CN105779869A - Internal quality control method of 30Mn tube bloom steel cast blanks - Google Patents
Internal quality control method of 30Mn tube bloom steel cast blanks Download PDFInfo
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- CN105779869A CN105779869A CN201610170001.XA CN201610170001A CN105779869A CN 105779869 A CN105779869 A CN 105779869A CN 201610170001 A CN201610170001 A CN 201610170001A CN 105779869 A CN105779869 A CN 105779869A
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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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
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Abstract
The invention relates to the field of ferrous metallurgy and particularly relates to an internal quality control method of 30Mn tube bloom steel cast blanks. The technical problem to be solved is to provide an internal quality control method of 30Mn tube bloom steel cast blanks; the method is capable of effectively controlling crack defects of cast blanks, effectively improving solidification structures of the cast blanks and achieving the internal quality control. The method comprises the following steps: a, firstly carrying out a converter smelting process; b, secondly carrying out an LF furnace molten steel refining process; and c, finally carrying out section continuous casting process, wherein electromagnetic stirring parameters of a crystallizer are characterized in that the stirring current is 300-400A, and the frequency is 2-4Hz; electromagnetic stirring parameters of a solidification end are characterized in that the stirring current is 100-200A, and the frequency is 4.0-7.0Hz; the superheat degree is controlled to be 25-35 DEG C; the pulling rate is controlled to be 0.70-1.00m/min; the cooling rate of the crystallizer is controlled to be 2400-2500L/min; the specific special water flow rate of secondary cooling is controlled to be 0.21-0.30/kg steel. The internal quality control method of the 30Mn tube bloom steel cast blanks is especially applicable to the internal quality control process of large-size 30Mn tube bloom steel cast blanks produced by phi 350mm section.
Description
Technical field
The present invention relates to field of steel metallurgy, the method that especially a kind of 30Mn circular pipe blank steel Inner Quality of Billet controls.
Background technology
For 30Mn tube blank steel, it is stronger that the middle carbon in steel grades, the Fe content itself of 1.28%～1.42% determine continuous casting production process strand crack sensitivity.Low mainly due to steel grade heat conductivity, linear expansion coefficient is big, produces bigger internal stress in cooled and solidified process, it is easy to produce surface crack defect；Furthermore, due to casting blank section is relatively large and for circle base, its specific surface area less strand heat transfer efficiency is lower, solidification cooling is slowly, after green shell is formed, under heat transfer efficiency, general who has surrendered causes that strand cross section radial symmetry gradient becomes big, and heat transfer directivity highlights, further result in column crystal prosperity, the trend that equiaxial crystal ratio is relatively low.Therefore, casting process to take into account crackle control and casting blank solidification organization optimization, it is achieved difficulty is bigger.Continuous casting production process optimizes casting blank solidification tissue, weakens solidification and heat transfer directivity, and the generation controlling strand crackle further is the key of Comprehensive Control 30Mn circular pipe blank slab quality.As metallurgical work studies, improve the emphasis that 30Mn circular pipe blank strand comprehensive quality is research, especially as improved 30Mn circular pipe blank strand equiaxial crystal ratio, controlling strand crackle.
Such as: CN101412082 discloses a kind of production method preventing middle carbon high manganese steel crackle.This invention is solved the technical problem that as the technical problem that the middle carbon high manganese steel square billet preventing continuous casting process from producing cracks.The preparation method of middle carbon high manganese steel square billet includes following flow process: converter smelting LF+RH refine billet continuous casting, it is characterised in that: when continuous casting, control pulling speed of continuous casting is 0.3～0.7m/min, and intensity of cooling is 0.37～0.53L/kg.Simultaneously controlling Al content in steel at RH refine station is after 0.010%～0.050%, adds ferro-titanium and controls Ti content 0.015%～0.045% in steel.By above-mentioned improvement, the crackle of the strong middle carbon high manganese steel bloom of crack sensitivity can be eliminated.But concrete grammar φ 350mm section being produced to the control of bigger specification 30Mn circular pipe blank slab quality is not directed to.nullThe open a kind of Medium Carbon Steel Containing Manganese continuous crystallizer protecting slag of CN103008590A,It is characterized in that: covering slag composition percentage by weight is: SiO2 controls at 30.0～40.0wt%,CaO controls at 13.0～22.3wt%,MgO controls at 2.0～7.0wt%,A12O3 controls at 3.0～6.0wt%,Fe2O3 controls at 1.0～3.0wt%,MnO controls at 1.0～4.2wt%,Na2O controls at 1.2～5.0wt%,F controls at 2～7.3wt%,C controls at 12～21.3wt%,K2O requirement≤2.0wt%,Li2O≤1.0wt%,B2O3≤1.0wt%,TiO2≤0.6wt%,All the other are moisture and inevitable impurity.Its advantage is: basicity is low, viscosity is low, hot-fluid is uniform, its slag has good mobility and stability at high operating temperatures, it is effectively controlled the uniformity of crystallizer hot-fluid, suitable in the billet continuous casting production process of efficient stable, the quality of strand and yield can be made to be largely increased.But concrete grammar φ 350mm section being produced to the control of bigger specification 30Mn circular pipe blank slab quality is still not directed to.CN101508011 discloses a kind of production method preventing Medium Carbon Steel Containing Manganese casting billet surface lobe, and technical problem to be solved is provide a kind of production method preventing Medium Carbon Steel Containing Manganese surface longitudinal crack of slab.This production method comprises the steps: A. conventionally converter smelting, alloying after smelting, and controlling its carbon content be 0.25%-0.40%, Fe content is 1.25%-1.75%；B. in molten steel, add aluminum after alloying carry out final deoxidizing；C. molten steel continuous casting, obtains Medium Carbon Steel Containing Manganese.It is characterized in that: adding ferro-titanium after step B final deoxidizing, controlling its Ti content is 0.005%-0.0145%；Add ferro-titanium and carry out molten steel continuous casting again.The purpose avoiding Medium Carbon Steel Containing Manganese continuous casting billet to produce surface longitudinal crack defect is achieved by this improvement.But concrete grammar φ 350mm section being produced to the control of bigger specification 30Mn circular pipe blank strand comprehensive quality is still not directed to.
Summary of the invention
The technical problem to be solved is to provide one allows strand crack defect be effectively controlled, and casting blank solidification tissue is effectively improved, thus the method that the 30Mn circular pipe blank steel Inner Quality of Billet realizing internal quality control controls.
The technical solution adopted for the present invention to solve the technical problems is: the method that 30Mn circular pipe blank steel Inner Quality of Billet controls, and comprises the following steps:
A, first it is converter smelting process, wherein the carbon content of converter terminal ranges for 0.05%～0.15%, temperature range >=1670 DEG C of terminal, chain-wales is fed by the feed quantity of ton steel 1.5～2.0m and is added aluminum steel, carry out deoxidation treatment, chain-wales target component is pressed: carbon is 0.25%～0.30%, element silicon is 0.18%～0.25%, manganese element is 1.20%～1.30%, P elements≤0.015% is controlled, and deoxidation alloying carries out the soft blow more than or equal to 3min after terminating；
Secondly b, it is LF stove refined molten steel technique, wherein carry out trimming before departures, refine adds titanium alloy material latter stage, addition by the 0.020%～0.035% of molten steel weight carry out with addition of, carry out the feed quantity of 200～500m afterwards to feed and add silicon-calcium wire and carry out Calcium treatment, in wherein, bag the first heat is fed by the upper limit and is added, and carries out the soft blow more than or equal to 6min and stir after line feeding, and LF departures target temperature is controlled according to 1560～1600 DEG C；
C, finally it is section continuous casting process, wherein: M-EMS parameter is stir current 300～400A, 2～4Hz；Solidification end stirring parameter is stir current 100～200A, frequency 4.0～7.0Hz；The degree of superheat controls at 25～35 DEG C；Casting speed control is at 0.70～1.00m/min；Crystallizer cooling controls at 2400～2500L/min；Two cold specific waters control at 0.21～0.30/kgSteel。
Further, in described step a, to avoid, molten steel is exposed to be as the criterion the Argon intensity of the soft blow that deoxidation alloying carries out after terminating.
The invention has the beneficial effects as follows: the present invention is realized casting blank solidification Heat Transfer Optimization by the method for " M-EMS+solidification end electromagnetic agitation " M+F-EMS, realize bigger specification 30Mn circular pipe blank solidified structure is controlled, improve casting blank solidification tissue equiaxial crystal ratio, improve strand low power grading quality level and strand consistency occurrence.Its mechanism of action is: M-EMS produces electromagnetic torque by magnetic field, changes crystallizer internal flow field of molten steel, thermo parameters method situation, promotes Mold composition, equalizing temperature, weaken solidification and heat transfer directivity, promote green shell homoepitaxial；Further, fusing, by forcing to drive the flowing of mushy zone molten steel, is washed away by solidification end electromagnetic agitation by columanar structure, improve equiax crystal nucleation rate, it is suppressed that column crystal grows, improve strand equiaxial crystal ratio, finally realize the raising of strand central dense degree, improve Inner Quality of Billet；But, solidification end electromagnetic agitation intensity is crossed and is by force then easily caused dentrite tip and wash away seriously, causes that the low solute concentration molten steel of the strong mobility of low melting point is assembled ringwise, formation white band；Furthermore, the rational degree of superheat and pulling rate match control and intensity of secondary cooling formulate the key being casting blank solidification heat transfer is controlled, the key that namely strand center mass controls.It addition, by molten steel is carried out Trace Titanium Treatment, improve high-temp plastic, reduce steel grade crack sensitivity.Present invention is particularly suitable for φ 350mm section to produce among bigger specification 30Mn circular pipe blank steel Inner Quality of Billet control technique.
Detailed description of the invention
The method that 30Mn circular pipe blank steel Inner Quality of Billet controls, comprise the following steps: a, first for converter smelting process, wherein the carbon content of converter terminal ranges for 0.05%～0.15%, temperature range >=1670 DEG C of terminal, chain-wales is fed by the feed quantity of ton steel 1.5～2.0m and is added aluminum steel, carry out deoxidation treatment, chain-wales target component is pressed: carbon is 0.25%～0.30%, element silicon is 0.18%～0.25%, manganese element is 1.20%～1.30%, P elements≤0.015% is controlled, and deoxidation alloying carries out the soft blow more than or equal to 3min after terminating；Secondly b, it is LF stove refined molten steel technique, wherein carry out trimming before departures, refine adds titanium alloy material latter stage, addition by the 0.020%～0.035% of molten steel weight carry out with addition of, carry out the feed quantity of 200～500m afterwards to feed and add silicon-calcium wire and carry out Calcium treatment, in wherein, bag the first heat is fed by the upper limit and is added, and carries out the soft blow more than or equal to 6min and stir after line feeding, and LF departures target temperature is controlled according to 1560～1600 DEG C；C, finally it is section continuous casting process, wherein: M-EMS parameter is stir current 300～400A, 2～4Hz；Solidification end stirring parameter is stir current 100～200A, frequency 4.0～7.0Hz；The degree of superheat controls at 25～35 DEG C；Casting speed control is at 0.70～1.00m/min；Crystallizer cooling controls at 2400～2500L/min；Two cold specific waters control at 0.21～0.30/kg steel.
During actual production, the steel grade chemical constituent adopted is by weight percentage: C:0.30%～0.34%, Si:0.20%～0.34%, Mn:1.28%～1.42%, P≤0.025%, S≤0.020%, Cr≤0.15%, Cu≤0.20%, Ni≤0.25%, As, Sn content requirement in steel: As≤0.030%, Sn≤0.010%, 0.4As+6Sn≤0.072%；All the other residual elements require: Ti≤0.04%, Mo≤0.10%, V≤0.020%, Nb≤0.01%, B≤0.0005%, surplus is Fe.Under normal circumstances, in continuous casting process, casting blank solidification tissue presents the crystallizer tissue regions in " chill fine grained region, columnar zone, Center Equiaxial Crystal district " from casting billet surface to center.Improve strand equiaxial crystal ratio for improving slab quality, improve strand central area consistency, current metallurgy industry emerges kinds of processes technology, the method wherein improving strand center porosity just has electromagnetic agitating technology and solidification end Reduction Technology, and for circle base, for ensureing the regular demand of strand overall dimensions, do not use solidification end Reduction Technology.
Embodiment
Embodiment 1
Certain steel mill adopts 120t converter smelting → LF stove refine → tetra-machine four to flow casting machine φ 350mm section continuous casting and produces 30Mn circular pipe blank.When bessemerizing end, aim carbon is 0.10% be controlled, and outlet temperature controls at 1675 DEG C；Chain-wales feeds aluminum steel by 1.7m/t steel and carries out deoxidation；Chain-wales departures Composition Control is: [C] 0.27%, [Si] 0.22%, [Mn] 1.24%, [P] 0.013%；Carrying out soft blow argon stirring, mixing time 3.7min after deoxidation alloying, stirring does not occur that molten steel is exposed.
Molten steel arrives LF refining furnace place, carries out Argon molten steel and slightly fluctuates, do not occur turning over greatly phenomenon, after refine terminates, by the 0.026% of molten steel weight with addition of Ti；With addition of after feed and add 400m silicon-calcium wire and carry out Calcium treatment, carried out the soft blow stirring of 7.5min after line feeding, LF out-station temperature is 1587 DEG C.
LF refining treatment is allocated and transported after terminating and is flowed casting machine φ 350mm section to four machines four and carry out molten steel casting, and actual control of the critical technical parameter relevant to application claims is: M-EMS: stir current 365A, stirring frequency 2.0Hz；Solidification end electromagnetic agitation: stir current 100A, stirring frequency 7.0Hz；The actual casting process degree of superheat of molten steel controls at 25～30 DEG C；Pulling rate is 0.7m/min；Crystallizer cooling controls at 2456L/min；Two cold specific waters control at 0.21/kg steel.
After above-mentioned technological invention is stably used, slab quality is well controlled, and strand low power testing result is: strand sedimentation 0.5～1.0 grade, non-densified regions diameter proportion 40.2%；The defects such as casting billet surface flawless, casting billet surface comprehensively reaches 99.2% without cleaning rate.Strand in-situ metal analyzes consistency detection, and central area is 0.82, strand equiax crystal section length ratio 50.1%～53.9%；It is 0.96～1.05 that strand bores sample segregation testing result.
Embodiment 2
Certain steel mill adopts 120t converter smelting → LF stove refine → tetra-machine four to flow casting machine φ 350mm section continuous casting and produces 30Mn circular pipe blank.When bessemerizing end, aim carbon is 0.15% be controlled, and outlet temperature controls at 1673 DEG C；Chain-wales feeds aluminum steel by 1.5m/t steel and carries out deoxidation；Chain-wales departures Composition Control is: [C] 0.25%, [Si] 0.25%, [Mn] 1.20%, [P] 0.013%；Carrying out soft blow argon stirring, mixing time 4.5min after deoxidation alloying, stirring does not occur that molten steel is exposed.
Molten steel arrives LF refining furnace place, carries out Argon molten steel and slightly fluctuates, do not occur turning over greatly phenomenon, after refine terminates, by the 0.020% of molten steel weight with addition of Ti；With addition of after feed and add 200m silicon-calcium wire and carry out Calcium treatment, carried out the soft blow stirring of 7.3min after line feeding, LF out-station temperature is 1560 DEG C.
LF refining treatment is allocated and transported after terminating and is flowed casting machine φ 350mm section to four machines four and carry out molten steel casting, and actual control of the critical technical parameter relevant to application claims is: M-EMS: stir current 300A, stirring frequency 3.2Hz；Solidification end electromagnetic agitation: stir current 175A, stirring frequency 5.5Hz；The actual casting process degree of superheat of molten steel controls at 28～34 DEG C；Pulling rate is 1.00m/min；Crystallizer cooling controls at 2400L/min；Two cold specific waters control at 0.30/kgSteel。
After above-mentioned technological invention is stably used, slab quality is well controlled, and strand low power testing result is: strand sedimentation 0.5 grade, non-densified regions diameter proportion 38.8%；The defects such as casting billet surface flawless, casting billet surface comprehensively reaches 98.7% without cleaning rate.Strand in-situ metal analyzes consistency detection, and central area is 0.88, strand equiax crystal section length ratio 51.4%～56.4%；It is 0.95～1.04 that strand bores sample segregation testing result.
Embodiment 3
Certain steel mill adopts 120t converter smelting → LF stove refine → tetra-machine four to flow casting machine φ 350mm section continuous casting and produces 30Mn circular pipe blank.When bessemerizing end, aim carbon is 0.05% be controlled, and outlet temperature controls at 1680 DEG C；Chain-wales feeds aluminum steel by 2.0m/t steel and carries out deoxidation；Chain-wales departures Composition Control is: [C] 0.30%, [Si] 0.18%, [Mn] 1.30%, [P] 0.009%；Carrying out soft blow argon stirring, mixing time 4.0min after deoxidation alloying, stirring does not occur that molten steel is exposed.
Molten steel arrives LF refining furnace place, carries out Argon molten steel and slightly fluctuates, do not occur turning over greatly phenomenon, after refine terminates, by the 0.035% of molten steel weight with addition of Ti；With addition of after feed and add 500m silicon-calcium wire and carry out Calcium treatment, carried out the soft blow stirring of 6.5min after line feeding, LF out-station temperature is 1600 DEG C.
LF refining treatment is allocated and transported after terminating and is flowed casting machine φ 350mm section to four machines four and carry out molten steel casting, and actual control of the critical technical parameter relevant to application claims is: M-EMS: stir current 400A, stirring frequency 4.0Hz；Solidification end electromagnetic agitation: stir current 200A, stirring frequency 4.0Hz；The actual casting process degree of superheat of molten steel controls at 27～35 DEG C；Pulling rate is 0.86m/min；Crystallizer cooling controls at 2500L/min；Two cold specific waters control at 0.27/kgSteel。
After above-mentioned technological invention is stably used, slab quality is well controlled, and strand low power testing result is: strand sedimentation 0.5～1.0 grade, non-densified regions diameter proportion 41.1%；The defects such as casting billet surface flawless, casting billet surface comprehensively reaches 97.8% without cleaning rate.Strand in-situ metal analyzes consistency detection, and central area is 0.83, strand equiax crystal section length ratio 51.5%～53.2%；It is 0.96～1.04 that strand bores sample segregation testing result.
Above-described embodiment illustrates to adopt the φ 350mm section 30Mn circular pipe blank slab quality that the technology of the present invention produces to obtain effective control, particularly strand crackle controls and center porosity defects controlling, strand is without face crack, pickling low power grading center porosity is complete≤and 1.0 grades, center porosity region area diameter proportion≤41.1%, non-densified regions greatest length is 112mm, in-situ metal analyzer is adopted to carry out consistency detection strand center position area, all control more than 0.82, , strand equiax crystal section length ratio 50.1%～56.4%, it is 0.95～1.05 that strand bores sample segregation detection.
Claims (2)
- The method that 1.30Mn circular pipe blank steel Inner Quality of Billet controls, it is characterised in that comprise the following steps:A, first it is converter smelting process, wherein the carbon content of converter terminal ranges for 0.05%～0.15%, temperature range >=1670 DEG C of terminal, chain-wales is fed by the feed quantity of ton steel 1.5～2.0m and is added aluminum steel, carry out deoxidation treatment, chain-wales target component is pressed: carbon is 0.25%～0.30%, element silicon is 0.18%～0.25%, manganese element is 1.20%～1.30%, P elements≤0.015% is controlled, and deoxidation alloying carries out the soft blow more than or equal to 3min after terminating；Secondly b, it is LF stove refined molten steel technique, wherein carry out trimming before departures, refine adds titanium alloy material latter stage, addition by the 0.020%～0.035% of molten steel weight carry out with addition of, carry out the feed quantity of 200～500m afterwards to feed and add silicon-calcium wire and carry out Calcium treatment, in wherein, bag the first heat is fed by the upper limit and is added, and carries out the soft blow more than or equal to 6min and stir after line feeding, and LF departures target temperature is controlled according to 1560～1600 DEG C；C, finally it is section continuous casting process, wherein: M-EMS parameter is stir current 300～400A, 2～4Hz；Solidification end stirring parameter is stir current 100～200A, frequency 4.0～7.0Hz；The degree of superheat controls at 25～35 DEG C；Casting speed control is at 0.70～1.00m/min；Crystallizer cooling controls at 2400～2500L/min；Two cold specific waters control at 0.21～0.30/kgSteel。
- 2. the method that 30Mn circular pipe blank steel Inner Quality of Billet as claimed in claim 1 controls, it is characterised in that: in described step a, to avoid, molten steel is exposed to be as the criterion the Argon intensity of the soft blow that deoxidation alloying carries out after terminating.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111534742A (en) * | 2020-04-30 | 2020-08-14 | 天津钢管制造有限公司 | Pipe blank for preventing internal cracks of steel pipe blank of gas cylinder, manufacturing method and application |
| CN111896712A (en) * | 2020-08-03 | 2020-11-06 | 攀钢集团攀枝花钢钒有限公司 | Method for low-power quality inspection of continuous casting billet |
| CN115466825A (en) * | 2022-08-29 | 2022-12-13 | 包头钢铁（集团）有限责任公司 | Method for improving middle and subcutaneous cracks of high-strength weather-resistant anti-seismic peritectic steel beam blank flange plate |
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