CN105648327B - A kind of Pipeline Steel Plate and preparation method of small reduction ratio hic resistance and SSC - Google Patents
A kind of Pipeline Steel Plate and preparation method of small reduction ratio hic resistance and SSC Download PDFInfo
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- CN105648327B CN105648327B CN201610086846.0A CN201610086846A CN105648327B CN 105648327 B CN105648327 B CN 105648327B CN 201610086846 A CN201610086846 A CN 201610086846A CN 105648327 B CN105648327 B CN 105648327B
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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Abstract
The invention discloses the Pipeline Steel Plates and preparation method of a kind of small reduction ratio hic resistance and SSC.The chemical composition and weight percent content of the steel plate include：C：0.03%~0.05%, Si：0.15%~0.30%, Mn：≤ 1.20%, S：≤ 0.0020%, P：≤ 0.010%, Cr：≤ 0.30%, Ni：≤ 0.20%, Nb：0.035%~0.055%, Ti：≤ 0.030%, Alt：0.015%~0.040%, O：≤ 0.0030%, H：≤ 0.00015%, remaining is Fe and trace impurity.The present invention is using Ultra-low carbon, super-low sulfur, low-phosphorous composition design, control effective total reduction >=50% of austenite recrystallization area rolling, three percentage pass reduction >=18% afterwards, total reduction >=70% of austenite Unhydrated cement, the steel plate that this method obtains has excellent hic resistance and anti-SSC performances, alloy addition is few, production cost is low, effective compression ratio≤10, structural homogenity is good, the advantages that small to the restrictive condition of slab thickness, suitable for oil of the manufacture containing acid medium, natural-gas transfer pipeline.
Description
Technical field
The invention belongs to acid corrosion-resistant Pipeline Steel Plate manufacturing field, more particularly to a kind of pipe of small reduction ratio hic resistance and SSC
Line steel plate and preparation method.
Background technology
Currently, pipeline is still, long distance delivery oil, natural gas be most economical, rational means of transportation.In view of pipe
Line laying length is big, across geographic area, difference is big, and the geographical environment where leading to pipeline is complicated, substantial portion of pipeline many places
In moist environment.In addition, containing a large amount of acidic materials, such as H in the oil and gas of conveying2The sour gas such as S, because
This, in conveying sulfide hydrogen (H2S) when acid medium natural gas, to prevent corrosion failure of the sour gas to pipeline, it is desirable that pipe
Line steel has resistance against hydrogen cracking (Hydrogen Induced Crack, HIC) and sulfide-stress cracking (sulfide
Stress cracking, SSC).The Properties of HIC resistance quality of pipeline is to influence pipe-line system reliability and safe operating life
Key factor.
The patent document about hic resistance/SSC Pipeline Steel Plates announced at present, such as：Publication No. CN
101928885A " hydrothion corrosion resistant pipe steel and its production method " provides a kind of high strength sulfur resisting hydrogen-type corrosion pipeline
With the production method of steel, chemical composition (mass percent) is：C：0.05%~0.10%, Si 0~0.35%, Mn：
1.15%~.35%, P：0~0.015%, S：0~0.006%, Nb：0.04%~0.06%, Ti：0.015%-0.03%,
V：0.035%~0.065%, Cu：0.2%~0.3%, Ni：0.2%~0.3%, Al：0.015%~0.02%, surplus is
Fe and inevitable impurity element.The invention carbon content is higher, and design carbon content is 0.05%~0.10%, the carbon in implementation
Content is 0.06%, 0.08%, 0.09%.It is a large amount of existing studies have shown that higher carbon content is particularly disadvantageous for pipe line steel hic resistance
Performance.In addition the sulfur content in steel is higher, and design sulfur content is 0~0.006%, and the sulfur content in embodiment is respectively
0.003%, 0.0025%, 0.003%.Higher sulfur content can lead to the uncontrollable of sulfide content and rank in steel, cause
Hydrogen induced cracking (HIC) preferentially generates at sulfide, deteriorates Properties of HIC resistance.In addition, " the pipe line steel of American Petroleum Institute's publication
" the industrial gas oil pipeline delivery system steel pipe GB/T that pipe specification API 5L-2012 ", State General Administration for Quality Supervision issue
Sulfur content in the standards such as 9711-2011 " in clear stipulaties steel requires to be less than 0.002%.Although the intensity that embodiment is related to compared with
Height, but toughness is relatively low.For hydrothion corrosion resistant pipe steel, mostly with the dual anti-requirement of hic resistance and anti-SSC performances.
Publication No. CN103526129B " a kind of think gauge acid-resisting corrosion X65 Pipeline Steel Plates and its manufacturing method ",
Chemical composition mass percent is：C 0.04~0.06%, Si 0~0.04%, Mn 1.35~1.70%, P≤0.010%, S
≤ 0.0015%, Nb 0.035~0.050%, Ti 0.010~0.020%, Mo 0.10~0.20%, Cu 0.15~
0.35%, Cr 0.15~0.35%, Ni 0.15~0.30%, Al 0.020~0.035%, N≤0.0045%, H≤
0.00015%, O≤0.0025%, wherein [H]+[O]+[N]+[P]+[S]≤170ppm, surplus Fe.It is easy to be inclined in the invention
The content for analysing element M n is higher, it is easy to cause the Mn of thick steel plates core to be segregated, to deteriorate Properties of HIC resistance.In addition, beautiful
" the Laboratory Testing of Metals for Resistance to Sulfide of state corrosion engineering Shi Xiehui publications
Stress Cracking and Stress Corrosion Cracking in H2S Environments, NACE TM
SSC test methods have the test forms such as bending, stretching involved in 0177-2005 " standards, the corresponding experiment knot of each test method
Fruit does not have correspondence.Steel plate involved in the invention is prepared by TMCP techniques, can not be kept away in steel plate thickness direction
Exempt from there are segregation, the unequal objective factors of microscopic structure, this will cause the SSC of different location on steel plate thickness direction to test
As a result there is apparent difference.SSC inspections in embodiment lack SSC test forms and sample prepares necessary description.
Invention content
It is an object of the present invention to provide a kind of hic resistance and SSC Pipeline Steel Plates and using the preparation side of continuous casting billet small reduction ratio
Method.There is steel plate prepared by the production alloy to add less, production cost is low, the performance of hic resistance, especially steel plate thickness direction t/
4, the anti-SSC function admirables at t/2,3t/4.In addition, another distinguishing feature of this method is control austenite recrystallization area and not
Effective total reduction in the recrystallization zone operation of rolling, the smaller compression ratio of use produce hic resistance/SSC Pipeline Steel Plates, relax casting
The restrictive condition of base thickness, economy are further embodied.
To achieve the above object, the Pipeline Steel Plate of small reduction ratio hic resistance and SSC of the invention, chemical composition and weight
Degree includes：C：0.03%~0.05%, Si：0.15%~0.30%, Mn：≤ 1.20%, S：≤ 0.0020%, P：
≤ 0.010%, Cr：≤ 0.30%, Ni：≤ 0.20%, Nb：0.035%~0.055%, Ti：≤ 0.030%, Alt：
0.015%~0.040%, O：≤ 0.0030%, H：≤ 0.00015%, remaining is Fe and trace impurity.
Pipeline Steel Plate according to the present invention, wherein preferably, the hic resistance and the specification of SSC Pipeline Steel Plates are：Thickness 18
~25mm, 2400~2800mm of width.
Pipeline Steel Plate according to the present invention, wherein effective compression ratio≤10 of the Pipeline Steel Plate.
It is a further object to provide the preparation method of above-mentioned small reduction ratio hic resistance/SSC Pipeline Steel Plates, the party
Method includes：Steel plate control cooling after heating steel billet, formation rolling, formation rolling and slow cooling, wherein specifically including following steps：
(a) heating steel billet technique：Billet heating temperature is controlled at 1180~1240 DEG C；
(b) rolling mill practice：Steel billet after milling step (a) heating；Wherein, austenite recrystallization area start rolling temperature is 1150
~1200 DEG C, austenite recrystallization area finishing temperature >=1000 DEG C；Austenite Unhydrated cement start rolling temperature is 920~960 DEG C,
Austenite Unhydrated cement open rolling thickness is 3.0~4.5 times of finished product thickness；
(c) cooling technique：Steel plate machine after step (b) is rolled cools down；Wherein, it is >=780 that steel plate, which opens cold temperature,
DEG C, final cooling temperature is 520~600 DEG C, and cooling velocity is 14~24 DEG C/s.
Preferably for the steel plate of 18~25mm thickness, given birth to using the continuous casting billet of 200mm (thickness) × 2200mm (width)
Production steel plate is hic resistance/SSC Pipeline Steel Plates of (18~25) mm (thickness) × (2400~2800) mm (width), effectively rolling pressure
Contracting is than being≤10.0, preferably≤8.0.
Preferably, when steel plate thickness is 18~21mm, austenite recrystallization area start rolling temperature is 940~960 DEG C, Ovshinsky
Body Unhydrated cement open rolling thickness is 3.6~4.5 times of finished steel plate thickness；Temperature >=780 DEG C are begun to cool, cooling temperature is terminated
Degree is 560-600 DEG C, and cooling velocity is 18~24 DEG C/s.
Preferably, when steel plate thickness is 21~25mm of ＞ (be more than 21mm and be less than or equal to 25mm), austenite recrystallization
Area's start rolling temperature is 940 DEG C of 920~＜ (is more than or equal to 920 DEG C and is less than 940 DEG C), and austenite Unhydrated cement open rolling thickness is
3.6 times of 3.0~＜ (be more than or equal to 3.0 times and be less than 3.6 times) of finished steel plate thickness；Temperature >=780 DEG C are begun to cool, are terminated
Cooling temperature is 560 DEG C of 520~＜ (is more than or equal to 520 DEG C and is less than 560 DEG C), and cooling velocity is that 14~＜, 18 DEG C/s (are more than
Equal to 14 DEG C/s and it is less than 18 DEG C/s).
Preferably, effective total reduction >=50% in austenite recrystallization area, rear three percentage pass reduction >=18%.It is difficult to understand
Total reduction >=70% of family name's body Unhydrated cement.
Preferably, in the austenite recrystallization area operation of rolling, steel billet broadening is rolling to target width first, then again will
Steel billet axial rolling is to austenite Unhydrated cement target open rolling thickness.
The Design of Chemical Composition principle of above-mentioned steel plate is as follows：
Carbon (C)：C works are one of raising most effective elements of intensity in steel, but for the material for having Properties of HIC resistance,
Its too high levels will seriously reduce Properties of HIC resistance.Numerous studies show that for pipe line steel, C content is more than 0.05%
When, the hic resistance of steel plate and anti-SSC deterioration degrees obviously increase.American Petroleum Institute's publication《Pipeline steel tube specification API 5L-
2012》, State General Administration for Quality Supervision publication《Industrial gas oil pipeline delivery system steel pipe GB/T 9711-2011》Deng mark
Carbon content≤0.10% in clear stipulaties steel in standard.Therefore, to ensure hic resistance/SSC performances, C content should control in steel
0.03%~0.05%.
Manganese (Mn)：Mn plays the role of solution strengthening in steel, and can improve the through hardening performance of steel, makes up C content
Intensity caused by reducing declines.In addition, Mn can also expand γ phase regions, help to obtain tiny phase-change product, Ke Yiti
The toughness of Gao Gang reduces ductile-brittle transition temperature.But the center portion of Mn too high levels, continuous casting billet and steel plate easy tos produce center segregation,
This center segregation is particularly disadvantageous for hic resistance/SSC performances.Therefore, to take into account the acquisition of obdurability and hic resistance/SSC performances, this
The Mn control of element for the steel plate being related to is invented 1.0%~1.2%.
Nickel (Ni), chromium (Cr)：Ni elements, the addition of Cr elements compoundings can greatly enhance the quenching degree of steel plate.Keep steel plate final
During on-line cooling after formation rolling, the synchronism of the cooling of steel plate thickness direction is more preferable, steel plate thickness direction it is micro-
Tissue is more uniform, it is ensured that hic resistance/SSC performances.In addition, Ni elements, Cr elements addition can solution strengthening improve steel it is strong
Degree, to make up the loss of strength caused by the reduction of carbon content in steel.Ni elements are added in steel, Cr elements can also improve steel
Corrosion resistance.
Niobium (Nb), titanium (Ti)：In view of being greatly lowered for the alloying element contents such as C, Mn in steel, the loss of strength of steel compared with
Greatly.For postponement austenite recrystallization, Austenite Grain Growth is prevented, refined crystalline strengthening is given full play to and acts on, compound addition Nb in steel
With Ti microalloy elements.Numerous studies show that Nb and Ti microalloyings are used in combination with TMCP technologies, can significantly improve pipeline
The microscopic structure of steel and the important means of mechanical property.The Nb control of element of steel plate of the present invention 0.020%~
0.050%, Ti control of element are ≤0.030%.
Phosphorus (P)：Phosphorus is the easy segregation element in steel, will lead to the reduction of material Properties of HIC resistance.Therefore, it should drop as possible
Phosphorus content in low steel.The P element of steel plate of the present invention is controlled≤0.010%.
Sulphur (S)：S forms A type impurities, such as FeS in steel, and this field trash hardness is relatively low, in subsequent formation rolling
It is easy to extend into fine strip shape or chain along rolling direction in the process.H in medium+By absorption, spreads, is gathered in A classes
At field trash, 2H occurs++2e→2H(atomic hydrogen)→H2(gas), lead to the huge hydrogen of the generation at field trash point
Pressure, eventually leads to HIC and SSC.Therefore, S contents in steel should be reduced as possible, reduce the quantity and rank of A type impurities.This hair
The S control of element of the bright steel plate being related to is ≤0.0020%.
Aluminium (Alt)：In order to realize quick, efficient deoxidation and the deep desulfurization during LF refining, strong deoxidier is generally used
Al elements, therefore should ensure that certain Alt contents in steel.But the excessive aluminium content one of steel grade is to be easy to cause nozzle clogging, two
It is that the content containing aluminum inclusion in steel will increase, has an adverse effect to hic resistance and anti-SSC performances.In the steel plate of the present invention
In Alt contents control 0.015%~0.040%.
Oxygen (O)：O in steel forms on-deformable oxide-based field trash and with bulky grain DS classes with other alloying elements
Field trash.This type impurity is often the sensitizing range that HIC is generated.Therefore, the O content in steel should be reduced as far as possible.
Hydrogen (H)：H in steel is harmful element, and too high levels are unfavorable by confrontation HIC/SSC performances, and it is tough to reduce low-temperature impact
Property.
The design principle of the preparation method of above-mentioned steel plate is as follows：
Hic resistance/SSC performances have stronger sensibility, tissue to the structural homogenity in pipe line steel steel plate thickness direction
It is uneven often increase HIC/SSC occurrence probability.To ensure that rolling deformation is effective in the austenite recrystallization area operation of rolling
Infiltration steel billet core breaks essence coarse grain, and austenite recrystallization area, which rolls, uses heavy reduction rate rolling, and total reduction ratio >=
50%, rear three percentage pass reduction >=18%, reduction ratio >=70% in the rolling of austenite Unhydrated cement.By rolling skill above
The implementation of art makes up the deficiency of small reduction ratio, to improve the structural homogenity of steel plate thickness direction.
Description of the drawings
Fig. 1 is the metallographic structure at the steel plate near surface that the embodiment of the present invention obtains.
Fig. 2 is the metallographic structure at steel plate t/4 thickness that the embodiment of the present invention obtains.
Fig. 3 is the metallographic structure at steel plate t/2 thickness that the embodiment of the present invention obtains.
Fig. 4 is the metallographic structure at steel plate 3t/4 thickness that the embodiment of the present invention obtains.
Fig. 5 is the metallographic structure at another near surface of steel plate that the embodiment of the present invention obtains.
Fig. 6 is hic resistance test sample sample blanks of embodiment of the present invention sample position schematic diagram.
Fig. 7 is hic resistance test sample machining sketch chart of the embodiment of the present invention.
Fig. 8 is the anti-SSC test samples sample blanks sample position schematic diagram of the embodiment of the present invention.
Fig. 9 is the anti-SSC test samples machining sketch chart of the embodiment of the present invention.
Specific implementation mode
With specific implementation mode, the present invention is described in further detail below.
Embodiment 1
The chemical composition and weight percent content of the steel plate produced according to the method for the present invention be：C：0.04%, Si：
0.22%, Mn：1.05%, S：0.008%, P：0.009%, Nb：0.045%, Ti：0.015%, Ni：0.15%, Cr：
0.25%, Alt：0.033%, O：0.0025%, H：0..00015%, remaining is Fe and trace impurity.
The thickness of the small reduction ratio hic resistance/SSC Pipeline Steel Plates of the present embodiment be 18mm, width 2450mm, 2610mm and
2800mm, manufacturing method are as follows：
(1) it smelts：Molten iron is by KR pretreatments, 120 tons of top and bottom combined blown converter smeltings, 120 tons of LF ladle furnace refinings, 120
The continuous casting billet that cross dimensions is 200mm × 2200mmm is made in the ton technical process such as RH vacuum deaeration refinings and slab caster, adopts
It is heated with walking beam heating furnace.
(2) heating steel billet technique：Billet heating temperature is controlled at 1194 DEG C.
(3) rolling mill practice：Austenite recrystallization area start rolling temperature is 1165 DEG C, austenite recrystallization area finishing temperature 1125
℃。
The non-crystal region start rolling temperature of austenite of 2450mm width steel plates is 951 DEG C, and it is finished steel that rolling thickness is opened in finish rolling
4.4 times of plate thickness, crystalline region axial rolling adds up reduction ratio to austenite again is 55.9%, and rear three percentage pass reduction is respectively,
19.9%, 2,3.2%, 35.8%, axial rolling accumulative reduction ratio in crystalline region is 77.3% to austenite again.Accumulating effective compression ratio is
9.98。
The non-crystal region start rolling temperature of austenite of 2610mm width steel plates is 955 DEG C, and it is finished steel that rolling thickness is opened in finish rolling
4.2 times of plate thickness.Axial rolling accumulative reduction ratio in crystalline region is 55.2% to austenite again, and rear three percentage pass reduction is respectively
21.6%, 26.2%, 33.9%, axial rolling accumulative reduction ratio in crystalline region is 76.2% to austenite again.Accumulating effective compression ratio is
9.37。
The non-crystal region start rolling temperature of austenite of 2800mm width steel plates is 960 DEG C, and it is finished steel that rolling thickness is opened in finish rolling
3.8 times of plate thickness.Axial rolling accumulative reduction ratio in crystalline region is 56.5% to austenite again, and rear three percentage pass reduction is respectively
20.8%, 25.3%, 30.1%, axial rolling accumulative reduction ratio in crystalline region is 73.7% to austenite again.Accumulating effective compression ratio is
8.73。
(4) cooling technique is as follows：
The cold temperature of opening of 2400mm width steel plates is 836 DEG C, and final cooling temperature is 587 DEG C, and cooling velocity is 18 DEG C/s；
The cold temperature of opening of 2610mm width steel plates is 821 DEG C, and final cooling temperature is 578 DEG C, and cooling velocity is 19 DEG C/s；
The cold temperature of opening of 2800mm width steel plates is 830 DEG C, and final cooling temperature is 571 DEG C, and cooling velocity is 21 DEG C/s.
Embodiment 2
The chemical composition and weight percent content of the steel plate produced according to the method for the present invention be：C：0.035%,
Si：0.22%, Mn：1.10%, S：0.006%, P：0.009%, Nb：0.051%, Ti：0.015%, Ni：0.16%, Cr：
0.23%, Alt：0.036%, O：0.0025%, H：0..00015%, remaining is Fe and trace impurity.
The preparation method technical process and Cross Section of CC Billet size of the present embodiment with embodiment 1, difference lies in：
(1) thickness of final rolled plate is 20mm, width 2400mm, 2550mm and 2730mm.
(2) heating steel billet technique：Billet heating temperature is controlled at 1194 DEG C.
(3) rolling mill practice：Austenite recrystallization area start rolling temperature is 1165 DEG C, austenite recrystallization area finishing temperature 1125
℃。
The non-crystal region start rolling temperature of austenite of 2400mm width steel plates is 942 DEG C, and it is finished steel that rolling thickness is opened in finish rolling
4.2 times of plate thickness, axial rolling accumulative reduction ratio in crystalline region is 54.2% to austenite again, and rear three percentage pass reduction is respectively
21.2%, 24.9%, 36.2%, axial rolling accumulative reduction ratio in crystalline region is 76.2% to austenite again.Accumulating effective compression ratio is
9.16。
The non-crystal region start rolling temperature of austenite of 2550mm width steel plates is 948 DEG C, and it is finished steel that rolling thickness is opened in finish rolling
3.8 times of plate thickness.Axial rolling accumulative reduction ratio in crystalline region is 56.0% to austenite again, and rear three percentage pass reduction is respectively
20.8%, 25.2%, 35.0%, axial rolling accumulative reduction ratio in crystalline region is 73.7% to austenite again.Accumulating effective compression ratio is
8.63。
The non-crystal region start rolling temperature of austenite of 2730mm width steel plates is 955 DEG C, and it is finished steel that rolling thickness is opened in finish rolling
3.6 times of plate thickness.Axial rolling accumulative reduction ratio in crystalline region is 55.3% to austenite again, and rear three percentage pass reduction is respectively
19.7%, 23.9%, 22.7%, axial rolling accumulative reduction ratio in crystalline region is 72.2% to austenite again.Accumulating effective compression ratio is
8.06。
(4) cooling technique is as follows：
The cold temperature of opening of 2400mm width steel plates is 830 DEG C, and final cooling temperature is 597 DEG C, and cooling velocity is 19 DEG C/s；
The cold temperature of opening of 2550mm width steel plates is 837 DEG C, and final cooling temperature is 577 DEG C, and cooling velocity is 20 DEG C/s；
The cold temperature of opening of 2730mm width steel plates is 833 DEG C, and final cooling temperature is 561 DEG C, and cooling velocity is 23 DEG C/s.
Embodiment 3
The chemical composition and weight percent content of the steel plate produced according to the method for the present invention be：C：0.033%,
Si：0.22%, Mn：1.15%, S：0.009%, P：0.010%, Nb：0.052%, Ti：0.015%, Ni：0.15%, Cr：
0.27%, Alt：0.029%, O：0.0024%, H：0.00015%, remaining is Fe and trace impurity.
The preparation method technical process and Cross Section of CC Billet size of the present embodiment with embodiment 1, difference lies in：
(1) thickness of final rolled plate is 25mm, width 2400mm, 2500mm and 2600mm.
(2) heating steel billet technique：Billet heating temperature is controlled at 1194 DEG C.
(3) rolling mill practice：Austenite recrystallization area start rolling temperature is 1165 DEG C, austenite recrystallization area finishing temperature 1125
℃。
The non-crystal region start rolling temperature of austenite of 2400mm width steel plates is 924 DEG C, and it is finished steel that rolling thickness is opened in finish rolling
3.5 times of plate thickness, axial rolling accumulative reduction ratio in crystalline region is 52.3% to austenite again, and rear three percentage pass reduction is respectively
19.2%, 22.1%, 24.4%.Axial rolling accumulative reduction ratio in crystalline region is 71.4% to austenite again.Accumulating effective compression ratio is
7.33。
The non-crystal region start rolling temperature of austenite of 2500mm width steel plates is 933 DEG C, and it is finished steel that rolling thickness is opened in finish rolling
3.4 times of plate thickness.Axial rolling accumulative reduction ratio in crystalline region is 51.7% to austenite again, and rear three percentage pass reduction is respectively
19.7%, 20.7%, 22.5%, axial rolling accumulative reduction ratio in crystalline region is 70.6% to austenite again.Accumulating effective compression ratio is
7.04。
The non-crystal region start rolling temperature of austenite of 2600mm width steel plates is 939 DEG C, and it is finished steel that rolling thickness is opened in finish rolling
3.35 times of plate thickness.Axial rolling accumulative reduction ratio in crystalline region is 50.5% to austenite again, and rear three percentage pass reduction is respectively
18.9%, 21.3%, 20.9%, axial rolling accumulative reduction ratio in crystalline region is 70.1% to austenite again.Accumulating effective compression ratio is
6.77。
(4) cooling technique is as follows：
The cold temperature of opening of 2400mm width steel plates is 815 DEG C, and final cooling temperature is 541 DEG C, and cooling velocity is 16 DEG C/s；
The cold temperature of opening of 2500mm width steel plates is 836 DEG C, and final cooling temperature is 550 DEG C, and cooling velocity is 15 DEG C/s；
The cold temperature of opening of 2600mm width steel plates is 811 DEG C, and final cooling temperature is 529 DEG C, and cooling velocity is 17 DEG C/s.
Mechanical property survey is carried out to the small reduction ratio hic resistance/SSC Pipeline Steel Plates prepared in above example 1 to embodiment 3
Examination, test result are as shown in table 1.
The mechanical property of 1 small reduction ratio hic resistance/SSC Pipeline Steel Plates according to the present invention of table
Hic resistance experiment is carried out to the small reduction ratio hic resistance/SSC Pipeline Steel Plates prepared in above example 1 to embodiment 3.
Hic resistance test stone is NACE TM 0284-2003, and testing liquid is solution A, i.e.,：5%NaCl+0.5%CH3COOH+ is saturated
(wherein the reagent purity of sodium chloride and glacial acetic acid is that analysis is pure to hydrogen sulfide solution, and solvent is deionized water, and nitrogen gas purity is
99.99%, vulcanization hydrogen purity is that 99.99%), organic glass reactor volume is 300L, and temperature control method heats for circulator bath.
The etching time of HIC samples is 96 hours, and HIC specimen sizes are shown in Fig. 6 and Fig. 7.Properties of HIC resistance test result is as shown in table 2.
The Properties of HIC resistance of 2 small reduction ratio hic resistance/SSC Pipeline Steel Plates according to the present invention of table
Anti- SSC experiments are carried out to the small reduction ratio hic resistance/SSC Pipeline Steel Plates prepared in above example 1 to embodiment 3.
Anti- SSC test stones are NACE TM 0177-2003, and testing liquid is solution A, i.e.,：5%NaCl+0.5%CH3COOH+ is saturated
(wherein the reagent purity of sodium chloride and glacial acetic acid is that analysis is pure to hydrogen sulfide solution, and solvent is deionized water, and nitrogen gas purity is
99.99%, vulcanization hydrogen purity is that 99.99%), organic glass reactor volume is 300L, and temperature control method heats for circulator bath.
The loading stress of SSC samples is 72% practical yield strength, and the etching time of sample is 720 hours, and test form is 4 points curved
Song experiment, SSC specimen sizes are shown in Fig. 8 and Fig. 9.Anti- SSC the performance test results are as shown in table 3.
The anti-SSC performances of 3 small reduction ratio hic resistance/SSC Pipeline Steel Plates according to the present invention of table
By above example 1 to embodiment 3 and table 1 to table 3 as can be seen that the steel plate manufactured according to embodiments of the present invention
As can be seen that at least there is following advantages in the present invention：
(1) by low C, low S and low P composition designs, the alloying elements such as Ni, Cr, Nb, Ti are added on a small quantity, do not add Cu, Mo
Equal noble metals, low cost production hic resistance/SSC Pipeline Steel Plates.
(2) under the conditions of small reduction ratio, pass through the reality of the technologies such as rational rolling temperature, the control of compacting rate, cooling system
It applies, it is (wide to prepare (18-25) mm thickness × (2400-2800) mm using the continuous casting billet of 200mm (thickness) × 2200mm (width)
Degree) hic resistance/SSC Pipeline Steel Plates, accumulate compression ratio≤10, the restrictive condition of continuous casting billet reduced.
(3) by controlling the percentage pass reduction of austenite recrystallization area rolling and adding up effective reduction ratio, austenite is not again
The total reduction of crystal region rolling, prepared hic resistance/SSC Pipeline Steel Plate thickness direction even tissues, crystal grain is tiny, to obtain
The microscopic structure that good hic resistance/SSC performances provide is obtained to ensure.
(4) hic resistance/SSC Pipeline Steel Plates of (18-25) mm thickness × (2400-2800) mm (width) have good anti-
HIC performances.
(5) it is the SSC performances for more reasonably evaluating steel plate, carries out the SSC experiments at t/4, t/2,3t/4.(18-25)mm
Four-point bending SSC performances at t/4, t/2,3t/4 of hic resistance/SSC Pipeline Steel Plates of thickness × (2400-2800) mm (width)
Well.
Those of ordinary skill in the art it should be appreciated that more than embodiment be intended merely to illustrate the present invention,
And be not used as limitation of the invention, as long as in the spirit of the present invention, the change to embodiment described above
Change, deformation will all be fallen within the scope of claims of the present invention.
Claims (4)
1. the preparation method of the Pipeline Steel Plate of a kind of small reduction ratio hic resistance and SSC, includes the following steps：
(a) heating steel billet technique：Billet heating temperature is controlled at 1180~1240 DEG C；
(b) rolling mill practice：Steel billet after milling step (a) heating；Wherein, austenite recrystallization area start rolling temperature be 1150~
1200 DEG C, austenite recrystallization area finishing temperature >=1000 DEG C；Steel billet broadening is rolling to target width first, then again by steel
Base axial rolling is to austenite Unhydrated cement target open rolling thickness；Austenite Unhydrated cement start rolling temperature is 920~960 DEG C, difficult to understand
Family name's body Unhydrated cement open rolling thickness is 3.0~4.5 times of finished product thickness；Effective total reduction in the austenite recrystallization area >=
50%, rear three percentage pass reduction >=18%；Total reduction >=70% of austenite Unhydrated cement；
(c) cooling technique：Steel plate after step (b) is rolled cools down；Wherein, it is >=780 DEG C that steel plate, which opens cold temperature, cold eventually
Temperature is 520~600 DEG C, and cooling velocity is 14~24 DEG C/s；
Wherein, the chemical composition of the Pipeline Steel Plate and weight percent content include：C：0.03%~0.05%, Si：
0.15%~0.30%, Mn：≤ 1.20%, S：≤ 0.0020%, P：≤ 0.010%, Cr：≤ 0.30%, Ni：≤ 0.20%,
Nb：0.035%~0.055%, Ti：≤ 0.030%, Alt：0.015%~0.040%, O：≤ 0.0030%, H：≤
0.00015%, remaining is Fe and trace impurity；The hic resistance and the specification of SSC Pipeline Steel Plates are：18~25mm of thickness, width
2400~2800mm；Effective compression ratio≤10 of the Pipeline Steel Plate.
2. preparation method as described in claim 1, which is characterized in that step (b) rolling finished steel plate thickness be 18~
21mm, austenite Unhydrated cement start rolling temperature are 940~960 DEG C, and austenite Unhydrated cement open rolling thickness is finished steel plate
3.6~4.5 times of thickness；Temperature >=780 DEG C are begun to cool, it is 560-600 DEG C to terminate cooling temperature, and cooling velocity is 18~24
℃/s。
3. preparation method as described in claim 1, which is characterized in that step (b) rolling finished steel plate thickness be more than
21mm and be less than or equal to 25mm, austenite Unhydrated cement start rolling temperature be 940 DEG C of 920~＜, austenite Unhydrated cement is opened
Roll 3.6 times of 3.0~＜ that thickness is finished steel plate thickness；Temperature >=780 DEG C are begun to cool, termination cooling temperature is 520~＜
560 DEG C, cooling velocity is 14~＜, 18 DEG C/s.
4. the preparation method as described in any in claim 1-3, which is characterized in that thickness 200mm is used, width 2200mm's
Continuous casting billet production specification is 18~25mm of thickness, the finished steel plate of 2400~2800mm of width.
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| CN107604259A (en) * | 2017-08-31 | 2018-01-19 | 包头钢铁（集团）有限责任公司 | A kind of X70 line steel hot rollings coiled sheet and its production method |
| WO2019058420A1 (en) * | 2017-09-19 | 2019-03-28 | 新日鐵住金株式会社 | Steel pipe and steel plate |
| CN108411194A (en) * | 2018-03-21 | 2018-08-17 | 包头钢铁（集团）有限责任公司 | A kind of acid-resisting corrosion X60MS pipe line steels and preparation method thereof |
| CN108893683A (en) * | 2018-08-01 | 2018-11-27 | 石钢京诚装备技术有限公司 | A kind of sulfur resistive pipe line steel and its production method |
| CN111748741B (en) * | 2020-06-30 | 2022-01-25 | 武汉钢铁有限公司 | Thick pipeline steel and low compression ratio production process thereof |
| CN114774770B (en) * | 2022-02-28 | 2023-04-14 | 鞍钢股份有限公司 | Low-cost anti-HIC (hydrogen induced cracking) L290 hot rolled steel plate for oil and gas pipelines and manufacturing method thereof |
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