CN102392187B - Cr-containing pipeline steel X70 hot-rolled plate and production method - Google Patents
Cr-containing pipeline steel X70 hot-rolled plate and production method Download PDFInfo
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Abstract
The invention relates to a Cr-containing pipeline steel X70 hot-rolled plate and a production method, and belongs to the technical field of steel materials. The Cr-containing pipeline steel X70 hot-rolled plate comprises the following components by weight: 0.030-0.080% of C, 1.55-2.00% of Mn, 0.10-0.40% of Si, not more than 0.0050% of S, not more than 0.015% of P, 0.035-0.060% of Nb, 0.008-0.025% of Ti, 0.020-0.060% of Alt, 0.15-0.30% of Cr, and the balance of Fe and inevitable impurities. The production method of the invention realizes the purposes of crystal grain refinement, pipeline steel strength and toughness improvement by using a steckel mill production line and through processes of continuous casting, rolling and cooling. The performance of hot-rolled plates produced by the production method of the invention is superior to standard requirements of X70 pipeline steel plates, and the cost advantage is obvious.
Description
Technical field:
The present invention relates to high strength, high tenacity pipe line steel X70 and the production method thereof of cheaply composition system production of a kind of utilization.A kind of pipeline steel X 70 hot-rolled plate and production method thereof that contains Cr belongs to steel material technical field specifically.
Background technology:
Pipe line steel refers to for delivery of oil, Sweet natural gas etc. large mouthful through Welded Steel Pipe with hot-rolled coil or Wide and Thick Slab.Pipe line steel in use except requiring to have the higher compressive strength, also requires to have higher low-temperature flexibility and good welding property.Along with the continuous increase of oil nature gas demand, the transfer pressure of pipeline and caliber also constantly increase, to increase its transport efficiency.Consider structural stability and the security of pipeline, also need increase the intensity of thickness of pipe and progressive tubing.Therefore, be used as the pipeline steel capital of this class transfer lime towards thick specification and high strength future development.21 century is the peak time that China's pneumatic tube is built.Ended for the end of the year 2010, two the large-scale pipe engineerings of gas transmission of transferring natural gas from the west to the east build up substantially, the important engineerings such as three lineman's journeys, middle remote pipe engineering of transferring natural gas from the west to the east in addition the coming years construction that will start, its main line is used X80 level steel in enormous quantities, the supporting pipe-networks engineering in branch line engineering and domestic a large amount of city needs more large batch of X70 pipe line steel, so the market demand of pipe line steel X70 can be very large.
All contain the precious alloy elements such as Mo, Ni in the chemical composition of the pipe line steel X70 that produces on the market now, at publication number CN200410066297.8, contain 0.10 ~ 0.30% Mo in the X70 pipe line steel composition system of introducing in the denomination of invention " acicular ferrite type X70 pipe line steel and manufacture method thereof with high arrest toughness ", in the X70 pipe line steel composition system that other Patents and pertinent literature are introduced, generally also all contain the precious alloy elements such as Mo, Ni.The adding of these precious alloy elements has significantly improved the cost of alloy of X70.Some chemical composition systems of pipe line steel X70 that do not contain the precious alloy elements such as Mo, Ni are comparatively complicated, and its manufacturing condition requires sternlyer, and production cost is also higher.
The price of steel industry upstream materials such as iron ore, coal sharp rises in recent years, and the steel industry production cost sharply rises.But, recent year iron and steel enterprise strengthens research and development and production dynamics, competition, under the steel market situation at home, who can take the lead in developing the production technology of high quality and low-cost pipe line steel Wide and Thick Slab X70, and who will stand on the invincible position in the domestic and international pipe line steel market competition of 21st century.
Summary of the invention:
For the problem of above-mentioned existence, the invention provides pipeline steel X 70 hot-rolled plate and the production method of a kind of Cr of containing.The pipeline steel X 70 hot-rolled plate that contains Cr that the present invention produces is less on the yield strength impact because Cr can significantly improve tensile strength, and yield tensile ratio control is good, is lower than 0.88; The present invention adopts the chemical composition system of lower cost, production contain the Cr pipeline steel X 70 hot-rolled plate, its performance is better than standard-required.Press 0.15%Mo and 0.20%Ni content and adjust, consider alloy absorption rate, ton steel cost is reduced in more than 700 yuan.
Technical scheme of the present invention is achieved in that
A kind of pipeline steel X 70 hot-rolled plate that contains Cr, components by weight percentage comprises following moiety:
C:0.030 ~ 0.080%, Mn:1.55 ~ 2.00%, Si:0.10 ~ 0.40%%, S≤0.0050%, P :≤0.015%, Nb:0.035 ~ 0.060%, Ti:0.008 ~ 0.025%, Alt:0.020 ~ 0.060%, Cr:0.15 ~ 0.30%, its surplus is Fe and inevitable impurity.
A kind of production method that contains the pipeline steel X 70 hot-rolled plate of Cr, the method comprises: top and bottom combined blown converter, LF refining, VD vacuum outgas, wide plate base continuous casting, Steckel mill are rolling, the laminar flow cooling, heat is rectified and the cold operation such as rectify, wherein,
Described wide plate base continuous casting is to utilize dynamic soft-reduction to improve the center segregation of strand: total reduction 2 ~ 3mm, depress speed 0.6～1.1mm/min;
Described Steckel mill is rolling to be may further comprise the steps:
(1) slab reheats, temperature: 1150 ~ 1280 ℃;
(2) recrystallize is rolling, temperature: 1100 ~ 1000 ℃, adopt one or more passages rolling, percentage pass reduction 〉=15%, total reduction 〉=50%;
(3) non-recrystallization is rolling, temperature: 950 ~ 760 ℃, adopt one or more passages rolling, percentage pass reduction 〉=10%, accumulated deformation rate 〉=60%;
(4) finish to gauge, temperature: 830 ~ 760 ℃;
The final cooling temperature of described laminar flow cooling is interval: 550 ~ 450 ℃, and 10 ~ 30 ℃/s of control speed of cooling.
The production method of the pipeline steel X 70 hot-rolled plate of a kind of Cr of containing of the present invention is applicable to the Steckel mill production line, also applicable traditional middle plate mill production line.
The reason of the chemical composition system that the present invention adopts is:
Carbon (C): along with carbon content increases, the strength increase of steel and toughness, welding property reduce.But because reaching its maturity of cooling controlling and rolling controlling process and micro-alloying technology is the performance of improving welded heat affecting zone (HAZ) simultaneously, the carbon content in the steel reduces gradually, and X70 pipe line steel carbon content should be advisable below 0.08%.
Manganese (Mn): Mn has solution strengthening effect, also can reduce γ-α transformation temperature, and then the refinement ferrite crystal grain.When adding 1.5% ~ 2.0%Mn, can obtain acicular ferrite structure; Mn also can improve toughness, reduce ductile-brittle transition temperature.
Silicon (Si): when steel-making generally as reductor, but also can be used as alloying element.Si enters ferrite and plays solution strengthening effect, tensile strength and the less degree that can significantly improve steel improve yield strength, but reduce to a certain extent toughness, the plasticity of steel simultaneously, Si increases the aging sensitivity of steel simultaneously, and can improve resistance to corrosion and the oxidation-resistance property of steel.
Niobium (Nb): Nb can postpone austenite recrystallization, reduce transformation temperature, the performance that obtains to require by mechanism such as solution strengthening, phase transformation strengthening, precipitation strengths.0.035 ~ 0.060%Nb steel cooperates rational rolling technology, can obtain uniform acicular ferrite structure and excellent toughness.
Chromium (Cr): along with the interpolation of Cr, tensile strength is close to straight line and rises, and the yield strength variation is less.When Cr content surpassed 0.3%, its low-temperature flexibility will obviously descend; The loss of strength that brings in order to remedy Mo, the Cr of adding 0.15 ~ 0.30%, purpose is to improve tensile strength, can suitably reduce yield tensile ratio simultaneously.
Titanium (Ti): the Ti disperse of separating out in the solidification of molten steel process of trace, tiny TiN particle can suppress growing up of austenite crystal, and a original austenite grains when preventing that slab from reheating is too grown up, and provide relatively tiny austenite structure for rolling; Two stop the heat affected zone Austenite Grain Growth when welding, improve welding property.During the Ti too high levels, the TiN particle is grown up, and loses the effect that stops grain growth; Its content is controlled at 0.008 ~ 0.030% and is advisable.
Aluminium (Al): utilize Al in refining process in steel residual oxygen be combined Al
2O
3, and in refining and casting process abundant floating, with the oxygen level in the reduce steel, can prevent that simultaneously the trace Ti that adds in the steel is combined with oxygen, in the assurance final steel a certain amount of tiny TiN particle to be arranged.
Impurity element is to the harm of pipe line steel structure property:
Sulphur (S): sulphur is one of element the most harmful in the pipe line steel, the anti-HIC of its severe exacerbation pipe line steel and SCC performance.Simultaneously, sulphur also affects the impelling strength of pipe line steel; In addition, sulphur also causes the pipe line steel anisotropy, and toughness worsens on horizontal and thickness direction; Therefore, sulphur content is the harshest index of pipe line steel requirement, and high-grade pipe line steel requires w (S) less than 0.005%.
Phosphorus (P): phosphorus is a kind of easy segregation element in pipe line steel, especially as w (P)〉during 0 .015%, the segregation of phosphorus sharply increases, and impel segregation line hardness to increase, make the HIC degradation, simultaneously, phosphorus also worsens welding property, significantly reduce the low-temperature impact toughness of steel, improve the brittle transition temperature of steel, steel pipe is occured cold short.Should strictly control phosphorus content in the steel for high-quality pipe line steel.
Production method of the present invention can crystal grain thinning, improves pipeline steel strength and toughness.
Heating steel billet makes the austenite structure homogenizing to abundant high temperature, and the carbonitride of the niobium in the steel is fully dissolved, and tiny titanium nitride does not dissolve, to stop growing up of original austenite grains.
But the fs is rolling in the temperature range of austenite recrystallize, adopts the rolling steel billet of one or more passages, and austenite accumulative total deflection is greater than 50%, by austenite recrystallization softening austenite crystal repeatedly.Subordinate phase is rolling in austenite non-recrystallization temperature range, utilize the precipitate of niobium to postpone the austenite recrystallization effect, adopt one or more passages rolling, austenite accumulative total deflection is greater than 60%, form the austenite crystal that elongates, in the austenite crystal that elongates, form a large amount of deformed belts, so that austenite increases considerably to the forming core point of ferrite transformation, the abundant ferrite crystal grain after the refinement phase transformation.Austenite non-recrystallization roll control finishing temperature is between 830 ~ 760 ℃, accelerate online cooling with the rate of cooling of 10 ~ 30 ℃/s after the steel plate finish to gauge, final cooling temperature is between 550 ~ 450 ℃, by accelerating cooling, reduce transformation temperature, promote the ferrite intragranular nucleation, ferrite crystal grain is grown up after stoping phase transformation, further refinement ferrite crystal grain obtains finally that crystal grain is tiny, the acicular ferrite structure of high density dislocation structure, improves simultaneously armor plate strength and low-temperature impact toughness.
Beneficial effect of the present invention:
A kind of pipeline steel X 70 hot-rolled plate that contains Cr that the present invention produces is compared with existing pipe line steel X70, has the following advantages:
1, adopt the chemical composition system of lower cost, the plate property of the pipeline steel X 70 hot-rolled plate that contains Cr of production can satisfy even be better than standard-required; Press 0.15%Mo and 0.20%Ni content and adjust, consider alloy absorption rate, the ton steel can be saved nickel plate 2kg and contain the molybdenum-iron 3kg of molybdenum 60%; By existing market price, ton steel cost is reduced in more than 700 yuan.
2, less on the yield strength impact because Cr can significantly improve tensile strength, the X70 Pipeline Steel Plate yield tensile ratio control that the present invention produces is good, is lower than 0.88, can satisfy even be better than standard-required.
3, production method of the present invention can crystal grain thinning, improves pipeline steel strength and toughness.
Embodiment:
The present invention is described in further detail below in conjunction with specific embodiment.
Embodiment one
Be that the pipeline steel X 70 hot-rolled plate that contains Cr of 19.1mm is example with Steckel mill production line production product specification below, the present invention is further illustrated.
The production product specification be 19.1mm contain the Cr pipeline steel X 70 hot-rolled plate, components by weight percentage comprises following moiety: C:0.07%, Si:0.20%, Mn:1.80%, P:0.009%, S:0.003%, Nb:0.050%, Ti:0.012%, Cr:0.18%, Alt:0.035%, surplus is Fe and inevitable impurity.
Operational path comprises mainly that top and bottom combined blown converter, LF refining, VD vacuum outgas, wide plate base continuous casting, Steckel mill are rolling, laminar flow cooling, heat are rectified, the cold operation such as rectify; Concrete production technique sees Table 1 embodiment one.
The Cr pipeline steel X 70 hot-rolled plate service check that contains through this explained hereafter the results are shown in Table 2.
Embodiment two
Be that the pipeline steel X 70 hot-rolled plate that contains Cr of 19.1mm is example with Steckel mill production line production product specification below, the present invention is further illustrated.Components by weight percentage, it comprises following moiety: C:0.07%, Si:0.18%, Mn:1.78%, P:0.0010%, S:0.004%, Nb:0.052%, Ti:0.014%, Cr:0.28%, Alt:0.040%, surplus is Fe and inevitable impurity.
Operational path comprises mainly that top and bottom combined blown converter, LF refining, VD vacuum outgas, wide plate base continuous casting, Steckel mill are rolling, laminar flow cooling, heat are rectified, the cold operation such as rectify; Concrete production technique sees Table 1 embodiment two.
The Cr pipeline steel X 70 hot-rolled plate service check that contains through this explained hereafter the results are shown in Table 2.
As can be seen from Table 2, embodiment one and embodiment two produce the yield strength Rp0.2 of the pipeline steel X 70 hot-rolled plate that contains Cr and tensile strength Rm than standard surplus capacity more than the 50MPa is arranged all, elongation A value is far above standard-required (with reference to the strictest the second west to east gas pipeline project standard of requirements), 0.90 ,-20 ℃ of summers that yield tensile ratio Rp0.2/Rm is starkly lower than standard-required also are better than standard-required than v-notch ballistic work and-15 ℃ of drop weight test shear area ratios.Adopt the chemical composition system of the inventive method and the complete standard-required that can satisfy and be better than the X70 Pipeline Steel Plate of steel plate of rolling technology production.
The present invention can also have other embodiment, and the technical scheme that the equal replacement of all employings or equivalent transformation form all drops within the scope of protection of present invention.
Claims (1)
1. pipeline steel X 70 hot-rolled plate that contains Cr, it is characterized in that: components by weight percentage, comprise following moiety: C:0.030 ~ 0.080%, Mn:1.55 ~ 2.00%, Si:0.10 ~ 0.40%, S≤0.0050%, P :≤0.015%, Nb:0.035 ~ 0.060%, Ti:0.008 ~ 0.025%, Alt:0.020 ~ 0.060%, Cr:0.15 ~ 0.30%, its surplus is Fe and inevitable impurity, and its production method comprises: top and bottom combined blown converter, the LF refining, the VD vacuum outgas, wide plate base continuous casting, Steckel mill is rolling, the laminar flow cooling, heat is rectified and cold strong operation
Wherein said wide plate base continuous casting is to utilize dynamic soft-reduction to improve the center segregation of strand: total reduction 2 ~ 3mm, depress speed 0.6～1.1mm/min;
Described Steckel mill is rolling to be may further comprise the steps:
(1) slab reheats, temperature: 1150 ~ 1280 ℃;
(2) recrystallize is rolling, temperature: 1100 ~ 1000 ℃, adopt one or more passages rolling, percentage pass reduction 〉=15%, total reduction 〉=50%;
(3) non-recrystallization is rolling, temperature: 950 ~ 760 ℃, adopt one or more passages rolling, percentage pass reduction 〉=10%, accumulated deformation rate 〉=60%;
(4) finish to gauge, temperature: 830 ~ 760 ℃;
The final cooling temperature of described laminar flow cooling is interval: 550 ~ 450 ℃, and 10 ~ 30 ℃/s of control speed of cooling.
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103042039B (en) * | 2013-01-05 | 2015-07-22 | 马钢(集团)控股有限公司 | Controlled rolling and cooling process for Cr-containing economic X70 pipeline hot-rolled steel coil plate |
| CN103468905B (en) * | 2013-09-06 | 2016-03-02 | 鞍钢股份有限公司 | 485 MPa-grade pipeline steel hot-rolled coil and manufacturing method thereof |
| CN104498833A (en) * | 2014-12-12 | 2015-04-08 | 本钢板材股份有限公司 | Low-cost X70 pipeline steel and rolling process thereof |
| CN105463317B (en) * | 2015-11-25 | 2018-07-03 | 武汉钢铁有限公司 | Low yield strength ratio hot rolling pipe line steel reel or opening plate and preparation method thereof |
| CN109234612B (en) * | 2018-08-20 | 2020-10-16 | 安阳钢铁股份有限公司 | High-toughness B-containing hot-rolled low-carbon bainite steel plate and production method thereof |
| CN109252089B (en) * | 2018-08-20 | 2020-11-06 | 安阳钢铁股份有限公司 | Strain design pipeline steel X65 steel plate and production method thereof |
| CN110453157A (en) * | 2019-08-01 | 2019-11-15 | 江阴兴澄特种钢铁有限公司 | A kind of manufacturing method of low yield strength ratio thin gauge pipe line steel |
| CN112143975A (en) * | 2020-09-30 | 2020-12-29 | 江苏沙钢集团有限公司 | Economical high-efficiency X70-grade pipeline steel and manufacturing method thereof |
| CN112322875B (en) * | 2020-10-10 | 2022-05-06 | 江阴兴澄特种钢铁有限公司 | Method for producing X70 pipeline steel plate with 3-8mm ultrathin specification and used under ultralow temperature condition by using curling furnace |
| CN114107816A (en) * | 2021-11-23 | 2022-03-01 | 山东钢铁集团日照有限公司 | X65 MS-grade acid-resistant pipeline steel hot-rolled coil with low cost and high strength and toughness and preparation method thereof |
| CN115739995A (en) * | 2022-09-27 | 2023-03-07 | 山东钢铁集团日照有限公司 | Low-temperature impact resistant steel produced by CVC steckel mill and preparation method and application thereof |
-
2011
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Non-Patent Citations (6)
| Title |
|---|
| X70管线钢卷板的工业化生产;张全刚等;《轧钢》;20100228;第27卷(第1期);第55-57页 * |
| 安阳宽板坯连铸机的技术装备及工艺控制;李素梅等;《河南冶金》;20060930;第14卷;第66-67页 * |
| 张全刚等.X70管线钢卷板的工业化生产.《轧钢》.2010,第27卷(第1期),第55-57页. |
| 李素梅等.安阳宽板坯连铸机的技术装备及工艺控制.《河南冶金》.2006,第14卷第66-67页. |
| 炉卷轧机X70级管线钢组织与性能研究;王春祥;《武汉科技大学学报》;20091231;第32卷(第6期);第579-582页 * |
| 王春祥.炉卷轧机X70级管线钢组织与性能研究.《武汉科技大学学报》.2009,第32卷(第6期),第579-582页. |
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