CN111893238A - Production process of corrosion-resistant steel bar - Google Patents
Production process of corrosion-resistant steel bar Download PDFInfo
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- CN111893238A CN111893238A CN202010642967.5A CN202010642967A CN111893238A CN 111893238 A CN111893238 A CN 111893238A CN 202010642967 A CN202010642967 A CN 202010642967A CN 111893238 A CN111893238 A CN 111893238A
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/02—Use of electric or magnetic effects
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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
- C21C7/0025—Adding carbon material
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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
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a production process of a corrosion-resistant steel bar, which comprises the following steps: s1 preparing a pure steel melt; s2, sequentially adding a carburant, a silicon-manganese alloy and high-carbon ferromanganese to prepare a mixed molten liquid; s3 forming a ladle; s4, pouring and forming, electrifying and deoxidizing to form a crude reinforcing steel bar product; s5, performing acid washing and alkali washing in an oxygen-free electric field to obtain the finished corrosion-resistant steel bar; the invention has the beneficial effects that: blowing out solid waste slag under an anaerobic condition, adding a carburant, a silicon-manganese alloy and high-carbon ferromanganese into a steel molten liquid, electrifying to remove oxygen by using lime powder, and then sequentially carrying out acid washing and alkali washing to realize high cleanliness, oxidation resistance and corrosion resistance; the high cleanliness is achieved by utilizing electrification for deoxidization and carbon dioxide and/or nitrogen; oxidation resistance and corrosion resistance are realized through a auro mica sheet, chromium iron nitride and ferrotungsten; oxidation resistance and corrosion resistance are realized through a carburant, a silicon-manganese alloy and high-carbon ferromanganese; mixed gas and an electric field are introduced to realize oxidation resistance and corrosion resistance.
Description
Technical Field
The invention relates to the field of steel bar production, in particular to a production process of a corrosion-resistant steel bar.
Background
The steel industry is the basic industry of economic development in China, and the economic development can not be supported by heavy industries such as steel, so the development level of the steel industry is continuously improved, and the steel industry is also the basic premise for meeting the requirements of various aspects of national economy modern construction, such as industries of machinery, civil construction, national defense, transportation and the like. In particular, in recent years, the steel yield of China is the first world and is a world major iron and steel country, and reinforcing steel bars are widely used in industrial and civil buildings as common materials of main supporting and fixing structures in civil and architectural engineering, and the performance of the reinforcing steel bars is directly related to the quality of concrete structures in the buildings; with the rapid development of the basic construction in China, the production process and the use environment of the steel bar are continuously updated and replaced, but a large amount of waste and pollution are generated in the smelting production of the steel bar, which generates great pressure on energy and environmental protection, so that on one hand, the service life of the steel bar can be prolonged, the consumption of steel is reduced, and the pressure is relieved for energy conservation and environmental protection by improving the corrosion resistance and the strength of the steel bar; on the other hand, the production process of the steel bar is optimized, so that pollution and waste gas generation can be reduced.
The steel bar corrosion is one of the main factors influencing the durability of the reinforced concrete structure and is also an important reason for the early failure of major engineering, and particularly under the special severe environment of the ocean and the coupling action of multiple factors of dynamic load and static load, the steel bar corrosion is inevitably aggravated, and the service life of the concrete structure is greatly shortened. For example, chinese patent publication No. CN102605255A discloses a 400 MPa-grade corrosion-resistant steel, which contains the following elements: 0.1 to 0.25 percent of C, 0.5 to 0.90 percent of Si, 0.7 to 1.5 percent of Mn, 0.04 to 0.09 percent of P, less than or equal to 0.015 percent of S, 0.3 to 0.6 percent of Cu, 0.1 to 0.4 percent of Ni, less than or equal to 0.1 percent of Cr, 0.03 to 0.08 percent of V, and the corrosion resistance of the steel bar is improved by 2 times compared with that of the common steel bar, but the lifting space is more limited. Chinese patent publication No. CN105950989B discloses a corrosion-resistant steel bar and a production method thereof, and the corrosion-resistant steel bar comprises the following chemical components: 0.15-0.23% of C, 0.30-0.65% of Si, 0.90-1.60% of Mn, less than or equal to 0.030% of P, less than or equal to 0.020% of S, 1.40-2.50% of Cr1, 0.20-0.40% of Cu, 0.010-0.025% of Ti, less than or equal to 0.015% of N, and less than or equal to 0.0020% of O. The smelting tapping temperature of the induction furnace is 1650-1670 ℃. Controlling the superheat degree of the continuous casting molten steel to be less than or equal to 30 ℃; and deoxidizing the tundish by using an external electric field slag deoxidizing device, wherein the voltage of the external electric field is 5-20V, the current is 600-1000A, and the cleanliness of the molten steel is improved. The heating temperature of rolled steel billets is 1130-1170 ℃, the heating time is 1.5-2.5 h, the initial rolling temperature is 1000-1100 ℃, and the final rolling temperature is 950-1050 ℃; although the cleanliness problem of the steel bars is solved by deoxidizing through the external electric field slag deoxidizing device, the problem that the external surface of the steel bars is easy to oxidize under the marine or humid environment to form a fluffing phenomenon, and the strength of the poured concrete is influenced is not considered.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a production process of a corrosion-resistant steel bar so as to at least achieve the aims of high cleanliness, oxidation resistance and corrosion resistance of steel.
The purpose of the invention is realized by the following technical scheme:
the production process of the corrosion-resistant steel bar comprises the following steps:
s1, selecting high-quality scrap steel, smelting the scrap steel into a steel melt in an electric furnace, and blowing out solid waste slag under an oxygen-free condition to obtain a pure steel melt;
s2, sequentially adding a carburant, a silicon-manganese alloy and high-carbon ferromanganese into the obtained steel melt, and blowing out non-molten slag under an anaerobic condition after the steel melt is melted into liquid to obtain mixed melt;
s3, alloying the mixed molten liquid to obtain primary molten steel; adding lime powder into the obtained primary molten steel, heating to be completely molten under the oxygen-free condition, tapping at 1700-1750 ℃ after the smelting components reach the tapping requirement, and forming a ladle;
s4, hoisting the formed steel ladle into a container, controlling the superheat degree of molten steel in the steel ladle to be less than or equal to 10 ℃, pouring and forming, and simultaneously, powering on to remove oxygen under the anaerobic condition to form a crude reinforcing steel bar product;
and S5, washing the obtained crude reinforcing steel bar with acid, washing with alkali, and performing two stages in an electric field in an oxygen-free condition to obtain the finished corrosion-resistant reinforcing steel bar.
Preferably, in order to further achieve the purpose of high cleanliness, the step of electrifying and deoxidizing is that an external electric field is connected to the upper part of a steel ladle, the anode of the electric field is connected with the outlet of a container, the cathode of the electric field is connected with the inlet of the container, the anode and the cathode of the electric field are respectively connected to the anode and the cathode of an electric field power supply, electrifying is carried out in the pouring stage, carbon dioxide and/or nitrogen are introduced into the whole electric field under the anaerobic condition, and after the oxygen in the molten steel is removed, a crude steel bar product is obtained; the voltage of the external electric field is 30V, and the current is 500A; oxygen atoms attached to impurities in the steel ladle are bombarded out in an electric field in an oxygen-free condition in an electronic bombardment mode, and generated oxygen is expelled out of the steel ladle by using the dioxygen and/or the nitrogen, so that the steel ladle with high cleanliness is formed, and the purpose of high cleanliness is achieved.
Preferably, in order to further realize the purposes of oxidation resistance and corrosion resistance, the alloying is that after the auronite sheet and the chromium iron nitride are sequentially added into the mixed molten liquid for melting, the ferrotungsten alloy is added for alloying, and the solid waste residue is blown out under the anaerobic condition; the weight ratio of the auronite sheet to the ferrochromium nitride to the ferrotungsten is 5:8:9:4, and the total weight of the auronite sheet to the ferrochromium nitride to the ferrotungsten accounts for 6% of the mixed molten liquid; passing through KMg which is the main component in the phlogopite sheet3[Si3AlO10](OH.F)2The alloy is used as a protective agent to protect other alloys from being invaded by oxygen in the melting process, meanwhile, the molten state of the powder can improve the mechanical strength, and the nitrogen formed by austenite in the ferrochromium nitride is matched to replace precious nickel resources.
Preferably, for the purposes of further realizing oxidation resistance and corrosion resistance, the weight ratio of the carburant, the silicon-manganese alloy and the high-carbon ferromanganese is 15:6:3:3, and the total weight of the carburant, the silicon-manganese alloy and the high-carbon ferromanganese accounts for 5% of the molten steel; the weight ratio of each element in the recarburizing agent is C95.45%, S0.075%, volatile matter 1.6%, water 0.45, and the balance of impurities difficult to remove; by adopting the carburant with less sulfur, and the silicon and the manganese in the silicon-manganese alloy can form composite deoxidation, meanwhile, the silicon can improve the mechanical strength of the steel bar, the manganese can avoid the harm of sulfur element and prompt the toughness of the whole steel bar, and the addition of high-carbon ferromanganese is further matched with the carburant to supplement the carbon element and the manganese element lost in the steel melt, thereby realizing the purposes of increasing the oxidation resistance and corrosion resistance of the steel bar by using the carburant, the high-carbon ferromanganese and the silicon-manganese alloy and realizing the oxidation resistance and corrosion resistance.
Preferably, for the purposes of further oxidation resistance and corrosion resistance, the oxygen-free condition is that a mixed gas of argon and krypton with the volume fraction ratio of 6:4 is adopted; the electric field in the anaerobic condition is that two ends of a crude reinforcing steel bar are respectively connected with a 20V power supply through leads, the current is 10A, and meanwhile, the conductive liquid is an aluminum chloride solution with the mass fraction of 15%; by adopting the mixed gas of argon and krypton with the volume fraction of 6:4 and the electric field which is matched with the aluminum chloride solution as the conductive liquid, and plating an aluminum layer on the crude steel bar which is subjected to acid washing and alkali washing by using the electric field, when the crude steel bar is oxidized in a humid environment, the aluminum layer can be firstly oxidized to form a film, and meanwhile, when corrosive liquid is splashed on the steel bar, the aluminum layer can be also firstly oxidized, so that the purposes of oxidation resistance and corrosion resistance are achieved.
The invention has the beneficial effects that:
1. through blowing off solid waste under anaerobic condition, add into the steel melt with carburant, silicon manganese alloy, high carbon ferromanganese simultaneously, and absorb unnecessary moisture simultaneously as deoxidier and slagging constituent with lime powder, thereby prevent that oxygen from invading elementary molten steel and summarize, at the circular telegram deoxidization that utilizes anaerobic condition, reduce the oxygen content in the reinforcing bar by a wide margin, pickling and alkali wash in proper order afterwards, thereby in anaerobic electric field, obtain finished product corrosion resistant reinforcing bar, realize high cleanliness and anti-corrosion purpose of oxidation resistance.
2. Oxygen atoms attached to impurities in the steel ladle are bombarded out in an electric field in an oxygen-free condition in an electronic bombardment mode, and simultaneously, the generated oxygen is expelled out of the steel ladle by utilizing carbon dioxide or nitrogen, so that the steel ladle with high cleanliness is formed, and the purpose of high cleanliness is achieved.
3. Passing through KMg which is the main component in the phlogopite sheet3[Si3AlO10](OH.F)2The alloy is used as a protective agent to protect other alloys from being invaded by oxygen in the melting process, meanwhile, the molten state of the powder can improve the mechanical strength, and the nitrogen formed by austenite in the ferrochromium nitride is matched to replace precious nickel resources.
4. By adopting the carburant with less sulfur, and the silicon and the manganese in the silicon-manganese alloy can form composite deoxidation, meanwhile, the silicon can improve the mechanical strength of the steel bar, the manganese can avoid the harm of sulfur element and prompt the toughness of the whole steel bar, and the addition of high-carbon ferromanganese is further matched with the carburant to supplement the carbon element and the manganese element lost in the steel melt, thereby realizing the purposes of increasing the oxidation resistance and corrosion resistance of the steel bar by using the carburant, the high-carbon ferromanganese and the silicon-manganese alloy and realizing the oxidation resistance and corrosion resistance.
5. By adopting the mixed gas of argon and krypton with the volume fraction of 6:4 and the electric field which is matched with the aluminum chloride solution as the conductive liquid, and plating an aluminum layer on the crude steel bar which is subjected to acid washing and alkali washing by using the electric field, when the crude steel bar is oxidized in a humid environment, the aluminum layer can be firstly oxidized to form a film, and meanwhile, when corrosive liquid is splashed on the steel bar, the aluminum layer can be also firstly oxidized, so that the purposes of oxidation resistance and corrosion resistance are achieved.
Detailed Description
The technical solutions of the present invention are described in further detail below, but the scope of the present invention is not limited to the following.
Example 1
The production process of the corrosion-resistant steel bar comprises the following steps:
s1, selecting high-quality scrap steel, smelting the scrap steel into a steel melt in an electric furnace, and blowing out solid waste slag under an oxygen-free condition to obtain a pure steel melt;
s2, sequentially adding a carburant, a silicon-manganese alloy and high-carbon ferromanganese into the obtained steel melt, and blowing out non-molten slag under an anaerobic condition after the steel melt is melted into liquid to obtain mixed melt;
s3, alloying the mixed molten liquid to obtain primary molten steel; adding lime powder into the obtained primary molten steel, heating to be completely molten under the anaerobic condition, and tapping at 1730 ℃ to form a steel ladle when the smelting components meet the tapping requirement;
s4, hoisting the formed steel ladle into a container, controlling the superheat degree of molten steel in the steel ladle to be less than or equal to 10 ℃, pouring and forming, and simultaneously, powering on to remove oxygen under the anaerobic condition to form a crude reinforcing steel bar product;
and S5, washing the obtained crude reinforcing steel bar with acid, washing with alkali, and performing two stages in an electric field in an oxygen-free condition to obtain the finished corrosion-resistant reinforcing steel bar.
In order to further realize the purpose of high cleanliness, the step of electrifying and deoxidizing is that an external electric field is connected to the upper part of a steel ladle, the anode of the electric field is connected with the outlet of a container, the cathode of the electric field is connected with the inlet of the container, the anode and the cathode are respectively connected to the anode and the cathode of an electric field power supply, electrifying is carried out in the pouring stage, carbon dioxide and/or nitrogen are introduced into the whole electric field under the anaerobic condition, and a crude reinforcing steel bar product is obtained after the oxygen in the molten steel is removed; the voltage of the external electric field is 30V, and the current is 500A; oxygen atoms attached to impurities in the steel ladle are bombarded out in an electric field in an oxygen-free condition in an electronic bombardment mode, and meanwhile, generated oxygen is expelled out of the steel ladle by using carbon dioxide and nitrogen in a volume ratio of 2:3, so that the steel ladle with high cleanliness is formed, and the purpose of high cleanliness is achieved.
To further improveThe aim of oxidation resistance and corrosion resistance is realized, the alloying is that after the auronite sheet and the chromium iron nitride are sequentially added into the mixed molten liquid for melting, the ferrotungsten alloy is added for alloying, and the solid waste residue is blown out under the anaerobic condition; the weight ratio of the auronite sheet to the ferrochromium nitride to the ferrotungsten is 5:8:9:4, and the total weight of the auronite sheet to the ferrochromium nitride to the ferrotungsten accounts for 6% of the mixed molten liquid; passing through KMg which is the main component in the phlogopite sheet3[Si3AlO10](OH,F)2The alloy is used as a protective agent to protect other alloys from being invaded by oxygen in the melting process, meanwhile, the molten state of the powder can improve the mechanical strength, and the nitrogen formed by austenite in the ferrochrome nitride is matched to replace precious nickel resources, and meanwhile, the good high temperature resistance and the mechanical strength of tungsten in the ferrotungsten alloy can be matched with chromium in the ferrochrome nitride to form a highly corrosion-resistant alloy material, so that the alloy material is utilized.
In order to further realize the purposes of oxidation resistance and corrosion resistance, the weight ratio of the carburant, the silicon-manganese alloy and the high-carbon ferromanganese is 15:6:3:3, and the total weight of the carburant, the silicon-manganese alloy and the high-carbon ferromanganese accounts for 5% of the molten steel; the weight ratio of each element in the recarburizing agent is C95.45%, S0.075%, volatile matter 1.6%, water 0.45, and the balance of impurities difficult to remove; by adopting the carburant with less sulfur, and the silicon and the manganese in the silicon-manganese alloy can form composite deoxidation, meanwhile, the silicon can improve the mechanical strength of the steel bar, the manganese can avoid the harm of sulfur element and prompt the toughness of the whole steel bar, and the addition of high-carbon ferromanganese is further matched with the carburant to supplement the carbon element and the manganese element lost in the steel melt, thereby realizing the purposes of increasing the oxidation resistance and corrosion resistance of the steel bar by using the carburant, the high-carbon ferromanganese and the silicon-manganese alloy and realizing the oxidation resistance and corrosion resistance.
For the purposes of further oxidation resistance and corrosion resistance, the oxygen-free condition is that a mixed gas of argon and krypton with the volume fraction ratio of 6:4 is adopted; the electric field in the anaerobic condition is that two ends of a crude reinforcing steel bar are respectively connected with a 20V power supply through leads, the current is 10A, and meanwhile, the conductive liquid is an aluminum chloride solution with the mass fraction of 15%; by adopting the mixed gas of argon and krypton with the volume fraction of 6:4 and the electric field which is matched with the aluminum chloride solution as the conductive liquid, and plating an aluminum layer on the crude steel bar which is subjected to acid washing and alkali washing by using the electric field, when the crude steel bar is oxidized in a humid environment, the aluminum layer can be firstly oxidized to form a film, and meanwhile, when corrosive liquid is splashed on the steel bar, the aluminum layer can be also firstly oxidized, so that the purposes of oxidation resistance and corrosion resistance are achieved.
Through detection, the corrosion-resistant steel bar comprises the following chemical components in percentage by weight: c: 0.31% -0.35%, Si: 0.44% -0.71%, Mn: 1.53-2.14%, P is less than or equal to 0.043%, S is less than or equal to 0.015%, Cr: 2.31% -2.86%, Cu: 0.14-0.19%, Al: 1.37% -1.55%, Mg: 0.17 to 0.35 percent of the total weight of the alloy, less than or equal to 0.084 percent of K, less than or equal to 0.024 percent of N, less than or equal to 0.0018 percent of O, and the balance of iron and inevitable impurities.
Example 2
Tapping is carried out at a tapping temperature of 1700 c while removing the generated oxygen out of the ladle using carbon dioxide, and the rest of the formulation and steps are the same as those of example 1.
Example 3
Tapping is carried out at a tapping temperature of 1750 ℃, generated oxygen is expelled from a ladle by using nitrogen, and the rest of the formula and the steps are the same as those of the example 1.
Comparative example 1
The formulation and procedure were the same as in example 1 except that the oxygen was removed without applying electric current.
Comparative example 2
The crude reinforcing steel bar product is directly modified by a grinding rod without acid cleaning and alkali cleaning, electroplating is carried out in an electric field under an oxygen-free condition, and the rest formula and steps are the same as those in the embodiment 1.
Comparative example 3
Adding carburant, ferro-silico-manganese and ferro-silicon into molten steel for deoxidation and alloying, then adding ferrochrome and ferro-titanium for alloying, and the rest formula and steps are the same as those in example 1.
The oxygen content and mechanical hardness of the corrosion-resistant steel bars obtained in each example and comparative example were counted, and the ratio of the corroded area to the original steel bar area was measured by an eddy current probe method after the steel bars were placed in a humid environment with an acidic relative humidity of 96% and a pH of 2 for 180 days, to obtain table 1.
TABLE 1 Corrosion, oxygen content and mechanical hardness of the steel bars in each of the examples and comparative examples
| Categories | Oxygen content (‰) | Mechanical hardness MPa | Degree of Corrosion (%) |
| Example 1 | 0.08 | 1180 | 2 |
| Example 2 | 0.10 | 1175 | 3 |
| Example 3 | 0.09 | 1181 | 3 |
| Comparative example 1 | 0.45 | 1008 | 12 |
| Comparative example 2 | 0.11 | 1168 | 4 |
| Comparative example 3 | 0.13 | 1080 | 9 |
As can be seen from table 1, when the solid waste slag is blown out under the anaerobic condition, the recarburizer, the silicon-manganese alloy and the high-carbon ferromanganese are sequentially added into the molten steel for deoxidation and preliminary alloying, meanwhile, the generated oxygen is expelled out of the steel ladle by using carbon dioxide and nitrogen with the volume ratio of 2:3, the phlogopite, the chromium nitride iron and the ferrotungsten alloy are added for alloying, and electroplating is performed after electrification for deoxidation and acid and alkali washing, and the finished corrosion-resistant steel bar is obtained, wherein the weight percentage of the chemical components of the finished corrosion-resistant steel bar are as follows: c: 0.31% -0.35%, Si: 0.44% -0.71%, Mn: 1.53-2.14%, P is less than or equal to 0.043%, S is less than or equal to 0.015%, Cr: 2.31% -2.86%, Cu: 0.14-0.19%, Al: 1.37% -1.55%, Mg: 0.17-0.35 percent, less than or equal to 0.084 percent of K, less than or equal to 0.024 percent of N, 0.08 percent of O, 1180MPa of mechanical hardness and 2 percent of corrosion, thus the superiority of the finished product of the steel bar is illustrated.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The production process of the corrosion-resistant steel bar is characterized by comprising the following steps of: the method comprises the following steps:
s1, selecting high-quality scrap steel, smelting the scrap steel into a steel melt in an electric furnace, and blowing out solid waste slag under an oxygen-free condition to obtain a pure steel melt;
s2, sequentially adding a carburant, a silicon-manganese alloy and high-carbon ferromanganese into the obtained steel melt, and blowing out non-molten slag under an anaerobic condition after the steel melt is melted into liquid to obtain mixed melt;
s3, alloying the mixed molten liquid to obtain primary molten steel; adding lime powder into the obtained primary molten steel, heating to be completely molten under the oxygen-free condition, tapping at 1700-1750 ℃ after the smelting components reach the tapping requirement, and forming a ladle;
s4, hoisting the formed steel ladle into a container, controlling the superheat degree of molten steel in the steel ladle to be less than or equal to 10 ℃, pouring and forming, and simultaneously, powering on to remove oxygen under the anaerobic condition to form a crude reinforcing steel bar product;
and S5, washing the obtained crude reinforcing steel bar with acid, washing with alkali, and performing two stages in an electric field in an oxygen-free condition to obtain the finished corrosion-resistant reinforcing steel bar.
2. The process for producing a corrosion-resistant reinforcing steel bar according to claim 1, wherein: the method is characterized in that an external electric field is connected to the upper part of the steel ladle, the anode of the electric field is connected with the outlet of the container, the cathode of the electric field is connected with the inlet of the container, the anode and the cathode of the electric field are respectively connected to the anode and the cathode of an electric field power supply, the electric field is electrified in the pouring stage, carbon dioxide and/or nitrogen are introduced into the whole electric field under the anaerobic condition, and the crude steel bar is obtained after the oxygen in the molten steel is removed.
3. The process for producing a corrosion-resistant reinforcing bar according to claim 1 or 2, wherein: the voltage of the external electric field is 30V, and the current is 500A.
4. The process for producing a corrosion-resistant reinforcing steel bar according to claim 1, wherein: the alloying is that after the auronite sheet and the chromium iron nitride are added into the mixed molten liquid in sequence for melting, the ferrotungsten alloy is added for alloying, and the solid waste residue is blown out under the anaerobic condition.
5. The process of claim 4, wherein the steel bar is produced by the following steps: the weight ratio of the auronite sheet to the ferrochromium nitride to the ferrotungsten is 5:8:9:4, and the total weight of the auronite sheet to the ferrochromium nitride to the ferrotungsten accounts for 6% of the mixed molten liquid.
6. The process for producing a corrosion-resistant reinforcing steel bar according to claim 1, wherein: the weight ratio of the carburant, the silicon-manganese alloy and the high-carbon ferromanganese is 15:6:3:3, and the total weight of the carburant, the silicon-manganese alloy and the high-carbon ferromanganese accounts for 5% of the molten steel.
7. The process of claim 6, wherein the steel bar is produced by the following steps: the weight ratio of each element in the recarburizing agent is C95.45%, S0.075%, volatile matter 1.6%, water 0.45, and the balance of impurities difficult to remove.
8. The process for producing a corrosion-resistant reinforcing steel bar according to claim 1, wherein: the oxygen-free condition is that mixed gas of argon and krypton with the volume fraction ratio of 6:4 is adopted.
9. The process of claim 8, wherein the steel bar is produced by the following steps: the electric field in the anaerobic condition is that two ends of a crude reinforcing steel bar are respectively connected with a 20V power supply through leads, the current is 10A, and meanwhile, the conductive liquid is an aluminum chloride solution with the mass fraction of 15%.
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