QT700-8 nodular iron casting for automobile accessory production and production process of QT700-8 nodular iron casting

Abstract

The invention relates to QT700-8 nodular iron casting for automobile accessory production. The QT700-8 nodular iron casting is characterized by comprising the following components: 4.50-4.80% of C, 1.70-2.0% of Si, less than 0.20% of Mn, less than 0.03% of P, less than or equal to 0.01% of S, 0.30-0.4% of Cu, less than 0.02% of Sn, less than 0.02% of Bi, 0.01-0.020% of Sb, less than or equal to 0.035% of S, 0.038-0.06% of Mn, 0.02-0.04% of RE and the balance of iron and inevitable impurities. The QT700-8 nodular iron casting has the beneficial effect of raw materials used is the same to that for producing common nodular iron casting, the casting process is simple and suitable for common clay green sand, the burdening process and the production process are suitable for industrial batch production, and the stability of the mechanical property is good.

Description

technical field [0001] The invention relates to the field of auto parts castings, in particular to QT700-8 ductile iron castings for production of auto parts and a production process thereof. Background technique [0002] Ductile iron is a casting alloy developed in the late 1940s. It is a spherical graphite cast iron obtained by adding nodularizers and inoculants to molten iron. Due to the spherical shape of graphite, its mechanical properties are far superior to gray cast iron, better than malleable cast iron, even close to steel, but the price is lower than steel, and it has many excellent performances, such as low stress concentration and good impact resistance. Therefore, many important mechanical parts, such as crankshafts, connecting rods, valve bodies, cylinder liners, etc., can be made of ductile iron to save steel and reduce costs. Development, has become an important engineering material, and has been widely used in industrial production. At present, there are 14...

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Problems solved by technology

[0003] In order to meet the demand of high-strength and high-toughness ductile iron castings, a series of high-strength and high-toughness new ductile iron casting materials must be developed. At present, the research and development of such products abroad is only the Swiss GF company to form a series of products , is in the stage of popularization and application. Domestic research on high-strength and high-toughness ductile iron is mainly obtained through heat treatment, and there is no stable process that can meet industrial mass production.