CN101768703A - Grade X80 pipe line steel with low yield ratio and manufacturing method thereof - Google Patents
Grade X80 pipe line steel with low yield ratio and manufacturing method thereof Download PDFInfo
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Abstract
The invention provides grade X80 pipe line steel with low yield ratio and a manufacturing method thereof, belonging to the technical field of metallurgy; the pipe line steel consists of the following components by weight percent: 0.02-0.06% of C, 0.22-0.29% of Si, 1.6-1.9% of Mn, no greater than 0.002% of S, no greater than 0.012% of P, no greater than 0.045% of Al, 0.15-0.25% of Cu, 0.08-0.26% of Cr, 0.2-0.3% of Ni, 0.07-0.11% of Nb, 0.03-0.057% of V, 0.012-0.022% of Ti, 0.22-0.32% of Mo, no greater than 0.0043% of N, no greater than 0.0018% of Ca and the balance Fe. The manufacturing method comprises the following steps: melting and casting to obtain casting blank; heating and preserving warm; rolling the casting blank in two stages, wherein the start rolling temperature of the first stage of rolling is at 1100-1150 DEG C, the start rolling temperature of the second stage of rolling is at 920-940 DEG C, and the total rolling amount of the second stage is 68.4-72%; and after rolling, quickly cooling the casting blank, cooling the casting blank in the air, and cooling the casting blank to 340-490 DEG C at the cooling speed of 5-30 DEG C/s. The product of this invention has comparatively high strength as well as comparatively low yield ratio, namely excellent large-deformation resistance, can be used for normal transportation and supply of oil gas in earthquake-prone zones and constantly frozen zones, and has wide development prospect.
Description
Technical field
The invention belongs to metallurgical technology field, particularly a kind of grade X 80 pipe line steel with low yield ratio and manufacture method thereof.
Background technology
Pipeline transportation is long important way apart from transfer oil, Sweet natural gas.For improving the efficiency of operation of pipe-line transportation, reduce cost, pipeline transportation forward heavy caliber, high-pressure delivery direction develop.Under high pressure, heavy caliber transport condition, strict more requirement has been proposed for the strength of materials, toughness and weldability.
21 century, the development trend of oil, natural gas line was mainly reflected in: the high purification of steel-making, high intensity and toughness, good welding property and good corrosion resistance; Yet along with constantly exhausting of the energy, it is seismic region and permafrost band that pipeline develops one of challenging field of tool, and big viscous deformation may take place these geographic underground pipe spools.Therefore the inefficacy of pipeline is no longer by stress control, but controlled by strain.Proposed the new ideas of " based on the strain design method " in recent years abroad, like this, line pipe needs the performance of higher incompressible and tension strain.
At present, X80 level pipe line steel (pipe line steel of yield strength 〉=555MPa) all is typical acicular ferrite or bainite, organizing so mostly has higher intensity, but yield tensile ratio general also all higher (being higher than 0.9), so under special geological condition, the non-deformability of this high grade of steel pipe line steel relatively a little less than.
The deformability of steel pipe can be improved by improving strain-hardening property (reduction yield tensile ratio), and the strain-hardening property of steel is subjected to the strong influence of microstructure, can obtain bigger strain hardening performance by the polyphase microstructure of hard phase and relative soft phase composite.
Tang Di etc. have proposed " a kind of production method of the X80 of production level large-deformation resistance pipe line steel plate of moderate thickness ", and after its basic thought was two stage rolling, steel plate to below the ferrite transformation temperature 30～50 ℃, finally generated ferrite+bainite duplex structure through the air cooling relaxation.Therefore, the ferrite that obtains of this method is to generate in the high-temperature zone of austenite to ferrite transformation.How by adjusting the ratio of organizing of pipe line steel, the pipe line steel that is applicable to seismic region and permafrost band that obtains low yield strength ratio more and have a good over-all properties is present urgent problem.
Summary of the invention
At the problems referred to above, the invention provides a kind of grade X 80 pipe line steel with low yield ratio and manufacture method thereof.
The composition of grade X 80 pipe line steel with low yield ratio of the present invention is C 0.02～0.06% by weight percentage, Si 0.22～0.29%, Mn 1.6～1.9%, S≤0.002%, P≤0.012%, Al≤0.045%, Cu 0.15～0.25%, and Cr 0.08～0.26%, Ni0.2～0.3%, Nb 0.07～0.11%, V 0.03～0.057%, and Ti 0.012～0.022%, and Mo 0.22～0.32%, N≤0.0043%, Ca≤0.0018%, surplus are Fe, yield strength 565～685MPa, tensile strength 745～860MPa, yield tensile ratio 0.748～0.845.
Grade X 80 pipe line steel with low yield ratio of the present invention be organized as acicular ferrite+bainite+MA island.
To account for volume percent be 68～81% to acicular ferrite in the grade X 80 pipe line steel with low yield ratio tissue of the present invention, and bainite accounts for volume percent 2～30%, and it is 2～20% that the MA island accounts for volume percent.
The elongation after fracture of grade X 80 pipe line steel with low yield ratio of the present invention is 18～24% ,-20 ℃ of ballistic work 225～356.5J.
Method of the present invention is carried out according to the following steps:
1, smelt, pour into strand by mentioned component, strand is heated to 1180～1220 ℃, insulation 1～2h makes its abundant austenitizing, and guarantees the complete solid solution of microalloy element.
2, strand is carried out two sections rolling, first section rolling start rolling temperature is 1100～1150 ℃, makes original thick austenite sufficient recrystallize take place, refine austenite crystal grain; Second section rolling start rolling temperature is 920～940 ℃, finishing temperature is 800～856 ℃, the total reduction of subordinate phase is controlled at 68.4～72%, and the rolling hardened austenite that obtained in austenitic non-recrystallization district has been preserved a large amount of crystal boundaries, twin boundary, dislocation and deformation bands in the tissue.
3, the speed of cooling with 80～150 ℃/s is cooled to 600～710 ℃ after rolling the finishing, and air cooling is 4～85 seconds again, and the speed of cooling with 5～30 ℃/s is cooled to 340～490 ℃ then, obtains grade X 80 pipe line steel with low yield ratio.
In the aforesaid method, the cooling apparatus that adopts when cooling off with the speed of cooling of 80～150 ℃/s is a Ultrafast cooling device.
Method of the present invention is rolling when making crystal grain thinning improve intensity by two sections, has improved the low-temperature flexibility of product greatly; First section cooling makes the precipitate particle small and dispersed ground of Nb, Ti separate out in the acicular ferrite phase transformation by the ultrafast cold hardened austenite structure of having fixed, and improved the intensity of pipe line steel.The air cooling of short period of time makes that the acicular ferrite phase transformation is taken place, produced a certain amount of soft phase, the precipitation particles of Nb, Ti is also separated out in large quantities in this stage, and the cooling of subordinate phase has generated the MA island of hard phase bainite structure and disperse distribution, has improved the tensile strength of pipe line steel.
Group of products of the present invention is woven to tiny acicular ferrite+bainite+MA island, when the speed of cooling of subordinate phase is big (be not less than 24 ℃/s), bainite becomes the main hard phase (the MA island is less) in the tissue; When the subordinate phase speed of cooling hour (be not more than 6 ℃/s), the MA island becomes the main hard phase (bainite is less) in the tissue; This hard phase constitution bainite and MA island and soft phase constitution acicular ferrite form comparison reduction steel yield tensile ratio significant.Product of the present invention has lower yield tensile ratio when possessing higher-strength be good Chinese People's Anti-Japanese Military and Political College's deformability, and shortened the time of staying temperature of slab, improved rolling rhythm.The X80 level pipe line steel that manufacture method of the present invention is produced can be used for the normal transport and the supply of multiple band of earthquake and permafrost band oil gas, has vast potential for future development.
Description of drawings
Fig. 1 is the metallographic structure figure after the nitric acid alcohol reagent etch of the X80 level pipe line steel employing 4% in the embodiment of the invention 3 is handled.
Fig. 2 is that the X80 level pipe line steel in the embodiment of the invention 3 adopts the metallographic structure figure after Lepra reagent method etch is handled.
Fig. 3 is the X80 level pipe line steel transmission electron microscope photo figure in the embodiment of the invention 3.
Fig. 4 is the X80 level pipe line steel transmission electron microscope photo figure in the embodiment of the invention 3.
Fig. 5 is that the X80 level pipe line steel in the embodiment of the invention 4 adopts the metallographic structure figure after Lepra reagent method etch is handled.
Embodiment
The Ultrafast cooling device that adopts in the embodiment of the invention is the Ultrafast cooling device of Northeastern University's rolling technique and the exploitation of tandem rolling automatization National Key Laboratory, can reach 400 ℃/s to thickness 3mm steel plate speed of cooling.
In the embodiment of the invention, the total reduction of fs is controlled at 62～76%.
Embodiment 1
Smelt, pour into strand by set component, the composition of strand is by weight percentage: C 0.047%, and Si 0.22%, Mn1.89%, S 0.002%, and P 0.004%, Al 0.04%, and Cu 0.22%, and Cr 0.26%, Ni 0.25%, and Nb 0.1%, and V 0.057%, Ti 0.022%, Mo 0.23%, and N 0.0035%, and all the other are Fe.
Strand is heated to 1180 ℃, insulation 1h.
With strand carry out two sections rolling, first section rolling start rolling temperature is 1150 ℃, total reduction is 62.5%; Second section rolling start rolling temperature is 921 ℃, and finishing temperature is 856 ℃, and the total reduction of subordinate phase is controlled at 72%.
Speed of cooling with 80 ℃/s after rolling the finishing is cooled to 710 ℃, air cooling 4 seconds, and the speed of cooling with 24 ℃/s is cooled to 460 ℃ then; Air cooling is to room temperature.
X80 level pipe line steel finished product thickness 16mm, yield strength 585MPa, tensile strength 740MPa, yield tensile ratio 0.790, elongation after fracture is 18.9% ,-20 ℃ of ballistic work 356.5J.
To account for volume percent be 68% to acicular ferrite in the X80 level pipe line steel tissue, and bainite accounts for volume percent 30%, and it is 2% that the MA island accounts for volume percent.
Embodiment 2
Smelt, pour into strand by set component, the composition of strand is C 0.024% by weight percentage, and Si 0.24%, Mn1.89%, S 0.002%, and P 0.012%, Al 0.035%, and Cu 0.22%, and Cr 0.08%, Ni 0.24%, and Nb 0.081%, and V 0.03%, Ti 0.012%, and Mo 0.29%, and N 0.003%, Ca 0.0018%, and all the other are Fe.
Strand is heated to 1200 ℃, insulation 1.5h.
With strand carry out two sections rolling, first section rolling start rolling temperature is 1130 ℃, total reduction is 62%; Second section rolling start rolling temperature is 940 ℃, and finishing temperature is 840 ℃, and the total reduction of subordinate phase is controlled at 68.4%.
Speed of cooling with 96 ℃/s after rolling the finishing is cooled to 600 ℃, air cooling 5 seconds, and the speed of cooling with 18 ℃/s is cooled to 490 ℃ then; Air cooling is to room temperature.
X80 level pipe line steel finished product thickness 12mm, yield strength 595MPa, tensile strength 745MPa, yield tensile ratio 0.799, elongation after fracture is 21.1% ,-20 ℃ of ballistic work 328J.
To account for volume percent be 73% to acicular ferrite in the X80 level pipe line steel tissue, and bainite accounts for volume percent 22%, and it is 5% that the MA island accounts for volume percent.
Embodiment 3
Smelt, pour into strand by set component, the composition of strand is by weight percentage: C 0.06%, and Si 0.27%, Mn1.62%, S 0.0019%, and P 0.0049%, Al0.045%, Cu 0.15%, and Cr 0.11%, Ni 0.25%, and Nb 0.072%, and V 0.045%, Ti 0.022%, Mo 0.22%, and N 0.0043%, and all the other are Fe.
Strand is heated to 1220 ℃, insulation 2h.
With strand carry out two sections rolling, first section rolling start rolling temperature is 1100 ℃, total reduction is 62%; Second section rolling start rolling temperature is 930 ℃, and finishing temperature is 845 ℃, and the total reduction of subordinate phase is controlled at 68.4%.
Speed of cooling with 98 ℃/s after rolling the finishing is cooled to 610 ℃, air cooling 18 seconds, and the speed of cooling with 30 ℃/s is cooled to 340 ℃ then; Air cooling is to room temperature.
X80 level pipe line steel finished product thickness 12mm, yield strength 685MPa, tensile strength 860MPa, yield tensile ratio 0.797, elongation after fracture is 18.0% ,-20 ℃ of ballistic work 225J.
To account for volume percent be 74% to acicular ferrite in the X80 level pipe line steel tissue, and bainite accounts for volume percent 22.5%, and it is 3.5% that the MA island accounts for volume percent.
Adopt 4% nitric acid alcohol reagent etch processing grade X 80 pipe line steel with low yield ratio, its metallographic structure as shown in Figure 1.
Adopt Lepra reagent method etch to handle X80 level pipe line steel, its metallographic structure as shown in Figure 2, white is the MA island among the figure.
X80 level pipe line steel transmission electron microscope photo is respectively shown in Fig. 3 and 4.
Embodiment 4
Smelt, pour into strand by set component, the composition of strand is by weight percentage: C 0.06%, and Si 0.27%, Mn1.62%, S 0.0019%, and P 0.0049%, Al0.045%, Cu 0.15%, and Cr 0.11%, Ni 0.25%, and Nb 0.072%, and V 0.045%, Ti 0.022%, Mo 0.22%, and N 0.0043%, and all the other are Fe.
Strand is heated to 1220 ℃, insulation 2h.
With strand carry out two sections rolling, first section rolling start rolling temperature is 1100 ℃, total reduction is 62%; Second section rolling start rolling temperature is 930 ℃, and finishing temperature is 845 ℃, and the total reduction of subordinate phase is controlled at 68.4%.
Speed of cooling with 95 ℃/s after rolling the finishing is cooled to 650 ℃, air cooling 20 seconds, and the speed of cooling with 5 ℃/s is cooled to 450 ℃ then; Air cooling is to room temperature.
X80 level pipe line steel product thickness 12mm, yield strength 565MPa, tensile strength 755MPa, yield tensile ratio 0.748, elongation after fracture is 21.2% ,-20 ℃ of ballistic work 250J.
To account for volume percent be 78% to acicular ferrite in the X80 level pipe line steel tissue, and bainite accounts for volume percent 2%, and it is 20% that the MA island accounts for volume percent.
Adopt Lepra reagent method etch to handle X80 level pipe line steel, its metallographic structure as shown in Figure 5, white is the MA island among the figure.
Embodiment 5
Smelt, pour into strand by set component, the composition of strand is by weight percentage: C 0.036%, and Si 0.29%, Mn1.88%, S 0.001%, and P 0.005%, Al 0.04%, and Cu 0.25%, and Cr 0.12%, Ni 0.2%, and Nb 0.087%, and V 0.03%, Ti 0.014%, Mo 0.32%, and N 0.0035%, and all the other are Fe.
Strand is heated to 1200 ℃, insulation 1h.
With strand carry out two sections rolling, first section rolling start rolling temperature is 1125 ℃, total reduction is 76%; Second section rolling start rolling temperature is 930 ℃, and finishing temperature is 800 ℃, and the total reduction of subordinate phase is controlled at 70.8%.
Speed of cooling with 150 ℃/s after rolling the finishing is cooled to 675 ℃, air cooling 25 seconds, and the speed of cooling with 6 ℃/s is cooled to 470 ℃ then; Air cooling is to room temperature.
X80 level pipe line steel product thickness 7mm, yield strength 615MPa, tensile strength 805MPa, yield tensile ratio 0.764, elongation after fracture is 23.1% ,-20 ℃ of ballistic work 240J.
To account for volume percent be 81% to acicular ferrite in the X80 level pipe line steel tissue, and bainite accounts for volume percent 2%, and it is 17% that the MA island accounts for volume percent.
Embodiment 6
Smelt, pour into strand by set component, the composition of strand is by weight percentage: C 0.036%, and Si 0.29%, Mn1.88%, S 0.001%, and P 0.005%, Al 0.04%, and Cu 0.25%, and Cr 0.12%, Ni 0.2%, and Nb 0.087%, and V 0.03%, Ti 0.014%, Mo 0.32%, and N 0.0035%, and all the other are Fe.
Strand is heated to 1200 ℃, insulation 1h.
With strand carry out two sections rolling, first section rolling start rolling temperature is 1125 ℃, total reduction is 76%; Second section rolling start rolling temperature is 930 ℃, and finishing temperature is 800 ℃, and the total reduction of subordinate phase is controlled at 70.8%.
Speed of cooling with 150 ℃/s after rolling the finishing is cooled to 650 ℃, air cooling 85 seconds, and the speed of cooling with 27 ℃/s is cooled to 395 ℃ then; Air cooling is to room temperature.
X80 level pipe line steel product thickness 7mm, yield strength 680MPa, tensile strength 805MPa, yield tensile ratio 0.845, elongation after fracture is 21.4% ,-20 ℃ of ballistic work 231J.
To account for volume percent be 80% to acicular ferrite in the X80 level pipe line steel tissue, and bainite accounts for volume percent 11%, and it is 9% that the MA island accounts for volume percent.
Claims (4)
1. grade X 80 pipe line steel with low yield ratio, the composition that it is characterized in that this pipe line steel is C0.02～0.06% by weight percentage, and Si 0.22～0.29%, and Mn 1.6～1.9%, S≤0.002%, P≤0.012%, Al≤0.045%, Cu0.15～0.25%, Cr 0.08～0.26%, Ni 0.2～0.3%, and Nb 0.07～0.11%, and V 0.03～0.057%, Ti 0.012～0.022%, Mo 0.22～0.32%, N≤0.0043%, Ca≤0.0018%, surplus is Fe, yield strength 565～685MPa, tensile strength 745～860MPa, yield tensile ratio 0.748～0.845; Pipe line steel be organized as acicular ferrite+bainite+MA island.
2. a kind of grade X 80 pipe line steel with low yield ratio according to claim 1, the elongation after fracture that it is characterized in that described pipe line steel are 18～24% ,-20 ℃ of ballistic work 225～356.5J.
3. a kind of grade X 80 pipe line steel with low yield ratio according to claim 1, the volume percent that it is characterized in that acicular ferrite in the described pipe line steel is 68～81%, the volume percent 2～30% of bainite, the volume percent on MA island are 2～20%.
4. the manufacture method of the described grade X 80 pipe line steel with low yield ratio of claim 1 is characterized in that carrying out according to the following steps:
(1) smelts, pours into strand, the composition of strand is C 0.02～0.06% by weight percentage, Si 0.22～0.29%, and Mn 1.6～1.9%, S≤0.002%, P≤0.012%, Al≤0.045%, Cu 0.15～0.25%, and Cr 0.08～0.26%, Ni0.2～0.3%, Nb 0.07～0.11%, and V 0.03～0.057%, and Ti 0.012～0.022%, Mo 0.22～0.32%, N≤0.0043%, Ca≤0.0018%, surplus is Fe, strand is heated to 1180～1220 ℃, insulation 1～2h;
(2) strand is carried out two sections rolling, first section rolling start rolling temperature is 1100～1150 ℃; Second section rolling start rolling temperature is 920～940 ℃, and finishing temperature is 800～856 ℃, and the total reduction of subordinate phase is controlled at 68.4～72%;
(3) speed of cooling with 80～150 ℃/s is cooled to 600～710 ℃ after rolling the finishing, and air cooling is 4～85 seconds again, and the speed of cooling with 5～30 ℃/s is cooled to 340～490 ℃ then.
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