Hard stainless steel pump valve casting and preparation method thereof
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A stainless steel pump and stainless steel technology is applied in the field of hard stainless steel pump and valve castings and their preparation. Effect
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 of this embodiment is: Cr: 13.0%, Si: 0.5%, Mn: 0.5%, Ni: 5.5%, Ti: 0.4%, Cu: 0.4%, W: 0.4%, N≤0.5%, S<0.03%, P<0.03%, C: 0.25%, refining agent 0.3%, the rest 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 75wt.% AlCa master alloy powder 5, RE content 10wt.% AlRE master alloy powder 3 , stearic acid 1, the preparation method of this refining agent is: first AlCa master alloy powder, AlRE master alloy powder are dropped into ball mill jar together, after stirring and mixing, add dehydrated alcohol, stearic acid, graphene, in airtight condition Mix for 2 hours by ball milling, add honeycomb ceramic powder after ball milling, and continue grinding for 20 minutes. After grinding, take out the mixed material, dry at room temperature, and completely remo...
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Abstract
The invention discloses a hard stainless steel pump valve casting. According to the hard stainless steel pump valve casting, on the basis that low-carbon steel is good in toughness and plasticity, the use amount of elements such as Ti, Cu and W is increased properly, and thus great plasticity, toughness, abrasion resistance and corrosion resistance can be maintained while higher hardness of a stainless steel casting material is achieved; 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 is easier to disperse 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 the quality of the casting is improved; the stainless steel subjected to heat treatment for multiple times is stable, the prepared casting is durable and resistant to abrasion, 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 hard 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, liquid metal and radioactive fluids, etc., the ...
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