CN104018089A - High-strength high-toughness steel plate with yield strength 890Mpa grade and method for producing same - Google Patents
High-strength high-toughness steel plate with yield strength 890Mpa grade and method for producing same Download PDFInfo
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Abstract
The invention discloses a high-strength high-toughness steel plate with yield strength 890Mpa grade, which comprises the following chemical components by weight: 0.13-0.18% of C, 0.25%-0.40% of Si, 1.40-1.70% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.020-0.030% of Als, 0.035-0.050% of NB, 0.050-0.070% of V, 0.010-0.015% of Ti, 0.15-0.30% of Cr, 0.20-0.30% of Mo and the balance of Fe and impurity. The invention also discloses a production method of the high-strength high-toughness steel plate with yield strength 890Mpa grade. The high-strength high-toughness steel plate with yield strength 890Mpa grade has excellent mechanical property, the yield strength of the steel plate in each embodiment is greater than 930 MPa, tensile strength is 980-1010 MPa, the elongation percentage is greater than 14.0%, and the impact energy of the steel plate can reach more than 100J under the temperature of -20 DEG C.
Description
Technical field
The present invention relates to a kind of Heavy Plate Production technology, specifically, relate to a kind of yield strength 890MPa grade high-strength high-tenacity steel plate and production method thereof.
Background technology
Hi-Stren steel is widely used in all kinds of engineering machinery, and along with engineering mechanical device is towards maximization, high efficiency, lightweight development, high-strength engineering machinery is widely used in construction machinery production etc. with steel.Steel for engineering machinery need to have higher intensity, good low-temperature flexibility, good anti-fatigue performance, good cold forming capability, good welding property etc.At present, yield strength 890MPa grade high-strength high-tenacity steel plate has obtained application comparatively widely.
In the patent document of Chinese Patent Application No. " 201310083414.0 " title " a kind of high-yield strength S89OQL structure iron plate of moderate thickness and production method thereof ", the design of employing low-carbon (LC), the precious metal elements such as Cr, Ni that appropriateness is added have simultaneously been prepared yield strength 890MPa grade steel plate, but the final cooling temperature of steel plate is 450-550 ℃, final cooling temperature is on the low side, is not easy to control steel plate template.
In the patent document of Chinese Patent Application No. " 200910011958.X " title " a kind of 9OOMPa level yield strength quenched and tempered steel plate and manufacture method thereof ", by adopting low-carbon (LC) Composition Design, addition portion is divided alloying element, by TMCP, add hardening and tempering process and prepared 900MPa high-strength engineering machinery steel, but its low-temperature impact toughness is on the low side,-40 ℃ is 21J left and right, and steel plate tempering temperature is lower, is not easy to make the internal stresses release of steel plate.
In the patent document of Chinese Patent Application No. " 201210147571.9 " title " a kind of 900MPa level superhigh tenacity low alloy steel and manufacture method thereof ", adopt the design of Ultra-low carbon Super-high Manganese, by TMCP+ tempering process, prepared yield strength 900MPa grade steel plate, but facts have proved that the yield strength 890MPa and the above plate property that adopt TMCP+ tempering process to prepare are very unstable, be not suitable for large-scale industrial production.
Summary of the invention
Technical problem solved by the invention is to provide a kind of yield strength 890MPa grade high-strength high-tenacity steel plate, through actual production check, its mechanical property is excellent, the yield strength of the steel plate of each embodiment is greater than 930MPa, tensile strength is 980-1010MPa, unit elongation is greater than 14.0%, more than steel plate-20 ℃ ballistic work can reach 100J.
Technical scheme is as follows:
A kind of yield strength 890MPa grade high-strength high-tenacity steel plate, its chemical composition and content are according to weight percent meter, comprise: C0.13-0.18%, Si0.25-0.40%, Mn1.40-1.70%, P≤0.015%, S≤0.005%, Als0.020-0.030%, Nb0.035-0.050%, V0.050-0.070%, Ti0.010-0.015%, Cr0.15-0.30%, Mo0.20-0.30%, surplus is Fe and impurity.
Further, the quality percentage composition of chemical composition comprises: C0.13%, Si0.33%, Mn1.70%, P0.006%, S0.002%, Als0.024%, Nb0.048%, V0.063%, Ti0.014%, Cr0.30%, Mo0.28%, surplus is Fe and impurity.
Further, the quality percentage composition of chemical composition comprises: C0.14%, Si0.28%, Mn1.65%, P0.012%, S0.003%, Als0.027%, Nb0.040%, V0.070%, Ti0.012%, Cr0.28%, Mo0.25%, surplus is Fe and impurity.
Further, the quality percentage composition of chemical composition comprises: C0.15%, Si0.34%, Mn1.55%, P0.0015%, S0.003%, Als0.030%, Nb0.038%, V0.065%, Ti0.015%, Cr0.20%, Mo0.22%, surplus is Fe and impurity.
Further, the quality percentage composition of chemical composition comprises: C0.16%, Si0.25%, Mn1.50%, P0.008%, S0.005%, Als0.030%, Nb0.043%, V0.061%, Ti0.015%, Cr0.15%, Mo0.26%, surplus is Fe and impurity.
Further, the quality percentage composition of chemical composition comprises: C0.17%, Si0.30%, Mn1.48%, P0.005%, S0.002%, Als0.024%, Nb0.035%, V0.050%, Ti0.010%, Cr0.28%, Mo0.30%, surplus is Fe and impurity.
Further, the quality percentage composition of chemical composition comprises: C0.18%, Si0.27%, Mn1.40%, P0.004%, S0.001%, Als0.021%, Nb0.050%, V0.058%, Ti0.011%, Cr0.18%, Mo0.20%, surplus is Fe and impurity.
Another technical problem solved by the invention is to provide a kind of production method of yield strength 890MPa grade high-strength high-tenacity steel plate, based on TMCP+ modifier treatment technique, and can stably manufactured 10mm-40mm yield strength 890MPa grade high-strength high-tenacity steel plate.
Technical scheme is as follows:
A production method for yield strength 890MPa grade high-strength high-tenacity steel plate, step comprises: smelting, continuous casting, slab reheat, de-scaling, roughing, finish rolling, cooling, hot straightening, shearing, modified, sampling, check and finished product warehouse-in; It is characterized in that: slab reheats in process, reheating temperature is 1180-1220 ℃, the process of reheating comprises heating zone and soaking zone, the time that always reheats that slab reheats is 250-350 minute, during heating, slab translational speed is pressed control in 10-20 minute/centimetre of, and wherein the soaking zone time is 30-60 minute; In rough rolling process, start rolling temperature is 1160-1200 ℃, has at least 2 percentage pass reductions to be greater than 28%, 3.0 times of the thickness that the thickness of intermediate blank is finished product slab; In finishing stands, start rolling temperature is 920-950 ℃, and finishing temperature is 820-860 ℃; In process of cooling, final cooling temperature 570-600 ℃, speed of cooling 15-25 ℃/s; Modified process comprises quenches and tempering, and quenching temperature is 880-920 ℃, and Quenching Soaking Time is 10-20 minute, and tempering temperature is 600-640 ℃, and tempering insulation time is 20-30 minute; The chemical composition of finished steel plate and content are according to weight percent meter, comprise: C0.13-0.18%, Si0.25-0.40%, Mn1.40-1.70%, P≤0.015%, S≤0.005%, Als0.020-0.030%, Nb0.035-0.050%, V0.050-0.070%, Ti0.010-0.015%, Cr0.15-0.30%, Mo0.20-0.30%, surplus is Fe and impurity.
Further: in process of cooling, even in order to ensure steel plate integral head, afterbody, limit portion and plate body temperature, adopt and cover end to end and edge-masking, head shadow 0-2.0m, afterbody covers 0-2.5m, edge-masking 0-2.0m, control steel plate return red rear bulk temperature poor≤50 ℃; Finished steel plate thickness is 10mm-40mm.
Further: roughing comprises that shaping stage, broadening stage and high temperature extend the stage, and roughing high temperature extends effective rolling pass number of stage and is no more than 8 roads;
In smelting process, molten iron carries out dark desulfurization through pre-treatment, then carry out converter smelting, molten iron temperature is 1250～1350 ℃, adopts single slag technique to smelt, adopt ferrosilicoaluminum, low carbon ferromanganese and ferrosilicon deoxidation alloying, manganese recovery ratio is 95%, and aluminum steel recovery rate is 55～70%, tapping pushing off the slag, Tapping Temperature of Bof is controlled at 1620-1660 ℃, and tapping process ladle will carry out BOTTOM ARGON BLOWING operation; Molten steel carries out LF external refining after converter smelting, require after converter tapping, in ladle, liquid steel temperature is greater than 1500 ℃, this stage is to molten steel gold conjugate Si, Mn, Nb, V, Ti, Cr, Mo, guarantee alloy hit, manganese metal iron yield is 99%, ferro-niobium recovery rate is 100%, vanadium iron recovery rate is 95%, silicon increases by 0.01% ferrosilicon add-on and is not less than 25kg, chromium increases by 0.01% ferrochrome add-on and is not less than 30kg, and molybdenum increases by 0.01% molybdenum-iron add-on and is not less than 40kg, and ferrotianium added in the processing later stage; RH carries out vacuum outgas, guaranteeing stable prerequisite decline low hydrogen, oxygen, the nitrogen content of liquid steel temperature, the vacuum tightness of vacuum outgas is 0.20～0.30KPa, dark vacuum time > 15min, hydrogen≤2.5ppm, oxygen≤20ppm, nitrogen≤40ppm while requiring tapping;
In casting process, smelt successful molten steel and deliver to casting machine and carry out continuous casting, control molten steel overheat 15-50 ℃; Continuous caster is straight curved type continuous caster, uses low-carbon high-manganese steel alloy covering slag, and bits keep dry; Middle bag is used alkaline hollow particle carbon-free covering agent; Keep constant speed cast, pouring speed is controlled at 0.8-1.2m/min; Do protection cast, prevent secondary oxidation of steel and air-breathing nitrogen pick-up; Strand macroscopic examination result meets C class center segregation >=2.5 grade, middle crack≤1.5 grade, center porosity≤1.0 grade.
Compared with prior art, the technology of the present invention effect comprises:
1, outstanding advantages of the present invention is based on TMCP+ modifier treatment technique, stably manufactured 10mm-40mm yield strength 890MPa grade high-strength high-tenacity steel plate.Through actual production check, its mechanical property is excellent, and the yield strength of the steel plate of each embodiment is greater than 930MPa, and tensile strength is 980-1010MPa, and unit elongation is greater than 14.0%, more than steel plate-20 ℃ ballistic work can reach 100J.
2, ton steel profit is more than 500 yuan.
By annual, produce 2000 tons of calculating, profitable approximately 100,000 yuan of year.In addition, this product has been filled up Baogang and municipal blank, and social benefit is remarkable.
Accompanying drawing explanation
Fig. 1 is the metallograph that in the present invention, embodiment 3 rolls state;
Fig. 2 is the metallograph of embodiment 3 quenching states in the present invention;
Fig. 3 is the metallograph of embodiment 3 tempering states in the present invention.
Embodiment
The present invention is by adopting low-carbon (LC) Composition Design, and appropriateness is added and improved hardening capacity element, and optimal control TMCP technique and heat treatment quenching and tempering technique are manufactured yield strength 890MPa grade high-strength high-tenacity steel plate.
In the present invention, the production method of yield strength 890MPa grade high-strength high-tenacity steel plate is: reheat → de-scaling → roughing → finish rolling of smelting → continuous casting → slab → cooling → hot straightening → shearing → modified → sampling, check → finished product warehouse-in.
Chemical composition and the content (weight percent) of finished product yield strength 890MPa grade high-strength high-tenacity steel plate are: C0.13-0.18%, Si0.25-0.40%, Mn1.40-1.70%, P≤0.015%, S≤0.005%, Als (sour molten aluminium) 0.020-0.030%, Nb0.035-0.050%, V0.050-0.070%, Ti0.010-0.015%, Cr0.15-0.30%, Mo0.20-0.30%, surplus is Fe and inevitable impurity.
Main alloy element effect of the present invention and range specification are as follows:
C:C can significantly improve the intensity of steel as interstitial solid solution element, but toughness, plasticity, cold formability and welding property are brought greatly unfavorable.The present invention adopts low-carbon (LC) design, and the quality percentage composition of regulation C is 0.13-0.18%.
Si:Si is little on supercooled austenite impact, work, but Si content can cause matrix plasticity to decline when more mainly as solution strengthening element.The quality percentage composition of Si of the present invention is 0.25-0.40%.
Mn:Mn can improve bainitic steel hardening capacity, reduces bainite transformation temperature simultaneously and promotes structure refinement, increases C content in bainite matrix simultaneously, improves intensity.The quality percentage composition of Mn of the present invention is 1.4-1.7%.
P and S:P, S can be enriched on crystal boundary as harmful element, destroy steel plate low-temperature impact toughness, therefore as far as possible low.The quality percentage composition that the quality percentage composition of regulation P of the present invention is not more than 0.015%, S is not more than 0.005%.
Al:Al adds in steel as deoxidant element on the one hand, and Al is combined with N and is formed AlN, crystal grain thinning on the other hand.The quality percentage composition of the molten Al of acid of the present invention is 0.020-0.030%.
Nb:Nb can significantly suppress austenite recrystallization, provides wider temperature window, for crystal grain thinning has been created condition for implementing the district's rolling of austenite non-recrystallization.The quality percentage composition of Nb of the present invention is 0.035-0.050%.
V:V separates out in later stage process of cooling, produces stronger precipitation strength effect.The quality percentage composition of Nb of the present invention is 0.050-0.070%.
The compound of Ti:Ti does not dissolve under up to 1400 ℃ of conditions, and in heating of plate blank process, the compound of Ti can avoid original austenite grains too to grow up by pinning crystal grain.In Plate Welding process, in heat affected zone, the compound TiN of Ti and Ti (CN) exist with the form of Second Phase Particles, and heat affected zone grain growth is had to inhibition.The quality percentage composition of Ti of the present invention is 0.010-0.015%.
Cr:Cr can promote the separated of perlite and bainite transformation curve, in, under low-carbon (LC) condition, can significantly move to right proeutectoid ferrite and perlite start transformation line, can replace the effect of part Mn and Mo.Cr coordinates the hardening capacity that can improve steel plate with Mn simultaneously, improves the mechanical property of steel plate.For reducing costs consideration, the quality percentage composition of Cr of the present invention is 0.15-0.30%.
Mo:Mo promotes that perlite is separated with bainite transformation line, and move to right significantly proeutectoid ferrite and perlite start transformation line, little on the beginning transformation line impact of bainite, is conducive to the acquisition of bainite structure, improves the hardening capacity of bainite.Add Mo, can thinning microstructure, improve toughness, promote the obdurability coupling of steel.For reducing costs consideration, the quality percentage composition of Mo of the present invention is 0.20-0.30%.
In the present invention, the step of the production method of yield strength 890MPa grade high-strength high-tenacity steel plate is specific as follows:
Step 1: smelt;
Molten iron need carry out dark desulfurization through pre-treatment, then carries out converter smelting.The total Intake Quantity of molten iron and steel scrap is 230 ± 15 tons, and wherein adding amount of scrap steel is 30～60 tons, and molten iron temperature is 1250～1350 ℃.
Adopt single slag technique to smelt, adopt ferrosilicoaluminum, low carbon ferromanganese and ferrosilicon deoxidation alloying, manganese recovery ratio calculates by 95%, and aluminum steel recovery rate is calculated by 55～70%, and tapping pushing off the slag guarantees a catch carbon success, and Tapping Temperature of Bof is controlled at 1620-1660 ℃.Tapping process ladle will carry out BOTTOM ARGON BLOWING operation.Molten steel carries out LF (ladle refining furnace) external refining after converter smelting, this operation requires after converter tapping, in ladle, liquid steel temperature is greater than 1500 ℃, this stage is joined Si to molten steel, Mn, Nb, V, Ti, Cr, the alloys such as Mo, guarantee alloy hit, manganese metal iron yield calculates by 99%, ferro-niobium recovery rate is calculated by 100%, vanadium iron recovery rate is calculated by 95%, silicon increases by 0.01% ferrosilicon add-on and is not less than 25kg, chromium increases by 0.01% ferrochrome add-on and is not less than 30kg, molybdenum increases by 0.01% molybdenum-iron add-on and is not less than 40kg, ferrotianium recovery rate is lower, and very easily oxidation, in the processing later stage, add, according to molten steel amount, ferrotianium grade is adjusted alloy addition.RH (RH refining full name is RH vacuum circulation degassing purifying method) operation is mainly carried out vacuum outgas, guaranteeing significantly to reduce the gas contents such as hydrogen, oxygen, nitrogen under the stable prerequisite of liquid steel temperature, reduce the disadvantageous effect of obnoxious flavour to Molten Steel Cleanliness, the treatment stage of RH, do not add in principle or add less alloy.The vacuum tightness of vacuum outgas is 0.20～0.30KPa, dark vacuum time > 15min, hydrogen≤2.5ppm, oxygen≤20ppm, nitrogen≤40ppm while requiring tapping.
Step 2: continuous casting;
Smelt successful molten steel and deliver to casting machine and carry out continuous casting, control molten steel overheat 15-50 ℃.Continuous caster is straight curved type continuous caster, and detailed process and parameter are controlled as follows: use low-carbon high-manganese steel alloy covering slag, bits will keep dry; Middle bag is used alkaline hollow particle carbon-free covering agent; Keep constant speed cast, pouring speed is controlled at 0.8-1.2m/min; Carry out protection cast, guard against secondary oxidation of steel and air-breathing nitrogen pick-up; Strand macroscopic examination result should meet C class center segregation >=2.5 grade, middle crack≤1.5 grade, center porosity≤1.0 grade.
Step 3: slab reheats;
When continuous casting of molten steel becomes base, temperature is cooled to be greater than 1200 ℃ from being greater than 1500 ℃, then cool to room temperature, and slab reheats and refers to that slab is elevated to and is greater than 1200 ℃ from room temperature again, the heat-processed that temperature raises again.
Slab reheats process to carry out in pusher-type furnace or walking beam furnace.The formulation that reheats temperature mainly depends on the solubleness of alloying element.Heat-processed requires suitable temperature and rational time, the abundant dissolving of promotion alloying element and composition, homogeneous microstructure.Generally, the solvent temperature of alloying element carbon (nitrogen) compound is about 1150 ℃-1200 ℃.In order to promote the abundant dissolving of alloying element carbon (nitrogen) compound, and consider on-the-spot actual production conditions, the temperature that reheats of the present invention is 1180-1220 ℃, the process of reheating comprises heating zone and soaking zone, because heating zone slab internal-external temperature difference is very large, need to finally carry out soaking even to guarantee board briquette.The time that always reheats that slab reheats is 250-350 minute, and during heating, slab translational speed is pressed control in 10-20 minute/centimetre of, and wherein the soaking zone time is 30-60 minute.
Step 4: dephosphorization;
Slab surface in reheating process can seriously generate iron scale, and therefore, slab needs to carry out de-scaling to eliminate its scale on surface after coming out of the stove.Slab adopts high-pressure water descaling, requires de-scaling pressure to be not less than 18MPa.Generally de-scaling pressure at 25MPa with interior.
Step 5: roughing;
Slab is delivered to roughing mill and is carried out roughing after de-scaling.Roughing is divided into three phases: shaping stage, broadening stage and high temperature extend the stage.The shaping stage is eliminated the defect such as uneven of steel slab surface, and promotes slab thickness even, and this stage total reduction is 10% left and right, and a minute 1-2 passage completes.The broadening stage is mainly that width of plate slab is increased to finished width, and this stage total reduction is depending on slab broadening degree, and a minute 2-4 passage completes.It is generally acknowledged, shaping stage and broadening stage can not produce obviously impact to plate property.High temperature extends the stage will give full play to mill capacity, realizes brute force and depresses greatly, with minimum road number of times, slab is rolled to workpiece thickness, and promotion austenite crystal repeatedly recrystallize, with crystal grain thinning, requires roughing high temperature to extend effective rolling pass number of stage and is no more than 8 roads.The start rolling temperature of roughing of the present invention is 1160-1200 ℃, has at least 2 percentage pass reductions to be greater than 28%, 3.0 times of the thickness that the thickness of intermediate blank is finished product slab.Rough rolling step open rolling the first passage, turn steel after the first passage must take frame de-scaling equipment to carry out de-scaling, the high temperature extension stage is carried out de-scaling flexibly depending on surface of steel plate situation, guarantees plate surface quality.
Step 6: finish rolling;
The finish rolling stage starts from intermediate blank temperature drops to austenite non-recrystallization district.Slab swings and treats temperature after rough rolling step is rolled into intermediate blank on the roller-way between roughing mill and finishing mill, and intermediate blank temperature is reduced to and is transported to finishing mill after finish rolling stage start rolling temperature scope and carries out finish rolling stage rolling.Finish rolling stage open rolling the first passage must take frame de-scaling equipment to carry out de-scaling, in the finish rolling operation of rolling, depending on surface of steel plate situation, carries out flexibly de-scaling, guarantees plate surface quality.The finish rolling stage carries out in austenite non-recrystallization district, and this stage distortion builds up, and promotes on the one hand austenite crystal " flattening ", forms a large amount of dislocations on the other hand in austenite manager, increases ferrite crystal grain nucleation site, crystal grain thinning.Require effective rolling pass number of finish rolling stage to be no more than 7 roads.The effect of Nb element has significantly suppressed austenite crystal recrystallize, improved austenite non-recrystallization district temperature, considered that the steel plate of finished product is thicker simultaneously, too high for fear of steel billet temperature after finish to gauge, finish rolling start rolling temperature of the present invention is 920-950 ℃, and finishing temperature is 820-860 ℃.
Step 7: cooling;
The present invention adopts acceleration cooling system (ACC) to control Cooling Process for Steel Plate Based.Steel plate is after controlled rolling, austenite crystal is elongated and is " flattening ", the inner accumulation of crystal grain has a large amount of dislocations and born of the same parents' shape substructure, deformed austenite under larger cooling rate effect " excessively cold ", under larger phase driving force effect, promote cenotype in deformed austenite and grain boundaries forming core, form tiny uniform bainite structure.Cooling final cooling temperature 570-600 ℃ of the present invention, speed of cooling 15-25 ℃/s.At steel plate, carry out in accelerating cooling process, even in order to ensure steel plate integral head, afterbody, limit portion and plate body temperature, need to adopt and cover end to end and edge-masking, general head shadow 0-2.0m, afterbody covers 0-2.5m, edge-masking 0-2.0m, control steel plate return red rear bulk temperature poor≤50 ℃.
Step 8: hot straightening;
Steel plate needs to carry out hot straightening processing so that steel plate has good profile out from ACC, considers steel plates straightening difficulty and thermal straightening machine ability, and requiring steel plates straightening temperature is 400-1000 ℃.If steel plate a time can not leveling, can adopt multi-pass aligning, but be no more than in principle 3 passages, reach≤6mm/2m of steel plate roughness.The specification that steel plate after hot straightening becomes to require by shearing post-treatment.
Straightening temperature is greater than 1000 ℃, and temperature is too high, and straightener cannot be worked, because straightener cooling itself is limited in one's ability, straightener can be scorched, and after the very high aligning of temperature, steel plate also can be out of shape, and has lost the meaning of aligning.Temperature is too hard lower than 400 ℃ of steel plates, and thermal straightening machine is " rectifying motionless " limited in one's ability also.Straightening temperature mainly determines by steel plate final cooling temperature, and steel plate just starts aligning after going out ACC after about approximately 1 minute, and general straightening temperature is than the low 20-30 ℃ of cold red temperature eventually.
Step 9: thermal treatment;
Thermal treatment process is hardening and tempering process.Hardening and tempering process comprises quenching and tempering, can make steel plate have good obdurability coupling, promotes the over-all properties of steel plate.Thermal treatment process of the present invention is that quenching temperature is 880-920 ℃, and Quenching Soaking Time is 10-20 minute, and tempering temperature is 600-640 ℃, and tempering insulation time is 20-30 minute.
To steel plate sampling, the check after thermal treatment.The finished product warehouse-in, the delivery that are up to the standards.
Feature of the present invention is as follows:
(1) steel plate thickness is 10mm-40mm;
(2) steel plate is carried out to appropriate alloying, under the prerequisite that guarantees plate property, reduced cost of alloy;
(2) operation of rolling adopts powerful TMCP (Thermo Mechanical ControlProcess, thermomechanical is controlled) technique to guarantee that steel plate rolls state and is organized as low-carbon bainite;
(3) suitable hardening and tempering process, promotes that steel plate has good tough mechanical property.
Below in conjunction with embodiment, technical solution of the present invention will be further described.
Embodiment 1
The slab of the plan rolling after smelting, continuous casting is put into process furnace, and be 260 minutes heat-up time, and soaking time is 40 minutes.The quality percentage composition of the chemical composition of slab is: C0.13%, Si0.33%, Mn1.70%, P0.006%, S0.002%, Als0.024%, Nb0.048%, V0.063%, Ti0.014%, Cr0.30%, Mo0.28%, surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 10mm, detailed rolling and thermal treatment process are in Table 1, and its mechanical property is in Table 2.
Embodiment 2
The slab of the plan rolling after smelting, continuous casting is put into process furnace, and be 250 minutes heat-up time, and soaking time is 30 minutes.The quality percentage composition of the chemical composition of slab is: C0.14%, Si0.28%, Mn1.65%, P0.012%, S0.003%, Als0.027%, Nb0.040%, V0.070%, Ti0.012%, Cr0.28%, Mo0.25%, surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 16mm, detailed rolling and thermal treatment process are in Table 1, and its mechanical property is in Table 2.
Embodiment 3
The slab of the plan rolling after smelting, continuous casting is put into process furnace, and 300 minutes heat-up times, soaking time is 45 minutes.The quality percentage composition of the chemical composition of slab is: C0.15%, Si0.34%, Mn1.55%, P0.0015%, S0.003%, Als0.030%, Nb0.038%, V0.065%, Ti0.015%, Cr0.20%, Mo0.22%, surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 20mm, detailed rolling and thermal treatment process are in Table 1, and its mechanical property is in Table 2.
As shown in Figure 1, for embodiment in the present invention 3, roll the metallograph of state; As shown in Figure 2, be the metallograph of 3 quenching states of embodiment in the present invention; As shown in Figure 3, be the metallograph of the 3 tempering states of embodiment in the present invention.
From Fig. 1, see, the state tissue that rolls of steel plate is mainly bainite structure, and uniform crystal particles, tiny provides condition for steel plate obtains good comprehensive mechanical property.By Fig. 2, seen, steel plate forms martensitic stucture after quenching, and is organized into lath-shaped, and lath martensite can promote steel plate to obtain good mechanical property.By Fig. 3, seen, steel plate be tempered sorbite tissue after tempered, and crystal grain such as is at axle shape or the bulk, guarantees that steel plate has good obdurability and mates.
Embodiment 4
The slab of the plan rolling after smelting, continuous casting is put into process furnace, and 300 minutes heat-up times, soaking time is 45 minutes.The quality percentage composition of the chemical composition of slab is: C0.16%, Si0.25%, Mn1.50%, P0.008%, S0.005%, Als0.030%, Nb0.043%, V0.061%, Ti0.015%, Cr0.15%, Mo0.26%, surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 25mm, detailed rolling and thermal treatment process are in Table 1, and its mechanical property is in Table 2.
Embodiment 5
The slab of the plan rolling after smelting, continuous casting is put into process furnace, 330 minutes heat-up times, soaking time is 50 minutes, the quality percentage composition of the chemical composition of slab is: C0.17%, Si0.30%, Mn1.48%, P0.005%, S0.002%, Als0.024%, Nb0.035%, V0.050%, Ti0.010%, Cr0.28%, Mo0.30%, surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 30mm, detailed rolling and thermal treatment process are in Table 1, and its mechanical property is in Table 2.
Embodiment 6
The slab of the plan rolling after smelting, continuous casting is put into process furnace, 330 minutes heat-up times, soaking time is 50 minutes, the quality percentage composition of the chemical composition of slab is: C0.18%, Si0.27%, Mn1.40%, P0.004%, S0.001%, Als0.021%, Nb0.050%, V0.058%, Ti0.011%, Cr0.18%, Mo0.20%, surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 40mm, detailed rolling and thermal treatment process are in Table 1, and its mechanical property is in Table 2.
The processing parameter of table 1 embodiment 1～6
The mechanical property of table 2 embodiment 1～6
Claims (10)
1. a yield strength 890MPa grade high-strength high-tenacity steel plate, it is characterized in that: its chemical composition and content are according to weight percent meter, comprise: C0.13-0.18%, Si0.25-0.40%, Mn1.40-1.70%, P≤0.015%, S≤0.005%, Als0.020-0.030%, Nb0.035-0.050%, V0.050-0.070%, Ti0.010-0.015%, Cr0.15-0.30%, Mo0.20-0.30%, surplus is Fe and impurity.
2. yield strength 890MPa grade high-strength high-tenacity steel plate as claimed in claim 1, it is characterized in that, the quality percentage composition of chemical composition comprises: C0.13%, Si0.33%, Mn1.70%, P0.006%, S0.002%, Als0.024%, Nb0.048%, V0.063%, Ti0.014%, Cr0.30%, Mo0.28%, surplus is Fe and impurity.
3. yield strength 890MPa grade high-strength high-tenacity steel plate as claimed in claim 1, it is characterized in that, the quality percentage composition of chemical composition comprises: C0.14%, Si0.28%, Mn1.65%, P0.012%, S0.003%, Als0.027%, Nb0.040%, V0.070%, Ti0.012%, Cr0.28%, Mo0.25%, surplus is Fe and impurity.
4. yield strength 890MPa grade high-strength high-tenacity steel plate as claimed in claim 1, it is characterized in that, the quality percentage composition of chemical composition comprises: C0.15%, Si0.34%, Mn1.55%, P0.0015%, S0.003%, Als0.030%, Nb0.038%, V0.065%, Ti0.015%, Cr0.20%, Mo0.22%, surplus is Fe and impurity.
5. yield strength 890MPa grade high-strength high-tenacity steel plate as claimed in claim 1, it is characterized in that, the quality percentage composition of chemical composition comprises: C0.16%, Si0.25%, Mn1.50%, P0.008%, S0.005%, Als0.030%, Nb0.043%, V0.061%, Ti0.015%, Cr0.15%, Mo0.26%, surplus is Fe and impurity.
6. yield strength 890MPa grade high-strength high-tenacity steel plate as claimed in claim 1, it is characterized in that, the quality percentage composition of chemical composition comprises: C0.17%, Si0.30%, Mn1.48%, P0.005%, S0.002%, Als0.024%, Nb0.035%, V0.050%, Ti0.010%, Cr0.28%, Mo0.30%, surplus is Fe and impurity.
7. yield strength 890MPa grade high-strength high-tenacity steel plate as claimed in claim 1, it is characterized in that, the quality percentage composition of chemical composition comprises: C0.18%, Si0.27%, Mn1.40%, P0.004%, S0.001%, Als0.021%, Nb0.050%, V0.058%, Ti0.011%, Cr0.18%, Mo0.20%, surplus is Fe and impurity.
8. a production method for yield strength 890MPa grade high-strength high-tenacity steel plate, step comprises: smelting, continuous casting, slab reheat, de-scaling, roughing, finish rolling, cooling, hot straightening, shearing, modified, sampling, check and finished product warehouse-in; It is characterized in that: slab reheats in process, reheating temperature is 1180-1220 ℃, the process of reheating comprises heating zone and soaking zone, the time that always reheats that slab reheats is 250-350 minute, during heating, slab translational speed is pressed control in 10-20 minute/centimetre of, and wherein the soaking zone time is 30-60 minute; In rough rolling process, start rolling temperature is 1160-1200 ℃, has at least 2 percentage pass reductions to be greater than 28%, 3.0 times of the thickness that the thickness of intermediate blank is finished product slab; In finishing stands, start rolling temperature is 920-950 ℃, and finishing temperature is 820-860 ℃; In process of cooling, final cooling temperature 570-600 ℃, speed of cooling 15-25 ℃/s; Modified process comprises quenches and tempering, and quenching temperature is 880-920 ℃, and Quenching Soaking Time is 10-20 minute, and tempering temperature is 600-640 ℃, and tempering insulation time is 20-30 minute; The chemical composition of finished steel plate and content are according to weight percent meter, comprise: C0.13-0.18%, Si0.25-0.40%, Mn1.40-1.70%, P≤0.015%, S≤0.005%, Als0.020-0.030%, Nb0.035-0.050%, V0.050-0.070%, Ti0.010-0.015%, Cr0.15-0.30%, Mo0.20-0.30%, surplus is Fe and impurity.
9. the production method of yield strength 890MPa grade high-strength high-tenacity steel plate as claimed in claim 8, it is characterized in that: in process of cooling, even in order to ensure steel plate integral head, afterbody, limit portion and plate body temperature, adopt and cover end to end and edge-masking, head shadow 0-2.0m, afterbody covers 0-2.5m, edge-masking 0-2.0m, control steel plate return red rear bulk temperature poor≤50 ℃; Finished steel plate thickness is 10mm-40mm.
10. the production method of yield strength 890MPa grade high-strength high-tenacity steel plate as claimed in claim 8, is characterized in that:
Roughing comprises that shaping stage, broadening stage and high temperature extend the stage, and roughing high temperature extends effective rolling pass number of stage and is no more than 8 roads;
In smelting process, molten iron carries out dark desulfurization through pre-treatment, then carry out converter smelting, molten iron temperature is 1250～1350 ℃, adopts single slag technique to smelt, adopt ferrosilicoaluminum, low carbon ferromanganese and ferrosilicon deoxidation alloying, manganese recovery ratio is 95%, and aluminum steel recovery rate is 55～70%, tapping pushing off the slag, Tapping Temperature of Bof is controlled at 1620-1660 ℃, and tapping process ladle will carry out BOTTOM ARGON BLOWING operation; Molten steel carries out LF external refining after converter smelting, require after converter tapping, in ladle, liquid steel temperature is greater than 1500 ℃, this stage is to molten steel gold conjugate Si, Mn, Nb, V, Ti, Cr, Mo, guarantee alloy hit, manganese metal iron yield is 99%, ferro-niobium recovery rate is 100%, vanadium iron recovery rate is 95%, silicon increases by 0.01% ferrosilicon add-on and is not less than 25kg, chromium increases by 0.01% ferrochrome add-on and is not less than 30kg, and molybdenum increases by 0.01% molybdenum-iron add-on and is not less than 40kg, and ferrotianium added in the processing later stage; RH carries out vacuum outgas, guaranteeing stable prerequisite decline low hydrogen, oxygen, the nitrogen content of liquid steel temperature, the vacuum tightness of vacuum outgas is 0.20～0.30KPa, dark vacuum time > 15min, hydrogen≤2.5ppm, oxygen≤20ppm, nitrogen≤40ppm while requiring tapping;
In casting process, smelt successful molten steel and deliver to casting machine and carry out continuous casting, control molten steel overheat 15-50 ℃; Continuous caster is straight curved type continuous caster, uses low-carbon high-manganese steel alloy covering slag, and bits keep dry; Middle bag is used alkaline hollow particle carbon-free covering agent; Keep constant speed cast, pouring speed is controlled at 0.8-1.2m/min; Do protection cast, prevent secondary oxidation of steel and air-breathing nitrogen pick-up; Strand macroscopic examination result meets C class center segregation >=2.5 grade, middle crack≤1.5 grade, center porosity≤1.0 grade.
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