Phosphorus-containing mixed iron powder for automobiles and preparation method thereof
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A technology for mixing iron and automobiles, applied in the field of powder metallurgy, can solve the problems of different proportions of alloying elements, high cost of alloying elements, easy to produce segregation and other problems, and achieve the effect of reducing bulge or agglomeration, improving mechanical properties, and stable dimensional tolerances
Active Publication Date: 2018-06-15
ANGANG (ANSHAN) METALLURGY POWDER MATERIAL CO LTD
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[0003] At present, in order to achieve the above technical indicators, graphite, copper powder, nickel powder, etc. are often added to iron and steel powder. Their existence: the cost of alloying elements is high due to the variety of additions; , it will be more prone to segregation; the pressed density is low and the signal transmission performance is good, and the hardness is also low
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Embodiment 1
[0021] A mixed iron powder containing phosphorus for automobiles, the chemical composition is by weight percentage: C: 0.008%; Si: 0.028%; Mn: 0.15%; P: 0.55%; S: 0.020%, the rest Fe and unavoidable impurities.
[0022] The preparation method of the above-mentioned phosphorus-containing mixed iron powder for automobiles comprises the following steps:
[0023] (1) Preparation of compressive water atomized pure iron powder
[0024] The preparation of highly compressible water atomized pure iron powder includes: smelting, atomization, reduction, and annealing processes, described as follows:
[0025] A. Smelting: With scrap steel and pig iron as the main raw materials, molten steel with uniform and stable composition and less impurities can be obtained by smelting in an electric furnace. The tapping temperature: 1620-1800°C. Si≤0.50%, Mn≤0.50%, P≤0.050%, S≤0.050%, the balance is Fe;
[0034] A mixed iron powder containing phosphorus for automobiles, the chemical composition is by weight percentage: C: 0.013%; Si: 0.029%; Mn: 0.13%; P: 0.42%; S: 0.013%, the rest Fe and unavoidable impurities.
[0035] The preparation method of the above-mentioned phosphorus-containing mixed iron powder for automobiles comprises the following steps:
[0036] (1) Preparation of compressive water atomized pure iron powder
[0037] The preparation of highly compressible water atomized pure iron powder includes: smelting, atomization, reduction, and annealing processes, described as follows:
[0038] A. Smelting: With scrap steel and pig iron as the main raw materials, molten steel with uniform and stable composition and less impurities can be obtained by smelting in an electric furnace. The tapping temperature: 1620-1800°C. Si≤0.50%, Mn≤0.50%, P≤0.050%, S≤0.050%, the balance is Fe;
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Abstract
The invention relates to phosphorus-containing mixed iron powder for automobiles. The phosphorus-containing mixed iron powder is prepared from the following chemical components in percentage by weight: 0.001 percent to 0.2 percent of C, 0 percent to 0.50 percent of Si, 0.1 percent to 1.0 percent of Mn, 0.1 percent to 1.0 percent of P, 0 percent to 0.050 percent of S and the balance of Fe and inevitable impurities, wherein the loose packed density is 3.10g/cm<3> to 3.20g/cm<3>, the compressibility under the pressure of 600MPa is more than 7.05g/cm<3>, and the flowability is 32.0s/50g to 33.8s/50g. The phosphorus-containing mixed iron powder is prepared by performing diffusion bonding on water atomized pure iron powder with high compressibility and ferrophosphorus powder; the water atomizedpure iron powder is used as basic powder, the ferrophosphorus powder is added into the water atomized pure iron powder according to requirements of the components, and then the ferrophosphorus powderand the water atomized pure iron powder are uniformly mixed and then are diffused through a reducing furnace so as to obtain powder containing ferrophosphorus powder; the powder containing ferrophosphorus powder is added into 0.1 percent by weight to 1.0 percent by weight of lubricant, and then mixing is carried out for 20 minutes to 40 minutes to obtain a finished product. The phosphorus-containing mixed iron powder disclosed by the invention has the advantages that the using of alloy auxiliary categories is less so that the using cost of alloys is reduced, segregation on alloy element components is not produced in transportation and mixing processes, the stability of dimensional tolerance can be maintained in a sintering process of the product, and an iron-based alloy product having a uniform microscopic structure is conveniently obtained.
Description
technical field [0001] The invention relates to the field of powder metallurgy, in particular to a phosphorus-containing mixed iron powder for automobiles and a preparation method thereof. Background technique [0002] There are some powder metallurgy parts in the automotive product parts, which require good magnetic induction performance during use, such as: camshaft signal disc, ABS gear ring, so the product parts are required to have low carbon, high density and good signal transmission performance and elongation. [0003] At present, in order to achieve the above technical indicators, graphite, copper powder, nickel powder, etc. are often added to iron and steel powder. Their existence: the cost of alloying elements is high due to the variety of additions; , it will be more prone to segregation; the pressed density is low and the signal transmission performance is good, and the hardness is also low. Contents of the invention [0004] The technical problem to be solve...
Claims
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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C22C33/02
CPCC22C33/0271B22F1/145B22F1/10
Inventor 卜福昌纪向军李江王洋修凤玲高扬
Owner ANGANG (ANSHAN) METALLURGY POWDER MATERIAL CO LTD
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