CN102465235A - X100 anti-large deformation pipe steel and manufacturing technology thereof - Google Patents
X100 anti-large deformation pipe steel and manufacturing technology thereof Download PDFInfo
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Abstract
The invention discloses X100 anti-large deformation pipe steel and a manufacturing technology thereof. The X100 anti-large deformation pipe steel comprises: by weight, 0.01 to 0.07% of C, 0.1 to 0.6% of Si, 1.5 to 2.2% of Mn, less than or equal to 0.015% of P, less than or equal to 0.004% of S, 0.03 to 0.1% of Nb, 0.005 to 0.03% of Ti, 0.10 to 0.40% of Mo, less than or equal to 0.50% of Cu, less than or equal to 0.50% of Ni and the balance Fe. The manufacturing technology is characterized in that 1, in a plate blank reheating process, a plate blank heating temperature is in a range of 1100 to 1250 DEG C; 2, in a control rolling process, recrystallized zone control rolling is carried out and then unrecrystallized zone control rolling is carried out, wherein an end temperature of the recrystallized zone control rolling is controlled in a range of 1000 to 1080 DEG C; an initial temperature of the unrecrystallized zone control rolling is controlled in a range of 880 to 950 DEG C; and an end temperature of the unrecrystallized zone control rolling is controlled in a range of 760 to 850 DEG C; and 3, in a control cooling process, a rolled steel plate is subjected to air cooling, and then is fed into laminar flows for accelerated cooling when the rolled steel plate is cooled to a temperature lower than a phase transformation point Ar3 by 10 to 60 DEG C, wherein a cooling rate of the laminar flow accelerated cooling is in a range of 20 to 40 DEG C per second and an end temperature is in a range of 250 to 450 DEG C.
Description
Technical field
The present invention relates to a kind of pipe line steel and ME thereof, relate in particular to a kind of X100 large-deformation-resistance pipeline steel and ME thereof, belong to technical field of ferrous metallurgy.
Background technology
Current, along with country strengthens the infrastructure investment dynamics, the development in oil and gas pipes field is very swift and violent, and behind the transfering natural gas from the west to the east two wires, three-way, the four lineman's journeys of transferring natural gas from the west to the east have been included planning in.According to planning, ventilation was run through in western three-way all fronts in 2014, will network with main pipeline networks such as a western line, western two wires, one two wires, capital, Shan, the east line sendings of river gas when the time comes, with forming a Sweet natural gas basis pipe network of passing through from east to west, stretching from the north to the south; 2015, comprise the operation of also will completing of Xisi line, middle remote pipeline, 17 three-way natural gas line projects of capital, Shan.
The vigorous growth of oil and gas pipes industry; Bring unprecedented opportunity to develop for the pipe line steel field; Simultaneously also making the pipe line steel field face arduous challenge, is the safety of the long distance that guarantees under severe environment such as high and cold, deep-sea, desert, earthquake and geologic hazard, to use, high pressure, big flow gas pipe line, and the quality and the performance of pipe line steel proposed the more and more requirement of harshness; Especially based on the large-deformation-resistance pipeline steel of strain design, be one of pipe line steel field of developing tool challenge; At present less about the research report of X100 large-deformation-resistance pipeline steel, domestic do not have relevant patent documentation report as yet.
Summary of the invention
The technical problem that the present invention will solve provides a kind of X100 large-deformation-resistance pipeline steel and ME thereof.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of X100 large-deformation-resistance pipeline steel provided by the invention according to its chemical ingredients proportioning of weight percent is: C:0.01～0.07%, Si:0.1～0.6%; Mn:1.5～2.2%, P :≤0.015%, S :≤0.004%; Nb:0.03～0.1%, Ti:0.005～0.03%, Mo:0.10～0.40%; Cu :≤0.50%, Ni :≤0.50%, all the other are Fe.
The ME of a kind of X100 large-deformation-resistance pipeline steel provided by the invention comprises converter or electrosmelting, external refining, vacuum-treat, continuous casting, slab reheat, controlled rolling, controlled chilling operation;
Through smelting, external refining, vacuum-treat, continuous casting working procedure, make slab according to described chemical ingredients;
In said slab reheat operation, slab heating temperature is: 1100 ℃～1250 ℃;
In said controlled rolling operation; At first carry out the recrystallization zone controlled rolling; Carry out the controlled rolling of non-recrystallization district then, wherein, the final temperature of recrystallization zone controlled rolling is controlled at 1000 ℃～1080 ℃; The beginning rolling temperature of non-recrystallization district controlled rolling is controlled at 880 ℃～950 ℃, stops rolling temperature and is controlled at 760 ℃～850 ℃;
In said controlled rolling operation, to the control of rolling pass and draught: when the recrystallization zone is rolling, reduction in pass >=15%, accumulative total total reduction >=60%, thereby to realize the perfect recrystallization crystal grain thinning; When the non-recrystallization district was rolling, compression ratio was controlled at more than 3.5 times.
According to a kind of preferred implementation of the ME of said X100 large-deformation-resistance pipeline steel, wherein, in said controlled chilling operation, adopt two stage technology for controlled cooling to carry out processing under cooling to rolling the back steel plate:
Fs is cooled to air cooling, and speed of cooling is 1 ℃/s～3 ℃/s, and cooling termination temperature is below the transformation temperature Ar3 10～60 ℃, has 10%～30% proeutectoid ferrite to generate in the tissue of steel plate;
Subordinate phase is cooled to laminar flow and quickens cooling, and speed of cooling is 20～40 ℃/s, and cooling termination temperature is 250～450 ℃, with the steel plate air cooling behind the controlled chilling to room temperature; In the laminar flow accelerating cooling process, the remaining supercooled austenite that do not change changes ferrite bainite and M/A into, thereby finally obtains the heterogeneous structure of ferritic+bainite+M/A.
A kind of X100 large-deformation-resistance pipeline steel provided by the invention; Aspect Composition Control; Take the composition design concept of low C and high Mn, Si, improved austenitic stability, thereby effectively reduce in the large-deformation-resistance pipeline steel production process harsh requirement technology; Make in the cooling range of air cooling broad in the stage, guarantee to have the generation of the proeutectoid ferrite of (10%～30%) in right amount.
C, Mn, the Si concrete effect in steel:
C is most economical in the steel; The most basic strengthening element through solution strengthening and precipitation strength the intensity that improves steel is had effect clearly, but the raising of C content is to the plasticity of steel; Toughness and welding property have negative impact; Especially in the X100 pipe line steel, because the content of various alloying elements is all higher, so carbon equivalent and weld seam susceptibility index are higher; Reduce C content in this case, help to improve the toughness and the plasticity of steel on the one hand, help improving the welding property of steel on the other hand.Therefore, adopt the mentality of designing of low C in the X100 large-deformation-resistance pipeline steel, C content is controlled at 0.01～0.07%.
Mn is the intensity that improves steel through solution strengthening, is the topmost element that compensation reduces the loss of strength that causes in the pipe line steel because of C content.Mn still enlarges the element of γ phase region, helps to obtain tiny phase-change product, can improve the toughness of steel, reduces ductile-brittle transition temperature.Therefore, adopt the mentality of designing of high Mn in the X100 large-deformation-resistance pipeline steel, Mn content is controlled at 1.5～2.2%.
Si improves the chemical potential of C, promotes the uphill diffusion of C, and its Si content in the ferritic under uniform temp has promoted that far above the Si content in the austenite C in the ferritic spreads in austenite, improved the carbon content in the austenite.Therefore, though Si is the element that enlarges the ferritic phase region, after it adds in the steel; On kinetics, can postpone separating out of carbide in the austenite; Stable austenite is played promoter action, and stable austenite is in continuing process of cooling, and temperature drops to the Ms point and transforms into martensite when following; Thereby improved the content of the hard phase M/A of conduct in the pipe line steel, improved tensile strength; In addition, hard phase constitution also can improve YIELD STRENGTH through quiet strengthening effect, thereby the ys of pipe line steel is greatly improved, and satisfies in the API standard X100 pipe line steel performance demands.Therefore, the present invention adopts the mentality of designing of high Si, and Si content is controlled at: 0.1～0.60%.
A kind of X100 large-deformation-resistance pipeline steel ME provided by the invention through controlled rolling, controlled chilling, obtains to have the pipe line steel of ferritic+bainite+M/A heterogeneous structure.Ferritic content is 10%～30% in its tissue, and the content of M/A is 2%～5%, and all the other are bainite; Its cross directional stretch and impact mechanical performance satisfy: ys>=690MPa, tensile strength>=780MPa, yield tensile ratio≤0.88; Summer is than the impact property of v-notch: when test temperature is-20 ℃, and CVN>=150J; Block hammer performance: when test temperature is-15 ℃, average shear area SA%>=85%; The longitudinal stretching mechanical property satisfies: ys>=650MPa, tensile strength>=810MPa, yield tensile ratio≤0.85, uniform elongation>=7%.
The present invention has following characteristics:
(1) the present invention adopts the composition design concept of low C, high Mn.Reduce C content, improved the plasticity and the toughness of X100 large-deformation-resistance pipeline steel, improved welding property; The content that improves Mn has remedied the loss of strength that causes because carbon content reduces, and helps to obtain tiny phase-change product, improves the toughness of steel, reduces ductile-brittle transition temperature; Austenite has been stablized in the raising of Mn content in addition, and in the process air cooler subsequently, the ferritic amount of separating out is unlikely too much in awide temperature range, promptly guarantees to generate an amount of proeutectoid ferrite.
(2) the present invention adopts the composition design concept of high Si.Owing to improve the content of Si, promoted the uphill diffusion of carbon, promoted that C spreads in the ferritic in austenite, improved the carbon content in the austenite.It plays promoter action to stable austenite, and stable austenite drops to Ms point in temperature and transforms into martensite when following in continuing process of cooling, thereby has improved in the X100 large-deformation-resistance pipeline steel content of phase M/A firmly, has improved tensile strength; In addition, hard phase constitution also can improve YIELD STRENGTH through quiet strengthening effect, thereby makes the ys of pipe line steel be enhanced.
(3) the present invention has adopted air cooling and laminar flow to quicken two stage of refrigerative technology for controlled cooling, obtains the heterogeneous structure of ferritic+bainite+M/A.Adopt the X100 large-deformation-resistance pipeline steel that is organized as bainite+M/A two-phase of online thermal treatment (HOP) explained hereafter to compare with Japanese JFE; Contain a certain amount of proeutectoid ferrite in the X100 large-deformation-resistance pipeline steel of the present invention; Born a part of viscous deformation, thereby made uniform elongation higher relatively; And adopt higher speed of cooling in the laminar flow accelerating cooling process, refinement effective grain-size of tissue, remedied the loss of strength that causes because of ferritic separating out of air cooling stage.In addition, the present invention considers the particular case of domestic steel mill production unit, does not adopt online thermal treatment (HOP) technology, but adopts cooling controlling and rolling controlling process, thereby has simplified the technological process of production, has improved the technology controlling and process suitability greatly.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
The optical microstructure's photo that obtains among the ME embodiment 1 of Fig. 1 X100 large-deformation-resistance pipeline steel of the present invention;
The SEM that obtains among the ME embodiment 1 of Fig. 2 X100 large-deformation-resistance pipeline steel of the present invention organizes photo;
The distribution picture of the M/A that obtains among the ME embodiment 1 of Fig. 3 X100 large-deformation-resistance pipeline steel of the present invention;
The effective grain size distribution figure that obtains among the ME embodiment 1 of Fig. 4 X100 large-deformation-resistance pipeline steel of the present invention;
The optical microstructure's photo that obtains among the ME embodiment 2 of Fig. 5 X100 large-deformation-resistance pipeline steel of the present invention;
The SEM that obtains among the ME embodiment 2 of Fig. 6 X100 large-deformation-resistance pipeline steel of the present invention organizes photo;
The distribution picture of the M/A that obtains among the ME embodiment 2 of Fig. 7 X100 large-deformation-resistance pipeline steel of the present invention;
The effective grain size distribution figure that obtains among the ME embodiment 2 of Fig. 8 X100 large-deformation-resistance pipeline steel of the present invention.
Embodiment
To combine accompanying drawing of the present invention below, technical scheme of the present invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
A kind of X100 large-deformation-resistance pipeline steel provided by the invention according to its chemical ingredients proportioning of weight percent is: C:0.01～0.07%, Si:0.1～0.6%; Mn:1.5～2.2%, P :≤0.015%, S :≤0.004%; Nb:0.03～0.1%, Ti:0.005～0.03%, Mo:0.10～0.40%; Cu :≤0.50%, Ni :≤0.50%, all the other are Fe.
The ME of a kind of X100 large-deformation-resistance pipeline steel provided by the invention comprises converter or electrosmelting, external refining, vacuum-treat, continuous casting, slab reheat, controlled rolling, controlled chilling operation;
(1),, makes continuous casting steel billet through smelting, external refining, vacuum-treat, continuous casting working procedure according to described chemical ingredients;
(2) in said slab reheat operation; Said continuous casting steel billet is sent into soaking pit carry out equal thermal treatment, Heating temperature is 1100 ℃～1250 ℃, and be 150min～240min heat-up time; Make the abundant solid solutions of alloying element such as Ti, Nb, concrete soaking time is confirmed according to the thickness of slab;
(3) after said continuous casting steel billet is come out of the stove through equal thermal treatment, it is carried out high-pressure water descaling, remove the iron scale that the continuous casting steel billet surface produces in heat-processed; Continuous casting steel billet temperature behind high-pressure water descaling is about 1150 ℃;
(4) in said controlled rolling operation, at first the continuous casting steel billet after the de-scaling is carried out the recrystallization zone controlled rolling, carries out the controlled rolling of non-recrystallization district then,
Wherein, the final temperature of recrystallization zone controlled rolling is controlled at 1000～1080 ℃, to the control of rolling pass and draught: and reduction in pass >=15%, accumulative total total reduction >=60%, thereby to realize the perfect recrystallization crystal grain thinning; Because the draught of rolling last passage in recrystallization zone is relevant with the impelling strength of pipe line steel, thus the draught of the rolling final pass in recrystallization zone be controlled at >=20%.
The beginning rolling temperature of non-recrystallization district controlled rolling is controlled at 880～950 ℃, stops rolling temperature and is controlled at 760～850 ℃; The rolling compression ratio in non-recrystallization district is controlled at more than 3.5 times;
In said controlled chilling operation, adopt two stage technology for controlled cooling to carry out processing under cooling to rolling the back steel plate:
Fs is cooled to air cooling, and speed of cooling is 1 ℃/s～3 ℃/s, and cooling termination temperature is below the transformation temperature Ar3 10～60 ℃, has 10%～30% proeutectoid ferrite to generate in the tissue of steel plate;
Subordinate phase is cooled to laminar flow and quickens cooling, and speed of cooling is 20～40 ℃/s, and cooling termination temperature is 250～450 ℃, with the steel plate air cooling behind the controlled chilling to room temperature; In the laminar flow accelerating cooling process, the remaining supercooled austenite that do not change changes ferrite bainite and M/A into, thereby finally obtains the heterogeneous structure of ferritic+bainite+M/A.
Through technological process provided by the invention, obtain to have the X100 level large-deformation resistance pipe line steel of ferritic+bainite+M/A heterogeneous structure; Ferritic content is 10%～30% in its tissue, and the content of M/A is 2%～5%, and all the other are bainite; Its cross directional stretch and impact mechanical performance satisfy: ys>=690MPa, tensile strength>=780MPa; Yield tensile ratio≤0.88; Summer is than the impact property of v-notch: when test temperature is-20 ℃; CVN>=150J, block hammer performance: when test temperature is-15 ℃, average shear area SA%>=85%; The longitudinal stretching mechanical property satisfies: ys>=650MPa, tensile strength>=810MPa, yield tensile ratio≤0.85, uniform elongation>=7%.
The chemical ingredients (wt%) of the X100 level large-deformation resistance pipe line steel of being developed is: C accounts for 0.046, and Si accounts for 0.34, and Mn accounts for 1.94, and Nb accounts for 0.06, and Ti accounts for 0.008, and Mo accounts for 0.25, and Ni accounts for 0.27, and Cu accounts for 0.26, P≤50ppm, S≤50ppm.
The strand that will meet the composition requirement is delivered in 1200 ℃ the soaking pit, behind the insulation 150min, through high-pressure water descaling, removes the iron scale on the strand, gets into two stage rolling then; Fs is rolling rolling in the recrystallization zone, and rolling beginning temperature is 1100 ℃, and finishing temperature is 1050 ℃; Rolling through multi-pass, strand is rolled to 81mm, wherein the draught of each passage is respectively 18%, 20%, 22%, 22%, 24%, and the accumulation total reduction is 70%.
Intermediate blank is treated temperature to 900 ℃ before finishing mill, beginning subordinate phase rolling is that the non-recrystallization district is rolling, and start rolling temperature is 900 ℃, and finishing temperature is 830 ℃, and compression ratio is 3.7.
After subordinate phase was rolling, with steel plate air cooling to 700 ℃, its used time was 60s, got into laminar flow then and quickened cooling, and speed of cooling is 25 ℃/s, and it is 450 ℃ that laminar flow quickens the refrigerative end temp.Quicken the heterogeneous structure that two stage of refrigerative cooling system finally obtains ferritic+bainite+M/A through air cooling+laminar flow, like Fig. 1, Fig. 2, shown in Figure 3, wherein ferrite content is 15%, and M/A content is 2.1%, and all the other are ferrite bainite; Effective grain-size of tissue is divided as shown in Figure 4, and its average effective grain-size is 2.87 μ m.
X100 large-deformation-resistance pipeline steel to embodiment 1 preparation carries out horizontal and vertical mechanical property detection.
Its cross directional stretch and impact property detected result are following: ys R
T0.5: 690MPa, tensile strength R
m: 820MPa, yield tensile ratio: 0.84, elongation after fracture: 28%, Charpy-V impact power CVN
(20 ℃): 185J, drop hammer and tear average shear area SA%
(15 ℃): 90%.
Its tensile performance in wale-wise detected result is following: ys R
T05: 655MPa, tensile strength R
m: 815MPa, yield tensile ratio: 0.80, uniform elongation uEl:7.8%.
The chemical ingredients (wt%) of the X100 level large-deformation resistance pipe line steel of being developed is: C accounts for 0.045, and Si accounts for 0.44, and Mn accounts for 1.92, and Nb accounts for 0.061, and Ti accounts for 0.02, and Mo accounts for 0.25, and Ni accounts for 0.27, and Cu accounts for 0.25, P≤50ppm, S≤50ppm.
The strand that will meet the composition requirement is delivered in 1200 ℃ the soaking pit, behind the insulation 150min, through high-pressure water descaling, removes the iron scale on the strand, gets into two stage rolling then.Fs is rolling rolling in the recrystallization zone, and rolling beginning temperature is 1130 ℃, and finishing temperature is 1070 ℃; Rolling through multi-pass, strand is rolled to 81mm, wherein the draught of each passage is respectively 18%, 20%, 22%, 22%, 24%, and the accumulation total reduction is 70%.
Intermediate blank is treated temperature to 900 ℃ before finishing mill, beginning subordinate phase rolling is that the non-recrystallization district is rolling, and start rolling temperature is 900 ℃, and finishing temperature is 780 ℃, and compression ratio is 3.7.
After subordinate phase was rolling, with steel plate air cooling to 690 ℃, its used time was 61s, got into laminar flow then and quickened cooling, and speed of cooling is 32 ℃/s, and it is 420 ℃ that laminar flow quickens the refrigerative end temp.Quicken the heterogeneous structure that two stage of refrigerative cooling system finally obtains ferritic+bainite+M/A through air cooling+laminar flow, like Fig. 5, Fig. 6, shown in Figure 7, wherein ferrite content is 12%, and M/A content is 3.5%, and all the other are ferrite bainite; Effective grain-size of tissue is divided as shown in Figure 8, and its average effective grain-size is 2.04 μ m.
X100 large-deformation-resistance pipeline steel to embodiment 2 preparations carries out horizontal and vertical mechanical property detection.
Its cross directional stretch and impact property detected result are following: ys R
T0.5: 700MPa, tensile strength R
m: 835MPa, yield tensile ratio: 0.84, elongation after fracture: 31%, Charpy-V impact power CVN
(20 ℃): 184J, drop hammer and tear average shear area SA%
(15 ℃): 90%.
Its tensile performance in wale-wise detected result is following: ys R
T0.5: 665MPa, tensile strength R
m: 825MPa, yield tensile ratio: 0.81, uniform elongation uEl:7.5%.
The above; Be merely embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by said protection domain with claim.
Claims (3)
1. an X100 large-deformation-resistance pipeline steel is characterized in that, according to its chemical ingredients proportioning of weight percent is: C:0.01～0.07%, Si:0.1～0.6%; Mn:1.5～2.2%, P :≤0.015%, S :≤0.004%; Nb:0.03～0.1%, Ti:0.005～0.03%, Mo:0.10～0.40%; Cu :≤0.50%, Ni :≤0.50%, all the other are Fe.
2. the ME of an X100 large-deformation-resistance pipeline steel comprises converter or electrosmelting, external refining, vacuum-treat, continuous casting, slab reheat, controlled rolling, controlled chilling operation; It is characterized in that,
Through smelting, external refining, vacuum-treat, continuous casting working procedure, make slab according to the described chemical ingredients of claim 1;
In said slab reheat operation, slab heating temperature is: 1100 ℃～1250 ℃;
In said controlled rolling operation; At first carry out the recrystallization zone controlled rolling; Carry out the controlled rolling of non-recrystallization district then, wherein, the final temperature of recrystallization zone controlled rolling is controlled at 1000 ℃～1080 ℃; The beginning rolling temperature of non-recrystallization district controlled rolling is controlled at 880 ℃～950 ℃, stops rolling temperature and is controlled at 760 ℃～850 ℃;
In said controlled rolling operation, to the control of rolling pass and draught: when the recrystallization zone is rolling, reduction in pass >=15%, accumulative total total reduction >=60%, thereby to realize the perfect recrystallization crystal grain thinning; When the non-recrystallization district was rolling, compression ratio was controlled at more than 3.5 times.
3. the ME of X100 large-deformation-resistance pipeline steel according to claim 2 is characterized in that, in said controlled chilling operation, adopts two stage technology for controlled cooling to carry out processing under cooling to rolling the back steel plate:
Fs is cooled to air cooling, and speed of cooling is 1 ℃/s～3 ℃/s, and cooling termination temperature is below the transformation temperature Ar3 10～60 ℃, has 10%～30% proeutectoid ferrite to generate in the tissue of steel plate;
Subordinate phase is cooled to laminar flow and quickens cooling, and speed of cooling is 20～40 ℃/s, and cooling termination temperature is 250～450 ℃, with the steel plate air cooling behind the controlled chilling to room temperature; In the laminar flow accelerating cooling process, the remaining supercooled austenite that do not change changes ferrite bainite and M/A into, thereby finally obtains the heterogeneous structure of ferritic+bainite+M/A.
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| CN104907335A (en) * | 2015-06-25 | 2015-09-16 | 江阴兴澄特种钢铁有限公司 | Supercooling austenite rolling method suitable for carbon-manganese medium steel plate |
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| CN102465235B (en) | 2013-06-05 |
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