High-grade grey cast iron casting method

A gray cast iron, high-grade technology, applied in the field of gray cast iron casting, can solve the problems of shrinkage cavity, high cost pressure, shrinkage porosity, etc., and achieve the effect of improving strength and hardness

Inactive Publication Date: 2014-02-12
GUANGXI YUCHAI MASCH CO LTD
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Problems solved by technology

However, the addition of these precious metals will bring very high cost pressure to the manufacturer on the one han

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  • High-grade grey cast iron casting method

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[0017] A specific embodiment of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments. It should be understood that the "up", "down", "left", "right", "front" and "reverse" mentioned in the following embodiments of the present invention are all based on the directions shown in each figure. These words used to limit the direction are only for convenience of description, and do not represent limitations to the specific technical solutions of the present invention.

[0018] The high-grade gray cast iron casting method of the present invention improves the strength and hardness of the casting by reducing the addition amount of the conventional alloy manganese, sulfur, copper, and tin in the production of gray iron casting, without adding the above-mentioned precious metals, reducing the production cost while avoiding ...

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Abstract

The invention discloses a high-grade grey cast iron casting method. The method specifically comprises the following steps: firstly, a rear-furnace charging step; secondly, a molten iron smelting step, wherein added furnace charge is molten into molten iron, molten iron high-temperature refining is carried out after components of the molten iron are adjusted, and the adjusted molten iron components include: 2.8%-3.3% of carbon, 1.6%-2.1% of silicon, 0.2%-0.4% of manganese, 0.02%-0.07% of phosphor, 0.02%-0.06% of sulfur, 0.2%-0.4% of chromium, 0.3%-0.6% of copper, and 0.04%-0.1% of tin; thirdly, a molten iron inoculation treatment step; finally, a casting piece casting step. According to the high-grade grey cast iron casting method disclosed by the invention, the strength and hardness of a casting piece are improved by lowering addition of normal alloys manganese, sulfur, copper and tin in the gray iron casting production; the noble metals are not added, so that the casting piece product is prevented from generating the defects such as cavity shrinkage and porosity shrinkage while the production cost is lowered.

Description

technical field [0001] The invention relates to the field of gray cast iron casting, in particular to a high-grade gray cast iron casting method. Background technique [0002] With the development of casting technology in the automobile, machine tool and construction machinery industries, casting castings with high strength and stable reliability has become the development trend of the current foundry industry. However, how to obtain more stable and reliable high-grade gray cast iron is a way for many foundry enterprises to explore. [0003] At present, some foundry industries increase the strength of gray cast iron by adding precious metals such as molybdenum, niobium and nickel to molten iron smelting, which has become the mainstream of current foundry production. However, the addition of these precious metals will bring very high cost pressure to the manufacturer on the one hand, and on the other hand, defects such as shrinkage cavities and shrinkage porosity will occur ...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08
Inventor 白飞黄进达梁春传张永松
Owner GUANGXI YUCHAI MASCH CO LTD
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