CN104046896A - Economical X65 petroleum and gas pipeline steel and production method thereof - Google Patents
Economical X65 petroleum and gas pipeline steel and production method thereof Download PDFInfo
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- CN104046896A CN104046896A CN201410092743.6A CN201410092743A CN104046896A CN 104046896 A CN104046896 A CN 104046896A CN 201410092743 A CN201410092743 A CN 201410092743A CN 104046896 A CN104046896 A CN 104046896A
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Abstract
The invention discloses economical X65 petroleum and gas pipeline steel. The economical X65 petroleum and gas pipeline steel comprises, by weight, 0.10-0.14% of C, 0.15-0.40% of Si, 1.10-1.40% of Mn, less than or equal to 0.015% of P, less than or equal to 0.0020% of S, 0.025-0.045% of Nb, 0.041-0.060% of V, 0.005-0.020% of Ti, 0.020-0.050% of Al, and less than or equal to 0.008% of N. The production method comprises the following steps of carrying out melting and pouring blank-molding, heating the casting blank, carrying out rough rolling by a wide-heavy plate mill, carrying out two-stage finish rolling by the wide-heavy plate mill, carrying out cooling and carrying out straightening. The economical X65 petroleum and gas pipeline steel has a price reduced by greater than or equal to 5%, and has steel plate yield strength (R<t 0.5>) greater than or equal to 450MPa, tensile strength (Rm) greater than or equal to 535MPa, yield ratio (R<t 0.5>/Rm) less than or equal to 0.91, elongation percentage (A50mm) greater than or equal to 24%, -20 DEG C KV<2> greater than or equal to 200J and -15 DEG C DWTT SA greater 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 X65 level 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 to the raw-material obdurability of adopted pipe line steel, require more and more higher.
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 201010243241.0 Chinese patent literature, " a kind of manufacture method of X65 pipe line steel " disclosed, it has set forth a kind of Composition Design theory that adopts low C, high Mn, higher Nb, higher V, and uses Steckel mill, by TMCP explained hereafter X65 pipe line steel.The deficiency that the document exists is: added Nb, the V of high level, made production cost high, and also between roughing and finish rolling, needed relaxation, caused that not only production efficiency is lower, and overhead cost increases.
Number of patent application is 200710028175.3 Chinese patent literature, disclose " a kind of method of producing X 65 pipe steel with low cost ", it has set forth a kind of Composition Design that adopts low C, high Mn, higher Nb, micro-Ti to process, in conjunction with the method for TMCP explained hereafter X65 line steel hot rolling coiled sheet.Though the document is not added the precious alloys such as Mo, Ni, Cu, and can reach the obdurability requirement of X65 level pipe line steel, but it is only applicable to the X65 pipe line steel that CSP produces line production Ultra-thin (10mm is following).The pipe line steel of this thin specification is as being used in the conveying of petroleum and natural gas, bearing capacity wretched insufficiency and cannot meeting the demands.
Number of patent application is the Chinese patent literature of 201110350933.X, " a kind of deep-sea pipe line steel and manufacture method thereof of producing based on Steckel mill " disclosed, it has set forth a kind of employing low-carbon (LC)/Ultra-low carbon-Gao Mn-Nb-Ni, the appropriate Composition Design that adds the alloying elements such as Cu, Cr, Mo, the method in conjunction with TMCP explained hereafter deep-sea with X65 pipe line steel.The X65 Pipeline Steel Plate excellent performance that the document is produced, but owing to adding the alloying elements such as expensive Mo, Ni, Cu, and the Heating temperature of strand is higher, causes energy consumption high, and cooling temperature is lower, causes the internal stress of steel plate larger, makes the planeness of steel plate poor.
Number of patent application is 201110232809.3 patent of invention document, it discloses " pipe line steel that deep-sea use >=25mm is thick and production method thereof ", it has set forth a kind of employing low-carbon (LC)/Ultra-low carbon-Gao Mn-Nb-Mo, the appropriate Composition Design that adds the alloying elements such as Cu, Cr, Ni, V, the method in conjunction with TMCP explained hereafter deep-sea with X65 pipe line steel.The thick specification X65 Pipeline Steel Plate of the spy excellent performance that the document is produced, but equally owing to adding the alloying elements such as expensive Mo, Ni, Cu, and the Heating temperature of strand is higher, cause energy consumption high, cooling temperature is lower, causes the internal stress of steel plate larger, makes the planeness of steel plate poor.
Separately have the patent of invention document that an application number is 201210038193.0, it discloses < < an 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, providing a kind of is guaranteeing under the prerequisite of X65 Pipeline Steel Plate excellent performance, make the comparable existing cost of production cost be not less than 5%, and composition and the simple economical X65 petroleum natural gas pipeline steel of technique and production method thereof.
The application to achieve these goals, on realizing the alloying element and the technique that play impact or keying action of the application's object, conduct in-depth research, its result, even in order to guarantee under the prerequisite of X65 mechanical property, 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 0.105～0.125%; Secondly also adopted the technique of coupling, be about to slab heating temperature and be controlled at 1100～1180 ℃, the best is at 1100～1145 ℃; 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, makes the planeness of steel plate better, and can also shorten cooling time, useful to enhancing productivity.
Realize the measure of above-mentioned purpose:
A kind of economical X65 petroleum natural gas pipeline steel, its component and weight percent content are: C:0.10～0.14%, Si:0.15～0.40%, Mn:1.10～1.40%, P :≤0.015%, S≤0.0020%, Nb:0.025～0.045%, V:0.041 ~ 0.060%, Ti:0.005～0.020%, Al:0.020～0.050%, N :≤0.008%, and surplus is Fe and is inevitably mingled with.
Preferably: the weight percent content of C is 0.105～0.125%.
Preferably: the weight percent content of V is 0.041～0.053%.
Produce a kind of economical X65 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 1100～1180 ℃;
3) on wide and heavy plate mill, carry out roughing, control roughing temperature at 980～1130 ℃, percentage pass reduction is not less than 10%;
4) on wide and heavy plate mill, carry out finish rolling, control final rolling temperature at 720～980 ℃, finish rolling accumulation draft 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 1100～1145 ℃.
The effect of each element and master operation in the present invention
Carbon: why the application adopts higher C content, through test, it can significantly improve the intensity of pipe line steel, thereby reduces the add-on of other precious alloys, significantly reduce alloy designs cost, and deep Study on Strengthening and Toughening and repeatedly trial-production are found, if carbon content is no more than 0.14%, by reasonable controlled rolling technique and process for cooling, effectively refinement finished product grain-size, avoids as far as possible or reduces the formation of pearlitic structure, and 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 0.105～0.125%.
Silicon (Si) content is 0.15～0.40%, mainly plays solution strengthening effect, avoids causing the moulding of steel, toughness significantly to worsen because adding excess silicon simultaneously.
Manganese (Mn) content is 1.10～1.40%, 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 at Nb, belong to noble metal, and add the generation that excessive niobium can promote M-A island, reduce the toughness of welded heat affecting zone, therefore, the content of niobium is defined as to 0.025～0.045%.
Vanadium (V), 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-on is higher than 0.06% vanadium, easily cause the ductile-brittle transition temperature of steel to improve, therefore the content of vanadium being controlled to content is 0.041～0.060%, and preferably the weight percent content of V is at 0.041～0.053%.
Titanium (Ti) content is 0.005～0.020%, 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 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 surpasses when a certain amount of, easily causes the oxide inclusion of aluminium obviously to increase, and reduces 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 X65 pipe line steel, than existing price, reduce and be not less than 5%, 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+a small amount of bainite structure (or ferrite+a small amount of bainite+a small amount of pearlitic structure), can realize the matched well of the desired higher-strength of X65 level Pipeline Steel Plate, good plasticity and low-temperature flexibility, the yield strength (R of steel plate
t0.5)>=450MPa, tensile strength (R
m)>=535MPa, yield tensile ratio (R
t0.5/ R
m)≤0.91, 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 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 the horizontal salient features detection statistics of comparative example 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 1100～1180 ℃;
3) on wide and heavy plate mill, carry out roughing, control roughing temperature at 980～1130 ℃, percentage pass reduction is not less than 10%;
4) on wide and heavy plate mill, carry out finish rolling, control final rolling temperature at 720～980 ℃, finish rolling accumulation draft 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 value list (wt%) of table 1 various embodiments of the present invention and comparative example
The steel rolling 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
The economical X65 pipe line steel designed due to the present invention do not add valuable Cu, Ni, Mo element, and Mn, Nb, V content are also lower, the alloy designs cost of more existing X65 pipe line steel ([Mo]: 0.10% left and right; [Nb]: 0.50 ~ 0.65%) calculate about more than 200 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 X65 petroleum natural gas pipeline steel, its component and weight percent content are: C:0.10～0.14%, Si:0.15～0.40%, Mn:1.10～1.40%, P :≤0.015%, S≤0.0020%, Nb:0.025～0.045%, V:0.041 ~ 0.060%, Ti:0.005～0.020%, Al:0.020～0.050%, N :≤0.008%, and surplus is Fe and is inevitably mingled with.
2. a kind of economical X65 petroleum natural gas pipeline steel as claimed in claim 1, is characterized in that: the weight percent content of C is 0.105～0.125%.
3. a kind of economical X65 petroleum natural gas pipeline steel as claimed in claim 1, is characterized in that: the weight percent content of V is 0.041～0.053%.
4. produce a kind of economical X65 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 1100～1180 ℃;
3) on wide and heavy plate mill, carry out roughing, control roughing temperature at 980～1130 ℃, percentage pass reduction is not less than 10%;
4) on wide and heavy plate mill, carry out finish rolling, control final rolling temperature at 720～980 ℃, finish rolling accumulation draft 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 X65 petroleum natural gas pipeline steel as claimed in claim 4, is characterized in that: control slab heating temperature at 1100～1145 ℃.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104862591A (en) * | 2015-05-26 | 2015-08-26 | 宝山钢铁股份有限公司 | Steel for high-strength high-pressure oil pipe, high-pressure oil pipe and manufacturing method of high-pressure oil pipe |
| CN105063482A (en) * | 2015-08-27 | 2015-11-18 | 攀钢集团西昌钢钒有限公司 | X60 pipeline steel and manufacturing method thereof |
| CN105063483A (en) * | 2015-08-27 | 2015-11-18 | 攀钢集团西昌钢钒有限公司 | X65 pipeline steel and production method thereof |
| CN107988562A (en) * | 2016-10-27 | 2018-05-04 | 鞍钢股份有限公司 | A kind of X65 grades inexpensive submerged pipeline steel and its manufacture method |
| CN114959221A (en) * | 2022-06-11 | 2022-08-30 | 新疆八一钢铁股份有限公司 | Manufacturing method of X60-grade micro-alloy wide strip steel for offshore oil conveying pipeline |
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| JP2009209443A (en) * | 2008-03-06 | 2009-09-17 | Sumitomo Metal Ind Ltd | Steel sheet for line pipe, method for producing the same, and line pipe |
| CN103526129A (en) * | 2013-09-27 | 2014-01-22 | 济钢集团有限公司 | Thick-specification acid-corrosion-resisting X65 pipeline steel plate and manufacturing method thereof |
| CN103635600A (en) * | 2011-06-30 | 2014-03-12 | 杰富意钢铁株式会社 | Thick-walled high-strength seamless steel pipe with excellent sour resistance for pipe for pipeline, and process for producing same |
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2014
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009209443A (en) * | 2008-03-06 | 2009-09-17 | Sumitomo Metal Ind Ltd | Steel sheet for line pipe, method for producing the same, and line pipe |
| CN103635600A (en) * | 2011-06-30 | 2014-03-12 | 杰富意钢铁株式会社 | Thick-walled high-strength seamless steel pipe with excellent sour resistance for pipe for pipeline, and process for producing same |
| CN103526129A (en) * | 2013-09-27 | 2014-01-22 | 济钢集团有限公司 | Thick-specification acid-corrosion-resisting X65 pipeline steel plate and manufacturing method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104862591A (en) * | 2015-05-26 | 2015-08-26 | 宝山钢铁股份有限公司 | Steel for high-strength high-pressure oil pipe, high-pressure oil pipe and manufacturing method of high-pressure oil pipe |
| CN104862591B (en) * | 2015-05-26 | 2017-03-22 | 宝山钢铁股份有限公司 | Steel for high-strength high-pressure oil pipe, high-pressure oil pipe and manufacturing method of high-pressure oil pipe |
| CN105063482A (en) * | 2015-08-27 | 2015-11-18 | 攀钢集团西昌钢钒有限公司 | X60 pipeline steel and manufacturing method thereof |
| CN105063483A (en) * | 2015-08-27 | 2015-11-18 | 攀钢集团西昌钢钒有限公司 | X65 pipeline steel and production method thereof |
| CN107988562A (en) * | 2016-10-27 | 2018-05-04 | 鞍钢股份有限公司 | A kind of X65 grades inexpensive submerged pipeline steel and its manufacture method |
| CN114959221A (en) * | 2022-06-11 | 2022-08-30 | 新疆八一钢铁股份有限公司 | Manufacturing method of X60-grade micro-alloy wide strip steel for offshore oil conveying pipeline |
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| CN104046896B (en) | 2016-05-11 |
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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. |
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