A kind of ultra-thick large low-temperature ductile iron and its preparation method

Abstract

The invention discloses ultrathick large (wall thickness not less than 200 mm) low-temperature ductile cast iron. The ultrathick large low-temperature ductile cast iron comprises the following components: 4.2-4.4 wt% of CE, 1.9-2.1 wt% of Si, Mn not more than 0.15 wt%, P not more than 0.025 wt%, 0.006-0.012 wt% of S, 0.030-0.045 wt% of Mg, 0.003-0.005 wt% of Sb, 0.02-0.03 wt% of V, and the balance of Fe and impurities carried in the preparation process. The invention further discloses a preparation method of the ultrathick large low-temperature ductile cast iron. The ultrathick large low-temperature ductile cast iron is excellent in heart structure, generates no such special-shaped graphite as fragment graphite, satisfies -20 DEG C impact requirements when satisfying the tensile strength, the yield strength and the ductility, and satisfies the material requirements by high-power development of wind power castings.

Description

technical field [0001] The invention belongs to the technical field of cast iron materials, and in particular relates to an ultra-thick and large low-temperature ductile iron and a preparation method thereof. Background technique [0002] After 2006, my country's wind power installed capacity showed explosive growth. In 2015, China's wind power installed capacity reached a new high. The country (except Taiwan) newly installed 16,740 wind turbines, with a new installed capacity of 30,753MW, a year-on-year increase of 32.6%; a total of 92,981 wind turbines were installed, with a cumulative installed capacity of 145,362MW, a year-on-year increase of 26.8%. In 2015, among the new wind power installed capacity in my country, the market share of 2MW wind turbine assembled units exceeded 1.5MW units for the first time, accounting for 50% of the country's new installed capacity. 1.5MW units and 2MW units still dominated the market, with a market share of 84%. Compared with 2014, th...

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Problems solved by technology

In recent years, with the development of the wind power industry, my country has paid more and more attention to the research of wind power ductile iron, but less research has been done on ultra-thick (wall thickness > 200mm) low-temperature ductile iron suitable for wind power, while the existing ductile iron In the foreign standard EN1563:2011 and the domestic standard GB / T 1348-2009, there is no relevant regulation on the part with a wall thickness > 200mm or blank

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