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CN-121992291-A - Ferritic stainless steel, use thereof, heat exchanger component and heat exchanger

CN121992291ACN 121992291 ACN121992291 ACN 121992291ACN-121992291-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%,16% less than or equal to 20% Cr, 0< N less than or equal to 0.025%,0.3% less than or equal to 0.8% Cu, and the balance Fe and unavoidable impurities. The ferritic stainless steel provided by the invention has high heat conductivity, low expansion coefficient and good 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%,16%≤Cr≤20%,0<N≤0.025%,0.3%≤Cu≤0.8%, The balance Fe and unavoidable impurities.
  2. 2. The ferritic stainless steel according to claim 1, wherein 0.3% or less Mn or less than 0.7%.
  3. 3. The ferritic stainless steel according to claim 1, wherein 0.01≤n≤0.02%.
  4. 4. The ferritic stainless steel according to claim 1, wherein 0.5% or less Cu or less than 0.7%.
  5. 5. Ferritic stainless steel according to any of claims 1-4, characterized in that it comprises the following components in mass percent: 0<C≤0.025%,0<Si≤1.0%,0.3%≤Mn≤0.7%,0<P≤0.04%,0<S≤0.03%,16%≤Cr≤20%,0.01≤N≤0.02%,0.5%≤Cu≤0.7%, The balance Fe and unavoidable impurities.
  6. 6. The ferritic stainless steel according to any of claims 1-4, characterized in that the thermal conductivity of the ferritic stainless steel is 17.5W/(m-K) -33.5W/(m-K) in the range of 200-1000 ℃.
  7. 7. The ferritic stainless steel according to any of claims 1-4, characterized in that the thermal expansion coefficient of the ferritic stainless steel is 11.8× (10- -6 /℃)-15.5×(10^ -6 /° C) in the range of 200-1000 ℃.
  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 The 304 material is a versatile stainless steel material that is widely used to make devices and parts that require good combination of properties (corrosion and formability). The heat exchanger is selected from materials which not only meet certain corrosion resistance, but also meet certain requirements on heat conductivity and fatigue resistance. The 304 stainless steel material is used as a heat exchanger material, and although the corrosion resistance meets the requirement, the heat conduction performance and the fatigue resistance performance are poor and the requirement of the heat exchanger material cannot be met. The heat exchanger materials commonly used at present also have the problem of higher processing cost. Therefore, how to improve the heat conductivity and fatigue resistance of the 304 stainless steel material and reduce the production cost at the same time has important research value for obtaining the material meeting the requirements of the heat exchanger. 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%,16%≤Cr≤20%,0<N≤0.025%,0.3%≤Cu≤0.8%, The balance Fe and unavoidable impurities. According to the ferritic stainless steel disclosed by the application, on the basis of the 304 material, nickel is removed to obtain the ferritic stainless steel, so that the ferritic stainless steel has higher heat conduction coefficient and lower thermal expansion coefficient, the copper is increased, the content of other elements is changed, particularly the content of manganese and nitrogen is changed, the content of copper is controlled, and the corrosion resistance of the ferritic stainless steel disclosed by the application is also ensured. Therefore, the ferrite stainless steel not only has good corrosion resistance, but also has excellent heat conduction performance and fatigue resistance. The above ferritic stainless steel according to the present invention preferably has Mn of 0.3% or less and Mn of 0.7% or less. The above ferritic stainless steel according to the present invention preferably has 0.01≤N≤0.02%. The above ferritic stainless steel according to the present invention preferably contains 0.5% or less and 0.7% or less of Cu. 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%,0.3%≤Mn≤0.7%,0<P≤0.04%,0<S≤0.03%,16%≤Cr≤20%,0.01≤N≤0.02%,0.5%≤Cu≤0.7%, The balance Fe and unavoidable impurities. According to the present invention, the above ferritic stainless steel has a thermal conductivity of 17.5W/(m·k) -33.5W/(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 11.8× (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 good corrosion resistance, high thermal conductivity and low thermal expansion coefficient. In a fourth aspect of the invention, the invention provides a heat exchanger. The heat exchanger comprises the heat exchanger component. Therefore, the heat exchanger has good heat conducting property, fatigue resistance and longer 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 other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art. FIG. 1 is a balanced phase diagram of a ferritic stainless steel provided by the present invention; FIG. 2 is a graph showing the results of corrosion resistance tests of the stainless steels of example 1 and comparative example 1 of the present invention; FIG. 3 is a graph showing the thermal conductivity of ferritic stainless steels obtain