CN109811258A - A kind of deep-sea acid-resistant pipeline steel and milling method - Google Patents
A kind of deep-sea acid-resistant pipeline steel and milling method Download PDFInfo
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Abstract
The invention discloses a kind of deep-sea acid-resistant pipeline steels, it is related to metallurgical technology field, its chemical component and mass percent are as follows: C:0.020%~0.040%, Si:0.30%~0.40%, Mn:1.00%~1.20%, P≤0.010%, S≤0.0010%, Nb:0.030%~0.040%, Ti:0.010%~0.030%, Ni:0.20%~0.30%, Cr:0.10%~0.30%, Mo:0.10%~0.20%, Cu≤0.010%, V≤0.010%, Al:0.015%~0.050%, Ceq:0.25%~0.38%, Pcm:0.10%~0.17%, surplus Fe And impurity.The present invention is effectively reduced banded structure to the adverse effect of product, develops the antiacid pipeline steel in deep-sea.
Description
Technical field
The present invention relates to metallurgical technology fields, more particularly to a kind of deep-sea acid-resistant pipeline steel and milling method.
Background technique
Petroleum-based energy is most important for national economic development, and with the increase of oil demand amount, marine petroleum development is obtained
To the support of various countries, deep-sea oil transport not only transports that rhythm is slow, freight volume is few and pollution environment using shipping, therefore, exploitation
Deep-sea oil pipeline transportation is the direction of future development, and pipelines in deep sea is influenced by utilizing ocean current, bears the pressure from different directions
Power, it is high to pipeline base material quality requirement.
Antiacid anti-corrosion pipe line steel is mainly hic resistance, SSC performance, and hydrogen sulfide is a kind of faintly acid electrolyte, is 1~5 in pH
Aqueous solution in mainly exist in the form of molecular state, corrosion reaction: H occurs for hydrogen sulfide and metal2S+Fe → FeS+2H generates former
Sub- hydrogen, H2S is combined into the poisonous agent of hydrogen molecule as hydrogen, so that atomic hydrogen easily enters the matrix of steel.It is former into the hydrogen in steel
Son reaches fault location by diffusion, and is precipitated into hydrogen molecule, generates very high pressure.It is (outer in tensile stress in the presence of having stress
It is adding or/and remaining) under effect, three Xiang Laying that hydrogen is provided in metallurgical imperfection (be mingled with, crystal boundary, phase boundary, dislocation, crackle etc.)
The enrichment of power area, when the hydrogen concentration of segregation reaches critical value, high strength steel, high internal stress component etc. will be in hydrogen and stress fields
It cracks under synergy.Therefore, how effectively to mitigate banded structure is that improvement product deep-sea is antiacid resistance to the adverse effect of product
The key point of corrosion energy.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of deep-sea acid-resistant pipeline steel, chemical component and quality hundred
Divide ratio as follows: C:0.020%~0.040%, Si:0.30%~0.40%, Mn:1.00%~1.20%, P≤0.010%, S≤
0.0010%, Nb:0.030%~0.040%, Ti:0.010%~0.030%, Ni:0.20%~0.30%, Cr:0.10%~0.30%,
Mo:0.10%~0.20%, Cu≤0.010%, V≤0.010%, Al:0.015%~0.050%, Ceq:0.25%~0.38%, Pcm:
0.10%~0.17%, surplus is Fe and impurity.
Technical effect: the present invention is according to properties of product requirement, scientific design product composition, using low temperature austenitizing technique
Effective thinning microstructure grain size, optimizes water-cooling process, improves the adverse effect of banded structure, develops the antiacid pipeline in deep-sea and uses
Steel plate.The present invention is designed using low Carbon Manganese, is alleviated the influence of slab center portion segregation, is properly added chrome molybdenum and increases through hardening
Property, it by low temperature austenitizing technique, has refined and has rolled plate core structure grain size, increased and roll plate core structure consistency, had
Effect prevents sour gas to corrode channel, rolling mill practice and temperature spot setting, is effectively reduced banded structure adverse effect, simultaneously
The tissue based on quasi- shape changeable ferrite, bainite has been obtained by rolling and cooling technology, the toughness of product has been increased, reaches
To the requirement for meeting deep-sea military service.Therefore this realizes the antiacid corrosion resisting property requirement in product deep-sea, and economic effect greatly improved
Benefit.
The technical solution that the present invention further limits is:
A kind of preceding deep-sea acid-resistant pipeline steel, chemical component and mass percent are as follows: C:0.023%, Si:0.33%,
Mn:1.18%, P:0.009%, S:0.009%, Nb:0.036%, Ti:0.015%, Ni:0.23%, Cr:0.23%, Mo:0.18%, Cu:
0.002%, V:0.002%, Al:0.036%, Ceq:0.25%~0.38%, Pcm:0.10%~0.17%, surplus are Fe and impurity.
A kind of preceding deep-sea acid-resistant pipeline steel, chemical component and mass percent are as follows: C:0.036%, Si:
0.38%, Mn:1.08%, P:0.0006%, S:0.006%, Nb:0.033%, Ti:0.015%, Ni:0.26%, Cr:0.15%, Mo:
0.16%, Cu:0.002%, V:0.002%, Al:0.039%, Ceq:0.25%~0.38%, Pcm:0.10%~0.17%, surplus Fe
And impurity.
A kind of preceding deep-sea acid-resistant pipeline steel, chemical component and mass percent are as follows: C:0.036%, Si:
0.38%, Mn:1.08%, P:0.006%, S:0.006%, Nb:0.033%, Ti:0.015%, Ni:0.26%, Cr:0.15%, Mo:
0.16%, Cu:0.002%, V:0.002%, Al:0.039%, Ceq:0.296%, Pcm:0.128%, surplus are Fe and impurity.
Another object of the present invention is to provide a kind of deep-sea acid-resistant pipeline steel milling method, 1110 DEG C of austenitizing temperature
~1120 DEG C；In the operation of rolling, breaking down temperature is set as 1060 DEG C~1090 DEG C, the breaking down stage be averaged roll-force 50000kN~
60000kN, average drafts about 28mm, breaking down stage final reduction rate are greater than 25%；820 DEG C of finish rolling start rolling temperature setting~
850 DEG C, 830 DEG C~850 DEG C of finishing temperature；Enter coolant-temperature gage and set 780 DEG C~800 DEG C, steel plate goes out cooling system after rolling
400 DEG C~500 DEG C of temperature.
A kind of preceding deep-sea acid-resistant pipeline steel milling method, S1, austenitizing temperature are 1115 DEG C, and effectively refinement is former
Beginning tissue grain size；
S2, breaking down temperature set 1075 DEG C, and the control of breaking down roll-force is in 50000kN~60000kN, average drafts 28mm, really
It protects in the operation of rolling and sufficient dynamic recrystallization occurs, breaking down stage final reduction rate is greater than 25%；The setting of finish rolling start rolling temperature
839 DEG C, 843 DEG C of finishing temperature, zerolling is conducive to that Static Recrystallization, by the improvement of rolling mill practice, obtained group occurs
More uniform densification is knitted, while needle-shaped iron cellulose content is more；
S3, enter 792 DEG C of coolant-temperature gage setting, cooled down after rolling by ultrafast, steel plate goes out cooling system temperature 461
℃；
Steel plate after S4, rolling is sheared after being cooled down by cold bed, head-stamp is put in storage.
A kind of preceding deep-sea acid-resistant pipeline steel milling method, S1, austenitizing temperature are 1118 DEG C, and effectively refinement is former
Beginning tissue grain size；
S2, breaking down temperature set 1078 DEG C, and the control of breaking down roll-force is in 50000kN~60000kN, average drafts 28mm, really
It protects in the operation of rolling and sufficient dynamic recrystallization occurs, breaking down stage final reduction rate is greater than 25%；The setting of finish rolling start rolling temperature
831 DEG C, 839 DEG C of finishing temperature, zerolling is conducive to that Static Recrystallization, by the improvement of rolling mill practice, obtained group occurs
More uniform densification is knitted, while needle-shaped iron cellulose content is more；
S3, enter 786 DEG C of coolant-temperature gage setting, cooled down after rolling by ultrafast, steel plate goes out cooling system temperature 469
℃；
Steel plate after S4, rolling is sheared after being cooled down by cold bed, head-stamp is put in storage.
A kind of preceding deep-sea acid-resistant pipeline steel milling method, S1, austenitizing temperature are 1113 DEG C, and effectively refinement is former
Beginning tissue grain size；
S2, breaking down temperature set 1068 DEG C, and the control of breaking down roll-force is in 50000kN~60000kN, average drafts 28mm, really
It protects in the operation of rolling and sufficient dynamic recrystallization occurs, breaking down stage final reduction rate is greater than 25%；The setting of finish rolling start rolling temperature
826 DEG C, 831 DEG C of finishing temperature, zerolling is conducive to that Static Recrystallization, by the improvement of rolling mill practice, obtained group occurs
More uniform densification is knitted, while needle-shaped iron cellulose content is more；
S3, enter 783 DEG C of coolant-temperature gage setting, cooled down after rolling by ultrafast, steel plate goes out cooling system temperature 482
℃；
Steel plate after S4, rolling is sheared after being cooled down by cold bed, head-stamp is put in storage.
The beneficial effects of the present invention are:
(1) present invention has refined mainly by austenitic temperature technique and has rolled plate core structure grain size, increased and roll plate center portion group
Consistency is knitted, effectively prevents sour gas to corrode channel, improves steel plate hic resistance, SSC performance；
(2) the breaking down stage cooperates big roll-force in the present invention, it is ensured that sufficient dynamic recrystallization occurs in the operation of rolling；
(3) the finish rolling stage uses zerolling in the present invention, is conducive to that Static Recrystallization occurs；
(4) present invention is set by reasonable temperature control plate blank, breaking down, the big roll-force means of finish rolling, and plate center portion deformation ratio is rolled in raising, is had
Effect improves center portion regional organization consistency, is used cooperatively cooling system and cooling technique point, it is unfavorable to improve center portion banded structure
Influence, raising roll plate hic resistance SSC performance requirement.
Detailed description of the invention
Fig. 1 is the obtained steel plate of embodiment 1 typical organizational topography under metallographic microscope；
Fig. 2 is the obtained steel plate of embodiment 2 typical organizational topography under metallographic microscope；
Fig. 3 is the obtained steel plate of embodiment 3 typical organizational topography under metallographic microscope.
Specific embodiment
Embodiment 1
A kind of deep-sea acid-resistant pipeline steel provided in this embodiment, chemical component and mass percent are as follows: C:0.023%, Si:
0.33%, Mn:1.18%, P:0.009%, S:0.0009%, Nb:0.036%, Ti:0.015%, Ni:0.23%, Cr:0.23%, Mo:
0.18%, Cu:0.002%, V:0.002%, Al:0.036%, Ceq:0.318%, Pcm:0.12%, surplus are Fe and impurity.
The production method of above-mentioned deep-sea acid-resistant pipeline steel is as follows:
S1, austenitizing temperature are 1115 DEG C, effectively refine original structure grain size；
S2, breaking down temperature set 1075 DEG C, and the control of breaking down roll-force is in 50000kN~60000kN, average drafts 28mm, really
It protects in the operation of rolling and sufficient dynamic recrystallization occurs, breaking down stage final reduction rate is greater than 25%；The setting of finish rolling start rolling temperature
839 DEG C, 843 DEG C of finishing temperature, zerolling is conducive to that Static Recrystallization, by the improvement of rolling mill practice, obtained group occurs
More uniform densification is knitted, while needle-shaped iron cellulose content is more；
S3, enter 792 DEG C of coolant-temperature gage setting, cooled down after rolling by ultrafast, steel plate goes out cooling system temperature 461
℃；
Steel plate after S4, rolling is sheared after being cooled down by cold bed, head-stamp is put in storage.
Embodiment 2
A kind of deep-sea acid-resistant pipeline steel provided in this embodiment, chemical component and mass percent are as follows: C:0.036%, Si:
0.38%, Mn:1.08%, P:0.006%, S:0.006%, Nb:0.033%, Ti:0.015%, Ni:0.26%, Cr:0.15%, Mo:
0.16%, Cu:0.002%, V:0.002%, Al:0.039%, Ceq:0.296%, Pcm:0.128%, surplus are Fe and impurity.
The production method of above-mentioned deep-sea acid-resistant pipeline steel is as follows:
S1, austenitizing temperature are 1118 DEG C, effectively refine original structure grain size；
S2, breaking down temperature set 1078 DEG C, and the control of breaking down roll-force is in 50000kN~60000kN, average drafts 28mm, really
It protects in the operation of rolling and sufficient dynamic recrystallization occurs, breaking down stage final reduction rate is greater than 25%；The setting of finish rolling start rolling temperature
831 DEG C, 839 DEG C of finishing temperature, zerolling is conducive to that Static Recrystallization, by the improvement of rolling mill practice, obtained group occurs
More uniform densification is knitted, while needle-shaped iron cellulose content is more；
S3, enter 786 DEG C of coolant-temperature gage setting, cooled down after rolling by ultrafast, steel plate goes out cooling system temperature 469
℃；
Steel plate after S4, rolling is sheared after being cooled down by cold bed, head-stamp is put in storage.
Embodiment 3
A kind of deep-sea acid-resistant pipeline steel provided in this embodiment, chemical component and mass percent are as follows: C:0.031%, Si:
0.35%, Mn:1.11%, P:0.007%, S:0.005%, Nb:0.037%, Ti:0.017%, Ni:0.24%, Cr:0.19%, Mo:
0.17%, Cu:0.002%, V:0.002%, Al:0.030%, Ceq:0.305%, Pcm:0.126%, surplus are Fe and impurity.
The production method of above-mentioned deep-sea acid-resistant pipeline steel is as follows:
S1, austenitizing temperature are 1113 DEG C, effectively refine original structure grain size；
S2, breaking down temperature set 1068 DEG C, and the control of breaking down roll-force is in 50000kN~60000kN, average drafts 28mm, really
It protects in the operation of rolling and sufficient dynamic recrystallization occurs, breaking down stage final reduction rate is greater than 25%；The setting of finish rolling start rolling temperature
826 DEG C, 831 DEG C of finishing temperature, zerolling is conducive to that Static Recrystallization, by the improvement of rolling mill practice, obtained group occurs
More uniform densification is knitted, while needle-shaped iron cellulose content is more；
S3, enter 783 DEG C of coolant-temperature gage setting, cooled down after rolling by ultrafast, steel plate goes out cooling system temperature 482
℃；
Steel plate after S4, rolling is sheared after being cooled down by cold bed, head-stamp is put in storage.
The HIC performance detection for the deep-sea acid-resistant pipeline steel that embodiment 1, embodiment 2, embodiment 3 produce is tested according to NACE
TM0248-A experimental solutions standard carries out, (CTR)≤5%, (CSR)≤2%, (CLR)≤15%；SSC performance presses ASTM G39 standard
Four-point bending test is carried out, 4 bend tests of progress in the solution A of NACE TM0177, test period 720 hours, sample
Loading stress is the 80% of practical yield strength.It is observed under 10 times of enlargement ratios after test, as shown in Figure 1, 2, 3, test specimen sample
Thickness direction flawless.
The antiacid pipeline product tissue in prior art deep-sea produced is mainly based on bainite, while there is also a small amount of
Martensite and the island Ma Ao, therefore these products have that Antacid effectiveness is unstable, especially think gauge product often occurs
The underproof phenomenon of Antacid effectiveness.From reaction mechanism, sour corrosion is main happens is that electrochemical reaction, in the tissue,
HIC performance is unqualified to be occurred mainly at banded structure, and think gauge pipeline steel center portion roll-force is small, and deformation is insufficient, band-like
Tissue improves unobvious.
In the prior art, the patent document of Publication No. CN102277530B discloses a kind of " deep-sea use >=25mm
Thick pipe line steel and its production method ", composition design are had significant difference, are designed using high alloy low Carbon Manganese, are reduced segregation and are mentioned
Center portion quality is risen, milling method and the present invention have significant difference, and the organization type that the type of cooling obtains is completely inconsistent；Separately there are public affairs
The number of opening is the patent document of CN108893678A, is disclosed " a kind of acid-resistant pipeline steel and milling method ", and composition design is high
Cr deisgn product is Hi-grade steel product, and yield strength is 500MPa product, and product of the present invention is designed as X60MS/X65MS, highest
Yield strength 450MPa, the control of rolling cooling procedure temperature spot require also difference, and the type of obtained tissue is also different, this hair
It is bright to need to obtain more ferritic structures, to reach deep-sea military service feature.
Acid-resistant pipeline steel of the invention is rolled by low temperature austenitizing, TMCP, rolls rear rapid cooling technique, rolled piece core structure
It is finer and close, it has effectively prevented sour gas to corrode channel, steel plate hic resistance, SSC performance has been improved, by rolling plate roll-force
Adjustment and rolling temperature point, water cooling temperature spot control, obtained stocking product tissue mainly based on quasi- polygonal body,
There is a certain amount of bainite, crystal grain is thinner, organizes finer and close and stablizes；Meanwhile low Carbon Manganese design is effectively reduced in slab
The adverse effect of heart segregation mitigates the adverse effect of banded structure by the control of rolling temperature and cooling system.Sour corrosion
Mainly happens is that electrochemical reaction, in the tissue, pearlite primarily serve the good conductor effect of electricity, set in the operation of rolling
Effective rolling mill practice temperature spot, has obtained the tissue based on quasi-polygonal ferrite, bainite, it is anti-to improve sour corrosion
It answers, so that having antiacid corrosion resistance while product is with deep-sea service ability.In conclusion deep-sea prepared by the present invention is antiacid
The deep-sea of pipeline product is on active service, and to have excellent performance Antacid effectiveness reliable and stable, meets products of different specifications HIC, SSC performance requirement.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (8)
1. a kind of deep-sea acid-resistant pipeline steel, which is characterized in that its chemical component and mass percent are as follows: C:0.020%~
0.040%, Si:0.30%~0.40%, Mn:1.00%~1.20%, P≤0.010%, S≤0.0010%, Nb:0.030%~
0.040%, Ti:0.010%~0.030%, Ni:0.20%~0.30%, Cr:0.10%~0.30%, Mo:0.10%~0.20%, Cu≤
0.010%, V≤0.010%, Al:0.015%~0.050%, Ceq:0.25%~0.38%, Pcm:0.10%~0.17%, surplus Fe
And impurity.
2. a kind of deep-sea acid-resistant pipeline steel according to claim 1, which is characterized in that its chemical component and mass percent
It is as follows: C:0.023%, Si:0.33%, Mn:1.18%, P:0.009%, S:0.0009%, Nb:0.036%, Ti:0.015%, Ni:
0.23%, Cr:0.23%, Mo:0.18%, Cu:0.002%, V:0.002%, Al:0.036%, Ceq:0.318%, Pcm:0.12%, it is remaining
Amount is Fe and impurity.
3. a kind of deep-sea acid-resistant pipeline steel according to claim 1, which is characterized in that its chemical component and mass percent
It is as follows: C:0.036%, Si:0.38%, Mn:1.08%, P:0.006%, S:0.006%, Nb:0.033%, Ti:0.015%, Ni:
0.26%, Cr:0.15%, Mo:0.16%, Cu:0.002%, V:0.002%, Al:0.039%, Ceq:0.296%, Pcm:0.128%, it is remaining
Amount is Fe and impurity.
4. a kind of deep-sea acid-resistant pipeline steel according to claim 1, which is characterized in that its chemical component and mass percent
It is as follows: C:0.031%, Si:0.35%, Mn:1.11%, P:0.007%, S:0.005%, Nb:0.037%, Ti:0.017%, Ni:
0.24%, Cr:0.19%, Mo:0.17%, Cu:0.002%, V:0.002%, Al:0.030%, Ceq:0.305%, Pcm:0.126%, it is remaining
Amount is Fe and impurity.
5. a kind of deep-sea acid-resistant pipeline steel milling method, it is characterised in that: 1110 DEG C~1120 DEG C of austenitizing temperature；It rolled
Cheng Zhong, breaking down temperature are set as 1060 DEG C~1090 DEG C, and the breaking down stage is averaged roll-force 50000kN~60000kN, under mean pressure
About 28mm is measured, breaking down stage final reduction rate is greater than 25%；Finish rolling start rolling temperature sets 820 DEG C~850 DEG C, finishing temperature 830
DEG C~850 DEG C；Enter coolant-temperature gage and set 780 DEG C~800 DEG C, steel plate goes out 400 DEG C~500 DEG C of cooling system temperature after rolling.
6. a kind of deep-sea acid-resistant pipeline steel milling method according to claim 5, it is characterised in that:
S1, austenitizing temperature are 1115 DEG C, effectively refine original structure grain size；
S2, breaking down temperature set 1075 DEG C, and the control of breaking down roll-force is in 50000kN~60000kN, average drafts 28mm, really
It protects in the operation of rolling and sufficient dynamic recrystallization occurs, breaking down stage final reduction rate is greater than 25%；The setting of finish rolling start rolling temperature
839 DEG C, 843 DEG C of finishing temperature, zerolling is conducive to that Static Recrystallization, by the improvement of rolling mill practice, obtained group occurs
More uniform densification is knitted, while needle-shaped iron cellulose content is more；
S3, enter 792 DEG C of coolant-temperature gage setting, cooled down after rolling by ultrafast, steel plate goes out cooling system temperature 461
℃；
Steel plate after S4, rolling is sheared after being cooled down by cold bed, head-stamp is put in storage.
7. a kind of deep-sea acid-resistant pipeline steel milling method according to claim 5, it is characterised in that:
S1, austenitizing temperature are 1118 DEG C, effectively refine original structure grain size；
S2, breaking down temperature set 1078 DEG C, and the control of breaking down roll-force is in 50000kN~60000kN, average drafts 28mm, really
It protects in the operation of rolling and sufficient dynamic recrystallization occurs, breaking down stage final reduction rate is greater than 25%；The setting of finish rolling start rolling temperature
831 DEG C, 839 DEG C of finishing temperature, zerolling is conducive to that Static Recrystallization, by the improvement of rolling mill practice, obtained group occurs
More uniform densification is knitted, while needle-shaped iron cellulose content is more；
S3, enter 786 DEG C of coolant-temperature gage setting, cooled down after rolling by ultrafast, steel plate goes out cooling system temperature 469
℃；
Steel plate after S4, rolling is sheared after being cooled down by cold bed, head-stamp is put in storage.
8. a kind of deep-sea acid-resistant pipeline steel milling method according to claim 5, it is characterised in that:
S1, austenitizing temperature are 1113 DEG C, effectively refine original structure grain size；
S2, breaking down temperature set 1068 DEG C, and the control of breaking down roll-force is in 50000kN~60000kN, average drafts 28mm, really
It protects in the operation of rolling and sufficient dynamic recrystallization occurs, breaking down stage final reduction rate is greater than 25%；The setting of finish rolling start rolling temperature
826 DEG C, 831 DEG C of finishing temperature, zerolling is conducive to that Static Recrystallization, by the improvement of rolling mill practice, obtained group occurs
More uniform densification is knitted, while needle-shaped iron cellulose content is more；
S3, enter 783 DEG C of coolant-temperature gage setting, cooled down after rolling by ultrafast, steel plate goes out cooling system temperature 482
℃；
Steel plate after S4, rolling is sheared after being cooled down by cold bed, head-stamp is put in storage.
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| CN109811257A (en) * | 2019-01-21 | 2019-05-28 | 南京钢铁股份有限公司 | A kind of deep-sea acid-resistant pipeline steel and smelting process |
| CN111286672A (en) * | 2020-03-25 | 2020-06-16 | 江苏省沙钢钢铁研究院有限公司 | Needle-shaped ferrite type X60-grade HIC-resistant pipeline steel and rolling method thereof |
| CN111519097A (en) * | 2020-05-12 | 2020-08-11 | 首钢集团有限公司 | 460 MPa-level structural steel and preparation method thereof |
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| CN109811257A (en) * | 2019-01-21 | 2019-05-28 | 南京钢铁股份有限公司 | A kind of deep-sea acid-resistant pipeline steel and smelting process |
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| CN111519097A (en) * | 2020-05-12 | 2020-08-11 | 首钢集团有限公司 | 460 MPa-level structural steel and preparation method thereof |
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