CN103602913B - For the X80 steel hot-rolled sheet coil and preparation method thereof of natural gas line - Google Patents
For the X80 steel hot-rolled sheet coil and preparation method thereof of natural gas line Download PDFInfo
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Abstract
The invention discloses a kind of X80 steel hot-rolled sheet coil for natural gas line and preparation method thereof, the chemical component weight per-cent of described X80 steel hot-rolled sheet coil is: C:0.035 ~ 0.070%, Si:0.10 ~ 0.30%, Mn:1.50 ~ 1.95%, P≤0.012%, S≤0.003%, Cu≤0.30%, Cr:0.10 ~ 0.40%, Ni≤0.20%, Mo:0.10 ~ 0.35%, Nb:0.06 ~ 0.10%, V≤0.06; Ti≤0.02%, N≤0.005%, B≤0.0005%, all the other are Fe and inevitable tramp element.The present invention relates to the X80 hot-rolled coil yield strength R of satisfied 0.8 design ratio condition
t0.5be 590 ~ 650MPa, tensile strength R
m>=680MPa, yield tensile ratio R
t0.5/ R
m≤ 0.91, unit elongation A
50mm>=35%;-20 DEG C of ballistic work KV
2monodrome>=280J, ballistic work KV
2monodrome>=310J, ductile-brittle transition temperature FATT50≤-60 DEG C;-15 DEG C of DWTT section shearing rate SA>=95%; Hardness value HV10≤255.
Description
Technical field
The present invention relates to natural gas line hot-rolled sheet coil field, refer to the X80 steel hot-rolled sheet coil and preparation method thereof of a kind of high-intensity high-tenacity for natural gas line particularly, the X80 steel band that this technology of employing is produced have obdurability coupling excellent, along the feature of steel band length direction stable performance.
Background technology
Along with the develop rapidly of China's economy, national economy grows with each passing day to the demand of natural gas energy resource and interdependency.The Natural Gas Consumption Using of 2000 ~ 2009 years China increases about 16% every year, and this rate of growth is still in acceleration.Expect the year two thousand twenty, the natural gas demand of China will reach 3600 billion cubic meters.
China's area is vast, and the natural gas source of about more than 60% is concentrated and contained in western region inland region, and main consumption market concentrates on east thousands of miles away and developed area, middle part.In the face of natural gas source distribution and the unbalanced characteristic in region of the market requirement, the trans-regional long distance delivery problems demand of Sweet natural gas solves.Natural gas line conveying becomes the primary selection effectively solving this energy dilemmas.
The important trend of current piping design farthest reduces pipeline operation cost ensureing natural gas transport efficiency while.The important measures realizing above-mentioned target comprise raising piping design coefficient, increase pipe line steel rank, expand transport pipe bore.So-called piping design coefficient is the ratio of hoop stress that pipe interior high-pressure natural gas produces on its tube wall and pipe line steel name SMYS.Compared to low piping design coefficient pipeline and with steel, under the prerequisite that grade of steel, caliber and distribution pressure are constant, high piping design coefficient is bringing that pipeline wall thickness is thinning, while cost reduces, and the homogeneity etc. of its intensity to pipe line steel, toughness and Properties and Microstructure all proposes higher requirement.
The highest design ratio that China's current natural gas pipeline adopts is 0.72.Adopt X80 pipe line steel on a large scale from the second west to east gas pipeline project since, main force's grade of steel that Present Domestic gas distributing system main line adopts on a large scale is X80 steel.Through scale production for many years and improvement, China X80 pipe line steel is produced and pipe-line construction ability is still in status leading in the world.Compared to the scheme increasing pipe line steel rank and expansion transport pipe bore, by means of Present Domestic iron and steel and the excellent capacity of equipment of pipe enterprise and manufacture level, by being optimized upgrading to the X80 Pipeline Steel Properties of existing level, finally realize X80 piping design coefficient is promoted to 0.8 scheme most feasibility by 0.72.Therefore, invention is a kind of
1219 × 16.5mm specification 0.8 design ratio X80 steel for pipe is necessary very much.
Summary of the invention
Technical problem to be solved by this invention is just to provide the X80 steel hot-rolled sheet coil and preparation method thereof of a kind of high-intensity high-tenacity for natural gas line, the X80 steel band that this technology of employing is produced have obdurability coupling excellent, along the feature of steel band length direction stable performance.
For solving the problems of the technologies described above, a kind of X80 steel hot-rolled sheet coil for natural gas line provided by the invention, the chemical component weight per-cent of described hot-rolled sheet coil is: C:0.035 ~ 0.070%, Si:0.10 ~ 0.30%, Mn:1.50 ~ 1.95%, P≤0.012%, S≤0.003%, Cu≤0.30%, Cr:0.10 ~ 0.40%, Ni≤0.20%, Mo:0.10 ~ 0.35%, Nb:0.06 ~ 0.10%, V≤0.06; Ti≤0.02%, N≤0.005% and B≤0.0005%, all the other are Fe and inevitable tramp element,
This hot-rolled sheet coil also meets CE simultaneously
pcm≤ 0.22%, wherein:
CE
Pcm(%)=C+Si/30+(Cr+Mn+Cu)/20+Mo/15+V/10+Ni/60+5B。
Further, the yield strength of described hot-rolled sheet coil head, middle part and afterbody and tensile strength properties undulating quantity≤40MPa.
Again further, the yield strength R of described hot-rolled sheet coil
t0.5=590 ~ 650MPa, tensile strength R
m>=680MPa, yield tensile ratio R
t0.5/ R
m≤ 0.91, unit elongation A
50mm>=35%;-20 DEG C of ballistic work KV
2monodrome>=280J, ballistic work KV
2monodrome>=310J, ductile-brittle transition temperature FATT50≤-60 DEG C;-15 DEG C of DWTT section shearing rate SA>=95%; Hardness value HV10≤255.
Present invention also offers a kind of X80 steel hot-rolled sheet coil preparation method for natural gas line.The method is by heating of plate blank, roughing, finish rolling and batch and prepare hot-rolled sheet coil.
In above-mentioned preparation process, operating parameters specifically controls as follows:
1) the heating of plate blank stage, slab charging temperature≤650 DEG C, slab reheating temperature is 1160 ~ 1250 DEG C, enter stove heating width of plate slab≤1750mm and long-width ratio is 4.50 ~ 6.25;
2) rough rolling step, roughing finishing temperature is 1010 ~ 1100 DEG C, and rough rolling process adds up draft >=70%;
3) the finish rolling stage, finish rolling finishing temperature is 780 ~ 860 DEG C, and finishing stands adds up draft >=70%;
4 coil ing one, coiling temperature is 350 ~ 500 DEG C.
Principle of the present invention:
The present invention is that the performance of guarantee 0.8 design ratio X80 coiled sheet reaches goal of the invention, and in chemical composition design process, emphasis considers following factor: the strength property of X80 steel, low-temperature flexibility and weldability.According to the factor of this three aspect in detail the effect of each element and the reason of limited amount in the present invention are described in detail below:
Carbon C:C is basic, the most most economical strengthening element, is effectively improved the intensity of steel by solution strengthening and precipitation strength.Not obvious to the effect of intensity when C content is too low, then can reduce the plasticity of steel, toughness and weldability when content is too high.In the present invention, the content of C controls to be 0.035 ~ 0.070%(weight percentage, and following element is identical).
Silicon Si:Si mainly improves the intensity of steel with solution strengthening form, be also the deoxidant element in steel, but when content is too low, strengthening effect is not obvious simultaneously, unfavorable to the toughness of steel again during too high levels.In the present invention, the content of Si controls to be 0.10 ~ 0.30%.
Manganese Mn:Mn is solution strengthening element important in steel, can compensate the lower loss of strength caused of C content in steel, and expand austenite phase transformation district, is conducive to obtaining tiny low temperature phase change product, improves the low-temperature flexibility of steel.But its too high levels then can cause segregation in steel serious constantly, affects welding property.In the present invention, the content of Mn controls to be 1.50 ~ 1.95%.
Chromium Cr:Cr can improve hardening capacity and the intensity of steel effectively, suppresses polygonal ferrite and perlite to produce, promotes middle temperature transformation.In the present invention, Cr content controls 0.1 ~ 0.4%.
Molybdenum Mo:Mo can expand austenite phase transformation district, suppresses proeutectoid ferrite phase transformation, promotes that the tiny acicular ferrite containing highly dense dislocation is formed, and makes pipe line steel have good obdurability coupling.In the present invention, Mo content controls is 0.10 ~ 0.35%.
Copper Cu, nickel: Cu and Ni improves the intensity of steel by solution strengthening effect, and the interpolation of Ni can improve the red brittleness that Cu easily causes in steel.Cu can improve the solidity to corrosion of steel simultaneously, and Ni is then of value to the low-temperature flexibility improving steel.In the present invention, Cu content controls as≤0.30%, Ni content controls as≤0.20%.
Niobium Nb:Nb has strong Grain Refinement Effect, can postpone austenite recrystallization, reduces transformation temperature, promotes tiny acicular ferrite performance, improves intensity and the toughness of steel.In the present invention, Nb content controls is 0.06 ~ 0.10%.
Vanadium V, titanium Ti:V and Ti are important microalloy elements.Wherein V can supplement the deficiency of Nb precipitation strength in steel, can also improve the toughness of steel postwelding.Ti forms TiN in heat-processed, hinders the thick of this stage austenite crystal, improves the toughness of steel and heat affected zone thereof, and contributes to Nb solid solution performance strengthening effect.In the present invention, V content controls as≤0.06%, Ti content controls as≤0.02%.
Phosphorus P, sulphur S:P easily cause segregation, reduce the low-temperature flexibility of steel and worsen welding property in steel.S easily and Mn form MnS and be mingled with, affect the toughness of steel.Therefore, the content that the present invention should reduce P, S is as far as possible to reduce its disadvantageous effect to steel, and the content of P controls as P≤0.012%, and the content of S controls as S≤0.003%.
The coiled sheet that the present invention relates to also meets CE
pcm≤ 0.22%, to ensure that invention steel has good welding property.Wherein CE
pcm(%)=C+Si/30+ (Cr+Mn+Cu)/20+Mo/15+V/10+Ni/60+5B.
Beneficial effect of the present invention is:
1, from piping design angle, under the prerequisite that grade of steel, caliber and distribution pressure are constant, X80 piping design coefficient is promoted to 0.8 by 0.72 and brings the plurality of advantages such as pipeline wall thickness is thinning, cost reduction, but also brings tube wall to bear some difficult problems such as hoop stress increase, pipeline arrest toughness requirement raising, tube performance and homogeneity of structure raising.For ensureing the safety and reliability of conduit running, 0.8 design ratio X80 pipeline is had higher requirement to the mechanical property of its tubulation X80 steel, fracture toughness property, weldability and the stability etc. of above-mentioned performance on steel band length direction.
2, the X80 steel in the present invention, on the basis of low C height Mn system, with the addition of the alloying elements such as appropriate Cu, Ni, Cr, Mo, adopts Nb, V, Ti to carry out microalloying, and limits CE
pcm≤ 0.22% to ensure its solder flux performance.Simultaneously by being controlled slab long-width ratio in the operation of rolling, the accumulative composite factor such as draft, temperature schedule, final obtain have obdurability coupling excellent, along the X80 steel hot-rolled sheet coil of steel band length direction stable performance.
3, the present invention adopts reasonable component design and fabrication technology, successfully develops a kind of high-intensity high-tenacity 0.8 design ratio natural gas line X80 steel hot-rolled sheet coil.This coiled sheet properties meets the related request of PetroChina Company Limited. 0.8 design ratio X80 pipeline, has excellent obdurability coupling, good welding property, extremely low ductile-brittle transition temperature and higher stability (steel band length direction).
4, the present invention relates to the X80 hot-rolled coil yield strength R of satisfied 0.8 design ratio requirement
t0.5be 590 ~ 650MPa, tensile strength R
m>=680MPa, yield tensile ratio R
t0.5/ R
m≤ 0.91, unit elongation A
50mm>=35%;-20 DEG C of ballistic work KV
2monodrome>=280J, ballistic work KV
2monodrome>=310J, ductile-brittle transition temperature FATT50≤-60 DEG C;-15 DEG C of DWTT section shearing rate SA>=95%; Hardness value HV10≤255.
5, the present invention relates to the X80 hot-rolled coil head of satisfied 0.8 design ratio requirement, the surrender of middle part and afterbody and tensile strength properties undulating quantity≤40MPa.
Embodiment
In order to explain the present invention better, illustrate main contents of the present invention further below in conjunction with specific embodiment, but content of the present invention is not only confined to following examples.
Embodiment 1
The chemical composition content (weight percent) of the present embodiment steel is C:0.035, Si:0.30, Mn:1.75, P:0.010, S:0.0015, Cu:0.30, Cr:0.25, Ni:0.20, Mo:0.15, Nb:0.06, V:0.06, Ti:0.020, N:0.004, B:0.0001, surplus is Fe and inevitable tramp element, carbon equivalent ce
pcm(%)=0.18.
Through smelting and continuous casting process, acquisition has mentioned component, width is 1750mm continuously cast bloom, and long-width ratio is 4.50; Slab charging temperature is 610 DEG C, and reheating temperature is 1180; It is 76.0% that DEG C rough rolling step adds up draft, and roughing finishing temperature is 1020 DEG C; It is 70.0% that the finish rolling stage adds up draft, and finish rolling finishing temperature is 790 DEG C, and the coiling temperature of steel band after accelerating cooling is 370 DEG C.
Steel band head, middle part and afterbody tensile property and Hardness Surveillance result are as following table 1:
Table 1
Steel band impelling strength and drop weight tearing toughness assay are as following table 2:
Table 2
From the impelling strength result of upper table, there is not tough-brittle transition according to the X80 steel band of mentioned component and explained hereafter yet at-60 DEG C, i.e. FATT50≤-60 DEG C of steel band.
Embodiment 2
The chemical composition content (weight percent) of the present embodiment steel is C:0.050, Si:0.10, Mn:1.95, P:0.008, S:0.0020, Cu:0.15, Cr:0.10, Ni:0.10, Mo:0.35, Nb:0.10, V:0.05, Ti:0.017, N:0.003, B:0.0001, surplus is Fe and inevitable tramp element, carbon equivalent ce
pcm(%)=0.19.
Through smelting and continuous casting process, acquisition has mentioned component, width is 1650mm continuously cast bloom, and long-width ratio is 5.60; Slab charging temperature is 550 DEG C, and reheating temperature is 1220 DEG C; It is 74.5% that rough rolling step adds up draft, and roughing finishing temperature is 1080 DEG C; It is 71.9% that the finish rolling stage adds up draft, and finish rolling finishing temperature is 820 DEG C, and the coiling temperature of steel band after accelerating cooling is 440 DEG C.
Steel band head, middle part and afterbody tensile property and Hardness Surveillance result are as following table 3:
Table 3
Steel band impelling strength and drop weight tearing toughness assay are as following table 4:
Table 4
From the impelling strength result of upper table, there is not tough-brittle transition according to the X80 steel band of mentioned component and explained hereafter yet at-60 DEG C, i.e. FATT50≤-60 DEG C of steel band.
Embodiment 3
The chemical composition content (weight percent) of the present embodiment steel is C:0.070, Si:0.20, Mn:1.50, P:0.009, S:0.0018, Cu:0.05, Cr:0.40, Ni:0.05, Mo:0.10, Nb:0.08, V:0.04, Ti:0.013, N:0.002, B:0.0001, surplus is Fe and inevitable tramp element, carbon equivalent ce
pcm(%)=0.19.
Through smelting and continuous casting process, acquisition has mentioned component, width is 1600mm continuously cast bloom, and long-width ratio is 6.25; Slab charging temperature is 320 DEG C, and reheating temperature is 1200 DEG C; It is 73.8% that rough rolling step adds up draft, and roughing finishing temperature is 1050 DEG C; It is 72.6% that the finish rolling stage adds up draft, and finish rolling finishing temperature is 840 DEG C, and the coiling temperature of steel band after accelerating cooling is 480 DEG C.
Steel band head, middle part and afterbody tensile property and Hardness Surveillance result are as following table 5:
Table 5
Steel band impelling strength and drop weight tearing toughness assay are as following table 6:
Table 6
From the impelling strength result of upper table, there is not tough-brittle transition according to the X80 steel band of mentioned component and explained hereafter yet at-60 DEG C, i.e. FATT50≤-60 DEG C of steel band.
In addition to the implementation, the present invention also has other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims
Other unspecified part is prior art.Although above-described embodiment is to invention has been detailed description; but it is only the present invention's part embodiment; instead of whole embodiment, people can also obtain other embodiments according to the present embodiment under without creative prerequisite, and these embodiments all belong to scope.
Claims (2)
1., for an X80 steel hot-rolled sheet coil for natural gas line, the chemical component weight per-cent of described hot-rolled sheet coil is: C:0.035 ~ 0.070%, Si:0.10 ~ 0.30%, Mn:1.50 ~ 1.95%, P≤0.012%, S≤0.003%, Cu≤0.30%, Cr:0.10 ~ 0.40%, Ni≤0.20%, Mo:0.10 ~ 0.35%, Nb:0.06 ~ 0.10%, V≤0.06%; Ti≤0.02%, N≤0.005% and B≤0.0005%, all the other are Fe and inevitable tramp element,
This hot-rolled sheet coil also meets CE simultaneously
pcm≤ 0.22%, wherein:
CE
Pcm(％)＝C+Si/30+(Cr+Mn+Cu)/20+Mo/15+V/10+Ni/60+5B；
The yield strength of described hot-rolled sheet coil head, middle part and afterbody and tensile strength properties undulating quantity≤40MPa;
The yield strength R of described hot-rolled sheet coil
t0.5=590 ~ 650MPa, tensile strength R
m>=680MPa, yield tensile ratio R
t0.5/ R
m≤ 0.91, unit elongation A
50mm>=35%;-20 DEG C of ballistic work KV
2monodrome>=280J, ballistic work KV
2monodrome>=310J, ductile-brittle transition temperature FATT50≤-60 DEG C;-15 DEG C of DWTT section shearing rate SA>=95%; Hardness value HV10≤255; It is characterized in that: described X80 steel hot-rolled sheet coil is by heating of plate blank, roughing, finish rolling and batch and prepare hot-rolled sheet coil, and in described preparation process, operating parameters specifically controls as follows:
1) the heating of plate blank stage, slab charging temperature≤650 DEG C, slab reheating temperature is 1160 ~ 1250 DEG C, enter stove heating width of plate slab≤1750mm and long-width ratio is 4.50 ~ 6.25;
2) rough rolling step, roughing finishing temperature is 1010 ~ 1100 DEG C, and rough rolling process adds up draft >=70%;
3) the finish rolling stage, finish rolling finishing temperature is 780 ~ 860 DEG C, and finishing stands adds up draft >=70%;
4) coil ing one, coiling temperature is 350 ~ 500 DEG C.
2. described in claim 1 for a preparation method for the X80 steel hot-rolled sheet coil of natural gas line, the method is by heating of plate blank, roughing, finish rolling and batch and prepare hot-rolled sheet coil and it is characterized in that: in described preparation process, operating parameters specifically controls as follows:
1) the heating of plate blank stage, slab charging temperature≤650 DEG C, slab reheating temperature is 1160 ~ 1250 DEG C, enter stove heating width of plate slab≤1750mm and long-width ratio is 4.50 ~ 6.25;
2) rough rolling step, roughing finishing temperature is 1010 ~ 1100 DEG C, and rough rolling process adds up draft >=70%;
3) the finish rolling stage, finish rolling finishing temperature is 780 ~ 860 DEG C, and finishing stands adds up draft >=70%;
4) coil ing one, coiling temperature is 350 ~ 500 DEG C.
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Families Citing this family (6)
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| CN104073744B (en) * | 2014-05-30 | 2016-08-10 | 武汉钢铁(集团)公司 | The high tenacity X80 pipe line steel coiled sheet of thickness >=18.5mm and production method |
| CN104846293A (en) * | 2015-06-05 | 2015-08-19 | 武汉钢铁(集团)公司 | High-strength high-toughness steel plate and preparation method thereof |
| CN106119685A (en) * | 2016-06-23 | 2016-11-16 | 宝鸡石油钢管有限责任公司 | A kind of anti-deep water conquassation Offshore Drilling Riser and manufacture method thereof |
| CN111155035A (en) * | 2020-02-17 | 2020-05-15 | 本钢板材股份有限公司 | Large-angle grain boundary extra-thick specification X80 pipeline steel and preparation method thereof |
| CN111286592A (en) * | 2020-03-18 | 2020-06-16 | 本钢板材股份有限公司 | Production process of hot-rolled X80 pipeline steel with thickness specification of 21.4mm |
| CN111702006B (en) * | 2020-05-15 | 2022-09-13 | 山西太钢不锈钢股份有限公司 | Rolling method for improving quality stability of steel plate coil |
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| CN102400054A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | X80 pipeline steel used for longitudinal resistance welded pipe and method for producing its hot rolled coil |
| CN102534408A (en) * | 2012-02-01 | 2012-07-04 | 河北钢铁股份有限公司邯郸分公司 | X80 pipeline steel coil with low cost and high toughness and production method thereof |
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