Nodular cast iron with toughness and high-temperature performance, and preparation method thereof

Abstract

The invention relates to nodular cast iron with toughness and high-temperature performance. The nodular cast iron with toughness and high-temperature performance comprises the following components in percentage by weight: 3.5% to 3.9% of C, 2.3% to 2.6% of Si, 0.3% to 0.6% of Mn, 0.02% to 0.08% of Mg, 0.01% to 0.05% of RE, 0.01% to 0.05% of Al, 1% to 2% of Cr, 0.3% to 0.8% of Ni, 30% to 150% of Cr / Al, 10% to 70% of Ni / Al and the balance of Fe and inevitable impurities. A preparation method of the nodular cast iron comprises the steps of smelting, nodulizing, inoculating and pouring.

Description

technical field [0001] The invention relates to a ductile cast iron with both toughness and high-temperature performance, which has excellent high-temperature strength and high-temperature oxidation resistance and excellent mechanical properties (especially toughness) at room temperature, and meets common ductile iron applications such as crankshafts, camshafts, In addition to applications such as connecting shafts, connecting rods, and gears, the ductile iron of the present invention is also particularly suitable for high-temperature working conditions such as engine components, turbocharged components, piston rings, exhaust manifolds, grates, boilers, and sintering trolleys. Applied widgets. Background technique [0002] Compared with steel, the cost of ductile iron is lower, and the performance is similar to steel, so ductile iron is regarded as an ideal material for "substituting iron for steel". [0003] In high-temperature working conditions, such as piston rings, exh...

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Problems solved by technology

[0004] As known in the art, Al, Cr, and Ni are all elements that can improve the high-temperature oxidation resistance of ductile iron, but the addition of Al generally reaches more than 5%, and the addition of Ni and Cr is even higher, and some can even reach 15%. % or more, although adding the above elements in ductile iron can improve the high temperature oxidation resistance, but when the content of Cr, Al and Ni is high, the toughness of ductile iron will drop sharply, making the material brittle and easy to crack during use, and adding Ni , Cr, and Al high-temperature-resistant nodular cast iron does not consider the strength characteristics at high temperatures, and the reliability of work at high temperatures cannot be guaranteed, resulting in limited application of nodular cast iron materials

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