A kind of aluminum molybdenum high temperature resistant nodular cast iron containing chromium copper element and preparation method thereof

Abstract

The invention discloses an aluminum and molybdenum high-temperature-resistant nodular cast iron containing chromium and copper elements. According to the technical scheme, the aluminum and molybdenumhigh-temperature-resistant nodular cast iron containing the chromium and copper elements is characterized in that the cast iron comprises, by weight, 1.4-3.6% of C, 1.5-5.2% of Si, 2.0-9.0% of Al, 0.3-3.0% of Mo, 0.5-2.5% of Cr, 0.3-1.5% of Cu, no more than 0.06% of impurity element Mg, no more than 0.06% of impurity element S, no more than 0.15% of impurity element P, no more than 0.7% of impurity element Mn, and the balance Fe. The aluminum and molybdenum high-temperature-resistant nodular cast iron containing the chromium and copper elements can resist the working temperature of 900 DEG C,has good heat shock performance, good high-temperature oxidation resistance performance and good formability, and is low in cost.

Description

Technical field [0001] The invention relates to the field of cast iron materials, more specifically, it relates to an aluminum-molybdenum high-temperature resistant ductile iron containing chromium and copper elements. Background technique [0002] With the development of automobile engine technology, the gas emission temperature is getting higher and higher, and the working temperature of the engine exhaust pipe and turbocharger housing has increased to over 800℃. Conventional gray cast iron and ductile iron materials can no longer meet the requirements of high temperature resistance. Claim. For example, the SiMo heat-resistant ductile iron / vermicular iron on the market has a heat-resistant temperature of only 760℃ for volute and exhaust pipe products; the working temperature of low-aluminum vermicular graphite / ductile iron is below 750℃ and is Poor oxidation resistance. [0003] At present, the cast iron and cast steel materials that can meet the requirements of this high-temp...

AI Technical Summary

Problems solved by technology

[0002] With the development of automobile engine technology, the gas discharge temperature is getting higher and higher, and the working temperature of the engine exhaust pipe and turbocharger housing has increased to above 800 °C. Conventional gray cast iron and ductile iron materials can no longer meet the requirements of high temperature resistance. Require

For example, SiMo heat-resistant ductile iron / ductile iron on the market has a heat-resistant temperature of only 760°C for volute and exhaust pipe products; Poor antioxidant capacity

[0003] At present, cast iron and cast steel materials that can meet the requirements of this high-temperature working environment have the following problems in actual use and processing: high-nickel heat-resistant cast iron (D5S), because it contains more than 30% of the precious metal nickel, and the material cost High; high-temperature-resistant ferritic stainless steel, containing more than 15% of alloying element Cr, has high cost, and the casting process of stainless steel has poor forming performance and high manufacturing cost; aluminum-silicon ductile iron can withstand the working temperature of 900°C, but it is brittle , increasing the aluminum content can improve heat resistance and high temperature oxidation, but the oxidation is serious in the process of smelting and pouring, and its casting performance will be seriously deteriorated; aluminum molybdenum ductile iron / vermicular iron can withstand the working temperature of 900 ℃, and the room temperature performance is good, but Its resistance to high temperature oxidation is weak