CN104404377B - A kind of high strength steel plate with excellent cold forming capability and manufacture method thereof - Google Patents
A kind of high strength steel plate with excellent cold forming capability and manufacture method thereof Download PDFInfo
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- CN104404377B CN104404377B CN201410707939.1A CN201410707939A CN104404377B CN 104404377 B CN104404377 B CN 104404377B CN 201410707939 A CN201410707939 A CN 201410707939A CN 104404377 B CN104404377 B CN 104404377B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
A kind of high strength steel plate with excellent cold forming capability of the present invention and manufacture method thereof, by molten iron converter smelting, it is heated to after temperature is 1250～1350 DEG C adding steel scrap, use single slag technique to add aluminum and carry out deoxidation alloying, tapping pushing off the slag, BOTTOM ARGON BLOWING the to be carried out operation of tapping process ladle, molten steel carries out LF external refining after converter smelting, add ferromanganese, ferro-niobium, ferrosilicon, ferrochrome and molybdenum-iron, carry out RH operation vacuum outgas afterwards and add ferrotianium, then described molten steel is delivered to casting machine and carry out continuous casting, and prepared slab is reheated, de-scaling afterwards, roughing, finish rolling, cooling, thermal straightening, heat treatment, shear, quenched, sampling, inspection, and finished product warehouse-in.The present invention is by using low carbon component to design, and appropriateness is added and improved quenching degree element, promotes steel cleanliness factor, and optimal control heat treatment quenching and tempering technique manufactures the high strength steel plate with excellent cold forming capability.
Description
Technical field
The present invention relates to cut deal technical field, specifically, relate to a kind of there is excellent cold forming capability
High strength steel plate and manufacture method thereof.
Background technology
Hi-Stren steel is widely used in all kinds of engineering machinery, along with engineering mechanical device towards maximize,
Efficient, lightweight development, high-strength engineering machinery steel is widely used in construction machinery production etc..Engineering
Steel for engineering mechanism purpose needs to have higher intensity, good low-temperature flexibility, good anti-fatigue performance, good
Cold forming capability, good welding performance etc..In particular with the development of technology, high-strength steel user is increasingly
Paying attention to the cold forming capability of steel plate, and the intensity of usual steel plate is the highest, its cold forming capability is the poorest.
Number of patent application is entitled " high-strength cold-formed hot continuous rolled steel plate and the system thereof of " 200610116562.8 "
Make method " use relatively low alloy to design, but on the one hand based on hot continuous rolling production line, it is not suitable for Wide and Thick Slab
Milling train, does not on the other hand provide steel plate situation of doubling under the conditions of without bending radius yet；
Number of patent application is entitled " a kind of high plasticity, high tenacity ultrahigh-strength steel plates of " 201110252467.1 "
And production method " by using TMCP, hardening and tempering process to be prepared for high-strength steel sheet, but cost of alloy is higher,
And do not provide steel plate situation of doubling under the conditions of without bending radius；
Number of patent application for " 201310405935.3 " entitled " one utilize heavy and medium plate mill produce high molding
The method of performance steel plate and prepared steel plate thereof " comprehensive production cost is relatively low, but thickness specification is only limited in
Within 20mm, it is impossible to meet the demand of thick steel plates.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of by using low carbon component to design, and appropriateness interpolation carries
High-hardenability element, promote steel cleanliness factor, optimal control heat treatment quenching and tempering technique manufacture have excellent cold
The high strength steel plate of processability and manufacture method thereof.
For reaching above-mentioned purpose, a kind of high strength steel plate with excellent cold forming capability of the present invention, described high-strength steel
Plate (chemical composition of middle Baogang water) chemical composition and weight percent content be: C 0.09%-0.16%, Si
0.25%-0.45%, Mn 1.10%-1.60%, P≤0.015%, S≤0.005%, Als 0.020%-0.035%,
Nb 0.030%-0.040%, Ti 0.010%-0.020%, Cr 0.10%-0.20%, Mo 0.10%-0.20%,
Surplus is Fe and impurity.
Wherein high strength steel plate is mainly prepared from by the raw material of following weight portion:
Molten iron: 185 parts；
Steel scrap: 30-60 part；
Aluminum: 0.13-0.18 part；
Ferromanganese: 2.96-4.30 part；
Ferro-niobium: 0.10-0.13 part；
Ferrosilicon: 0.70-1.26 part；
Ferrochrome: 0.42-0.84 part；
Molybdenum-iron: 0.38-1.36 part；
Ferrotianium: 0.095-0.20 part.
A kind of manufacture has the method for the high strength steel plate of excellent cold forming capability, comprises the following steps:
Smelt: by described molten iron converter smelting, be heated to adding described steel scrap after temperature is 1250～1350 DEG C,
Use single slag technique to add described aluminum and carry out deoxidation alloying, pushing off the slag of tapping, it is ensured that a catch carbon success, turn
Stove tapping temperature controls between 1620-1660 DEG C, BOTTOM ARGON BLOWING the to be carried out operation of tapping process ladle, molten steel warp
Carry out LF external refining after converter smelting, add described ferromanganese, described ferro-niobium, described ferrosilicon, described ferrochrome
With described molybdenum-iron, carrying out RH operation vacuum outgas afterwards and add described ferrotianium, the vacuum of vacuum outgas is
0.20～0.30KPa, deep vacuum time ＞ 15min, manganese metal iron yield is by 99% calculating, ferro-niobium recovery rate
Calculating by 100%, silicon increases by 0.01% ferrosilicon addition and is not less than 25kg, and chromium increases by 0.01% ferrochrome addition
Not less than 30kg, molybdenum increases by 0.01% molybdenum-iron addition and is not less than 40kg, and ferrotianium recovery rate is relatively low, and easily
Oxidation, the phase adds after treatment, adjusts alloy addition according to molten steel amount, ferrotianium grade.RH operation master
Vacuum outgas to be carried out, is ensureing that the gases such as hydrogen, oxygen, nitrogen being greatly reduced on the premise of liquid steel temperature is stablized contains
Amount, reduces the harmful gas adverse effect to Molten Steel Cleanliness, is not added with in principle or few adduction processing stage of RH
Gold；
Continuous casting: described molten steel is delivered to casting machine and carried out continuous casting, controls molten steel overheat 15-50 DEG C；Conticaster is 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 be protected
Hold dry；Middle bag uses alkalescence hollow particle carbon-free covering agent；Keeping constant speed cast, poring rate controls
0.8-1.2m/min；Carry out molding casting, guard against secondary oxidation of steel and air-breathing nitrogen pick-up；Strand macroscopic examination is tied
Fruit should meet C class center segregation >=3.0 grade, middle crack≤1.5 grade, center porosity≤1.0 grade；
Slab reheats: slab is increased to 1180-1220 DEG C DEG C；Total rethermalization time is 250-350 minute,
The soaking zone time is 30-60 minute；When molten steel is casting continuously to form base, temperature is cooled to 1200 spend from degree more than 1500 more
Being cooled back to room temperature, slab reheats and refers to that slab is increased to 1200 spend from room temperature again more, and temperature raises again
Heating process；
Slab reheats process to be carried out in pusher-type furnace or walking beam furnace.Reheat the system of temperature
Surely the dissolubility of alloying element is depended on.Heating process requires suitable temperature and rational time, promotees
Enter fully dissolving and composition, even tissue of alloying element.Generally, alloying element carbon (nitrogen) is changed
The solution temperature of thing is about 1150 DEG C-1200 DEG C.In order to promote the abundant dissolving of alloying element carbon (nitrogen) compound,
And considering on-the-spot actual production conditions, reheating process includes bringing-up section and soaking zone, due to bringing-up section plate
Base internal-external temperature difference is very big, needs finally to carry out soaking uniform with guarantee board briquette, and during heating, slab moves speed
Degree presses control in 10-20 minute/centimetre of；
De-scaling；Slab can seriously generate iron scale, therefore, after slab is come out of the stove in surface during reheating
Need to carry out de-scaling to eliminate its scale on surface；
Roughing: start rolling temperature is 1160-1200 DEG C, at least 2 percentage pass reductions are more than 20%, intermediate blank
Thickness is 4.0-2.5 times of the thickness of finished product slab；Slab is delivered to roughing mill after de-scaling and is carried out roughing.Slightly
Roll and be divided into three phases: truing phase, broadening stage and high temperature extend the stage.Truing phase eliminates slab table
The defect such as uneven in face, and promote that slab thickness is uniform.Width of plate slab is mainly increased by the broadening stage
To finished width.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, is rolled by slab with minimum road number of times
To workpiece thickness, promote that austenite crystal recrystallization repeatedly is with crystal grain thinning, it is desirable to roughing high temperature extends rank
Duan Youxiao rolling pass number is less than 8 roads.Rough rolling step open rolling the first passage, turn steel after the first passage necessary
Taking frame scale removal equipment to carry out de-scaling, the high temperature extension stage carries out de-scaling flexibly, protects depending on surface of steel plate situation
Card plate surface quality.
Finish rolling: the finish rolling stage, slab was through roughing from the beginning of intermediate blank temperature drops to after austenite Unhydrated cement
Stage rolling carries out swing on roller-way between roughing mill and finishing mill after becoming intermediate blank and treats temperature, intermediate blank temperature
Degree is transported to finishing mill after being reduced to 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 scale removal equipment to carry out de-scaling, regards surface of steel plate feelings in the finish rolling operation of rolling
Condition carries out de-scaling flexibly, it is ensured that plate surface quality, and the finish rolling stage is carried out at austenite Unhydrated cement, should
Stage deformation builds up, and on the one hand promotes austenite crystal " flattening ", on the other hand at austenite warp
Form a large amount of dislocations in reason, increase ferrite crystal grain nucleation site, crystal grain thinning.Require that the finish rolling stage is effective
Rolling pass number is less than 7 roads, and the effect of Nb element significantly suppress austenite crystal recrystallization, improves
Austenite Unhydrated cement temperature, the steel plate simultaneously taking account of finished product is thicker, in order to avoid steel plate temperature after finish to gauge
Spending height, finish rolling start rolling temperature is 890-930 DEG C, and finishing temperature is 840-860 DEG C；
Cooling: the present invention uses acceleration cooling system (ACC) to be controlled Cooling Process for Steel Plate Based, steel plate warp
After controlled rolling, austenite crystal is elongated in " flattening ", and 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, under bigger phase driving force effect
Promote cenotype in deformed austenite and grain boundaries forming core, form the bainite structure of fine uniform, the present invention
Final cooling temperature 600-640 DEG C of cooling, rate of cooling 15-20 DEG C/s.It is accelerated cooling procedure at steel plate
In, 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, controls
Steel plate return red rear bulk temperature poor≤50 DEG C；
Thermal straightening: steel plate needs from ACC to carry out thermal straightening process so that steel plate has good profile the most afterwards,
Consider 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 be not
Pingdu reaches≤6mm/2m, the specification that the 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
Limited in one's ability, straightener can be scorched, and after the highest aligning of temperature, steel plate also can deform, and loses aligning
Meaning.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
Mainly being determined by steel plate final cooling temperature, steel plate begins to aligning after about about 1 minute after going out ACC, the strongest
Straight temperature is lower 20-30 DEG C than cold red temperature eventually；
Heat treatment: Technology for Heating Processing is hardening and tempering process.Hardening and tempering process comprises quenching and tempering, can make steel plate
Having good obdurability coupling, promote the combination property of steel plate, the Technology for Heating Processing of the present invention is quenching temperature
Degree is for 860-900 DEG C, and Quenching Soaking Time is 15-25 minute, and temperature is 620-650 DEG C, and tempering is protected
The temperature time is 25-40 minute.
Carry out afterwards shearing, quenched, sample, check and finished product warehouse-in.
Carrying out deep desulfurization to sulfur content before wherein said molten iron converter smelting is less than 0.005%.
Wherein tapping process ladle carries out low Argon operation, and molten steel must not be exposed.
Wherein after converter tapping, in ladle, liquid steel temperature is more than 1500 DEG C.
Wherein said RH operation controls field trash and is not higher than 1.0 grades, and total field trash is not higher than 3.0 grades.
Wherein said slab reheats and carries out in pusher-type furnace or walking beam furnace.
Wherein said dephosphorization operation uses high-pressure water descaling, and de-scaling pressure is between 18-25MPa.
Wherein said cooling down operation step control steel plate return red rear bulk temperature poor≤50 DEG C.
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 to toughness, plasticity, cold
It is the most unfavorable that mouldability and welding performance are brought.The present invention uses low-carbon (LC) to design, it is stipulated that the percent mass of C contains
Amount is 0.09-0.16%.
Si:Si is little on overcooling austenite impact, works mainly as solution strengthening element, but Si contains
Base plastic can be caused when measuring more to decline, affect cold forming capability.The weight/mass percentage composition of the Si of the present invention
For 0.25-0.45%.
Mn:Mn can improve bainitic steel quenching degree, reduces bainite transformation temperature simultaneously and promotes that tissue is thin
Change, increase C content in bainite matrix simultaneously, improve intensity.The weight/mass percentage composition of the Mn of the present invention
For 1.10-1.60%.
P and S:P, S can be enriched on crystal boundary as harmful element, destroy steel plate low-temperature impact toughness, because of
This is 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
It 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 0.020-0.035%.
Nb:Nb can significantly inhibit austenite recrystallization, provides for implementing the rolling of austenite Unhydrated cement
Wider temperature window, creates condition for crystal grain thinning.The weight/mass percentage composition of the Nb of the present invention is
0.030-0.040%.
The compound of Ti:Ti is insoluble under the conditions of up to 1400 DEG C, the chemical combination of Ti during heating of plate blank
Thing can avoid original austenite grains too to grow up with pinning crystal grain.During Plate Welding, heat affected area
Heat affected area crystal grain, presented in Second Phase Particles, is grown up by compound TiN and Ti (C, N) of middle Ti
There is inhibition.The weight/mass percentage composition of the Ti of the present invention is 0.010-0.020%.
Cr:Cr can promote pearlite and the separation of bainite transformation curve, in, can show under the conditions of low-carbon (LC)
Work moves to right pro-eutectoid ferrite and pearlite starts transformation line, can replace the effect of part Mn and Mo.Simultaneously
Cr with Mn coordinates the quenching degree that can improve steel plate, improves the mechanical property of steel plate.For reducing cost consideration,
The weight/mass percentage composition of the Cr of the present invention is 0.10-0.20%.
Mo:Mo promotes that pearlite separates with bainite transformation line, significantly moves to right pro-eutectoid ferrite and pearl
Body of light starts transformation line, affects little on the beginning transformation line of bainite, the beneficially acquisition of bainite structure,
Improve the quenching degree of bainite.Add Mo, toughness can be improved with thinning microstructure, promote the obdurability of steel
Join.For reducing cost consideration, the weight/mass percentage composition of the Mo of the present invention is 0.10-0.20%.
The invention difference from existing technology is that the present invention achieves following technique effect:
(1) steel plate thickness that the present invention is worth is 8mm-40mm；
(2) steel plate of the present invention uses low-carbon (LC) design, it is ensured that steel plate has good welding performance and cold forming
Performance；
(3) present invention is by controlling steel inclusion, and then promotes the cold forming capability of steel plate, and steel is pure；
(4) temperature that the present invention is higher may insure that steel plate internal stress discharges completely, improves steel further
The cold forming capability of plate.
The outstanding advantages of the present invention is to control Molten Steel Cleanliness and tempering heat treatment technique by strict, significantly carries
Rise the cold forming capability of high strength steel plate.Through actual production and check, its excellent in mechanical performance, bending of steel plate
Taking intensity and be more than 700MPa, tensile strength is 790-900MPa, and elongation percentage is more than 18.0%, can be zero
Steel plate carries out under times bending radius 180 ° of doublings, and flawless produces.
Accompanying drawing explanation
Fig. 1 is the metallograph that the embodiment of the present invention 2 is tempered state；
Fig. 2 is the clod wash photo of the embodiment of the present invention 2.
Detailed description of the invention
Below in conjunction with embodiment, to the present invention, above-mentioned and other technical characteristic and advantage are made in more detail
Bright.
Embodiment 1
By 185 tons of molten iron converter smeltings, it is heated to after temperature is 1300 DEG C adding 30 tons of steel scraps, uses single slag
Technique adds 0.13 ton of aluminum and carries out deoxidation alloying, and pushing off the slag of tapping, Tapping Temperature of Bof controls at 1620-1660
Between DEG C, BOTTOM ARGON BLOWING the to be carried out operation of tapping process ladle, molten steel must not be exposed.Molten steel is after converter smelting
Carry out LF external refining, add 4.2 tons of ferromanganese, 0.13 ton of ferro-niobium, 1.24 tons of ferrosilicon, 0.84 ton of ferrochrome
With 1.36 tons of molybdenum-irons, carry out RH operation vacuum outgas afterwards and add 0.16 ton of ferrotianium, vacuum outgas true
Reciprocal of duty cycle is 0.25KPa, deep vacuum time 20min；Described molten steel is delivered to casting machine and is carried out continuous casting, controls molten steel mistake
Temperature 15-50 DEG C；Put into slab heating furnace reheats and be warmed up to 1200 DEG C (total rethermalization time is 258
Minute, the soaking zone time is 43 minutes), under 20MPa, carry out high-pressure water descaling afterwards；Carry out afterwards,
Roughing, finish rolling, cooling, thermal straightening, heat treatment, shearing, quenched, sample, check and finished product enters
Storehouse.Detailed rolling and Technology for Heating Processing are shown in Table 1, and its mechanical property is shown in Table 2.
The weight/mass percentage composition of the chemical composition of steel plate is: C 0.09%, Si 0.44%, Mn 1.58%, P
0.009%, S 0.002%, Als 0.024%, Nb 0.039%, Ti 0.017%, Cr 0.20%, Mo 0.18%,
Surplus is Fe and inevitable impurity, is rolled into the steel plate that thickness is 8mm,
Embodiment 2
By 185 tons of molten iron converter smeltings, it is heated to after temperature is 1300 DEG C adding 35 tons of steel scraps, uses single slag
Technique adds 0.15 ton of aluminum and carries out deoxidation alloying, and pushing off the slag of tapping, Tapping Temperature of Bof controls at 1620-1660
Between DEG C, BOTTOM ARGON BLOWING the to be carried out operation of tapping process ladle, molten steel must not be exposed, and molten steel is after converter smelting
Carry out LF external refining, add 4.3 tons of ferromanganese, 0.10 ton of ferro-niobium, 0.95 ton of ferrosilicon, 0.71 ton of ferrochrome
With 0.76 ton of molybdenum-iron, carry out RH operation vacuum outgas afterwards and add 0.19 ton of ferrotianium, vacuum outgas true
Reciprocal of duty cycle is 0.25KPa, deep vacuum time 20min；Described molten steel is delivered to casting machine and is carried out continuous casting, controls molten steel mistake
Temperature 15-50 DEG C；Put into slab heating furnace reheats and be warmed up to 1200 DEG C (total rethermalization time is 250
Minute, the soaking zone time is 30 minutes), under 20MPa, carry out high-pressure water descaling afterwards；Carry out afterwards,
Roughing, finish rolling, cooling, thermal straightening, heat treatment, shearing, quenched, sample, check and finished product enters
Storehouse.Detailed rolling and Technology for Heating Processing are shown in Table 1, and its mechanical property is shown in Table 2.
The weight/mass percentage composition of the chemical composition of steel plate is: C 0.12%, Si 0.34%, Mn 1.60%, P
0.012%, S 0.003%, Als 0.027%, Nb 0.030%, Ti 0.020%, Cr 0.17%, Mo 0.20%,
Surplus is Fe and inevitable impurity, is rolled into the steel plate that thickness is 14mm.
Embodiment 3
By 185 tons of molten iron converter smeltings, it is heated to after temperature is 1300 DEG C adding 40 tons of steel scraps, uses single slag
Technique adds 0.16 ton of aluminum and carries out deoxidation alloying, and pushing off the slag of tapping, Tapping Temperature of Bof controls at 1620-1660
Between DEG C, BOTTOM ARGON BLOWING the to be carried out operation of tapping process ladle, molten steel must not be exposed.Molten steel is after converter smelting
Carry out LF external refining, add 3.36 tons of ferromanganese, 0.12 ton of ferro-niobium, 0.84 ton of ferrosilicon, 0.80 ton of ferrochrome
With 0.42 ton of molybdenum-iron, carry out RH operation vacuum outgas afterwards and add 0.13 ton of ferrotianium, vacuum outgas true
Reciprocal of duty cycle is 0.25KPa, deep vacuum time 20min；Described molten steel is delivered to casting machine and is carried out continuous casting, controls molten steel mistake
Temperature 15-50 DEG C；Put into slab heating furnace reheats and be warmed up to 1200 DEG C (total rethermalization time is 289
Minute, the soaking zone time is 47 minutes), under 20MPa, carry out high-pressure water descaling afterwards；Carry out afterwards,
Roughing, finish rolling, cooling, thermal straightening, heat treatment, shearing, quenched, sample, check and finished product enters
Storehouse.Detailed rolling and Technology for Heating Processing are shown in Table 1, and its mechanical property is shown in Table 2.
The weight/mass percentage composition of the chemical composition of steel plate is: C 0.14%, Si 0.30%, Mn 1.25%, P
0.0015%, S 0.003%, Als 0.030%, Nb 0.036%, Ti 0.014%, Cr 0.19%, Mo 0.11%,
Surplus is Fe and inevitable impurity, is rolled into the steel plate that thickness is 20mm.
Embodiment 4
By 185 tons of molten iron converter smeltings, it is heated to after temperature is 1300 DEG C adding 50 tons of steel scraps, uses single slag
Technique adds 0.17 ton of aluminum and carries out deoxidation alloying, and pushing off the slag of tapping, Tapping Temperature of Bof controls at 1620-1660
Between DEG C, BOTTOM ARGON BLOWING the to be carried out operation of tapping process ladle, molten steel must not be exposed, and molten steel is after converter smelting
Carry out LF external refining, add 2.96 tons of ferromanganese, 0.13 ton of ferro-niobium, 0.92 ton of ferrosilicon, 0.42 ton of ferrochrome
With 0.76 ton of molybdenum-iron, carry out RH operation vacuum outgas afterwards and add 0.095 ton of ferrotianium, vacuum outgas
Vacuum is 0.25KPa, deep vacuum time 20min；Described molten steel is delivered to casting machine and is carried out continuous casting, controls molten steel
Degree of superheat 15-50 DEG C；Put into slab heating furnace reheats and be warmed up to 1200 DEG C (total rethermalization time is
300 minutes, the soaking zone time was 45 minutes), under 20MPa, carry out high-pressure water descaling afterwards；Laggard
Row, roughing, finish rolling, cooling, thermal straightening, heat treatment, shearing, quenched, sample, check, Yi Jicheng
Product are put in storage.Detailed rolling and Technology for Heating Processing are shown in Table 1, and its mechanical property is shown in Table 2.
The weight/mass percentage composition of the chemical composition of steel plate is: C 0.15%, Si 0.33%, Mn 1.10%, P
0.008%, S 0.005%, Als 0.035%, Nb 0.040%, Ti 0.010%, Cr 0.10%, Mo 0.20%,
Surplus is Fe and inevitable impurity, is rolled into the steel plate that thickness is 30mm.
Embodiment 5
By 185 tons of molten iron converter smeltings, it is heated to after temperature is 1300 DEG C adding 60 tons of steel scraps, uses single slag
Technique adds 0.18 ton of aluminum and carries out deoxidation alloying, and pushing off the slag of tapping, Tapping Temperature of Bof controls at 1620-1660
Between DEG C, BOTTOM ARGON BLOWING the to be carried out operation of tapping process ladle, molten steel must not be exposed, and molten steel is after converter smelting
Carry out LF external refining, add 3.23 tons of ferromanganese, 0.12 ton of ferro-niobium, 0.87 ton of ferrosilicon, 0.63 ton of ferrochrome
With 0.76 ton of molybdenum-iron, carry out RH operation vacuum outgas afterwards and add 0.13 ton of ferrotianium, vacuum outgas true
Reciprocal of duty cycle is 0.25KPa, deep vacuum time 20min；Described molten steel is delivered to casting machine and is carried out continuous casting, controls molten steel mistake
Temperature 15-50 DEG C；Put into slab heating furnace reheats and be warmed up to 1200 DEG C (total rethermalization time is 340
Minute, the soaking zone time is 55 minutes), under 20MPa, carry out high-pressure water descaling afterwards；Carry out afterwards,
Roughing, finish rolling, cooling, thermal straightening, heat treatment, shearing, quenched, sample, check and finished product enters
Storehouse.Detailed rolling and Technology for Heating Processing are shown in Table 1, and its mechanical property is shown in Table 2.
The weight/mass percentage composition of the chemical composition of steel plate is: C 0.15%, Si 0.31%, Mn 1.20%, P
0.005%, S 0.005%, Als 0.033%, Nb 0.037%, Ti 0.014%, Cr 0.15%, Mo 0.20%,
Surplus is Fe and inevitable impurity, is rolled into the steel plate that thickness is 35mm.
Embodiment 6
By 185 tons of molten iron converter smeltings, it is heated to after temperature is 1300 DEG C adding 35 tons of steel scraps, uses single slag
Technique adds 0.16 ton of aluminum and carries out deoxidation alloying, and pushing off the slag of tapping, Tapping Temperature of Bof controls at 1620-1660
Between DEG C, BOTTOM ARGON BLOWING the to be carried out operation of tapping process ladle, molten steel must not be exposed, and molten steel is after converter smelting
Carry out LF external refining, add 3.71 tons of ferromanganese, 0.10 ton of ferro-niobium, 1.04 tons of ferrosilicon, 0.55 ton of ferrochrome
With 0.46 ton of molybdenum-iron, carry out RH operation vacuum outgas afterwards and add 0.11 ton of ferrotianium, vacuum outgas true
Reciprocal of duty cycle is 0.25KPa, deep vacuum time 20min；Described molten steel is delivered to casting machine and is carried out continuous casting, controls molten steel mistake
Temperature 15-50 DEG C；Put into slab heating furnace reheats and be warmed up to 1200 DEG C (total rethermalization time is 350
Minute, the soaking zone time is 60 minutes), under 20MPa, carry out high-pressure water descaling afterwards；Carry out afterwards,
Roughing, finish rolling, cooling, thermal straightening, heat treatment, shearing, quenched, sample, check and finished product enters
Storehouse.Detailed rolling and Technology for Heating Processing are shown in Table 1, and its mechanical property is shown in Table 2.
The weight/mass percentage composition of the chemical composition of steel plate is: C 0.16%, Si 0.37%, Mn 1.38%, P
0.014%, S 0.001%, Als 0.020%, Nb 0.031%, Ti 0.011%, Cr 0.13%, Mo 0.12%,
Surplus is Fe and inevitable impurity, is rolled into the steel plate that thickness is 40mm.
During the chemical composition of light plate of the present invention uses, Baogang's Hydrochemical Composition measures.
The technological parameter of table 1 embodiment 1～6
The mechanical property of table 2 embodiment 1～6
Fig. 1 is the metallograph that the embodiment of the present invention 2 is tempered state, and as seen from the figure, steel plate is organized as back
Fire sorbite, crystal grain is uniform, tiny, and Qie500Bei city is after the match without obvious field trash, it is ensured that steel plate has good
Good cold forming capability.
Fig. 2 is the clod wash photo of the embodiment of the present invention 2, as seen from the figure, even under zero times of bending radius
Steel plate carries out 180 ° of doublings, and sample flawless produces, and shows that steel plate has good cold forming capability.
Embodiment described above is only to be described the preferred embodiment of the present invention, not to this
Bright scope is defined, on the premise of designing spirit without departing from the present invention, and those of ordinary skill in the art
The various deformation making technical scheme and improvement, all should fall into claims of the present invention and determine
Protection domain in.
Claims (9)
1. a high strength steel plate with excellent cold forming capability, it is characterized in that: described high strength steel plate chemical composition and weight percent content be: C 0.09%-0.16%, Si 0.25%-0.45%, Mn 1.10%-1.60%, P≤0.015%, S≤0.005%, Als 0.020%-0.035%, Nb 0.030%-0.040%, Ti 0.010%-0.020%, Cr 0.10%-0.20%, Mo 0.10%-0.20%, surplus is Fe and impurity；
Described high strength steel plate is mainly prepared from by the raw material of following weight portion:
Molten iron: 185 parts；
Steel scrap: 30-60 part；
Aluminum: 0.13-0.18 part；
Ferromanganese: 2.96-4.30 part；
Ferro-niobium: 0.10-0.13 part；
Ferrosilicon: 0.70-1.26 part；
Ferrochrome: 0.42-0.84 part；
Molybdenum-iron: 0.38-1.36 part；
Ferrotianium: 0.095-0.20 part；
Its preparation method comprises the following steps:
Smelt: by described molten iron converter smelting, it is heated to adding described steel scrap after temperature is 1250～1350 DEG C, use single slag technique to add described aluminum and carry out deoxidation alloying, tapping pushing off the slag, Tapping Temperature of Bof controls between 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, add described ferromanganese, described ferro-niobium, described ferrosilicon, described ferrochrome and described molybdenum-iron, carrying out RH operation vacuum outgas afterwards and add described ferrotianium, the vacuum of vacuum outgas is 0.20～0.
30kPa, deep vacuum time ＞ 15min；
Continuous casting: described molten steel is delivered to casting machine and carried out continuous casting, controls molten steel overheat 15-50 DEG C；
Slab reheats: slab is increased to 1180-1220 DEG C；Total rethermalization time is 250-350 minute, and the soaking zone time is 30-60 minute；
De-scaling；
Roughing: start rolling temperature is 1160-1200 DEG C, at least 2 percentage pass reductions are more than 20%, and the thickness of intermediate blank is 4.0-2.5 times of the thickness of finished product slab；
Finish rolling: finish rolling start rolling temperature is 890-930 DEG C, finishing temperature is 840-860 DEG C；
Cooling: the final cooling temperature of cooling 600-640 DEG C, rate of cooling 15-20 DEG C/s；
Thermal straightening: steel plate hot straightening temperature is 400-1000 DEG C；
Heat treatment: comprising quenching and tempering, hardening heat is 860-900 DEG C, and Quenching Soaking Time is 15-25 minute, and temperature is 620-650 DEG C, and tempering insulation time is 25-40 minute；
Carry out afterwards shearing, quenched, sample, check and finished product warehouse-in.
2. the method manufacturing the high strength steel plate as claimed in claim 1 with excellent cold forming capability, it is characterised in that comprise the following steps:
Smelt: by described molten iron converter smelting, it is heated to adding described steel scrap after temperature is 1250～1350 DEG C, use single slag technique to add described aluminum and carry out deoxidation alloying, tapping pushing off the slag, Tapping Temperature of Bof controls between 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, add described ferromanganese, described ferro-niobium, described ferrosilicon, described ferrochrome and described molybdenum-iron, carrying out RH operation vacuum outgas afterwards and add described ferrotianium, the vacuum of vacuum outgas is 0.20～0.
30kPa, deep vacuum time ＞ 15min；
Continuous casting: described molten steel is delivered to casting machine and carried out continuous casting, controls molten steel overheat 15-50 DEG C；
Slab reheats: slab is increased to 1180-1220 DEG C；Total rethermalization time is 250-350 minute, and the soaking zone time is 30-60 minute；
De-scaling；
Roughing: start rolling temperature is 1160-1200 DEG C, at least 2 percentage pass reductions are more than 20%, and the thickness of intermediate blank is 4.0-2.5 times of the thickness of finished product slab；
Finish rolling: finish rolling start rolling temperature is 890-930 DEG C, finishing temperature is 840-860 DEG C；
Cooling: the final cooling temperature of cooling 600-640 DEG C, rate of cooling 15-20 DEG C/s；
Thermal straightening: steel plate hot straightening temperature is 400-1000 DEG C；
Heat treatment: comprising quenching and tempering, hardening heat is 860-900 DEG C, and Quenching Soaking Time is 15-25 minute, and temperature is 620-650 DEG C, and tempering insulation time is 25-40 minute；
Carry out afterwards shearing, quenched, sample, check and finished product warehouse-in.
The manufacture method of the high strength steel plate with excellent cold forming capability the most according to claim 2, it is characterised in that: carrying out deep desulfurization to sulfur content before described molten iron converter smelting is less than 0.005%.
The manufacture method of the high strength steel plate with excellent cold forming capability the most according to claim 2, it is characterised in that: tapping process ladle carries out low Argon operation, and molten steel must not be exposed.
The manufacture method of the high strength steel plate with excellent cold forming capability the most according to claim 2, it is characterised in that: after converter tapping, in ladle, liquid steel temperature is more than 1500 DEG C.
The manufacture method of the high strength steel plate with excellent cold forming capability the most according to claim 2, it is characterised in that: described RH operation controls field trash and is not higher than 1.0 grades, and total field trash is not higher than 3.0 grades.
The manufacture method of the high strength steel plate with excellent cold forming capability the most according to claim 2, it is characterised in that: described slab reheats and carries out in pusher-type furnace or walking beam furnace.
The manufacture method of the high strength steel plate with excellent cold forming capability the most according to claim 2, it is characterised in that: described dephosphorization operation uses high-pressure water descaling, and de-scaling pressure is between 18-25MPa.
The manufacture method of the high strength steel plate with excellent cold forming capability the most according to claim 2, it is characterised in that: described cooling down operation step control steel plate return red rear bulk temperature poor≤50 DEG C.
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