CN103160756A - Manufacturing method of pipeline steel with high strength and toughness and high deformability - Google Patents
Manufacturing method of pipeline steel with high strength and toughness and high deformability Download PDFInfo
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- CN103160756A CN103160756A CN2013101158963A CN201310115896A CN103160756A CN 103160756 A CN103160756 A CN 103160756A CN 2013101158963 A CN2013101158963 A CN 2013101158963A CN 201310115896 A CN201310115896 A CN 201310115896A CN 103160756 A CN103160756 A CN 103160756A
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Abstract
The invention discloses a manufacturing method of pipeline steel with high strength and toughness and high deformability. The steel comprises the following components in percentage by weight: 0.01-0.06% of C, 0.05-0.55% of Si, 1.60-2.00% of Mn, not more than 0.012% of P, not more than 0.005% of S, not more than 0.11% of Nb, not more than 0.06% of V, not more than 0.025% of Ti, not more than 0.0080% of N, not more than 0.50% of Cu, not more than 0.50% of Cr and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps: performing pretreatment of molten iron, smelting, refining and continuous casting to prepare a plate blank comprising the components in percentage by weight, being in line with the requirements; and manufacturing a steel plate through thermal mechanical control of rolling and control of cooling process so as to get the pipeline steel. The pipeline steel disclosed by the invention is very small in crystal grains and appropriate in soft phase-hard phase proportion and can get higher strength and toughness and excellent deformability under the situation of not containing Ni, Mo and other alloy elements and containing lower C content. The tensile strength Rm is not less than 695 and not more than 990, the yield ratio Rp0.2/Rm is not more than 0.8, the uniform deformation elongation rate is not less than 5%, and the Charpy impact energy is not less than 300J. The pipeline steel disclosed by the invention is low in cost, and the obtained steel plate has the advantages of excellent deformability, strength, toughness and excellent welding performance.
Description
Technical field
The invention belongs to ferrous materials and make the field, relate to a kind of pipe line steel, specifically a kind of pipe line steel with high-strong toughness and high deformability and preparation method thereof.
Background technology
Along with the construction of the second west to east gas pipeline project natural-gas transfer pipeline, China has obtained major progress in the development and application of X80 high-strength line-pipe steel pipe.At present, China's test section that three lines lay high grade of steels, high transfer pressure of having transferred natural gas from the west to the east is planned.This will drive improving constantly of the higher Grade Pipeline Steel manufacturing technologies such as X90, X100, and will promote thus mass production and the application of the high grade of steel welded tube of China, makes the manufacturing of China's transfer oil natural gas line steel welcome the climax of a new round.
Same pipeline tubing used, grade of the every raising of grade of steel can reduce steel using amount approximately 8 ~ 12%, and the pipeline construction total expenses can save 3 ~ 5%.But higher than the grade of steel of X80 pipe line steel, fracture toughness property requires higher, and toughness index is larger higher than the 250J difficulty, and obdurability contradiction is more outstanding.Therefore, control and to have breakthrough, the combination of strength and toughness that guarantee is higher at Composition Design and cooling controlling and rolling controlling process (TMCP).
Because pipe-line constantly extends to permafrost or seismic region, pipe line steel should have higher gross distortion ability when earthquake or geologic hazard cause various ground movement, namely should have the characteristics such as low yield strength ratio, high homogeneous deformation elongation.The types of organization of high-performance pipe line steel is generally acicular ferrite type, granular bainite type or lower bainite type, and the obdurability of steel is excellent, but deformability is relatively poor.Therefore, deformation performance, intensity and toughness restrict mutually, the more difficult balance that reaches.In addition, along with the increase of pipe line steel grade of steel, intensity index requires to increase, and alloying element Mn, Cr, Ni, Mo, Cu etc. all increase to some extent, more are prone to welding crack, cause welding property to reduce.Pipe line steel of the present invention adopts ferrite to add martensite/bainite duplex structure type, has higher deformability.
Grain refining can improve intensity and the toughness of pipe line steel simultaneously, but traditional TMCP grain refinement effect is limited, only can reach about 10 μ m.Deformation induced ferrite transformation is at Ae
3-Ar
3Temperature range in by dynamic deformation, thereby induce the tiny ferrite crystal grain that forms 1-2 μ m.Thermal deformation conditions (texturing temperature, Deformation velocity and deflection) is influential to ferrite grain size and volume integral number average.
Summary of the invention
In order to obtain the pipe line steel of excellent performance, the purpose of this invention is to provide a kind of pipe line steel with high-strong toughness and high deformability and preparation method thereof.This pipe line steel has larger homogeneous deformation elongation and lower yield tensile ratio due to the extremely tiny and suitable soft or hard phase ratio of crystal grain, thereby has the deformability higher than common pipe line steel.And can reach the balance that lower C content obtains the deformation performance of higher obdurability and excellence in the situation that do not contain the alloying elements such as Ni, Mo.This preparation method is with low cost, and the pipe line steel of preparation has excellent welding property.
The objective of the invention is to be achieved through the following technical solutions:
A kind of pipe line steel with high-strong toughness and high deformability, it is characterized in that: the component of this steel and mass percent are: C 0.01 ~ 0.06%, Si 0.05 ~ 0.55%, Mn 1.60 ~ 2.00%, P≤0.012%, S≤0.005%, Nb≤0.11%, V≤0.06%, Ti≤0.025%, N≤0.0080%, Cu≤0.50%, Cr≤0.50%, surplus are Fe and inevitable impurity.
Further optimize, the component of this steel and mass percent are: C 0.02 ~ 0.05%, Si 0.05 ~ 0.30%, Mn 1.70 ~ 1.90%, P≤0.010%, S≤0.001%, Nb≤0.08%, V≤0.03%, Ti≤0.020%, N 0.0010 ~ 0.0060%, Cu 0.10 ~ 0.30%, Cr 0.10 ~ 0.30%, surplus is Fe and inevitable impurity.
In the present invention, in steel, first-phase is ferrite, and second-phase is martensite/bainite; The first-phase percent by volume is 30 ~ 70%, and the second-phase percent by volume is 30 ~ 70%.The maximum crystal grain diameter of ferrite is less than 5 μ m.
Described tensile strength 695 with high-strong toughness and high deformability pipe line steel≤
R m≤ 990, yield tensile ratio
R P0.2/
R m≤ 0.8, homogeneous deformation elongation 〉=5%, Charpy-V impact power 〉=300J.
A kind of preparation method with pipe line steel of high-strong toughness and high deformability is specially:
1) prepare each component and the satisfactory slab of mass percent through hot metal pretreatment, smelting, refining, continuous casting; Wherein, C 0.01 ~ 0.06%, Si 0.05 ~ 0.55%, Mn 1.60 ~ 2.00%, P≤0.012%, S≤0.005%, Nb≤0.11%, V≤0.06%, Ti≤0.025%, N≤0.0080%, Cu≤0.50%, Cr≤0.50%, surplus are Fe and inevitable impurity;
2) make steel plate through the controlled rolling of heat engine tool and control process of cooling (TMCP), technique is: the roughing finishing temperature is 1000 ~ 1100 ℃, and roughing thickness direction draft is 45 ~ 65%.It is 820 ~ 860 ℃ that finish rolling begins temperature, and the roughing speed of cooling that begins to finish rolling that ends is 10 ~ 20 ℃/s, and finishing temperature is 700 ~ 720 ℃, and finish rolling thickness direction draft is 65 ~ 85%; Be chilled to 100 ~ 300 ℃ with 〉=16 ℃/s speed after hot rolling, obtain the pipe line steel with high-strong toughness and high deformability of the present invention.
The present invention utilizes deformation induced ferrite transformation generation ultra-fine grained ferrite to add martensite/bainite pipe line steel, owing to adopting duplex structure's type, make steel have larger uniform elongation and lower yield tensile ratio, thereby have the deformability higher than common pipe line steel.Simultaneously due to ferrite grain size less than 5 μ m, and martensite/bainite island size uniform is tiny, the intensity of steel is higher, low-temperature flexibility is more excellent.The present invention just can obtain high intensity and toughness in lower carbon and alloying element content situation, simultaneously, deformation performance does not reduce.
Ae in the present invention
3-Ar
3Texturizing condition and the cooling conditions of temperature range meet certain requirements, final Microstructure and properties can meet the demands.
Compared with prior art, the invention has the advantages that: 1, alloying element content is low, and do not contain Ni, the Mo element, with low cost; 2, deformation performance and combination of strength and toughness are better; 3, the preparation method is with low cost, and the pipe line steel of preparation has excellent welding property.
Embodiment
The invention will be further described below in conjunction with embodiment, but be not limited to the following example.In embodiment, the chemical composition of pipe line steel is as shown in table 1, and rolling technology is as shown in table 2, and ferrite percent by volume, crystal grain diameter and the performance of pipe line steel are as shown in table 3.
Table 1 pipe line steel composition (massfraction, %)
Table 2 pipe line steel rolling technology
Ferrite percent by volume, crystal grain diameter and the performance of table 3 pipe line steel
Embodiment 1
A kind of pipe line steel with high-strong toughness and high deformability, in target product, the massfraction of each element is as shown in embodiment in table 11.Be rolled by technique shown in embodiment in table 21.Ferrite percent by volume, crystal grain diameter and performance are as shown in embodiment in table 31.
Embodiment 2
Another has the pipe line steel of high-strong toughness and high deformability, and in target product, the massfraction of each element is as shown in embodiment in table 12.Be rolled by technique shown in embodiment in table 22.Ferrite percent by volume, crystal grain diameter and performance are as shown in embodiment in table 32.
Embodiment 3
Another has the pipe line steel of high-strong toughness and high deformability, and in target product, the massfraction of each element is as shown in embodiment in table 13.Be rolled by technique shown in embodiment in table 23.Ferrite percent by volume, crystal grain diameter and performance are as shown in embodiment in table 33.
Embodiment 4
In target product, the massfraction of each element is as shown in embodiment in table 14.Be rolled by technique shown in embodiment in table 24.Ferrite percent by volume, crystal grain diameter and performance are as shown in embodiment in table 34.
Embodiment 5
In target product, the massfraction of each element is as shown in embodiment in table 15.Be rolled by technique shown in embodiment in table 25.Ferrite percent by volume, crystal grain diameter and performance are as shown in embodiment in table 35.
Embodiment 6
In target product, the massfraction of each element is as shown in embodiment in table 16.Be rolled by technique shown in embodiment in table 26.Ferrite percent by volume, crystal grain diameter and performance are as shown in embodiment in table 36.
Embodiment 7
In target product, the massfraction of each element is as shown in embodiment in table 17.Be rolled by technique shown in embodiment in table 27.Ferrite percent by volume, crystal grain diameter and performance are as shown in embodiment in table 37.
Embodiment 8
In target product, the massfraction of each element is as shown in embodiment in table 18.Be rolled by technique shown in embodiment in table 28.Ferrite percent by volume, crystal grain diameter and performance are as shown in embodiment in table 38.
Embodiment 9
In target product, the massfraction of each element is as shown in embodiment in table 19.Be rolled by technique shown in embodiment in table 29.Ferrite percent by volume, crystal grain diameter and performance are as shown in embodiment in table 39.
Embodiment 10
In target product, the massfraction of each element is as shown in embodiment in table 1 10.Be rolled by technique shown in embodiment in table 2 10.Ferrite percent by volume, crystal grain diameter and performance are as shown in embodiment in table 3 10.
Claims (6)
1. pipe line steel with high-strong toughness and high deformability, it is characterized in that: the component of this steel and mass percent are: C 0.01 ~ 0.06%, Si 0.05 ~ 0.55%, Mn 1.60 ~ 2.00%, P≤0.012%, S≤0.005%, Nb≤0.11%, V≤0.06%, Ti≤0.025%, N≤0.0080%, Cu≤0.50%, Cr≤0.50%, surplus are Fe and inevitable impurity.
2. the pipe line steel with high-strong toughness and high deformability according to claim 1, it is characterized in that: the component of this steel and mass percent are: C 0.02 ~ 0.05%, Si 0.05 ~ 0.30%, Mn 1.70 ~ 1.90%, P≤0.010%, S≤0.001%, Nb≤0.08%, V≤0.03%, Ti≤0.020%, N 0.0010 ~ 0.0060%, Cu 0.10 ~ 0.30%, Cr 0.10 ~ 0.30%, surplus is Fe and inevitable impurity.
3. described pipe line steel with high-strong toughness and high deformability according to claim 1, it is characterized in that: in steel, first-phase is ferrite, second-phase is martensite and bainite; The first-phase percent by volume is 30 ~ 70%, and the second-phase percent by volume is 30 ~ 70%.
4. the pipe line steel with high-strong toughness and high deformability according to claim 3 is characterized in that: the maximum crystal grain diameter of ferrite is less than 5 μ m.
5. the pipe line steel with high-strong toughness and high deformability according to claim 1 is characterized in that: the tensile strength 695 of the pipe line steel of described high-strong toughness and high deformability≤
R m≤ 990, yield tensile ratio
R P0.2/
R m≤ 0.8, homogeneous deformation elongation 〉=5%, Charpy-V impact power 〉=300J.
6. manufacture method with pipe line steel of high-strong toughness and high deformability claimed in claim 1 is characterized in that the method includes the steps of:
1) prepare each component and the satisfactory slab of mass percent through hot metal pretreatment, smelting, refining, continuous casting; Wherein, C 0.01 ~ 0.06%, Si 0.05 ~ 0.55%, Mn 1.60 ~ 2.00%, P≤0.012%, S≤0.005%, Nb≤0.11%, V≤0.06%, Ti≤0.025%, N≤0.0080%, Cu≤0.50%, Cr≤0.50%, surplus are Fe and inevitable impurity;
2) make steel plate through the controlled rolling of heat engine tool and control process of cooling, technique is: the roughing finishing temperature is 1000 ~ 1100 ℃, and roughing thickness direction draft is 45 ~ 65%; It is 820 ~ 860 ℃ that finish rolling begins temperature, and the roughing speed of cooling that begins to finish rolling that ends is 10 ~ 20 ℃/s, and finishing temperature is 700 ~ 720 ℃, and finish rolling thickness direction draft is 65 ~ 85%; Be chilled to 100 ~ 300 ℃ with 〉=16 ℃/s speed after hot rolling, obtain having the pipe line steel of high-strong toughness and high deformability.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106591698A (en) * | 2016-11-25 | 2017-04-26 | 钢铁研究总院 | Low-temperature-resistant ultra-fine grain pipeline steel and manufacturing method thereof |
| CN109182917A (en) * | 2018-11-08 | 2019-01-11 | 宝钢湛江钢铁有限公司 | A kind of manufacturing method of thick-specification high-tenacity pipe line steel |
| CN110042309A (en) * | 2019-05-07 | 2019-07-23 | 南京钢铁股份有限公司 | A kind of production method improving wide surface of thin steel sheet quality |
| CN110088331A (en) * | 2016-12-19 | 2019-08-02 | Posco公司 | The electric-resistance-welded steel pipe hot rolled steel plate and its manufacturing method of welding property excellent |
| CN112126849A (en) * | 2020-08-21 | 2020-12-25 | 中国科学院金属研究所 | X90 pipeline steel with high strength and toughness and containing rare earth La and Ce elements and rolling method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101397626A (en) * | 2007-12-07 | 2009-04-01 | 江苏沙钢集团有限公司 | High intensity and high-toughness hot-rolled steel sheet and method for producing the same |
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- 2013-04-07 CN CN201310115896.3A patent/CN103160756B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101397626A (en) * | 2007-12-07 | 2009-04-01 | 江苏沙钢集团有限公司 | High intensity and high-toughness hot-rolled steel sheet and method for producing the same |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106591698A (en) * | 2016-11-25 | 2017-04-26 | 钢铁研究总院 | Low-temperature-resistant ultra-fine grain pipeline steel and manufacturing method thereof |
| CN110088331A (en) * | 2016-12-19 | 2019-08-02 | Posco公司 | The electric-resistance-welded steel pipe hot rolled steel plate and its manufacturing method of welding property excellent |
| CN110088331B (en) * | 2016-12-19 | 2021-03-23 | Posco公司 | Hot-rolled steel sheet for electric resistance welded steel pipe having excellent weldability and method for producing same |
| US11535907B2 (en) | 2016-12-19 | 2022-12-27 | Posco Co., Ltd | Hot rolled steel plate for electric resistance welded steel pipe having excellent weldability, and manufacturing method thereof |
| CN109182917A (en) * | 2018-11-08 | 2019-01-11 | 宝钢湛江钢铁有限公司 | A kind of manufacturing method of thick-specification high-tenacity pipe line steel |
| CN110042309A (en) * | 2019-05-07 | 2019-07-23 | 南京钢铁股份有限公司 | A kind of production method improving wide surface of thin steel sheet quality |
| CN112126849A (en) * | 2020-08-21 | 2020-12-25 | 中国科学院金属研究所 | X90 pipeline steel with high strength and toughness and containing rare earth La and Ce elements and rolling method thereof |
| CN112126849B (en) * | 2020-08-21 | 2022-05-31 | 中国科学院金属研究所 | X90 pipeline steel with high strength and toughness and containing rare earth La and Ce elements and rolling method thereof |
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