Dot graphite cast iron and its production method

Abstract

A dot-graphite cast iron contanis C (2.2-3.6 wt.%), Si (1.0-1.8), Mn (0.4-1.2) and Fe (rest). It is prepared through smelting iron in copola furnace while controlling the contents of C, Si and Mn, adding modifier (SiFe, RE-SiFe, SiCa, Or AlBiSb alloy) to casting lalde, laying aside for 3-5 min, skimming, and casting at 1350 deg.C. The performance of its casting is higher than that of nodular graphite cast iron.

Description

technical field [0001] The invention relates to an iron-carbon alloy, in particular to point-shaped graphite cast iron and a production method thereof. Background technique [0002] At present, there are no data reports on point-shaped graphite cast iron at home and abroad. Its closest relative is ductile iron. In ductile cast iron, the carbon in the cast iron exists in the form of spherical graphite mainly through the magnesium-containing nodularizer, which greatly reduces the harm caused by flake graphite. Although nodular cast iron has been widely used since its inception, there are still the following shortcomings: one is to use expensive magnesium or magnesium alloy as nodularizer; the other is to use high-quality iron with high value, and strictly limit the content of sulfur and phosphorus; The third is that during the pre-furnace treatment, due to the intense combustion of magnesium, it will cause great harm to the environment; the fourth is that the central spheroi...

AI Technical Summary

Problems solved by technology

Although nodular cast iron has been widely used since its inception, there are still the following shortcomings: one is to use expensive magnesium or magnesium alloy as nodularizer; the other is to use high-quality iron with high value, and strictly limit the content of sulfur and phosphorus; The third is that during the pre-furnace treatment, due to the intense combustion of magnesium, it will cause great harm to the environment; the fourth is that the central spheroidization of large-section castings is easy to decline, which reduces the stability of the material structure and increases the overall cost.