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High-strength easy-cutting processing gray pig iron

A free-cutting, gray cast iron technology, applied in the field of new high-strength and easy-to-machine gray cast iron materials, to achieve the effect of convenient operation and simple production process

Active Publication Date: 2012-04-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the processing problem of existing high-strength gray cast iron, and to provide a kind of gray cast iron with high strength and easy cutting

Method used

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  • High-strength easy-cutting processing gray pig iron
  • High-strength easy-cutting processing gray pig iron
  • High-strength easy-cutting processing gray pig iron

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Embodiment Construction

[0020] Invented alloy structure and properties:

[0021] The high-strength, easy-to-cut gray cast iron of the present invention is smelted in an intermediate-frequency induction furnace. The main raw materials are scrap steel and a recarburizer. The temperature of the molten iron is higher than 1500 degrees Celsius. Compared with the high-strength gray cast iron with Mo added, the high-strength easy-cutting gray cast iron of the present invention eliminates expensive Mo elements, optimizes N, Si, Mn and other elements, increases the content of chemical elements V, and makes the pearlite form cross distribution, The size is reduced, the distance between the sheets is reduced, especially the graphite is fine, curved, the sharp corners become blunt, and the distribution is uniform, such as Figure 1-4 As shown; while improving the strength of gray cast iron, improve its processing performance, because the uniform and dispersed distribution of fine, curved graphite is easy to defo...

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Abstract

The invention relates to a novel high-strength easy-cutting processing gray pig iron which is suitable for producing a high-strength powered engine cylinder body. The gray pig iron comprises the following components in percentage by weight: 2.90-3.50 percent of C, 1.80-2.20 percent of Si, 0.30-0.60 percent of Mn, 0.01-0.05 percent of P, 0.03-0.15 percent of S, 0.15-0.50 percent of Cr, 0.20-0.80 percent of Cu, 0.01-0.10 percent of Sn, 0.110-0.190 percent of V and 0.020-0.070 percent of N. The invention realizes the purposes that the tensile strength exceeds that of a Mo-containing high-strength gray pig iron and the cutting property is superior to the Mo-containing high-strength gray pig iron, and effectively solves the key problem that the strength and the processing property are a pair of confliction in the field of metal materials.

Description

Technical field: [0001] The invention relates to a novel high-strength and easy-to-process gray cast iron material, which is suitable for producing high-strength and high-horsepower engine cylinder blocks, especially the production of high-strength gray cast iron parts that require high strength and good cutting performance. Background technique: [0002] High-strength gray cast iron is mainly used for castings such as engine cylinder blocks and cylinder heads. In 1995, the output of engine iron castings of 13 major automobile companies in the world was 4.599 million tons, of which the weight of cylinder blocks and cylinder head castings was 2.652 million tons. It accounts for 57.7% of the weight of engine castings. In my country, almost all the castings of truck diesel engine cylinder blocks and cylinder heads are made of high-strength gray cast iron, and only high-horsepower engine cylinder heads are individually made of vermicular iron. However, the engine cylinder block...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/06
Inventor 姜启川王金国逄伟
Owner JILIN UNIV
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