CN110468349A - A kind of antidetonation high-strength weather-proof bridge steel plate Q690qENH Z35 and its production method - Google Patents
A kind of antidetonation high-strength weather-proof bridge steel plate Q690qENH Z35 and its production method Download PDFInfo
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Abstract
The invention discloses a kind of antidetonation high-strength weather-proof bridge steel plate Q690qENHZ35 and its production methods, it includes the chemical component of following mass content: C:0.05~0.12, Si:0.08~0.25, Mn:0.09~1.45, P≤0.012, S≤0.003, Als:0.015~0.050, Nb:0.025~0.040, Cr:0.50~1.0, Mo:0.25~0.80, V:0.040~0.080, Ni:0.80~1.85, Cu:0.25~0.35, Ti:0.010~0.020, B:0.0008~0.00135, other is Fe and relict element.After examining, the steel plate dense structure, properties and index are all satisfied antidetonation high-strength weather-proof bridge steel plate Q690qENHZ35 steel requirement.
Description
Technical field
The invention belongs to Wide and Thick Slab production fields, and in particular to the antidetonation to a kind of thickness in 10mm~150mm is high-intensitive
Weather-resistance bridge Q690qENHZ35 steel plate and its production method.
Background technique
Increase with country to the dynamics of investment of traffic transport industry, highway, railway network construction and across rivers, across
The engineering of the construction in bay channel is growing day by day, needs a large amount of bridge steel, and also constantly mention to the performance requirement of bridge steel
The demand of height, bridge steel plate high intensity, long-life, weldability, safety etc. is more more and more urgent, develops Q690MPa grades
Intensity rank, have both high-strength tenacity, antidetonation, atmospheric corrosion resistance, anti-lamellar tearing performance new generation of bridge steel become urgent institute
It needs.
The requirement of Q690qENHZ35 steel plate, low-welding crack-sensitive require Ceq≤0.65%, Pcm≤0.25%, antidetonation
Performance requirement yield tensile ratio≤0.85, elongation after fracture difference >=13%, weather-proof coefficient I >=6.0, -40 DEG C of KV2>=80J, it is desirable that protect
The high-strength tenacity bridge steel of the anti-lamellar tearing performance of I grade of weather resistance of detecting a flaw, protect, is the further development of bridge construction technology
Basic material is provided.
Summary of the invention
The purpose of the present invention is to provide a kind of thickness 10mm~150mm antidetonation high-strength weather-proof bridge steel plate
Q690qENHZ35。
Another object of the present invention is to provide the producers of antidetonation high-strength weather-proof bridge steel plate Q690qENHZ35 a kind of
Method.
In order to achieve the above objectives, the technical solution adopted by the present invention is that: a kind of antidetonation high-strength weather-proof bridge steel plate
Q690qENHZ3, with a thickness of 10-150mm, the chemical component (unit, wt%) comprising following mass percent: C:0.05~
0.12, Si:0.08~0.25, Mn:0.09~1.45, P≤0.012, S≤0.003, Als:0.015~0.050, Nb:0.025
~0.040, Cr:0.50~1.0, Mo:0.25~0.80, V:0.040~0.080, Ni:0.80~1.85, Cu:0.25~
0.35, Ti:0.010~0.020, B:0.0008~0.00135, other is Fe and relict element, as steel plate thickness is in 10mm
Change between~150mm, alloying component is also got higher by low；Carbon equivalent Ceq=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/
14≤0.65%, welding crack sensibility index
Pcm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B≤0.25%,
I=26.01 (Cu%)+3.88 (Ni%)+1.20 (Cr%)+1.49 (%Si)+17.28 (%P) -7.29 (%Cu)
(%Ni) -9.10 (%Ni) (%P) -33.39 (%Cu)2≥6.0。
A kind of production method of antidetonation high-strength weather-proof bridge steel plate Q690qENHZ35, includes the following steps to realize:
1) hot metal pretreatment technology: the molten iron that arrives at a station must take off preceding slag and take off rear slag, guarantee liquid slag layer thickness≤30mm, iron
Water guarantees molten iron S≤0.003% after KR stirring desulphurization, guarantees desulfurization cycle≤20min, desulfurization temperature drop≤20 DEG C；
2) smelting molten steel is cast: entering furnace molten iron S≤0.003%, P≤0.080%, molten iron temperature >=1280 DEG C, before tapping
Slag tapping before being kept off with floating plug, tapping use slag retaining cone pushing off the slag before terminating, guarantee thickness of slag layer≤28mm, in converter tapping process
It is required that whole Argon；To the degree of purity strict control of molten steel, total rank of non-metallic inclusion is controlled within 2.0 in molten steel,
And in stringent molten steel five big harmful elements content, improve corrosion resistance field trash selection control technology；
3) LF refining: using Low-phosphorus Steel LF refining technique+VD Fruit storage, controls LF refining deoxidier, alloy type
Other use obtains the pure molten steel of steel with this, reduces the gases such as harmful elements and N, H, O such as P, S, Si in molten steel, really
Protecting removes field trash in molten steel and gas adequately, while not bringing new field trash and other into
Alloying element reasonably adjusts molten steel composition in refining process, and temperature leaving from station is rationally controlled after refining, guarantee casting normally into
Row；A VD carbonization treatment is carried out before LF refining, it is ensured that for finished product carbon content in scope of design, VD determines hydrogen≤1.2ppm；
4) continuous casting: during continuous casting, being controlled using cast temperature according to 1560-1565 DEG C, and molding was cast
Cheng Zhong is quickly cooled down using water-cooled die casting ontology, achievees the effect that approximate directional solidification, and Lai Gaishan inside ingot is segregated, is loose
The defects of, and keep dense internal organization, ingredient relatively uniform, it is at high cost expensive to solve ESR ingot, and in conventional molding
Quality general problem in portion's guarantees >=3.0 times of compression ratios by continuous casting and molding two ways；
5) heating rolling: heating temperature is controlled in the operation of rolling makes steel billet uniform well-burnt not burning, slab heating time 11
± 1min/mm, 15 ± 1min/mm of ingot casting；In rolling, using two-phase control rolling, dry in the air 1.5~2.0 times of steel thickness；One stage adopted
With the big pressure rolling of high temperature low speed, into steel 1.0~2.0m/s of speed,；Austenite is quickly cooled to using ACC before two-stage open rolling
Not in crystal region temperature, so that the secondary superposition refinement of tissue crystal grain, even tissue；In the operation of rolling, using " high temperature, low speed, big
Pressure " technique and " differential temperature rolling " rolling, give full play to the big roll-force advantage of 3800mm milling train, fill deformation in thickness direction
Divide and infiltrate into center, be sufficiently crushed original as-cast structure, refine steel plate crystal grain uniformly, while further healing inside ingot is dredged
Loose defect.
It utilizes " differential temperature rolling ", i.e., it is strong using dephosphorization case or the cooling steel billet surface temperature of ACC or high pressure water, enhancing green shell
Degree forms internal temperature height, and surface temperature is low, is conducive to the infiltration of roll-force, and internal modification is big, and surface deformation is small, solves special
Existing rolling deformation is difficult to penetrate into steel plate center portion during heavy plate rolling, steel plate micro-crack is difficult to press and steel plate recrystallization
Insufficient, center portion and the big problem of surface of steel plate crystal grain gap increase center portion deformation when steel plate rolling, improve steel billet center and lack
Fall into (micro-crack, loose, shrinkage cavity) healing efficiency, improve structural homogenity, thus reduce time of staying temperature, improve rolling efficiency,
Reduce the production of secondary oxidation iron sheet.
6) prequenching is handled: for the best obdurability matching of steel plate after be tempered, ideal quenching structure is not singly
One martensitic structure；If obtaining single martensitic structure after steel plate quenching, it is opposite that original austenite grain will form lath
Coarse martensite is unfavorable for the raising of steel plate toughness.If cooled down with quenching velocity appropriate, in overcooling austenite
In austenite grain is divided into first by the Intragranular Acicular Ferrite formed at first by many fritters, be then subcooled to Bs/Ms point hereinafter,
Ferrite bainite/martensite that various different orientations are formed in divided fritter, can refine bainite/martensite plate
Beam, obtains ferrite bainite/martensite and adds ferritic line and staff control, be conducive to the raising of toughness；The temperature of prequenching processing
Degree is 920 ± 30 DEG C, and the soaking time of prequenching processing is 2.0 ± 4min/mm.
7) intercritical hardening processing and tempering: in heat treatment process, by the intercritical hardening of two-phase section, retain part not
Molten ferrite prevents the austenite changed from growing up, and since steel plate is come out of the stove to the transmission time for entering to have before water 3min, at this time
Before bainite/martensite phase transformation starts, in the transgranular Intragranular Acicular Ferrite that will form different orientation, they are a certain amount of austenite
Crystal grain be divided into multiple regions, be as cold as bainite/martensite transformation start temperature after, different orientation in divided each area
Precipitate in sub boundary promotes bainite/martensite in each sub boundary forming core, the misorientation of subgrain cause each subgrain bainite/
Martensite Shu Fangxiang is different, and the growth process of each beam bainite/martensite is limited by sub boundary；By intercritical hardening come
Control yield tensile ratio, and reach fining austenite grains and final tissue, and the ferrite in final tissue have hinder crack propagation,
The effect that yield tensile ratio improves shock resistance, the impact flexibility of the bainite/martensite of raising are reduced, and improves steel grade residual harmful
The distribution of element, after so that it is evenly distributed in refinement on the crystal boundary of crystal grain, total grain boundary area be increased significantly, unit grain boundary area
On harmful element (P, S, Sb, Sn) content it is less, effectively harmful element segregation on crystal boundary always, completes good low temperature
Impact flexibility, high-strength low-yield ratio antidetonation, anti-lamellar tearing performance are in the antidetonation high-strength weather-proof bridge steel plate of one
Q690qENHZ35；The temperature of intercritical hardening processing is 830 ± 20 DEG C, and the soaking time of intercritical hardening processing is 2.0 ± 4min/
mm；The temperature of tempering is 620 ± 50 DEG C, and the soaking time of tempering is 4 ± 1min/mm.
To guarantee steel plate welding performance, it is ensured that carbon equivalent Ceq≤0.65%, welding crack sensibility indices P cm≤
0.25%, formula is respectively Ceq=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14, Pcm=C+Si/30+Mn/20+
Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B, and guarantee I >=6.0 to improve its atmospheric corrosion resistance, wherein weather-proof
Coefficient
I=26.01 (Cu%)+3.88 (Ni%)+1.20 (Cr%)+1.49 (%Si)+17.28 (%P) -7.29 (%Cu)
(%Ni) -9.10 (%Ni) (%P) -33.39 (%Cu)2, and need to guarantee that it is preferably organized for -40 DEG C of low-temperature impact toughness,
And guarantee its shock resistance i.e. requirement of yield tensile ratio≤0.85, utilize the solution strengthening of Ni, Cr, Mo, micro alloying element Nb, V, Ti
The precipitation hardening of carbide makes original austenite grains keep refinement, and adds the harden ability that B element improves steel, to protect
Demonstrate,prove it is quenched after obtain excellent obdurability.
The present invention is using three reductions in pass after finish rolling in low P, low Si design and the operation of rolling according to the control of the road 50~80mm/
The defects of system keeps deformation fully penetrated to center in thickness direction, effective soldering and engagement ingot casting or slab internal defect, sufficiently
It is crushed original as-cast structure, refines steel plate crystal grain uniformly, while further healing inside ingot rarefaction defect, realization antidetonation,
Anti- lamellar tearing；Though P improves the atmospheric corrosion resistance of steel, keeps steel segregation serious, increase temper brittleness, and reduce steel
Plasticity, toughness are unfavorable for the subsequent welding of steel；Si can significantly improve ductile-brittle transition temperature and reduce the welding performance of steel, so
The content that Si is suitably reduced in high-strength toughness steel is suitably, to be mentioned by suitably increasing the content of Cu, Cr, Ni, Mo element
High intensity, and the weather-resistant performance of steel is improved, especially Mo element can greatly improve resistance to coastal atmospheric corrosion performance；Separately
Outside, the microalloy elements such as Nb, V, Ti are crucial toughness, intensity and solderability, and the through hardening of steel is improved by adding B
Property, the opposite content for reducing alloying element advantageously ensures that the welding performance of steel.
Detailed description of the invention
With reference to the accompanying drawings and embodiments, technical characteristic of the invention is described further.
Fig. 1 is metallographic structure of the 150mm steel plate on 1/4 section of thickness in the embodiment of the present invention.
Fig. 2 is metallographic structure of the 150mm steel plate on 1/2 section of thickness in the embodiment of the present invention.
Specific embodiment
Ingredient design: antidetonation high-strength weather-proof bridge steel plate Q460GJNHFREZ35 packet of the thickness between 10~150mm
Chemical component (unit, wt%) containing following mass percent: C:0.05~0.12, Si:0.08~0.25, Mn:0.09~
1.45, P≤0.012, S≤0.003, Als:0.015~0.050, Nb:0.025~0.040, Cr:0.50~1.0, Mo:0.25
~0.80, V:0.040~0.080, Ni:0.80~1.85, Cu:0.25~0.35, Ti:0.010~0.020, B:0.0008~
0.00135, other is Fe and relict element, and as steel plate thickness changes between 10mm~150mm, alloying component is also by low
It gets higher；
And Ceq=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14≤0.65%,
Pcm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B≤0.25%, I=26.01
(Cu%)+3.88 (Ni%)+1.20 (Cr%)+1.49 (%Si)+17.28 (%P) -7.29 (%Cu) (%Ni) -9.10 (%
Ni) (%P) -33.39 (%Cu)2≥6.0。
Carbon equivalent Ceq≤0.65% of antidetonation high-strength weather-proof bridge steel plate, low-welding crack-sensitive FACTOR P cm≤
0.25%, weather-proof coefficient I >=6.0, yield tensile ratio≤0.85, anti-lamellar tearing performance Z >=35%, elongation after fracture >=13%, -40
℃KV2≥80J。
1 10/100/150mm antidetonation high-strength weather-proof bridge steel plate Q690qENHZ35 ingredient (Wt%) of table
Produce 10~150mm of thickness antidetonation high-strength weather-proof bridge steel plate Q690qENHZ35, process flow are as follows: high-quality
Molten iron, the pretreatment of KR molten iron, 120 tons of top and bottom combined blown converters, the refining of LF furnace, Fruit storage, ingot casting heap be 24~60 hours cold,
Continuous casting billet/ingot casting heating, rolling, heap is cold, quenching+intercritical hardening+tempering, finishing, outer inspection, flaw detection, is put in storage.Specific producer
Method is as follows:
Hot metal pretreatment technology: the molten iron that arrives at a station must take off preceding slag and take off rear slag, guarantee liquid slag layer thickness≤30mm, molten iron
Guarantee molten iron S≤0.003% after KR stirring desulphurization, guarantees desulfurization cycle≤20min, desulfurization temperature drop≤20 DEG C；
It smelts casting process: entering furnace molten iron S≤0.003%, P≤0.080%, molten iron temperature >=1280 DEG C are used before tapping
Slag tapping before floating plug is kept off, tapping use slag retaining cone pushing off the slag before terminating, and guarantee thickness of slag layer≤28mm, want in converter tapping process
Journey of demanding perfection Argon.To obtain the pure molten steel of steel, the gases such as harmful elements and N, H, O such as P, S, Si in molten steel are reduced, are adopted
With Low-phosphorus Steel LF refining technique+VD Fruit storage, LF refining deoxidier, the other use of alloy type are controlled, it is ensured that refining
It removes field trash and gas in molten steel adequately, while not bringing new field trash and other alloys member into
Element reasonably adjusts molten steel composition in refining process, and temperature leaving from station is rationally controlled after refining, guarantees that casting is normally carried out.Separately
Outside, a VD carbonization treatment is carried out before LF refining, it is ensured that finished product carbon content is in scope of design.VD vacuum degree must reach 67Pa with
Under, the dwell time is necessary >=9min, coverture, and guarantee is paved with molten steel face, must shut off argon gas, upper steel temperature before adding coverture
1566±15℃.VD determines hydrogen≤1.2ppm.And guarantee >=3.0 times of compression ratios using continuous casting, molding two ways；
It during continuous casting, is controlled, is molded in casting process according to 1560-1565 DEG C using cast temperature, benefit
Be quickly cooled down with water-cooled die casting ontology, achieve the effect that approximate directional solidification, the segregation of Lai Gaishan inside ingot, it is loose the defects of,
And keeping dense internal organization, ingredient relatively uniform, solution ESR ingot is at high cost expensive, and conventional molding internal soundness one
As the problem of；
Heating temperature is controlled in the operation of rolling makes steel billet uniform well-burnt not burning, slab 11 ± 1min/mm of heating time, casting
15 ± 1min/mm of ingot.In rolling, using two-phase control rolling, dry in the air 1.5~2.0 times of steel thickness；One stage is big using high temperature low speed
Pressure rolling, into steel 1.0~2.0m/s of speed,；Austenite is quickly cooled to not in crystal region temperature using ACC before two-stage open rolling
Degree, so that the secondary superposition refinement of tissue crystal grain, even tissue.In the operation of rolling, using " high temperature, low speed, big pressure " technique and
" differential temperature rolling " rolling, gives full play to the big roll-force advantage of 3800mm milling train, keeps deformation fully penetrated into thickness direction
The heart is sufficiently crushed original as-cast structure, refines steel plate crystal grain uniformly, while further healing inside ingot rarefaction defect；
It utilizes " differential temperature rolling ", i.e., it is strong using dephosphorization case or the cooling steel billet surface temperature of ACC or high pressure water, enhancing green shell
Degree forms internal temperature height, and surface temperature is low, is conducive to the infiltration of roll-force, and internal modification is big, and surface deformation is small, solves special
Existing rolling deformation is difficult to penetrate into steel plate center portion during heavy plate rolling, steel plate micro-crack is difficult to press and steel plate recrystallization
Insufficient, center portion and the big problem of surface of steel plate crystal grain gap increase center portion deformation when steel plate rolling, improve steel billet center and lack
Fall into (micro-crack, loose, shrinkage cavity) healing efficiency, improve structural homogenity, thus reduce time of staying temperature, improve rolling efficiency,
Reduce the production of secondary oxidation iron sheet.
For the best obdurability matching of steel plate after being tempered, ideal quenching structure is not single martensite group
It knits.If obtaining single martensitic structure after steel plate quenching, original austenite grain will form the relatively coarse martensite of lath,
It is unfavorable for the raising of steel plate toughness.If cooled down with quenching velocity appropriate, by being formed at first in overcooling austenite
F austenite grain is divided into many fritters first, be then subcooled to Bs/Ms point hereinafter, in divided fritter shape
At ferrite bainite/martensite of various different orientations, bainite/martensite lath beam can be refined, obtain ferrite bainite/
Martensite adds ferritic line and staff control, is conducive to the raising of toughness.In heat treatment process, by the intercritical hardening of two-phase section,
Retaining the not molten ferrite in part prevents the austenite changed from growing up, and since steel plate is come out of the stove to entering to have~the biography of 3min before water
The defeated time, at this time before bainite/martensite phase transformation starts, in the transgranular Intragranular Acicular Ferrite that will form different orientation, their handles
A certain amount of crystal grain of austenite is divided into multiple regions, divided each after being as cold as bainite/martensite transformation start temperature
Precipitate in area in different orientation sub boundary promotes bainite/martensite in each sub boundary forming core, and the misorientation of subgrain causes
Each subgrain bainite/martensite Shu Fangxiang is different, and the growth process of each beam bainite/martensite is limited by sub boundary.
Yield tensile ratio is controlled by intercritical hardening, and reaches fining austenite grains and final tissue, and in final tissue
Ferrite play the role of hindering crack propagation, reduce yield tensile ratio and improve shock resistance, the impact of the bainite/martensite of raising is tough
Property, and the distribution of steel grade residual harmful elements is improved, and after so that it is evenly distributed in refinement on the crystal boundary of crystal grain, total crystal boundary face
Product increased significantly, and harmful element (P, S, Sb, Sn) content on unit grain boundary area is less, and effectively harmful element exists always
Segregation on crystal boundary completes favorable low-temperature impact toughness, high-strength low-yield ratio antidetonation, anti-lamellar tearing performance in the antidetonation of one
High-strength weather-proof bridge steel plate Q690qENHZ35.Prequenching processing temperature be 920 ± 30 DEG C, prequenching processing heat preservation when
Between be 2.0 ± 4min/mm.Intercritical hardening processing temperature be 830 ± 20 DEG C, intercritical hardening processing soaking time be 2.0 ±
4min/mm.The temperature of tempering is 620 ± 50 DEG C, and the soaking time of tempering is 4 ± 1min/mm.
2 antidetonation high-strength weather-proof bridge steel plate Q690qENHZ35 heat treatment process of table
Test and analyze: the mechanical property test specimen sample position of steel plate and sample preparation are according to standard GB/T 5313 and GB/T
2975 regulations carry out.Low-temperature impact toughness test by 229 standard of GB/T carry out, Erichsen test by 228 standard of GB/T into
Row, bending property test are carried out by 232 standard of GB/T.
Table 3 10,100,150mm antidetonation high-strength weather-proof bridge steel plate Q690qENHZ35 plate property
From the point of view of above data, steel plate has good low-temperature impact toughness, and plate thickness 1/4,1/2, steel plate impact flexibility
Well, anti-lamellar tearing is functional, and anti-seismic performance is good.
By above-mentioned test result as it can be seen that antidetonation high-strength weather-proof bridge steel plate Q690qENHZ35 dense structure, meets Z35
The technical requirements of rank tear-proof steel, properties and index are all satisfied antidetonation high-strength weather-proof bridge steel plate Q690qENHZ35
It is required with steel.
Outer inspection and flaw detection: examining outside the steel plate developed, and certified product rate 100%, final steel plate inspection reaches JB/T 5000.15-
The I grade of 1998 " nondestructive inspections of heavy-duty machinery general technical specifications forged steel pieces ", which is detected a flaw, to be required.
Claims (2)
1. a kind of antidetonation high-strength weather-proof bridge steel plate Q690qENHZ3, it is characterised in that: the steel plate thickness is 10-150mm, packet
Chemical component (unit, wt%) containing following mass percent: C:0.05~0.12, Si:0.08~0.25, Mn:0.09~
1.45, P≤0.012, S≤0.003, Als:0.015~0.050, Nb:0.025~0.040, Cr:0.50~1.0, Mo:0.25
~0.80, V:0.040~0.080, Ni:0.80~1.85, Cu:0.25~0.35, Ti:0.010~0.020, B:0.0008~
0.00135, other is Fe and relict element, and as steel plate thickness changes between 10mm~150mm, alloying component is also by low change
It is high；Carbon equivalent Ceq=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14≤0.65%, welding crack sensibility index
Pcm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B≤0.25%,
I=26.01 (Cu%)+3.88 (Ni%)+1.20 (Cr%)+1.49 (%Si)+17.28 (%P) -7.29 (%Cu) (%
Ni) -9.10 (%Ni) (%P) -33.39 (%Cu)2≥6.0。
2. the production method of antidetonation high-strength weather-proof bridge steel plate Q690qENHZ35 according to claim 1, feature exist
Come in including the following steps:
1) hot metal pretreatment technology: the molten iron that arrives at a station must take off preceding slag and take off rear slag, guarantee liquid slag layer thickness≤30mm, molten iron warp
Guarantee molten iron S≤0.003% after KR stirring desulphurization, guarantees desulfurization cycle≤20min, desulfurization temperature drop≤20 DEG C；
2) smelting molten steel is cast: entering furnace molten iron S≤0.003%, P≤0.080%, molten iron temperature >=1280 DEG C, preceding gear of tapping
Slag tapping before slag plug is kept off, tapping use slag retaining cone pushing off the slag before terminating, and guarantee thickness of slag layer≤28mm, require in converter tapping process
Whole Argon；To the degree of purity strict control of molten steel, total rank of non-metallic inclusion is controlled within 2.0 in molten steel, and tight
The content of five big harmful elements in lattice molten steel improves the field trash selection control technology of corrosion resistance；
3) LF refining: using Low-phosphorus Steel LF refining technique+VD Fruit storage, and control LF refining deoxidier, alloy type are other
It uses, the pure molten steel of steel is obtained with this, reduces the gases such as harmful elements and N, H, O such as P, S, Si in molten steel, it is ensured that
It removes field trash and gas in molten steel adequately, while not bringing new field trash and other alloys into
Element reasonably adjusts molten steel composition in refining process, and temperature leaving from station is rationally controlled after refining, guarantees that casting is normally carried out；
A VD carbonization treatment is carried out before LF refining, it is ensured that for finished product carbon content in scope of design, VD determines hydrogen≤1.2ppm；
4) continuous casting: during continuous casting, being controlled using cast temperature according to 1560-1565 DEG C, is molded in casting process,
It is quickly cooled down using water-cooled die casting ontology, achievees the effect that approximate directional solidification, the segregation of Lai Gaishan inside ingot, loose etc. lack
It falls into, and keeps dense internal organization, ingredient relatively uniform, solution ESR ingot is at high cost expensive, and the internal matter of conventional molding
General problem is measured, >=3.0 times of compression ratios are guaranteed by continuous casting and molding two ways；
5) heating rolling: heating temperature is controlled in the operation of rolling makes steel billet uniform well-burnt not burning, and slab heating time 11 ±
1min/mm, 15 ± 1min/mm of ingot casting；In rolling, using two-phase control rolling, dry in the air 1.5~2.0 times of steel thickness；One stage used
The big pressure rolling of high temperature low speed, into steel 1.0~2.0m/s of speed,；Austenite is quickly cooled to not using ACC before two-stage open rolling
In crystal region temperature, so that the secondary superposition refinement of tissue crystal grain, even tissue；In the operation of rolling, using " high temperature, low speed, big pressure
Under " technique and " differential temperature rolling " rolling, the big roll-force advantage of 3800mm milling train is given full play to, keeps deformation abundant in thickness direction
Center is infiltrated into, original as-cast structure is sufficiently crushed, refines steel plate crystal grain uniformly, while further healing inside ingot is loose
Defect；
6) prequenching is handled: in order to which the best obdurability of steel plate after be tempered matches, ideal quenching structure is not single
Martensitic structure；If obtaining single martensitic structure after steel plate quenching, it is relatively coarse that original austenite grain will form lath
Martensite, be unfavorable for the raising of steel plate toughness.If cooled down with quenching velocity appropriate, in overcooling austenite by
Austenite grain is divided into many fritters first by the Intragranular Acicular Ferrite formed at first, is then subcooled to Bs/Ms point hereinafter,
Ferrite bainite/martensite that various different orientations are formed in divided fritter, can refine bainite/martensite lath
Beam obtains ferrite bainite/martensite and adds ferritic line and staff control, is conducive to the raising of toughness；The temperature of prequenching processing
It is 920 ± 30 DEG C, the soaking time of prequenching processing is 2.0 ± 4min/mm；
7) in heat treatment process, by the intercritical hardening of two-phase section, it is not molten intercritical hardening processing and tempering: to retain part
Ferrite prevents the austenite that has changed from growing up, and since steel plate is come out of the stove to the transmission time for entering to have before water 3min, at this time in shellfish
Before family name's body/martensitic traoformation starts, in the transgranular Intragranular Acicular Ferrite that will form different orientation, they are a certain amount of crystalline substance of austenite
Grain is divided into multiple regions, after being as cold as bainite/martensite transformation start temperature, different orientation subgrain in divided each area
Precipitate in boundary promotes bainite/martensite in each sub boundary forming core, and the misorientation of subgrain causes each subgrain bainite/geneva
Body Shu Fangxiang is different, and the growth process of each beam bainite/martensite is limited by sub boundary；It is controlled by intercritical hardening
Yield tensile ratio, and reach fining austenite grains and final tissue, and the ferrite in final tissue has obstruction crack propagation, reduces
Yield tensile ratio improves the effect of shock resistance, the impact flexibility of the bainite/martensite of raising, and improves steel grade residual harmful elements
Distribution, make its be evenly distributed in refinement after crystal grain crystal boundary on, total grain boundary area increased significantly, on unit grain boundary area
Harmful element (P, S, Sb, Sn) content is less, effectively harmful element segregation on crystal boundary always, completes good low temperature impact
Toughness, high-strength low-yield ratio antidetonation, anti-lamellar tearing performance are in the antidetonation high-strength weather-proof bridge steel plate of one
Q690qENHZ35；The temperature of intercritical hardening processing is 830 ± 20 DEG C, and the soaking time of intercritical hardening processing is 2.0 ± 4min/
mm；The temperature of tempering is 620 ± 50 DEG C, and the soaking time of tempering is 4 ± 1min/mm.
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