CN105256095A - Smelting method of steel plate with excellent performance in large heat input welding heat affected zone - Google Patents
Smelting method of steel plate with excellent performance in large heat input welding heat affected zone Download PDFInfo
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- Heat Treatment Of Steel (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a steel plate smelting method with excellent performance in a large heat input welding heat affected zone, which sequentially comprises molten iron pretreatment, combined blown converter steelmaking, LF refining, RH vacuum refining, alloy cored wire feeding and continuous casting. The invention controls the oxygen content in the molten steel of the key station and the adding condition of key alloy materials, so that the content of Ti, O, Mg and Zr in the steel reaches the design requirement, and can meet the condition that Ti/O is more than 5 and less than 12, and (Mg + Zr)/(Ti + Al) > 0.02, so that the steel contains a large amount of one or two of Ti-Mg, Ti-Zr and Ti-Mg-Zr composite oxide inclusions with the size of less than 1 mu m, and the chemical composition mass percentage of the inclusions meets the condition that Ti is more than 2 percent and less than 40 percent, Mg is more than 2 percent and less than 30 percent, Zr is more than 2 percent and less than 30 percent, O is more than 5 percent and less than 50 percent, and the surface density is more than 300/mm2. The inclusions can effectively pin austenite grain growth of a welding heat affected zone and promote the nucleation of acicular ferrite in the crystal, thereby ensuring the excellent performance of the heat affected zone during large heat input welding.
Description
Technical field
The invention belongs to high welding performance Plate Production field, particularly the smelting process of the steel plate of a kind of high heat-input welded heat affecting zone excellent performance.
Background technology
In recent years, the steel that the fields such as shipbuilding, building, oil and gas pipeline and ocean platform use are gradually to high strength, wall thickening development, in order to improve welding efficiency, shortening production cycle, adopts the high heat-input welding efficiently such as multiple-wire submerged-arc welding, electro-gas (enclosed) welding, electroslag welding in welding procedure.From the viewpoint of guaranteeing security, requiring the weak link in welded construction---welded heat affecting zone also needs to possess enough toughness and tenacities.
But usually known, along with the increase of thermal weld stress amount, then welded heat affecting zone austenite crystal is seriously grown up, and obtains the overheated structure of coarse grains after cooling, heat affected zone plasticity and toughness is caused to decline.There are some researches show, utilize the inclusion of Dispersed precipitate in steel not only as pinning particle pinning austenite grain boundary in Thermal Cycle, Austenite Grain Growth can be suppressed, and can as forming core core, promote that Intragranular Acicular Ferrite changes, thus improve high heat-input welded heat affecting zone performance.
Based on above-mentioned theory, forefathers have carried out a large amount of research work.Add a certain amount of Ti, N as patent JP5116890, CN101586220B etc. disclose in steel, utilize TiN particle to suppress the deterioration of welding heat influence area toughness, make steel plate meet the high heat-input welding of 100kJ/cm.After this, the technology such as JP3722044, CN100523255C proposes in deposited metal or steel plate, add a certain amount of B, by B dissolving fixedly limiting TiN under high temperature to N near fusion line, heat input can be made to bring up to 200kJ/cm.
For making steel plate can adapt to more high heat-input amount welding, investigator attempts to utilize the oxide particle with better high-temperature stability as Grain boundary pinning particle and intragranular nucleation center.As the technology such as CN100523255C, CN102108467A adopt Al final deoxygenation, make to form TiO, Al in molten steel
2o
3particle, the pinning effect of these particles can at high temperature stable existence, but Al
2o
3particle is agglomeration in soft whipping process easily, loses the effect of Dispersed precipitate pinning austenite grain boundary.For this reason, Japanese Patent JP517300 controls the Al content of steel-making initial stage deoxidation, improve Ti content in steel simultaneously and improve the quantity of TiO, but there is the formation of Large Titanium inclusion equally and be difficult to Dispersed precipitate two large problems, be therefore difficult to heat affected zone toughness when ensureing the input of more than 200kJ/cm heat.
Research in recent years shows, TiO, TiN, Al
2o
3, the high-melting-point such as MnO, SiO and MnS has high surface energy mutually, the inclusion particle with multi-phase components can promote ferritic multidimensional forming core.Based on the above results, when utilizing compound type inclusions refinement high heat-input to weld, the technology of steel plate hot zone of influence crystal grain is also extensively developed, the technology that such as JP 2007-277681 announces utilizes and increases the addition of Mn in the steel containing TiO and increase ferrite transformation motivating force, TiO-MnS miscible precipitate is increased as the effect of intracrystalline phase change core, makes crystal grain miniaturization and improve heat affected zone toughness.In addition, the technology that JP 2010-77494, CN101545077B, CN101985719A, CN104404369A etc. announce utilizes the elements compounding deoxidations such as Ti, Al, Mg, Ca, Zr, control these elements and S, O content and mutual ratio thereof, some amount is formed and the composite particles of the sulfide of Dispersed precipitate and oxide compound in molten steel, these tiny densely covered particles by hindering grain boundary, suppressing austenite at high temperature to be grown up, thus significantly improve the high heat-input welding property of heat affected zone.
But also there is following problem in above technology:
1.O is as the key element of complex inclusion, the impact of smelting by molten steel alloying on station in difference is larger, the alloying of a station after too high or too low O content all can affect, and cause the inclusion particle being difficult to formation effective dimensions and sufficient amount in steel plate.And above-mentioned technology does not announce O content control method in smelting process and quantizating index.
The trace element such as 2.Ti, B, Mg, Zr acts on great in steel, but above-mentioned technology does not announce the processing parameter in steelmaking process, as alloy addition manner (comprising cored-wire size, feeding wire speed etc.), the liquid steel temperature before alloy adds, the dissolved oxygen content etc. in molten steel; Above-mentioned processing parameter directly determines steel inclusion type, size, density, distribution, and then directly determines the welding property of steel plate.
3. in the above-mentioned technology utilizing oxysulfide to be mingled with as pinning particle, S content process window is young, and it is large to smelt difficulty.When content is less than 0.005%, the oxysulfide being difficult to be formed sufficient amount is mingled with, and is difficult to the object reaching crystal grain thinning tissue; When content is more than 0.008%, then can form thick sulfide, the starting point that these thick sulfide can be formed as crackle, reduce the toughness of mother metal and welded heat affecting zone, too high S content also will cause the center segregation of slab simultaneously.
4. the complex inclusion technology of above-mentioned patent disclosure is based on oxysulfide, oxynitride, these particles mostly are the inclusion particle of size > 1 μm, and lack quantitative description to features such as the smelting technology of the pure-oxide clitaminating particle of smaller szie and its chemical composition, size, area density, ratios.
Summary of the invention
The object of this invention is to provide the smelting process of the steel plate of a kind of high heat-input welded heat affecting zone excellent performance.This smelting process can make the composite oxide forming small and dispersed in steel plate be mingled with, effectively pin welded heat affecting zone Austenite Grain Growth, promote that intracrystalline fine ferrite is formed, thus after making industrialization high heat-input weld (300 ~ 600kJ/cm), welded heat affecting zone tensile strength >=490MPa ,-40 DEG C are impacted impelling strength >=100J.
The present invention is achieved through the following technical solutions:
The smelting process of the steel plate of a kind of high heat-input welded heat affecting zone excellent performance, adopt hot metal pretreatment, steel-making by combined-blown converter, LF refining, RH vacuum refinement, alloy claded wire feed silk, continuous casting production process, it is characterized in that: in smelting technology, control molten steel dissolved oxygen content on crucial station, the oxygen level of converter tapping is 600 ~ 800ppm, forbid to use Al deoxidation, finishing slag basicity is 3.0 ~ 4.0; LF refining station makes white slag deoxidation, and final slag composition controls as CaO/SiO
2=1.8 ~ 2.5, tapping oxygen level is 100 ~ 150ppm.
Further, in described smelting process, it is 10 ~ 120ppm that RH refining station adds ferrotianium predetermination oxygen, and broken when oxygen level is 5 ~ 60ppm when vacating steel, soft stirring adds ferro-boron in 3 minutes later; Treat that molten steel temperature reaches 1600 ~ 1630 DEG C, determining oxygen is 10 ~ 120ppm, broken when oxygen level is 5 ~ 60ppm when vacating steel, in molten steel with the feeding of 4 ~ 5m/s speed totally 200 ~ 400m magnesium alloy, zirconium alloy cored-wire one or both, and ensure that the soft stirring of BOTTOM ARGON BLOWING is no less than 5 minutes.
The chemical constitution that the smelting process of the steel plate of described high heat-input welded heat affecting zone excellent performance smelts obtained steel plate counts C0.04 ~ 0.1% according to mass percent, Si0.1 ~ 0.2%, Mn1.0 ~ 2.0%, P≤0.008%, S≤0.005%, Ni0.2 ~ 0.4%, Nb0.01 ~ 0.03%, V0.01 ~ 0.03%, Al < 0.01, Ti0.01 ~ 0.05%, B0.001 ~ 0.005%, O0.001 ~ 0.005% and Mg0.0002 ~ 0.02%, one or both in Zr0.0002 ~ 0.02%, all the other are iron and inevitable impurity element, 5 < Ti/O < 12 simultaneously, (Mg+Zr)/(Ti+Al) > 0.02.
Further, in the steel plate that described smelting process obtains containing Ti-Mg, Ti-Zr, Ti-Mg-Zr composite oxides be mingled with in one or both, the mass percent of its chemical constitution is 2% < Ti < 40%, 2% < Mg < 30%, 2% < Zr < 30%, 5% < O < 50%, area density is greater than 300/mm
2, and more than 80% inclusion size is less than 1 μm.
Further, the steel plate that described smelting process obtains is under thermal weld stress amount is 300 ~ 600kJ/cm condition, and welded heat affecting zone tensile strength >=490MPa ,-40 DEG C are impacted impelling strength >=100J.
In the Composition Design of steel of the present invention:
C, strengthens the element of steel strength.For TMCP steel plate, in order to ensure specific intensity, the lower limit of C content is 0.04%.Simultaneously in order to suppress the content of heat affected zone island martensite body tissue, therefore capping is 0.1%.
Si, important pre-deoxidation element, and to mother metal, there is strengthening effect, therefore need more than 0.1%, add with ferrosilicon converter tapping about 1/5 time in the present invention.But work as more than 0.2%, then can make to generate too much island-like martensite but degraded toughness in high heat-input welded heat affecting zone, therefore capping is 0.2%.More preferably 0.1 ~ 0.15%.
Mn, pre-deoxidation and mother metal strengthening element.Exceed for making strength of parent and rely on other precious metal element, need containing more than 1.0%.On the other hand, excessive Mn can cause central segregation of slab, and cause the sclerosis of high heat-input welded heat affecting zone and island-like martensite to be produced simultaneously, reduce heat affected zone toughness, therefore the upper limit of Mn controls to be 2%.
P, the harmful element in steel, should reduce as far as possible.Too high P content will cause center segregation, and reduce heat affected zone toughness, therefore upper control limit is 0.008%.
S, exists as impurity element in the present invention.Too high S content not only easily causes central segregation of slab, also can the large-sized sulfide duplex impurity of forming section, suppresses the formation of tiny Mass oxide compound duplex impurity in the present invention, is unfavorable for the improvement of the toughness of mother metal and welded heat affecting zone.Therefore upper control limit is 0.005%.
Ni, improve the effective element of intensity and low-temperature flexibility, its lower limit is 0.2%.But because it is expensive, in view of cost consideration, its upper limit is 0.4%.
Nb, guarantees the effective element of strength of parent, toughness and strength of joint.But lower than 0.01% time, effect is not remarkable.But excessively add Nb, also can promote that heat affected zone island-like martensite is formed and worsens toughness, therefore controlling its upper limit is 0.03%.
V, has the element improving hardenability and anti-temper softening effect, favourable to raising high heat-input welded heat affecting zone intensity.But lower than 0.01% time, above-mentioned effect is not remarkable.If but V is excessive, then base metal tenacity and the deterioration of heat affected zone toughness, be therefore taken as 0.03% by its upper limit.
Al, exists as impurity element in the present invention.The content of Al (acid-soluble state) is limited in less than 0.01%, thus the quantity of aluminate in reduction steel, and the titaniferous amount of oxide inclusion can be increased to a certain extent, be conducive to the small and dispersed that composite oxide is mingled with, thus improve welding property; In addition the minimizing of dissolved aluminum, decreases the generation of crystal boundary ferrite side plate, is also beneficial to the raising of low-temperature flexibility.
Ti, the Ti oxide compound formed when solidifying as secondary deoxidation products is also Dispersed precipitate, these particles will be mingled with the center of formation as follow-up Mg, Zr composite oxides, thus contribute to suppressing the austenite coarsening in welded heat affecting zone, or promote Intragranular Acicular Ferrite phase deformed nucleus and improve toughness.There are some researches prove, less containing Ti oxide particle size, then the effect of pinning austenite grain boundary and the tiny Intragranular Acicular Ferrite forming core of promotion is better.Ensureing in the present invention that the composite oxides of size < less than 1.0 μm are mingled with content is the key measure guaranteeing high heat-input welded heat affecting zone performance.Therefore, if the addition of Ti is lower than 0.01%, then cannot guarantee the amount containing Ti inclusion, on the other hand, when Ti is superfluous, the titanium oxide easily forming size thick is mingled with, and is unfavorable for the size control that composite oxides are mingled with.Therefore, the upper content limit of Ti is 0.05%.
B, improves the element of hardening capacity, can refinement steel plate tissue improve intensity.In the present invention, being added with of micro-B is beneficial to the phase in version behavior of steel plate in Thermal Cycle process, suppresses the generation of crystal boundary Wei Shi body, ferrite side plate, thus is complex inclusion promotion Intragranular Acicular Ferrite forming core creation prerequisite.Meanwhile, and B easily has an effect with free oxygen in steel and nitrogen and loses above-mentioned beneficial effect, therefore RH station first adds the solid oxygen of ferrotianium and residual nitrogen element, then adds appropriate ferro-boron, the recovery rate of the micro-B of guarantee.On the other hand, when too high B can make high heat-input weld, form thick bainite structure, worsen heat affected zone toughness on the contrary.To sum up consider, restriction B content is 0.001 ~ 0.005%.
O, forms the key element that composite oxides are mingled with.It is pinning austenite grain boundary in the present invention that the composite oxides forming a large amount of small and dispersed are mingled with, and promotes Intragranular Acicular Ferrite forming core, thus guarantees the gordian technique of high heat-input welded heat affecting zone toughness and tenacity.In order to play such effect, O content is not less than 0.001%.On the other hand, excessive O is easily just formed thick containing Ti oxide particle when Ti deoxidation, worsen the toughness of heat affected zone on the contrary.Therefore, limiting O upper content limit is 0.005%.
Simultaneously, consider from the deoxidation equilibrium of Ti, as Ti/O < 5, make on the one hand sharply to reduce containing Ti oxide particle quantity, deoxidation deficiency also affects the recovery rate of follow-up trace alloying element on the other hand, finally affects the quantity of complex inclusion particle; As Ti/O > 12, TiO particle coarsening, simultaneously superfluous Ti is easily combined with C and forms solely large TiC particle, and these all likely become the starting point that crackle occurs, and reduces the toughness of mother metal and heat affected zone.
Therefore, the strict O content controlled on crucial station is the prerequisite ensureing useful complex inclusion size of particles and quantity in steel plate.In the present invention, the oxygen level of converter tapping is that 500 ~ 800ppm, LF refining station makes white slag deoxidation, and tapping oxygen level is that 100 ~ 150ppm, RH refining station degassing time is no less than 10 minutes, and ensure broken when vacating steel oxygen level be 5 ~ 60ppm.
Mg, Zr, form the important element that composite oxides are mingled with, be conducive to promoting ferritic multidimensional forming core.After in the present invention, RH station breaks sky, add with alloy claded wire, the high-temperature reductibility of Mg, Zr is stronger than Ti, oxidized thus form Mg-Ti, Zr-Ti or Mg-Zr-Ti complex inclusion on TiO clitaminating particle surface.Be mingled with surface by Mg, Zr at TiO to separate out, on the one hand can make oxide particle dispersion, on the other hand also can the size of refinement oxide particle.In order to play this effect, Mg, Zr content all should more than 0.0002%, but when more than 0.02%, above-mentioned effect also can be saturated.
Dystectic composite oxide particle has the multidimensional forming core that can promote Intragranular Acicular Ferrite, thus refining grain size improves toughness.The present invention determines the composition of these advantageous particles, size and quantity.Grind sample and after mirror polish, utilize Zeiss scanning electron microscope (SEM) carry out observing to inclusion and analyze, the evaluative component of each specimen holder foreign material is the mean value 10 being chosen arbitrarily to inclusion analysis result.Utilize SEM to carry out inclusion scan statistics for 40 visual fields chosen continuously under 1500 times of enlargement ratios, the visual field area added up is greater than 0.2mm
2.The area density of inclusion is the calculation result of viewed the amount of inclusions and visual field area.
As (Mg+Zr)/(Ti+Al) > 0.2, in steel plate containing Ti-Mg, Ti-Zr, Ti-Mg-Zr composite oxides be mingled with in one or both, the chemical constitution mass percent of these inclusiones meets 2% < Ti < 40%, 2% < Mg < 30%, 2% < Zr < 30%, 5% < O < 50%, area density is greater than 300/mm
2, and satisfied more than 80% inclusion size is less than 1 μm.These submicron order inclusiones on the one hand easy in soft whipping process Dispersed precipitate, be conducive to the increase of the amount of inclusions; On the other hand, can promote to be that the ferrite of core is formed with fine foreign matter, thus improve the high heat-input welding property of heat affected zone.
Compared with prior art, beneficial effect of the present invention:
The present invention takes suitable O content to control and alloying element control techniques, by the conservative control to Ti/O in steel and (Mg+Zr)/(Ti+Al), make to be formed in steel Mg-Ti, Zr-Ti, Mg-Zr-Ti complex inclusion that size is less than 1 μm, and the composition of these inclusiones of conservative control and quantity, utilize the austenite grain boundary pinning effect of these inclusiones and the promoter action of Intragranular Acicular Ferrite forming core, significantly improve the performance of high heat-input welding heat affected zone.According to the steel plate that the present invention smelts, mother metal tensile strength >=550Mpa, under thermal weld stress is 300 ~ 600kJ/cm condition, welded heat affecting zone tensile strength >=490MPa ,-40 DEG C are impacted impelling strength >=100J.
Accompanying drawing explanation
Fig. 1 typical case Mg-Ti composite oxides are mingled with pattern and component EDS maps.
Embodiment
Below in conjunction with embodiment, the present invention will be further described.
The smelting molten steel operation that the present invention announces is as follows:
Hot metal pretreatment → 180t combined blown converter smelting → LF refining → RH refining → alloy claded wire feeds silk → continuous casting.Be specially:
1. converter steelmaking iron water amount and clean steel scrap ratio are 7.5, molten iron temperature 1400 DEG C, S≤0.003% by weight percentage, converter finishing slag basicity 3.0 ~ 4.0, and wherein MgO ratio is 8.0 ~ 10.0%.Determine oxygen tapping, about add ferromanganese, ferrosilicon, lime successively during 1/3 stove.
2.LF refining process uses calcium carbide to adjust to white slag, and finishing slag controls as CaO/SiO
2=1.8 ~ 2.5, then add the adjustment such as manganese metal, ferro-niobium, vanadium iron, ferrosilicon molten steel component, the latter 5 minutes thermometrics of being energized, sampling, continue diffusive deoxidation, adjustment temperature, finally samples, determines oxygen, tapping.
Under 3.RH refining requires that vacuum tightness is less than 2mbar condition, be degassedly greater than 10 minutes.Determine oxygen after ladle arrives at a station, after vacuum tightness puts in place, add ferrotianium, after 3 minutes, add ferro-boron, and according to alloy such as sampling fine setting manganese, silicon etc.After alloying, clean circulation thermometric after 5 minutes, determine oxygen, finally break and vacate steel.
4. to RH set off feed total 200 ~ 400 meters in ladle nickel magnesium cored-wire, silicon-zirconium cored-wire one or both, cored-wire is of a size of 10 ~ 15mm, and feeding wire speed is 4 ~ 5m/s; Ensure the soft churning time being not less than 5 minutes after line feeding, before tapping, add ultralow carbonization rice husk thermal insulation.
5. pouring temperature controls at 1540 ~ 1560 DEG C, and casting speed control is 1.2m/min, and obtained thickness is the continuous casting steel billet of 320mm.
Adopt Clean Steel rolling technology that above-mentioned slab rolling is become 30 ~ 60mm steel plate, adopt the steel plate of electroslag welding to different thickness to implement a time welding, thermal weld stress is 300 ~ 600kJ/cm.
Table 1 is the chemical composition of the embodiment of the present invention and comparative example, Ti/O and (Mg+Zr)/(Ti+Al) ratio.Table 2 is complex inclusion characteristic and the high heat-input welded heat affecting zone mechanical property of the embodiment of the present invention and comparative example.Fig. 1 is pattern and the component EDS maps of exemplary complex oxide inclusion particle.
The chemical composition of table 1 embodiment of the present invention and comparative example
From table 1 and table 2, control according to the determined chemical composition ranges of the present invention in embodiment 1 ~ 3, make 5 < Ti/O < 12 in steel plate, (Mg+Zr)/(Ti+Al) > 0.02, and the composite oxides making size be less than 1 μm are mingled with and account for more than 80%, area density>=300/mm
2, the pattern of typical oxidation thing clitaminating particle, size and composition EDS maps are as shown in Figure 1.The chemical constitution mass percent of these inclusiones meets 2% < Ti < 40%, 2% < Mg < 30%, 2% < Zr < 30%, 5% < O < 50%.And in comparative example 1 ~ 3, fail to reach the proportional range of Ti/O and (Mg+Zr)/(Ti+Al), inclusion kind, size and area density therefore in steel plate all can not reach requirement of the present invention.
Mechanical test result shows, the strength of parent of embodiment and comparative example does not have notable difference, the requirement of tensile strength >=550MPa can be met, but after the heat input welding of 300 ~ 600kJ/cm, the heat affected zone tensile strength of embodiment all can meet >=requirement of 490MPa, and comparative example is softening comparatively serious.On the other hand ,-40 DEG C, the heat affected zone impelling strength >=100J of embodiment, and comparative example can not reach above-mentioned requirements.Therefore, according to smelting process of the present invention, the steel plate of high heat-input welded heat affecting zone excellent performance can be produced.
Above-described embodiment is only and technical conceive of the present invention and feature is described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to spirit of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
The inclusion characteristic of table 2 embodiment of the present invention and comparative example and heat affected zone mechanical property
The above embodiment only have expressed the specific embodiment of the present invention, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.Those skilled in the art all drops in protection scope of the present invention any variation that the present invention does under the enlightenment that the present invention conceives.
Claims (5)
1. the smelting process of the steel plate of a high heat-input welded heat affecting zone excellent performance, it is characterized in that: adopt hot metal pretreatment, steel-making by combined-blown converter, LF refining, RH vacuum refinement, alloy claded wire feed silk, continuous casting production process, it is characterized in that: in smelting technology, control molten steel dissolved oxygen content on crucial station, the oxygen level of converter tapping is 600 ~ 800ppm, forbid to use Al deoxidation, finishing slag basicity is 3.0 ~ 4.0; LF refining station makes white slag deoxidation, and final slag composition controls as CaO/SiO
2=1.8 ~ 2.5, tapping oxygen level is 100 ~ 150ppm.
2. the smelting process of the steel plate of high heat-input welded heat affecting zone according to claim 1 excellent performance, it is characterized in that: in described smelting process, it is 10 ~ 120ppm that RH refining station adds ferrotianium predetermination oxygen, broken when oxygen level is 5 ~ 60ppm when vacating steel, soft stirring adds ferro-boron in 3 minutes later; Treat that molten steel temperature reaches 1600 ~ 1630 DEG C, determining oxygen is 10 ~ 120ppm, broken when oxygen level is 5 ~ 60ppm when vacating steel, in molten steel with the feeding of 4 ~ 5m/s speed totally 200 ~ 400m magnesium alloy, zirconium alloy cored-wire one or both, and ensure that the soft stirring of BOTTOM ARGON BLOWING is no less than 5 minutes.
3. the smelting process of the steel plate of high heat-input welded heat affecting zone according to claim 1 and 2 excellent performance, it is characterized in that: the chemical constitution that described smelting process smelts obtained steel plate counts C0.04 ~ 0.1% according to mass percent, Si0.1 ~ 0.2%, Mn1.0 ~ 2.0%, P≤0.008%, S≤0.005%, Ni0.2 ~ 0.4%, Nb0.01 ~ 0.03%, V0.01 ~ 0.03%, Al < 0.01, Ti0.01 ~ 0.05%, B0.001 ~ 0.005%, O0.001 ~ 0.005% and Mg0.0002 ~ 0.02%, one or both in Zr0.0002 ~ 0.02%, all the other are iron and inevitable impurity element, 5 < Ti/O < 12 simultaneously, (Mg+Zr)/(Ti+Al) > 0.02.
4. the smelting process of the steel plate of high heat-input welded heat affecting zone according to claim 3 excellent performance, it is characterized in that: containing Ti-Mg in the steel plate that described smelting process is obtained, Ti-Zr, one or both during Ti-Mg-Zr composite oxides are mingled with, the mass percent of its chemical constitution is 2% < Ti < 40%, 2% < Mg < 30%, 2% < Zr < 30%, 5% < O < 50%, area density is greater than 300/mm
2, and more than 80% inclusion size is less than 1 μm.
5. the smelting process of the steel plate of high heat-input welded heat affecting zone according to claim 3 excellent performance, it is characterized in that: the steel plate that described smelting process obtains is under thermal weld stress amount is 300 ~ 600kJ/cm condition, welded heat affecting zone tensile strength >=490MPa ,-40 DEG C are impacted impelling strength >=100J.
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