CN112063911A - Preparation method for producing HRB400E high-strength anti-seismic bar - Google Patents
Preparation method for producing HRB400E high-strength anti-seismic bar Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
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- 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
Abstract
The invention discloses a preparation method for producing HRB400E high-strength anti-seismic bars, wherein the steel bars comprise the following components in percentage by weight: c: 0.20 to 0.25%, Si: 0.25 to 0.55%, Mn: 1.20-1.45%, V: 0.020-0.040%, and the balance of Fe and impurities, wherein S in the impurities is less than or equal to 0.045%, and P is less than or equal to 0.045%; adding a carburant and a micro-nitrogen alloy into a steel flow impact area at the bottom of a steel ladle before tapping, strongly stirring bottom-blown argon for 3-4 minutes when the pressure is 0.4-0.6 MPa in the tapping process, adding the alloy in the sequence of ferrosilicon, silicomanganese and vanadium-nitrogen, adding the alloy along with the steel flow when tapping 1/4, and completely adding molten steel when tapping 3/4; the cost of the blank for the HRB400E high-strength anti-seismic steel bar prepared by the method is greatly reduced, and N, V added into the steel can play a role in solid solution strengthening and precipitation strengthening and also can play a role in grain refining, so that the strength of the steel can be improved, and the toughness of the steel can be improved.
Description
Technical Field
The invention belongs to the field of steel smelting, and particularly relates to a preparation method for producing a high-strength anti-seismic HRB400E bar.
Background
The micro-alloying elements Nb and V exist in the steel in two forms: precipitates in the form of solid solution elements and compounds dissolved in iron; the compound forms are divided into two types:
a) when a casting blank is heated, a compound (generally a Nb compound) which is not redissolved in austenite can inhibit recrystallization and prevent grains from growing, but if the size is too large, the steel bar has no benefit or even has negative effect on the improvement of the performance of the steel bar;
b) fine and dispersedly distributed carbonitrides precipitated in the rolling and cooling processes play a role in precipitation strengthening and can improve the toughness of the steel bar. The solubility of nitrogen in ferrite is not high, but nitrogen can remarkably improve the yield strength of steel and far exceeds the solid solution strengthening effect of elements such as P, Mn; besides solid solution strengthening, nitrogen is also a good precipitation strengthening element, and can generate nitrides, particularly vanadium, with microalloying elements such as vanadium, niobium, titanium and the like. Compared with carbide, nitrogen has stronger affinity with vanadium, the generated nitride is more stable, and the precipitation strengthening effect of microalloying elements such as vanadium is enhanced.
Besides the strengthening effect of the enhanced precipitation, nitrogen also has the obvious effect of refining grains in steel. During the solidification process of molten steel, on one hand, supersaturated nitrogen and aluminum in the steel generate AlN, and fine AlN is precipitated at a crystal boundary to play a role of pinning and prevent grains from growing. On the other hand, the nitrogen increase promotes the precipitation of carbonitride at the austenite-ferrite phase interface, effectively prevents the growth of ferrite grains and plays a role in refining the size of the ferrite grains. For high-nitrogen vanadium steel, VN or V (C, N) is precipitated to promote the formation of intragranular ferrite (IGF), which becomes another effective way for grain refinement of vanadium-nitrogen steel.
At present, the production of high-strength anti-seismic reinforcing steel bars mainly adopts a microalloying strengthening technology, a waste heat treatment technology and a fine grain strengthening technology, and is limited by the capabilities of a rolling mill and cooling equipment, so that normal welding performance and a metallographic structure cannot be obtained, and in addition, the new national standard GB/T1499.2-2018 is added, and the microalloying technology is mainly adopted in various large steel mills at present. Because the market amount of the high-strength anti-seismic reinforcing steel bar is large, the low cost is particularly important for the high-strength anti-seismic reinforcing steel bar.
Disclosure of Invention
The invention aims to provide a preparation method for producing a high-strength anti-seismic bar HRB400E, which is used for solving the problems of high production cost and high energy consumption caused by high price of a vanadium element additive used in the production process of the existing steel rolling deformed steel bar and high rolling temperature of niobium element.
The invention adopts the following technical scheme: a preparation method for producing HRB400E high-strength anti-seismic bar comprises the following components by weight percent: c: 0.20 to 0.25%, Si: 0.25 to 0.55%, Mn: 1.20-1.45%, V: 0.020-0.040%, and the balance of Fe and impurities, wherein S in the impurities is less than or equal to 0.045%, and P is less than or equal to 0.045%;
adding a carburant and a micro-nitrogen alloy into a steel flow impact area at the bottom of a steel ladle before tapping, strongly stirring bottom-blown argon for 3-4 minutes when the pressure is 0.4-0.6 MPa in the tapping process, adding the alloy in the sequence of ferrosilicon, silicomanganese and vanadium-nitrogen, adding the alloy along with the steel flow when tapping 1/4, and completely adding molten steel when tapping 3/4.
Further, the steel bar comprises the following components in percentage by weight: c: 0.20 to 0.25%, Si: 0.25 to 0.55%, Mn: 1.20-1.45%, V: 0.030%, the balance consisting of Fe and impurities, of which: s is less than or equal to 0.045 percent, and P is less than or equal to 0.045 percent.
Further, the micro nitrogen alloy comprises the following components in percentage by weight: n: 23.0-26.0%, C: 1% -3%, Si: 47-49%, Mn: 2% -3%, the balance of Fe and impurities, wherein: s is less than or equal to 0.035%, P is less than or equal to 0.040%.
Further, the vanadium-nitrogen composite material comprises the following components in percentage by weight: v: 76% -78%, N: 12% -14%, C: less than or equal to 6.0 percent, less than or equal to 1.5 percent of Si, the balance of Fe and impurities, wherein P in the impurities is less than or equal to 0.01 percent, and S is less than or equal to 0.01 percent.
Further, the ferrosilicon comprises the following components in percentage by weight: si: 71-80 percent of Al is less than or equal to 1.5 percent, Ca is less than or equal to 1.0 percent, Mn is less than or equal to 0.5 percent, Cr is less than or equal to 0.5 percent, and the balance is Fe and impurities, wherein P in the impurities is less than or equal to 0.05 percent, and S is less than or equal to 0.03 percent.
Further, the silicon-manganese alloy comprises the following components in percentage by weight: mn: 63-72%, Si: 16-20%, C is less than or equal to 2.5%, and the balance is Fe and impurities, wherein P in the impurities is less than or equal to 0.25%, and S is less than or equal to 0.04%.
Furthermore, the yield strength of the bar is 425-475 MPa, the tensile strength is 600-640 MPa, the yield ratio is 1.30-1.45, and the yield ratio is 1.05-1.20.
A preparation method for producing HRB400E high-strength anti-seismic bar comprises the following components by weight percent: c: 0.23%, Si: 0.40%, Mn: 1.30%, V: 0.030%, S: 0.035%, P: 0.040 percent, 204kg of carburant and 65kg of micro-nitrogen alloy are added into a steel stream impact zone at the bottom of the ladle before tapping, argon is blown at the bottom in the tapping process, the mixture is stirred strongly for 3 minutes under the pressure of 0.55MPa, the alloy addition sequence is 261kg of ferrosilicon, 2618kg of silicomanganese and 59.5kg of vanadium-nitrogen, the alloy is added along with the steel stream when tapping 1/4, and the molten steel is completely added when the molten steel is discharged to 3/4.
A preparation method for producing HRB400E high-strength anti-seismic bar comprises the following components by weight percent: c: 0.23%, Si: 0.40%, Mn: 1.30%, V: 0.030%, S: 0.035%, P: 0.040%, adding 206kg of carburant and 65kg of micro-nitrogen alloy into a steel stream impact zone at the bottom of a ladle before tapping, strongly stirring for 4 minutes under the condition that the pressure of argon blown from the bottom is 0.60MPa in the tapping process, adding the alloy into 261kg of ferrosilicon, 2618kg of silicomanganese and 59.5kg of vanadium-nitrogen in sequence, adding the alloy along with steel stream when tapping 1/4, and completely adding the molten steel when the molten steel is discharged to 3/4.
The invention has the beneficial effects that: the cost of the blank for the HRB400E high-strength anti-seismic steel bar prepared by the method is greatly reduced, and N, V added into the steel can play roles in solid solution strengthening and precipitation strengthening and grain refining, so that the strength of the steel can be improved, and the toughness of the steel can be improved; the method uses the micro-nitrogen alloy with price and cost performance advantages to replace part of silicomanganese and silicon-iron alloy to produce the blank for the HRB400E high-strength anti-seismic reinforcing steel bar, and reduces the addition of the silicomanganese and the silicon-iron alloy and the alloy cost under the condition of ensuring that the steel quality meets the new national standard and is stable, thereby further reducing the production cost.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention discloses a preparation method for producing HRB400E high-strength anti-seismic bars, wherein the steel bars comprise the following components in percentage by weight: c: 0.20 to 0.25%, Si: 0.25 to 0.55%, Mn: 1.20-1.45%, V: 0.020-0.040%, and the balance of Fe and impurities, wherein S in the impurities is less than or equal to 0.045%, and P is less than or equal to 0.045%; during preparation: adding a carburant and a micro-nitrogen alloy into a steel flow impact area at the bottom of a steel ladle before tapping, strongly stirring bottom-blown argon for 3-4 minutes when the pressure is 0.4-0.6 MPa in the tapping process, adding the alloy in the sequence of ferrosilicon, silicomanganese and vanadium-nitrogen, adding the alloy along with the steel flow when tapping 1/4, and completely adding molten steel when tapping 3/4.
Preferably, the steel bar consists of the following components in percentage by weight: c: 0.20 to 0.25%, Si: 0.25 to 0.55%, Mn: 1.20-1.45%, V: 0.030 percent, and the balance of Fe and impurities, wherein S is less than or equal to 0.045 percent, and P is less than or equal to 0.045 percent.
The micro nitrogen alloy comprises the following components in percentage by weight: n: 23.0-26.0%, C: 1% -3%, Si: 47-49%, Mn: 2 to 3 percent, and the balance of Fe and impurities, wherein S is less than or equal to 0.035 percent and P is less than or equal to 0.040 percent. Preferably: n: 25.32%, C: 1.25%, Si: 48.73%, Mn: 2.54 percent, and the balance of Fe and impurities, wherein S is less than or equal to 0.035 percent and P is less than or equal to 0.040 percent.
The vanadium-nitrogen alloy comprises the following components in percentage by weight: v: 76% -78%, N: 12% -14%, C: less than or equal to 6.0 percent, less than or equal to 1.5 percent of Si, the balance of Fe and impurities, wherein P in the impurities is less than or equal to 0.01 percent, and S is less than or equal to 0.01 percent. Preferably: v: not less than 77.5%, N: not less than 12%, C: less than or equal to 6.0 percent, less than or equal to 1.5 percent of Si, the balance of Fe and impurities, wherein P in the impurities is less than or equal to 0.01 percent, and S is less than or equal to 0.01 percent.
The ferrosilicon alloy comprises the following components in percentage by weight: si: 71-80 percent of Al is less than or equal to 1.5 percent, Ca is less than or equal to 1.0 percent, Mn is less than or equal to 0.5 percent, Cr is less than or equal to 0.5 percent, and the balance is Fe and impurities, wherein P in the impurities is less than or equal to 0.05 percent, and S is less than or equal to 0.03 percent.
The silicon-manganese alloy comprises the following components in percentage by weight: mn: 63-72%, Si: 16-20%, C is less than or equal to 2.5%, and the balance is Fe and impurities, wherein P in the impurities is less than or equal to 0.25%, and S is less than or equal to 0.04%.
The yield strength of the bar is 425-475 MPa, the tensile strength is 600-640 MPa, the yield ratio is 1.30-1.45, and the yield ratio is 1.05-1.20.
The preparation method comprises the following steps:
step 1: a converter (if an electric furnace is used, the operation method can be different) is shaken to a molten iron adding position, and a crown block lifts a scrap steel bucket with prepared scrap steel to the converter for adding; hoisting the ladle to the front of the furnace, and adding molten iron into the furnace; the converter was shaken up to the blowing (oxygen blowing) position.
Step 2: the oxygen lance is reduced, the constant-pressure variable lance (the pressure is unchanged, the height position of the oxygen lance is changed) is operated, meanwhile, a slagging agent (lime, high-magnesium ash, sinter and the like) is added, and slag materials are added in two batches; the early stage gun position is lower (the horizontal position is unchanged, the height is adjusted), the early stage slag is ensured, the process slag is completely melted, the later stage gun position is improved, and the slag is prevented from being dried back.
And step 3: lifting the oxygen lance after blowing for 11-15 minutes, shaking the furnace to a sampling position, measuring the temperature, sampling, shaking the furnace, and sending the sample to a laboratory in front of the furnace for testing and detecting C, S, P percent (requiring that C is more than or equal to 0.06 percent, P is less than or equal to 0.035 percent, S is less than or equal to 0.040 percent and T is less than or equal to 1720 ℃); and when the temperature and the components meet the requirements, carrying out tapping operation, and if the temperature and the components do not meet the requirements, adding slag charge again to carry out oxygen blowing operation until the requirements are met.
And 4, step 4: according to the component requirements: the HRB400E high-strength anti-seismic steel bar comprises the following components in percentage by weight: c: 0.20 to 0.25%, Si: 0.25 to 0.55%, Mn: 1.20-1.45%, V: 0.020-0.040%, and the balance of Fe and impurities, wherein S in the impurities is less than or equal to 0.045%, P in the impurities is less than or equal to 0.045%, and the addition amount of the alloy is calculated and weighed in place;
wherein the N element is added through a micro-nitrogen alloy, and the micro-nitrogen alloy comprises the following components in percentage by weight: n: 25.32%, C: 1.25%, Si: 48.73%, Mn: 2.54 percent, and the balance of Fe and impurities, wherein S is less than or equal to 0.035 percent and P is less than or equal to 0.040 percent.
The V element is added through vanadium-nitrogen alloy and consists of the following components in percentage by weight: v: not less than 77.5%, N: not less than 12%, C: less than or equal to 6.0 percent, less than or equal to 1.5 percent of Si, the balance of Fe and impurities, wherein P in the impurities is less than or equal to 0.01 percent, and S is less than or equal to 0.01 percent.
Wherein the element C is added through a carburant and consists of the following components in percentage by weight: c: 88-90% and the balance of impurities.
Wherein the Si element is added through the ferrosilicon alloy and comprises the following components in percentage by weight: si: 71-80 percent of Al is less than or equal to 1.5 percent, Ca is less than or equal to 1.0 percent, Mn is less than or equal to 0.5 percent, Cr is less than or equal to 0.5 percent, and the balance is Fe and impurities, wherein P in the impurities is less than or equal to 0.05 percent, and S is less than or equal to 0.03 percent.
The Mn element is added through a silicon-manganese alloy, and the silicon-manganese alloy comprises the following components in percentage by weight: mn: 63-72%, Si: 16-20%, C is less than or equal to 2.5%, and the balance is Fe and impurities, wherein P in the impurities is less than or equal to 0.25%, and S is less than or equal to 0.04%.
And 5: after the component temperature meets the requirements, the furnace is shaken to the furnace and then steel is tapped, and a ladle car which is located on a ladle is driven to the position below the furnace; adding a carburant and a micro-nitrogen alloy into a steel flow impact area at the bottom of a steel ladle before tapping, blowing argon from the bottom during tapping to stir strongly for 3-4 minutes (pressure: 0.4-0.6 MPa), adding the alloy in the sequence of ferrosilicon, silicomanganese and vanadium-nitrogen, adding the alloy along with the steel flow when tapping 1/4, and completely adding the molten steel when tapping 3/4.
Step 6: after tapping, the buggy ladle is driven out and the molten steel is allowed to calm for more than or equal to 5 minutes (pressure: 0.4-0.6 MPa); the above smelting is completed.
And 7: the ladle is hoisted to a ladle turret (device), and is provided with a long nozzle to be cast into a continuous casting billet.
And 8: and (3) conveying the continuous casting blank to a bar rolling line, and feeding the continuous casting blank into a heating furnace for heating, wherein the heating temperature of the soaking section is 1110-1170 ℃, and the heating time is 50-80 min.
And step 9: and (3) carrying out rough rolling, medium rolling and finish rolling on the heated steel billet, and naturally cooling the steel billet on a cooling bed to room temperature to obtain the niobium-vanadium microalloyed HRB400E high-strength anti-seismic steel bar.
The reaction formula is as follows:
(1) oxidation of Fe:
O2+2(Fe)＝2FeO (O)+(Fe)＝FeO
(2) oxidation and reduction of Si
2(O)+(Si)＝SiO2
(Si)+2(FeO)＝(SiO2)+2(Fe)
(SiO2)+2(FeO)＝(2FeO·SiO2)
(2FeO·SiO2)+2(CaO)＝(2CaO·SiO2)+2(FeO)
(3) Oxidation and reduction of Mn:
O2+2(Mn)＝2MnO (Mn)+(O)＝(MnO)
(Mn)+(FeO)＝(MnO)+(Fe)
(4) oxidation and reduction of C
2(C)+O2＝2CO
(FeO)+O2＝(Fe2O3) (Fe2O3)+(Fe)＝3(FeO)
(FeO)＝(O)+(Fe) (C)+(O)＝CO
(5) P removal reaction
2(P)+5(FeO)＝(P2O5)+5(Fe)
3(FeO)+(P2O5)＝(3FeO·P2O5)
(3FeO·P2O5)+4(CaO)＝(4CaO·P2O5)+3(FeO)
2(P)+5(FeO)+4(CaO)＝(4CaO·P2O5)+5(Fe)
(6) S removal reaction
(FeS)＝(FeS) (FeS)+(CaO)＝(Cas)+(FeO)
(FeS)+(CaO)＝(Cas)+(FeO)
The cost of the blank for the HRB400E high-strength anti-seismic steel bar prepared by the method is greatly reduced, and N, V added into the steel can play roles in solid solution strengthening and precipitation strengthening and grain refining, so that the strength of the steel can be improved, and the toughness of the steel can be improved; the method has the advantages that the micro nitrogen alloy with price and cost performance advantages is used for replacing partial silicon-manganese and silicon-iron alloy, blank production is carried out on HRB400E high-strength anti-seismic reinforcing steel bars, under the condition that the steel quality meets the requirements of new national standards and is stable, the adding amount of the silicon-manganese and silicon-iron alloy is reduced, the alloy cost is reduced, the production cost is further reduced, V, N two elements are added to the steel blank components, the effects of solid solution strengthening and precipitation strengthening can be achieved under the combined action of the casting blank crystallization process, the effect of grain refining can be achieved, the strength of the steel can be improved, and the toughness of the steel can be improved.
After the micro-nitrogen alloy is added, the content of N in the steel can reach more than 0.0090%, the content of N in the steel is improved, and V and N in the steel can better generate VN in the process of casting blank crystallization, so that the content of VN in the steel is increased, the solid solution strengthening, precipitation strengthening and grain refining effects of VN are further enhanced, and the strength and toughness of the steel are greatly improved. By improving the content of N in the steel, the content of VN in the steel is increased, and the solid solution strengthening, precipitation strengthening and grain refining effects of VN are further enhanced, so that the strength of the steel is improved, and the toughness of the steel is improved.
The method comprises the steps of adding a micro nitrogen alloy whole bag into a steel ladle bottom steel flow impact area before tapping, blowing argon gas at the bottom in the tapping process for strong stirring, and keeping strong stirring for 3-4 minutes after entering a bottom blowing station, so as to ensure that the added micro nitrogen alloy is fully dissolved into molten steel; VN production is enhanced due to the presence of vanadium in the vanadium microalloying HRB 400E.
The production cost of the blank for the HRB400E high-strength anti-seismic reinforcing steel bar can be reduced, the performance and the quality of steel products are ensured, the product meets the requirements of the new national standard GB/T1499.2-2018, and the production method of the blank for the N-V micro-alloying HRB400E high-strength anti-seismic reinforcing steel bar is developed by combining the production process of the V micro-alloying HRB400E high-strength anti-seismic reinforcing steel bar, so that the cost of the alloy for producing steel per ton is reduced by about 15 yuan compared with the cost of producing steel per ton by vanadium micro-alloying HRB400E, wherein the adding amount of silicon-iron alloy is reduced by 2.4kg per ton of steel, and.
Example 1
The method comprises the following steps of preparing the phi 25mmHRB400E high-strength anti-seismic steel bar: c: 0.20 to 0.25%, Si: 0.25 to 0.55%, Mn: 1.20-1.45%, V: 0.020-0.040%.
Step 1: a 120-ton converter is shaken to a molten iron adding position, and a crown block lifts a scrap steel bucket with prepared scrap steel (30 tons) to the front of the converter for adding; hoisting the ladle to the front of the furnace, and adding 125 tons of molten iron into the furnace; the converter was shaken up to the blowing (oxygen blowing) position.
Step 2: the oxygen lance is reduced, the constant pressure lance (pressure) is changed, and simultaneously, slag-forming agents (lime 29kg/t, high magnesium ash 16.5kg/t, sludge balls 12.5kg/t and the like) are added, and slag materials are added in two batches; the early-stage gun position is low (the horizontal position is unchanged, and the height is adjusted to be 1m away from the liquid level of the molten steel), early-stage slag formation and complete slag formation in the process are ensured, and the later-stage gun position is improved (the horizontal position is unchanged, and the height is adjusted to be 1.4m away from the liquid level of the molten steel) to prevent slag from drying back.
And step 3: after blowing for 12 minutes, lifting the oxygen lance, shaking the furnace to a sampling position, measuring the temperature, sampling, conveying to a test room in front of the furnace for testing, and shaking the furnace right.
And 4, step 4: according to the component requirements: HRB400E high-strength aseismic steel bar, which comprises the following components in percentage by weight: 0.23%, Si: 0.40%, Mn: 1.30%, V: 0.030%, S: 0.035%, P: 0.040%, the following components were weighed: carburant: 204kg of vanadium-nitrogen alloy, 59.5kg of vanadium-nitrogen alloy, 261kg of silicon-iron alloy, 2618kg of silicon-manganese alloy and 65kg of micro-nitrogen alloy, and weighing in place; wherein the micro nitrogen alloy: n: 25.32%, vanadium-nitrogen alloy V: 78%, carburant C: 90%, silicon-iron alloy Si: 75%, silicon-manganese alloy Mn: 65%, Si: 18 percent.
And 5: component temperature detection results: c: 0.10%, P: 0.030%, S: 0.027%, T: 1685 ℃ and meeting the requirements, the furnace is shaken to the furnace and then steel is discharged, a ladle car which is positioned on a ladle is driven to the lower part of the furnace, 204kg of carburant and 65kg of micro-nitrogen alloy are firstly added at the bottom of the ladle, the rest is added in the tapping process, the alloy is added along with steel flow when 1/4 steel is discharged, the alloy addition sequence is ferrosilicon, silicomanganese and vanadium nitrogen, all the alloy is added when the molten steel is discharged to 3/4, the bottom of the ladle is added and opened to blow argon (the pressure is 0.55MPa, and the stirring is carried out for 3 minutes).
Step 6: after tapping, the ladle car was driven out and the molten steel was allowed to stand for 7 minutes (pressure: 0.5 MPa); the above smelting is completed.
And 7: hoisting the ladle to a ladle turret (device), and pouring the ladle into a continuous casting billet with a long nozzle;
and 8: and (3) conveying the continuous casting blank to a bar rolling line, and feeding the continuous casting blank into a heating furnace for heating, wherein the heating temperature of the soaking section is 1160 ℃, and the heating time is 60 min.
And step 9: and (3) carrying out rough rolling, medium rolling and finish rolling on the heated steel billet, and naturally cooling the steel billet on a cooling bed to room temperature to obtain the niobium-vanadium microalloyed HRB400E high-strength anti-seismic steel bar.
Through tests, the parameters of the steel bar prepared in the embodiment 1 are shown in the table 1, and the mechanical properties of the steel are all qualified.
TABLE 1 sample Performance data
The comparison of the cost of the vanadium microalloying (CK) and the production method (HRB400E) of the invention under the same production conditions shows that the invention can reduce the contents of Si and Mn and reduce the addition of Si-Mn and Si-Fe alloy under the same production conditions of the vanadium microalloying high-strength anti-seismic steel bar, as shown in Table 2.
TABLE 2 comparison of phi 25mm specification costs
Example 2
The method comprises the following steps of preparing the phi 12mmHRB400E high-strength anti-seismic steel bar: c: 0.20 to 0.25%, Si: 0.25 to 0.55%, Mn: 1.20-1.45%, V: 0.020-0.030%.
Step 1: a 120-ton converter is shaken to a molten iron adding position, and a crown block lifts a scrap steel bucket with prepared scrap steel (30 tons) to the front of the converter for adding; hoisting the ladle to the front of the furnace, and adding 125 tons of molten iron into the furnace; the converter was shaken up to the blowing (oxygen blowing) position.
Step 2: the oxygen lance is reduced, the constant pressure lance (pressure) is changed, meanwhile, slagging agent (lime 29kg/t, high magnesium ash 17kg/t, sludge ball 12kg/t, etc.) is added, and slag charge is added in two batches; the early-stage gun position is low (the horizontal position is unchanged, and the height is adjusted to be 1m away from the liquid level of the molten steel), early-stage slag formation and complete slag formation in the process are ensured, and the later-stage gun position is improved (the horizontal position is unchanged, and the height is adjusted to be 1.3m away from the liquid level of the molten steel) to prevent slag from drying back.
And step 3: and after blowing for 13 minutes, lifting the oxygen lance, shaking the furnace to a sampling position, measuring the temperature, sampling, conveying to a test room in front of the furnace for testing, and shaking the furnace right.
And 4, step 4: according to the component requirements: HRB400E high-strength aseismic steel bar, which comprises the following components in percentage by weight: 0.23%, Si: 0.40%, Mn: 1.30%, V: 0.030%, S: 0.035%, P: 0.040%, the following components were weighed: the addition amount of each alloy requires that: carburant: 206kg of vanadium-nitrogen alloy, 59.5kg of vanadium-nitrogen alloy, 261kg of silicon-iron alloy, 2618kg of silicon-manganese alloy and 65kg of micro-nitrogen alloy, and the materials are weighed in place. Wherein the micro nitrogen alloy: n: 25.32%, vanadium-nitrogen alloy V: 78%, carburant C: 90%, silicon-iron alloy Si: 75%, silicon-manganese alloy Mn: 65%, Si: 18 percent.
And 5: component temperature detection results: 0.09% of C, P: 0.026%, S: 0.025%, T: 1675 ℃, according with the requirements, shaking the furnace to the furnace, tapping, driving a ladle car located on a ladle to the furnace, firstly adding 206kg of carburant and 59.5kg of micro-nitrogen alloy at the bottom of the ladle, adding the rest alloy in the tapping process, adding the alloy along with steel flow when tapping 1/4, adding the alloy in the sequence of ferrosilicon, silicomanganese and vanadium-nitrogen, completely adding molten steel when tapping 3/4, adding and opening the bottom of the ladle to blow argon (pressure: 0.60MPa, stirring for 4 minutes).
Step 6: after tapping, the ladle car was driven out and the molten steel was allowed to stand for 7 minutes (pressure: 0.5 MPa); the above smelting is completed.
And 7: the ladle is hoisted to a ladle turret (device), and is provided with a long nozzle to be cast into a continuous casting billet.
And 8: and (3) conveying the continuous casting blank to a bar rolling line, and feeding the continuous casting blank into a heating furnace for heating, wherein the heating temperature of a soaking section is 1120 ℃, and the heating time is 75 min.
And step 9: and (3) carrying out rough rolling, medium rolling and finish rolling on the heated steel billet, and naturally cooling the steel billet on a cooling bed to room temperature to obtain the niobium-vanadium microalloyed HRB400E high-strength anti-seismic steel bar.
Through tests, the parameters of the steel bar prepared in the embodiment 2 are shown in the table 3, and the mechanical properties of the steel are all qualified.
TABLE 3 sample Performance data
The comparison of the cost of the vanadium microalloying (CK) and the production method (HRB400E) of the invention under the same production conditions shows that the invention can reduce the contents of Si and Mn and reduce the addition of Si-Mn and Si-Fe alloy under the same production conditions of the vanadium microalloying high-strength anti-seismic steel bar, as shown in Table 4.
TABLE 4 comparison of phi 12mm specification costs
Claims (9)
1. The preparation method for producing the HRB400E high-strength anti-seismic bar is characterized in that the steel bar comprises the following components in percentage by weight: c: 0.20 to 0.25%, Si: 0.25 to 0.55%, Mn: 1.20-1.45%, V: 0.020-0.040%, and the balance of Fe and impurities, wherein S in the impurities is less than or equal to 0.045%, and P is less than or equal to 0.045%;
adding a carburant and a micro-nitrogen alloy into a steel flow impact area at the bottom of a steel ladle before tapping, strongly stirring bottom-blown argon for 3-4 minutes when the pressure is 0.4-0.6 MPa in the tapping process, adding the alloy in the sequence of ferrosilicon, silicomanganese and vanadium-nitrogen, adding the alloy along with the steel flow when tapping 1/4, and completely adding molten steel when tapping 3/4.
2. The preparation method of HRB400E high-strength aseismic bar according to claim 1, wherein the steel bar is composed of the following components by weight percent: c: 0.20 to 0.25%, Si: 0.25 to 0.55%, Mn: 1.20-1.45%, V: 0.030%, the balance consisting of Fe and impurities, of which: s is less than or equal to 0.045 percent, and P is less than or equal to 0.045 percent.
3. The preparation method for producing the HRB400E high-strength anti-seismic bar according to claim 1 or 2, wherein the micro nitrogen alloy comprises the following components in percentage by weight: n: 23.0-26.0%, C: 1% -3%, Si: 47-49%, Mn: 2% -3%, the balance of Fe and impurities, wherein: s is less than or equal to 0.035%, P is less than or equal to 0.040%.
4. The preparation method for producing the HRB400E high-strength anti-seismic bar according to claim 3, wherein the vanadium nitrogen comprises the following components in percentage by weight: v: 76% -78%, N: 12% -14%, C: less than or equal to 6.0 percent, less than or equal to 1.5 percent of Si, the balance of Fe and impurities, wherein P in the impurities is less than or equal to 0.01 percent, and S is less than or equal to 0.01 percent.
5. The preparation method for producing the HRB400E high-strength anti-seismic bar according to claim 4, wherein the ferrosilicon comprises the following components by weight percent: si: 71-80 percent of Al is less than or equal to 1.5 percent, Ca is less than or equal to 1.0 percent, Mn is less than or equal to 0.5 percent, Cr is less than or equal to 0.5 percent, and the balance is Fe and impurities, wherein P in the impurities is less than or equal to 0.05 percent, and S is less than or equal to 0.03 percent.
6. The preparation method of HRB400E high-strength anti-seismic bar according to claim 5, wherein the silicomanganese comprises the following components by weight percent: mn: 63-72%, Si: 16-20%, C is less than or equal to 2.5%, and the balance is Fe and impurities, wherein P in the impurities is less than or equal to 0.25%, and S is less than or equal to 0.04%.
7. The preparation method for producing the HRB400E high-strength anti-seismic bar according to claim 6, wherein the yield strength of the bar is 425-475 MPa, the tensile strength is 600-640 MPa, the yield ratio is 1.30-1.45, and the yield ratio is 1.05-1.20.
8. The preparation method for producing the HRB400E high-strength anti-seismic bar is characterized in that the steel bar comprises the following components in percentage by weight: c: 0.23%, Si: 0.40%, Mn: 1.30%, V: 0.030%, S: 0.035%, P: 0.040 percent, 204kg of carburant and 65kg of micro-nitrogen alloy are added into a steel stream impact zone at the bottom of the ladle before tapping, argon is blown at the bottom in the tapping process, the mixture is stirred strongly for 3 minutes under the pressure of 0.55MPa, the alloy addition sequence is 261kg of ferrosilicon, 2618kg of silicomanganese and 59.5kg of vanadium-nitrogen, the alloy is added along with the steel stream when tapping 1/4, and the molten steel is completely added when the molten steel is discharged to 3/4.
9. The preparation method for producing the HRB400E high-strength anti-seismic bar is characterized in that the steel bar comprises the following components in percentage by weight: c: 0.23%, Si: 0.40%, Mn: 1.30%, V: 0.030%, S: 0.035%, P: 0.040%, adding 206kg of carburant and 65kg of micro-nitrogen alloy into a steel stream impact zone at the bottom of a ladle before tapping, strongly stirring for 4 minutes under the condition that the pressure of argon blown from the bottom is 0.60MPa in the tapping process, adding the alloy into 261kg of ferrosilicon, 2618kg of silicomanganese and 59.5kg of vanadium-nitrogen in sequence, adding the alloy along with steel stream when tapping 1/4, and completely adding the molten steel when the molten steel is discharged to 3/4.
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|---|---|---|---|---|
| CN113802044A (en) * | 2021-08-02 | 2021-12-17 | 河钢股份有限公司承德分公司 | Alloying method of high-strength anti-seismic steel bar |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5186769A (en) * | 1990-08-16 | 1993-02-16 | The Algoma Steel Corporation, Limited | Seamless steel tube manufacture |
| CN102839318A (en) * | 2012-09-29 | 2012-12-26 | 莱芜钢铁集团有限公司 | HRB600 steel bar and production method thereof |
| CN102851580A (en) * | 2012-09-29 | 2013-01-02 | 莱芜钢铁集团有限公司 | HRB600E aseismic reinforcement steel bar and production method thereof |
| WO2017074738A1 (en) * | 2015-10-30 | 2017-05-04 | Northwestern University | High temperature steel for steam turbine and other applications |
| CN107557653A (en) * | 2017-09-14 | 2018-01-09 | 马鞍山市兴达冶金新材料有限公司 | Micro- nitrogen alloy and its technique for producing high strength cast iron |
| CN110343949A (en) * | 2019-06-21 | 2019-10-18 | 陕西龙门钢铁有限责任公司 | HRB400E high-strength anti-seismic steel bar production method and steel containing niobium vanadium |
| CN111455261A (en) * | 2020-01-11 | 2020-07-28 | 武钢集团昆明钢铁股份有限公司 | Nitrogen-rich vanadium microalloyed large-specification 400MPa high-strength-toughness anti-seismic steel bar and preparation method thereof |
-
2020
- 2020-08-14 CN CN202010819539.5A patent/CN112063911A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5186769A (en) * | 1990-08-16 | 1993-02-16 | The Algoma Steel Corporation, Limited | Seamless steel tube manufacture |
| CN102839318A (en) * | 2012-09-29 | 2012-12-26 | 莱芜钢铁集团有限公司 | HRB600 steel bar and production method thereof |
| CN102851580A (en) * | 2012-09-29 | 2013-01-02 | 莱芜钢铁集团有限公司 | HRB600E aseismic reinforcement steel bar and production method thereof |
| WO2017074738A1 (en) * | 2015-10-30 | 2017-05-04 | Northwestern University | High temperature steel for steam turbine and other applications |
| CN107557653A (en) * | 2017-09-14 | 2018-01-09 | 马鞍山市兴达冶金新材料有限公司 | Micro- nitrogen alloy and its technique for producing high strength cast iron |
| CN110343949A (en) * | 2019-06-21 | 2019-10-18 | 陕西龙门钢铁有限责任公司 | HRB400E high-strength anti-seismic steel bar production method and steel containing niobium vanadium |
| CN111455261A (en) * | 2020-01-11 | 2020-07-28 | 武钢集团昆明钢铁股份有限公司 | Nitrogen-rich vanadium microalloyed large-specification 400MPa high-strength-toughness anti-seismic steel bar and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 陈东辉: "微氮合金+钒氮合金微合金化工艺在高强钢筋生产中的应用", 《山西冶金》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113802044A (en) * | 2021-08-02 | 2021-12-17 | 河钢股份有限公司承德分公司 | Alloying method of high-strength anti-seismic steel bar |
| CN113802044B (en) * | 2021-08-02 | 2022-05-24 | 河钢股份有限公司承德分公司 | Alloying method of high-strength anti-seismic steel bar |
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