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CN-122013027-A - Alloy, and preparation method and application thereof

CN122013027ACN 122013027 ACN122013027 ACN 122013027ACN-122013027-A

Abstract

The application belongs to the field of metallurgy, and provides an alloy and a preparation method and application thereof. The method comprises the steps of carrying out first tapping treatment on molten steel to divide the molten steel into first molten steel and second molten steel, wherein the relation between the tapping quantity Q 1 of the first tapping treatment and the total quantity Q of the molten steel is Q 1 = (0.2-0.3) Q, carrying out second tapping treatment on the second molten steel, adding a first alloy and a second alloy into the second molten steel in the second tapping treatment process to obtain third molten steel, wherein the first alloy comprises vanadium element and niobium element, the second alloy comprises nitrogen element, and carrying out refining, continuous casting treatment, heating treatment and rolling treatment on mixed molten steel formed by the first molten steel and the third molten steel in sequence to obtain the alloy. The alloy prepared by the method provided by the embodiment of the application has better strength, toughness and welding performance.

Inventors

  • WANG XIAOYAN
  • LI XING
  • WANG ZHIHENG
  • YANG WENBO
  • SHU GUOBING

Assignees

  • 宝武集团鄂城钢铁有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (6)

  1. 1. A method of preparing an alloy comprising the steps of: Carrying out first tapping treatment on molten steel to separate the molten steel into first molten steel and second molten steel, wherein the relation between the tapping quantity Q 1 of the first tapping treatment and the total quantity Q of the molten steel is Q 1 = (0.2-0.3) Q; Carrying out second tapping treatment on the second molten steel, and adding a first alloy and a second alloy into the second molten steel in the second tapping treatment process to obtain third molten steel, wherein the first alloy comprises vanadium element and niobium element, and the second alloy comprises nitrogen element; refining, continuous casting, heating and rolling the mixed molten steel formed by the first molten steel and the third molten steel in sequence to obtain the alloy, wherein the rolling comprises rough rolling, middle rolling and finish rolling in sequence to obtain a hot steel bar with the diameter of 6-12 mm, and after the rolling, cooling the hot steel bar before obtaining the alloy, and controlling the final cooling temperature to be 920-940 ℃; The alloy comprises 0.26-0.28% of carbon element, 0.60-0.80% of silicon element, 1.50-1.60% of manganese element, less than or equal to 0.035% of sulfur element, less than or equal to 0.035% of phosphorus element, 0.14-0.18% of sum of niobium element and vanadium element, 5.5-7% of ratio of vanadium element and nitrogen element, 0.022-0.026% of nitrogen element and the balance of iron element and unavoidable impurities, wherein the alloy is steel bar with the diameter less than or equal to 12mm.
  2. 2. The preparation method according to claim 1, wherein the mass ratio of the niobium element to the vanadium element is 1:6-10.
  3. 3. The method according to claim 1, wherein the steel bar has a yield strength of not less than 650MPa, a tensile strength of not less than 820MPa, a strength-to-flex ratio of not less than 1.25, and a maximum total force elongation of not less than 9.0.
  4. 4. The method of manufacturing according to claim 1, wherein the refining comprises: Nitrogen is blown into the mixed molten steel, the time of the nitrogen blowing is determined according to the content of nitrogen in the mixed molten steel, wherein the mass fraction of the nitrogen is between 0.024% and 0.026%, and the time of the nitrogen blowing is less than or equal to 10min; the mass fraction of nitrogen element is between 0.022 and 0.024 percent, and the nitrogen blowing time is 10min-15min; The mass fraction of the nitrogen element is less than 0.022, and the nitrogen blowing time is 15-20 min.
  5. 5. The method according to claim 1, wherein the temperature of the heat treatment is 1200 ℃ to 1300 ℃ for a time of not less than 90min.
  6. 6. Use of an alloy prepared by the preparation method of any one of claims 1 to 5 in the field of construction.

Description

Alloy, and preparation method and application thereof Technical Field The application relates to the technical field of metallurgy, in particular to an alloy and a preparation method and application thereof. Background In recent years, with the continuous improvement of the safety and energy-saving design requirements of building structures, high-strength hot rolled ribbed steel bars with the grade of 600MPa and above are increasingly widely applied to high-rise and large-span building structures, and the diameter specification of the hot rolled ribbed steel bars usually covers phi 12mm to phi 32mm. Under the comprehensive consideration of alloy element strengthening theory and alloy cost, a niobium vanadium nitrogen composite strengthening process is generally adopted at present to produce the steel bar, and proper amount of alloy elements such as vanadium, niobium and the like are added to ensure that the yield strength meets the standard requirement. However, in production practice, the small-sized high-strength steel bars with the phi of 12mm have obvious performance abnormality. The method is characterized in that on one hand, the yield strength of part of the products is higher, so that the yield strength is lower than 1.25 and the anti-seismic performance requirement cannot be met, and on the other hand, the yield strength is insufficient and the risk of being lower than the standard limit value exists, so that the mechanical performance of the products cannot fully meet the technical index of the anti-seismic steel bar. It should be noted that the foregoing is not necessarily prior art, and is not intended to limit the scope of the present application. Disclosure of Invention The embodiment of the application provides an alloy, a preparation method and application thereof, and aims to solve or alleviate one or more of the technical problems. In a first aspect of an embodiment of the present application, a method for preparing an alloy is provided. The method comprises the following steps: Carrying out first tapping treatment on molten steel to separate the molten steel into first molten steel and second molten steel, wherein the relation between the tapping quantity Q 1 of the first tapping treatment and the total quantity Q of the molten steel is Q 1 = (0.2-0.3) Q; and carrying out second tapping treatment on the second molten steel, adding a first alloy and a second alloy into the second molten steel in the second tapping treatment process to obtain third molten steel, wherein the first alloy comprises vanadium elements and niobium elements, the second alloy comprises nitrogen elements, the mixed molten steel formed by the first molten steel and the third molten steel is sequentially subjected to refining, continuous casting treatment, heating treatment and rolling treatment to obtain the alloy, the rolling treatment comprises sequentially carrying out rough rolling, middle rolling and finish rolling to obtain a hot-state steel bar with the diameter of 6mm-12mm, cooling the hot-state steel bar after the rolling treatment is carried out, controlling the final cooling temperature to be 920 ℃ to 940 ℃, the alloy comprises carbon elements with the mass fraction of 0.26% -0.28%, silicon elements with the mass fraction of 0.60% -0.80%, manganese elements with the mass fraction of 1.50% -1.60%, sulfur elements with the mass fraction of 0.035% or less, the balance being nitrogen elements with the mass fraction of 0.035% -0.026% and the mass fraction of nitrogen elements with the mass fraction of 0.022% -0.02 ℃ and the balance being nitrogen elements with the mass fraction of 0.5% and the mass fraction of nitrogen elements being 0.020.020.5% and the steel bar with the diameter of 0.022% or less. According to the method provided by the embodiment of the application, a part of molten steel (first molten steel) is first obtained in the first tapping treatment process, and the other part of molten steel (second molten steel) is carried out in the second tapping treatment process, and meanwhile, the first alloy and the second alloy containing elements such as vanadium, niobium, nitrogen and the like are added, and the addition is completed before the third molten steel is obtained, so that the components of the obtained alloy can be promoted to meet the design requirements. And refining, continuously casting, heating and rolling the mixed molten steel formed by the first molten steel and the third molten steel to obtain the alloy with better strength, toughness and welding performance. Specifically, the first molten steel formed by the first tapping is a ladle liquid level foundation, and then in the second tapping process, along with the addition of alloy elements, not only can the oxidation burning loss and slag loss of the mixed molten steel formed by the first molten steel and the third molten steel be reduced, but also the elements such as vanadium, niobium, nitrogen and the like can be fully mixed and uni