High-grade grey cast iron casting method

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 ...

AI Technical Summary

Problems solved by technology

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 porosity will occur after adding these ingredients.

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