CN103866204B - The large sstrain X80 dual phase sheet steel that the large soft reduction process of a kind of low temperature is produced - Google Patents
The large sstrain X80 dual phase sheet steel that the large soft reduction process of a kind of low temperature is produced Download PDFInfo
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Abstract
The invention belongs to low-alloy high-strength pipe line steel field, more specifically the large sstrain X80 dual phase sheet steel of the large soft reduction process production of a kind of low temperature, it is made up of following component by weight percentage, C:0.05 ~ 0.07%, Si:0.25 ~ 0.35%, Mn:1.40 ~ 1.80%, P≤0.01%, S≤0.003%, Nb:0.01 ~ 0.04%, Ti:0.01 ~ 0.02%, Mo≤0.35%, Cu≤030%:Cr≤0.35%, Ni≤0.030%, N≤40ppm, O≤20ppm, H≤1.2ppm rest part comprises Fe and inevitable impurity, the invention has the beneficial effects as follows: rolling technology of the present invention utilizes high pressure water to laminar cooling process, effective crystal grain thinning and enhancing productivity, Unhydrated cement adopts low temperature large pressure multi-pass cold rolling, finally obtain proeutectoid ferrite+ferrite bainite tissue, gained steel plate yield strength Rt0.5 is 480MPa ~ 560MPa, tensile strength Rm is 770MPa ~ 800MPa, yield tensile ratio Rt0.5/Rm≤0.75,-20 DEG C of Charpy-V impact power >=350J,-15 DEG C of shear area >=95% that drop hammer, uniform elongation UEL >=12, steel plate non-deformability is strong, stress ratio is Rt2.0/Rt1.0 >=1.09, Rt1.5/Rt0.5 >=1.15.
Description
Technical field
The invention belongs to low-alloy high-strength pipe line steel manufacturing technology field, the large sstrain X80 dual phase sheet steel of the large soft reduction process production of a kind of low temperature more specifically.
Background technology
Along with the fast development of China's oil petrochemical industry, within from now on period, country is by newly-built a large amount of pipe laying, to meet the development need of national economy, increasing pipeline service condition is more harsh from now on, geologic media becomes increasingly complex, also more and more higher to the specification of quality of pipe line steel.Because pipe-line constantly extends to permafrost or seismic region, when laying the line in these regions, strata deformation may cause steel pipe comparatively large sstrain, and therefore, pipe line steel used must have the deformability preventing local bending and the fracture of pipeline butt girth welding seam.The method improving oil gas pipeline steel pipe non-deformability is the wall thickness increasing steel pipe, but this certainly will increase the construction cost of pipe, and employing has high deformability steel pipe and can obtain high steel pipe non-deformability under the prerequisite not increasing wall thickness.
The tissue of high-performance pipe line steel experienced by the transformation of the types of tissue such as ferrite-pearlite type, acicular ferrite type, granular bainite type and lower bainite type.Domestic and international research shows, larger strain hardening performance can be obtained with the dual phase microstructure of relative soft phase composite mutually by hard, Japan and other countries iron and steel enterprise has developed ferrite+bainite and bainite+martensite (MA) two class large-deformation-resistance pipeline steel, current domestic steel mill and pipe factory successfully develop X70 grade of steel large-deformation-resistance pipeline steel, and be successfully applied to middle remote Sweet natural gas/crude oil pipeline engineering, achieve large-deformation-resistance pipeline steel production domesticization.
In recent years, particularly Central Asia pipe line steel is laid, for improving the safety performance of air input efficiency and petroleum transport, the over-all propertieies such as higher category, thicker, toughness index require higher based on the X80 large-strain pipeline steel of stress design principle favored, increasing experts and scholars research and analyse
For meeting the requirements such as X80 pipeline steel strength, toughness, stain resistance energy, weldability, intensity homogeneity, just must formulate according to large-deformation-resistance pipeline steel standard at the beginning of production technique and Composition Design, adopt the system that these technology can provide safe and reliable, ensure economic solution, the innovative design based on stress design solves the practical problems of high-strength line-pipe steel application in engineering conveying simultaneously.The present invention is directed to many difficult problems of producing in large-deformation-resistance pipeline steel project, in conjunction with on-the-spot production practice and tooling, adopt suitable controlled rolling, Controlled cooling process (TMCP technique), steel plate is finally obtained soft, hard duplex structure type, and strict control is soft, hard phase constitution ratio, by soft, hard dual phase microstructure obtains larger strain hardening performance, define the efficient and rational process control technology of advanced person of large pressure rolling and laminar flow cooling technology process control from Composition Design to low temperature, achieve the stable of large-deformation-resistance pipeline steel plate, produce in enormous quantities.For the effect advancing the production domesticization of large-deformation-resistance pipeline steel, large-scale industrial production serves positive important.
The research of the relevant Chinese People's Anti-Japanese Military and Political College of JFE company of Japan distortion X80 hot-rolled steel sheet, but the organization design of Japanese Chinese People's Anti-Japanese Military and Political College distortion X80/X100 steel plate is bainite+Ma Ao island (B+M/A) duplex structure, technological design is TMCP+HOP technique, therefore Chinese People's Anti-Japanese Military and Political College's distortion X80/X100 Pipeline Steel Plate that they are produced is obtained by HOP technique, their tissue is made up of bainite+Ma Ao island (B+M/A) dual phase microstructure, to be steel plate carry out corresponding thermal treatment process directly entering equipment for Heating Processing after finish rolling system to HOP process characteristic, the armor plate strength produced under this processing condition is stablized, performance inconsistency little but processability and poor toughness, and the domestic this duplex structure filed an application is by the multicomponent microalloying design of low C and the acquisition of low temperature large Reduction Technology, duplex structure is made up of ferrite+ferrite bainite dual phase microstructure, can realize the matched well of armor plate strength and toughness.
The patent of invention comparatively close with the present invention has: 1) Chinese patent, Application Number (patent): CN200910076066.8, a kind of method of producing X80 level large-deformation resistance pipe line steel plate of moderate thickness; 2) Chinese patent, Application Number (patent): 201310022403.1, a kind of method obtaining X80 steel-grade duplex structure gross distortion pipe line steel; 3) Chinese patent, Application Number (patent): 20121003018.8, a kind of low-cost and high-performance X80 pipe line steel and production method thereof; 4) Chinese patent, Application Number (patent): 201010530202.9, a kind of low cost, high tenacity X80 large-deformation-resistance pipeline steel and production method; 5) Chinese patent, Application Number (patent): 200910048140.5, a kind of X80 pipe line steel Wide and Thick Slab and manufacture method thereof; 6) Chinese patent, Application Number (patent): 201310230259.0, a kind of production method of X80 pipe line steel; 7) Chinese patent, Application Number (patent): 200610096513.2, manufacturing technique of low compression ratio high grade pipe line steel.
In above patent documentation 1), 2), 4), 7) be X80 pipe line steel based on stress design, there is property of resisting large deformation, all the other Jun Shi single organization pipe line steels.1) in the product composition design of announcing, P content maximum value is 0.012%, S content maximum value 0.004%, and carbon content is 0.02 ~ 0.05, and yield tensile ratio is not more than 0.80, uniform elongation >=10%, and thickness of strand is 230mm, and rolling adopts conventional two-phase control rolling; 2) the products production parameter process announced mainly obtains in laboratory simulation experiment; 4) rolling pass rate >=60% in recrystallization zone in the Product Process announced, finish rolling start rolling temperature is 880 DEG C ~ 950 DEG C, product performance yield tensile ratio is not more than 0.80, uniform elongation >=10%, all has certain defect above or in the performance of steel plate purity, steel plate or in production technique.
Summary of the invention
Goal of the invention of the present invention is for above deficiency, a kind of low temperature large sstrain X80 dual phase sheet steel that large soft reduction process is produced is provided, under the prerequisite improving situ production efficiency and reduction cost of alloy, produce and there is excellent block hammer performance, low yield tensile ratio, the X80 two-phase Pipeline Steel Plate of the over-all propertieies such as high stress ratio and uniform elongation, P content maximum value 0.010% in product composition design of the present invention, S content maximum value 0.003%, steel is purer, after technology implementation ,-20 DEG C of Charpy-V impact powers of steel plate reach more than 350J,-15 DEG C of shear area >=95% that drop hammer, uniform elongation UEL >=12, in Composition Design, adopt low niobium chromatize Composition Design simultaneously, under the prerequisite ensureing plate property, effectively save adding of expensive alloying elements molybdenum, on rolling technology, the ingenious high pressure water that utilizes is to laminar cooling process, effective crystal grain thinning and enhancing productivity, adopt super thick intermediate blank, effectively alleviate roughing mill burden, Unhydrated cement adopts low temperature large pressure multi-pass cold rolling, take into account plate property and rhythm of production, large-scale industrial production preferably.
The present invention is achieved by the following technical solutions:
The large sstrain X80 dual phase sheet steel that the large soft reduction process of low temperature is produced, it is made up of following component by weight percentage, C:0.05 ~ 0.07%, Si:0.25 ~ 0.35%, Mn:1.40 ~ 1.80%, P≤0.01%, S≤0.003%, Nb:0.01 ~ 0.04%, Ti:0.01 ~ 0.02%, Mo≤0.35%, Cu≤030%:Cr≤0.35%, Ni≤0.030%, N≤40ppm, O≤20ppm, H≤1.2ppm rest part comprises Fe and inevitable impurity.
The chemical composition of described steel plate meets: Pcm=C+Si/30+Ni/60+ (Mn+Cr+Cu)/20+Mo/15+V/10+5B≤0.20%.
In its Composition Design, the effect of each element is as follows:
C: carbon is that improving intensity main is also the most cheap element, along with the increase of carbon content, the intensity of steel increases, but the welding property of steel plate and plasticity and toughness are deteriorated simultaneously, therefore the present invention selects low-carbon (LC) Composition Design, makes steel plate have good plasticity and toughness and excellent welding property.
Mn: manganese is the effective element improving intensity and toughness, and it is weak carbide forming element, its effect in smelting is deoxidation and the impact eliminating sulphur, can also reduce austenite transformation temperature, fining ferrite grains, to raising armor plate strength and toughness useful; Simultaneously can also solution strengthening ferrite and increase the hardening capacity of steel; Under low-carbon (LC) condition, it has significant promoter action to bainite transformation; But during Mn too high levels, then hardening of steel and ductility degenerates; Mn, because of its successful, with low costly becomes one of main Addition ofelements in quality plate is produced.
Si: silicon plays the effect of reductor, has solution strengthening effect simultaneously, can also delay the formation of carbide greatly, growing up of delayed cementite, adds stabilization of austenite; But Si content is high, and steel grade easily occurs inclusion, and steel easily get rusty, in hot rolling production, iron rust is easily rolled into steel plate top layer, pot galvanize poor performance, and Si demonstrates local brittle zones when welding multithreading simultaneously hazardness.
Cu: the precipitation strength of copper is the important means of the intensity improving steel, in addition, Cu to the solidity to corrosion of steel, improve weldability, low-temperature flexibility, formability and machinability etc. and be all highly profitable; But on the other hand, easily crack when continuous casting steel billet heating or hot rolling during Cu content height, worsen surface of steel plate performance, appropriate Ni must be added to stop the generation of this crackle according to the difference of intensity rank and steel plate thickness.
Ni: nickel does not have detrimentally affect to welded heat affecting zone hardening and toughness, can make again the intensity of mother metal improve, and low-temperature flexibility is improved greatly; But it is comparatively noble element, causes the cost of steel significantly to rise, less economical; The object of adding Ni element in steel mainly stop containing Cu measure high steel billet heat or hot rolling time the tendency that cracks; According to the content of Cu, Ni content is controlled 0.7-1 times at Cu content.
Ti: the titanium adding trace is in order to the nitrogen element in fixing steel; Ti has strong precipitation strength effect in addition, the intensity of steel can be improved, also the influence had the hardness at welded heat affecting zone place in the best condition, the existence of the nitride particles of Ti can suppress the grain coarsening of welded heat affecting zone to stop steel billet the growing up of crystal grain in heating, rolling, welding process, improves the toughness of mother metal and welded heat affecting zone; Ti lower than 0.005% time, Gu N weak effect, during more than 0.03%, Gu N effect reaches capacity, superfluous Ti separately or can form carbonitride together with Nb, strengthens steel, but forms the precipitated phase of bulk sometimes, will make the toughness deteriorate of steel; When the ratio of the Ti in steel, atom N is 1:1, the most tiny and distribution disperse of TiN particle, the strongest to the refining effect of high temperature austenite crystal grain, not only can obtain excellent toughness, and the Large Heat Input Welding of more than 30KJ/cm can be realized; But too much Ti content can cause the alligatoring of the nitride of titanium, unfavorable to low-temperature flexibility; Therefore, generally by Ti Composition Control about 0.02%.
Cr: the interpolation of chromium can reduce the transformation temperature of steel grade, thinning microstructure, effectively improves intensity, can also improve steel grade oxidation-resistance and high temperature corrosion-resisting performance etc., but Cr crosses and separates out thick at most, causes the embrittlement of steel, bad to welding property, therefore Cr content be designed to≤0.30%.
Another object of the present invention is to provide the manufacture method of the large sstrain X80 Pipeline Steel Plate that the large soft reduction process of a kind of low temperature is produced, the method is on the basis of mentioned component design, by controlling slab heating temperature and heat-up time, adopt the low temperature large pressure multi-pass rolling technique of brand-new thick intermediate blank, obtain the hot rolling X80 dual phase sheet steel with good obdurability and property of resisting large deformation.
The production craft step that this invention adopts is: to get the raw materials ready → molten iron KR desulfurization process → converter smelting → CAS Argon → LF+RH duplex practice refining → sheet billet continuous casting → slab reheats → horizontal broadening → longitudinal direction is shaping → finish rolling → pre-straightening → ACC mode section cooling → aligning → stacking slow cooling → UT (Ultrasonic Testing) operation.
Smelting steel process of the present invention controls alloying element addition sequence: Nb, Ti are more valuable alloying elements, add again after vacuum-treat later stage or vacuum-treat, can greatly improve microalloy element specific absorption on the one hand, also can reduce the content of hydrogen in steel simultaneously.
The manufacture method of the large sstrain X80 dual phase sheet steel that the large soft reduction process of above-mentioned a kind of low temperature is produced, its concrete steps are:
(1) after raw material molten iron KR pre-treatment, through converter smelting, send into the refining of LF refining furnace again, then in VD stove, carry out vacuum-treat after ladle argon-blown, protect vacuum time 20 minutes, process terminates rear feeding calcium iron wire 2m/t, soft blow argon 10 minutes after line feeding;
(2) upper continuous caster cast after VD stove vacuum breaker, stacking slow cooling 48 hours after strand rolls off the production line;
(3) strand is through process furnace soaking, strand time inside furnace 4-5 hour, and tapping temperature is 1110-1130 DEG C, after coming out of the stove, carries out dephosphorize by high pressure water, removing oxidized iron sheets on surface of casting blank, and after dephosphorization, casting blank surface temperature controls at 1040 DEG C ~ 1050 DEG C;
(4) horizontal-vertical rolling mode is selected in strand rolling, first horizontal broadening is carried out with longitudinally shaping to the continuously cast bloom after dephosphorization, horizontal broadening rolling 4 passage, every time draft >=12%, accumulative draft >=40%, longitudinal formation rolling 1 passage, percentage pass reduction >=16%, longitudinal formation rolling temperature controls, at 950 DEG C ~ 1050 DEG C, to obtain intermediate blank.
(5) after longitudinal formation rolling terminates, utilize roughing mill high pressure water to carry out continuous de-scaling to intermediate blank to cool 3 passages, prevent crystal grain time of staying temperature between roughing mill and finishing mill long, grain growth, guarantee that intermediate blank temperature is returned red before each de-scaling cooling, after cooling, strand temperature controls at 880 DEG C ~ 900 DEG C, air cooling treats that temperature is to 820 DEG C of finish rolling, finish rolling adopts one-pass roller, rolling 14 passage, last 1 road is that sky crosses passage, rolling mill speed is set to 1.0m/s, roller table speed 0.5m/s after machine, finish rolling adds up percentage pass reduction >=75%, finishing temperature control is at 730 DEG C ~ 750 DEG C,
(6) in described ACC mode section cooling, section cooling target cooling rate 21 DEG C/S, target final cooling temperature less than 200 DEG C, water convexity bias :+15%; Edge part shading OS:40; DS:-40.
Water convexity refers to that water coolant uses than the water yield large in the middle region in region, edges of plate, and uses the less water yield at center, and current present convex, become water convexity, and bias refers to the water yield of edge section larger than middle portion 15%.
In above-mentioned steps (2), continuous caster casting process adopts Segment Electromagnetic Stirring and strand slighter compress technique.
In upper step (2), gained slab thickness is 250mm.
Described in above-mentioned steps (4), workpiece thickness is 120mm, to ensure the accumulative greatly draft of Unhydrated cement rolling;
The pressure of above-mentioned steps (3) and step (5) mesohigh water is 20Mp.
The invention has the beneficial effects as follows: P content maximum value 0.010% in product composition design of the present invention, S content maximum value 0.003%, steel is purer, in Composition Design, adopt low niobium chromatize Composition Design simultaneously, under the prerequisite ensureing plate property, effectively save adding of expensive alloying elements molybdenum, on rolling technology, the ingenious high pressure water that utilizes is to laminar cooling process, effective crystal grain thinning and enhancing productivity, adopt super thick intermediate blank, effectively alleviate roughing mill burden, Unhydrated cement adopts low temperature large pressure multi-pass cold rolling, take into account plate property and rhythm of production, large-scale industrial production preferably, finally obtain proeutectoid ferrite+ferrite bainite tissue, gained steel plate yield strength Rt0.5 is 480MPa ~ 560MPa, tensile strength Rm is 770MPa ~ 800MPa, yield tensile ratio Rt0.5/Rm≤0.75,-20 DEG C of Charpy-V impact power >=350J,-15 DEG C of shear area >=95% that drop hammer, uniform elongation UEL >=12, steel plate non-deformability is strong, stress ratio is Rt2.0/Rt1.0 >=1.09, Rt1.5/Rt0.5 >=1.15.
Accompanying drawing explanation
Fig. 1 is the organization chart of large sstrain X80 dual phase sheet steel of the present invention.
Embodiment
The present invention is further illustrated by following specific embodiment:
Embodiment one
The large sstrain X80 dual phase sheet steel that the large soft reduction process of low temperature of the present embodiment is produced is prepared from by the component of following mass percent: C:0.05%, Si:0.25%, Mn:1.7%, P:0.008%, S:0.002%, Cr:0.25%, Ni:0.022%, Ti:0.015%, Pcm=0.19, surplus is Fe and inevitable impurity.
The preparation method of the large sstrain X80 dual phase sheet steel of the low temperature large soft reduction process production of the present embodiment is as follows:
1) smelting technology: after raw material molten iron KR pre-treatment, through 210t top and bottom combined blown converter smelting, send into the refining of LF refining furnace after ladle argon-blown again, then in VD stove, vacuum-treat is carried out, protect vacuum time 20 minutes, process terminates rear feeding calcium iron wire 2m/t, soft blow argon 10 minutes after line feeding;
2) casting process: upper 270mm × 2100mm sectional board billet continuous casting machine cast after VD stove vacuum breaker, in casting process, casting machine adopts Segment Electromagnetic Stirring and strand slighter compress technique, stacking slow cooling 48 hours after continuously cast bloom rolls off the production line;
3) heating process: strand time inside furnace 4.5 hours, tapping temperature 1120 DEG C, carries out 1 road dephosphorize by high pressure water after coming out of the stove, removing oxidized iron sheets on surface of casting blank, casting blank surface temperature 1045 DEG C after dephosphorization.
4) rolling technology: adopt horizontal broadening, longitudinally shaping and finish rolling rolling stage by stage, horizontal broadening rolling 4 passage, 4 passages press down rate and are respectively 12.2%, 13.7%, 14.5% and 13.6%, add up draft 54%, longitudinal formation rolling 1 passage, percentage pass reduction 17%; Finish rolling start rolling temperature 820 DEG C, mill product steel plate specification is 26.4mm, and last pass adds up draft 76%.
6) after testing, the salient features of this example is as follows: Rt0.5 is 520MPa, tensile strength Rm is 780MPa, yield tensile ratio Rt0.5/Rm=0.67 ,-20 DEG C of Charpy-V impact powers are 356J, 380J, 387J;-15 DEG C of shear area=95% that drop hammer, 100%; Uniform elongation UEL=12.5, Rt2.0/Rt1.0=1.10, Rt1.5/Rt0.5=1.21.
Embodiment two
The large sstrain X80 dual phase sheet steel that the large soft reduction process of low temperature of embodiment is produced is prepared from by the component of following mass percent: C:0.065%, Si:0.23%, Mn:1.70%, P:0.010%, S:0.001%, Cr:0.22%, Ni:0.022%, Ti:0.015%, Pcm=0.18, surplus is Fe and inevitable impurity.
The preparation method of the large sstrain X80 dual phase sheet steel of the large soft reduction process production of low temperature of the present embodiment is with embodiment one, difference is that strand time inside furnace is 4 hours, casting blank surface temperature 1048 DEG C after dephosphorization, horizontal broadening rolling 4 passage, 4 passages press down rate and are respectively 12.8%, 13.8%, 13.9% and 13.4%, accumulative draft 53.9%, longitudinal formation rolling 1 passage, percentage pass reduction 17.7%, it is 77% that finish rolling adds up deformation rate.
After testing, the salient features of this example is as follows: Rt0.5 is 510MPa, tensile strength Rm is 770MPa, yield tensile ratio Rt0.5/Rm=0.66, and-20 DEG C of Charpy-V impact powers are 348J, 385J, 365J;-15 DEG C of shear area=100% that drop hammer, 100%; Uniform elongation UEL=13.5, Rt2.0/Rt1.0=1.12, Rt1.5/Rt0.5=1.19.
Claims (5)
1. the large sstrain X80 dual phase sheet steel of the large soft reduction process production of low temperature, it is made up of following component by weight percentage: C:0.05 ~ 0.07%, Si:0.25 ~ 0.35%, Mn:1.40 ~ 1.80%, P≤0.01%, S≤0.003%, Nb:0.01 ~ 0.04%, Ti:0.01 ~ 0.02%, Mo≤0.35%, Cu≤030%:Cr≤0.35%, Ni≤0.030%, rest part is Fe and inevitable impurity;
The chemical composition of described steel plate meets: Pcm=C+Si/30+Ni/60+ (Mn+Cr+Cu)/20+Mo/15+V/10+5B≤0.20%;
The manufacture method of the large sstrain X80 dual phase sheet steel that the large soft reduction process of described low temperature is produced, its processing step comprises: to get the raw materials ready → molten iron KR desulfurization process → converter smelting → CAS Argon → LF+RH duplex practice refining → sheet billet continuous casting → strand reheats → horizontal broadening → longitudinal direction is shaping → finish rolling → pre-straightening → ACC mode section cooling → aligning → stacking slow cooling → UT (Ultrasonic Testing) operation;
Its concrete steps are: after (1) raw material molten iron KR pre-treatment, through converter smelting, send into the refining of LF refining furnace after ladle argon-blown again, then in VD stove, vacuum-treat is carried out, protect vacuum time 20 minutes, process terminates rear feeding calcium iron wire 2m/t, soft blow argon 10 minutes after line feeding; (2) upper continuous caster cast after VD stove evacuation, stacking slow cooling 48 hours after strand rolls off the production line; (3) strand is through process furnace soaking, strand time inside furnace 4-5 hour, and tapping temperature is 1110-1130 DEG C, after coming out of the stove, carries out dephosphorize by high pressure water, removing oxidized iron sheets on surface of casting blank, and after dephosphorization, casting blank surface temperature controls at 1040 DEG C ~ 1050 DEG C; (4) horizontal-vertical rolling mode is selected in strand rolling, first horizontal broadening is carried out with longitudinally shaping to the continuously cast bloom after dephosphorization, horizontal broadening rolling 4 passage, every time draft >=12%, accumulative draft >=40%, longitudinal formation rolling 1 passage, percentage pass reduction >=16%, longitudinal formation rolling temperature controls, at 950 DEG C ~ 1050 DEG C, to obtain intermediate blank; (5) after longitudinal formation rolling terminates, utilize roughing mill high pressure water to carry out continuous de-scaling to intermediate blank to cool 3 passages, guarantee that intermediate blank temperature is returned red before each de-scaling cooling, after cooling, strand temperature controls at 880 DEG C ~ 900 DEG C, air cooling treats that temperature is to 820 DEG C of finish rolling, finish rolling adopts one-pass roller, rolling 14 passage, last 1 road is that sky crosses passage, rolling mill speed is set to 1.0m/s, roller table speed 0.5m/s after machine, finish rolling adds up percentage pass reduction >=75%, and finishing temperature control is at 730 DEG C ~ 750 DEG C; (6) in ACC mode section cooling, section cooling target cooling rate 21 DEG C/S, target final cooling temperature less than 200 DEG C, water convexity bias :+15%; Edge part shading OS:40; DS:-40.
2. the large sstrain X80 dual phase sheet steel of the large soft reduction process production of a kind of low temperature according to claim 1, is characterized in that: in described step 2, continuous caster casting process adopts Segment Electromagnetic Stirring and strand slighter compress technique.
3. the large sstrain X80 dual phase sheet steel of the large soft reduction process production of a kind of low temperature according to claim 1, is characterized in that: in step 2, gained slab thickness is 250mm.
4. the large sstrain X80 dual phase sheet steel of the large soft reduction process production of a kind of low temperature according to claim 1, is characterized in that: workpiece thickness described in step 4 is 120mm.
5. the large sstrain X80 dual phase sheet steel of the large soft reduction process production of a kind of low temperature according to claim 1, is characterized in that: the pressure of described step 3 and step 5 mesohigh water is 20MP.
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| CN105088096B (en) * | 2015-08-31 | 2017-04-19 | 山东钢铁股份有限公司 | X80 pipeline steel with high stress ratio and high arrest toughness and preparation method and application of X80 pipeline steel |
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| CN110964971A (en) * | 2019-12-25 | 2020-04-07 | 山东钢铁集团日照有限公司 | Production method of X65M-grade pipeline steel plate with thin specification and high crack resistance |
| CN114737133B (en) * | 2022-03-23 | 2023-10-20 | 江阴兴澄特种钢铁有限公司 | Low-yield-ratio high-toughness structural steel plate and manufacturing method thereof |
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