CN106756498B - A method of adding magnesium in high input energy welding steel - Google Patents

A method of adding magnesium in high input energy welding steel Download PDF

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CN106756498B
CN106756498B CN201611193384.9A CN201611193384A CN106756498B CN 106756498 B CN106756498 B CN 106756498B CN 201611193384 A CN201611193384 A CN 201611193384A CN 106756498 B CN106756498 B CN 106756498B
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steel
alloy
magnesium
tundish
mass
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CN106756498A (en
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倪冰
曾加庆
贺庆
姚同路
赵军普
王乐
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Central Iron and Steel Research Institute
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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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • 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
    • B22D11/108—Feeding additives, powders, or the like
    • 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
    • C21C7/0006—Adding metallic additives
    • 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
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • 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
    • C21C7/0068—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by introducing material into a current of streaming metal
    • 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
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • 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
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Multimedia (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

A method of it adding magnesium in high input energy welding steel, belongs to welding steel technical field.Feed Mg Si Fe B alloy wires before continuous casting in tundish or in crystallizer respectively, it is 10 50% that the Mg Si Fe alloy mass in the B alloy wire, which accounts for Mg Si Fe alloy mass and the percentage of crust quality sum,.Mg mass percents in the Mg Si Fe alloys are 10 45%, and Si mass percents are 10 50%, and surplus is Fe and inevitable impurity.Mg Si Fe in the B alloy wire are the alloying pellet that high-temperature chemical reaction generates, and granularity is 0 3mm.The additions of the Mg Si Fe B alloy wires needs and the steel transportation amount of tundish or crystallizer matches, and the Mg of B alloy wire and the mass percent of steel are 0.0005% 0.005%.The Mg Si Fe B alloy wires are 15 60m/min in the feeding speed of tundish, and the feeding speed in crystallizer is 15 90m/min.The advantage is that magnesium recovery rate is high, production cost is low, and operating procedure is simple.

Description

A method of adding magnesium in high input energy welding steel
Technical field
The invention belongs to welding steel technical field, in particular, provides and a kind of adding magnesium in high input energy welding steel Method adds the composite core-spun yarn of magnesium into steel, a large amount of, tiny magnesium titanium combined oxidation is obtained in high input energy welding steel Object, to improve steel Large Heat Input Welding.
Background technology
High input energy welding steel is to be unlikely to cause to weld using the weld heat input more much higher than general welding condition Connect the steel that area's toughness significantly reduces, will not generate weld crack.Weld heat input of the previous steel in welding procedure >= 50kJ/cm can be referred to as Large Heat Input Welding, and actual welding energy is even as high as 500kJ/cm or more at present.Such as in shipbuilding Field, it is desirable that construction efficiency improved using the method for welding fabrication to 16~35mm steel plates, when a welding fabrication Heat input be 100~200kJ/cm.
It is original in welding heat affected zone when heat input is more than 50kJ/cm but in conventional low alloy steels welding process Austenite grain size is significantly grown up, and is organized as coarse pro-eutectoid ferrite and ferrite side plate tissue, low-temperature flexibility It significantly reduces.Conventional method combines original N in molten steel using micro- Ti processing, by forming a large amount of disperses point in process of setting The TiN particles of cloth, can improve the Large Heat Input Welding of steel.But after N content increase, second other than TiN particles Phase particle size significantly increases, and the increase of N influences the technology stability of continuous casting billet.It can be seen that this technology for forming TiN It is difficult to meet the low-temperature flexibility requirement of welding heat affected zone when welding compared with large-line energy (100~200kJ/cm).
There is the ability for promoting intragranular acicular ferrite forming core using the composite oxides of Ti and Ti, by refining original indirectly The mode of beginning austenite grain size can obtain the low-temperature flexibility in higher welding heat affected zone.But the oxide of Ti is It is formed in molten steel, is easy to float and grow up, tiny Ti oxides and composite oxides containing Ti how are obtained in steel to be become The key of Ti Oxides Metallurgy Technologies.Micro Mg is added in Ti handles steel and forms a large amount of Mg-Ti-O composite oxides and sulphur Compound particle can significantly refine oxide size, the stability under the dispersibility and welding high temperature that are provided simultaneously in steel Both characteristics improve oxide and promote Intragranular Acicular Ferrite nucleation ability, inhibit growing up for austenite grain.But it is how compound It is technological difficulties that addition magnesium titanium, which especially adds magnesium,.
In the method for compound addition magnesium titanium, European patent " has superior low-temperature tenacity, low-alloy when Large Heat Input Welding High-strength steel " (publication number：EP1052303A2) describe can be obtained in testing steel using method compound Ti-Mg it is tiny Oxide particle, but the test method is only applicable to the smelting of laboratory vacuum smelting furnace.A kind of Chinese patent " large-line energy weldering Connect with the method for compound addition magnesium titanium in steel " it describes and feeds Mg-Y-Ni B alloy wires and Ti B alloy wires, Mg respectively in tundish Recovery rate be 8-15%, 90% or more the recovery rate of Ti, it is seen that the recovery rate of Mg is relatively low.The patent does not point out alloy Silk Mg, Y, Ni are that chemical method is formed or physics state mixes, and according to thermodynamics of alloys, Mg, Y and Ni will not be formed Ternary alloy three-partalloy, therefore three or the two therein are added with physical form.
Due to the opposite inertness of titanium, the recovery rate after titanium addition molten steel can be in 80%-90% or more, therefore is inclined to In keeping Ti content certain in molten steel in advance, magnesium is added before solidification and enters molten steel.How Mg content in steel is ensured, such as What improves the recovery rate of addition Mg, and so that Mg is uniformly distributed in steel as steel plate Large Heat Input Welding is improved The key of energy.Since the boiling point of metal Mg is 1107 DEG C, at a temperature of making steel 1600 DEG C, vapour pressure is up to 2.0 × 106Pa.The metal Mg added into molten steel will quickly become steam, be escaped from molten steel, or even cause molten steel splash, explosion Equal danger.Therefore, the safety problem of addition metal Mg and the utilization rate problem of metal Mg processing molten steel are still in molten steel Restrict the main bugbear that metal Mg is used for steel secondary refining.
In the method for addition magnesium, Chinese patent " method that magnesium can be added in process of manufacturing large heat input welding steel plates " (publication number：It 101724774A) describes through stabilization in obtaining steel in the method for the uniform place mat NiMg alloys of cast base Mg, this method Mg recovery rate 6-19% are suitable for the smelting of small dimension vacuum smelting furnace." a kind of steel-making is de- with molten steel for Chinese patent Oxygen agent and its device, method " (application number：CN101020942A it) describes one kind and containing Mg alloy wire, which is mainly used for steel Deoxidation of molten steel in packet, it is difficult to improve the Large Heat Input Welding of steel.Mg recovery rates are low to show that the when of adding magnesium splashes strongly, and operation is not Safety, it is difficult to realize commercial Application in tundish or crystallizer.
It is most of using containing Mg and the alloy containing Al as the method that molten-steel deoxidation agent adds Mg.Although these alloys Addition can obtain higher magnalium recovery rate, but these methods only only account for the demand of deoxidation of molten steel, do not account for carrying The requirement of high high heat input welding performance of thick steel plates.It adds and contains a large amount of metallic aluminium in alloy, be easy to shape in deoxidation process At tufted large size Al2O3Field trash, to which growing up for γ crystal grain cannot be effectively inhibited, it is difficult to improve the large-line energy of steel plate Welding performance.As Chinese patent application " a kind of molten steel deoxygenating agent and preparation method thereof " (200710013788.X) is introduced It uses and adds magnesium metal and lanthanum, cerium mischmetal alloy in the ferrous alloy containing aluminium as molten-steel deoxidation agent, constituent content is：8- 12wt% magnesium, 0.03-1wt% rare earth alloys, the iron of 48-58% aluminium and aequum.Chinese patent " is used for deoxidation in steel making and desulfurization Almag " (01109969.0), Chinese patent " a kind of method of agent for purifying molten steel and cleaning molten steel " (01121537.2), All it is added to the element aluminum for being easy to promote field trash agglomeration, it is difficult to improve the Large Heat Input Welding performance of steel.
As the alloy for being free of aluminium again containing Mg that molten-steel deoxidation agent uses, there is Chinese patent " to be used for the silicon of deoxidizer in steel production Barium strontium calcium and magnesium ferroalloy " (03133370.2), Chinese patent " SiBaCaBMg ferroalloy and preparation method thereof " (03126163.9), Chinese patent " rare earth silicon and magnesium calcium rare earth iron alloy and preparation method thereof " (03126165.5) etc..These The preparation method for focusing on alloy of patent, alloying component is excessively complicated, will be inevitably thick with Large Heat Input Welding The composition design of the alloying element of steel plate mutually conflicts, and cannot meet the requirement of the deoxidization technique of high input energy welding steel.
Also have the alloy containing Mg used as molten steel preparation agent, have Chinese patent " the core agent of high Mg alloy cored wine and The manufacture craft of core wire " (CN1255568), Chinese patent " manufacturing process of efficient high Mg alloy cored wine " (CN1580308), Chinese patent " manufacturing process of high silicon-magnesium-ratio alloy nodularization core-spun yarn " (CN1580307) etc..These patents highlight cored The manufacture craft of line, the alloying component as content is relative complex, and emphasis is meeting molten steel preparation and nodularization Metamorphism treatment, nothing The deoxidization technique of method and high input energy welding steel matches.For this reason, it may be necessary to design the oligomict magnesium alloy of letter, magnesium both can guarantee Efficiently use, and Large Heat Input Welding performance cannot be adversely affected.
Therefore, the prior art can not effectively solve the method for effectively adding magnesium in high input energy welding steel, in steel It is middle to obtain a large amount of tiny composite magnesium titanium oxide particles.
Invention content
The method that the purpose of the present invention is to provide a kind of to add magnesium in high input energy welding steel, decreases or even eliminates Splash improves the recovery rate of magnesium, a large amount of tiny magnesium titanium composite oxides is obtained, to improve the Large Heat Input Welding of steel. Technique is as follows:
Mg-Si-Fe B alloy wires are fed before continuous casting in tundish or crystallizer, for steady in high input energy welding steel Surely tiny magnesium titanium composite oxide particle is obtained, splash is decreased or even eliminated, improves the recovery rate of magnesium, is obtained a large amount of tiny Magnesium titanium composite oxide, to improve the Large Heat Input Welding of steel..Mg-Si-Fe alloy mass in the B alloy wire accounts for The percentage of Mg-Si-Fe alloy mass and crust quality sum is 10-50%.Mg mass hundred in the Mg-Si-Fe alloys Score is 10-45%, and Si mass percents are 10-50%, and surplus is Fe and inevitable impurity.In the B alloy wire Mg-Si-Fe is the alloying pellet that high-temperature chemical reaction generates, and granularity is less than 3mm.
The addition of the Mg-Si-Fe B alloy wires needs and the steel transportation amount of tundish or crystallizer matches, and specially closes The mass percent of Mg and steel in spun gold are 0.0005%-0.005%.
The Mg-Si-Fe B alloy wires are 15-60m/min, the feeding speed in crystallizer in the feeding speed of tundish For 15-90m/min.
The adding method of magnesium in the present invention is illustrated, only indicates the mass percent in composition with % below.
Since oxygen combining power is more than titanium and oxygen combining power in magnesium and molten steel, it is added after magnesium and preferentially combines with oxygen and form MgO.With Titanium in the molten steel forming core on tiny magnesium oxide again afterwards, to form a large amount of tiny magnesium titanium composite oxide particles.But Magnesium adds in molten steel easily occurs evaporation loss and oxidational losses, adds premature loss magnesias that are more, and having been formed Object is easy to grow up and float, and can not form composite magnesium titanium oxide particle with titanium.In order to improve the recovery rate of magnesium and the peace of operation Quan Xing, the present invention uses the method for feeding Mg-Si-Fe B alloy wires in tundish or crystallizer to add magnesium, to improve in molten steel Mg concentration, to be easy to form magnesium titanium composite oxide particle in molten steel.Mg-Si-Fe is fed in tundish or crystallizer to close Spun gold the advantages of be that of avoiding in refining process to be added to fall into a long wait and easily cause oxide floating, Mg is easy to lose in steel The shortcomings of, magnesium titanium composite oxide has just been formed in tundish or crystallizer can enter the process of setting of steel so that multiple Oxide is closed to be retained in solid-state steel billet.
Since strong oxidation reaction occurs for oxygen in magnesium and molten steel, it is also easy to produce safety problem.Therefore, Mg-Si- in the present invention Fe B alloy wires are fed separately into tundish or crystallizer, can decrease or even eliminate expulsion problem.,
The Mg-Si-Fe B alloy wire composition design reasons provided in the method for the present invention are as follows：
It is advantageous that magnesium is added to composite oxides, the magnesium such as oxide and the magnesium titanium that can promote that magnesium is formed in molten steel in B alloy wire In refining composite oxides in steel and other types of oxide is mingled with.The alloy mass in B alloy wire is usually accounted for alloy The percentage of quality and crust quality sum is known as filling rate.When filling rate is less than 10%, magnesium content is too low, it is difficult to play refinement The effect of oxide.It is easy to form the oxide of a large amount of larger-size Mg, Wu Fati when filling rate is more than 50%, in molten steel The weldability of Gao Gang.Meanwhile filling rate is excessively high is difficult to effectively wrap up powder, is easy leakage powder.In addition, in operation, filling The excessively high rapid evaporation for easily causing magnesium of rate generates the safety problems such as molten steel splash.The Mg-Si-Fe provided in the method for the present invention is closed It is 10~50% that filling rate is controlled in spun gold.
Magnesium metal is active element, and boiling point is 1107 DEG C, since molten steel temperature is higher in steelmaking process, steam Pressure up to 2.0 × 106Pa.Therefore no matter elemental magnesium is added molten steel in the form of magnesium powder or magnesium silk, even few amount, all It will produce serious expulsion events.And the magnesium of compound state reduces the activity of magnesium, promotes dissolubility of the magnesium in molten steel, reduces The generation of magnesium bubble, therefore, the Mg-Si-Fe provided in the method for the present invention are to pass through high temperature in special alloy smelting furnace The alloy block for chemically reacting production, obtains the suitable particle size of 0-3mm, the content as core-spun yarn after granulation.In alloy When Mg mass percents are less than 10%, it is difficult to play the role of refining oxide；When more than 45%, larger-size Mg is easily formed Oxide, while easily causing the expulsion events of magnesium.Therefore Mg mass hundred in the Mg-Si-Fe alloys provided in the method for the present invention Fractional domination is 10~50%.
Mg-Si-Fe in the B alloy wire is the alloying pellet generated, and Si mass percents are 10-50%, and surplus is Fe.Silicon is another key component that the present invention provides B alloy wire.Steam of the vapour pressure of pure magnesium than alloys magnesium (Si-Mg phases) Press much bigger, in the case of identical content of magnesium, the severity of pure magnesium core-spun yarn reaction is more much bigger than alloys magnesium.In addition, Silicon can not only increase the intensity and toughness of steel, can also improve the welding performance of steel, be high input energy welding steel weight The alloying element wanted.So on the basis of silicon increment influences in considering addition Mg-Si-Fe alloys on steel, closed by controlling The additive amount of elemental silicon when aurification can meet content requirement of the high input energy welding steel to element silicon.It is obtained greatly to stablize Amount, tiny magnesium titanium composite oxide, silicone content it is minimum meet 10% when can play reduce magnesium and molten steel the extent of reaction, but It is that will form a large amount of C type oxides when silicone content is more than 50% to be mingled with, fine oxide in molten steel is formed to can not achieve Purpose.The content that control silicon in Mg-Si-Fe alloys is provided in the method for the present invention is 10-50%.
It is needed the present invention claims the addition when B alloy wire is added and the steel transportation amount of tundish or crystallizer matches, closed The mass percent of Mg and steel in spun gold are 0.0005%-0.005%.In steel mill, by the large-line energy of double refining Before the molten steel of welding steel wraps in entering, the content of free oxygen [O] can be controlled in 10-50ppm ranges.B alloy wire is fed into steel In liquid, magnesium can dissolve to form dissolving magnesium, some can form magnesia, and other part can form magnesium bubble and generate centainly Molten steel splash.If the mass percent of Mg and steel is less than 0.0005%, dissolving magnesium is very few, it is difficult to which satisfaction forms tiny be mingled with The high input energy welding steel requirement of object.If the mass percent of Mg and steel is more than 0.005%, magnesium elements are formed many big In 5 μm of field trash, and recovery rate is low, and molten steel is also easy to produce splash, causes unnecessary waste and security risk.Therefore, this hair The mass percent of the bright Mg required in B alloy wire and steel is 0.0005%-0.005%.
Mg-Si-Fe B alloy wires, which are fed into molten steel, can occur oxide reaction, while will produce certain molten steel splash. When tundish feeding speed is less than 15m/min, the content of magnesium met the requirements can not be obtained.When feeding speed is more than 15m/min, The inertia that B alloy wire can be utilized downward brings magnesium bubble into deep inside, to improve magnesium recovery rate toward dirty molten steel.But When feeding speed is more than 60m/min, the reaction of magnesium elements is more notable, generates more strong molten steel splash, recovery rate is instead It reduces.Therefore, it is 15-60m/min that the present invention, which controls Mg-Si-Fe B alloy wires in the feeding speed of tundish,.As a same reason, it controls Feeding speed of the alloyage silk in crystallizer is 15-90m/min.Control feeding speed the upper limit be 90m/min, be because Can be bigger than the speed in tundish toward dirty molten steel speed in crystallizer, it can preferably utilize dirty stock by magnesium bubble band Enter wick-containing depths, to improve magnesium recovery rate.
The present invention has the following advantages：
1. magnesium is added in high input energy welding steel production process according to the method for the present invention, in initial Ti content 0.005- In the case of 0.020%, the content of magnesium that 5-30ppm is obtained in molten steel can be stablized.
2. the method for the present invention manufactures high input energy welding steel, 0.5~3 μm of a large amount of particle size ranges can be obtained in steel Tiny magnesium titanium composite oxide particle.
3. the present invention also has many advantages, such as that magnesium recovery rate is high, production cost is low, operating procedure is simple.
Description of the drawings
Fig. 1 is that schematic diagram is added in tundish in Mg-Si-Fe B alloy wires.Wherein, feeding in the tundish 2 below ladle 1 Mg-Si-Fe B alloy wires 3, or the feeding Mg-Si-Fe B alloy wires 3 in crystallizer 4.Tundish 2 or in crystallizer 4 not With line feeding simultaneously, a kind of mode is selected to feed according to actual conditions.
Specific implementation mode
The present invention will be described by the comparison of different embodiment and comparative examples below.These embodiments are only used for explaining Purpose, during the present invention is not limited to these Examples.
Embodiment 1
Embodiment carries out in 500kg intermediate frequency furnaces.300kg pure iron is added in induction furnace, after furnace charge is melting down, The slag making by the way of adding CaO ensure that lower oxygen position in slag.It is blown into the argon gas that purity is 99.99% simultaneously, keeps Molten steel is avoided by air oxidation.The alloy containing elements such as C, Si, Mn, Ti is added, the alloying component in molten steel is adjusted.Sampling is simultaneously On-line analysis alloying component makes the total oxygen content in molten steel be reduced to 30ppm while ensureing alloying component.The Mg- of feeding Si-Fe alloy wires, alloy granularity are to contain Mg29%, Si35% less than 3mm, and surplus is Fe and inevitable impurity.B alloy wire In Mg be 9g and the mass percent of steel be 0.003%.Feeding speed 18m/min, takes respectively in an ar atmosphere after feeding The 1# steel sample and 2# steel samples of 500g removes outside stove after the solidification of steel sample, is cooled to room temperature.Fritter sample is taken on steel sample central cross-section, Chemical composition spectrum analysis is carried out, the result is shown in tables 1.As can be seen that the addition of metal Mg and homogenization of composition can be complete simultaneously At the recovery rate (η of metal MgMg) it is respectively 66.7% and 60.0%.
The chemical composition of each element in 1 embodiment steel of table, surplus Fe (being mass percent, %)
Sample number C Si Mn P S Ti Mg ηMg
1# 0.163 0.398 1.335 0.016 0.0096 0.009 0.0020 66.7
2# 0.162 0.374 1.323 0.015 0.0083 0.010 0.0018 60.0
Embodiment 2
Embodiment carries out in 100 tons of industrial converters, and technique distance is fed using converter smelting+double refining+tundish Silk+continuous casting.It is 32ppm, slab pulling rate 1.5m/min, tundish that free oxygen [O] content in molten steel is measured after 1# steel double refinings The feeding speed of Mg-Si-Fe B alloy wires is 30m/min when feeding silk；The free oxygen of molten steel [O] content is measured after 2# steel double refinings is 35ppm, the feeding speed of Mg-Si-Fe B alloy wires is 36m/min when crystallizer feeds silk.In 1/4 passing through of position of continuous casting billet width The method of credit analysis measures the chemical composition of each element, is shown in Table 2.The results show that embodiment steel obtains under the conditions of 2 kinds The recovery rate of the content of magnesium that 20-22ppm stablizes, magnesium is 55.5% and 53.8%.
The chemical composition of each element in 2 embodiment steel of table, surplus Fe (being mass percent, %)
Sample number C Si Mn P S Ti Mg ηMg
1# 0.154 0.157 1.296 0.012 0.0057 0.012 0.0022 55.5
2# 0.177 0.168 1.318 0.013 0.0052 0.013 0.0020 53.8

Claims (1)

1. a kind of method for adding magnesium in high input energy welding steel, it is characterised in that：In tundish or crystallization before continuous casting Mg-Si-Fe B alloy wires are fed in device, the Mg-Si-Fe alloy mass in the B alloy wire account for Mg-Si-Fe alloy mass with it is outer The percentage of skin quality sum is 10-50%；Mg mass percents in the Mg-Si-Fe alloys are 10-45%, Si matter Amount percentage is 10-50%, and surplus is Fe and inevitable impurity；Mg-Si-Fe in the B alloy wire is that high temeperature chemistry is anti- The alloying pellet that should be generated, granularity are less than 3mm；
The addition of the Mg-Si-Fe B alloy wires needs and the steel transportation amount of tundish or crystallizer matches, the Mg in B alloy wire Mass percent with steel is 0.0005%-0.005%；
The Mg-Si-Fe B alloy wires are 15-60m/min in the feeding speed of tundish, and the feeding speed in crystallizer is 15-90m/min。
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CN112122567B (en) * 2020-09-07 2021-07-09 东北大学 Method for improving solidification quality of casting blank by feeding stainless steel ladle core wire into crystallizer
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