CN107338341A - A kind of solid calcium metal, ferrosilicon and containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloyed powder composite core-spun yarn of boron - Google Patents

A kind of solid calcium metal, ferrosilicon and containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloyed powder composite core-spun yarn of boron Download PDF

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CN107338341A
CN107338341A CN201611017061.4A CN201611017061A CN107338341A CN 107338341 A CN107338341 A CN 107338341A CN 201611017061 A CN201611017061 A CN 201611017061A CN 107338341 A CN107338341 A CN 107338341A
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titanium
silicon nitride
layer
ferrosilicon
rare earth
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凌春源
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ZHEJIANG BAOXIN NEW FURNACE TECHNOLOGY DEVELOPMENT Co Ltd
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ZHEJIANG BAOXIN NEW FURNACE TECHNOLOGY DEVELOPMENT Co Ltd
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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
    • C21C7/0006—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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • 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
    • C21C7/064—Dephosphorising; Desulfurising
    • C21C7/0645—Agents used for dephosphorising or desulfurising
    • 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
    • C21C2007/0018—Boron

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

Abstract

The present invention relates to a kind of alloy claded wire.A kind of solid calcium metal, ferrosilicon and containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloyed powder composite core-spun yarn of boron, the core-spun yarn includes sandwich layer and the sheetmetal layer being wrapped in outside the sandwich layer, mesh-supported layer made of steel or iron is provided between sandwich layer and sheetmetal layer, the sandwich layer includes ferrosilicon titanium silicon nitride alloyed powder last layer, intermediate protective layer and real core metal calcium line, real core metal calcium line is wrapped up by intermediate protective layer, ferrosilicon titanium silicon nitride alloyed powder last layer wraps up intermediate protective layer, described ferrosilicon titanium silicon nitride alloyed powder last layer is that the silicon iron powder that particle diameter is below 3mm and nitrogen contain rare earth, niobium, vanadium, the high titanizing titanium silicon powder of boron, real core metal calcium line is with ferrosilicon and containing rare earth, niobium, vanadium, the mass ratio of the high titanium titanium silicon nitride alloy powder of boron is 1:1~2：2~5.The advantages of present invention is higher than the solid metal calcium line recovery rate of routine, and the holding time is longer, and recovery rate is more stable, has significant economic benefit.

Description

A kind of solid calcium metal, ferrosilicon and closed containing rare earth, niobium, the high titanium titanium silicon nitride of vanadium, boron Bronze composite core-spun yarn
Technical field
The present invention relates to a kind of alloy claded wire.
Background technology
China is big steel country, but the ratio shared by the quantity and kind of high-quality steel is smaller, can not only meet that China passes through Ji is built and the requirement of national defense construction, and the waste of resource is quite serious, and the cost for causing smelting iron and steel is continuously increased.Solution Certainly the fundamental way of above mentioned problem is the novel metallurgical subject-micro-alloying technology occurred using the 1970s, that is, to exist Micro (0.001%-0.1%) alloying element is added in steel, just can be to the performance of steel (such as high intensity, high tenacity, good solderable Property and corrosion resistance) reach significant improvement, while valuable alloying element is saved, to reduce cost, this is traditional steel Produce the important symbol converted to modern production.After the 1990s, the main steel producing country in China and the world makes in succession Development plan that is fixed and implementing New Generation Steel PRODUCTION TRAITS, super fine organization, high-cleanness, high, high evenness micro alloyed steel into For the Main Trends of The Development of ferrous materials.At present, micro alloyed steel accounts for the total ratio most of steel, and world average level is about 15%, Industrialized country reaches 30%, and China is less than 5%, therefore China's urgent need transforms the original low-alloy in China with micro-alloying technology High-strength steel system, and micro alloyed steel kind and the Iron ＆ Steel Material of New Generation that exploitation is badly in need of are combined with controlled rolling and controlled cooling.
Core-spun yarn is the various additives (deoxidier, desulfurizing agent, alterant, alloy etc.) for being intended to add in molten steel or iron liquid Certain granularity is broken into, is then included it with cold-rolled low carbon steel band for a composite with random length.Cored Line technology is a kind of external refining means to grow up on the basis of spraying metallurgy technology the eighties.Core-spun yarn is applied to steel-making And casting.Steel inclusion morphology can be purified for making steel, molten steel castability is improved, improves the performance of steel, and can significantly carry The recovery rate of high alloy, low alloy-consumption is dropped, reduce steel-making cost, remarkable in economical benefits.
Titanium silicon nitride core-spun yarn is composite core-spun yarn new in screw-thread steel wire production.Added from the later stage is refined, can The recovery rate of nitrogen in steel titanium is improved, other ferroalloy dosages is reduced, there is significant economic benefit.Due to titanium silicon nitride alloy Proportion kicks the beam（Containing iron content lower than ferro-titanium more than 30% in rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloy of boron）, adding Cheng Zhong, swim in molten steel surface and combined and be oxidized with slag, cause the recovery rate of titanium relatively low（Average out to 27%）, titanium contains in steel Amount 0.0038%, does not reach internal quality control requirement.And pass through bag at Argon station containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloy of boron In the form feeding steel of cored wire, it on the one hand can be that alloy rapidly enters molten steel, avoid alloy from being aoxidized in molten steel by slag；It is another Aspect, the molten steel oxidation of deoxidation treatment is low after stove, it is possible to reduce the scaling loss of titanium, so as to improve and stablize titanium in steel The rate of recovery.
Calcium treatment is the required technique of current special steel smelting, and molten steel Calcium treatment is will with injection metallurgical method or injection feeding technology Calcium metal or alloy add molten steel deep, reach deoxidation, desulfurization, make concise skill outside the stoves of metallurgical effect such as nonmetal inclusion denaturation Art.Because the fusing point of calcium metal is low（838℃）, boiling point is also low（1450℃）, the solubility very little in molten steel（When 1600 DEG C, Calcium vapour pressure is 0.03% when being 0.186MPa）, the density of calcium also very little（1.55g/cm3）, add in molten steel and easily float to steel On slag surface with the oxygen in air and the oxide in slag liquid reaction and scaling loss is fallen.Therefore typically using the core-spun yarn containing calcium metal such as CaSi core-spun yarns（Ca28%~32%）Or cafe core-spun yarns（Ca about 30%, Fe about 70%）, and to be added to molten metal as far as possible during processing Deep, using the static pressure of molten metal, calcium is reacted before calcium bubble is become with the oxygen in steel, sulphur etc., be unlikely to one plus Enter to reform into calcium bubble floating to lose.Nevertheless, the recovery rate of calcium metal still only has 7~18% or so, substantial amounts of metal Calcium all unnecessary wastes.Found by substantial amounts of research, by pulvis（Silicon calcium powder or calcium metal, iron powder）The core-spun yarn of composition enters Softened in the presence of high temperature after ladle, even if higher wire-feeding velocity, core-spun yarn can not also penetrate high-temperature molten steel entrance Deep, it is located at the top of molten steel mostly, it is easy to form calcium bubble floating to slag surface and scaling loss is fallen.
The application for a patent for invention of applicant's application（Application number：201510160282.6 applying date 2015.04.07）It is open A kind of titanium silicon nitride core-spun yarn, including sandwich layer and the sheetmetal layer that is wrapped in outside the sandwich layer, the sandwich layer is titanium silicon nitride Alloy-layer, mesh-supported layer made of steel or iron is provided between sandwich layer and the sheetmetal layer, the titanium silicon nitride alloy-layer is by grain The titanium silicon nitride alloying pellet that footpath is below 3mm forms.It is nano level that carbon or nitrogen in the Ti and steel of the invention, which form size, Compound, their thinning effects to tissue are best, improve the intensity of ferrous materials, and nitrogen pick-up improves the stability of TiN particles, more Effectively prevent Austenite Grain Growth.Cheap nitrogen is made full use of, in the case where ensureing certain strength level, titanium can be saved Addition, further reduce non-hardened and tempered steel cost.
The content of the invention
It is an object of the invention to provide a kind of solid calcium metal, ferrosilicon and containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride of boron Alloyed powder composite core-spun yarn, alloy and calcium are added in micro alloyed steel and can not only solved by using the method for core-spun yarn The problem of rate of recovery is low, at the same it is higher than the solid metal calcium line recovery rate of routine, and the holding time is longer, and recovery rate is more stable The advantages of, there is significant economic benefit.
In order to realize above-mentioned purpose, present invention employs following technical scheme：
A kind of solid calcium metal, ferrosilicon and containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloyed powder composite core-spun yarn of boron, the cored Line includes sandwich layer and the sheetmetal layer being wrapped in outside the sandwich layer, and netted branch made of steel or iron is provided between sandwich layer and sheetmetal layer Layer is supportted, the sandwich layer includes ferrosilicon titanium silicon nitride alloyed powder last layer, intermediate protective layer and real core metal calcium line, real core metal calcium line Wrapped up by intermediate protective layer, ferrosilicon titanium silicon nitride alloyed powder last layer parcel intermediate protective layer, described ferrosilicon titanium silicon nitride alloy Powder bed is the silicon iron powder that particle diameter is below 3mm and nitrogen containing rare earth, niobium, vanadium, the high titanizing titanium silicon powder of boron, real core metal Mass ratio of the calcium line with ferrosilicon and containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloy powder of boron is 1:1~2：2~5；Described contains The high titanium titanium silicon nitride alloy powder of rare earth, niobium, vanadium, boron is made up of following elemental constituent by mass percentage：
Al 1.0 ~ 2.5%,
N 5 ~ 15%,
Mn 2.5 ~ 5.0%,
Mg 1.0 ~ 2.5%,
Ti 40 ~ 60%,
Si 35 ~ 50%,
Nb 0.5 ~ 1.0%,
V 0.5 ~ 1.0%,
B 0.5 ~ 1.0%,
Rare earth element 1.0 ~ 2.0%,
P≤0.1%,
S ≤0.1%；
Fe surpluses.
Preferably, containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloy powder of boron by mass percentage by following element Component is formed：
Al 1.5 ~ 2.0%,
N 8 ~ 12%,
Mn 3.0 ~ 4.0%,
Mg 1.5 ~ 2.0%,
Ti 45 ~ 55%,
Si 40 ~ 45%,
Nb 0.5 ~ 1.0%,
V 0.5 ~ 1.0%,
B 0.5 ~ 1.0%,
Rare earth element 1.0 ~ 2.0%,
P≤0.1%,
S ≤0.1%；
Fe surpluses.
It is 0.1 ~ 2.0mm as the granularity preferably containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloy powder of boron.
The present invention chooses sponge iron and titanium sponge and ferrosilicon and ferromanganese is smelted in a vacuum furnace.In certain process conditions Under, nitrogenized, nitridation is reached optimum efficiency（Provide content）, then pour into ingot casting.Ingot casting through broken pure into certain particle size, A diameter of 13 millimeters of core-spun yarn is overmolding to using iron sheet.Such a core-spun yarn is inserted into steel in the refining later stage with certain payingoff speed In liquid, Ti contents averagely reach 0.008%, Ti average 55%, the Si of rate of recovery recovery rate average 60% in final steel.
Using intermediate protective layer（Box hat）, nexine reality core metal calcium line special construction so that the elevated temperature strength of core-spun yarn Greatly improve, greatly improve the penetration capacity of core-spun yarn so that calcium metal can veritably be added to molten steel deep, utilize steel Hydrostatic, calcium metal is being reacted before becoming bubble with oxygen, sulphur etc. in steel, greatly improve calcium metal recovery rate；Gold in addition The specific surface area of category calcium is substantially reduced, therefore reduces the gasification rate of calcium metal, add calcium metal by molten steel absorb when Between, thus the higher rate of recovery and stably can be obtained in molten steel.
It is composite core-spun yarn new in steel production using solid calcium metal titanium silicon nitride alloyed powder composite core-spun yarn, Added from the refining later stage, the recovery rate of nitrogen in steel titanium silicon can be improved, reduce other ferroalloy dosages, there is significant economic effect Benefit.Its reason is Ti, and to form size with the carbon in steel or nitrogen be nano level compound, and they have grown up strongly to crystal grain Inhibition, and the volume fraction shared by this nano level compound be 2% when, it is best to the thinning effect of tissue.Vanadium (V)：Vanadium is the excellent deoxidier of steel.Add 0.5% vanadium can thinning microstructure crystal grain, raising intensity and toughness in steel.Vanadium is formed with carbon Carbide, hydrogen attack resistance can be improved at high temperature under high pressure.Boron (B)：Micro boron is added in steel can improve the cause of steel Close property and hot rolling performance, improve intensity.Niobium (Nb)：Niobium energy crystal grain thinning and the superheated susceptivity and temper brittleness for reducing steel, are carried High intensity, but plasticity and toughness have declined.Add niobium in ordinary low-alloy steel, can improve and resist under weather-resistant and high temperature Hydrogen, nitrogen, ammonia corrosion ability.Niobium can improving welding property.Add niobium in austenitic stainless steel, intercrystalline corrosion phenomenon can be prevented.It is dilute Earth elements refer to 15 lanthanide series that period of element atom ordinal number is 57-71.These elements are all metals, but they Oxide is much like " soil ", so traditionally claiming rare earth.Rare earth is added in steel, thus it is possible to vary the composition of steel inclusion, form, point Cloth and property, so as to improve the various performances of steel, such as toughness, weldability, cold-forming property.
Alloyed powder of the present invention is added in micro alloyed steel by using the method for core-spun yarn, has the characteristics of following：
1) austenite crystal during soaking is prevented to grow up：The micro alloyed steels such as Ti are not molten in heating before forging or rolling and soaking The migration of the microalloy carbonitride Pinning austenite grain boundary of solution, prevents its crystal grain from growing up, thus is pressing micro alloyed steel Just possess less austenite crystal before power processing, favourable condition is provided for further fining ferrite grains.
2) austenite recrystallization is prevented during ausforming：During ausforming, analysed by strain inducing Crystal grain is grown up after the Ti gone out carbonitride precipitates can suppress deformed austeaite recrystallization and recrystallization, plays crystal grain thinning Effect.Because the carbonitride particle preferential precipitation of the microalloy element of strain induced precipitate is in austenite crystal in hot procedure On boundary, sub boundary and dislocation line, so as to effectively prevent crystal boundary, sub boundary and the motion of dislocation, its effect can not only prevent The beginning of recrystallization process, and the progress of recrystallization process can also be suppressed.
3) precipitation enhancement after ferrite transformation：After ausforming, ferrite transformation will occur, at this moment will have big The disperse microalloy carbonitride particle of amount separates out, and these particles separated out equally also play pinning effect to ferrite crystal grain, limit It is made to grow up.On the other hand, these particles also play precipitation enhancement, improve the intensity of ferrous materials.
4）The size and its volume fraction of microalloy Carbonitride Precipitation particle play a decisive role to ferrite grain size, Precipitation particles is smaller, and volume fraction is bigger, and the ferrite crystal grain obtained is also just smaller.Thus, effort has precipitation particles Larger volume fraction and less size are the big targets in grain refinement process, while are also the direction of invention.Adding While entering these rare elements, while nitrogen pick-up, because changing Ti after nitrogen pick-up in alternate distribution, promotion Ti (C, N ) separate out, the particle size of precipitated phase is obviously reduced, so as to enhance the precipitation enhancement of titanium, increases substantially steel Intensity.Nitrogen is by promoting Ti (C, N) to separate out, and effectively pinning austenite-ferrite grain boundaries, have refined ferrite crystalline substance Grain.Nitrogen pick-up may additionally facilitate the formation of Intragranular Acicular Ferrite, further refine ferritic structure.To Trace Titanium Treatment non-hardened and tempered steel, Nitrogen pick-up improves the stability of TiN particles, more effectively prevents Austenite Grain Growth.Cheap nitrogen is made full use of, Ensure under certain strength level, the addition of vanadium can be saved, further reduce the cost of non-hardened and tempered steel.
Embodiment
Embodiment 1
A kind of solid calcium metal, ferrosilicon and containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloyed powder composite core-spun yarn of boron, the cored Line includes sandwich layer and the sheetmetal layer being wrapped in outside the sandwich layer, and netted branch made of steel or iron is provided between sandwich layer and sheetmetal layer Layer is supportted, the sandwich layer includes ferrosilicon titanium silicon nitride alloyed powder last layer, intermediate protective layer and real core metal calcium line, real core metal calcium line Wrapped up by intermediate protective layer, ferrosilicon titanium silicon nitride alloyed powder last layer parcel intermediate protective layer, described ferrosilicon titanium silicon nitride alloy Powder bed is the silicon iron powder that particle diameter is below 3mm and nitrogen containing rare earth, niobium, vanadium, the high titanizing titanium silicon powder of boron, real core metal Mass ratio of the calcium line with ferrosilicon and containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloy powder of boron is 1: 2：2；Described containing is dilute The high titanium titanium silicon nitride alloy powder of soil, niobium, vanadium, boron is made up of following elemental constituent by mass percentage：
Al 2.0%,
N 10%,
Mn 4.0%,
Mg 2.0%,
Ti 40%,
Si 35%,
Nb 0.5%,
V 0.5%
B 0.5%,
Rare earth element 1.0%,
P ≤0.1%
S ≤0.1%；
Fe surpluses.
Such a core-spun yarn is inserted into molten steel in the refining later stage with certain payingoff speed, and Ti contents averagely reach in final steel Average 55%, the Si of 0.008%, Ti rate of recovery recovery rate average 60%, Ca recovery rate is more stable after line feeding, averagely receives Rate is 30%, average desulfurization degree 26%, highest desulfurization degree 33%, minimum sulfur content 0.006%, average DNA vaccine 20%, minimum Oxygen content 0.00082%, pouring molten steel is normal after line feeding, and slab quality is good, shows solid calcium metal cored wire of the present invention also Inclusion modification, purification molten steel and improvement pouring molten steel performance can be promoted, and can be eliminated in tundish and casting process Nozzle clogging phenomenon.And there was only a small amount of splash and Calcium treatment flue dust during line feeding, it disclosure satisfy that current steel mill The advantages of environmentally friendly steel-making requirements.
Embodiment 2
A kind of solid calcium metal, ferrosilicon and containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloyed powder composite core-spun yarn of boron, the cored Line includes sandwich layer and the sheetmetal layer being wrapped in outside the sandwich layer, and netted branch made of steel or iron is provided between sandwich layer and sheetmetal layer Layer is supportted, the sandwich layer includes ferrosilicon titanium silicon nitride alloyed powder last layer, intermediate protective layer and real core metal calcium line, real core metal calcium line Wrapped up by intermediate protective layer, ferrosilicon titanium silicon nitride alloyed powder last layer parcel intermediate protective layer, described ferrosilicon titanium silicon nitride alloy Powder bed is the silicon iron powder that particle diameter is below 3mm and nitrogen containing rare earth, niobium, vanadium, the high titanizing titanium silicon powder of boron, real core metal Mass ratio of the calcium line with ferrosilicon and containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloy powder of boron is 1: 1：3；Described containing is dilute The high titanium titanium silicon nitride alloy powder of soil, niobium, vanadium, boron is made up of following elemental constituent by mass percentage：
Al 1.0%,
N 15%,
Mn 4.0%,
Mg 1.0%,
Ti 50%,
Si 35%,
Nb 0.5%,
V 0.5%
B 0.5%,
Rare earth element 1.0%,
P≤0.1%,
S ≤0.1%；
Fe surpluses.
Such a core-spun yarn is inserted into molten steel in the refining later stage with certain payingoff speed, and Ti contents averagely reach in final steel Average 55%, the Si of 0.008%, Ti rate of recovery recovery rate average 60%, Ca recovery rate is more stable after line feeding, averagely receives Rate is 30%, average desulfurization degree 26%, highest desulfurization degree 33%, minimum sulfur content 0.006%, average DNA vaccine 20%, minimum Oxygen content 0.00082%, pouring molten steel is normal after line feeding, and slab quality is good, shows solid calcium metal cored wire of the present invention also Inclusion modification, purification molten steel and improvement pouring molten steel performance can be promoted, and can be eliminated in tundish and casting process Nozzle clogging phenomenon.And there was only a small amount of splash and Calcium treatment flue dust during line feeding, it disclosure satisfy that current steel mill The advantages of environmentally friendly steel-making requirements.
Embodiment 3
A kind of solid calcium metal, ferrosilicon and containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloyed powder composite core-spun yarn of boron, the cored Line includes sandwich layer and the sheetmetal layer being wrapped in outside the sandwich layer, and netted branch made of steel or iron is provided between sandwich layer and sheetmetal layer Layer is supportted, the sandwich layer includes ferrosilicon titanium silicon nitride alloyed powder last layer, intermediate protective layer and real core metal calcium line, real core metal calcium line Wrapped up by intermediate protective layer, ferrosilicon titanium silicon nitride alloyed powder last layer parcel intermediate protective layer, described ferrosilicon titanium silicon nitride alloy Powder bed is the silicon iron powder that particle diameter is below 3mm and nitrogen containing rare earth, niobium, vanadium, the high titanizing titanium silicon powder of boron, real core metal Mass ratio of the calcium line with ferrosilicon and containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloy powder of boron is 1: 2：4；Described containing is dilute The high titanium titanium silicon nitride alloy powder of soil, niobium, vanadium, boron is made up of following elemental constituent by mass percentage：
Al 2.5%,
N 5%,
Mn 2.5%,
Mg 2.0%,
Ti 50%,
Si 35%,
Nb 0.5%,
V 0.5%
B 0.5%,
Rare earth element 1.0%,
P≤0.1%,
S ≤0.1%；
Fe surpluses.
Such a core-spun yarn is inserted into molten steel in the refining later stage with certain payingoff speed, and Ti contents averagely reach in final steel Average 55%, the Si of 0.008%, Ti rate of recovery recovery rate average 60%, Ca recovery rate is more stable after line feeding, averagely receives Rate is 30%, average desulfurization degree 26%, highest desulfurization degree 33%, minimum sulfur content 0.006%, average DNA vaccine 20%, minimum Oxygen content 0.00082%, pouring molten steel is normal after line feeding, and slab quality is good, shows solid calcium metal cored wire of the present invention also Inclusion modification, purification molten steel and improvement pouring molten steel performance can be promoted, and can be eliminated in tundish and casting process Nozzle clogging phenomenon.And there was only a small amount of splash and Calcium treatment flue dust during line feeding, it disclosure satisfy that current steel mill The advantages of environmentally friendly steel-making requirements.

Claims (3)

1. a kind of solid calcium metal, ferrosilicon and containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloyed powder composite core-spun yarn of boron, it is special Sign is that the core-spun yarn includes sandwich layer and the sheetmetal layer being wrapped in outside the sandwich layer, and steel or iron are provided between sandwich layer and sheetmetal layer Manufactured mesh-supported layer, the sandwich layer include ferrosilicon titanium silicon nitride alloyed powder last layer, intermediate protective layer and real core metal calcium line, Real core metal calcium line is wrapped up by intermediate protective layer, ferrosilicon titanium silicon nitride alloyed powder last layer parcel intermediate protective layer, described ferrosilicon Titanium silicon nitride alloyed powder last layer is the silicon iron powder that particle diameter is below 3mm and nitrogen containing rare earth, niobium, vanadium, the high titanizing titanium silicon of boron Powder, mass ratio of the real core metal calcium line with ferrosilicon and containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloy powder of boron are 1:1~ 2：2~5；It is described containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloy powder of boron by mass percentage by following elemental constituent structure Into：
Al 1.0 ~ 2.5%,
N 5 ~ 15%,
Mn 2.5 ~ 5.0%,
Mg 1.0 ~ 2.5%,
Ti 40 ~ 60%,
Si 35 ~ 50%,
Nb 0.5 ~ 1.0%,
V 0.5 ~ 1.0%,
B 0.5 ~ 1.0%,
Rare earth element 1.0 ~ 2.0%,
P≤0.1%,
S ≤0.1%；
Fe surpluses.
2. a kind of solid calcium metal according to claim 1, ferrosilicon and closed containing rare earth, niobium, the high titanium titanium silicon nitride of vanadium, boron Bronze composite core-spun yarn, it is characterised in that containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloy powder of boron by mass percentage by with Under elemental constituent form：
Al 1.5~2.0%
N 8~12%
Mn 3.0~4.0%
Mg 1.5~2.0%
Ti 45~55%
P ≤0.1%
S ≤0.1%
Si 40~45%；
Fe surpluses.
3. a kind of solid calcium metal according to claim 1 or 2, ferrosilicon and containing rare earth, niobium, vanadium, the high titanium titanium nitride of boron Silicon alloy powder composite core-spun yarn, it is characterised in that the granularity containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloy powder of boron be 0.1 ~ 2.0mm。
CN201611017061.4A 2016-11-19 2016-11-19 A kind of solid calcium metal, ferrosilicon and containing rare earth, niobium, vanadium, the high titanium titanium silicon nitride alloyed powder composite core-spun yarn of boron Withdrawn CN107338341A (en)

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Application publication date: 20171110