CN101082106A - Method for producing X65 pipe steel with low cost - Google Patents
Method for producing X65 pipe steel with low cost Download PDFInfo
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- CN101082106A CN101082106A CN 200710028175 CN200710028175A CN101082106A CN 101082106 A CN101082106 A CN 101082106A CN 200710028175 CN200710028175 CN 200710028175 CN 200710028175 A CN200710028175 A CN 200710028175A CN 101082106 A CN101082106 A CN 101082106A
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Abstract
The present invention discloses low cost process of producing X65 pipeline steel, which has reasonable metallurgical component design and is produced through EAF+LF smelting in an electric furnace, efficient continuous casting and rolling to form sheet billet and controlled cooling. The steel has components including C 0.046-0.060 wt%, Si 0.15-0.30 wt%, Mn 1.4-1.60 wt%, P 0.006-0.015 wt%, S 0.001-0.008 wt%, Nb 0.045-0.050 wt%, Ti 0.015-0.025 wt%, N 0.005-0.007 wt% and Fe and impurity for the rest. The process of the present invention can produce hot rolled X65 pipeline steel sheet coil of 6.0-10.0 mm thickness and meeting the requirement of API Spec 5L specification at low cost.
Description
Technical field
The invention belongs to the steel alloy production technical field, particularly adopt the method for electric furnace sheet billet continuous casting and rolling flow low cost production X65 pipeline with hot-rolled steel sheet and steel band.
Background technology
Pipeline steel occupies an important position in metal material field all the time, overwhelming majority of countries transfer oil, Sweet natural gas are all followed API API Spec 5L standard with steel pipe in the world at present, or propose to replenish requirement based on this and according to concrete pipe engineering needs.The hot-rolled sheet coil of using for this type of welded tube of manufacturing is referred to as pipe line steel usually.Pipe line steel has particular requirement to over-all properties, shows that intensity height, toughness height, ductile-brittle transition temperature are low, good welding performance, has certain solidity to corrosion etc.Nearly all pipe line steel all adopts Nb micro-alloyed steel or composite micro-alloyed steel at present.The steel of high intensity levels during X65 belongs in the pipe line steel series product.At present, be mainly used in the engineering construction of branch line and urban pipe network.The toughness of having relatively high expectations when satisfying requirement of strength is with the security of guaranteeing to use.
In traditional thick slab flow process, X42～X65 level pipeline pipeline steel production technology is ripe.But for bar strip continuous casting and rolling flow path, because its metallurgical characteristics difference, the R﹠D work of pipe line steel product is just at the early-stage, especially the high grade of steel pipe line steel of X65, X70.External authoritative expert thinks
[1]When electric furnace sheet billet continuous casting and rolling Nb microalloyed steel is produced on strand precipitation to separate out a large amount of yardsticks be the hundreds of nanometer even reach micron-sized macrobead and contain the starlike precipitate of Nb, this part precipitate is to suppressing the not effect of austenite recrystallization and structure refinement, thereby, this part Nb is referred to as " invalid Nb ", compare with traditional process, the steel band of desire production same levels must add 20～30% Nb more or additionally add the performance that other microalloy elements could guarantee steel band.Therefore, at electric furnace sheet billet continuous casting and rolling flow Development and Production X65 grade of steel pipe line steel, the American adopts the method for adding V or Mo, and the content of Nb is also higher simultaneously, and main component sees Table 1.The steel that adopts this method to produce, the cost height is its fatal defective.
Table 1 U.S. X65 of Nucor Iron And Steel Company pipe line steel product main component, %
| Sequence number | C | Mn | Nb | V | Ti | Mo | N |
| 1 | 0.04 | 1.25 | 0.05 | 0.05 | 0.01 | -- | -- |
| 2 | 0.045 | 0.85 | 0.07 | -- | -- | 0.30 | ≤0.009 |
| 3 | 0.045 | 1.30 | 0.07 | -- | -- | 0.30 | ≤0.009 |
Annotate: the space is represented not provide in the table
At present, also do not have bibliographical information to adopt the development of electric furnace sheet billet continuous casting and rolling flow, produce single Nb microalloying, Nb content 0.045～0.050% (Wt.%), little Ti are handled, X65 pipe line steel cheaply.
Summary of the invention
The purpose of this invention is to provide a kind of method based on electric furnace sheet billet continuous casting and rolling flow producing X 65 pipe steel with low cost, the present invention can reduce production costs satisfying on the basis of API Spec 5L standard to X65 pipe line steel performance requriements.
For reaching above-mentioned purpose, the invention provides a kind of method of producing X 65 pipe steel with low cost, this method adopts bar strip continuous casting and rolling flow path, specifically comprise electrosmelting, the refining of LF stove, sheet blank continuous casting, the continuously cast bloom soaking, high-pressure water descaling, controlled rolling, controlled chilling, the coiling technique process, at molten steel chemical ingredients scope be: C:0.046～0.060%, Si:0.15～0.30%, Mn:1.40～1.60%, P:0.006～0.015%, S:0.001～0.008%, Nb:0.045～0.050%, Ti:0.015～0.025%, N:0.005～0.007%.
In the such scheme, the sheet blank continuous casting processing parameter is: casting speed 4.0～4.8m/min, 980～1050 ℃ of strand charging temperatures; The cooling controlling and rolling controlling process parameter is: tapping temperature is 1170～1200 ℃, and start rolling temperature is 1080～1130 ℃, and finishing temperature is 840～880 ℃, strong cooling mode, and coiling temperature is 540～620 ℃.
The present invention is by rational metallurgically design, adopt the EAF+LF steel-smelting technology, using LCR is the continuous caster of 60mm, by the controlled rolling and the controlled cooling technology in 6 frame hot continuous rolling unit recrystallization zone+non-recrystallization districts, but low cost production thickness 6.0～10.0mm, meet the X65 line steel hot rolling coiled sheet of API Spec 5L standard.
Technical characterstic of the present invention comprises following several respects:
(1) solved " invalid Nb " problem
One of problem that electrosmelting brings is a molten steel N content height, generally in 0.008%～0.012% scope.According to Nb (C, solid solubility N) is long-pending, (C N) depends on established TiN epitaxy, forms yardstick and be the hundreds of nanometer even reach micron-sized macrobead to contain the starlike precipitate of Nb for Nb in the casting process as can be known.And bar strip continuous casting and rolling flow path strand soaking temperature is low than traditional process, soaking time short, and this part Nb can not dissolve fully, thereby causes part Nb can not play the effect of refined crystalline strengthening.
The present invention by N content in the control molten steel, add trace Ti with most N, high pulling rate, high soaking temperature in the fixing steel, eliminated the macrobead in the strand and contained the starlike precipitate of Nb, thereby solved " invalid Nb " problem, improved the utilization ratio of Nb.The present invention adopts single Nb micro-alloying technology, uses low Nb content, produces the X65 pipe line steel that satisfies API Spec 5L standard.
(2) make full use of the Nb micro-alloying technology
Can effectively control reheat austenite grain size, recrystallize austenite grain size and non-recrystallization deformed austenite effective grain boundary area by the Nb microalloying, thereby obtain fine grained texture to improve the intensity and the toughness of steel plate or steel band to the ferritic phase forming core.Intensity and toughness in order to improve steel must make full use of the Nb micro-alloying technology.
The present invention adopts following technology to give full play to the effect of Nb microalloying: adopt high continuous casting pulling rate, high charging temperature and high soaking temperature, make Nb before hot rolling fully solid solution to bring into play the microalloying effect of Nb to greatest extent; Improve the deflection of start rolling temperature and tandem rolling preorder frame, promote the deformed austenite recrystallize, thereby solved the homogeneity of structure problem that contains the Nb steel; After the finish to gauge, adopt strong process for cooling, impel the ferrite crystal grain refinement.
(3) adopt little Ti treatment technology
The TiN precipitation is separated out temperature, and (C, N) precipitation is separated out temperature, even under N content condition with higher the TiN liquation can take place apparently higher than Nb.Therefore, in containing the Nb steel, add a certain amount of Ti, can suppress the high temperature of part Nb and separate out; Simultaneously, TiN is a high temperature indissoluble particle, and tiny TiN particle can effectively suppress in the equal thermal process austenite crystal grows up, and can stop the heat affected zone grain growth, improves the welding property of steel, especially improves the impelling strength of weld heat-affected zone; In addition, separating out of TiN particle reduced solid solution N content in the steel, helps improving the toughness and the strain aging performance of steel.
Therefore, for microalloying effect and the welding property of improving steel, toughness and the strain aging performance of giving full play to Nb, the present invention has adopted little Ti treatment technology simultaneously on the basis of adopting Nb microalloy aurification technology.
In sum, the present invention has the following advantages:
(1) cost is low.The present invention has adopted single Nb micro-alloying technology, and the X65 pipe line steel of the Nb constituent content that uses and American's production substantially quite or lower slightly; And the American produces X65 grade of steel pipe line steel, additionally adds metals such as Mo or V, sees table 1 for details.Although adopted high Mn, little Ti treatment technology in the composition of the present invention design, the cost that causes thus increases the cost that causes far below extra interpolation Mo or V and increases.The present invention has realized electric furnace sheet billet continuous casting and rolling flow producing X 65 pipe steel with low cost.
(2) steel band excellent combination property.Utilize the Nb micro-alloying technology to improve the intensity and the toughness of steel simultaneously, thereby satisfy of the requirement of X65 pipe line steel high strength and high tenacity; Adopt little Ti treatment technology, the microalloying effect of Nb is given full play to, and improve welding property, toughness and the strain aging performance of steel.Therefore, adopt the inventive method can produce the X65 steel band of excellent combination property.
Description of drawings
Fig. 1 is the steel band organization chart of the embodiment of the invention 1;
Fig. 2 is the steel band organization chart of the embodiment of the invention 2;
Fig. 3 is the steel band organization chart of the embodiment of the invention 3.
Embodiment
The present invention will be described below to enumerate specific embodiment.Embodiment only is used for that the invention will be further described, does not represent protection scope of the present invention, and nonessential modification and adjustment that other people make according to the present invention still belong to protection scope of the present invention.
Embodiment 1
Operational path: electrosmelting → LF stove refining → sheet blank continuous casting (slab thickness 60mm) → continuously cast bloom soaking → high-pressure water descaling → controlled rolling → controlled chilling → batch.
Molten steel chemical ingredients: C:0.046%, Si:0.30%, Mn:1.40%, P:0.015%, S:0.008%, Nb:0.045%, Ti:0.025%, N:0.007%.
Continuous casting and hot rolling technology: continuous casting pulling rate: 4.8m/min, the strand charging temperature: 1050 ℃, tapping temperature: 1170 ℃, start rolling temperature: 1080 ℃, finishing temperature: 880 ℃, strong cooling mode, coiling temperature: 620 ℃.
The tissue of steel band is seen Fig. 1, and the grain fineness number and the performance of steel band see Table 1.
The grain fineness number and the performance of table 1 embodiment 1 steel band
| Thickness of strips mm | Grain fineness number ASTM level | R t0.5 MPa | Rm MPa | A 50.8 ％ | HV10 | Wide clod wash b=35mm, d=2a, 180 ° | The summer specific impulse absorbs hits merit J | Summer is than impacting shear area % |
| 6.0 | 12 | 505 | 600 | 34 | 181 | Intact | 110 | 100 |
Annotate: stretching, clod wash, impact are horizontal sampling; Impact specimen is of a size of 5.0 * 10 * 55mm; Impact test temperature is-10 ℃.
Embodiment 2
Operational path: electrosmelting → LF stove refining → sheet blank continuous casting (slab thickness 60mm) → continuously cast bloom soaking → high-pressure water descaling → controlled rolling → controlled chilling → batch.
Molten steel chemical ingredients: C:0.053%, Si:0.20%, Mn:1.50%, P:0.012%, S:0.005%, Nb:0.048%, Ti:0.020%, N:0.006%.
Continuous casting and hot rolling technology: continuous casting pulling rate: 4.5m/min, the strand charging temperature: 990 ℃, tapping temperature: 1180 ℃, start rolling temperature: 1110 ℃, finishing temperature: 860 ℃, strong cooling mode, coiling temperature: 580 ℃.The tissue of steel band is seen Fig. 2, and the grain fineness number and the performance of steel band see Table 2.
The grain fineness number and the performance of table 2 embodiment 2 steel bands
| Thickness of strips mm | Grain fineness number ASTM level | R t0.5 MPa | Rm MPa | A 50.8 ％ | HV10 | Wide clod wash b=35mm, d=2a, 180 ° | The summer specific impulse absorbs hits merit J | Summer is than impacting shear area % |
| 8.8 | 12 | 515 | 610 | 35 | 174 | Intact | 105 | 100 |
Annotate: stretching, clod wash, impact are horizontal sampling; Impact specimen is of a size of 5.0 * 10 * 55mm; Impact test temperature is-10 ℃.
Embodiment 3
Operational path: electrosmelting → LF stove refining → sheet blank continuous casting (slab thickness 60mm) → continuously cast bloom soaking → high-pressure water descaling → controlled rolling → controlled chilling → batch.
Molten steel chemical ingredients: C:0.060%, Si:0.15%, Mn:1.60%, P:0.006%, S:0.001%, Nb:0.050%, Ti:0.015%, N:0.005%.
Continuous casting and hot rolling technology: continuous casting pulling rate: 4.0m/min, the strand charging temperature: 980 ℃, tapping temperature: 1200 ℃, start rolling temperature: 1130 ℃, finishing temperature: 840 ℃, strong cooling mode, coiling temperature: 540 ℃.
The tissue of steel band is seen Fig. 3, and the grain fineness number and the performance of steel band see Table 3.
The grain fineness number and the performance of table 3 embodiment 3 steel bands
| Thickness of strips mm | Grain fineness number ASTM level | R t0.5 MPa | Rm MPa | A 50.8 ％ | HV10 | Wide clod wash b=35mm, d=2a, 180 ° | The summer specific impulse absorbs hits merit J | Summer is than impacting shear area % |
| 10.0 | 11.5 | 495 | 595 | 37 | 170 | Intact | 110 | 98 |
Annotate: stretching, clod wash, impact are horizontal sampling; Impact specimen is of a size of 5.0 * 10 * 55mm; Impact test temperature is-10 ℃.
Claims (3)
1. the method for a producing X 65 pipe steel with low cost, this method adopts bar strip continuous casting and rolling flow path, specifically comprise electrosmelting, the refining of LF stove, sheet blank continuous casting, continuously cast bloom soaking, high-pressure water descaling, controlled rolling, controlled chilling, coiling technique process, it is characterized in that at molten steel chemical ingredients scope be: C:0.046～0.060%, Si:0.15～0.30%, Mn:1.40～1.60%, P:0.006～0.015%, S:0.001～0.008%, Nb:0.045～0.050%, Ti:0.015～0.025%, N:0.005～0.007%.
2. the method for producing X 65 pipe steel with low cost according to claim 1 is characterized in that the sheet blank continuous casting processing parameter is: casting speed 4.0～4.8m/min, 980～1050 ℃ of strand charging temperatures.
3. the method for producing X 65 pipe steel with low cost according to claim 1, it is characterized in that the cooling controlling and rolling controlling process parameter is: tapping temperature is 1170～1200 ℃, and start rolling temperature is 1080～1130 ℃, and finishing temperature is 840～880 ℃, strong cooling mode, coiling temperature is 540～620 ℃.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100569404C (en) * | 2007-12-18 | 2009-12-16 | 本钢板材股份有限公司 | The method of rolled high niobium pipeline steel |
| CN102154587A (en) * | 2011-05-25 | 2011-08-17 | 莱芜钢铁集团有限公司 | Pipe line steel for high linear energy welding and manufacturing method thereof |
| CN102851599A (en) * | 2011-06-28 | 2013-01-02 | 鞍钢股份有限公司 | Thick-wall low-cost X65 hot rolled coil for spiral welded tubing and manufacture method thereof |
| CN102899559A (en) * | 2012-10-12 | 2013-01-30 | 吉林建龙钢铁有限责任公司 | Preparation method of steel for oil delivery pipeline |
| CN103014512A (en) * | 2012-12-25 | 2013-04-03 | 内蒙古包钢钢联股份有限公司 | Pipeline steel and low cost method for rolling pipeline steel |
| CN103160746A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | High strength steel for thick wall water pipe and manufacturing method thereof |
| CN107363094A (en) * | 2016-05-12 | 2017-11-21 | 鞍钢股份有限公司 | A kind of Thin Specs pipe line steel milling method |
| CN109014100A (en) * | 2018-09-29 | 2018-12-18 | 东北大学 | A method of it improving steel thin plate base continuous casting process and draws steel speed |
| CN109385576A (en) * | 2017-08-04 | 2019-02-26 | 上海梅山钢铁股份有限公司 | A kind of inexpensive X65 pipe line steel and its manufacturing method based on magnesium processing |
| CN111996461A (en) * | 2020-09-07 | 2020-11-27 | 鞍钢股份有限公司 | X70 pipeline coiled plate for microalloyed resistance welded pipe and production method thereof |
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2007
- 2007-05-24 CN CN2007100281753A patent/CN101082106B/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100569404C (en) * | 2007-12-18 | 2009-12-16 | 本钢板材股份有限公司 | The method of rolled high niobium pipeline steel |
| CN102154587A (en) * | 2011-05-25 | 2011-08-17 | 莱芜钢铁集团有限公司 | Pipe line steel for high linear energy welding and manufacturing method thereof |
| CN102851599A (en) * | 2011-06-28 | 2013-01-02 | 鞍钢股份有限公司 | Thick-wall low-cost X65 hot rolled coil for spiral welded tubing and manufacture method thereof |
| CN102851599B (en) * | 2011-06-28 | 2015-06-03 | 鞍钢股份有限公司 | Thick-wall low-cost X65 hot rolled coil for spiral welded tubing and manufacture method thereof |
| CN103160746A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | High strength steel for thick wall water pipe and manufacturing method thereof |
| CN102899559A (en) * | 2012-10-12 | 2013-01-30 | 吉林建龙钢铁有限责任公司 | Preparation method of steel for oil delivery pipeline |
| CN103014512A (en) * | 2012-12-25 | 2013-04-03 | 内蒙古包钢钢联股份有限公司 | Pipeline steel and low cost method for rolling pipeline steel |
| CN103014512B (en) * | 2012-12-25 | 2015-09-30 | 内蒙古包钢钢联股份有限公司 | The method of low cost rolling pipe line steel |
| CN107363094A (en) * | 2016-05-12 | 2017-11-21 | 鞍钢股份有限公司 | A kind of Thin Specs pipe line steel milling method |
| CN107363094B (en) * | 2016-05-12 | 2019-02-26 | 鞍钢股份有限公司 | A kind of thin gauge pipe line steel milling method |
| CN109385576A (en) * | 2017-08-04 | 2019-02-26 | 上海梅山钢铁股份有限公司 | A kind of inexpensive X65 pipe line steel and its manufacturing method based on magnesium processing |
| CN109014100A (en) * | 2018-09-29 | 2018-12-18 | 东北大学 | A method of it improving steel thin plate base continuous casting process and draws steel speed |
| CN109014100B (en) * | 2018-09-29 | 2020-03-31 | 东北大学 | Method for improving steel drawing speed in steel sheet billet continuous casting process |
| CN111996461A (en) * | 2020-09-07 | 2020-11-27 | 鞍钢股份有限公司 | X70 pipeline coiled plate for microalloyed resistance welded pipe and production method thereof |
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