CN102304604A - Smelting technology of III grade hot-rolled ribbed bars - Google Patents
Smelting technology of III grade hot-rolled ribbed bars Download PDFInfo
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Abstract
The invention relates to a smelting technology of III grade hot-rolled ribbed bars. The invention belongs to the technical field of steel smelting. The technical scheme of the invention is that: vanadium-containing molten iron is adopted as a raw material; a vanadium increasing process in a bar production procedure is divided into two steps that: first, during a steel producing procedure, vanadium slag extracted from the vanadium-containing molten iron is added, and vanadium elements are reduced and added into molten steel, such that first-step vanadium increasing is carried out; second, when steel is discharged from a converter, vanadium-containing molten iron is directly poured into the ladle, such that second-step vanadium increasing is carried out. During the process, the vanadium elements in the vanadium-containing molten iron are directly converted into the vanadium elements in the vanadium-containing molten steel. The vanadium alloyed raw materials (the vanadium slag and the vanadium-containing molten iron) are internal materials sourced from a steel refinery. With the composite vanadium increasing method, a problem of high cost in the production process of the III grade hot-rolled ribbed bars is solved. The produced ribbed bars satisfy both the performance requirement and the shock resistance requirement. With the method, direct and highly efficient utilization of rare resources is realized, the technology process is reduced, the production efficiency is improved, and the production cost is reduced.
Description
Technical field
The present invention relates to a kind of smelting technology of III level hot-rolled screw thread reinforcing bar; Particularly do not add any vanadium alloy in process of production and all use in vanadium slag and the vanadium-bearing hot metal v element and carry out vanadium alloying and smelt III level hot-rolled screw thread reinforcing bar technology, belong to metallurgical steelmaking technical field.
Background technology
The hot-rolled screw thread reinforcing bar is widely used in building field, generally is divided into ranks such as II level, III level, IV level, i.e. ranks such as HRB335, HRB400, HRB500 by its intensity height.At present, it is superseded that the II Twisted Steel is tending towards gradually, and III level Twisted Steel share of market is constantly soaring, and the ⅣJi Gang muscle is not also generally promoted at present.In III level Twisted Steel, the reinforcing bar with anti-seismic performance enjoys favor, and III level antidetonation Twisted Steel more and more receives user's attention with its superior anti-seismic performance, and usage quantity is in continuous rising.Compare with regular reinforcement; Anti-seismic steel bar except that satisfying the used performance index of regular reinforcement, the ratio (being strong flexor ratio) that also need satisfy actual measurement tensile strength and actual measurement ys eigenwert is not less than 1.25, the actual measurement ys be not more than 1.30 with the ratio of the ys eigenwert of standard code (promptly bend mark than), the maximum percentage of total elongation of reinforcing bar is not less than 9% 3 condition and just can be judged to be anti-seismic steel bar.For realizing the especially production of anti-seismic steel bar of III grade reinforcing steel; The metallargist is through big quantity research; Developed the method for multiple production reinforcing bar; But common way is on the basis of II Twisted Steel, to add elements such as V, Nb and make reinforcing bar satisfy its performance requriements through composition optimization; And the interpolation of elements such as V, Nb mainly relies on vanadium iron, VN alloy and ferro-niobium to carry out microalloying, and wherein most of reinforcing bar all adopts the mode of vanadium alloying to produce, and vanadium alloy mainly relies on ferro-vanadium and VN alloy in the converter tapping process, to add to increase vanadium.Rely on vanadium alloy to increase vanadium; Mainly there is the high problem of alloying cost; Want outer the corporate boss who does not have vanadium and titanium resources and purchase expensive vanadium alloy production, and can use self-produced vanadium alloy production, but the production of vanadium alloy need be produced vanadium alloy through the vanadium chemical plant by vanadium slag and returned steelworks again and use in the enterprise that has vanadium and titanium resources; Technical process is long, and vanadium slag loss in the process of producing vanadium alloy is bigger.Therefore, in the process of production III grade reinforcing steel, how guaranteeing reinforcement property especially its anti-seismic performance qualification rate and reduction reinforcing bar production cost, is that one of technical problem that solves is badly in need of in iron and steel enterprise, also is the important channel that economizes on resources.
Summary of the invention
The object of the invention provides a kind of smelting technology of III level hot-rolled screw thread reinforcing bar; Do not add any vanadium alloy and all use in vanadium slag and the vanadium-bearing hot metal v element and carry out vanadium alloying and increase vanadium; The Twisted Steel of being produced not only satisfies performance requriements and has also satisfied the shockproof requirements of reinforcing bar simultaneously, and has reduced production cost significantly, has fully efficiently utilized vanadium and titanium resources; Reduce the loss of resource, solved the problems referred to above that background technology exists.
Technical scheme of the present invention is:
A kind of smelting technology of III level hot-rolled screw thread reinforcing bar comprises following process step:
A. vanadium-bearing hot metal is at first handled through vanadium extraction, carries out magnetic separation, fragmentation inside after the vanadium slag cooling that vanadium extraction obtains after handling, and broken back granularity is the 5-40mm size, and with using the alloy material feed bin to converter steelmaking on the vanadium slag;
B. the half steel that obtains after the vanadium-bearing hot metal vanadium extraction is blended into steel-making converter and blows, and when terminal point composition weight percent meets C≤0.15%, S≤0.040%, P≤0.025%, carries out tapping steel;
C. carry out in the tapping process having calculated and carry out the deoxidation alloying operation behind the alloy addition according to the specification of smelting reinforcing bar; The alloy material addition sequence is: vanadium slag-reductive agent-silicomanganese-particle lime-slag supplying agent, and above material all places in the alloy truck, and tapping process evenly adds; Reductor normally adds; Carry out on-line argon-blow gas or nitrogen in the tapping process, guarantee that slag charge fully melts, accomplish the first step through this step and increase vanadium;
D. the pushing off the slag tapping is implemented in converter, will calculate good vanadium-bearing hot metal after the tapping and pour in the ladle, converts in the iron process ladle and implements online blowing argon gas or nitrogen, accomplishes second through this step and goes on foot and increase vanadium;
E. after accomplishing the vanadium alloying operation, molten steel further carries out Argon, the refining of LF stove or CAS-OB refining treatment, and assurance composition, the qualified back of temperature are gone up continuous casting and poured into a mould, and are rolled then;
The chemical component weight per-cent of the III level hot-rolled screw thread reinforcing bar of f. producing as stated above is following: C:0.20-0.25%; Si:0.20-0.80%; Mn:1.20-1.60%; P :≤0.045%; S :≤0.045%; V:0.010-0.060%, production specification are that nominal diameter is a ∮ 6mm-∮ 40mm specification.
Among the said step a, be used for the vanadium slag V of alloying
2O
5Weight percent should be not less than 12.5%, i.e. oxide compound V in the vanadium slag
2O
5The ratio of weight and vanadium slag weight is not less than 12.5%, calculates its add-on according to the steel grade specification.
Among the said step c, reductive agent is a kind of of ferrosilicon powder, silicon calcium powder or aluminium powder, and add-on is a 0.5-2kg/ ton steel; Reductor is a kind of in sial barium, aluminium manganese calcium magnesium, sial barium strontium, ferrosilicoaluminum, ferro-aluminum, the Si-Al-Ca-Ba, and add-on is a 0.2-1.5kg/ ton steel.
Among the said step c, the CaO content weight percent of particle lime is not less than 80%, SiO
2The content weight percent is not more than 3%, and P, S content weight percent are not more than 0.080%, and activity degree is not less than 250ml, and globule size is 5-30mm, and the particle lime adding amount is a 3-8kg/ ton steel.
Among the said step c, slag supplying agent is not for containing the slag supplying agent of CaF, and selecting high basicity calcium aluminate for use is slag supplying agent, and its composition scope weight percent is: CaO:40-60%, Al
2O
3: 20-50%, SiO
2≤10%, all the other are impurity, and its add-on is the 1/4-1/2 of particle lime adding amount.
Among said step c and the d, argon gas and nitrogen air supply intensity are the 2-6L/mint steel.
Among the said step e; Vanadium-bearing hot metal composition weight percent is: C>=3.80%, V>=0.250%, P≤0.120%, S≤0.080%; All the other are Fe and other element, and temperature is not less than 1250 ℃, and the tapping back increases the vanadium amount according to vanadium slag and will calculate in the good iron water amount adding ladle.
Principle of work of the present invention:
A. the present invention is directed to the problem that adopts the vanadium alloy microalloying to exist; In III grade reinforcing steel production process, do not add any vanadium alloy and all use in vanadium slag and the vanadium-bearing hot metal v element and carry out vanadium alloying and increase vanadium; Use this built-up type and increase the vanadium mode, utilize the strengthening effect of v element in reinforcing bar, improved the intensity of reinforcing bar; Twisted Steel through the production of optimized composition designing institute not only satisfies the shockproof requirements that performance requriements has also satisfied reinforcing bar simultaneously simultaneously; And reduced production cost significantly, and fully efficiently utilized vanadium and titanium resources, reduced the loss of resource; Not only realized the cost efficiency of enterprise, and opened up new approach for the comprehensive high-efficiency utilization of vanadium titanium scarce resource;
The smelting technology method of b. above-mentioned III level hot-rolled screw thread reinforcing bar is utilized vanadium slag to increase vanadium and in tapping process, is added reductive agent and small-particle lime act as and promotes that the barium oxide reduction gets in the molten steel in the vanadium slag, mainly realizes through following reaction: 2V
2O
5+ 5Si=4V+5SiO
23V
2O
5+ 10Al=6V+5 Al
2O
3More than be reflected under the situation of CaO existence, the basicity that improves slag can promote the reduction ratio of vanadium, has protected ladle liner simultaneously.Utilize v element in the molten iron directly v element to be converted into the v element in the molten steel and directly utilize, utilization ratio is higher;
Why the smelting technology method of c. above-mentioned III level hot-rolled screw thread reinforcing bar takes built-up type to increase the vanadium mode, is mainly certain material of single use and has certain drawback.Remove in the vanadium slag and contain V
2O
5Also there is SiO outward
2, oxide compounds such as FeO, MnO, the existence of these oxide compounds has weakened basicity of slag and has strengthened molten steel and slag oxidation property,, especially produce big specification reinforcing bar requirement V content when higher, excessive deoxidation cost and the slag making cost of making of vanadium slag add-on rises.Though vanadium-bearing hot metal increases the process that vanadium does not exist deoxidation and slag making, its temperature is relatively low, and reinforcing bar production crosses and claim to receive the restriction of C content can not add too much, therefore also should not all use the molten iron alloying.This invention uses its combination to increase the vanadium mode, makes that the two add-on is suitable when V content meets the steel grade requirement satisfying, and has solved the drawback that the above-mentioned material of single use increases vanadium, has played good effect;
The smelting technology method of d. above-mentioned III level hot-rolled screw thread reinforcing bar; Vanadium alloying raw material (vanadium slag and vanadium-bearing hot metal) all derives from the steelworks materials inside, and vanadium slag only needs in factory, to become satisfactory granularity through simple crushing, and molten iron can directly carry out alloying; The direct utilization and efficient utilization of scarce resource have been realized; Shortened technical process, production efficiency improves, and has reduced production cost simultaneously.
The present invention compares with background technology, and its beneficial effect is:
A. in III level Twisted Steel production process, do not add any vanadium alloy and all use in vanadium slag and the vanadium-bearing hot metal v element and carry out vanadium alloying and increase vanadium; Both utilized the strengthening effect of v element to reinforcement property; Satisfy its performance requriements, satisfied the shockproof requirements of reinforcing bar simultaneously again.Producing nominal diameter is in the III level hot-rolled screw thread reinforcing bar of ∮ 6mm-∮ 40mm specification, when reinforcing bar chemical component weight per-cent is: C:0.20-0.25%; Si:0.20-0.80%; Mn:1.20-1.60%; P :≤0.045%; S :≤0.045%; V:0.010-0.060%, the Twisted Steel of being produced as stated above all satisfies shockproof requirements;
B. use this built-up type and increase the vanadium mode, make that the two add-on is suitable when V content meets the steel grade requirement satisfying, solved the drawback that the above-mentioned material of single use increases vanadium, played good effect;
C. vanadium alloying raw material (vanadium slag and vanadium-bearing hot metal) all derives from the steelworks materials inside, has realized the direct utilization and efficient utilization of scarce resource, simplifies and shortened technical process, and production efficiency improves, and production cost has obtained reduction.
Description of drawings
Fig. 1 is an embodiment of the invention process flow sheet.
Embodiment
The present invention is applicable to that to smelt vanadium-bearing hot metal be the main iron and steel enterprise that adopts vanadium extraction-steel-making duplex production technique.With 100 tons of converter systems is example; Steelshop is arranged three block converters in converter bay; Wherein one is used for vanadium extraction; Other two are used for steel-making, and the III level hot-rolled screw thread reinforcing bar nominal diameter of being produced is ∮ 6mm-∮ 40mm, according to different size reinforcing bar chemical component weight per-cent is: C:0.20-0.25%; Si:0.20-0.80%; Mn:1.20-1.60%; P :≤0.045%; S :≤0.045%; V:0.010-0.060%.Using vanadium slag and vanadium-bearing hot metal to increase the vanadium amount is respectively: the vanadium slag add-on is controlled at 2-8kg/ ton steel; It increases vanadium amount weight percent and is controlled at 0.015%-0.050% (being that vanadium slag gets into V element weight and the ratio of molten steel weight in the molten steel); The vanadium-bearing hot metal add-on is controlled at 10-40kg/ ton steel, and it increases vanadium amount weight percent and is controlled at 0.003-0.015% (being that vanadium-bearing hot metal gets into V element weight and the ratio of molten steel weight in the molten steel).
After utilization the inventive method, its embodiment mainly realizes through following steps:
A. vanadium-bearing hot metal is at first handled through vanadium extraction, and the vanadium slag that vanadium extraction obtains after handling is chosen V
2O
5It (is oxide compound V in the vanadium slag that weight percent is not less than 12.5%
2O
5The ratio of weight and vanadium slag weight) carry out magnetic separation, fragmentation inside after the cooling of part, broken back granularity is the 5-40mm size, and with using the alloy material feed bin to converter steelmaking on the vanadium slag;
B. the half steel that obtains after the vanadium-bearing hot metal vanadium extraction is blended into steel-making converter and blows, and when terminal point meets (% is weight percentage) C≤0.15%, S≤0.040%, P≤0.025%, carries out tapping steel;
C. carry out in the tapping process having calculated and carry out the deoxidation alloying operation behind the alloy addition according to refining anti-seismic steel bar specification; The alloy material addition sequence is: vanadium slag-reductive agent-silicomanganese-particle lime-slag supplying agent, and above material all places in the alloy truck, and tapping process evenly adds; Reductor normally adds; Carry out on-line argon-blow gas or nitrogen in the tapping process, guarantee that slag charge fully melts, accomplish the first step through this step and increase vanadium.Wherein: reductive agent is a kind of of ferrosilicon powder, silicon calcium powder or aluminium powder, and add-on is a 0.5-2kg/ ton steel; Reductor is that sial barium, aluminium manganese calcium magnesium, sial barium strontium, ferrosilicoaluminum, ferro-aluminum, Si-Al-Ca-Ba contain a kind of in the aluminium deoxidizer, and add-on is a 0.2-1.5kg/ ton steel; Its CaO content weight percent of particle lime is not less than 80%, SiO
2The content weight percent is not more than 3%, and P, S content weight percent are not more than 0.080%, and activity degree is not less than 250ml, and globule size is 5-30mm, and add-on is a 3-8kg/ ton steel.Used slag supplying agent is not for containing the slag supplying agent of CaF, and generally selecting high basicity calcium aluminate for use is slag supplying agent, and its composition scope weight percent is: CaO:40-60%, Al
2O
3: 20-50%, SiO
2≤10%, all the other are impurity, and its add-on is the 1/4-1/2 of particle lime adding amount, and argon gas and nitrogen air supply intensity are the 2-6L/mint steel;
D. the pushing off the slag tapping is implemented in converter, will calculate good vanadium-bearing hot metal after the tapping and pour in the ladle, converts in the iron process ladle and implements online blowing argon gas or nitrogen, accomplishes second through this step and goes on foot and increase vanadium; The vanadium-bearing hot metal staple weight percent of choosing is: C>=3.80%, V>=0.250, P≤0.120%, S≤0.080%, and all the other are Fe and other element, temperature is not less than 1250 ℃;
E. after accomplishing the vanadium alloying operation, molten steel further carries out other compositions of refining treatment assurance such as Argon, the refining of LF stove or CAS-OB, the qualified back of temperature is gone up continuous casting and poured into a mould, and is rolled then.
Embodiment 1:
Smelt heat 1: this heat is smelted ∮ 6mmHRB400 reinforcing bar, is limited to 0.015% under its finished product V internal control.This heat uses semi-steel making, and converter terminal C:0.15%, P:0.025%, S:0.040% meet the tapping requirement, tap then.The order of pressing vanadium slag-reductive agent-silicomanganese-particle lime-slag supplying agent in the tapping process adds material, and reductor uses sial barium, and add-on is a 0.2kg/ ton steel; Wherein v slag grade is 12.5%, and add-on is a 2kg/ ton steel, and it is 0.012% that theory increases the vanadium amount; Reductive agent is an aluminium powder, and add-on is a 0.5kg/ ton steel, and the particle lime adding amount is a 3kg/ ton steel; Slag supplying agent is that calcium aluminate is a slag supplying agent, and its composition scope weight percent is: CaO:40%, Al
2O
3: SiO 20%,
2≤10%, all the other are impurity, and its add-on is 1/2 of a particle lime adding amount, is 150kg, and tapping process blowing argon gas, air supply intensity are the 2L/mint steel, carry out the pushing off the slag tapping.Carry out after the tapping second the step increase vanadium, used vanadium-bearing hot metal composition is: C:3.80%, V:0.310%, P≤0.120%, S≤0.080%, all the other are Fe and other element; 1250 ℃ of temperature increase vanadium amount 0.003% by it and calculate the molten iron amount of being blended into, and add-on is a 10kg/ ton steel; Convert iron process nitrogen blowing operation, air supply intensity is the 3L/mint steel, accomplishes and converts the iron operation after after the Argon, continuous casting; Strand is rolled anti-seismic steel bar; The finished product content of vanadium was 0.020% (comprising the surplus vanadium of terminal point), and V and other composition meet this specification composition requirement, and strand reinforcing bar each item performance after rolling satisfies shockproof requirements.
Embodiment 2:
Smelt heat 2: this heat is smelted ∮ 25mmHRB400 reinforcing bar, is limited to 0.030% under its finished product V internal control.This heat uses semi-steel making, and converter terminal C:0.08%, P:0.020%, S:0.035% meet the tapping requirement, tap then.The order of pressing vanadium slag-reductive agent-silicomanganese-particle lime-slag supplying agent in the tapping process adds material, and reductor uses ferrosilicoaluminum, and add-on is a 0.5kg/ ton steel; Wherein v slag grade is 13%, and add-on is a 3.5kg/ ton steel, and it is 0.020% that theory increases the vanadium amount; Reductive agent is a silicon calcium powder, and add-on is a 1kg/ ton steel, and the particle lime adding amount is a 5kg/ ton steel; Slag supplying agent is that calcium aluminate is a slag supplying agent, and its composition scope weight percent is: CaO:45%, Al
2O
3: SiO 30%,
2≤10%, all the other are impurity, and its add-on is 1/3 of a particle lime adding amount, is 170kg, the operation of tapping process nitrogen blowing, and air supply intensity is the 3L/mint steel, carries out the pushing off the slag tapping.Carry out after the tapping second the step increase vanadium, used vanadium-bearing hot metal composition is: C:3.90%, V:0.400%, P≤0.120%, S≤0.080%, all the other are Fe and other element; 1270 ℃ of temperature increase vanadium amount 0.010% by it and calculate the molten iron amount of being blended into, and add-on is a 25kg/ ton steel; Convert the operation of iron process nitrogen blowing, air supply intensity is the 3L/mint steel, after the iron operation is converted in completion; Behind the refining of LF stove, continuous casting, strand is rolled anti-seismic steel bar, and the finished product content of vanadium was 0.04% (comprising the surplus vanadium of terminal point); V and other composition meet this specification composition requirement, and strand reinforcing bar each item performance after rolling satisfies shockproof requirements.
Embodiment 3:
Smelt heat 3: this heat is smelted ∮ 32mmHRB400 reinforcing bar, is limited to 0.035% under its finished product V internal control.This heat uses semi-steel making, and converter terminal C:0.03%, P:0.010%, S:0.033% meet the tapping requirement, tap then.The order of pressing vanadium slag-reductive agent-silicomanganese-particle lime-slag supplying agent in the tapping process adds material, and reductor uses Si-Al-Ca-Ba, and add-on is a 1.5kg/ ton steel; Wherein v slag grade is 13%, and add-on is a 3.5kg/ ton steel, and it is 0.020% that theory increases the vanadium amount; Reductive agent is a silicon calcium powder, and add-on is a 1kg/ ton steel, and the particle lime adding amount is a 6kg/ ton steel; Slag supplying agent is that calcium aluminate is a slag supplying agent, and its composition scope weight percent is: CaO:45%, Al
2O
3: SiO 30%,
2≤10%, all the other are impurity, and its add-on is 1/4 of a particle lime adding amount, is 150kg, the operation of tapping process blowing argon gas, and air supply intensity is the 4L/mint steel, carries out the pushing off the slag tapping.Carry out after the tapping second the step increase vanadium, used vanadium-bearing hot metal composition is: C:3.90%, V:0.370%, P≤0.120%, S≤0.080%, all the other are Fe and other element; 1260 ℃ of temperature increase vanadium amount 0.015% by it and calculate the molten iron amount of being blended into, and add-on is a 40kg/ ton steel; Convert the operation of iron process nitrogen blowing, air supply intensity is the 3L/mint steel, after the iron operation is converted in completion; Behind the refining of LF stove, continuous casting, strand is rolled anti-seismic steel bar, and the finished product content of vanadium was 0.043% (comprising the surplus vanadium of terminal point); V and other composition meet the composition requirement, and strand reinforcing bar each item performance after rolling satisfies shockproof requirements.
Embodiment 4:
Smelt heat 4: this heat is smelted ∮ 40mmHRB400 reinforcing bar, and its finished product V internal control scope is 0.04-0.06%.This heat uses semi-steel making, and converter terminal C:0.10%, P:0.020%, S:0.033% meet the tapping requirement, tap then.The order of pressing vanadium slag-reductive agent-silicomanganese-particle lime-slag supplying agent in the tapping process adds material, and reductor uses Si-Al-Ca-Ba, and add-on is a 1.5kg/ ton steel; Wherein v slag grade is 13%, and add-on is a 8kg/ ton steel, and it is 0.050% that theory increases the vanadium amount; Reductive agent is a ferrosilicon powder, and add-on is a 2kg/ ton steel, and the particle lime adding amount is a 8kg/ ton steel; Slag supplying agent is that calcium aluminate is a slag supplying agent, and its composition scope weight percent is: CaO:40%, Al
2O
3: SiO 50%,
2≤10%, all the other are impurity, and its add-on is 1/4 of a particle lime adding amount, is 200kg, the operation of tapping process blowing argon gas, and air supply intensity is the 6L/mint steel, carries out the pushing off the slag tapping.Carry out after the tapping second the step increase vanadium, used vanadium-bearing hot metal composition is: C:3.90%, V:0.250%, P≤0.120%, S≤0.080%, all the other are Fe and other element; 1260 ℃ of temperature increase vanadium amount 0.005% by it and calculate the molten iron amount of being blended into, and add-on is a 20kg/ ton steel; Convert the operation of iron process nitrogen blowing, air supply intensity is the 6L/mint steel, after the iron operation is converted in completion; Behind the refining of LF stove, continuous casting, strand is rolled anti-seismic steel bar, and the finished product content of vanadium was 0.060% (comprising the surplus vanadium of terminal point); V and other composition meet the composition requirement, and strand reinforcing bar each item performance after rolling satisfies shockproof requirements.
Claims (7)
1. the smelting technology of an III level hot-rolled screw thread reinforcing bar is characterized in that comprising following process step:
A. vanadium-bearing hot metal is at first handled through vanadium extraction, carries out magnetic separation, fragmentation inside after the vanadium slag cooling that vanadium extraction obtains after handling, and broken back granularity is the 5-40mm size, and with using the alloy material feed bin to converter steelmaking on the vanadium slag;
B. the half steel that obtains after the vanadium-bearing hot metal vanadium extraction is blended into steel-making converter and blows, and when terminal point composition weight percent meets C≤0.15%, S≤0.040%, P≤0.025%, carries out tapping steel;
C. carry out in the tapping process having calculated and carry out the deoxidation alloying operation behind the alloy addition according to the specification of smelting reinforcing bar; The alloy material addition sequence is: vanadium slag-reductive agent-silicomanganese-particle lime-slag supplying agent, and above material all places in the alloy truck, and tapping process evenly adds; Reductor normally adds; Carry out on-line argon-blow gas or nitrogen in the tapping process, guarantee that slag charge fully melts, accomplish the first step through this step and increase vanadium;
D. the pushing off the slag tapping is implemented in converter, will calculate good vanadium-bearing hot metal after the tapping and pour in the ladle, converts in the iron process ladle and implements online blowing argon gas or nitrogen, accomplishes second through this step and goes on foot and increase vanadium;
E. after accomplishing the vanadium alloying operation, molten steel further carries out Argon, the refining of LF stove or CAS-OB refining treatment, and assurance composition, the qualified back of temperature are gone up continuous casting and poured into a mould, and are rolled then;
The chemical component weight per-cent of the III level hot-rolled screw thread reinforcing bar of f. producing as stated above is following: C:0.20-0.25%; Si:0.20-0.80%; Mn:1.20-1.60%; P :≤0.045%; S :≤0.045%; V:0.010-0.060%, production specification are that nominal diameter is a ∮ 6mm-∮ 40mm specification.
2. the smelting technology of III level hot-rolled screw thread reinforcing bar according to claim 1 is characterized in that among the said step a, is used for the vanadium slag V of alloying
2O
5Weight percent should be not less than 12.5%, i.e. oxide compound V in the vanadium slag
2O
5The ratio of weight and vanadium slag weight is not less than 12.5%, calculates its add-on according to the steel grade specification.
3. according to the smelting technology method of claim 1 or 2 said III level hot-rolled screw thread reinforcing bars, it is characterized in that among the said step c that reductive agent is a kind of of ferrosilicon powder, silicon calcium powder or aluminium powder, add-on is a 0.5-2kg/ ton steel; Reductor is a kind of in sial barium, aluminium manganese calcium magnesium, sial barium strontium, ferrosilicoaluminum, ferro-aluminum, the Si-Al-Ca-Ba, and add-on is a 0.2-1.5kg/ ton steel.
4. the smelting technology of III level hot-rolled screw thread reinforcing bar according to claim 1 and 2 is characterized in that among the said step c, and the CaO content weight percent of particle lime is not less than 80%, SiO
2The content weight percent is not more than 3%, and P, S content weight percent are not more than 0.080%, and activity degree is not less than 250ml, and globule size is 5-30mm, and the particle lime adding amount is a 3-8kg/ ton steel.
5. the smelting technology of III level hot-rolled screw thread reinforcing bar according to claim 1 and 2; It is characterized in that among the said step c; Slag supplying agent is not for containing the slag supplying agent of CaF, and selecting high basicity calcium aluminate for use is slag supplying agent, and its composition scope weight percent is: CaO:40-60%, Al
2O
3: 20-50%, SiO
2≤10%, all the other are impurity, and its add-on is the 1/4-1/2 of particle lime adding amount.
6. the smelting technology of III level hot-rolled screw thread reinforcing bar according to claim 1 and 2 is characterized in that among said step c and the d that argon gas and nitrogen air supply intensity are the 2-6L/mint steel.
7. the smelting technology of III level hot-rolled screw thread reinforcing bar according to claim 1 and 2; It is characterized in that among the said step e; Vanadium-bearing hot metal composition weight percent is: C>=3.80%, V>=0.250%, P≤0.120%, S≤0.080%; All the other are Fe and other element, and temperature is not less than 1250 ℃, and the tapping back increases the vanadium amount according to vanadium slag and will calculate in the good iron water amount adding ladle.
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| CN201110254856A CN102304604A (en) | 2011-08-31 | 2011-08-31 | Smelting technology of III grade hot-rolled ribbed bars |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102864271A (en) * | 2012-09-21 | 2013-01-09 | 承德建龙特殊钢有限公司 | Digestion process of vanadium extraction waste slag in semi-steel steelmaking converter |
| CN102876832A (en) * | 2012-09-21 | 2013-01-16 | 承德建龙特殊钢有限公司 | Process for performing converter alloying vanadium increase by sheeted V2O5 |
| CN102978328A (en) * | 2012-10-31 | 2013-03-20 | 高金菊 | Preparation method for composite slagging agent used for converter |
| CN102978329A (en) * | 2012-10-31 | 2013-03-20 | 高金菊 | Composite slagging agent for converter |
| CN102994871A (en) * | 2012-11-22 | 2013-03-27 | 河北钢铁股份有限公司承德分公司 | Method for smelting medium/high-carbon hard-wired steel by vanadium-titanium containing molten iron |
| CN103031402A (en) * | 2012-06-06 | 2013-04-10 | 宝钢集团新疆八一钢铁有限公司 | Production method for high-strength aseismic steel bar HRB400E |
| CN103667871A (en) * | 2013-11-12 | 2014-03-26 | 山东西王特钢有限公司 | Processing technology for mantle fiber-free deformed steel bar |
| CN103820597A (en) * | 2014-02-20 | 2014-05-28 | 河北钢铁股份有限公司承德分公司 | Efficient utilization method of residual vanadium in semisteel |
| CN104694707A (en) * | 2015-02-16 | 2015-06-10 | 河北钢铁股份有限公司承德分公司 | Method for alloying vanadium and nitrogen by using vanadium-containing slag and nitrogen |
| CN105219912A (en) * | 2015-10-30 | 2016-01-06 | 河北钢铁股份有限公司承德分公司 | A kind of method regulating low alloy steel refining slag system basicity |
| CN105525204A (en) * | 2015-12-27 | 2016-04-27 | 刘家容 | Production method of steel bar with good anti-shock property |
| CN106399848A (en) * | 2016-09-19 | 2017-02-15 | 石横特钢集团有限公司 | High-toughness MG500 anchor rod reinforcing steel bar and production method thereof |
| CN108193011A (en) * | 2017-12-29 | 2018-06-22 | 攀钢集团攀枝花钢钒有限公司 | The method that the converter smelting of half steel containing vanadium carries out vanadium alloying using vanadium slag |
| CN109868336A (en) * | 2019-03-12 | 2019-06-11 | 山东钢铁股份有限公司 | A kind of method of manganese content in control molten steel |
| CN110205434A (en) * | 2019-07-12 | 2019-09-06 | 攀钢集团攀枝花钢铁研究院有限公司 | The method that low cost smelts concrete-steel |
| CN111979373A (en) * | 2020-07-20 | 2020-11-24 | 河钢股份有限公司承德分公司 | Method for increasing vanadium by microalloying vanadium slag and vanadium-containing iron block |
| CN114000051A (en) * | 2021-09-29 | 2022-02-01 | 武钢集团昆明钢铁股份有限公司 | Ultra-fine grain HRB400E wire rod anti-seismic steel bar and preparation method thereof |
| CN115141970A (en) * | 2022-06-25 | 2022-10-04 | 阳春新钢铁有限责任公司 | HRB500E microalloying control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1215090A (en) * | 1998-11-02 | 1999-04-28 | 承德钢铁集团有限公司 | Vanadium pellet for steel smelting and alloyage process thereof |
| CN101798618A (en) * | 2010-03-26 | 2010-08-11 | 河北钢铁股份有限公司承德分公司 | Method for performing vanadium increase and refining in vanadium alloying by utilizing vanadium slag |
| CN102071349A (en) * | 2011-01-01 | 2011-05-25 | 河北钢铁股份有限公司承德分公司 | Method for producing microalloy steel by using rare elements in molten iron |
-
2011
- 2011-08-31 CN CN201110254856A patent/CN102304604A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1215090A (en) * | 1998-11-02 | 1999-04-28 | 承德钢铁集团有限公司 | Vanadium pellet for steel smelting and alloyage process thereof |
| CN101798618A (en) * | 2010-03-26 | 2010-08-11 | 河北钢铁股份有限公司承德分公司 | Method for performing vanadium increase and refining in vanadium alloying by utilizing vanadium slag |
| CN102071349A (en) * | 2011-01-01 | 2011-05-25 | 河北钢铁股份有限公司承德分公司 | Method for producing microalloy steel by using rare elements in molten iron |
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103031402A (en) * | 2012-06-06 | 2013-04-10 | 宝钢集团新疆八一钢铁有限公司 | Production method for high-strength aseismic steel bar HRB400E |
| CN103031402B (en) * | 2012-06-06 | 2014-11-05 | 宝钢集团新疆八一钢铁有限公司 | Production method for high-strength aseismic steel bar HRB400E |
| CN102876832A (en) * | 2012-09-21 | 2013-01-16 | 承德建龙特殊钢有限公司 | Process for performing converter alloying vanadium increase by sheeted V2O5 |
| CN102864271A (en) * | 2012-09-21 | 2013-01-09 | 承德建龙特殊钢有限公司 | Digestion process of vanadium extraction waste slag in semi-steel steelmaking converter |
| CN102978329A (en) * | 2012-10-31 | 2013-03-20 | 高金菊 | Composite slagging agent for converter |
| CN102978328B (en) * | 2012-10-31 | 2014-11-12 | 高金菊 | Preparation method for composite slagging agent used for converter |
| CN102978329B (en) * | 2012-10-31 | 2014-12-24 | 高金菊 | Composite slagging agent for converter |
| CN102978328A (en) * | 2012-10-31 | 2013-03-20 | 高金菊 | Preparation method for composite slagging agent used for converter |
| CN102994871A (en) * | 2012-11-22 | 2013-03-27 | 河北钢铁股份有限公司承德分公司 | Method for smelting medium/high-carbon hard-wired steel by vanadium-titanium containing molten iron |
| CN102994871B (en) * | 2012-11-22 | 2014-07-02 | 河北钢铁股份有限公司承德分公司 | Method for smelting medium/high-carbon hard-wired steel by vanadium-titanium containing molten iron |
| CN103667871A (en) * | 2013-11-12 | 2014-03-26 | 山东西王特钢有限公司 | Processing technology for mantle fiber-free deformed steel bar |
| CN103820597A (en) * | 2014-02-20 | 2014-05-28 | 河北钢铁股份有限公司承德分公司 | Efficient utilization method of residual vanadium in semisteel |
| CN103820597B (en) * | 2014-02-20 | 2015-07-01 | 河北钢铁股份有限公司承德分公司 | Efficient utilization method of residual vanadium in semisteel |
| CN104694707A (en) * | 2015-02-16 | 2015-06-10 | 河北钢铁股份有限公司承德分公司 | Method for alloying vanadium and nitrogen by using vanadium-containing slag and nitrogen |
| CN105219912A (en) * | 2015-10-30 | 2016-01-06 | 河北钢铁股份有限公司承德分公司 | A kind of method regulating low alloy steel refining slag system basicity |
| CN105525204A (en) * | 2015-12-27 | 2016-04-27 | 刘家容 | Production method of steel bar with good anti-shock property |
| CN106399848A (en) * | 2016-09-19 | 2017-02-15 | 石横特钢集团有限公司 | High-toughness MG500 anchor rod reinforcing steel bar and production method thereof |
| CN108193011A (en) * | 2017-12-29 | 2018-06-22 | 攀钢集团攀枝花钢钒有限公司 | The method that the converter smelting of half steel containing vanadium carries out vanadium alloying using vanadium slag |
| CN109868336A (en) * | 2019-03-12 | 2019-06-11 | 山东钢铁股份有限公司 | A kind of method of manganese content in control molten steel |
| CN110205434A (en) * | 2019-07-12 | 2019-09-06 | 攀钢集团攀枝花钢铁研究院有限公司 | The method that low cost smelts concrete-steel |
| CN111979373A (en) * | 2020-07-20 | 2020-11-24 | 河钢股份有限公司承德分公司 | Method for increasing vanadium by microalloying vanadium slag and vanadium-containing iron block |
| CN114000051A (en) * | 2021-09-29 | 2022-02-01 | 武钢集团昆明钢铁股份有限公司 | Ultra-fine grain HRB400E wire rod anti-seismic steel bar and preparation method thereof |
| CN114000051B (en) * | 2021-09-29 | 2022-05-10 | 武钢集团昆明钢铁股份有限公司 | Ultra-fine grain HRB400E wire rod anti-seismic steel bar and preparation method thereof |
| CN115141970A (en) * | 2022-06-25 | 2022-10-04 | 阳春新钢铁有限责任公司 | HRB500E microalloying control method |
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