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CN-121992290-A - Ferritic stainless steel, use thereof, heat exchanger component and heat exchanger

CN121992290ACN 121992290 ACN121992290 ACN 121992290ACN-121992290-A

Abstract

The invention provides a ferritic stainless steel, application thereof, a heat exchanger component and a heat exchanger. The ferrite stainless steel comprises the following components in percentage by mass: 0< C less than or equal to 0.025%,0< Si less than or equal to 1.0%,0< Mn less than or equal to 1.0%,0<P less than or equal to 0.04%,0<S less than or equal to 0.03%,21% less than or equal to 24% Cr, 1.5% less than or equal to 2.5% Mo, 0< N less than or equal to 0.025%,0.15% less than or equal to Nb less than or equal to 0.25%,0.15% less than or equal to 0.25% Ti, and the balance Fe and unavoidable impurities. The ferritic stainless steel provided by the invention has high heat conductivity and low expansion coefficient, and has excellent intergranular corrosion resistance, so that the ferritic stainless steel has excellent heat conductivity and fatigue resistance, and particularly has excellent heat conductivity and long service life when being applied to a heat exchanger.

Inventors

  • LIU TIAN
  • YANG YONG
  • XIONG XIAOJUN

Assignees

  • 芜湖美的厨卫电器制造有限公司

Dates

Publication Date
20260508
Application Date
20241104

Claims (10)

  1. 1. The ferrite stainless steel is characterized by comprising the following components in percentage by mass: 0<C≤0.025%,0<Si≤1.0%,0<Mn≤1.0%,0<P≤0.04%,0<S≤0.03%,21%≤Cr≤24%,1.5%≤Mo≤2.5%,0<N≤0.025%,0.15%≤Nb≤0.25%,0.15%≤Ti≤0.25%, The balance Fe and unavoidable impurities.
  2. 2. The ferritic stainless steel according to claim 1, wherein 0.4% or less Mn or less than 0.8%.
  3. 3. The ferritic stainless steel according to claim 1, wherein 2% Mo 2.3%.
  4. 4. The ferritic stainless steel according to claim 1, wherein 0.18% nb≤0.22%.
  5. 5. The ferritic stainless steel according to claim 1, wherein 0.18% or less Ti or less than 0.22% or less.
  6. 6. Ferritic stainless steel according to any of claims 1-5, characterized in that it comprises the following components in mass percent: 0<C≤0.025%,0<Si≤1.0%,0.4%≤Mn≤0.8%,0<P≤0.04%,0<S≤0.03%,21%≤Cr≤24%,2%≤Mo≤2.3%,0<N≤0.025%,0.18%≤Nb≤0.22%,0.18%≤Ti≤0.22%, The balance Fe and unavoidable impurities.
  7. 7. The ferritic stainless steel according to any of claims 1-5, characterized in that the thermal conductivity of the ferritic stainless steel is 21.4W/(m-K) -29.8W/(m-K) in the range of 200-1000 ℃; And/or, the ferritic stainless steel has a thermal expansion coefficient of 11.1× (10 -6 /℃)-15.5×(10^ -6 /°c) in the range of 200 ℃ to 1000 ℃.
  8. 8. Use of a ferritic stainless steel according to any of claims 1-7 in heat exchangers, electric heating pipes.
  9. 9. A heat exchanger component, characterized in that it is produced using a ferritic stainless steel according to any one of claims 1-7.
  10. 10. A heat exchanger comprising the heat exchanger component of claim 9.

Description

Ferritic stainless steel, use thereof, heat exchanger component and heat exchanger Technical Field The invention relates to the technical field of stainless steel materials, in particular to ferrite stainless steel and application thereof, a heat exchanger component and a heat exchanger. Background 2205 Stainless steel material is applied in the fields of pressure vessels, high-pressure storage tanks, high-pressure pipelines, heat exchangers and the like. When the heat exchanger is applied to a heat exchanger, although the corrosion resistance of the 2205 stainless steel material can meet the heat exchanger requirement, the heat conduction performance and the fatigue resistance of the 2205 stainless steel material are poor, for example, a heat exchanger tube prepared from the 2205 stainless steel material is easy to crack due to fatigue, so that the working condition of the heat exchanger cannot be completely met. In view of the above, on the basis of the corrosion resistance of the 2205 stainless steel material, the improvement of the heat conductivity and fatigue resistance of the material to meet the working condition requirement of the heat exchanger has very important significance. Disclosure of Invention The present invention aims to solve at least to some extent one of the technical problems in the prior art. To this end, an object of the invention is to propose a ferritic stainless steel and its use, a heat exchanger component and a heat exchanger. In a first aspect of the invention, the invention provides a ferritic stainless steel. The ferrite stainless steel comprises the following components in percentage by mass: 0<C≤0.025%,0<Si≤1.0%,0<Mn≤1.0%,0<P≤0.04%,0<S≤0.03%,21%≤Cr≤24%,1.5%≤Mo≤2.5%,0<N≤0.025%,0.15%≤Nb≤0.25%,0.15%≤Ti≤0.25%, The balance Fe and unavoidable impurities. According to the ferritic stainless steel, on one hand, nb element and C element form stable carbide NbC, grains are refined, ti element, C element and N element form Ti (C, N), and Nb element and Ti element act synergistically, so that the strength and the intergranular corrosion resistance of the stainless steel material are improved. On the other hand, the components of the stainless steel material are controlled within the ranges, particularly, the manganese element, the molybdenum element, the nitrogen element, the niobium element and the titanium element are controlled within the ranges, and on the basis of ensuring the corrosion resistance of the stainless steel material, the heat conductivity of the stainless steel material can be obviously improved, and the heat expansion coefficient of the material can be reduced, so that the heat conductivity and the fatigue resistance of the material are improved. Therefore, the ferrite stainless steel has excellent heat conduction performance, fatigue resistance and corrosion resistance. The above ferritic stainless steel according to the present invention preferably has Mn of 0.4% or less and Mn of 0.8% or less. The above ferritic stainless steel according to the present invention preferably contains 2% or less of Mo or less than 2.3%. The above ferritic stainless steel according to the present invention preferably contains 0.18% or more and 0.22% or less of Nb. The above ferritic stainless steel according to the present invention preferably contains 0.18% or less and 0.22% or less of Ti. The ferritic stainless steel according to the present invention preferably comprises the following components in mass percent: 0<C≤0.025%,0<Si≤1.0%,0.4%≤Mn≤0.8%,0<P≤0.04%,0<S≤0.03%,21%≤Cr≤24%,2%≤Mo≤2.3%,0<N≤0.025%,0.18%≤Nb≤0.22%,0.18%≤Ti≤0.22%, The balance Fe and unavoidable impurities. According to the present invention, the above ferritic stainless steel has a thermal conductivity of 21.4W/(m·k) -29.8W/(m·k) in the range of 200 ℃ to 1000 ℃; According to the present invention, the above ferritic stainless steel has a thermal expansion coefficient of 11.1× (10 -6/℃)-15.5×(10^-6/° C) in the range of 200 ℃ to 1000 ℃. In a second aspect of the invention, the invention provides application of the ferrite stainless steel in heat exchangers and electric heating pipes. In a third aspect of the invention, a heat exchanger component is provided. The heat exchanger component is prepared from the ferritic stainless steel. Thus, the heat exchanger component has excellent corrosion resistance, a higher thermal conductivity and a lower thermal expansion coefficient. In a fourth aspect of the invention, the invention provides a heat exchanger. The heat exchanger comprises the heat exchanger component. Thus, the heat exchanger has good heat conducting performance and long service life. Drawings In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and