CN105463159A - Multi-element nitralloy cored wire and application method thereof in reinforcing treatment technique of Q620D steel - Google Patents
Multi-element nitralloy cored wire and application method thereof in reinforcing treatment technique of Q620D steel 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
Abstract
The invention discloses a multi-element nitralloy cored wire and an application method thereof in a reinforcing treatment technique of Q620D steel and belongs to the technical field of alloy material application. A wire core of the multi-element nitralloy cored wire comprises 15.5-24.9% of N, 27-48% of V, 18-32% of Si, 0.3-4% of Nb, 0.05-3% of Mn, 0.3-4.5% of B, 0.8-7.0% of Ti, 0.1-5.0% of Cr, 0-1.4% of C, 0-0.10% of P, 0-0.10% of S, and the balance Fe and trace impurities. According to the multi-element nitralloy cored wire and the application method thereof in the reinforcing treatment technique of the Q620D steel, multi-element nitralloy with the most proper components is designed and selected; beneficial elements are added, so that N is transferred to V, B and Nb easily, the V, B and Nb and N are combined easily, and positive correlation functions are achieved for steel performance reinforcement; the requirements of a microalloying reinforcing technique of the Q620D steel are completely meet, and the reinforcing effect of the multi-element nitralloy cored wire is brought into full play.
Description
Technical field
The invention belongs to alloy material applied technical field, more particularly, relate to a kind of multielement nitro-alloy cored-wire and the application method in Q620D steel grade strengthening treatment process thereof.
Background technology
Current production Q620D steel, for improving the performance index such as its intensity, normally use vanadium nitride (V:75 ~ 78%, N:12 ~ 16%) or ferrovanadium nitride (V:42 ~ 57%, N:9 ~ 14%) to carry out the expection of microalloying technique to molten steel and reach its enhancement purpose.Such as, Chinese Patent Application No. is 201310262303.6, and Shen Qing Publication day is that the patent application document on September 25th, 2013 discloses a kind of novel process of adding ferrovanadium nitride production structural low alloy steel, and step is as follows: (1) converter smelting; (2) LF refining; (3) continuous casting; (4) hot rolling, compared with the prior art this invention has the following advantages: 1, innovative design Q345B hot rolled strip chemical composition system, achieves reasonable component control techniques; Mn constituent content at least reduces by 0.45%, and add the V element of 0.015% ~ 0.030%, ton steel cost reduces further simultaneously; 2, replace conventional high manganese with ferrovanadium nitride microalloying, reduce the addition of alloying element, achieve minimizing and produce, better played refined crystalline strengthening and precipitation strength simultaneously.
The subject matter that aforesaid method exists and deficiency are: one: the effective rate of utilization of vanadium is low, only some V (accounting for 45 ~ 50%), form VN, VC with N, C and produce strengthening effect, a part of V is present in steel with the form of metal V, and does not have obvious strengthening effect; Two is that the processing method of adding is comparatively extensive, and be generally add with steel stream in molten steel tapping process, like this because liquid steel temperature is different, the molten steel band quantity of slag is different, the variable of the equal many factors of steel oxygen content in water and cause microalloying difference on effect very large; Three is that the physical condition of additive is inconsistent, and general nitro-alloy lumpiness is the composite grain of 5 ~ 60mm, makes the dynamic conditions in itself and molten steel fusion process unbalanced, and causes the difference of strengthening effect; Four is that its strengthening effect can not give full play to, and poor stability, causes cost to raise, and steel grade hit rate reduces.
Chinese Patent Application No. is 201210377151.X, Shen Qing Publication day is the cored-wire that the patent application document on December 19th, 2012 discloses a kind of metallurgy v n micro alloying and complex deoxidization, it includes core and coated steel band, its technical essential is: the core of cored-wire forms by increasing vanadium agent, nitrogen promoter and deoxidation nitrogen fixation agent three part, the granularity of each component is less than 6mm, and increasing vanadium agent is vanadium iron, ferrovanadium nitride or Vanadium Pentoxide in FLAKES; Nitrogen promoter is ferro-silicon nitride, nitrogenize silicomanganese, nitrided ferromanganese, nitrided ferro-chromium, silicon nitride, aluminium nitride or carbon CaCl2; Deoxidation nitrogen fixation agent is metallic aluminium, at least one in calcium, magnesium, barium or the alloy that is made up of them, also can include in titanium, zirconium, niobium, manganese, chromium, silicon, carbon and iron one or more, but this invention has the following disadvantages: (1) vanadium iron, ferrovanadium nitride, Vanadium Pentoxide in FLAKES are the diverse materials of its structures and characteristics, as V
2o
5be the oxide compound of V, adding in steel will become a kind of oxide inclusion and not play any strengthening effect to steel; (2) deoxidation nitrogen fixation agent is bundled into cored-wire with discrete particles shape and other material steel band, adding in molten steel process because of the fusing point of its each material and the difference of proportion, they almost combine less than together, wherein reductor preferential in steel oxygen be combined and form deoxidation products and become in steel and be mingled with.Chinese Patent Application No. is 201410131544.1, Shen Qing Publication day is that the patent application document on August 6th, 2014 discloses a kind of composite nitrogen alloy claded wire and preparation method thereof, this cored-wire is made up of inner core material and coating layer, inner core material is mixed by more than three kinds in vanadium iron, ferrovanadium nitride, vanadium nitride, ferro-silicon nitride, nitrogenize silicomanganese, nitrogenize ferrotianium, ferro-boron, nitrogenize ferro-boron, ferro-niobium and nitrogenize ferro-niobium, at least comprises nitride or the nitro-alloy of more than two kinds in inner core material; Coating layer is bright steel band, the preparation method of this cored-wire is: first prepare inner core material, the kind of nitrogen content on request, alloying element content and target steel grade is prepared burden, then carry out abrasive dust, mixing and granulation and make inner core material, then use bright steel band by coated for inner core material conglobate cored-wire; Viewed from technical progress aspect, this invention is carried out microalloying relative to single block nitro-alloy to molten steel and has really been strided forward major step, but the cored-wire nitrogenous source undersupply of this invention, not obvious to the strengthening effect of liquid steel refining.
Summary of the invention
1. the problem that will solve
The effective rate of utilization that there is vanadium for existing molten steel microalloying technique is low, strengthening effect can not give full play to, poor stability, high in cost of production problem, the invention provides a kind of multielement nitro-alloy cored-wire and the application method in Q620D steel grade strengthening treatment process thereof, the present invention designs the most suitable multielement nitro-alloy of screening composition, be added be beneficial to V, B, Nb transmit N and with its combination, Steel Properties has been strengthened to the beneficial element of positive correlation effect, as Si, Mn, Ti, Cr etc. simultaneously; The Composition Design of the multielement nitro-alloy of the present invention's screening extremely mates with the requirement of Q620D steel grade microalloying reinforcing process, not only ensure that the supply of N element fully but also taken into account the positive correlation of each alloying element, its strengthening effect is not fully exerted.
2. technical scheme
In order to solve the problem, the technical solution adopted in the present invention is as follows:
A kind of multielement nitro-alloy cored-wire, comprise core and coating layer, described core is multielement nitro-alloy, by vanadium iron, ferrosilicon, Pure Silicon Metal, ferromanganese, manganese metal, ferrotianium, ferrochrome, in ferro-boron and ferro-niobium, more than three kinds materials carry out nitriding treatment and prepare, core comprises following moiety: 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 is Fe and inevitable impurity, described coating layer is bright steel band.
Preferably, the multielement nitro-alloy that described core is 0.01 ~ 4.5mm by particle diameter is made.
Preferably, in described core component, the ratio of V, B and Nb massfraction sum and N massfraction is 1.69 ~ 2.71.
The above-mentioned application of multielement nitro-alloy cored-wire in Q620D steel grade strengthening treatment process.
The above-mentioned application method of multielement nitro-alloy cored-wire in Q620D steel grade strengthening treatment process, the steps include:
1) converter terminal tapping: comprise thermometric, terminal composition analysis, slag-stopping tapping, deoxidation of molten steel, molten steel alloying technology;
2) liquid steel refining: adjustment molten steel composition and temperature, and to molten steel carry out degassed, except being mingled with purification process, in the process of liquid steel refining, feed the multielement nitro-alloy cored-wire described in claim 1;
3) continuous casting: refined molten steel is cast strand;
4) strand rolling: Control for Kiln Temperature is at 1250 ~ 1290 DEG C, and the heating and thermal insulation time is 3.5 ~ 4.5h, adopts cooling controlling and rolling controlling process, start rolling temperature 1030 ~ 1080 DEG C, reroll temperature 900 ~ 935 DEG C, finishing temperature 790 ~ 840 DEG C.
Preferably, blow argon-nitrogen mixture gas in liquid steel refining process, wherein argon gas volume fraction is 20 ~ 50%, and nitrogen volume fraction is 50 ~ 80%.
Preferably, in liquid steel refining process, temperature controls at 1590 ~ 1610 DEG C.
Preferably, in liquid steel refining process, the wire-feeding velocity of multielement nitro-alloy cored-wire is 200 ~ 280m/min, and line feeding amount is 1.1 ~ 2.2kg/ts (1.1 ~ 2.2 kilograms of cored-wire/ton steel).
Preferably, described step 2) in adjustment molten steel composition, make 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, in Q620D steel, H content controls to control at≤15ppm at≤4ppm, O content.
Multielement nitro-alloy proposed by the invention is compared with the cored-wire in contrast patent 201410131544.1, its material immanent structure has difference in essence, multielement nitro-alloy be several alloying element simultaneously with nitrification and form nitro-alloy, the multielement nitro-alloy that the present invention relates to ensure that the supply of nitrogenous source and prioritizing selection V in molten steel microalloying process, B, the precious metal elements such as Nb, improve its strengthening effect in an optimal manner, the refinery practice of microalloying technique to molten steel involved in the present invention has new requirement, create best molten steel microalloying condition, increase substantially its strengthening effect and stability.
3. beneficial effect
Compared to prior art, beneficial effect of the present invention is:
(1) the present invention is directed to problems of the prior art, the most suitable multielement nitro-alloy of design screening composition, first (V+B+Nb)/N ratio (V is considered, the ratio of B and Nb tri-kinds of element massfraction sums and N massfraction), make its V, B, Nb is fully combined with N and plays its strengthening effect, in addition, the present invention be added be beneficial to V transmit N and with its combination, Steel Properties has been strengthened to the beneficial element of positive correlation effect simultaneously, as Si, Mn, Ti, Cr etc., again, the present invention's employing is different from existing processing method completely but a kind of new processing method carries out nitro-alloy microalloy treatment to molten steel,
(2) the V+B+Nb three constituent content sum that contrived experiment screening verification of the present invention is suitable is 1.69 ~ 2.71 with the ratio of N content, theoretic V/N ratio is 3.64 (namely V and N is fully formed the ratio of the required massfraction of both VN compounds), the V/N ratio of single vanadium nitride or ferrovanadium nitride is respectively 5.13 and 4.3, illustrate that its N content is inadequate, simultaneously because of the thermodynamic condition of molten steel and the impact of dynamic conditions, require that actual leaded wastewater is higher than theoretical leaded wastewater, so the present invention takes multielement nitro-alloy to ensure the supply of nitrogenous source; Alloying element is allowed to form nitride or nitrogen carbide fully, intergranular precipitation and crystal grain thinning, to reach best strengthening effect.
(3) the present invention designs the most much higher elemental nitrogen alloy of screening verification cost performance: 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 is Fe and trace impurity; The principle of this component concentration nitro-alloy selected: one is keep enough N content, its V, B, Nb are formed with N (C) chemical combination fully and separates out precipitation strength effect, two is the content adjusting Si, Cr, Mn, Ti element, reach suitable strengthening effect, the cost performance of its multielement nitro-alloy is maximized;
(4) multielement nitro-alloy is broken into 0.01 ~ 4.5mm granular and is overmolding to cored-wire by the present invention, accurately multielement nitro-alloy can be joined suitable molten steel deep makes nitro-alloy melt in the short period of time, design screening verification to the minimum microalloying technique of Steel Properties strengthening effect influence factor variable, to reach strengthening effect the most fully, the object such as technology stability is good, target steel grade hit rate is high;
(5) the present invention's complete reject prior art adds the technique of block nitro-alloy in tapping process, and design and create best liquid steel refining process, and in the mode of line feeding, multielement nitro-alloy is joined molten steel deep accurately, in line feeding process, be blown into argon-nitrogen mixture gas, processing condition required during strengthening multielement nitro-alloy microalloying further simultaneously; There is following superiority: one is ensure that the temperature, composition, oxygen level etc. of refined molten steel are stabilized in a suitable scope, two is that multielement nitro-alloy can fuse with molten steel under stable, a suitable thermodynamic condition and dynamic conditions, the molten steel refining technology of the present invention's innovation makes nitro-alloy strengthening effect abundant, technology stability is good, and target steel grade shoots straight;
(6) Composition Design of the multielement nitro-alloy of the present invention's screening extremely mates with the requirement of Q620D steel grade microalloying reinforcing process, not only ensure that the supply of N element fully but also taken into account the positive correlation of each alloying element, its strengthening effect is not fully exerted;
(7) present invention process stability obtains the embodiment given prominence to, and the stability of molten steel strengthening effect obtains the embodiment given prominence to, and the hit rate of steel grade target capabilities increases substantially, and reaches more than 99%; The present invention makes the utilization ratio of alloying element increase substantially, and technology stability and strengthening effect have good stability, and makes its comprehensive use cost can reduce by more than 26% compared with former technique;
(8) molten steel refining technology of the present invention ensure that refined molten steel temperature, uniform composition are stable, in steel, gas content (N, H, O) controls precisely, the deep of multielement nitro-alloy cored-wire to molten steel is added when reaching microalloying requirement completely, create the best thermodynamics and kinetics condition required for molten steel microalloying technique, avoid the impact that prior art adds fashionable factors variable in tapping process.
Embodiment
Below in conjunction with specific embodiment, the present invention is described further.
Embodiment 1
(1) select multielement nitro-alloy, 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 small-particle.
(2) select bright steel band, its composition is: C:0.06%, Si≤0.01%, Mn:0.035%, P:0.018%, S:0.021%, Al:0.06%, and surplus is Fe, and thickness is 0.75mm.
(3) (1) is added steel band cored-wire unit labor and materials and (2) selected and be overmolding to φ 13mm cored-wire.
(4) (3) are processed to form multielement nitro-alloy cored-wire in converter steel-smelting molten steel refining process.
(5) select the converter of nominal capacity 180 tons, smelting steel grade is Q620D, and its refinery practice is: (liquid steel temperature controls at 1660 ~ 1680 DEG C the tapping of (a) converter terminal; Molten steel composition controls: C:0.05 ~ 0.11%, P≤0.025%, S≤0.020%, O≤0.008%; In terminal tapping process, with the floating plug that refractory materials is made, molten steel is separated with bits, makes its slag not flow in ladle with molten steel; With Ca-Al alloy as reductor, in steel, oxygen takes off to below 40ppm; Molten steel alloying is carried out, with refinery coke carburelant (C >=98%) to molten steel recarburization with ferrosilicon (75Si), ferromanganese (65Mn) and silicomanganese (65Mn17Si); B (molten steel composition adjusts () liquid steel refining, make 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 makes its temperature control at 1590 ~ 1600 DEG C, and to molten steel carry out degassed, 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) refined molten steel feeding multielement nitro-alloy cored-wire (line feeding amount controls at 1.6kg/ts (i.e. 1.6 kilograms of cored-wire steel per ton), and wire-feeding velocity controls at 200m/min); D () refined molten steel carries out whole process Argon, and (wherein argon gas volume fraction is 20% to be blown into argon-nitrogen mixture gas from ladle bottom by the ventilated element that refractory materials is made before and after feeding multielement nitro-alloy cored-wire, nitrogen is 80%), 8 minutes mixed gas blowing times, flow control is at 4M
3/ min (makes its liquid steel temperature and homogenization of composition, and carry out measuring temp of molten steel and trimming: C:0.17%, Si:0.60%, Mn:1.5%, V:0.086%, Al:0.007%, N:0.015%, P:0.026%, S:0.020%, temperature: 1590 DEG C); E () refined molten steel enters continuous casting workshop section and casts strand (160mm × 1200mm).
(6) strand rolling
Control for Kiln Temperature is at 1250 ~ 1290 DEG C, and the heating and thermal insulation time is 4.0h, adopts cooling controlling and rolling controlling process, start rolling temperature 1030 ~ 1080 DEG C, reroll temperature 910 ~ 935 DEG C, finishing temperature 790 ~ 840 DEG C.The rolling technology of the present embodiment is mainly reflected in specific Heating temperature and cooling controlling and rolling controlling process, after making its each rolling sex change, austenite occurs repeat recrystallize and obtain abundant refinement, multielement nitro-alloy very disperse ground, separate out on the phase interface of austenite to ferritic transformation and effectively hinder the migration of austenite grain boundary equably, and effectively stop ferrite crystal grain to be grown up and crystal grain thinning, thus produce strong precipitation strength effect, improve the toughness plasticity of steel simultaneously.
(7) rolling stock (22mm plate) Performance Detection, yield strength (Rel) is 685Mpa, and tensile strength (Rm) is 881Mpa, and elongation (A) is 18.2%.
Carry out welding property test to the Q620D shaped steel that the present embodiment is smelted, after welding, then carry out tension test, intensity is substantially constant, and sample stretching fracture is all away from the mother metal of welding joint being ductile fracture.Welding crack sensibility index (Pcm) is 0.17%; The welding crack sensibility indices P cm of former technique is in 0.20 ~ 0.25% scope.The comprehensive use cost of the present embodiment reduces by 27% than former process costs.
Multielement nitro-alloy in the present embodiment adopts following method to prepare:
(1) select starting material, ferrosilicon, vanadium iron, manganese metal, ferrotianium, ferrochrome, ferro-boron and ferro-niobium are also broken into granularity≤10mm respectively; Then abrasive dust, its fine powder fineness≤0.15mm; Each constituent mass mark of the vanadium iron selected is V:75%, C:0.75%, Si:2.5%, Al:3.0%, P:0.1%, S:0.08%, and surplus is the inevitably impurity such as Fe and micro-Ca, Mg; Each constituent mass mark of ferrosilicon is Si:72%, Mn:0.5%, Cr:0.5%, P:0.1%, S:0.1%, and surplus is the inevitably impurity such as Fe and micro-C, Al, Ca, Mg; Each constituent mass mark of ferrotianium is Ti:72%, Al:3.0%, Si:1.0%, P:0.04%, S:0.03%, Mn:1.5%, C≤0.30%, and surplus is Fe; Each constituent mass mark of ferromanganese is: Mn:98.3%, Fe:1.1%, Si:0.3%, C:0.09%, P:0.03%, S:0.02%, and surplus is Fe and the inevitably impurity such as trace of Al, Ca, Mg; Each constituent mass mark of ferrochrome is Cr:52%, C:0.7%, Si:2.3%, P:0.04%, S:0.05%, and surplus is Fe; Each constituent mass mark of ferro-boron is B:19%, C:1.6%, Si:8.2%, Al:1.3%, S:0.07%, P:0.12%, and surplus is Fe; Each constituent mass mark of ferro-niobium is Nb:55%, C:0.04%, Si:7.2%, Al:1.3%, S:0.02%, P:0.03%, and surplus is Fe; Above mark is massfraction.
(2) (1) is processed the raw material fine powder obtained and carry out proportioning, then add 2% (massfraction) bonding agent and fully mix and be greater than the pressure block of 100Mpa with powerful ball press at pressure; Bonding agent is made up of polyborosiloxane 33%, borax 16%, polymer resin 21%, carboxymethyl cellulose 15%, butyl stearate 10% and polyvinyl alcohol 5%, and above mark is massfraction;
(3) vacuum oven heating put into by the ball block material (2) made, and control temperature, within the scope of 680 ~ 750 DEG C, is filled with Ar gas, pre-treatment 3h in burner hearth simultaneously.
(4) block material good for pre-treatment is put into nitriding furnace and carry out nitriding treatment, nitrogen is passed in nitriding treatment process, control nitriding furnace internal pressure 0.15Mpa, in stove, the first stage is warming up to 900 ~ 1000 DEG C, insulation 4h, subordinate phase is warming up to 1150 ~ 1200 DEG C, insulation 9h, phase III is warming up to 1300 ~ 1350 DEG C, insulation 6h, reheat 1450 ~ 1530 DEG C, insulation 12h, below last furnace cooling to 300 DEG C, obtain composition: 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 nitro-alloy of Fe and trace impurity.
Embodiment 2
(1) select multielement nitro-alloy, 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, is broken into 0.01 ~ 4.5mm small-particle.
(2) select bright steel band, its composition is: C:0.06%, Si≤0.01%, Mn:0.032%, P:0.02%, S:0.019%, Al:0.062%, and surplus is Fe, and thickness is 0.30mm.
(3) (1) is added band steel cored-wire unit labor and materials and (2) selected and be overmolding to φ 9mm cored-wire.
(4) (3) are processed into multielement nitro-alloy cored-wire for converter steelmaking, in liquid steel refining process.
(5) select the converter of nominal capacity 120 tons, smelting steel grade is Q620D, and its refinery practice is: (liquid steel temperature controls at 1660 ~ 1680 DEG C the tapping of (a) converter terminal; Molten steel composition controls: C:0.05 ~ 0.11%, P≤0.025%, S≤0.020%, O≤0.008%; In terminal tapping process, with the floating plug that refractory materials is made, molten steel is separated with bits, makes its slag not flow in ladle with molten steel; With Si-Al-Ba-Ca complex deoxidizer, in steel, oxygen takes off to below 40ppm; Molten steel alloying is carried out with ferrosilicon (75Si), ferromanganese (65Mn) and silicomanganese (65Mn17Si), with calcining coal carburelant (C >=93%) to molten steel recarburization, b (molten steel composition adjusts () liquid steel refining, make its C:0.12 ~ 0.17%, Si:0.40 ~ 0.55%, Mn:1.7 ~ 1.9%, P≤0.025%, S≤0.022%, Al:0.007 ~ 0.015%, liquid steel temperature adjustment makes its temperature control at 1590 ~ 1610 DEG C, and to molten steel carry out degassed, except the purification of molten steel refinery practice such as being mingled with.And make its steel grade (H, O) content be H≤4ppmm, O≤15ppm); (c) refined molten steel feeding multielement nitro-alloy cored-wire (line feeding amount controls at 1.1kg/ts, and wire-feeding velocity controls at 220m/min); D () refined molten steel carries out whole process Argon, and before and after feeding multielement nitro-alloy cored-wire, being blown into argon-nitrogen mixture gas from ladle bottom by the ventilated element that refractory materials is made, (Ar gas volume fraction is 50%, N
2gas volume fraction is 50%), 11 minutes mixed gas blowing times, flow control is at 5M
3/ min, (make its liquid steel temperature and homogenization of composition, and carry out measuring temp of molten steel and trimming: C:0.14%, Si:0.55%, Mn:1.73%, V:0.07%, Cr:0.006%, Ti:0.004%, Al:0.009%, B:0.003%, Nb:0.001%, N:0.011%, P:0.025%, S:0.021%, temperature: 1590 DEG C); E () refined molten steel enters continuous casting workshop section and casts strand (100mm × 1200mm).
(6) strand rolling
Control for Kiln Temperature is at 1250 ~ 1290 DEG C, and the heating and thermal insulation time is 3.5h, adopts cooling controlling and rolling controlling process, start rolling temperature 1030 ~ 1070 DEG C, reroll temperature 900 ~ 930 DEG C, finishing temperature 790 ~ 830 DEG C.The rolling technology of the present embodiment is mainly reflected in specific Heating temperature and cooling controlling and rolling controlling process, after making its each rolling sex change, austenite occurs repeat recrystallize and obtain abundant refinement, multielement nitro-alloy very disperse ground, separate out on the phase interface of austenite to ferritic transformation and effectively hinder the migration of austenite grain boundary and effectively stop ferrite crystal grain to be grown up and crystal grain thinning equably, thus produce strong precipitation strength effect, improve the toughness plasticity of steel simultaneously.
(7) rolling stock (10mm plate) Performance Detection, yield strength (Rel) is 693Mpa, and tensile strength (Rm) is 869Mpa, and unit elongation (Agt) is 19.3%.
Carry out welding property to the Q620D shaped steel kind that the present embodiment is smelted, after welding, then carry out tension test, intensity is substantially constant, and sample stretching fracture is all away from the mother metal of welding joint being ductile fracture.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 comprehensive use cost of the present embodiment reduces by 26% than former process costs.
Multielement nitro-alloy in the present embodiment adopts following method to prepare:
(1) select starting material, ferrosilicon, vanadium iron, ferromanganese, ferrotianium, ferrochrome, ferro-boron and ferro-niobium are also broken into granularity≤10mm respectively; Then abrasive dust, its fine powder fineness≤0.15mm; Each constituent mass mark of the vanadium iron selected is V:75%, C:0.75%, Si:2.5%, Al:3.0%, P:0.1%, S:0.08%, and surplus is the inevitably impurity such as Fe and micro-Ca, Mg; Each constituent mass mark of ferrosilicon is Si:72%, Mn:0.5%, Cr:0.5%, P:0.1%, S:0.1%, and surplus is the inevitably impurity such as Fe and micro-C, Al, Ca, Mg; Each constituent mass mark of ferrotianium is Ti:72%, Al:3.0%, Si:1.0%, P:0.04%, S:0.03%, Mn:1.5%, C≤0.30%, and surplus is Fe; Each constituent mass mark of ferromanganese is Mn:65%, Si:3.3%, C:3.9%, P:0.16%, S:0.19%, and surplus is the inevitably impurity such as Fe and micro-Ca, Mg; Each constituent mass mark of ferrochrome is Cr:60%, C:0.8%, Si:2.1%, P:0.05%, S:0.03%, and surplus is Fe; Each constituent mass mark of ferro-boron is B:17%, C:2.3%, Si:6.7%, Al:1.4%, S:0.06%, P:0.11%, and surplus is Fe; Each constituent mass mark of ferro-niobium is Nb:48%, C:0.04%, Si:8.3%, Al:0.8%, S:0.02%, P:0.03%, and surplus is Fe.Above mark is massfraction.
(2) (1) is processed the raw material fine powder obtained and carry out proportioning, then add 2.5% (massfraction) bonding agent and fully mix and be greater than the pressure block of 100Mpa with powerful ball press at pressure; Bonding agent is made up of polyborosiloxane 31%, borax 19%, polymer resin 24%, carboxymethyl cellulose 11%, butyl stearate 9% and polyvinyl alcohol 6%, and above mark is massfraction;
(3) vacuum oven heating put into by the ball block material (2) made, and control temperature, within the scope of 680 ~ 750 DEG C, is filled with Ar gas, pre-treatment 3h in burner hearth simultaneously.
(4) block material good for pre-treatment is put into nitriding furnace and carry out nitriding treatment, nitrogen is passed in nitriding treatment process, control nitriding furnace internal pressure 0.15Mpa, in stove, the first stage is warming up to 900 ~ 1000 DEG C, insulation 4h, subordinate phase is warming up to 1150 ~ 1200 DEG C, insulation 9h, phase III is warming up to 1300 ~ 1350 DEG C, insulation 6h, reheat 1450 ~ 1530 DEG C, insulation 12h, below last furnace cooling to 300 DEG C, obtain composition: 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 the multielement nitro-alloy of Fe and trace impurity.
Embodiment 3
(1) select multielement nitro-alloy, its composition is: 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, is broken into 0.01 ~ 4.5mm small-particle.Above mark is massfraction.
(2) select bright steel band, its composition is: C:0.07%, Si≤0.01%, Mn:0.03%, P:0.02%, S:0.023%, Al:0.07%, and surplus is Fe, and thickness is 0.56mm.
(3) (1) is added band steel cored-wire unit labor and materials and (2) selected and be overmolding to φ 26mm cored-wire.
(4) (3) are processed into multielement nitro-alloy cored-wire for converter steelmaking, in liquid steel refining process.
(5) select the converter of nominal capacity 220 tons, smelting steel grade is Q620D, and its refinery practice is: (liquid steel temperature controls at 1660 ~ 1680 DEG C the tapping of (a) converter terminal, molten steel composition controls: C:0.05 ~ 0.11%, P≤0.025%, S≤0.020%, O≤0.008%, in terminal tapping process, with the floating plug that refractory materials is made, molten steel is separated with bits, makes its slag not flow in ladle with molten steel, with ferrosilicoaluminum as reductor, in steel, oxygen takes off to below 40ppm, with ferrosilicon (75Si), ferromanganese (65Mn) and silicomanganese (65Mn17Si) carry out molten steel alloying, with graphite carburelant (C>=98.5%) to molten steel recarburization, b (molten steel composition adjusts () liquid steel refining, make 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 makes its temperature control at 1590 ~ 1610 DEG C, and carry out degassed to molten steel, except the purification of molten steel refinery practice such as being mingled with, and make its steel grade (H, O) content is H≤4ppm, O≤15ppm), (c) refined molten steel feeding multielement nitro-alloy cored-wire (line feeding amount controls at 2.2kg/ts, and wire-feeding velocity controls at 280m/min), d () refined molten steel carries out whole process Argon, and (wherein argon gas volume fraction is 35% to be blown into argon-nitrogen mixture gas from ladle bottom by the ventilated element that refractory materials is made before and after feeding multielement nitro-alloy cored-wire, nitrogen is 65%), 30 seconds mixed gas blowing times 9 points, flow control is at 4.5M
3/ min, make its liquid steel temperature and homogenization of composition, and carry out measuring temp of molten steel and trimming: C:0.18%, Si:0.35%, Mn:2.0%, V:0.11%, B:0.009%, Nb:0.005%, Ti:0.009%, Al:0.010%, N:0.012%, P:0.023%, S:0.019%), e () refined molten steel enters continuous casting workshop section and casts strand (110mm × 1200mm).
(6) strand rolling
Control for Kiln Temperature is at 1250 ~ 1280 DEG C, and the heating and thermal insulation time is 4.5h, adopts cooling controlling and rolling controlling process, start rolling temperature 1030 ~ 1060 DEG C, reroll temperature 900 ~ 920 DEG C, finishing temperature 800 ~ 830 DEG C.The rolling technology of the present embodiment is mainly reflected in Heating temperature specially and cooling controlling and rolling controlling process, after making its each rolling sex change, austenite occurs repeat recrystallize and obtain abundant refinement, multielement nitro-alloy very disperse ground, separate out on the phase interface of austenite to ferritic transformation and effectively hinder the migration of austenite grain boundary equably, the crystal grain thinning and effective prevention ferrite crystal grain is grown up, thus produce strong precipitation strength effect.Improve the toughness plasticity of steel simultaneously.
(7) rolling stock (14mm plate) Performance Detection, yield strength (Rel) is 679Mpa, and tensile strength (Rm) is 855Mpa, and elongation (A) is 18.2%.
Carry out welding property to the Q620D shaped steel kind that the present embodiment is smelted, after welding, then carry out tension test, intensity is substantially constant, and sample stretching fracture is all away from the mother metal of welding joint being ductile fracture.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 comprehensive use cost of the present embodiment reduces by 31% than former process costs.
Multielement nitro-alloy in the present embodiment adopts following method to prepare:
(1) select starting material, ferrosilicon, vanadium iron, ferromanganese, ferrotianium, ferrochrome, ferro-boron and ferro-niobium are also broken into granularity≤10mm respectively; Then abrasive dust, its fine powder fineness≤0.15mm; Each constituent mass mark of the vanadium iron selected is V:75%, C:0.75%, Si:2.5%, Al:3.0%, P:0.1%, S:0.08%, and surplus is the inevitably impurity such as Fe and micro-Ca, Mg; Each constituent mass mark of ferrosilicon is Si:72%, Mn:0.5%, Cr:0.5%, P:0.1%, S:0.1%, and surplus is the inevitably impurity such as Fe and micro-C, Al, Ca, Mg; Each constituent mass mark of ferrotianium is Ti:72%, Al:3.0%, Si:1.0%, P:0.04%, S:0.03%, Mn:1.5%, C≤0.30%, and surplus is Fe; Each constituent mass mark of ferromanganese is Mn:65%, Si:3.7%, C:4.3%, P:0.13%, S:0.22%, and surplus is the inevitably impurity such as Fe and micro-Ca, Mg; Each constituent mass mark of ferrochrome is Cr:56%, C:0.7%, Si:1.9%, P:0.05%, S:0.03%, and surplus is Fe; Each constituent mass mark of ferro-boron is B:16%, C:1.7%, Si:6.2%, Al:0.9%, S:0.07%, P:0.09%, and surplus is Fe; Each constituent mass mark of ferro-niobium is Nb:51%, C:0.03%, Si:7.2%, Al:1.5%, S:0.02%, P:0.03%, and surplus is Fe; Above mark is massfraction.
(2) (1) is processed the raw material fine powder obtained and carry out proportioning, then add 3% (massfraction) bonding agent and fully mix and be greater than the pressure block of 100Mpa with powerful ball press at pressure; Bonding agent is made up of polyborosiloxane 27%, borax 21%, polymer resin 19%, carboxymethyl cellulose 17%, butyl stearate 7% and polyvinyl alcohol 9%, and above mark is massfraction;
(3) vacuum oven heating put into by the ball block material (2) made, and control temperature, within the scope of 680 ~ 750 DEG C, is filled with Ar gas, pre-treatment 3h in burner hearth simultaneously.
(4) block material good for pre-treatment is put into nitriding furnace and carry out nitriding treatment, nitrogen is passed in nitriding treatment process, control nitriding furnace internal pressure 0.15Mpa, in stove, the first stage is warming up to 900 ~ 1000 DEG C, insulation 4h, subordinate phase is warming up to 1150 ~ 1200 DEG C, insulation 9h, phase III is warming up to 1300 ~ 1350 DEG C, insulation 6h, reheat 1450 ~ 1530 DEG C, insulation 12h, below last furnace cooling to 300 DEG C, obtain composition: 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 the multielement nitro-alloy of Fe and trace impurity.
Claims (10)
1. a multielement nitro-alloy cored-wire, comprise core and coating layer, it is characterized in that: described core is multielement nitro-alloy, by vanadium iron, ferrosilicon, Pure Silicon Metal, ferromanganese, manganese metal, ferrotianium, ferrochrome, in ferro-boron and ferro-niobium, more than three kinds materials carry out nitriding treatment and prepare, core comprises following moiety: 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 is Fe and inevitable impurity, described coating layer is bright steel band.
2. a kind of multielement nitro-alloy cored-wire according to claim 1, is characterized in that: the multielement nitro-alloy that described core is 0.01 ~ 4.5mm by particle diameter is made.
3. a kind of multielement nitro-alloy cored-wire according to claim 1, is characterized in that: in described core component, the ratio of V, B and Nb massfraction sum and N massfraction is 1.69 ~ 2.71.
4. claim 1 or the application of multielement nitro-alloy cored-wire in Q620D steel grade strengthening treatment process described in 2 or 3.
5. the application method of multielement nitro-alloy cored-wire according to claim 4 in Q620D steel grade strengthening treatment process, the steps include:
1) converter terminal tapping: comprise thermometric, terminal composition analysis, slag-stopping tapping, deoxidation of molten steel, molten steel alloying technology;
2) liquid steel refining: adjustment molten steel composition and temperature, and to molten steel carry out degassed, except being mingled with purification process, in the process of liquid steel refining, feed the multielement nitro-alloy cored-wire described in claim 1;
3) continuous casting: refined molten steel is cast strand;
4) strand rolling: Control for Kiln Temperature is at 1250 ~ 1290 DEG C, and the heating and thermal insulation time is 3.5 ~ 4.5h, adopts cooling controlling and rolling controlling process, start rolling temperature 1030 ~ 1080 DEG C, reroll temperature 900 ~ 935 DEG C, finishing temperature 790 ~ 840 DEG C.
6. the application method of multielement nitro-alloy cored-wire according to claim 5 in Q620D steel grade strengthening treatment process, it is characterized in that: in liquid steel refining process, blow argon-nitrogen mixture gas, wherein argon gas volume fraction is 20 ~ 50%, and nitrogen volume fraction is 50 ~ 80%.
7. the application method of multielement nitro-alloy cored-wire according to claim 5 in Q620D steel grade strengthening treatment process, is characterized in that: in liquid steel refining process, temperature controls at 1590 ~ 1610 DEG C.
8. the application method of multielement nitro-alloy cored-wire according to claim 5 in Q620D steel grade strengthening treatment process, it is characterized in that: in liquid steel refining process, the wire-feeding velocity of multielement nitro-alloy cored-wire is 200 ~ 280m/min, line feeding amount is 1.1 ~ 2.2kg/ts.
9. the application method of multielement nitro-alloy cored-wire according to claim 5 in Q620D steel grade strengthening treatment process, it is characterized in that: described step 2) middle adjustment molten steel composition, molten steel composition is made to 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%.
10. the application method of multielement nitro-alloy cored-wire according to claim 9 in Q620D steel grade strengthening treatment process: it is characterized in that: in Q620D steel, H content controls to control at≤15ppm at≤4ppm, O content.
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| 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 |
| 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 |
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