CN104046896B - A kind of economical X65 petroleum natural gas pipeline steel and production method thereof - Google Patents
A kind of economical X65 petroleum natural gas pipeline steel and production method thereof Download PDFInfo
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Abstract
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%; Production stage: smelt and pour into base; Strand is heated; Roughing on wide and heavy plate mill; Finish rolling in two stages on wide and heavy plate mill; Cooling; Aligning. The present invention can reduce and be not less than 5% than existing price, and the yield strength (R of steel platet0.5) >=450MPa, tensile strength (Rm) >=535MPa, yield tensile ratio (Rt0.5/Rm)≤0.91, percentage elongation (A50mm）≥24％，-20℃？KV2≥200J，-15℃？DWTT。
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 steelAnd production method.
Background technology
Along with the high speed development of World Economics, the demand of oil, natural gas equal energy source resource is grown with each passing day, oil, skySo the construction of gas long distance pipeline and urban pipe network obtains flourish. For improve long distance pipeline and urban pipe network transfer efficiency andThe economy of operation, in recent years, discharge pressure and the caliber of pipeline constantly increase, to the raw-material obdurability of adopted pipe line steelRequire more and more higher.
The backbone of main long distance pipeline all adopts X70, X80 level pipe line steel, branch line and urban pipe network both at home and abroad at presentSelection mainly adopts even X70 level pipe line steel of X60, X65. But, in existing use steel, contain the units such as expensive Ni, Cu, MoElement, and the heating-up temperature of strand is higher, causes energy consumption high, chilling temperature is lower, causes the internal stress of steel plate larger, makes steel plateGlacing flatness is poor. Traditional C content all adopts lower than 0.1%, because think if C content, higher than 0.1%, can cause pipe line steelToughness and welding performance cannot meet instructions for use. The angle of the present patent application from reducing costs, through lot of experimentsResearch, has overcome this traditional mode of thinking, has proposed under the prerequisite of serviceability that ensures pipe line steel, by improving CContent and reduce the technical measures of raw material production cost.
Through retrieving:
Number of patent application is 201010243241.0 Chinese patent literature, discloses " a kind of manufacturer of X65 pipe line steelMethod ", it has set forth a kind of Composition Design theory that adopts low C, high Mn, higher Nb, higher V, and uses steekle mill, passes throughTMCP explained hereafter X65 pipe line steel. The deficiency that the document exists is: adds Nb, the V of high level, made production cost high, andAlso between roughing and finish rolling, need relaxation, cause that not only production efficiency is lower, and overhead cost increases.
Number of patent application is 200710028175.3 Chinese patent literature, discloses " a kind of low-cost production X65 pipelineThe method of steel ", it has set forth a kind of Composition Design that adopts low C, high Mn, higher Nb, micro-Ti to process, in conjunction with TMCP explained hereafterThe method of X65 line steel hot rolling coiled sheet. Though the document is not added the precious alloys such as Mo, Ni, Cu, and can reach X65 level pipeThe obdurability requirement of line steel, but it is only applicable to the X65 pipe line steel of CSP product line production Ultra-thin (10mm is following). ThisThe pipe line steel of 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, discloses and " a kind of has produced based on steekle millDeep-sea pipe line steel and manufacture method thereof ", it has set forth a kind of employing low-carbon (LC)/Ultra-low carbon-Gao Mn-Nb-Ni, add in right amount Cu,The Composition Design of the alloying element such as Cr, Mo, the method in conjunction with TMCP explained hereafter deep-sea with X65 pipe line steel. The document is producedX65 Pipeline Steel Plate excellent performance, but owing to adding the expensive alloying element such as Mo, Ni, Cu, and the heating-up temperature of strand is higher,Cause energy consumption high, chilling temperature is lower, causes the internal stress of steel plate larger, makes the flatness of steel plate poor.
Number of patent application is 201110232809.3 patent of invention document, and it discloses " the pipe that deep-sea use >=25mm is thickLine steel and production method thereof ", it has set forth a kind of employing low-carbon (LC)/Ultra-low carbon-Gao Mn-Nb-Mo, adds in right amount Cu, Cr, Ni, V etc.The Composition Design of alloying element, the method in conjunction with TMCP explained hereafter deep-sea with X65 pipe line steel. The thick rule of spy that the document is producedLattice X65 Pipeline Steel Plate excellent performance, but equally owing to adding the expensive alloying element such as Mo, Ni, Cu, and the heating-up temperature of strandHigher, cause energy consumption high, chilling temperature is lower, causes the internal stress of steel plate larger, makes the flatness of steel plate poor.
Separately have the patent of invention document that an application number is 201210038193.0, it discloses " a kind of anti abrasive slurrySteel and production method thereof for body feed-line ". Although it is alternative for oil pipeline steel, because it still contains more expensiveCu, Mo element, and the heating-up 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, a kind of prerequisite ensureing X65 Pipeline Steel Plate excellent performance is providedUnder, make the comparable existing cost of production cost be not less than 5%, and composition and the simple economical X65 petroleum gas pipe of techniqueLine steel and production method thereof.
The application to achieve these goals, on realize the application object play impact or the alloy unit of key effectElement and technique conduct in-depth research, and its result, even in order to ensure, under the prerequisite of X65 mechanical property, can also to realize lifeProduce cost comparable existing cost and be not less than 5% object, therefore proposed to adopt aspect composition, be mainly adopted higherC content, its content is 0.1 ~ 0.14%, better is 0.105～0.125%; Secondly the technique that has also adopted coupling, is about toSlab heating temperature is controlled at 1100～1180 DEG C, and the best is at 1100～1145 DEG C; And chilling temperature is controlled at higher550 ~ 650 DEG C of scopes, it not only can make V fully be separated out, and is conducive to the release of the residual stress of steel plate, makes steel plateFlatness better, and can also shorten cool 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%, 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 DEG C;
3) on wide and heavy plate mill, carry out roughing, control roughing temperature at 980～1130 DEG C, percentage pass reduction is not less than10%；
4) on wide and heavy plate mill, carry out finish rolling, control final rolling temperature at 720～980 DEG C, finish rolling accumulation reduction ratio is not lowIn 75%;
5) carrying out coolingly, is under 10～20 DEG C/s, to be cooled to 550 ~ 650 DEG C in cooling velocity;
6) align.
Preferably: control slab heating temperature at 1100～1145 DEG C.
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, therebyReduce the addition of other precious alloys, significantly reduce alloy designs cost, and, deep Study on Strengthening and Toughening and repeatedlyTrial-production discovery, if carbon content is no more than 0.14%, by reasonable controlled rolling technique and process for cooling, effectively refinement finished product crystal grainSize, avoids as far as possible or reduces the formation of pearlitic structrure, and the toughness of steel and welding performance can be guaranteed. Therefore, willCarbon content is defined as 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 because adding excess silicon simultaneouslyThe moulding of steel, toughness significantly worsen.
Manganese (Mn) content is 1.10～1.40%, adds a certain amount of economic alloy element manganese, can significantly improve steelIntensity, in addition, manganese is crystal grain thinning to a certain extent, improves the impact flexibility of steel, but manganese easily forms segregation, leadsThe composition and the tissue odds that cause steel, be therefore controlled at reduced levels by manganese.
Niobium (Nb) content is 0.025～0.045%, and niobium can significantly improve the austenite recrystallization temperature of steel, expands notRecrystallization zone scope, is convenient to realize high temperature controlled rolling, reduces mill load, and niobium can also suppress Austenite Grain Growth, tool simultaneouslyThere are significant refined crystalline strengthening and precipitation strength effect. But belong to precious metal at Nb, and add excessive niobium and can promote M-A islandGeneration, reduce the toughness of welding heat affected 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, addition is higher than 0.06% vanadium, easily cause steelDuctile-brittle transition temperature improves, and therefore the content of vanadium being controlled to content is 0.041～0.060%, the preferably percentage by weight of VContent is at 0.041～0.053%.
Titanium (Ti) content is 0.005～0.020%, and the effect in steel of titanium and niobium is similar, have stronger refined crystalline strengthening andPrecipitation strength effect, the titanium of trace can also be at high temperature combined with carbon, oxygen, forms the precipitate of high temperature infusibility, is conducive to press downThe Austenite Grain Growth of welding heat affected zone processed, significantly improves the toughness of welding heat affected zone.
The content of aluminium (Al) is 0.020～0.050%, and aluminium is deoxidant element main in steel, can significantly reduce in steelOxygen content, simultaneously combination formation AlN, the effectively crystal grain thinning of aluminium and nitrogen. But in steel, aluminium content exceedes a certain amount ofTime, easily cause the oxide inclusions 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 is easyCause the cold short of steel, sulphur easily causes hot-short, and nitrogen easily causes quenching inefficacy and the deformation inefficacy of steel, causes the performance shakiness of steelFixed, 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 technology, can be remarkableReduce the production cost of X65 pipe line steel, reduce and be not less than 5% than existing price, and production efficiency also can be improved. TestShow with assay, by the control of component and content and production technology, can obtain desirable tiny, uniform ferrite+ a small amount of bainite structure (or ferrite+a small amount of bainite+a small amount of pearlitic structrure), can realize X65 level Pipeline Steel Plate instituteThe matched well of higher-strength, good plasticity and the low-temperature flexibility requiring, the yield strength (R of steel platet0.5) >=450MPa, tensionIntensity (Rm) >=535MPa, yield tensile ratio (Rt0.5/Rm)≤0.91, percentage elongation (A50mm）≥24％，-20℃KV2≥200J，-15℃DWTTSA≥85％。
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 the horizontal main performance 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 DEG C;
3) on wide and heavy plate mill, carry out roughing, control roughing temperature at 980～1130 DEG C, percentage pass reduction is not less than10%；
4) on wide and heavy plate mill, carry out finish rolling, control final rolling temperature at 720～980 DEG C, finish rolling accumulation reduction ratio is not lowIn 75%;
5) carrying out coolingly, is under 10～20 DEG C/s, to be cooled to 550 ~ 650 DEG C in cooling velocity;
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 main performance 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 containMeasure also lower, the alloy designs cost ([Mo]: 0.10% left and right of more existing X65 pipe line steel; [Nb]: 0.50 ~ 0.65%) meterCalculate 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 (2)
1. an economical X65 petroleum natural gas pipeline steel, its component and weight percent content are: C:0.116～0.14%,Si：0.15～0.40%、Mn：1.10～1.40%、P：≤0.015%、S≤0.0020%、Nb：0.025～0.045%、V：0.057~0.060%, Ti:0.005～0.020%, Al:0.020～0.050%, N :≤0.008%, surplus is Fe and is inevitably mingled with.
2. produce the economical X65 petroleum natural gas pipeline of one as claimed in claim 1 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 1100～1145 DEG C;
3) on wide and heavy plate mill, carry out roughing, control roughing temperature at 980～1130 DEG C, 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 DEG C, finish rolling accumulation reduction ratio is not less than75%；
5) carrying out coolingly, is under 13.8～20 DEG C/s, to be cooled to 550 ~ 587 DEG C in cooling velocity;
6) align.
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| 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 |
| CN105063482B (en) * | 2015-08-27 | 2017-05-31 | 攀钢集团西昌钢钒有限公司 | X60 pipe line steels and its production method |
| CN105063483B (en) * | 2015-08-27 | 2017-08-25 | 攀钢集团西昌钢钒有限公司 | X65 pipe line steels and its production method |
| 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 |
| CN114959221B (en) * | 2022-06-11 | 2024-06-07 | 新疆八一钢铁股份有限公司 | Manufacturing method of X60-grade microalloy wide strip steel for offshore oil conveying pipeline |
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| JP6047947B2 (en) * | 2011-06-30 | 2016-12-21 | Ｊｆｅスチール株式会社 | Thick high-strength seamless steel pipe for line pipes with excellent sour resistance and method for producing the same |
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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. |