High-hardness stainless steel pump valve casting resistant to high-temperature oxidization and preparation method thereof
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A high-temperature oxidation resistant, stainless steel pump technology, applied in the field of stainless steel castings, can solve the problems of uneven performance and high requirements of pump valve alloy steel, and achieve the effect of improving purity, balancing mechanical properties, and good thermal stability.
Inactive Publication Date: 2016-03-23
TONGLING JINGWEI FLUID SCI & TECH
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[0003] Since stainless steel pumps and valves are exposed to a variety of media, such as water, steam, oil, gas, mud, various corrosive media, liquid metal and radioactive fluids, etc., the performance requirements for pump and valve materials are relatively high. At present, the properties of pump and valve alloy steel on the market are uneven, which is far from meeting the production demand. It is urgent to start from the process and formula to obtain more high-quality and efficient stainless steel materials.
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[0012] The weight percent of each component in the stainless steel casting in this example is: Cr: 15.0%, Ni: 8.0%, Mn: 1.5%, Al: 2.5%, Si: 0.8%, W: 0.5%, Nb: 0.4%, C : 0.6%, B: 0.5%, N: 0.5%, S<0.03%, P<0.03%, refining agent 0.2%, the balance is Fe and unavoidable impurities.
[0013] Wherein the refining agent is made of the following raw materials by weight percentage: honeycomb ceramic powder 5, graphene 0.1, absolute ethanol 10, Ca content of 75wt.% Al-Ca master alloy powder 5, RE content of 10wt.% Al-RE Master alloy powder 3, stearic acid 1, the preparation method of this refining agent is: first put Al-Ca master alloy powder and Al-RE master alloy powder into the ball mill pot, stir and mix evenly, add absolute ethanol, stearin Acid and graphene were ball milled and mixed for 2.5 hours under airtight conditions. After the ball milling, honeycomb ceramic powder was added, and the milling was continued for 25 minutes. After the milling, the mixed material was taken out, d...
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Abstract
The invention discloses a high-hardness stainless steel pump valve casting resistant to high-temperature oxidization. The stainless steel casting is balanced in mechanical property, high in hardness, good in toughness, good in heat fatigue resistance, easy to machine and form, good in oxidization resistance in a high-temperature environment and longer in service life. Due to the fact that nano Ca-RE intermediate phase alloy powder carried by honeycomb ceramic powder and composite graphene refining agents are added in molten liquid, the heat stability is good, the material dispersion is more uniform in molten steel, the impurity removal efficiency and the slag melting efficiency are higher, and the purity degree of the molten steel can be effectively improved, so that alloy structure grains are fine and uniform, and the capacity resistant outside negative factors is high ; the casting subjected to heat treatment for multiple times is stable, and the energy-saving and efficient production effect is achieved.
Description
technical field [0001] The invention relates to the technical field of stainless steel castings, in particular to a high-temperature oxidation-resistant high-hardness stainless steel pump valve casting and a preparation method thereof. Background technique [0002] Stainless steel pumps and valves are widely used in chemical, petrochemical, petroleum, papermaking, mining, electric power, liquefied gas, food, pharmaceutical, water supply and drainage, municipal, mechanical equipment, electronic industry, urban construction and other fields. The pump is a component that transports various media, and the valve is a control component in the pipeline fluid delivery system. It is used to change the passage section and the flow direction of the medium. Functions such as overflow and pressure relief, the two are often used together. [0003] Since stainless steel pumps and valves are exposed to a variety of media, which may be water, steam, oil, gas, mud, various corrosive media, l...
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