CN106544587A - The big wall thickness deep-sea pipeline hot rolled steel plate of continuous casting billet and its production method - Google Patents
The big wall thickness deep-sea pipeline hot rolled steel plate of continuous casting billet and its production method Download PDFInfo
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
A kind of big wall thickness deep-sea pipeline hot rolled steel plate of continuous casting billet and its production method, belong to technical field of pipeline steel.Hot rolled steel plate chemical ingredients by weight percent is：C：0.03～0.06%, Si：0.15～0.30%, Mn：1.20～1.35%, P：≤ 0.010%, S：≤ 0.0012%, Alt：0.01～0.05%, Nb：0.03～0.05%, V：0.00～0.05%, Ti：0.005～0.016%, Ni：0.25～0.40%, Cr：0.00～0.30%, Cu：0.00～0.20%, Mo：0.00～0.15%, balance of Fe and inevitable impurity element；Using 400mm thickness continuous casting billets, 41～48mm thickness steel plates are produced.Advantage is, obtain good metallographic structure, -20 DEG C of Charpy impact toughness of big wall thickness deep-sea pipeline hot rolled steel plate, -20 DEG C of toughness of dropping hammer, low yield strength ratio, high uniform elongation, Resisting fractre toughness CTOD, solution A Antacid effectiveness HIC and SSCC etc. are solved, to meet the construction of deepwater field feed-line.
Description
Technical field
The invention belongs to technical field of pipeline steel, the big wall thickness deep-sea pipeline hot rolled steel plate of more particularly to a kind of continuous casting billet and
Its production method.Product has low yield strength ratio, high uniform elongation, excellent low-temperature flexibility, fracture toughness, and acid-resisting
Can, it is adaptable to the construction of deepwater field feed-line.
Background technology
Along with the enforcement of national marine strategy power, petroleum resources exploitation starts to ocean to extend, especially deep-sea ground
Area.According to statistics, the waters for being less than 200m in the depth of water only has the petroleum reserves of 28,000,000,000 t, and is more than the deep deep sea waters of 200m, estimates
Reserves of oil amount is counted up to 300,000,000,000 t.By the end of 2015, deepwater oilfield yield reached the 25% of all marine yield, ocean
The yield of natural gas will continue increase to the year two thousand twenty, most be close to half of whole world gas production or so at last, and this will draw
The investment risen in natural gas infrastructure increases, and natural gas infrastructure construction needs substantial amounts of submerged pipeline, especially greatly
Wall thickness deep-sea pipeline.
Different from continental line, seabed high pressure, surge, whirlpool are swashed etc., and rugged environment condition is proposed to submerged pipeline and compares land
The tightened up prescription of upper pipeline, it is desirable to which material has high intensity, low yield strength ratio, high tenacity, Resisting fractre, resistance to deformation, corrosion resistant
Erosion etc..By taking certain world-class deep water Natural Gas Projects as an example, project requires very high, -20 DEG C of CVN values to the fracture toughness of tubing
Requirement >=160J, -20 DEG C of DWTT require >=85%, -20 DEG C of CTOD index requests >=0.2mm, solution A Antacid effectiveness HIC
And SSCC, also require that tubing has anti-deformation.
The deepwater field developed in the range of our times is generally in the waters of depth of water 1500-2500m, and generation at present
The deep-sea project depth capacity planned in the range of boundary has reached 3500m, and the pipe line steel wall thickness of needs has been up to 41-
48mm.But with the increase of steel plate thickness, cause overall compression ratio to reduce, center portion deformation permeates difficult, the group of surface of steel plate and center portion
Inhomogeneities increase is knitted, the fracture toughness index and corrosion-resistant index proposed to tubing is extremely difficult to standard requirement, therefore, big wall
Thick deep-sea pipeline is the big bottleneck for restricting deep-sea oil gas pipe-line construction.
The content of the invention
It is an object of the invention to provide a kind of big wall thickness deep-sea pipeline hot rolled steel plate of continuous casting billet and its production method, solution
Determine -20 DEG C of Charpy impact toughness of big wall thickness deep-sea pipeline hot rolled steel plate, -20 DEG C of drop hammer DWTT toughness, low yield strength ratio, height
Uniform elongation, Resisting fractre toughness CTOD, solution A Antacid effectiveness HIC and SSCC etc., to meet deepwater field feed-line
Build.
The present invention the big wall thickness deep-sea pipeline hot rolled steel plate chemical ingredients by weight percent of continuous casting billet be：C：0.03～
0.06%, Si：0.15～0.30%, Mn：1.20～1.35%, P：≤ 0.010%, S：≤ 0.0012%, Alt：0.01～
0.05%, Nb：0.03～0.05%, V：0.00～0.05%, Ti：0.005～0.016%, Ni：0.25～0.40%, Cr：
0.00～0.30%, Cu：0.00～0.20%, Mo：0.00～0.15%, balance of Fe and inevitable impurity element；Use
400mm thickness continuous casting billets, produce 41～48mm thickness steel plates；
The steel mechanical property is：Yield tensile ratio≤0.80 of horizontal and vertical tensile property, uniform elongation UEL >=7%；It is horizontal
More than 400J is reached to -20 DEG C of Charpy-V impact powers, -37 DEG C of thinning DWTT sample sections of shear of dropping hammer reach more than 85%；-20℃
When CTOD values in more than 0.2mm；Under the conditions of solution A, antiacid crack length rate CLR≤15%, crack thickness rate CTR≤5%, split
Stricture of vagina Sensitivity rate CSR≤2%, surface is without SSCC crackles.
The processing step and the technology of control of the production method of the big wall thickness deep-sea pipeline hot rolled steel plate of continuous casting billet of the present invention
Parameter is as follows：
1) continuous casting working procedure adopts slab CC machine, be casting continuously to form thickness be 400mm steel billet, continuous casting billet pulling rate be 0.60～
0.75m/min, finished steel plate width/continuous casting billet width are 1.0～1.2；
2) steel billet is through 1140～1170 DEG C of reheating, 6～8 hours total heat time heating times of steel billet, steel billet soaking time 40
～70min；
3) then carry out two benches controlled rolling and control it is cold, roughing broadening stage total reduction be 0～18%, the roughing axial rolling stage
Total reduction is 54～65%, and roughing axial rolling stage reduction ratio increases by passage, roughing last percentage pass reduction is 20～
25%, the finishing temperature in finish rolling stage is 800～830 DEG C；Final cooling temperature is 300～400 DEG C；
4) stacking slow cooling, heap cool time 8-12 hours are carried out after steel plate cooling.
The composition main points of present invention are based on following understanding：
C element affects very big to the low-temperature flexibility and Antacid effectiveness of material, has carried out lot of experiments in the present invention, has sent out
It is existing：When C content is more than 0.06%, the segregation of C can cause continuous casting billet center segregation serious, affect the low-temperature flexibility of steel plate and resist
Acid energy；But when C content is less than 0.03%, strength character level is again low.Therefore in the present invention C content control 0.03～
In the range of 0.06%.
Mn elements are easy segregation elements, and Mn contents are too high, can aggravate the center segregation of continuous casting billet, have a strong impact on low-temperature flexibility
And Antacid effectiveness, Mn contents are too low, and not enough, yield tensile ratio is higher for the tensile strength of material.Therefore, the present invention is obtained through lot of experiments
Go out, Mn is controlled in 1.20～1.35% scopes, it is ensured that the good center segregation level of continuous casting billet, and Antacid effectiveness HIC is had
Profit, while ensureing the intensity level of material.
P, S element is impurity element in steel, and easily segregation, affects continuous casting billet internal soundness, and P, S content is more low better, is
The good low-temperature flexibility of acquisition and Antacid effectiveness, the present invention have carried out lot of experiments, it is found that impurity element is controlled in P：≤
0.010%, S：≤ 0.0012%, the low-temperature flexibility, solderability to product, especially Antacid effectiveness is beneficial, too high P, S content
Center segregation can be aggravated, low-temperature flexibility DWTT, CTOD and Antacid effectiveness HIC is had a strong impact on, therefore, it is necessary to strictly control P, S contain
Amount.
Nb elements have carried out lot of experiments in the present invention, find：When Nb contents are more than 0.05%, due to refined crystalline strengthening
And precipitation strength, yield strength is too high, and the yield tensile ratio of Pipeline Steel Plate can be made higher, it is impossible to reach≤0.80 requirement, Er Qieyong
Family is in welding process, it may appear that the low-temperature flexibility fluctuation problem of Seam and heat effected zone.Therefore Nb contents control in the present invention
In the range of 0.03～0.05%.
Ti elements have carried out lot of experiments in the present invention, find：When Ti contents be more than 0.016% when, particle size compared with
Big TiN particles can affect low-temperature flexibility DWTT and CTOD of material, and Antacid effectiveness HIC etc..Therefore in the present invention, Ti contains
Amount control is in the range of 0.005～0.016%.
Ni elements are stabilization of austenite elements, can reduce γ → α transition temperatures, and the low temperature that can effectively improve pipe line steel is tough
Property.Ni can improve the intensity of steel by solution strengthening effect, under the intensity caused because of the increase of thickness in making up think gauge steel
Drop, the present invention have carried out lot of experiments, find when Ni contents are more than 0.25%, its -20 DEG C of low temperature block hammer performances and -20 DEG C
Fracture toughness CTOD is functional, and Ni general controls are in the range of 0.25～0.40%.
Cr elements are effective to the tensile strength for improving pipe line steel, can significantly reduce the yield tensile ratio of material.But it is higher
Cr contents can be unfavorable to low-temperature flexibility.Therefore the control of Cr contents is in the range of 0.00～0.30%.
Cu elements are effective to the tensile strength for improving pipe line steel, can significantly reduce the yield tensile ratio of material.But it is higher
Cu contents can affect welding performance.Therefore the control of Cu contents is in the range of 0.00～0.20%.
Mo elements are effective to the tensile strength for improving pipe line steel, can significantly reduce the yield tensile ratio of material.But it is higher
Mo contents can affect Antacid effectiveness.Therefore the control of Mo contents is in the range of 0.00～0.15%.
The present invention using the foundation of the production method is：Adopt the steel billet for thickness being casting continuously to form for 400mm, can improve total compression
Than it is 0.60～0.75m/min to control continuous casting billet pulling rate, can improve continuous casting billet internal soundness, and center segregation is good, is follow-up steel
The low temperature block hammer performance of plate, CTOD performances and Antacid effectiveness lay the foundation, and control finished steel plate width/continuous casting billet width for 1.0
～1.2, it is possible to reduce roughing broadening passage, the total reduction in roughing axial rolling stage is improved, center portion crystal grain is refined, is improved thickness side
To structural homogenity, low temperature block hammer performance, CTOD performances and Antacid effectiveness of steel plate etc. are improved；Steel billet is through 1140～1170 DEG C
Reheating, 6～8 hours total heat time heating times of steel billet, steel billet 40～70min of soaking time, it is ensured that heating steel billet is uniform, while
Control austenite grain size；Then carry out two benches controlled rolling and control is cold, roughing broadening stage total reduction is 0～18%, slightly
It is 54～65% to roll axial rolling stage total reduction, and roughing axial rolling stage reduction ratio increases by passage, the last a time pressure of roughing
Rate is 20～25%, refines center portion crystal grain, improves thickness direction structural homogenity, improves low temperature block hammer performance, the CTOD of steel plate
Performance and Antacid effectiveness etc., the finishing temperature in finish rolling stage is 800～830 DEG C；Final cooling temperature is 300～400 DEG C, is obtained with thin
Tissue morphology based on little, uniform polygonal ferrite, hence it is evident that improve the low yield strength ratio of steel plate, high uniform elongation, improves
The low temperature block hammer performance of steel plate, CTOD performances and Antacid effectiveness etc.；Stacking slow cooling is carried out after steel plate cooling, cool time 8-12 is little for heap
When, residual stress and hydrogen etc. are discharged, the combination property of steel plate is improved.
It is an advantage of the current invention that being produced by the chemical composition and the technological process of production of deep-sea pipeline hot rolled steel plate
A kind of big wall thickness deep-sea pipeline, obtain good metallographic structure, solve big wall thickness deep-sea pipeline hot rolled steel plate -20
DEG C Charpy impact toughness, -20 DEG C of toughness of dropping hammer, low yield strength ratio, high uniform elongation, Resisting fractre toughness CTOD, solution As are antiacid
Performance HIC and SSCC etc., to meet the construction of deepwater field feed-line.
Description of the drawings
Metallographic structure photo figures of the Fig. 1 for deep-sea pipeline hot rolled steel plate.
Scanning macrograph figures of the Fig. 2 for deep-sea pipeline hot rolled steel plate.
Specific embodiment
Embodiment 1～5
First, embodiment mesopelagic (200 meter Dao1000 meter Shui Shen) pipeline is as shown in table 1 below with hot rolled steel plate chemical composition：
1 steel plate chemical composition (wt%) of table
Above example is chemical component weight percentage ratio, and surplus is Fe and inevitable impurity element.
2nd, embodiment process system is as shown in table 2 below：
Embodiment mesopelagic (200 meter Dao1000 meter Shui Shen) pipeline hot rolled steel plate is casting continuously to form 400mm thickness steel billets first, then through reheating, two benches
Controlled rolling, control are cold, and stacking slow cooling is processed, and obtain tiny, uniform polygonal ferrite tissue, finished steel plate thickness 41-48mm.
2 embodiment process system of table
3rd, embodiment mechanical property is as shown in table 3 below：
The deep-sea pipeline hot rolled steel plate of the production of embodiment 1～5, checks its mechanical property to be shown in Table 3.
3 embodiment mechanical property of table
The deep-sea pipeline hot rolled steel plate of the production of embodiment 1～5, carries out HIC tests by the regulation of NACE TM0284, tries
Solution is tested for solution A, cracking breakout is 0；SSCC tests are carried out by the regulation of NACE TM 0177, is seen after sample is amplified 10 times
Examine, surface is without SSCC crackles.
Many experimental results of the present invention show that steel plate chemical composition, preparation technology are most important to product mechanical property, solution
Determined the yield tensile ratio of big wall thickness deep-sea pipeline hot rolled steel plate, high uniform elongation, low-temperature impact toughness, low temperature block hammer performance,
CTOD performances and Antacid effectiveness, are capable of achieving deepwater field through engineering approaches application.
Claims (2)
1. a kind of continuous casting billet produces big wall thickness deep-sea pipeline hot rolled steel plate, it is characterised in that chemical ingredients by weight percent is：
C：0.03～0.06%, Si：0.15～0.30%, Mn：1.20～1.35%, P：≤ 0.010%, S：≤ 0.0012%, Alt：
0.01～0.05%, Nb：0.03～0.05%, V：0.00～0.05%, Ti：0.005～0.016%, Ni：0.25～
0.40%, Cr：0.00～0.30%, Cu：0.00～0.20%, Mo：0.00～0.15%, balance of Fe and inevitable impurity
Element；Using 400mm thickness continuous casting billets, 41～48mm thickness steel plates are produced；
The steel mechanical property is：Yield tensile ratio≤0.80 of horizontal and vertical tensile property, uniform elongation UEL >=7%；Laterally-
20 DEG C of Charpy-V impact powers reach more than 400J, and -37 DEG C of thinning DWTT sample sections of shear of dropping hammer reach more than 85%；When -20 DEG C
CTOD values are in more than 0.2mm；Under the conditions of solution A, HIC crack length rate CLR≤15%, crack thickness rate CTR≤5%, crackle
Sensitivity rate CSR≤2%, without SSCC crackles.
2. the production method of the big wall thickness deep-sea pipeline hot rolled steel plate described in a kind of claim 1, it is characterised in that concrete to walk
Rapid and parameter is as follows：
1) continuous casting working procedure adopts slab CC machine, is casting continuously to form the steel billet that thickness is 400mm, and continuous casting billet pulling rate is 0.60～0.75m/
Min, finished steel plate width/continuous casting billet width are 1.0～1.2；
2) steel billet is through 1140～1170 DEG C of reheating, 6～8 hours total heat time heating times of steel billet, and steel billet soaking time 40～
70min；
3) then carry out two benches controlled rolling and control it is cold, roughing broadening stage total reduction be 0～18%, roughing axial rolling stage stagnation pressure
Lower rate is 54～65%, and roughing axial rolling stage reduction ratio increases by passage, and last percentage pass reduction of roughing is 20～25%, essence
The finishing temperature for rolling the stage is 800～830 DEG C；Final cooling temperature is 300～400 DEG C；
4) stacking slow cooling, heap cool time 8-12 hours are carried out after steel plate cooling.
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Cited By (7)
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| CN108315649A (en) * | 2018-04-02 | 2018-07-24 | 首钢集团有限公司 | Continuous casting billet produces big wall thickness ultralow temperature pipe fitting steel plate and preparation method thereof |
| CN109023045A (en) * | 2018-08-02 | 2018-12-18 | 邯郸钢铁集团有限责任公司 | A kind of highly resistance H2The production method of S corrosion oil well casing J55 |
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