D-type graphite cast iron containing lead, arsenic and tin

A graphite cast iron, D-type technology, applied in the field of D-type graphite cast iron, can solve the problems of harmful cast iron performance, and achieve the effects of low cost, high strength performance, and simple production process

Inactive Publication Date: 2007-01-17
FUZHOU UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The invention solves the defect that lead, arsenic, and tin elements have harmful effects on the performance of cast iron in the prior art, and provides a D-type graphite cast iron containing lead, arsenic, and tin that can improve the performance of D-type graphite cast iron

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  • D-type graphite cast iron containing lead, arsenic and tin

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Embodiment Construction

[0014] On the basis of studying the dissimilation behavior of lead, arsenic and tin in cast iron, the present invention uses the local pig iron in Fujian Province—Longyan pig iron as the main raw material to smelt molten iron. Adding alloy elements, the chemical composition of the present invention is: 2.9-3.5% C; 2.4-3.6% Si; 0.7-0.9% Mn; ≤0.095% P; ≤0.04% S; 0.003-0.008% Pb; ; 0.08-0.4% Sn; 0.1-0.3% Al; 0.07-0.10% Ti; the rest is Fe. The preparation test of D-type graphite cast iron was carried out in the metal mold. The test uses L 9 (3 4 ) Orthogonal design test method to formulate a plan for research, the four factors are: titanium addition, Si / C, inoculant addition and aluminum addition. Fix the carbon equivalent at the hypoeutectic or eutectic level, change Si / C, and use Longyan pig iron with a powerful inoculant—barium-containing ferrosilicon for effective inoculation, and use the compounding effect of added alloy elements aluminum and titanium , very successfully ...

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Abstract

The present invention is one kind of type-D cast iron containing Pb, As and Sn and with raised performance. The present invention is superior to available technology, in which Pb, As and Sn are harmful to the performance of cast iron. The type-D cast iron of the present invention contains: C 3.9-4.5 (in weight portions, the same below), Si 1.2-1.6, Mn 0.6-0.95, P not more than 0.07, S not more than 0.04, Pb 0.005-0.009, As 0.03-0.08, Sn 0.1-0.4, Al 0.01-0.02 and Ti 0.04-0.09, except Fe. The type-D cast iron of the present invention as one new low cost engineering material has very high strength performance and excellent antioxidant performance, and may be used in high strength parts, such as crank shaft and cam shaft in refrigerator and compressor, heat resisting parts, such as glass mold, and heat resisting and wear resisting casting, such as roller.

Description

Technical field: [0001] The invention relates to a D-type graphite cast iron containing lead, arsenic and tin. Background technique: [0002] Lead, arsenic, and tin are the main impurity elements in Longyan pig iron, the main local pig iron in Fujian Province. In the past, these impurity elements were considered to be very harmful. However, the study found that a common effect of these elements is to increase the supercooling tendency of graphite precipitation in cast iron, and form supercooled D-type graphite in cast iron. The micro-spectrum analysis shows that in the A-type graphite region, lead, arsenic, and tin are mainly distributed on the substrate; while in the D-type graphite region, lead, arsenic, and tin are mainly concentrated on the graphite. In this way, using Longyan pig iron to produce D-type graphite cast iron can take advantage of the dissimilation behavior of lead, arsenic, and tin in cast iron to reduce the damage of these impurity elements to the matrix....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/04
Inventor 卢月美李树江林小瑛陈绍春廖锦明
Owner FUZHOU UNIV
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