CN105463159B - A kind of multielement nitro-alloy core-spun yarn and its application process in Q620D steel grade strengthening treatment process - Google Patents
A kind of multielement nitro-alloy core-spun yarn and its application process in Q620D steel grade strengthening treatment process Download PDFInfo
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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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
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- 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
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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Abstract
The invention discloses a kind of multielement nitro-alloy core-spun yarn and its application process in Q620D steel grade strengthening treatment process, belong to alloy material applied technical field.The core of multielement nitro-alloy core-spun yarn includes consisting of composition：N：15.5~24.9%, V：27~48%, Si：18~32%, Nb：0.3~4%, Mn：0.05~3%, B：0.3~4.5%, Ti：0.8~7.0%, Cr：0.1~5.0%, C≤1.4%, P≤0.10%, S≤0.10%, surplus are Fe and trace impurity；The present invention design screening most suitable multielement nitro-alloy of composition, added with transmitting N and in connection beneficial to V, B, Nb, preferred pair Steel Properties have strengthened the beneficial element of positive correlation effect simultaneously, requirement with Q620D steel grade microalloying reinforcement process extremely matches, and it is strengthened effect and is not fully exerted.
Description
Technical field
The invention belongs to alloy material applied technical field, more specifically to a kind of multielement nitro-alloy cored
Line and its application process in Q620D steel grade strengthening treatment process.
Background technology
Production Q620D steel at present, to improve the performance indications such as its intensity, typically with vanadium nitride (V：75~78%, N：12
~16%) or ferrovanadium nitride (V：42~57%, N：9~14%) microalloying technique is carried out to molten steel to be expected to reach its reinforcing mesh
's.For example, Chinese Patent Application No. is 201310262303.6, data of publication of application is in September, 2013 patent application of 25 days text
Part discloses a kind of new technology for adding ferrovanadium nitride production low-alloy structural steel, and step is as follows：(1) converter smelting；(2) LF essences
Refining；(3) continuous casting；(4) compared with the prior art hot rolling, the invention have advantages below：1st, innovative design Q345B hot rolled strips
Component system is learned, realizes rational Composition Control technology；Mn constituent contents at least reduce by 0.45%, while add 0.015%
~0.030% V element, ton steel cost further reduce；2nd, conventional high manganese is substituted with ferrovanadium nitride microalloying,
The addition of alloying element is reduced, realizes minimizing production, while preferably played refined crystalline strengthening and precipitation strength.
Subject matter existing for the above method and deficiency are：One：The effective rate of utilization of vanadium is low, and only a fraction V (accounts for 45
~50%) invigoration effect, is produced into VN, VC with N, C-shaped, a part of V is present in steel in the form of metal V, without bright
Aobvious invigoration effect；Second, the process of addition is more extensive, added usually in molten steel tapping process with steel stream, so
Because liquid steel temperature is different, molten steel causes microalloying with variables of many factors such as quantity of slag difference, steel oxygen content in water differences
Difference on effect is very big；Third, the physical state of additive is inconsistent, general nitro-alloy lumpiness is 5~60mm hybrid particles,
Make it unbalanced with the dynamic conditions in molten steel fusion process, and cause the difference for strengthening effect；Fourth, it strengthens effect not
It can give full play to, stability is poor, causes cost to raise, and steel grade hit rate reduces.
Chinese Patent Application No. is 201210377151.X, and data of publication of application is literary for the patent application on December 19th, 2012
Part discloses the core-spun yarn of a kind of Metallurgical V-N microalloying and complex deoxidization, and it includes core and coated steel band, its skill
Art is characterized by：The core of core-spun yarn is made up of the agent of increasing vanadium, nitrogen promoter and deoxidation nitrogen fixation agent three parts, and the granularity of each component is less than
6mm, it is vanadium iron, ferrovanadium nitride or vanadic anhydride to increase vanadium agent；Nitrogen promoter is ferro-silicon nitride, nitridation silicomanganese, nitrided ferromanganese, nitridation
Ferrochrome, silicon nitride, aluminium nitride or carbon CaCl2；Deoxidation nitrogen fixation agent is at least one of metallic aluminium, calcium, magnesium, barium or by them
The alloy of composition, can also include the one or more in titanium, zirconium, niobium, manganese, chromium, silicon, carbon and iron, but the invention exist with
Lower weak point：(1) vanadium iron, ferrovanadium nitride, vanadic anhydride are its structure and the entirely different material of property, such as V2O5It is V
Oxide, add in steel as a kind of oxide to be mingled with and do not play any invigoration effect to steel；(2) deoxidation nitrogen fixation agent is to divide
Scattered seed shape is bundled into core-spun yarn with other materials with steel band, because of the fusing point of its each material and the difference of proportion during molten steel is added
, they are not almost combined less than together, wherein deoxidier preferentially with oxygen in steel with reference to and form deoxidation products and become to be mingled with steel.
Chinese Patent Application No. is 201410131544.1, and data of publication of application is that in August, 2014 patent application document of 6 days discloses one
Kind composite nitrogen alloy claded wire and preparation method thereof, the core-spun yarn is made up of inner core material and clad, and inner core material is by vanadium
Iron, ferrovanadium nitride, vanadium nitride, ferro-silicon nitride, nitridation silicomanganese, nitridation ferrotianium, ferro-boron, nitridation ferro-boron, ferro-niobium and nitridation ferro-niobium
In three kinds it is mixed above form, more than two kinds of nitride or nitro-alloy are comprised at least in inner core material；Clad is light
Bright steel band, the preparation method of the core-spun yarn are：Prepare inner core material first, nitrogen content on request, alloying element content and
The species of target steel grade carries out dispensing, is then milled, is mixed and is granulated inner core material is made, then with bright steel band general
Inner core material is overmolding to the core-spun yarn of circle；From the aspect of technological progress the invention relative to single block nitro-alloy to molten steel
Carry out microalloying and strided forward major step really, but the supply of the core-spun yarn nitrogen source of the invention is insufficient, the reinforcing to liquid steel refining
DeGrain.
The content of the invention
1. to solve the problems, such as
The effective rate of utilization that vanadium be present for existing molten steel microalloying technique is low, strengthens effect to give full play to,
The problems such as stability is poor, cost is high, the present invention provide a kind of multielement nitro-alloy core-spun yarn and its at Q620D steel grade reinforcings
Application process in science and engineering skill, the present invention design screening the most suitable multielement nitro-alloy of composition, added with beneficial to V, B,
Nb transmission N are simultaneously in connection, while Steel Properties have been strengthened with the beneficial element of positive correlation effect, such as Si, Mn, Ti, Cr；This hair
The composition design of the multielement nitro-alloy of bright screening extremely matches with the requirement of Q620D steel grade microalloying reinforcement process, both
It fully ensure that the supply of N element and taken into account the positive correlation of each alloying element, it is strengthened effect and be not fully exerted.
2. technical scheme
In order to solve the above problems, the technical solution adopted in the present invention is as follows：
A kind of multielement nitro-alloy core-spun yarn, including core and clad, described core are multielement nitro-alloys,
Nitrogen treatment is carried out by more than three kinds materials in vanadium iron, ferrosilicon, metallic silicon, ferromanganese, manganese metal, ferrotianium, ferrochrome, ferro-boron and ferro-niobium
It is prepared, core includes consisting of composition：N：15.5~24.9%, V：27~48%, Si：18~32%, Nb：0.3~
4%, Mn：0.05~3%, B：0.3~4.5%, Ti：0.8~7.0%, Cr：0.1~5.0%, C≤1.4%, P≤0.10%,
S≤0.10%, surplus are Fe and inevitable impurity；Described clad is bright steel band.
Preferably, described core is made up of particle diameter of 0.01~4.5mm multielement nitro-alloy.
Preferably, in described core component the ratio of V, B and Nb mass fraction sum and N mass fractions be 1.69~
2.71。
Application of the above-mentioned multielement nitro-alloy core-spun yarn in Q620D steel grade strengthening treatment process.
Application process of the above-mentioned multielement nitro-alloy core-spun yarn in Q620D steel grade strengthening treatment process, its step
For：
1) converter terminal is tapped：Including thermometric, terminal constituent analysis, slag-stopping tapping, deoxidation of molten steel, molten steel alloy chemical industry
Skill；
2) liquid steel refining：Molten steel composition and temperature are adjusted, and carries out molten steel degassing, except purification technique is mingled with, in molten steel
The multielement nitro-alloy core-spun yarn described in claim 1 is fed during refining；
3) continuous casting：Refined molten steel is cast into strand；
4) strand rolls：Control for Kiln Temperature is at 1250~1290 DEG C, and the heating and thermal insulation time is 3.5~4.5h, using controlled rolling control
Cold technique, 1030~1080 DEG C of start rolling temperature, secondary 900~935 DEG C of rolling temperature, 790~840 DEG C of finishing temperature.
Preferably, argon-nitrogen mixture gas are blown during liquid steel refining, wherein argon gas volume fraction is 20~50%, nitrogen
Volume fraction is 50~80%.
Preferably, during liquid steel refining temperature control at 1590~1610 DEG C.
Preferably, the wire-feeding velocity of multielement nitro-alloy core-spun yarn is 200~280m/min during liquid steel refining, is fed
Line amount is 1.1~2.2kg/ts (1.1~2.2 kilograms of core-spun yarns/ton steel).
Preferably, adjustment molten steel composition in the step 2), makes the molten steel composition be：C：0.14~0.18%, Si：0.35~
0.60%, Mn：1.5~2.0%, V：0.07~0.11%, Nb：0.001~0.005%, Ti：0.004~0.009%, B：
0.003~0.009%, N：0.011~0.015%, P≤0.03%, S≤0.025%, Al≤0.01%.
Preferably, H content control is controlled in≤15ppm in≤4ppm, O content in Q620D steel.
Multielement nitro-alloy proposed by the invention is compared with contrasting the core-spun yarn in patent 201410131544.1, its thing
Matter immanent structure has a difference substantially, multielement nitro-alloy be several alloying elements simultaneously with nitrification and form nitridation
Alloy, multielement nitro-alloy of the present invention ensure that the supply of nitrogen source and prioritizing selection during molten steel microalloying
V, the precious metal element such as B, Nb, it is improved in an optimal manner and strengthens effect, microalloying technique involved in the present invention is to steel
The refinery practice of water has new requirement, creates optimal molten steel microalloying condition, increases substantially it and strengthens effect and stably
Property.
3. beneficial effect
Compared to prior art, beneficial effects of the present invention are：
(1) present invention is directed to problems of the prior art, and the most suitable multielement nitro-alloy of composition is screened in design,
(V+B+Nb)/N ratio (ratio of tri- kinds of element mass fraction sums of V, B and Nb and N mass fractions) is considered first, makes its V, B, Nb
Fully combined with N and play its invigoration effect, be beneficial to transmit N and in connection to V in addition, the present invention is added with, while to rigidity
The beneficial element of positive correlation effect can be strengthened, such as Si, Mn, Ti, Cr, again, the present invention are existing using being totally different from
Process but a kind of new process carry out nitro-alloy microalloy treatment to molten steel；
(2) the ratio between the suitable V+B+Nb three constituent contents sum of contrived experiment screening verification of the present invention and N content are 1.69
~2.71, theoretic V/N ratios are 3.64 (i.e. V and N forms the ratio of the mass fraction needed for both VN compounds completely),
Single vanadium nitride or the V/N ratios of ferrovanadium nitride are respectively 5.13 and 4.3, and it is inadequate to illustrate its N content, while because of molten steel
Thermodynamic condition and dynamic conditions influence, it is desirable to actual leaded wastewater is higher than theoretical leaded wastewater, thus the present invention take it is more
Element nitro-alloy ensures the supply of nitrogen source；Allow alloying element to be adequately formed nitride or nitrogen carbide, intergranular precipitation and
Crystal grain thinning, to strengthen effect up to optimal.
(3) present invention design screening verification cost performance highest multielement nitro-alloy：Its composition is N：15.5~
24.9%, V：27~48%, Si：18~32%, Nb：0.3~4%, Mn：0.05~3%, B：0.3~4.5%, Ti：0.8~
7.0%, Cr：0.1~5.0%, C≤1.4%, P≤0.10%, S≤0.10%, surplus are Fe and trace impurity；Select the group
Divide the principle of content nitro-alloy：One is to maintain enough N contents, its V, B, Nb is fully formed precipitation with N (C) chemical combination heavy
Shallow lake invigoration effect, second, the content of adjustment Si, Cr, Mn, Ti element, reaches suitable reinforcing effect, make its multielement nitrification
The cost performance of gold maximizes；
(4) multielement nitro-alloy is broken into 0.01~4.5mm granulars and is overmolding to core-spun yarn by the present invention, Ke Yijing
Multielement nitro-alloy is added to suitable molten steel deep by quasi- ground makes nitro-alloy melt in the short period of time, design screening
Verify and Steel Properties strengthened with the minimum microalloying technique of influential effect variable factors, to reach strengthen effect most fully, work
The purpose of skill stability is good, target steel grade shoots straight；
(5) present invention reject prior art completely adds the technique of block nitro-alloy in tapping process, and designs
And optimal liquid steel refining process is created, and multielement nitro-alloy is accurately added to molten steel deep in a manner of line feeding,
Argon-nitrogen mixture gas are blown into during line feeding simultaneously, are further strengthened required during multielement nitro-alloy microalloying
Process conditions；With following superiority：First, it ensure that the temperature of refined molten steel, composition, oxygen content etc. are stable suitable at one
In the range of, second, multielement nitro-alloy can under stable, suitable a thermodynamic condition and dynamic conditions with
Molten steel fuses, and the molten steel refining technology that the present invention innovates make it that nitro-alloy reinforcing effect is abundant, and technology stability is good, target steel
Kind shoots straight；
(6) composition design for the multielement nitro-alloy that the present invention screens and Q620D steel grade microalloying reinforcement process
It is required that extremely matching, it not only fully ensure that the supply of N element but also taken into account the positive correlation of each alloying element, it is strengthened effect
Fruit is not fully exerted；
(7) present invention process stability obtains the embodiment of protrusion, and the stability that molten steel strengthens effect obtains the embodiment of protrusion,
The hit rate of steel grade target capabilities increases substantially, and reaches more than 99%；The present invention makes the utilization rate of alloying element significantly carry
Height, technology stability and strengthen effect stability it is good, make its integrate use cost can be reduced compared with former technique 26% with
On；
(8) molten steel refining technology of the invention ensure that refined molten steel temperature, composition are uniform and stable, gas content in steel
(N, H, O) control is accurate, and multielement nitro-alloy core-spun yarn is added when microalloying requirement is fully achieved to the deep of molten steel,
The thermodynamics and kineticses condition required for optimal molten steel microalloying technique is created, prior art is avoided and was tapping
The influence of factors variable when being added in journey.
Embodiment
The present invention is further described below with reference to specific embodiment.
Embodiment 1
(1) multielement nitro-alloy is selected, its composition is：N：17.5%, V：27%, Si：32%, Mn：3%, Nb：4%,
B：0.3%, Cr：0.1%, Ti：5.6%, C：1.4%, P：0.06%, S：0.05%, surplus is Fe and trace impurity, is broken into
0.01~4.5mm little particles.
(2) bright steel band is selected, its composition is：C：0.06%th, Si≤0.01%, Mn：0.035%th, P：0.018%th, S：
0.021%th, Al：0.06%, surplus Fe, thickness 0.75mm.
(3) steel band of (1) processing material and (2) selection is overmolding to φ 13mm core-spun yarns with core-spun yarn unit.
(4) (3) processing is formed into multielement nitro-alloy core-spun yarn to be used in converter steel-smelting molten steel refining process.
(5) converter of 180 tons of nominal capacity is selected, smelting steel grade is Q620D, and its refinery practice is：(a) converter terminal goes out
(liquid steel temperature controls at 1660~1680 DEG C steel；Molten steel composition controls：C：0.05~0.11%, P≤0.025%, S≤
0.020%th, O≤0.008%；In terminal tapping process, floating plug separates molten steel and bits made of refractory material, makes
Its slag is not flowed into ladle with molten steel；By the use of Ca-Al alloys as deoxidier, oxygen is taken off to below 40ppm in steel；Use ferrosilicon
(75Si), ferromanganese (65Mn) and silicomangan (65Mn17Si) carry out molten steel alloying, right with petroleum coke carburant (C >=98%)
Molten steel recarburization；(b) (molten steel composition adjusts liquid steel refining, makes its C：0.12~0.18%, Si：0.40~0.50%, Mn：1.75
~1.95%, P≤0.030%, S≤0.025%, Al≤0.010%, liquid steel temperature adjustment make its temperature control 1590~
1600 DEG C, and carry out molten steel degassing, except the purification of molten steel refinery practice such as being mingled with, and make its steel grade (H, O) content for H≤
4ppm, O≤15ppm.(c) (line feeding amount controls in 1.6kg/ts (i.e. 1.6 refined molten steel feeding multielement nitro-alloy core-spun yarn
Kilogram core-spun yarn steel per ton), wire-feeding velocity is controlled in 200m/min)；(d) refined molten steel carries out overall process Argon, and is feeding
Multielement nitro-alloy core-spun yarn is front and rear to be blown into argon-nitrogen mixture gas from ladle bottom by ventilated element made of refractory material
(wherein argon gas volume fraction is 20%, nitrogen 80%), 8 minutes mixed gas blowing times, flow is controlled in 4M3/min
(make its liquid steel temperature and homogenization of composition, and carry out measuring temp of molten steel and trimming：C：0.17%th, Si：0.60%th, Mn：
1.5%th, V：0.086%th, Al：0.007%th, N：0.015%th, P：0.026%th, S：0.020%, temperature：1590℃)；(e) refine
Molten steel casts strand (160mm × 1200mm) into continuous casting workshop section.
(6) strand rolls
Control for Kiln Temperature is at 1250~1290 DEG C, and the heating and thermal insulation time is 4.0h, using cooling controlling and rolling controlling process, start rolling temperature
1030~1080 DEG C, secondary 910~935 DEG C of rolling temperature, 790~840 DEG C of finishing temperature.The rolling mill practice of the present embodiment is main
Be embodied in specific heating-up temperature and cooling controlling and rolling controlling process, after it is rolled denaturation every time, austenite occur repeat recrystallization and
Fully refined, the very disperse of multielement nitro-alloy, equably analysed on boundary of the austenite to ferritic transformation
Go out and effectively hinder the migration of austenite grain boundary, and effectively prevent ferrite crystal grain from growing up and crystal grain thinning, it is strong so as to produce
Strong precipitation enhancement, while improve the toughness plasticity of steel.
(7) rolled steel (22mm plates) performance detection, yield strength (Rel) are 685Mpa, and tensile strength (Rm) is
881Mpa, elongation (A) are 18.2%.
Welding performance test is carried out to the Q620D shaped steel that the present embodiment is smelted, after welding, then carries out tension test, intensity
It is basically unchanged, sample stretching fracture is ductile fracture on the mother metal away from plumb joint.Welding crack sensibility index (Pcm)
For 0.17%；The welding crack sensibility indices P cm of former technique is in 0.20~0.25% scope.The comprehensive use of the present embodiment into
This reduces by 27% than former process costs.
Multielement nitro-alloy in the present embodiment is prepared using following methods：
(1) select raw material, ferrosilicon, vanadium iron, manganese metal, ferrotianium, ferrochrome, ferro-boron and ferro-niobium and be broken into respectively granularity≤
10mm；Then it is milled, its fine powder fineness≤0.15mm；The each component mass fraction of the vanadium iron of selection is V：75%, C：0.75%,
Si：2.5%, Al：3.0%, P：0.1%, S：0.08%, surplus is the inevitable impurity such as Fe and micro Ca, Mg；Ferrosilicon
Each component mass fraction is Si：72%, Mn：0.5%, Cr：0.5%, P：0.1%, S：0.1%, surplus be Fe and micro C, Al,
The inevitable impurity such as Ca, Mg；The each component mass fraction of ferrotianium is Ti：72%, Al：3.0%, Si：1.0%, P：
0.04%, S：0.03%, Mn：1.5%, C≤0.30%, surplus Fe；The each component mass fraction of ferromanganese is：Mn：98.3%,
Fe：1.1%, Si：0.3%, C：0.09%, P：0.03%, S：0.02%, surplus is Fe and trace of Al, Ca, Mg etc. are inevitable
Impurity；The each component mass fraction of ferrochrome is Cr：52%, C：0.7%, Si：2.3%, P：0.04%, S：0.05%, surplus
For Fe；The each component mass fraction of ferro-boron is B：19%, C：1.6%, Si：8.2%, Al：1.3%, S：0.07%, P：
0.12%, surplus Fe；The each component mass fraction of ferro-niobium is Nb：55%, C：0.04%, Si：7.2%, Al：1.3%, S：
0.02%, P：0.03%, surplus Fe；Above fraction is mass fraction.
(2) raw material fine powder that (1) processing obtains is matched, then plus 2% (mass fraction) bonding agent fully mixes
And it is more than 100Mpa pressure lower lock block in pressure with strength ball press；Bonding agent is by polyborosiloxane 33%, borax 16%, poly-
Resin 21%, carboxymethyl cellulose 15%, butyl stearate 10% and polyvinyl alcohol 5% form, and above fraction is quality
Fraction；
(3) ball block made of (2) is put into vacuum drying oven and heated, control temperature is in the range of 680~750 DEG C, simultaneously
Ar gases are filled with burner hearth, pre-process 3h.
(4) block pre-processed is put into nitriding furnace and carries out nitrogen treatment, nitrogen is passed through during nitrogen treatment, controlled
System nitridation furnace pressure 0.15Mpa, in stove the first stage be warming up to 900~1000 DEG C, be incubated 4h, second stage is warming up to 1150
~1200 DEG C, 9h is incubated, the phase III is warming up to 1300~1350 DEG C, is incubated 6h, is heated to 1450~1530 DEG C, insulation
12h, last furnace cooling obtain composition to less than 300 DEG C：N：17.5%, V：27%, Si：32%, Mn：3%, Nb：4%, B：
0.3%, Cr：0.1%, Ti：5.6%, C：1.4%, P：0.06%, S：0.05%, surplus is the multielement of Fe and trace impurity
Nitro-alloy.
Embodiment 2
(1) multielement nitro-alloy is selected, its composition is：N：15.5%, V：48%, Si：20%, Cr：5.0%, Mn：
0.6%, Ti：0.8%, B：1.9%, Nb：0.3%, C：0.3%, P：0.05%, S：0.10%, surplus is Fe and trace impurity,
It is broken into 0.01~4.5mm little particles.
(2) bright steel band is selected, its composition is：C：0.06%th, Si≤0.01%, Mn：0.032%th, P：0.02%th, S：
0.019%th, Al：0.062%, surplus Fe, thickness 0.30mm.
(3) strip of (1) processing material and (2) selection is overmolding to φ 9mm core-spun yarns with core-spun yarn unit.
(4) (3) are processed into multielement nitro-alloy core-spun yarn and are used for pneumatic steelmaking, during liquid steel refining.
(5) converter of 120 tons of nominal capacity is selected, smelting steel grade is Q620D, and its refinery practice is：(a) converter terminal goes out
(liquid steel temperature controls at 1660~1680 DEG C steel；Molten steel composition control exists：C：0.05~0.11%, P≤0.025%, S≤
0.020%th, O≤0.008%；In terminal tapping process, floating plug separates molten steel and bits made of refractory material, makes
Its slag is not flowed into ladle with molten steel；With Si-Al-Ba-Ca complex deoxidizer, oxygen is taken off to below 40ppm in steel；Use ferrosilicon
(75Si), ferromanganese (65Mn) and silicomangan (65Mn17Si) carry out molten steel alloying, right with calcining coal carburant (C >=93%)
Molten steel recarburization, (molten steel composition adjusts (b) liquid steel refining, makes its C：0.12~0.17%, Si：0.40~0.55%, Mn：1.7~
1.9%th, P≤0.025%, S≤0.022%, Al：0.007~0.015%, liquid steel temperature adjustment makes its temperature control 1590
~1610 DEG C, and degassing is carried out molten steel, except the purification of molten steel refinery practice such as being mingled with.And make its steel grade (H, O) content for H≤
4ppmm, O≤15ppm)；(c) (line feeding amount controls in 1.1kg/ts, line feeding refined molten steel feeding multielement nitro-alloy core-spun yarn
Speed control is in 220m/min)；(d) refined molten steel carries out overall process Argon, and before multielement nitro-alloy core-spun yarn is fed
Being blown into argon-nitrogen mixture gas by ventilated element made of refractory material from ladle bottom afterwards, (Ar gases fraction is 50%, N2
Gas fraction is 50%), 11 minutes mixed gas blowing times, flow is controlled in 5M3/ min, (make its liquid steel temperature and into
Divide homogenization, and carry out measuring temp of molten steel and trimming：C：0.14%th, Si：0.55%th, Mn：1.73%th, V：0.07%th, Cr：
0.006%th, Ti：0.004%th, Al：0.009%th, B：0.003%th, Nb：0.001%th, N：0.011%th, P：0.025%th, S：
0.021%, temperature：1590℃)；(e) refined molten steel casts strand (100mm × 1200mm) into continuous casting workshop section.
(6) strand rolls
Control for Kiln Temperature is at 1250~1290 DEG C, and the heating and thermal insulation time is 3.5h, using cooling controlling and rolling controlling process, start rolling temperature
1030~1070 DEG C, secondary 900~930 DEG C of rolling temperature, 790~830 DEG C of finishing temperature.The rolling mill practice of the present embodiment is main
Be embodied in specific heating-up temperature and cooling controlling and rolling controlling process, after it is rolled denaturation every time, austenite occur repeat recrystallization and
Fully refined, the very disperse of multielement nitro-alloy, equably analysed on boundary of the austenite to ferritic transformation
Go out and effectively hinder the migration of austenite grain boundary and effectively prevent ferrite crystal grain from growing up and crystal grain thinning, it is strong so as to produce
Precipitation enhancement, while improve the toughness plasticity of steel.
(7) rolled steel (10mm plates) performance detection, yield strength (Rel) are 693Mpa, and tensile strength (Rm) is
869Mpa, elongation percentage (Agt) are 19.3%.
Welding performance is carried out to the Q620D shaped steel kind that the present embodiment is smelted, after welding, then carries out tension test, rheobase
This is constant, and sample stretching fracture is ductile fracture on the mother metal away from plumb joint.Welding crack sensibility index (Pcm) is
0.21%；The welding crack sensibility indices P cm of former technique is in 0.20~0.25% scope.The synthesis use cost of the present embodiment
26% is reduced than former process costs.
Multielement nitro-alloy in the present embodiment is prepared using following methods：
(1) select raw material, ferrosilicon, vanadium iron, ferromanganese, ferrotianium, ferrochrome, ferro-boron and ferro-niobium and be broken into respectively granularity≤
10mm；Then it is milled, its fine powder fineness≤0.15mm；The each component mass fraction of the vanadium iron of selection is V：75%, C：0.75%,
Si：2.5%, Al：3.0%, P：0.1%, S：0.08%, surplus is the inevitable impurity such as Fe and micro Ca, Mg；Ferrosilicon
Each component mass fraction is Si：72%, Mn：0.5%, Cr：0.5%, P：0.1%, S：0.1%, surplus be Fe and micro C, Al,
The inevitable impurity such as Ca, Mg；The each component mass fraction of ferrotianium is Ti：72%, Al：3.0%, Si：1.0%, P：
0.04%, S：0.03%, Mn：1.5%, C≤0.30%, surplus Fe；The each component mass fraction of ferromanganese is Mn：65%, Si：
3.3%, C：3.9%, P：0.16%, S：0.19%, surplus is the inevitable impurity such as Fe and micro Ca, Mg；Ferrochrome it is each
Constituent mass fraction is Cr：60%, C：0.8%, Si：2.1%, P：0.05%, S：0.03%, surplus Fe；The each group of ferro-boron
It is B to divide mass fraction：17%, C：2.3%, Si：6.7%, Al：1.4%, S：0.06%, P：0.11%, surplus Fe；Ferro-niobium
Each component mass fraction be Nb：48%, C：0.04%, Si：8.3%, Al：0.8%, S：0.02%, P：0.03%, surplus is
Fe.Above fraction is mass fraction.
(2) raw material fine powder that (1) processing obtains is matched, then plus 2.5% (mass fraction) bonding agent is fully mixed
Pressure lower lock block that is even and being more than 100Mpa in pressure with strength ball press；Bonding agent by polyborosiloxane 31%, borax 19%,
Polymer resin 24%, carboxymethyl cellulose 11%, butyl stearate 9% and polyvinyl alcohol 6% form, and above fraction is quality
Fraction；
(3) ball block made of (2) is put into vacuum drying oven and heated, control temperature is in the range of 680~750 DEG C, simultaneously
Ar gases are filled with burner hearth, pre-process 3h.
(4) block pre-processed is put into nitriding furnace and carries out nitrogen treatment, nitrogen is passed through during nitrogen treatment, controlled
System nitridation furnace pressure 0.15Mpa, in stove the first stage be warming up to 900~1000 DEG C, be incubated 4h, second stage is warming up to 1150
~1200 DEG C, 9h is incubated, the phase III is warming up to 1300~1350 DEG C, is incubated 6h, is heated to 1450~1530 DEG C, insulation
12h, last furnace cooling obtain composition to less than 300 DEG C：N：15.5%, V：48%, Si：20%, Mn：0.6%, Ti：
0.8%, Cr：5.0%, B：1.9%, Nb：0.3%, C：0.3%, P：0.05%, S：0.10%, surplus is Fe and trace impurity
Multielement nitro-alloy.
Embodiment 3
(1) multielement nitro-alloy is selected, its composition is：N：24.9%, V：33.2%, Si：18%, Mn：0.05%,
Ti：7.0%, Cr：1.8%, B：4.5%th, Nb：1.6%, C：0.4%, P：0.10%, S：0.06%, surplus is Fe and micro miscellaneous
Matter, it is broken into 0.01~4.5mm little particles.Above fraction is mass fraction.
(2) bright steel band is selected, its composition is：C：0.07%th, Si≤0.01%, Mn：0.03%th, P：0.02%th, S：
0.023%th, Al：0.07%, surplus Fe, thickness 0.56mm.
(3) strip of (1) processing material and (2) selection is overmolding to φ 26mm core-spun yarns with core-spun yarn unit.
(4) (3) are processed into multielement nitro-alloy core-spun yarn and are used for pneumatic steelmaking, during liquid steel refining.
(5) converter of 220 tons of nominal capacity is selected, smelting steel grade is Q620D, and its refinery practice is：(a) converter terminal goes out
(liquid steel temperature controls at 1660~1680 DEG C steel；Molten steel composition controls：C：0.05~0.11%, P≤0.025%, S≤
0.020%th, O≤0.008%；In terminal tapping process, floating plug separates molten steel and bits made of refractory material, makes
Its slag is not flowed into ladle with molten steel；By the use of ferro-silico aluminium as deoxidier, oxygen is taken off to below 40ppm in steel；Use ferrosilicon
(75Si), ferromanganese (65Mn) and silicomangan (65Mn17Si) carry out molten steel alloying, right with graphite carburant (C >=98.5%)
Molten steel recarburization, (molten steel composition adjusts (b) liquid steel refining, makes its C：0.13~0.16%, Si：0.45~0.55%, Mn：1.65
~1.85, P≤0.025%, S≤0.020%, Al≤0.010%, liquid steel temperature adjustment make its temperature control 1590~1610
DEG C, and degassing is carried out molten steel, except the purification of molten steel refinery practice such as being mingled with, and make its steel grade (H, O) content be H≤4ppm, O
≤15ppm)；(c) (line feeding amount controls in 2.2kg/ts, wire-feeding velocity control refined molten steel feeding multielement nitro-alloy core-spun yarn
System is in 280m/min)；(d) refined molten steel carries out overall process Argon, and from steel before and after multielement nitro-alloy core-spun yarn is fed
Bag bottom by ventilated element made of refractory material be blown into argon-nitrogen mixture gas (wherein argon gas volume fraction be 35%, nitrogen
For 65%), mixed gas blowing time 9 divides 30 seconds, flow is controlled in 4.5M3/ min, make its liquid steel temperature and homogenization of composition,
And carry out measuring temp of molten steel and trimming：C：0.18%th, Si：0.35%th, Mn：2.0%th, V：0.11%th, B：0.009%th, Nb：
0.005%th, Ti：0.009%th, Al：0.010%th, N：0.012%th, P：0.023%th, S：0.019%)；(e) refined molten steel enters
Continuous casting workshop section casts strand (110mm × 1200mm).
(6) strand rolls
Control for Kiln Temperature is at 1250~1280 DEG C, and the heating and thermal insulation time is 4.5h, using cooling controlling and rolling controlling process, start rolling temperature
1030~1060 DEG C, secondary 900~920 DEG C of rolling temperature, 800~830 DEG C of finishing temperature.The rolling mill practice of the present embodiment is main
Be embodied in heating-up temperature specially and cooling controlling and rolling controlling process, after it is rolled denaturation every time, austenite occur repeat recrystallization and
Fully refined, the very disperse of multielement nitro-alloy, equably analysed on boundary of the austenite to ferritic transformation
Go out and effectively hinder the migration of austenite grain boundary, and effectively prevent ferrite crystal grain from growing up crystal grain thinning, it is strong so as to produce
Precipitation enhancement.The toughness plasticity of steel is improved simultaneously.
(7) rolled steel (14mm plates) performance detection, yield strength (Rel) are 679Mpa, and tensile strength (Rm) is
855Mpa, elongation (A) are 18.2%.
Welding performance is carried out to the Q620D shaped steel kind that the present embodiment is smelted, after welding, then carries out tension test, rheobase
This is constant, and sample stretching fracture is ductile fracture on the mother metal away from plumb joint.Welding crack sensibility index (Pcm) is
0.18%；The welding crack sensibility indices P cm of former technique is in 0.20~0.25% scope.The synthesis use cost of the present embodiment
31% is reduced than former process costs.
Multielement nitro-alloy in the present embodiment is prepared using following methods：
(1) select raw material, ferrosilicon, vanadium iron, ferromanganese, ferrotianium, ferrochrome, ferro-boron and ferro-niobium and be broken into respectively granularity≤
10mm；Then it is milled, its fine powder fineness≤0.15mm；The each component mass fraction of the vanadium iron of selection is V：75%, C：0.75%,
Si：2.5%, Al：3.0%, P：0.1%, S：0.08%, surplus is the inevitable impurity such as Fe and micro Ca, Mg；Ferrosilicon
Each component mass fraction is Si：72%, Mn：0.5%, Cr：0.5%, P：0.1%, S：0.1%, surplus be Fe and micro C, Al,
The inevitable impurity such as Ca, Mg；The each component mass fraction of ferrotianium is Ti：72%, Al：3.0%, Si：1.0%, P：
0.04%, S：0.03%, Mn：1.5%, C≤0.30%, surplus Fe；The each component mass fraction of ferromanganese is Mn：65%, Si：
3.7%, C：4.3%, P：0.13%, S：0.22%, surplus is the inevitable impurity such as Fe and micro Ca, Mg；Ferrochrome it is each
Constituent mass fraction is Cr：56%, C：0.7%, Si：1.9%, P：0.05%, S：0.03%, surplus Fe；The each group of ferro-boron
It is B to divide mass fraction：16%, C：1.7%, Si：6.2%, Al：0.9%, S：0.07%, P：0.09%, surplus Fe；Ferro-niobium
Each component mass fraction be Nb：51%, C：0.03%, Si：7.2%, Al：1.5%, S：0.02%, P：0.03%, surplus is
Fe；Above fraction is mass fraction.
(2) raw material fine powder that (1) processing obtains is matched, then plus 3% (mass fraction) bonding agent fully mixes
And it is more than 100Mpa pressure lower lock block in pressure with strength ball press；Bonding agent is by polyborosiloxane 27%, borax 21%, poly-
Resin 19%, carboxymethyl cellulose 17%, butyl stearate 7% and polyvinyl alcohol 9% form, and above fraction is quality point
Number；
(3) ball block made of (2) is put into vacuum drying oven and heated, control temperature is in the range of 680~750 DEG C, simultaneously
Ar gases are filled with burner hearth, pre-process 3h.
(4) block pre-processed is put into nitriding furnace and carries out nitrogen treatment, nitrogen is passed through during nitrogen treatment, controlled
System nitridation furnace pressure 0.15Mpa, in stove the first stage be warming up to 900~1000 DEG C, be incubated 4h, second stage is warming up to 1150
~1200 DEG C, 9h is incubated, the phase III is warming up to 1300~1350 DEG C, is incubated 6h, is heated to 1450~1530 DEG C, insulation
12h, last furnace cooling obtain composition to less than 300 DEG C：N：24.9%, V：33.2%, Si：18%, Mn：0.05%, Ti：
7.0%, Cr：1.8%, B：4.5%, Nb：1.6%, C：0.4%, P：0.10%, S：0.06%, surplus is Fe and trace impurity
Multielement nitro-alloy.
Claims (9)
1. a kind of multielement nitro-alloy core-spun yarn, including core and clad, it is characterised in that：Described core is multielement
Nitro-alloy, entered by more than three kinds materials in vanadium iron, ferrosilicon, metallic silicon, ferromanganese, manganese metal, ferrotianium, ferrochrome, ferro-boron and ferro-niobium
Row nitrogen treatment is prepared, and core includes consisting of composition：N：15.5~24.9%, V：27~48%, Si：18~
32%, Nb：0.3~4%, Mn：0.05~3%, B：0.3~4.5%, Ti：0.8~7.0%, Cr：0.1~5.0%, C≤
1.4%, P≤0.10%, S≤0.10%, surplus are Fe and inevitable impurity；V, B and Nb matter in described core component
The ratio for measuring fraction sum and N mass fractions is 1.69~2.71；Described clad is bright steel band.
A kind of 2. multielement nitro-alloy core-spun yarn according to claim 1, it is characterised in that：Described core is by particle diameter
It is made up of 0.01~4.5mm multielement nitro-alloy.
3. the answering in Q620D steel grade strengthening treatment process of the multielement nitro-alloy core-spun yarn described in claim 1 or 2
With.
4. application of the multielement nitro-alloy core-spun yarn in Q620D steel grade strengthening treatment process described in claim 3, it is walked
Suddenly it is：
1) converter terminal is tapped：Including thermometric, terminal constituent analysis, slag-stopping tapping, deoxidation of molten steel, molten steel alloying technology；
2) liquid steel refining：Molten steel composition and temperature are adjusted, and carries out molten steel degassing, except purification technique is mingled with, in liquid steel refining
During feed claim 1 or 2 described in multielement nitro-alloy core-spun yarn；
3) continuous casting：Refined molten steel is cast into strand；
4) strand rolls：Control for Kiln Temperature is at 1250~1290 DEG C, and the heating and thermal insulation time is 3.5~4.5h, using controlled rolling and controlled cooling work
Skill, 1030~1080 DEG C of start rolling temperature, secondary 900~935 DEG C of rolling temperature, 790~840 DEG C of finishing temperature.
5. application of the multielement nitro-alloy core-spun yarn according to claim 4 in Q620D steel grade strengthening treatment process,
It is characterized in that：Argon-nitrogen mixture gas are blown during liquid steel refining, wherein argon gas volume fraction is 20~50%, nitrogen volume
Fraction is 50~80%.
6. application of the multielement nitro-alloy core-spun yarn according to claim 4 in Q620D steel grade strengthening treatment process,
It is characterized in that：Temperature control is at 1590~1610 DEG C during liquid steel refining.
7. application of the multielement nitro-alloy core-spun yarn according to claim 4 in Q620D steel grade strengthening treatment process,
It is characterized in that：The wire-feeding velocity of multielement nitro-alloy core-spun yarn is 200~280m/min during liquid steel refining, line feeding amount
For 1.1~2.2kg/ts.
8. application of the multielement nitro-alloy core-spun yarn according to claim 4 in Q620D steel grade strengthening treatment process,
It is characterized in that：Adjustment molten steel composition in the step 2), makes the molten steel composition be：C：0.14~0.18%, Si：0.35~
0.60%, Mn：1.5~2.0%, V：0.07~0.11%, Nb：0.001~0.005%, Ti：0.004~0.009%, B：
0.003~0.009%, N：0.011~0.015%, P≤0.03%, S≤0.025%, Al≤0.01%.
9. application of the multielement nitro-alloy core-spun yarn according to claim 8 in Q620D steel grade strengthening treatment process,
It is characterized in that：H content control is controlled in≤15ppm in≤4ppm, O content in Q620D steel.
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| CN107955907A (en) * | 2017-11-30 | 2018-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel wire rod and its production method are built containing Nb, Cr microalloy |
| CN107747046A (en) * | 2017-11-30 | 2018-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel Bar and its production method are built containing V, Ti microalloy |
| CN107815603A (en) * | 2017-11-30 | 2018-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel Bar and its LF stove production methods are built containing V, Nb, Cr microalloy |
| CN107815609A (en) * | 2017-11-30 | 2018-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel Bar and its LF stove production methods are built containing Nb, Cr microalloy |
| CN107955903A (en) * | 2017-11-30 | 2018-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel bar and its production method are built containing V, Cr microalloy |
| CN107955915A (en) * | 2017-11-30 | 2018-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel bar and its LF stove production methods are built containing V, Ti microalloy |
| CN107815605A (en) * | 2017-11-30 | 2018-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel Bar and its production method are built containing V, Nb, Cr microalloy |
| CN107955910A (en) * | 2017-11-30 | 2018-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel bar and its LF stove production methods are built containing V, Nb, Ti microalloy |
| CN107955913A (en) * | 2017-11-30 | 2018-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel wire rod and its LF stove production methods are built containing V, Nb, Cr microalloy |
| CN108456817A (en) * | 2018-04-24 | 2018-08-28 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of nitro-alloy and preparation method thereof |
| RU2723863C1 (en) * | 2019-08-05 | 2020-06-17 | Общество с ограниченной ответственностью Новые перспективные продукты Технология | Wire with filler for out-of-furnace treatment of metallurgical melts |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103540865A (en) * | 2013-11-12 | 2014-01-29 | 湖南华菱湘潭钢铁有限公司 | Production method of tempered high-strength Q620D super-thick steel plate |
| CN103966396A (en) * | 2014-04-03 | 2014-08-06 | 陈来祥 | Compound nitrogen alloy core spun yarn and preparation method thereof |
| CN103981425A (en) * | 2014-05-30 | 2014-08-13 | 长沙东鑫环保材料有限责任公司 | Silicon-titanium-aluminum nitration material, and preparation method and application thereof |
-
2015
- 2015-12-24 CN CN201510998798.8A patent/CN105463159B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103540865A (en) * | 2013-11-12 | 2014-01-29 | 湖南华菱湘潭钢铁有限公司 | Production method of tempered high-strength Q620D super-thick steel plate |
| CN103966396A (en) * | 2014-04-03 | 2014-08-06 | 陈来祥 | Compound nitrogen alloy core spun yarn and preparation method thereof |
| CN103981425A (en) * | 2014-05-30 | 2014-08-13 | 长沙东鑫环保材料有限责任公司 | Silicon-titanium-aluminum nitration material, and preparation method and application thereof |
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