The cast iron content 13. Manganese is a element to steady austenite, soits content must be limited too. The silicon help graphitization in the subsequentcooling process and affect the hardenability, therefore the silicon contentshould be as low as possible. Nickel austenitic cast iron’smatrix organization is stable austenite phase, so it is a heat-resistant,corrosion resistant materials, has also been used as a material of low thermalexpansion coefficient, the non-magnetic material and the low temperature andhigh toughness material. But nickel reduce MS points, the highamount of nickel matrix organization will contain more austenite, so that thewear resistance decreased.Source:http://www.

Nickel austenitic cast iro’s graphitestructure can be a sheet-like, also can be spherical.Nickel austenitic cast iron, after graphitespheroidization, thought it has no effect on its corrosion resistance, but cansignificantly improve its abrasion resistance. Another is containing 6% nickel,and containing about 9% of chromium.Because of nickel powderwith the ability of improving cast iron’s hardenability, so can add nickel intocast iron which containing chromium to improve its hardenability to obtainpearlite, martensite as white cast iron matrix organization.com.mhcmp.

Its base tissue for asingle austenite plus a small amount of carbides.In the Fe-C-Ni ternaryalloy, the main role of nickel is to reduce the carbon content of theco-crystal nickel, increasing the temperature range of liquid iron bytransformation mediated transformation and stable lines of stable lines,thereby suppressing the eutectic transformation carbonization precipitation,effectively reduces the chilling tendency of the cast iron.

Under normal circumstances, the nickel content mustbe determined according to the wall thickness of the casting as well as theheat treatment process. to improve its corrosion resistance and abrasionresistance, by adding niobium to improve the weldability, and so on.5 to 36% of nickelcalled nickel austenitic cast iron.In ni-hard cast iron, due to the role ofnickel, castings in the cooling conditions of the type within martensite-basedmatrix organization can be obtained. 

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