CN109321815A - A kind of manufacturing method of resistance to Large Heat Input Welding high-strength steel plate - Google Patents

A kind of manufacturing method of resistance to Large Heat Input Welding high-strength steel plate Download PDF

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CN109321815A
CN109321815A CN201710640229.5A CN201710640229A CN109321815A CN 109321815 A CN109321815 A CN 109321815A CN 201710640229 A CN201710640229 A CN 201710640229A CN 109321815 A CN109321815 A CN 109321815A
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steel plate
heat input
manufacturing
large heat
resistance
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CN109321815B (en
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王超
王丙兴
王昭东
邓想涛
王国栋
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Northeastern University China
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Northeastern University China
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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
    • 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
    • C21C7/06—Deoxidising, e.g. killing
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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

Abstract

The invention belongs to Hi-Stren steel technical field, in particular to a kind of manufacturing method for the high-strength steel plate of resistance to Large Heat Input Welding.Steel plate chemical component includes one of C, Si, Mn, Nb, V, Ti, P, S, Cu, Ni, Mo, B, N, O, Al and Mg, Ca, Zr, REM, surplus Fe, and including special Ti-M-O inclusion distribution；Steel plate manufacturing step includes, and smelts process using LD-LF-RH, converter molten steel silicomanganese pre-deoxidation, LF refining desulfurization, RH vacuum outgas, to oxygen blowing in molten steel in RH furnace, and Ti and Mg, Ca, Zr or REM deoxidation is added；Cooling is rolled and controlled using two-stage control.Steel plate yield strength of the present invention reaches 500~700MPa, has good low-temperature impact toughness under 100~200kJ/cm weld heat input.

Description

A kind of manufacturing method of resistance to Large Heat Input Welding high-strength steel plate
Technical field
The invention belongs to Hi-Stren steel technical field, in particular to a kind of high-strength thick of resistance to Large Heat Input Welding steel The manufacturing method of plate.
Background technique
With the development of economy and society, the structure in each field such as skyscraper, energy storage and transportation, ship and ocean engineering constructs Constantly to high intensity and enlargement development, the intensity and thickness of required steel plate are increased considerably, and the very fast expansion of production scale is led to The welding workload for often building this kind of large scale structure accounts for about the 30~40% of amount of work.As a result, before guaranteeing welding quality It puts, how to improve welding efficiency is the key that realize that inexpensive economizing type quickly manufactures.In this context, large-sized steel structure Construction gradually adopt the single pass welding technique that can implement Large Heat Input Welding, increase substantially manufacture efficiency. And the performance severe exacerbation of welding point will occur under the conditions of Large Heat Input Welding in traditional steel, become restrict production efficiency and The critical issue of construction quality reliability.Therefore, can bear the high strength steel of Large Heat Input Welding is developed into current state The very urgent task of interior steel industry.
The patent of invention of Publication No. CN102312173A discloses a kind of tensile strength 700MPa grades of Large Heat Input Weldings Structural steel and its manufacturing method form the oxides such as Ti, Zr, do not need quenched place it is characterized in that being designed by reasonable composition Reason, using TMCP technique, it can be achieved that the Large Heat Input Welding of 30~100kJ/cm.The invention of Publication No. CN102041459A is special Benefit disclose one kind can Large Heat Input Welding HT690 steel plate and its manufacturing method, it is characterized in that using low C- high Mn- (Nb+V+B) Microalloying-ultra micro Ti processing component system properly increases the molten Al of acid in steel, the ratio relation between control element, optimization TMCP+ tempering process forms tiny tempering bainite, has Large Heat Input Welding performance.Publication No. CN105256095A's Patent of invention discloses a kind of smelting process of steel plate that high heat-input welding heat affected zone performance is excellent, it is characterized in that taking conjunction Suitable Control for Oxygen Content and alloying element control technology, passes through the reasonable control to Ti/O in steel and (Mg+Zr)/(Ti+Al), shape Mg-Ti, Zr-Ti, Mg-Zr-Ti complex inclusion at size less than 1 μm, improves high heat-input welding performance, and steel plate tension is strong Degree >=550MPa.The patent of invention of Publication No. CN102286692A discloses a kind of quenched cryogenic steel and its manufacturing method, It is characterized in that by control Mn/C, Ti/N, Ni/Cu, Ca/S ratio range, using recrystallization controlled rolling, online direct quenching, Tempering heat treatment process combines, and obtains excellent cryogenic property, can bear Large Heat Input Welding.Publication No. The patent of invention of CN102839330A discloses a kind of 800MPa grade high-strength Large Heat Input Welding slab, it is characterized in that low On the basis of carbon steel composition, Ni content is improved, while the alloying elements such as appropriate Cr, Mo are added, steel plate thickness is suitble within 30mm 40~100kJ/cm weld heat input.
By analyzing the prior art it is found that portion of techniques scheme utilizes TiN particle refinement austenite grain, raising HAZ Toughness, but due to easily decomposes under TiN high temperature, influence tissue thinning effect.Improve HAZ toughness using oxide or sulfide In technology, existing public technology is not clearly stated to method of deoxidation of the various elements under refining condition or technical difficulty is big, Complex process is unfavorable for the fine of field trash and is uniformly distributed, influence the actual effect of Large Heat Input Welding performance, and is unfavorable for The cleanliness for improving steel, influences steel product quality.In addition, improving steel plate toughness and tenacity and big line energy using higher Ni content is added Welding performance is measured, the raising of cost of alloy is caused, is unfavorable for promoting and applying.
Summary of the invention
The object of the present invention is to provide a kind of manufacturing methods of high-strength steel plate of resistance to Large Heat Input Welding, solve high-intensitive The problem of steel plate Large Heat Input Welding degraded performance, manufactured steel plate yield strength reach 500~700MPa, 100~ There is excellent low-temperature impact toughness under 200kJ/cm weld heat input.
The present invention adopts the following technical scheme that:
A kind of manufacturing method of resistance to Large Heat Input Welding high-strength steel plate, by mass percentage, steel plate chemical component It include: C 0.04~0.10%, Si 0.1~0.3%, Mn 1.0~1.8%, Nb 0.01~0.05%, V 0.01~ 0.05%, Ti 0.005~0.025%, P 0.001~0.008%, S 0.0005~0.005%, Cu 0.1~0.5%, Ni 0.1~0.5%, Mo 0.05~0.5%, B 0.0005~0.0025%, N 0.001~0.005%, O 0.001~ 0.005%, Al 0.001~0.015% and Mg 0.0005~0.005%, Ca 0.0005~0.005%, Zr 0.001 ~0.025%, one of REM 0.001~0.025%, surplus Fe；4 μm of size or more the amount of inclusions in steel plate≤ 150/mm3；Having a size of in 0.3~4 μm of field trash in steel plate, the quantity of Ti-M-O complex inclusion accounts for 10% or more, and And Ti-M-O field trash averagely contains Ti 1~50%, M 1~50%, wherein M is one of Mg, Ca, Zr, REM；
The method includes following processing steps:
(1) smelt: molten steel smelts process using LD-LF-RH, and LD converter smelting molten steel carries out silicomanganese aluminium deoxidation, controls furnace Dissolved oxygen content≤150ppm afterwards；LF refining makes white slag desulfurization, finishing slag basicity 2~4, oxidisability FeO+MnO≤1.5wt%, white Slag desulfurization retention time >=10min, LF terminal determine oxygen≤20ppm, S≤0.005wt%；It is white that most desulfurization is taken off after LF refining Slag, and secondary make high alkalinity low-sulfur slag；
(2) refine: oxygen, the holding pure degassing time >=8min of vacuum degree 100Pa or less are determined in thermometric, sampling after RH arrives at a station；Benefit With top blow oxygen lance into vacuum tank oxygen blowing in molten steel, determine oxygen be 10~100ppm when blow off, be added Ti deoxidation, and be added simultaneously Mg, One of Ca, Zr, REM are added in a manner of alloy block or line feeding, and argon blowing time >=5min after deoxidation makes in molten steel 5 μm or more The amount of inclusions≤120/mm3；Other alloying element contents are adjusted by steel plate component requirements, ingredient qualification molten steel is cast into company Slab；
(3) roll: continuous casting billet is heated to 1150~1260 DEG C, keeps the temperature 30~240min, using austenite recrystallization area and The rolling of Unhydrated cement two-stage control, rolls rear steel plate using water-spraying control, cooling velocity >=10 DEG C/s, and final cooling temperature 400~ 600℃。
The manufacturing method of the high-strength steel plate of resistance to Large Heat Input Welding, steel plate thickness are 20~60mm, and surrender is strong Degree be 500~700MPa, tensile strength be 600~800MPa, steel plate under 100~200kJ/cm weld heat input, base material and - 40 DEG C of heat affected area impact flexibility >=70J.
The manufacturing method of the high-strength steel plate of resistance to Large Heat Input Welding, it is preferred that steel plate is in 100~200kJ/cm Under weld heat input, -40 DEG C of 150~250J of impact flexibility of base material, -40 DEG C of heat affected area 100~200J of impact flexibility.
The manufacturing method of the high-strength steel plate of resistance to Large Heat Input Welding, steel plate carry out modifier treatment, Quench heating 900~950 DEG C of temperature, 20~40min is kept the temperature, steel plate quenching is cooled to 100 DEG C hereinafter, quenching cooling velocity >=15 DEG C/s, is returned 500~700 DEG C of fiery heating temperature, 30~90min of tempering time.
The manufacturing method of the high-strength steel plate of resistance to Large Heat Input Welding, it is preferred that pressed from both sides for 4 μm of size or more in steel plate 10~100/mm of sundries quantity3。
The manufacturing method of the high-strength steel plate of resistance to Large Heat Input Welding, it is preferred that having a size of 0.3~4 μ in steel plate In the field trash of m, the quantity of Ti-M-O complex inclusion accounts for 30~50%.
The manufacturing method of the high-strength steel plate of resistance to Large Heat Input Welding, it is preferred that Ti-M-O field trash averagely contains There are Ti10~30%, M 10~30%.
The manufacturing method of the high-strength steel plate of resistance to Large Heat Input Welding, it is preferred that in step (1), after controlling furnace Dissolved oxygen content refines slag oxidizing FeO+MnO≤1wt%, white slag desulfurization retention time 12~20min, LF in 10~50ppm Terminal determines 1~10ppm of oxygen, 0.001~0.004wt% of S.
The manufacturing method of the high-strength steel plate of resistance to Large Heat Input Welding, it is preferred that in step (2), keep vacuum Pure 10~the 15min of degassing time of 100Pa or less is spent, blow off when determine oxygen for 20~80ppm, 10~20min of argon blowing time after deoxidation, Make 5 μm or more the amount of inclusions, 10~100/mm in molten steel3。
The manufacturing method of the high-strength steel plate of resistance to Large Heat Input Welding, it is preferred that continuous casting billet is heated to 1180~ 1230 DEG C, keep the temperature 100~150min, 20~40 DEG C/s of cooling velocity, 500~550 DEG C of final cooling temperature.
Design philosophy of the invention is:
For 500~700MPa grade high-strength steel plate, the present invention program uses lower C, higher Mn to reduce in steel Carbide and high carbon martensite island, and guarantee the harden ability and obdurability of matrix；In conjunction with Large Heat Input Welding performance requirement, lead to The optimization that experimental study carries out alloying component is crossed, the combination of Nb, V, Cu, Ni, Mo, B element are selected, and controls most preferably containing respectively It measures in range, realizes that steel plate toughness and tenacity and the comprehensive of Large Heat Input Welding performance improve；It is micro to carry out Ti, Mg, N, O etc. simultaneously The control of element promotes the distribution of special composite oxides and fine TiN particle, obtains the HAZ microscopic structure of refinement, realizes big Heat input welding performance significantly improves.Another importance, general existing high input energy welding steel are mingled with using special Object improve welding performance when, it is difficult to while guarantee field trash fine even dispersion distribution, especially to steel purity requirements compared with High high strength steel causes properties of product and quality to decline.The present invention is directed to this problem, carries out special control to production technology System reduces harmful inclusion content, and beneficial inclusion fine dispersoid is promoted to be distributed simultaneously, improves product comprehensive performance.
The invention has the advantages and beneficial effects that:
1, the Special controlling of the invention by reasonable composition design and crucial smelting process for production, steel plate acquisition high intensity, High tenacity and resistance to Large Heat Input Welding comprehensive performance.The present invention program and deoxidization technique in conventional Large Heat Input Welding steel smelting Difference forms fine uniform specific type field trash, field trash by oxygen blast and deoxidation operation in LF refining, RH in steel Ingredient and distribution have the effect of more preferably promotion intragranular acicular ferrite forming core, be remarkably improved Large Heat Input Welding HAZ Low-temperature flexibility overcomes the deficiencies in the prior art.
2, the present invention can significantly reduce impurity element and harmful inclusion content in steel, with general high input energy welding steel It compares, the cleanliness of steel plate of the present invention significantly improves, and can get the Fine distribution of beneficial inclusion, improves large-line energy stablizing While welding performance, it is remarkably improved the comprehensive performance and product quality of steel plate.
3, technical solution of the present invention technique is clear, and significant effect, feasibility is strong, is conducive to promote and apply, can meet to height The urgent need of quality Large Heat Input Welding high-strength steel sheet.
Detailed description of the invention
Fig. 1-Fig. 2 is typical field trash pattern and ingredient power spectrum in embodiment 1, is Ti-Mg-O complex inclusion.Wherein, Fig. 1 is typical field trash pattern；Fig. 2 is ingredient power spectrum.
Fig. 3-Fig. 4 is typical field trash pattern and ingredient power spectrum in embodiment 3, is Ti-Zr-O complex inclusion.Wherein, Fig. 3 is typical field trash pattern；Fig. 4 is ingredient power spectrum.
Specific embodiment
In the following, being further elaborated on by embodiment and attached drawing to the present invention.
Embodiment 1
In the present embodiment, the manufacturing method for the high-strength steel plate of resistance to Large Heat Input Welding, steel plate chemical component presses quality hundred Score includes: C 0.1%, Si 0.2%, Mn 1.2%, Nb 0.015%, V 0.02%, Ti 0.01%, P 0.005%, S 0.001%, Cu 0.2%, Ni 0.2%, Mo 0.2%, B 0.0005%, N 0.001%, O 0.005%, Al 0.01%, Mg 0.001%, surplus Fe；4 μm of size or more the amount of inclusions, 100~150/mm in steel plate3；Having a size of 0.3 in steel plate In~4 μm of field trash, the quantity of Ti-Mg-O complex inclusion accounts for average as mass fraction in 12%, Ti-Mg-O field trash Contain Ti 10%, Mg 15%；
The method includes following processing steps: converter molten steel carries out silicomanganese aluminium deoxidation, and dissolved oxygen is 10ppm after furnace；LF Make white slag desulfurization, finishing slag basicity 2~4, FeO+MnO=0.6wt%, retention time 15min, LF terminal oxygen 5ppm, S≤ 0.005wt%；Most desulfurization white slag is taken off after LF refining, and secondary makes high alkalinity low-sulfur slag；RH keep vacuum degree 80Pa with Lower time 20min；Using top blow oxygen lance into vacuum tank oxygen blowing in molten steel, determine oxygen be 10ppm when blow off, with alloy block mode addition Ti and Mg deoxidation, Argon 5min, 5 μm or more the amount of inclusions, 80~120/mm in molten steel3；It is adjusted by steel plate component requirements Other alloying element contents such as Nb, V, Cu, Ni, ingredient qualification molten steel are cast into continuous casting billet；Continuous casting billet is heated to 1150 DEG C, heat preservation 200min is rolled using austenite recrystallization area and Unhydrated cement two-stage control, rolls rear steel plate using water-spraying control, cooling 15 DEG C/s of speed, 600 DEG C of final cooling temperature.
Produced steel plate thickness is 20mm, yield strength 520MPa, tensile strength 650MPa, -40 DEG C of impact flexibility 260J, under 100~200kJ/cm weld heat input, -40 DEG C of heat affected area 70~200J of impact flexibility.
Embodiment 2
In the present embodiment, the manufacturing method for the high-strength steel plate of resistance to Large Heat Input Welding, steel plate chemical component presses quality hundred Score includes: C 0.05%, Si 0.1%, Mn 1.0%, Nb 0.05%, V 0.05%, Ti 0.02%, P 0.001%, S 0.0008%, Cu 0.5%, Ni 0.5%, Mo 0.05%, B 0.001%, N 0.005%, O 0.001%, Al 0.001%, Ca 0.001%, surplus Fe；4 μm of size or more the amount of inclusions, 80~120/mm in steel plate3；Ruler in steel plate In the very little field trash for being 0.3~4 μm, the quantity of Ti-Ca-O complex inclusion is accounted in 20%, Ti-Ca-O field trash by quality point Number meter averagely contains Ti 20%, Ca 12%；
The method includes following processing steps: converter molten steel carries out silicomanganese aluminium deoxidation, and dissolved oxygen is 50ppm after furnace；LF Make white slag desulfurization, finishing slag basicity 2~4, FeO+MnO=0.7wt%, retention time 12min, LF terminal oxygen 9ppm, S≤ 0.005wt%；Most desulfurization white slag is taken off after LF refining, and secondary makes high alkalinity low-sulfur slag；RH keep vacuum degree 90Pa with Lower time 15min；Using top blow oxygen lance into vacuum tank oxygen blowing in molten steel, determine oxygen be 20ppm when blow off, Ti is added in a manner of line feeding With Ca deoxidation, Argon 10min makes 5 μm or more the amount of inclusions, 70~100/mm in molten steel3；It is adjusted by steel plate component requirements Other alloying element contents such as Nb, V, Cu, Ni, ingredient qualification molten steel are cast into continuous casting billet；Continuous casting billet is heated to 1250 DEG C, heat preservation 100min is rolled using austenite recrystallization area and Unhydrated cement two-stage control, rolls rear steel plate using water-spraying control, cooling 10 DEG C/s of speed, 650 DEG C of final cooling temperature.Steel plate carries out modifier treatment, 910 DEG C of quenching temperature, keeps the temperature 30min, steel plate is quenched Fire be cooled to 100 DEG C hereinafter, quenching 18 DEG C/s of cooling velocity, 550 DEG C of tempering heating-up temperature, tempering time 40min.
Produced steel plate thickness is 40mm, yield strength 680MPa, tensile strength 750MPa, -40 DEG C of impact flexibility 210J, under 100~200kJ/cm weld heat input, -40 DEG C of heat affected area 70~200J of impact flexibility.
Embodiment 3
In the present embodiment, the manufacturing method for the high-strength steel plate of resistance to Large Heat Input Welding, steel plate chemical component presses quality hundred Score includes: C 0.06%, Si 0.15%, Mn 1.6%, Nb 0.04%, V 0.03%, Ti 0.025%, P 0.006%, S 0.003%, Cu 0.2%, Ni 0.3%, Mo 0.4%, B 0.002%, N 0.002%, O 0.003%, Al 0.015%, Zr 0.01%, surplus Fe；4 μm of size or more the amount of inclusions, 50~100/mm in steel plate3；Ruler in steel plate In the very little field trash for being 0.3~4 μm, the quantity of Ti-Zr-O complex inclusion is accounted in 50%, Ti-M-O complex inclusion by quality Score meter averagely contains Ti 15%, Zr 10%.
The method includes following processing steps: converter molten steel carries out silicomanganese aluminium deoxidation, and dissolved oxygen is 100ppm after furnace；LF Make white slag desulfurization, finishing slag basicity 2~4, FeO+MnO=0.8wt%, retention time 20min, LF terminal oxygen 8ppm, S≤ 0.005wt%；Most desulfurization white slag is taken off after LF refining, and secondary makes high alkalinity low-sulfur slag；RH keep vacuum degree 70Pa with Lower time 18min；Using top blow oxygen lance into vacuum tank oxygen blowing in molten steel, determine oxygen be 50ppm when blow off, with alloy block mode addition Ti and Zr deoxidation, Argon 15min make 5 μm or more the amount of inclusions, 50~80/mm in molten steel3；It is adjusted by steel plate component requirements Other alloying element contents such as Nb, V, Cu, Ni, ingredient qualification molten steel are cast into continuous casting billet；Continuous casting billet is heated to 1200 DEG C, heat preservation 120min is rolled using austenite recrystallization area and Unhydrated cement two-stage control, rolls rear steel plate using water-spraying control, cooling 18 DEG C/s of speed, 550 DEG C of final cooling temperature.
Produced steel plate thickness is 30mm, yield strength 580MPa, tensile strength 690MPa, -40 DEG C of impact flexibility 200J, under 100~200kJ/cm weld heat input, -40 DEG C of heat affected area 70~200J of impact flexibility.
Embodiment 4
In the present embodiment, the manufacturing method for the high-strength steel plate of resistance to Large Heat Input Welding, steel plate chemical component presses quality hundred Score includes: C 0.08%, Si 0.25%, Mn 1.15%, Nb 0.01%, V 0.015%, Ti 0.015%, P 0.007%, S 0.004%, Cu 0.3%, Ni 0.4%, Mo 0.1%, B 0.0025%, N 0.004%, O 0.004%, Al 0.007%, REM (rare earth element) 0.01%, surplus Fe；4 μm of size or more the amount of inclusions 10~30 in steel plate/ mm3；Having a size of in 0.3~4 μm of field trash in steel plate, the quantity of Ti-REM-O complex inclusion accounts for 38%, Ti-REM-O folder Averagely contain Ti 18%, REM 30% in sundries as mass fraction；
The method includes following processing steps: converter molten steel carries out silicomanganese aluminium deoxidation, and dissolved oxygen is 100ppm after furnace；LF Make white slag desulfurization, finishing slag basicity 2~4, FeO+MnO=0.9wt%, retention time 18min, LF terminal oxygen 7ppm, S≤ 0.005wt%；Most desulfurization white slag is taken off after LF refining, and secondary makes high alkalinity low-sulfur slag；RH keep vacuum degree 60Pa with Lower time 12min；Using top blow oxygen lance into vacuum tank oxygen blowing in molten steel, determine oxygen be 100ppm when blow off, be added in a manner of line feeding Ti and REM deoxidation is added, Argon 20min makes 5 μm or more the amount of inclusions, 5~30/mm in molten steel3；By steel plate component requirements Other alloying element contents, the ingredient qualification molten steel such as adjustment Nb, V, Cu, Ni are cast into continuous casting billet；Continuous casting billet is heated to 1200 DEG C, 60min is kept the temperature, is rolled using austenite recrystallization area and Unhydrated cement two-stage control, rear steel plate is rolled and uses water-spraying control, 10 DEG C/s of cooling velocity, 500 DEG C of final cooling temperature.
Produced steel plate thickness is 60mm, yield strength 525MPa, tensile strength 650MPa, -40 DEG C of impact flexibility 205J, under 100~200kJ/cm weld heat input, -40 DEG C of heat affected area 70~200J of impact flexibility.
As Figure 1-Figure 2, the typical field trash in embodiment 1 is Ti-Mg-O complex inclusion.As Figure 3-Figure 4, Typical field trash in embodiment 3 is Ti-Zr-O complex inclusion.As can be seen that using the method for the invention, it is easy in steel It is middle to be formed having a size of 0.3~4 μm of Ti-M-O complex inclusion, be conducive to steel plate toughness and tenacity and Large Heat Input Welding performance It is comprehensive to improve.
Embodiment the result shows that, steel plate yield strength of the present invention reaches 500~700MPa, 100~200kJ/cm weld There is good low-temperature impact toughness under heat input.

Claims (10)

1. a kind of manufacturing method for the high-strength steel plate of resistance to Large Heat Input Welding, it is characterised in that: by mass percentage, steel plate Chemical component includes: C 0.04~0.10%, Si 0.1~0.3%, Mn 1.0~1.8%, Nb 0.01~0.05%, V 0.01~0.05%, Ti 0.005~0.025%, P 0.001~0.008%, S 0.0005~0.005%, Cu 0.1~ 0.5%, Ni 0.1~0.5%, Mo 0.05~0.5%, B 0.0005~0.0025%, N 0.001~0.005%, O 0.001~0.005%, Al 0.001~0.015% and Mg 0.0005~0.005%, Ca 0.0005~0.005%, Zr 0.001~0.025%, one of REM 0.001~0.025%, surplus Fe；4 μm of size or more field trash numbers in steel plate Measure≤150/mm3；Having a size of in 0.3~4 μm of field trash in steel plate, the quantity of Ti-M-O complex inclusion account for 10% with On, and Ti-M-O field trash averagely contains Ti 1~50%, M 1~50%, and wherein M is one of Mg, Ca, Zr, REM；
The method includes following processing steps:
(1) smelt: molten steel using LD-LF-RH smelt process, LD converter smelting molten steel carry out silicomanganese aluminium deoxidation, control furnace after it is molten Solve oxygen content≤150ppm；LF refining makes white slag desulfurization, finishing slag basicity 2~4, oxidisability FeO+MnO≤1.5wt%, and white slag is de- Sulphur retention time >=10min, LF terminal determine oxygen≤20ppm, S≤0.005wt%；Most desulfurization white slag is taken off after LF refining, and It is secondary to make high alkalinity low-sulfur slag；
(2) refine: oxygen, the holding pure degassing time >=8min of vacuum degree 100Pa or less are determined in thermometric, sampling after RH arrives at a station；Utilize top Oxygen-blowing gun oxygen blowing in molten steel into vacuum tank, determine oxygen be 10~100ppm when blow off, be added Ti deoxidation, and be added simultaneously Mg, Ca, One of Zr, REM are added in a manner of alloy block or line feeding, argon blowing time >=5min after deoxidation, make to press from both sides for 5 μm or more in molten steel Sundries quantity≤120/mm3；Other alloying element contents are adjusted by steel plate component requirements, ingredient qualification molten steel is cast into continuous casting Base；
(3) roll: continuous casting billet is heated to 1150~1260 DEG C, keeps the temperature 30~240min, using austenite recrystallization area and not again Two-stage control rolling in crystal region rolls rear steel plate using water-spraying control, cooling velocity >=10 DEG C/s, final cooling temperature 400~600 ℃。
2. the manufacturing method of the high-strength steel plate of resistance to Large Heat Input Welding according to claim 1, which is characterized in that steel plate With a thickness of 20~60mm, yield strength is 500~700MPa, and tensile strength is 600~800MPa, and steel plate is in 100~200kJ/ Under cm weld heat input, base material and -40 DEG C of heat affected area impact flexibility >=70J.
3. the manufacturing method of the high-strength steel plate of resistance to Large Heat Input Welding according to claim 2, which is characterized in that preferably , steel plate is under 100~200kJ/cm weld heat input, -40 DEG C of 150~250J of impact flexibility of base material, the punching of -40 DEG C of heat affected area Hit 100~200J of toughness.
4. the manufacturing method of the high-strength steel plate of resistance to Large Heat Input Welding according to claim 1, which is characterized in that steel plate Modifier treatment is carried out, 900~950 DEG C of quenching temperature, keeps the temperature 20~40min, steel plate quenching is cooled to 100 DEG C hereinafter, quenching Fiery cooling velocity >=15 DEG C/s, 500~700 DEG C of tempering heating-up temperature, 30~90min of tempering time.
5. the manufacturing method of the high-strength steel plate of resistance to Large Heat Input Welding according to claim 1, which is characterized in that preferably , 4 μm of size or more the amount of inclusions, 10~100/mm in steel plate3。
6. the manufacturing method of the high-strength steel plate of resistance to Large Heat Input Welding according to claim 1, which is characterized in that preferably , having a size of in 0.3~4 μm of field trash in steel plate, the quantity of Ti-M-O complex inclusion accounts for 30~50%.
7. the manufacturing method of the high-strength steel plate of resistance to Large Heat Input Welding according to claim 1, which is characterized in that preferably , Ti-M-O field trash averagely contains Ti 10~30%, M 10~30%.
8. the manufacturing method of the high-strength steel plate of resistance to Large Heat Input Welding according to claim 1, which is characterized in that preferably , in step (1), dissolved oxygen content refines slag oxidizing FeO+MnO≤1wt%, white slag is de- in 10~50ppm after controlling furnace Sulphur retention time 12~20min, LF terminal determines 1~10ppm of oxygen, 0.001~0.004wt% of S.
9. the manufacturing method of the high-strength steel plate of resistance to Large Heat Input Welding according to claim 1, which is characterized in that preferably , in step (2), the pure 10~15min of degassing time of vacuum degree 100Pa or less is kept, blow off when oxygen is 20~80ppm is determined, takes off 10~20min of argon blowing time after oxygen makes 5 μm or more the amount of inclusions, 10~100/mm in molten steel3。
10. the manufacturing method of the high-strength steel plate of resistance to Large Heat Input Welding according to claim 1, which is characterized in that excellent Choosing, continuous casting billet is heated to 1180~1230 DEG C, keeps the temperature 100~150min, 20~40 DEG C/s of cooling velocity, final cooling temperature 500 ~550 DEG C.
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CN112139242A (en) * 2020-08-24 2020-12-29 龙岩学院 Steel for large heat input welding and method for improving toughness of heat affected zone of steel
CN112267005A (en) * 2020-09-23 2021-01-26 舞阳钢铁有限责任公司 Steel-making method for welding steel plate with large heat input
CN114150226A (en) * 2021-12-06 2022-03-08 东北大学 Large heat input welding resistant steel plate and production method thereof
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CN102080193A (en) * 2011-01-10 2011-06-01 东北大学 Structural steel for welding with ultra-great heat input and manufacturing method thereof
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CN111519098A (en) * 2020-05-12 2020-08-11 首钢集团有限公司 Low-carbon steel and deoxidation method for controlling inclusions in low-carbon steel
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CN112139242A (en) * 2020-08-24 2020-12-29 龙岩学院 Steel for large heat input welding and method for improving toughness of heat affected zone of steel
CN112139242B (en) * 2020-08-24 2022-07-08 龙岩学院 Steel for large heat input welding and method for improving toughness of heat affected zone of steel
CN112267005A (en) * 2020-09-23 2021-01-26 舞阳钢铁有限责任公司 Steel-making method for welding steel plate with large heat input
CN114807491A (en) * 2021-01-28 2022-07-29 上海梅山钢铁股份有限公司 Production method of ultralow-oxygen and sulfide high-spheroidization-rate medium-low-carbon steel molten steel
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CN114150226A (en) * 2021-12-06 2022-03-08 东北大学 Large heat input welding resistant steel plate and production method thereof
CN114150226B (en) * 2021-12-06 2022-09-09 东北大学 Large heat input welding resistant steel plate and production method thereof
CN115011863A (en) * 2022-07-12 2022-09-06 攀钢集团攀枝花钢铁研究院有限公司 Control method for A-type inclusions of rail steel

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