CN104018089B - 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, efficient, lightweight development, high-strength engineering machinery steel is widely used in construction machinery production etc..Steel for engineering machinery needs have higher intensity, good low-temperature flexibility, good anti-fatigue performance, good cold forming capability, good welding performance etc..At present, yield strength 890MPa grade high-strength high-tenacity steel plate has obtained relatively broad application.
In the patent document of Chinese Patent Application No. " 201310083414.0 " title " a kind of high-yield strength S89OQL structural steel cut deal and production method thereof ", employing low-carbon (LC) designs, the precious metal elements such as Cr, Ni that appropriateness is added simultaneously are prepared for yield strength 890MPa level steel plate, but the final cooling temperature of steel plate is 450-550 DEG C, 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 using low carbon component to design, add alloy part element, add hardening and tempering process by TMCP and be prepared for 900MPa high-strength engineering machinery steel, but its low-temperature impact toughness is on the low side,-40 DEG C is about 21J, and steel plate temperature is relatively low, 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 ", use the design of Ultra-low carbon Super-high Manganese, it is prepared for yield strength 900MPa level steel plate by TMCP+ tempering process, but facts have proved that yield strength 890MPa using TMCP+ tempering process to prepare and above plate property are the most 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 and check, its excellent in mechanical performance, the yield strength of the steel plate of each embodiment is more than 930MPa, tensile strength is 980-1010MPa, elongation percentage is more than 14.0%, and-20 DEG C of ballistic works of steel plate are up to more than 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 in percentage by weight, including: 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 weight/mass percentage composition of chemical composition includes: 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 weight/mass percentage composition of chemical composition includes: 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 weight/mass percentage composition of chemical composition includes: C0.15%, Si0.34%, Mn1.55%, P0.0015%, S0.003%, Als0.030%, Nb0.038%, V0.065%, Ti0.015%, Cr0.20%, Mo0.22%, and surplus is Fe and impurity.
Further, the weight/mass percentage composition of chemical composition includes: C0.16%, Si0.25%, Mn1.50%, P0.008%, S0.005%, Als0.030%, Nb0.043%, V0.061%, Ti0.015%, Cr0.15%, Mo0.26%, and surplus is Fe and impurity.
Further, the weight/mass percentage composition of chemical composition includes: C0.17%, Si0.30%, Mn1.48%, P0.005%, S0.002%, Als0.024%, Nb0.035%, V0.050%, Ti0.010%, Cr0.28%, Mo0.30%, and surplus is Fe and impurity.
Further, the weight/mass percentage composition of chemical composition includes: C0.18%, Si0.27%, Mn1.40%, P0.004%, S0.001%, Als0.021%, Nb0.050%, V0.058%, Ti0.011%, Cr0.18%, Mo0.20%, and surplus is Fe and impurity.
Another technical problem solved by the invention is to provide the production method of a kind of yield strength 890MPa grade high-strength high-tenacity steel plate, based on TMCP+ modifier treatment technique, it is possible to steady production 10mm-40mm yield strength 890MPa grade high-strength high-tenacity steel plate.
Technical scheme is as follows:
A kind of production method of yield strength 890MPa grade high-strength high-tenacity steel plate, step includes: smelting, continuous casting, slab reheating, de-scaling, roughing, finish rolling, cooling, thermal straightening, shearing, quenched, sample, check and finished product warehouse-in；It is characterized in that: during slab reheats, reheat temperature and be 1180-1220 DEG C, reheating process includes bringing-up section and soaking zone, total rethermalization time that slab reheats is 250-350 minute, during heating, slab translational speed presses 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 DEG C, and at least 2 percentage pass reductions are more than 28%, and the thickness of intermediate blank is 3.0 times of the thickness of finished product slab；In finishing stands, start rolling temperature is 920-950 DEG C, and finishing temperature is 820-860 DEG C；In cooling procedure, final cooling temperature 570-600 DEG C, rate of cooling 15-25 DEG C/s；Quenched process includes quenching and tempering, and hardening heat is 880-920 DEG C, and Quenching Soaking Time is 10-20 minute, and temperature is 600-640 DEG C, and tempering insulation time is 20-30 minute；The chemical composition of finished steel plate and content are in percentage by weight, including: 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 cooling procedure, in order to ensure steel plate integral head, afterbody, edge and plate body homogeneous temperature, use 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 DEG C；Finished steel plate thickness is 10mm-40mm.
Further: roughing includes that truing phase, broadening stage and high temperature extend the stage, roughing high temperature extends stage effective rolling pass number less than 8 roads；
In smelting process, molten iron carries out deep desulfurization through pretreatment, then carrying out converter smelting, molten iron temperature is 1250～1350 DEG C, uses single slag technique to smelt, use ferro-silico aluminium, low-carbon ferromanganese and ferrosilicon deoxidation alloying, manganese recovery ratio is 95%, and aluminum steel recovery rate is 55～70%, pushing off the slag of tapping, Tapping Temperature of Bof controls at 1620-1660 DEG C, BOTTOM ARGON BLOWING the to be carried out operation of tapping process ladle；Molten steel carries out LF external refining after converter smelting, after requiring converter tapping, in ladle, liquid steel temperature is more than 1500 DEG C, 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 addition not less than 25kg, chromium increases by 0.01% ferrochrome addition and is not less than 30kg, and molybdenum increases by 0.01% molybdenum-iron addition and adds not less than 40kg, ferrotianium phase after treatment；RH carries out vacuum outgas, ensureing that liquid steel temperature reduces hydrogen, oxygen, nitrogen content on the premise of stable, the vacuum of vacuum outgas is 0.20～0.30KPa, deep vacuum time ＞ 15min, it is desirable to hydrogen≤2.5ppm, oxygen≤20ppm, nitrogen≤40ppm during tapping；
In casting process, smelt successful molten steel and deliver to casting machine and carry out continuous casting, control molten steel overheat 15-50 DEG C；Conticaster is straight circular-arc type continuous casting machine, uses low-carbon high-manganese steel alloy covering slag, and bits keep being dried；Middle bag uses alkalescence hollow particle carbon-free covering agent；Keeping constant speed cast, poring rate controls at 0.8-1.2m/min；Do molding casting, 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 includes:
1, the outstanding advantages of the present invention is based on TMCP+ modifier treatment technique, steady production 10mm-40mm yield strength 890MPa grade high-strength high-tenacity steel plate.Through actual production and check, its excellent in mechanical performance, the yield strength of the steel plate of each embodiment is more than 930MPa, and tensile strength is 980-1010MPa, and elongation percentage is more than 14.0%, and-20 DEG C of ballistic works of steel plate are up to more than 100J.
2, ton steel profit more than 500 yuan.
2000 tons of calculating, profitable about 100,000 yuan of year is produced by annual.Additionally, this product has filled up Baogang and municipal blank, social benefit is notable.
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 state in the present invention；
Fig. 3 is the metallograph that in the present invention, embodiment 3 is tempered state.
Detailed description of the invention
The present invention is by using low carbon component to design, and appropriateness is added and improved quenching degree element, and optimal control TMCP technique and heat treatment quenching and tempering technique manufacture 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: smelting → continuous casting → slab reheating → de-scaling → roughing → finish rolling → cooling → thermal straightening → shearing → quenched → sample, check → finished product warehouse-in.
Chemical composition and the content (percentage by weight) of finished product yield strength 890MPa grade high-strength high-tenacity steel plate is: C0.13-0.18%, Si0.25-0.40%, Mn1.40-1.70%, P≤0.015%, S≤0.005%, Als (dissolved aluminum) 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 performance are brought the most unfavorable.The present invention uses low-carbon (LC) to design, it is stipulated that the weight/mass percentage composition of C is 0.13-0.18%.
Si:Si is little on overcooling austenite impact, works mainly as solution strengthening element, but base plastic can be caused when Si content is more to decline.The weight/mass percentage composition of the Si of the present invention is 0.25-0.40%.
Mn:Mn can improve bainitic steel quenching degree, reduces bainite transformation temperature simultaneously and promotes structure refinement, increases C content in bainite matrix simultaneously, improve intensity.The weight/mass percentage composition of the 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 the lowest.Present invention provide that the weight/mass percentage composition of P is not more than 0.015%, the weight/mass percentage composition of S is not more than 0.005%.
Al:Al mono-aspect adds in steel as deoxidant element, and on the other hand Al with N is combined formation AlN, crystal grain thinning.The weight/mass percentage composition of the molten Al of acid of the present invention is 0.020-0.030%.
Nb:Nb can significantly inhibit austenite recrystallization, provides wider temperature window for implementing the rolling of austenite Unhydrated cement, creates condition for crystal grain thinning.The weight/mass percentage composition of the Nb of the present invention is 0.035-0.050%.
V:V is mainly precipitation in later stage cooling procedure, produces stronger precipitation strength effect.The weight/mass percentage composition of the Nb of the present invention is 0.050-0.070%.
The compound of Ti:Ti is insoluble under the conditions of up to 1400 DEG C, and during heating of plate blank, the compound of Ti can avoid original austenite grains too to grow up with pinning crystal grain.During Plate Welding, in heat affected area, compound TiN and Ti (CN) of Ti is presented in Second Phase Particles, grows up heat affected area crystal grain and has inhibition.The weight/mass percentage composition of the Ti of the present invention is 0.010-0.015%.
Cr:Cr can promote pearlite and the separation of bainite transformation curve, in, can significantly move to right pro-eutectoid ferrite under the conditions of low-carbon (LC) and pearlite starts transformation line, the effect of part Mn and Mo can be replaced.Cr with Mn coordinates the quenching degree that can improve steel plate simultaneously, improves the mechanical property of steel plate.For reducing cost consideration, the weight/mass percentage composition of the Cr of the present invention is 0.15-0.30%.
Mo:Mo promotes that pearlite separates with bainite transformation line, significantly moves to right pro-eutectoid ferrite and pearlite starts transformation line, affects little on the beginning transformation line of bainite, and the beneficially acquisition of bainite structure improves the quenching degree of bainite.Add Mo, toughness can be improved with thinning microstructure, promote the obdurability coupling of steel.For reducing cost consideration, the weight/mass percentage composition of the 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 to carry out deep desulfurization through pretreatment, then carries out converter smelting.Molten iron and the total charge weight of steel scrap are 230 ± 15 tons, and wherein adding amount of scrap steel is 30～60 tons, and molten iron temperature is 1250～1350 DEG C.
Using single slag technique to smelt, use ferro-silico aluminium, low-carbon ferromanganese and ferrosilicon deoxidation alloying, manganese recovery ratio is calculated by 55～70% by 95% calculating, aluminum steel recovery rate, pushing off the slag of tapping, it is ensured that a catch carbon success, Tapping Temperature of Bof controls at 1620-1660 DEG C.BOTTOM ARGON BLOWING the to be carried out operation of tapping process ladle.Molten steel carries out LF (ladle refining furnace) external refining after converter smelting, after this procedure calls converter tapping, in ladle, liquid steel temperature is more than 1500 DEG C, molten steel is joined Si by this stage, Mn, Nb, V, Ti, Cr, the alloys such as Mo, guarantee alloy hit, manganese metal iron yield is by 99% calculating, ferro-niobium recovery rate is by 100% calculating, vanadium iron recovery rate is by 95% calculating, silicon increases by 0.01% ferrosilicon addition not less than 25kg, chromium increases by 0.01% ferrochrome addition not less than 30kg, molybdenum increases by 0.01% molybdenum-iron addition not less than 40kg, ferrotianium recovery rate is relatively low, and easily aoxidize, phase adds after treatment, according to molten steel amount, ferrotianium grade adjusts alloy addition.RH (RH refine full name is RH vacuum circulation degassing purifying method) operation is substantially carried out vacuum outgas, ensureing that liquid steel temperature is greatly reduced the gas contents such as hydrogen, oxygen, nitrogen on the premise of stable, reduce the harmful gas adverse effect to Molten Steel Cleanliness, be not added with in principle the processing stage of RH or add alloy less.The vacuum of vacuum outgas is 0.20～0.30KPa, deep vacuum time ＞ 15min, it is desirable to hydrogen≤2.5ppm, oxygen≤20ppm, nitrogen≤40ppm during tapping.
Step 2: continuous casting；
Smelt successful molten steel to deliver to casting machine and carry out continuous casting, control molten steel overheat 15-50 DEG C.Conticaster is that straight circular-arc type continuous casting machine, detailed process and state modulator are as follows: using low-carbon high-manganese steel alloy covering slag, bits to keep dry；Middle bag uses alkalescence hollow particle carbon-free covering agent；Keeping constant speed cast, poring rate controls at 0.8-1.2m/min；Carry out molding casting, 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 molten steel is casting continuously to form base, temperature from being cooled to more than 1200 DEG C more than 1500 DEG C, is cooled back to room temperature, and slab reheats and refers to that slab is increased to more than 1200 DEG C from room temperature again, the heating process that temperature raises again.
Slab reheats process to be carried out in pusher-type furnace or walking beam furnace.The formulation reheating temperature depends on the dissolubility of alloying element.Heating process requires suitable temperature and rational time, promotes fully dissolving and composition, even tissue of alloying element.Generally, the solution temperature of alloying element carbon (nitrogen) compound is about 1150 DEG C-1200 DEG C.In order to promote the abundant dissolving of alloying element carbon (nitrogen) compound, and consider the actual production conditions at scene, the reheating temperature of the present invention is 1180-1220 DEG C, reheating process includes bringing-up section and soaking zone, owing to bringing-up section slab internal-external temperature difference is very big, need finally to carry out soaking uniform to ensure board briquette.Total rethermalization time that slab reheats is 250-350 minute, and during heating, slab translational speed presses control in 10-20 minute/centimetre of, and wherein the soaking zone time is 30-60 minute.
Step 4: dephosphorization；
Slab can seriously generate iron scale in surface during reheating, and therefore, slab needs after coming out of the stove to carry out de-scaling to eliminate its scale on surface.Slab uses high-pressure water descaling, it is desirable to de-scaling pressure is not less than 18MPa.Generally de-scaling pressure is within 25MPa.
Step 5: roughing；
Slab is delivered to roughing mill after de-scaling and is carried out roughing.Roughing is divided into three phases: truing phase, broadening stage and high temperature extend the stage.Truing phase eliminates the defect such as uneven of steel slab surface, and promotes that slab thickness is uniform, and this stage total reduction is about 10%, and a point 1-2 passage completes.Width of plate slab is mainly increased to finished width by the broadening stage, and this stage total reduction is depending on slab broadening degree, and a point 2-4 passage completes.It is generally believed that plate property will not be produced and significantly affect by truing phase and broadening stage.High temperature extends stage mill capacity to be given full play to, it is achieved the big pressure of strength, with minimum road number of times, slab is rolled workpiece thickness, promotes that austenite crystal recrystallization repeatedly is with crystal grain thinning, it is desirable to roughing high temperature extends stage effective rolling pass number less than 8 roads.The start rolling temperature of the roughing of the present invention is 1160-1200 DEG C, and at least 2 percentage pass reductions are more than 28%, and the thickness of intermediate blank is 3.0 times of the thickness of finished product slab.Rough rolling step open rolling the first passage, turn steel after the first passage frame scale removal equipment must be taked to carry out de-scaling, high temperature extends the stage and carries out de-scaling depending on surface of steel plate situation flexibly, it is ensured that plate surface quality.
Step 6: finish rolling；
The finish rolling stage is from the beginning of intermediate blank temperature drops to after austenite Unhydrated cement.Slab carries out swing on roller-way between roughing mill and finishing mill after rough rolling step is rolled into intermediate blank and treats temperature, and intermediate blank temperature is transported to finishing mill and carries out finish rolling stage rolling after being reduced to finish rolling stage start rolling temperature scope.Finish rolling stage open rolling the first passage must take frame scale removal equipment to carry out de-scaling, carries out de-scaling flexibly depending on surface of steel plate situation, it is ensured that plate surface quality in the finish rolling operation of rolling.The finish rolling stage is carried out at austenite Unhydrated cement, and the deformation of this stage builds up, and on the one hand promotes austenite crystal " flattening ", on the other hand forms a large amount of dislocations in austenite is handled, increase ferrite crystal grain nucleation site, crystal grain thinning.Require that finish rolling stage effective rolling pass number is less than 7 roads.The effect of Nb element significantly suppress austenite crystal recrystallization, improve austenite Unhydrated cement temperature, the steel plate simultaneously taking account of finished product is thicker, in order to avoid after finish to gauge, steel billet temperature is too high, the finish rolling start rolling temperature of the present invention is 920-950 DEG C, and finishing temperature is 820-860 DEG C.
Step 7: cooling；
The present invention uses acceleration cooling system (ACC) to be controlled Cooling Process for Steel Plate Based.Steel plate is after controlled rolling, austenite crystal is elongated in " flattening ", intra-die accumulation has a large amount of dislocation and born of the same parents' shape substructure, deformed austenite " supercool " under bigger cooling rate effect, promote cenotype under bigger phase driving force effect in deformed austenite and grain boundaries forming core, form the bainite structure of fine uniform.The final cooling temperature of the cooling of present invention 570-600 DEG C, rate of cooling 15-25 DEG C/s.In steel plate is accelerated cooling procedure, in order to ensure steel plate integral head, afterbody, edge and plate body homogeneous temperature, need to use 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 DEG C.
Step 8: thermal straightening；
Steel plate needs from ACC to carry out thermal straightening process so that steel plate has good profile the most afterwards, considers steel plates straightening difficulty and thermal straightening machine ability, it is desirable to steel plates straightening temperature is 400-1000 DEG C.If steel plate a time can not leveling, multi-pass can be used to align, but in principle less than 3 passages, steel plate unevenness reaches≤6mm/2m.The specification that steel plate after thermal straightening requires by shearing post-treatment to become.
Straightening temperature is more than 1000 DEG C, and temperature is the highest, and straightener cannot work, because straightener self cooling capacity is limited, straightener can be scorched, and after the highest aligning of temperature, steel plate also can deform, and loses the meaning of aligning.Temperature is too hard less than 400 DEG C of steel plates, thermal straightening machine " rectifying motionless " the most limited in one's ability.Straightening temperature is mainly determined by steel plate final cooling temperature, and steel plate begins to aligning after about about 1 minute after going out ACC, and general straightening temperature is lower 20-30 DEG C than cold red temperature eventually.
Step 9: heat treatment；
Technology for Heating Processing is hardening and tempering process.Hardening and tempering process comprises quenching and tempering, steel plate can be made to have good obdurability coupling, promote the combination property of steel plate.The Technology for Heating Processing of the present invention is that hardening heat is 880-920 DEG C, and Quenching Soaking Time is 10-20 minute, and temperature is 600-640 DEG C, and tempering insulation time is 20-30 minute.
Steel plate after heat treatment is sampled, checks.Check qualified finished product to put in storage, deliver.
The feature of the present invention is as follows:
(1) steel plate thickness is 10mm-40mm；
(2) steel plate is carried out the alloying of appropriateness, on the premise of ensureing plate property, reduces cost of alloy；
(2) operation of rolling uses strength TMCP (Thermo Mechanical ControlProcess, thermomechanical controls) technique to ensure 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 intending rolling after smelting, continuous casting is put into heating furnace, and heat time heating time is 260 minutes, and soaking time is 40 minutes.The weight/mass 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.Being rolled into the steel plate that thickness is 10mm, detailed rolling and Technology for Heating Processing are shown in Table 1, and its mechanical property is shown in Table 2.
Embodiment 2
The slab intending rolling after smelting, continuous casting is put into heating furnace, and heat time heating time is 250 minutes, and soaking time is 30 minutes.The weight/mass 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.Being rolled into the steel plate that thickness is 16mm, detailed rolling and Technology for Heating Processing are shown in Table 1, and its mechanical property is shown in Table 2.
Embodiment 3
The slab intending rolling after smelting, continuous casting is put into heating furnace, 300 minutes heat time heating times, and soaking time is 45 minutes.The weight/mass 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%, and surplus is Fe and inevitable impurity.Being rolled into the steel plate that thickness is 20mm, detailed rolling and Technology for Heating Processing are shown in Table 1, and its mechanical property is shown in Table 2.
As it is shown in figure 1, roll the metallograph of state for embodiment 3 in the present invention；As in figure 2 it is shown, be the metallograph of embodiment 3 quenching state in the present invention；As it is shown on figure 3, be tempered the metallograph of state for embodiment 3 in the present invention.
Seeing from Fig. 1, the state tissue that rolls of steel plate is mainly bainite structure, and crystal grain is uniform, tiny, obtains good comprehensive mechanical property for steel plate and provides condition.Being seen by Fig. 2, form martensitic structure after steel plate is quenched, be organized into lath-shaped, lath martensite can promote that steel plate obtains good mechanical property.Seen by Fig. 3, for tempered sorbite tissue after steel plate is tempered, crystal grain in etc. shaft-like or bulk, it is ensured that steel plate has good obdurability and mates.
Embodiment 4
The slab intending rolling after smelting, continuous casting is put into heating furnace, 300 minutes heat time heating times, and soaking time is 45 minutes.The weight/mass 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%, and surplus is Fe and inevitable impurity.Being rolled into the steel plate that thickness is 25mm, detailed rolling and Technology for Heating Processing are shown in Table 1, and its mechanical property is shown in Table 2.
Embodiment 5
The slab intending rolling after smelting, continuous casting is put into heating furnace, 330 minutes heat time heating times, soaking time is 50 minutes, the weight/mass 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%, and surplus is Fe and inevitable impurity.Being rolled into the steel plate that thickness is 30mm, detailed rolling and Technology for Heating Processing are shown in Table 1, and its mechanical property is shown in Table 2.
Embodiment 6
The slab intending rolling after smelting, continuous casting is put into heating furnace, 330 minutes heat time heating times, soaking time is 50 minutes, the weight/mass 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%, and surplus is Fe and inevitable impurity.Being rolled into the steel plate that thickness is 40mm, detailed rolling and Technology for Heating Processing are shown in Table 1, and its mechanical property is shown in Table 2.
The technological parameter of table 1 embodiment 1～6
The mechanical property of table 2 embodiment 1～6
Claims (9)
1. a yield strength 890MPa grade high-strength high-tenacity steel plate, it is characterised in that: its chemistry becomes
Point and content in percentage by weight, including C 0.13-0.18%, Si 0.25-0.40%, Mn
1.40-1.70%, P≤0.015%, S≤0.005%, Als 0.020-0.030%, Nb 0.035-0.050%,
V 0.050-0.070%, Ti 0.010-0.015%, Cr 0.15-0.30%, Mo 0.20-0.30%, surplus is
Fe and impurity.
2. yield strength 890MPa grade high-strength high-tenacity steel plate as claimed in claim 1, its feature exists
In, the weight/mass percentage composition of chemical composition includes: C 0.13%, Si 0.33%, Mn 1.70%, P 0.006%,
S 0.002%, Als 0.024%, Nb 0.048%, V 0.063%, Ti 0.014%, Cr 0.30%, Mo 0.28%,
Surplus is Fe and impurity.
3. yield strength 890MPa grade high-strength high-tenacity steel plate as claimed in claim 1, its feature exists
In, the weight/mass percentage composition of chemical composition includes: C 0.14%, Si 0.28%, Mn 1.65%, P 0.012%,
S 0.003%, Als 0.027%, Nb 0.040%, V 0.070%, Ti 0.012%, Cr 0.28%, Mo 0.25%,
Surplus is Fe and impurity.
4. yield strength 890MPa grade high-strength high-tenacity steel plate as claimed in claim 1, its feature exists
In, the weight/mass percentage composition of chemical composition includes: C 0.15%, Si 0.34%, Mn 1.55%, P 0.0015%,
S 0.003%, Als 0.030%, Nb 0.038%, V 0.065%, Ti 0.015%, Cr 0.20%, Mo 0.22%,
Surplus is Fe and impurity.
5. yield strength 890MPa grade high-strength high-tenacity steel plate as claimed in claim 1, its feature exists
In, the weight/mass percentage composition of chemical composition includes: C 0.16%, Si 0.25%, Mn 1.50%, P 0.008%,
S 0.005%, Als 0.030%, Nb 0.043%, V 0.061%, Ti 0.015%, Cr 0.15%, Mo 0.26%,
Surplus is Fe and impurity.
6. yield strength 890MPa grade high-strength high-tenacity steel plate as claimed in claim 1, its feature exists
In, the weight/mass percentage composition of chemical composition includes: C 0.17%, Si 0.30%, Mn 1.48%, P 0.005%,
S 0.002%, Als 0.024%, Nb 0.035%, V 0.050%, Ti 0.010%, Cr 0.28%, Mo 0.30%,
Surplus is Fe and impurity.
7. yield strength 890MPa grade high-strength high-tenacity steel plate as claimed in claim 1, its feature exists
In, the weight/mass percentage composition of chemical composition includes: C 0.18%, Si 0.27%, Mn 1.40%, P 0.004%,
S 0.001%, Als 0.021%, Nb 0.050%, V 0.058%, Ti 0.011%, Cr 0.18%, Mo 0.20%,
Surplus is Fe and impurity.
8. a production method for yield strength 890MPa grade high-strength high-tenacity steel plate, step includes:
Smelting, continuous casting, slab reheating, de-scaling, roughing, finish rolling, cooling, thermal straightening, shearing, quenched,
Sampling, inspection and finished product warehouse-in；It is characterized in that: during slab reheats, reheating temperature is
1180-1220 DEG C, reheating process includes bringing-up section and soaking zone, total rethermalization time that slab reheats
For 250-350 minute, during heating, slab translational speed pressed 10-20 minute/centimetre of control, wherein soaking zone
Time is 30-60 minute；In rough rolling process, start rolling temperature is 1160-1200 DEG C, at least 2 passage pressure
Lower rate is more than 28%, and the thickness of intermediate blank is 3.0 times of the thickness of finished product slab；In finishing stands, open
Rolling temperature and be 920-950 DEG C, finishing temperature is 820-860 DEG C；In cooling procedure, final cooling temperature
570-600 DEG C, rate of cooling 15-25 DEG C/s, in order to ensure steel plate integral head, afterbody, edge and plate
Body homogeneous temperature, uses and covers end to end and edge-masking, head shadow more than 0, less than or equal to 2.0m,
Afterbody covers more than 0, less than 2.5m, and edge-masking, more than 0, less than or equal to 2.0m, controls steel plate and returns
Red rear bulk temperature is poor≤and 50 DEG C；Quenched process includes quenching and tempering, and hardening heat is 880-920 DEG C,
Quenching Soaking Time is 10-20 minute, and temperature is 600-640 DEG C, and tempering insulation time is 20-30
Minute；Finished steel plate thickness is 10mm-40mm, and the chemical composition of finished steel plate and content are according to weight
Percentages, including: C 0.13-0.18%, Si 0.25-0.40%, Mn 1.40-1.70%, P≤0.015%,
S≤0.005%, Als 0.020-0.030%, Nb 0.035-0.050%, V 0.050-0.070%, Ti
0.010-0.015%, Cr 0.15-0.30%, Mo 0.20-0.30%, surplus is Fe and impurity.
9. the producer of yield strength 890MPa grade high-strength high-tenacity steel plate as claimed in claim 8
Method, it is characterised in that:
Roughing includes that truing phase, broadening stage and high temperature extend the stage, and it is effective that roughing high temperature extends the stage
Rolling pass number is less than 8 roads；
In smelting process, molten iron carries out deep desulfurization through pretreatment, then carries out converter smelting, molten iron temperature
Degree is 1250～1350 DEG C, uses single slag technique to smelt, uses ferro-silico aluminium, low-carbon ferromanganese and ferrosilicon deoxidation
Alloying, manganese recovery ratio is 95%, and aluminum steel recovery rate is 55～70%, pushing off the slag of tapping, converter tapping temperature
Degree controls at 1620-1660 DEG C, BOTTOM ARGON BLOWING the to be carried out operation of tapping process ladle；Molten steel is through converter smelting
After carry out LF external refining, it is desirable to after converter tapping, in ladle liquid steel temperature be more than 1500 DEG C, these rank
Section is to molten steel gold conjugate Si, Mn, Nb, V, Ti, Cr, Mo, it is ensured that alloy hit, metal
Ferromanganese recovery rate is 99%, and ferro-niobium recovery rate is 100%, and vanadium iron recovery rate is 95%, and silicon increases by 0.01%
Ferrosilicon addition is not less than 25kg, and chromium increases by 0.01% ferrochrome addition and increases by 0.01% not less than 30kg, molybdenum
Molybdenum-iron addition is not less than 40kg, and the ferrotianium phase after treatment adds；RH carries out vacuum outgas, is ensureing
Reduce hydrogen, oxygen, nitrogen content on the premise of liquid steel temperature is stable, the vacuum of vacuum outgas be 0.20～
0.30KPa, deep vacuum time ＞ 15min, it is desirable to hydrogen≤2.5ppm during tapping, oxygen≤20ppm, nitrogen≤
40ppm；
In casting process, smelt successful molten steel and deliver to casting machine and carry out continuous casting, control molten steel overheat
15-50℃；Conticaster is straight circular-arc type continuous casting machine, uses low-carbon high-manganese steel alloy covering slag, and bits keep dry
Dry；Middle bag uses alkalescence hollow particle carbon-free covering agent；Keeping constant speed cast, poring rate controls
0.8-1.2m/min；Do molding casting, prevent secondary oxidation of steel and air-breathing nitrogen pick-up；Strand macroscopic examination is tied
Fruit meets C class center segregation >=2.5 grade, middle crack≤1.5 grade, center porosity≤1.0 grade.
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