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CN-121992289-A - Ferritic stainless steel, use thereof, heat exchanger component and heat exchanger

CN121992289ACN 121992289 ACN121992289 ACN 121992289ACN-121992289-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 ：0<C≤0.025%,0<Si≤0.8%,0<Mn≤1.0%,0<P≤0.04%,0<S≤0.03%,17%≤Cr≤20%,1.5%≤Mo≤2.5%,0.5%≤Nb≤0.8%,0<Ti≤0.02%, by mass percent, and the balance of Fe and unavoidable impurities. The ferrite stainless steel provided by the invention has high heat conductivity and low expansion coefficient, and has excellent sensitization intergranular corrosion resistance and chloride ion corrosion resistance, so that the ferrite stainless steel has excellent heat conductivity and fatigue resistance, the production cost of the ferrite stainless steel is low, the ferrite stainless steel is especially applied to a heat exchanger, the heat exchanger has excellent heat conductivity and long service life, and the ferrite stainless steel has excellent market application prospect, and especially has great potential advantages in the application aspect of the 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≤0.8%,0<Mn≤1.0%,0<P≤0.04%,0<S≤0.03%,17%≤Cr≤20%,1.5%≤Mo≤2.5%,0.5%≤Nb≤0.8%,0<Ti≤0.02%, The balance Fe and unavoidable impurities.
  2. 2. The ferritic stainless steel according to claim 1, wherein 0.05% or less Mn or less than 0.2%.
  3. 3. The ferritic stainless steel according to claim 1, wherein 2% Mo is 2.5%.
  4. 4. The ferritic stainless steel according to claim 1, wherein 0.6% nb≤0.7%.
  5. 5. The ferritic stainless steel according to claim 1, wherein 0.005% or less Ti or less than 0.015%.
  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≤0.8%,0.05≤Mn≤0.2%,0<P≤0.04%,0<S≤0.03%,17%≤Cr≤20%,2%≤Mo≤2.5%,0.6%≤Nb≤0.7%,0.005%≤Ti≤0.015%, 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 23.0W/(m-K) -30.5W/(m-K) in the range of 200-1000 ℃; and/or, in the range of 200 ℃ to 1000 ℃, the ferritic stainless steel has a thermal expansion coefficient of 11.5× (10-6/° C) -14.5× (10-6/° C).
  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 Heat exchangers and the like are typically manufactured from stainless steel materials, and in heat exchanger products and equipment, chloride-containing liquids or tap water are typically used as cooling media for cooling purposes. However, extremely high corrosive environments generated by chlorides and chloride ions in tap water have a certain corrosive action on stainless steel materials, and inter-crystal corrosion in particular constitutes a major problem in heat exchangers using a liquid containing chlorides as a cooling liquid, and therefore, there is a higher demand for corrosion resistance of stainless steel materials used in heat exchangers. 316L is a stainless steel material mark, and mainly contains Cr, ni, mo and other elements. The 316L stainless steel is of molybdenum-containing stainless steel type, the material has good appearance glossiness and good corrosion resistance, and the 316L stainless steel is widely used in the chemical industry, the clock industry and the 3C electronic industry, and is also commonly used in the heat exchanger preparation industry. Although 316L has a certain corrosion resistance, it is easily sensitized, if a severe coolant is used, the corrosion resistance is still to be improved, and at the same time, 316L is used as a material for heat exchangers, which has insufficient thermal conductivity and fatigue resistance, and is costly. Therefore, in order to satisfy the material properties in the heat exchanger field, it is very important to develop a material excellent in corrosion resistance, thermal conductivity and fatigue resistance. 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≤0.8%,0<Mn≤1.0%,0<P≤0.04%,0<S≤0.03%,17%≤Cr≤20%,1.5%≤Mo≤2.5%,0.5%≤Nb≤0.8%,0<Ti≤0.02%, The balance Fe and unavoidable impurities. According to the ferritic stainless steel disclosed by the invention, nb element and C form stable carbide NbC, grains can be refined, the strength and intergranular corrosion resistance of the material are improved, and the Nb element and Cr element synergistically improve the pitting corrosion resistance of the material, specifically, the precipitation of a Cr-rich second phase can be effectively reduced by controlling the content of the Cr element within the range, so that the corrosion resistance, the strength and the toughness of the material are improved, and the content of Nb element is controlled within the range, so that the pitting corrosion resistance, the chloride ion corrosion resistance and the sensitization intergranular corrosion resistance of the material can be obviously improved in cooperation with the Cr element. The inventors found that by adding the niobium element and the titanium element and controlling the respective components of the stainless steel material within the above-described ranges, in particular, the manganese element, the molybdenum element, the niobium element, and the titanium element within the above-described ranges, the heat conductivity of the stainless steel material can be remarkably improved, the heat expansion coefficient of the material can be reduced, and the heat conductivity and fatigue resistance of the material can be improved. Therefore, the ferritic stainless steel has excellent heat conduction performance, corrosion resistance and fatigue resistance, and the cost of the ferritic stainless steel is low. The above ferritic stainless steel according to the present invention preferably has Mn of 0.05% or less and Mn of 0.2% or less. The above ferritic stainless steel according to the present invention preferably contains 2% or less of Mo or less than 2.5%. The above ferritic stainless steel according to the present invention preferably contains 0.6% or more and 0.7% or less of Nb. The above ferritic stainless steel according to the present invention preferably contains 0.005% or less of Ti or less of 0.015%. The ferritic stainless steel according to the present invention preferably comprises the following components in mass percent: 0<C≤0.025%,0<Si≤0.8%,0.05≤Mn≤0.2%,0<P≤0.04%,0<S≤0.03%,17%≤Cr≤20%,2%≤Mo≤2.5%,0.6%≤Nb≤0.7%,0.005%≤Ti≤0.015%, The balance Fe and unavoidable impurities. According to the present invention, the above ferritic stainless steel has a thermal conductivity of 23.0W/(m·k) to 30.5W/(m·k)