3 is the horizontal salient features detection statistics of various embodiments of the present invention table.
Various embodiments of the present invention are produced according to following steps:
1) converter smelting, conventional vacuum are carried out Si-Ca processing, are poured into base;
2), to strand heating, control slab heating temperature at 1100～1160 ℃;
3) on wide and heavy plate mill, carry out roughing, control roughing temperature at 980～1110 ℃, percentage pass reduction is not less than 10%;
4) on wide and heavy plate mill, carry out in two stages finish rolling: control first stage final rolling temperature at 820～940 ℃; First stage finish rolling finishes rear steel plate and treats that temperature is temperature required to the second finish rolling stage; Carry out subordinate phase finish rolling, and control its final rolling temperature at 740～790 ℃, accumulation draft is not less than 40%; The accumulation draft in two finish rolling stages is not less than 75%;
5) carrying out coolingly, is under 10～20 ℃/s, to be cooled to 550 ~ 650 ℃ in speed of cooling;
6) align.
The composition value list (wt%) of table 1 various embodiments of the present invention and comparative example
The cooling controlling and rolling controlling process of table 2 various embodiments of the present invention and comparative example
The horizontal salient features detection statistics of table 3 various embodiments of the present invention and comparative example table
Because the designed economical X 70 pipeline steel of the present invention does not add valuable Cu, Ni, Mo element, and Mn, Nb, V content are also lower, the alloy designs cost ([Mo]: 0.10% left and right of more existing X70 pipe line steel; [Nb]: 0.50 ~ 0.65%) calculate about more than 300 yuan/ton.
Above-described embodiment only exemplifies for the best, and is not the restriction to embodiments of the present invention.
Claims (5)
1. an economical X 70 petroleum natural gas pipeline steel, its component and weight percent content are: C:0.10～0.14, Si:0.15～0.35, Mn:1.25～1.50, P :≤0.015, S≤0.0020, Cr:0.16～0.25, Nb:0.025～0.045, V:0.030 ~ 0.050, Ti:0.008～0.020, Al:0.020～0.050, N :≤0.008, and surplus is Fe and is inevitably mingled with; Metallographic structure is: bainite is no less than 60%, and all the other are ferrite or ferrite+a small amount of pearlitic structure.
2. a kind of economical X 70 petroleum natural gas pipeline steel as claimed in claim 1, is characterized in that: the weight percent content of C is 0.105～0.129%.
3. a kind of economical X 70 petroleum natural gas pipeline steel as claimed in claim 1, is characterized in that: the weight percent content of Nb is 0.0260～0.0295%.
4. produce a kind of economical X 70 petroleum natural gas pipeline steel as claimed in claim 1, its step:
1) converter smelting, conventional vacuum are carried out Si-Ca processing, are poured into base;
2), to strand heating, control slab heating temperature at 1100～1160 ℃;
3) on wide and heavy plate mill, carry out roughing, control roughing temperature at 980～1110 ℃, percentage pass reduction is not less than 10%;
4) on wide and heavy plate mill, divide two sections and carry out finish rolling: control first stage final rolling temperature at 820～940 ℃; First stage finish rolling finishes rear steel plate and treats that temperature is temperature required to the second finish rolling stage; Carry out subordinate phase finish rolling, and control its final rolling temperature at 740～790 ℃, accumulation draft is not less than 40%; The accumulation draft in two finish rolling stages is not less than 75%;
5) carrying out coolingly, is under 10～20 ℃/s, to be cooled to 550 ~ 650 ℃ in speed of cooling;
6) align.
5. the method for a kind of economical X 70 petroleum natural gas pipeline steel as claimed in claim 4, is characterized in that: control slab heating temperature at 1105～1145 ℃.
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| CN105256240A (en) * | 2015-11-11 | 2016-01-20 | 首钢总公司 | Hot-rolled coiled plate and manufacturing method thereof |
| CN107604259A (en) * | 2017-08-31 | 2018-01-19 | 包头钢铁（集团）有限责任公司 | A kind of X70 line steel hot rollings coiled sheet and its production method |
| CN109306398A (en) * | 2018-10-12 | 2019-02-05 | 西京学院 | The milling method of Nb-Ti miscible precipitate in a kind of control pipe line steel |
| CN113699443A (en) * | 2021-08-02 | 2021-11-26 | 山东钢铁集团日照有限公司 | Quenched and tempered X70 grade pipeline steel for tubular pile and preparation method thereof |
| CN115433874A (en) * | 2022-08-31 | 2022-12-06 | 马鞍山钢铁股份有限公司 | Hot-rolled angle steel with yield strength of 460MPa and temperature resistance of-20 ℃ and production method thereof |
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| CN105256240B (en) * | 2015-11-11 | 2018-05-01 | 首钢集团有限公司 | A kind of hot-rolled coil and its manufacture method |
| CN107604259A (en) * | 2017-08-31 | 2018-01-19 | 包头钢铁（集团）有限责任公司 | A kind of X70 line steel hot rollings coiled sheet and its production method |
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| CN113699443A (en) * | 2021-08-02 | 2021-11-26 | 山东钢铁集团日照有限公司 | Quenched and tempered X70 grade pipeline steel for tubular pile and preparation method thereof |
| CN115433874A (en) * | 2022-08-31 | 2022-12-06 | 马鞍山钢铁股份有限公司 | Hot-rolled angle steel with yield strength of 460MPa and temperature resistance of-20 ℃ and production method thereof |
| CN115433874B (en) * | 2022-08-31 | 2023-08-25 | 马鞍山钢铁股份有限公司 | Hot rolled angle steel with yield strength of 460MPa and minus 20 ℃ resistance and production method thereof |
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| CN103805865B (en) | 2016-04-27 |
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Effective date of registration: 20170711 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |