CN111719084A - Production method of titanium-containing thick outlet alloy steel with extremely low cost - Google Patents
Production method of titanium-containing thick outlet alloy steel with extremely low cost Download PDFInfo
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Abstract
The invention discloses a production method of extremely low-cost titanium-containing thick export alloy steel, which relates to the technical field of steel smelting, and comprises the following chemical components in percentage by mass: c: 0.09-0.20 percent, less than 0.55 percent of Si, less than 1.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, less than 0.20 percent of V, Ti: 0.050% -0.20%, Cr < 0.30%, Ni < 0.30%, Cu < 0.40%, N < 0.0120%, Al: 0.015 to 0.050 percent, and the balance of Fe and inevitable impurities. Converter smelting, LF desulfurization alloying, RH vacuum treatment, continuous casting and casting, high-temperature austenitizing technology, full play of alloy strengthening effect, rolling and cooling technology, and ferrite and pearlite based tissue type, which meets the matching of strength and toughness of products and meets the performance requirements of client products.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a production method of titanium-containing thick export alloy steel with extremely low cost.
Background
With the economic development of China, the steel consumption is increased day by day, and the scale of steel mills is increased day by day. At present, the crude steel yield of China reaches more than 10 hundred million tons, which accounts for about 60 percent of the steel yield of the world, the development of the steel industry promotes the competitive between steel plants of China, and the quality of steel products is stably improved. In order to improve the competitiveness of steel enterprises in China worldwide, the state implements a tax refund policy on high-grade steel, particularly alloy steel of special variety types, and refunds according to 5% -13% of the price of steel per ton. Therefore, each enterprise carries out deep research on tax refunds, reduces cost, improves quality and strives to develop an international market.
The steel mills in the Yangtze river economic zone area have obvious geographic advantages, but lack mines, and the transportation cost of the raw materials is imported and exported, so that great pressure is brought to the external competition of enterprises, and the steel mills develop low-cost and high-quality alloy steel exports under the guidance of national preferential policies, and are of great importance to important links in the stable world supply chain of the enterprises. Titanium element belongs to the cheapest element in the alloy, the high titanium element is adopted to design and export the product with the lowest cost, the ultralow-cost manufacturing of titanium tax refunding is continuously researched and developed, the high-quality titanium-containing thick alloy steel is produced, and the strong guarantee can be provided for the further development of enterprises in the international iron and steel industry.
Disclosure of Invention
In order to solve the technical problems, the invention provides a production method of titanium-containing thick outlet alloy steel with extremely low cost, which comprises the following chemical components in percentage by mass: c: 0.09-0.20 percent, less than 0.55 percent of Si, less than 1.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, less than 0.20 percent of V, Ti: 0.050% -0.20%, Cr < 0.30%, Ni < 0.30%, Cu < 0.40%, N < 0.0120%, Al: 0.015 to 0.050 percent, and the balance of Fe and inevitable impurities;
the method specifically comprises the following steps:
s1, after the molten iron flows backwards, performing molten iron pretreatment desulfurization operation, and after desulfurization, ensuring that slag skimming is clean;
s2, smelting in a converter by adopting a top-bottom combined blowing technology, wherein the tapping temperature is 1640-1680 ℃;
s3, after temperature measurement and sampling by an LF furnace, deoxidizing by adopting a composite deoxidizing mode, desulfurizing and alloying after oxygen determination, and adding ferrotitanium at the later stage of alloying to ensure that the components meet the design requirements of products;
s4, carrying out vacuum treatment operation in an RH furnace, carrying out calcium treatment by adopting a seamless calcium line after the vacuum treatment is finished, and stirring statically after the calcium treatment;
s5, carrying out continuous casting full-protection casting on the molten steel after vacuum treatment to ensure that the molten steel has no secondary oxidation, and adopting dynamic soft reduction and electromagnetic stirring technology to ensure that the macroscopic structure adopts the Mandarin rating of 2 grade or better;
s6, austenitizing temperature of 1120 +/-20 ℃, and soaking time of more than or equal to 40 min;
s7, adopting a TMCP rolling process, controlling the secondary opening temperature to be 750-850 ℃, the final rolling temperature to be 750-790 ℃, the water inlet temperature to be 710-740 ℃, and the red returning temperature to be 300-600 ℃.
The technical effects are as follows: the invention adopts converter smelting, LF desulfurization alloying and RH vacuum treatment, obtains the aluminum killed steel with macrostructure meeting the Manjun 2 grade or better through continuous casting, fully exerts the alloy strengthening function through a high-temperature austenitizing technology, obtains the structure type mainly comprising ferrite and pearlite by adopting a rolling cooling technology, meets the matching of the strength and the toughness of the product, and meets the performance requirements of the client product.
The technical scheme of the invention is further defined as follows:
the production method of the titanium-containing thick outlet alloy steel with extremely low cost specifically comprises the following steps:
s1, performing molten iron pretreatment desulfurization operation after molten iron flows backward, ensuring that slagging is clean after desulfurization, and ensuring that S of molten iron entering a furnace is less than or equal to 0.010%;
s2, converter smelting is carried out by adopting a top-bottom combined blowing technology, the tapping temperature is 1640-1680 ℃, and the tapping C: 0.060% -0.10%, P is less than or equal to 0.025%, and the oxygen determination target of the sublance is 300-600 ppm;
s3, after temperature measurement and sampling are carried out by an LF furnace, deoxidation is carried out by adopting a composite deoxidation mode, desulfurization and alloying operation are carried out after the oxygen content is less than 15ppm, and ferrotitanium is added in the later alloying stage to ensure that the components meet the design requirements of products;
s4, carrying out vacuum treatment operation in an RH furnace, wherein the vacuum degree is less than or equal to 0.3mbar, the vacuum treatment time is more than or equal to 12min, carrying out calcium treatment by adopting a seamless calcium line after the vacuum treatment is finished, and the static stirring time after the calcium treatment is more than or equal to 12 min;
s5, carrying out continuous casting full-protection casting on the molten steel after vacuum treatment to ensure that the molten steel has no secondary oxidation, and adopting dynamic soft reduction and electromagnetic stirring technology to ensure that the macroscopic structure adopts the Mandarin rating of 2 grade or better;
s6, austenitizing temperature of 1120 +/-10 ℃, and soaking time of more than or equal to 40 min;
s7, adopting a TMCP rolling process, controlling the secondary opening temperature to be 750-850 ℃, the final rolling temperature to be 750-790 ℃, the water inlet temperature to be 710-740 ℃, the red returning temperature to be 300-600 ℃, the roller speed to be 0.2-0.8 m/S, and the acceleration to be 0.002-0.008 m/S2。
The production method of the titanium-containing thick export alloy steel with extremely low cost has the product thickness specification of 20-100 mm.
The method for producing the titanium-containing thick-specification outlet alloy steel at the extremely low cost is used for producing alloy steel plates of S235JR-Ti, S275JR-Ti, S355JR-Ti grades and the like.
The production method of the extremely-low-cost titanium-containing thick-specification outlet alloy steel is used for producing S235JR-Ti alloy steel, and comprises the following chemical components in percentage by mass: c: 0.150% -0.20%, Si: 0.20-0.40%, Mn: 0.40-0.60%, P is less than or equal to 0.025%, S is less than or equal to 0.010%, V is less than 0.20%, Ti: 0.050% -0.10%, Cr is less than or equal to 0.20%, Ni is less than 0.30%, Cu is less than 0.40%, N is less than 0.0120%, Al: 0.015 to 0.050 percent, and the balance of Fe and inevitable impurities;
the method specifically comprises the following steps:
s1, performing molten iron pretreatment desulfurization operation after molten iron flows backward, ensuring that slagging is clean after desulfurization, and ensuring that S of molten iron entering a furnace is less than or equal to 0.010%;
s2, smelting in a converter by adopting a top-bottom combined blowing technology, wherein the tapping temperature is 1640-1660 ℃, and the tapping C: 0.060% -0.08%, P is less than or equal to 0.021%, and the oxygen determination target of the sublance is 400-600 ppm;
s3, after temperature measurement and sampling by an LF furnace, deoxidizing by adopting a composite deoxidation mode, determining oxygen by 10ppm, then desulfurizing and alloying, and adding ferrotitanium at the later stage of alloying to ensure that the components meet the design requirements of products;
s4, carrying out vacuum treatment operation in an RH furnace, wherein the vacuum degree is less than or equal to 0.1mbar, the vacuum treatment time is more than or equal to 15min, carrying out calcium treatment by adopting a seamless calcium line after the vacuum treatment is finished, and the static stirring time after the calcium treatment is more than or equal to 13 min;
s5, carrying out continuous casting full-protection casting on the molten steel after vacuum treatment to ensure that the molten steel has no secondary oxidation, and adopting dynamic soft reduction and electromagnetic stirring technology to ensure that the macroscopic structure adopts the Mandarin rating of 2 grade or better;
s6, austenitizing temperature is 1120 +/-10 ℃, and soaking time is more than or equal to 45 min;
s7, adopting a TMCP rolling process, controlling the secondary opening temperature to be 800-850 ℃, the final rolling temperature to be 770-790 ℃, the water inlet temperature to be 730-740 ℃, the red returning temperature to be 450-600 ℃, the roller speed to be 0.5-0.8 m/S, and the acceleration to be 0.002-0.006 m/S2。
The method for producing the titanium-containing thick outlet alloy steel with extremely low cost is used for producing the S275JR-Ti alloy steel, and comprises the following chemical components in percentage by mass: c: 0.09% -0.15%, Si: 0.15-0.35%, Mn: 0.60-0.90%, P is less than or equal to 0.025%, S is less than or equal to 0.010%, V is less than 0.20%, Ti: 0.10-0.20%, Cr < 0.30%, Ni < 0.30%, Cu < 0.40%, N < 0.0120%, Al: 0.015 to 0.050 percent, and the balance of Fe and inevitable impurities;
the method specifically comprises the following steps:
s1, performing molten iron pretreatment desulfurization operation after molten iron flows backward, ensuring that slagging is clean after desulfurization, and ensuring that S of molten iron entering a furnace is less than or equal to 0.010%;
s2, converter smelting is carried out by adopting a top-bottom combined blowing technology, the tapping temperature is 1660-1680 ℃, and the tapping C: 0.080-0.10 percent, less than or equal to 0.021 percent of P and 300-500 ppm of sublance oxygen determination target;
s3, after temperature measurement and sampling by an LF furnace, deoxidizing by adopting a composite deoxidation mode, determining oxygen by 10ppm, then desulfurizing and alloying, and adding ferrotitanium at the later stage of alloying to ensure that the components meet the design requirements of products;
s4, carrying out vacuum treatment operation in an RH furnace, wherein the vacuum degree is less than or equal to 0.1mbar, the vacuum treatment time is more than or equal to 15min, carrying out calcium treatment by adopting a seamless calcium line after the vacuum treatment is finished, and the static stirring time after the calcium treatment is more than or equal to 13 min;
s5, carrying out continuous casting full-protection casting on the molten steel after vacuum treatment to ensure that the molten steel has no secondary oxidation, and adopting dynamic soft reduction and electromagnetic stirring technology to ensure that the macroscopic structure adopts the Mandarin rating of 2 grade or better;
s6, austenitizing temperature is 1120 +/-10 ℃, and soaking time is more than or equal to 45 min;
s7, adopting a TMCP rolling process, controlling the secondary opening temperature to be 750-800 ℃, the final rolling temperature to be 750-770 ℃, the water inlet temperature to be 710-730 ℃, the red returning temperature to be 300-450 ℃, the roller speed to be 0.2-0.6 m/S, and the acceleration to be 0.002-0.006 m/S2。
The invention has the beneficial effects that:
(1) according to the invention, the C can effectively improve the strength of steel, the cost of the carbon element is lowest, and the product cost can be effectively reduced; mn can play a role in solid solution strengthening, can form sulfides, reduces the harm of sulfur, and can be gathered in austenite to improve the stability of the austenite; ti can improve the strength of the product, but Ti is active and is easy to generate large inclusions with single particles, and the inclusions are extremely difficult to remove, so that the mechanical property of the product is influenced, and a proper range design is required;
(2) the invention meets the national alloy tax refunding requirement of titanium tax refunding, adopts the low-carbon manganese design concept, effectively reduces the alloy cost design, reduces the manufacturing cost of the product and ensures the quality requirement of the product;
(3) according to the characteristics of elements, the sulfur content requirement is reduced by product design, the oxygen content in the LF treatment process is reduced, the alloying of the titanium element is carried out after oxygen determination, the formation of inclusions of titanium oxide and titanium nitride is effectively reduced, the technical problem of unstable impact toughness of the titanium-containing alloy steel which is troublesome is solved, the alloy cost is reduced, and the product performance is stabilized;
(4) the full-protection casting in the continuous casting process reduces the secondary pollution of the molten steel, avoids the formation of large inclusions caused by secondary oxidation in the casting process, improves the purity of the molten steel, and meets the stability of the product performance;
(5) according to the invention, through a low-temperature austenitizing process and a rolling cooling technology, the structure grain size is effectively reduced, the fine-grained structure of the product is ensured, the strength and toughness of the product are improved, the structure type mainly comprising ferrite pearlite is obtained, the mechanical property of the product is stabilized, and the market universality of the product is strong.
Drawings
FIG. 1 is a thickness-wise metallographic structure of the product of example 1;
FIG. 2 is a thickness-wise metallographic structure of the product of example 2.
Detailed Description
Example 1
The method for producing the titanium-containing thick outlet alloy steel with extremely low cost according to the embodiment produces S235JR-Ti alloy steel with a product specification of 32mm 3650mm 12000mm, and comprises the following chemical components in percentage by mass: c: 0.17%, Si: 0.30%, Mn: 0.56%, P: 0.016%, S: 0.008%, V: 0.0020%, Ti: 0.13%, Cr: 0.030%, Ni: 0.05%, Cu: 0.020%, N: 0.0050%, Al: 0.031%, and the balance Fe and inevitable impurities.
The method specifically comprises the following steps:
s1, after the molten iron flows backwards, performing molten iron pretreatment desulfurization operation, after desulfurization, ensuring that slagging-off is clean, and feeding molten iron into a furnace S: 0.008 percent;
s2, converter smelting is carried out by adopting a top-bottom combined blowing technology, the tapping temperature is 1652 ℃, and tapping C: 0.080%, P: 0.015 percent and a sublance oxygen determination target of 500 ppm;
s3, after temperature measurement and sampling by an LF furnace, deoxidizing by adopting a composite deoxidation mode, determining oxygen by 11ppm, performing desulfurization and alloying operation, and adding ferrotitanium at the later stage of alloying to ensure that the components meet the design requirements of products;
s4, carrying out vacuum treatment operation in an RH furnace, wherein the vacuum degree is 0.1mbar, the vacuum treatment time is 13min, carrying out calcium treatment by adopting a seamless calcium line after the vacuum treatment is finished, and standing and stirring for 15min after the calcium treatment;
s5, carrying out continuous casting full-protection casting on the molten steel after vacuum treatment to ensure that the molten steel has no secondary oxidation, and adopting dynamic soft reduction and electromagnetic stirring technology to ensure that the macroscopic structure adopts the Mandarin rating of 2 grade or better;
s6, austenitizing temperature of 1120 ℃, and soaking time of 42 min;
s7, adopting TMCP rolling process, controlling the secondary opening temperature of 790 ℃, the final rolling temperature of 785 ℃, the water inlet temperature of 739 ℃, the re-reddening temperature of 580 ℃, the rolling speed of 0.6m/S and the acceleration of 0.006m/S2。
Example 2
The method for producing the titanium-containing thick outlet alloy steel with the extremely low cost provided by the embodiment is used for producing S275JR-Ti alloy steel, the product specification is 60mm 4436mm 12000mm, and the chemical components and the mass percentage are as follows: c: 0.12%, Si: 0.22%, Mn: 0.86%, P: 0.013%, S: 0.008%, V: 0.001%, Ti: 0.17%, Cr: 0.05%, Ni: 0.05%, Cu: 0.03%, N: 0.0035%, Al: 0.033% and the balance Fe and inevitable impurities.
The method specifically comprises the following steps:
s1, after the molten iron flows backwards, performing molten iron pretreatment desulfurization operation, after desulfurization, ensuring that slagging-off is clean, and feeding molten iron into a furnace S: 0.010%;
s2, converter smelting is carried out by adopting a top-bottom combined blowing technology, the tapping temperature is 1649 ℃, and the tapping C: 0.050%, P: 0.015 percent and a sublance oxygen determination target of 600 ppm;
s3, after temperature measurement and sampling by an LF furnace, deoxidizing by adopting a composite deoxidation mode, determining oxygen by 12ppm, performing desulfurization and alloying operation, and adding ferrotitanium at the later stage of alloying to ensure that the components meet the design requirements of products;
s4, carrying out vacuum treatment operation in an RH furnace, wherein the vacuum degree is 0.1mbar, the vacuum treatment time is 12min, carrying out calcium treatment by adopting a seamless calcium line after the vacuum treatment is finished, and carrying out static stirring for 12min after the calcium treatment;
s5, carrying out continuous casting full-protection casting on the molten steel after vacuum treatment to ensure that the molten steel has no secondary oxidation, and adopting dynamic soft reduction and electromagnetic stirring technology to ensure that the macroscopic structure adopts the Mandarin rating of 2 grade or better;
s6, austenitizing temperature 1116 ℃, and soaking time 42 min;
s7, adopting TMCP rolling process, controlling the temperature of two-opening at 755 ℃, the temperature of final rolling at 760 ℃, the temperature of water entering at 719 ℃, the temperature of red returning at 360 ℃, the speed of rollers at 0.3m/S and the acceleration at 0.002m/S2。
The mechanical properties of the products obtained in example 1 and example 2 were measured, and the results are shown in the following table:
meanwhile, as can be seen from fig. 1 and 2, the products of examples 1 and 2 have a structure type mainly including ferrite and pearlite, and the strength and toughness of the products are well matched through performance tests. The invention adopts the design idea of high titanium alloy, adopts the pure steel smelting process and the rolling cooling technology, meets the requirements of customers on performance and reduces the production cost.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (6)
1. A production method of extremely low-cost titanium-containing thick outlet alloy steel is characterized by comprising the following steps:
the chemical components and the mass percentage are as follows: c: 0.09-0.20 percent, less than 0.55 percent of Si, less than 1.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, less than 0.20 percent of V, Ti: 0.050% -0.20%, Cr < 0.30%, Ni < 0.30%, Cu < 0.40%, N < 0.0120%, Al: 0.015 to 0.050 percent, and the balance of Fe and inevitable impurities;
the method specifically comprises the following steps:
s1, after the molten iron flows backwards, performing molten iron pretreatment desulfurization operation, and after desulfurization, ensuring that slag skimming is clean;
s2, smelting in a converter by adopting a top-bottom combined blowing technology, wherein the tapping temperature is 1640-1680 ℃;
s3, after temperature measurement and sampling by an LF furnace, deoxidizing by adopting a composite deoxidizing mode, desulfurizing and alloying after oxygen determination, and adding ferrotitanium at the later stage of alloying to ensure that the components meet the design requirements of products;
s4, carrying out vacuum treatment operation in an RH furnace, carrying out calcium treatment by adopting a seamless calcium line after the vacuum treatment is finished, and stirring statically after the calcium treatment;
s5, carrying out continuous casting full-protection casting on the molten steel after vacuum treatment to ensure that the molten steel has no secondary oxidation, and adopting dynamic soft reduction and electromagnetic stirring technology to ensure that the macroscopic structure adopts the Mandarin rating of 2 grade or better;
s6, austenitizing temperature of 1120 +/-20 ℃, and soaking time of more than or equal to 40 min;
s7, adopting a TMCP rolling process, controlling the secondary opening temperature to be 750-850 ℃, the final rolling temperature to be 750-790 ℃, the water inlet temperature to be 710-740 ℃, and the red returning temperature to be 300-600 ℃.
2. The method for producing the titanium-containing thick-gauge outlet alloy steel with extremely low cost according to claim 1, is characterized in that:
the method specifically comprises the following steps:
s1, performing molten iron pretreatment desulfurization operation after molten iron flows backward, ensuring that slagging is clean after desulfurization, and ensuring that S of molten iron entering a furnace is less than or equal to 0.010%;
s2, converter smelting is carried out by adopting a top-bottom combined blowing technology, the tapping temperature is 1640-1680 ℃, and the tapping C: 0.060% -0.10%, P is less than or equal to 0.025%, and the oxygen determination target of the sublance is 300-600 ppm;
s3, after temperature measurement and sampling are carried out by an LF furnace, deoxidation is carried out by adopting a composite deoxidation mode, desulfurization and alloying operation are carried out after the oxygen content is less than 15ppm, and ferrotitanium is added in the later alloying stage to ensure that the components meet the design requirements of products;
s4, carrying out vacuum treatment operation in an RH furnace, wherein the vacuum degree is less than or equal to 0.3mbar, the vacuum treatment time is more than or equal to 12min, carrying out calcium treatment by adopting a seamless calcium line after the vacuum treatment is finished, and the static stirring time after the calcium treatment is more than or equal to 12 min;
s5, carrying out continuous casting full-protection casting on the molten steel after vacuum treatment to ensure that the molten steel has no secondary oxidation, and adopting dynamic soft reduction and electromagnetic stirring technology to ensure that the macroscopic structure adopts the Mandarin rating of 2 grade or better;
s6, austenitizing temperature of 1120 +/-10 ℃, and soaking time of more than or equal to 40 min;
s7, adopting a TMCP rolling process, controlling the secondary opening temperature to be 750-850 ℃, the final rolling temperature to be 750-790 ℃, the water inlet temperature to be 710-740 ℃, the red returning temperature to be 300-600 ℃, the roller speed to be 0.2-0.8 m/S, and the acceleration to be 0.002-0.008 m/S2。
3. The method for producing the titanium-containing thick-gauge outlet alloy steel with extremely low cost according to claim 1, is characterized in that: the thickness specification of the product is 20-100 mm.
4. The method for producing the titanium-containing thick-gauge outlet alloy steel with extremely low cost according to claim 1, is characterized in that: used for producing alloy steel plates of S235JR-Ti, S275JR-Ti, S355JR-Ti grades and the like.
5. The method for producing the extremely low-cost titanium-containing thick-gauge outlet alloy steel according to claim 4, is characterized in that:
the S235JR-Ti alloy steel is produced by the following chemical components in percentage by mass: c: 0.150% -0.20%, Si: 0.20-0.40%, Mn: 0.40-0.60%, P is less than or equal to 0.025%, S is less than or equal to 0.010%, V is less than 0.20%, Ti: 0.050% -0.10%, Cr is less than or equal to 0.20%, Ni is less than 0.30%, Cu is less than 0.40%, N is less than 0.0120%, Al: 0.015 to 0.050 percent, and the balance of Fe and inevitable impurities;
the method specifically comprises the following steps:
s1, performing molten iron pretreatment desulfurization operation after molten iron flows backward, ensuring that slagging is clean after desulfurization, and ensuring that S of molten iron entering a furnace is less than or equal to 0.010%;
s2, smelting in a converter by adopting a top-bottom combined blowing technology, wherein the tapping temperature is 1640-1660 ℃, and the tapping C: 0.060% -0.08%, P is less than or equal to 0.021%, and the oxygen determination target of the sublance is 400-600 ppm;
s3, after temperature measurement and sampling by an LF furnace, deoxidizing by adopting a composite deoxidation mode, determining oxygen by 10ppm, then desulfurizing and alloying, and adding ferrotitanium at the later stage of alloying to ensure that the components meet the design requirements of products;
s4, carrying out vacuum treatment operation in an RH furnace, wherein the vacuum degree is less than or equal to 0.1mbar, the vacuum treatment time is more than or equal to 15min, carrying out calcium treatment by adopting a seamless calcium line after the vacuum treatment is finished, and the static stirring time after the calcium treatment is more than or equal to 13 min;
s5, carrying out continuous casting full-protection casting on the molten steel after vacuum treatment to ensure that the molten steel has no secondary oxidation, and adopting dynamic soft reduction and electromagnetic stirring technology to ensure that the macroscopic structure adopts the Mandarin rating of 2 grade or better;
s6, austenitizing temperature is 1120 +/-10 ℃, and soaking time is more than or equal to 45 min;
s7, adopting a TMCP rolling process, controlling the secondary opening temperature to be 800-850 ℃, the final rolling temperature to be 770-790 ℃, the water inlet temperature to be 730-740 ℃, the red returning temperature to be 450-600 ℃, the roller speed to be 0.5-0.8 m/S, and the acceleration to be 0.002-0.006 m/S2。
6. The method for producing the extremely low-cost titanium-containing thick-gauge outlet alloy steel according to claim 4, is characterized in that:
the S275JR-Ti alloy steel is produced by the following chemical components in percentage by mass: c: 0.09% -0.15%, Si: 0.15-0.35%, Mn: 0.60-0.90%, P is less than or equal to 0.025%, S is less than or equal to 0.010%, V is less than 0.20%, Ti: 0.10-0.20%, Cr < 0.30%, Ni < 0.30%, Cu < 0.40%, N < 0.0120%, Al: 0.015 to 0.050 percent, and the balance of Fe and inevitable impurities;
the method specifically comprises the following steps:
s1, performing molten iron pretreatment desulfurization operation after molten iron flows backward, ensuring that slagging is clean after desulfurization, and ensuring that S of molten iron entering a furnace is less than or equal to 0.010%;
s2, converter smelting is carried out by adopting a top-bottom combined blowing technology, the tapping temperature is 1660-1680 ℃, and the tapping C: 0.080-0.10 percent, less than or equal to 0.021 percent of P and 300-500 ppm of sublance oxygen determination target;
s3, after temperature measurement and sampling by an LF furnace, deoxidizing by adopting a composite deoxidation mode, determining oxygen by 10ppm, then desulfurizing and alloying, and adding ferrotitanium at the later stage of alloying to ensure that the components meet the design requirements of products;
s4, carrying out vacuum treatment operation in an RH furnace, wherein the vacuum degree is less than or equal to 0.1mbar, the vacuum treatment time is more than or equal to 15min, carrying out calcium treatment by adopting a seamless calcium line after the vacuum treatment is finished, and the static stirring time after the calcium treatment is more than or equal to 13 min;
s5, carrying out continuous casting full-protection casting on the molten steel after vacuum treatment to ensure that the molten steel has no secondary oxidation, and adopting dynamic soft reduction and electromagnetic stirring technology to ensure that the macroscopic structure adopts the Mandarin rating of 2 grade or better;
s6, austenitizing temperature is 1120 +/-10 ℃, and soaking time is more than or equal to 45 min;
s7, adopting a TMCP rolling process, controlling the secondary opening temperature to be 750-800 ℃, the final rolling temperature to be 750-770 ℃, the water inlet temperature to be 710-730 ℃, the red returning temperature to be 300-450 ℃, the roller speed to be 0.2-0.6 m/S, and the acceleration to be 0.002-0.006 m/S2。
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