Modification body

Abstract

The invention relates to a modification body for the production of spheroidal graphite cast iron and to the method for producing a cast part using the modification body according to the invention, and to the cast part itself. The modification body serves for the production of spheroidal graphite cast iron, in particular with a predominantly ferritic structure, containing a carrier material, preferably an iron-silicon alloy, wherein the modification body contains 7-16 weight percent of boron.

1 . A modification body for the production of spheroidal graphite cast iron with a predominantly ferritic structure, the modification body comprising:
 a carrier material; and   boron,   wherein the boron content of the modification body is 7-16 percent weight.   
     
     
         2 . A method for production of a cast part made of spheroidal graphite cast iron, the method comprising:
 inserting, into a casting system prior to casting, at least one modification body comprising a carrier material and boron, wherein the boron content of the modification body is 7-16 percent weight.   
     
     
         3 . The method for the production of a cast part made of spheroidal graphite cast iron according to  claim 2 , wherein the at least one modification body is inserted, prior to casting, into the casting system between a pouring cup and a filter. 
     
     
         4 . The method for the production of a cast part made of spheroidal graphite cast iron according to  claim 2 , wherein at least one modification body is added to a melt prior to casting. 
     
     
         5 . The method for the production of a cast part made of spheroidal graphite cast iron according to  claim 2 , wherein a number of the at least one modification body is chosen so as to achieve a boron content in the cast part of 0.002-0.008 percent weight. 
     
     
         6 . The method for the production of a cast part made of spheroidal graphite cast iron according to  claim 2 , wherein a number of the at least one modification body is chosen so as to achieve a Brinell hardness of at most 170 HB. 
     
     
         7 . A cast part, the cast part being produced by a method comprising:
 inserting, into a casting system prior to casting, at least one modification body comprising a carrier material and boron, wherein the boron content of the modification body is 7-16 percent weight,   wherein the cast part is made of spheroidal graphite cast iron and has a boron content of 0.002-0.008 percent weight.   
     
     
         8 . The cast part according to  claim 7 , wherein the cast part has a maximum Brinell hardness of 170 HB. 
     
     
         9 . The cast part according to  claim 7 , wherein the cast part has a predominantly ferritic structure. 
     
     
         10 . The modification body according to  claim 1 , wherein the carrier material is an iron silicon alloy. 
     
     
         11 . The method for the production of a cast part made of spheroidal graphite cast iron according to  claim 5 , wherein the cast part made of spheroidal graphite cast iron has a predominantly ferritic structure. 
     
     
         12 . The method for the production of a cast part made of spheroidal graphite cast iron according to  claim 6 , wherein the Brinell hardness is in the range 140-170 HB. 
     
     
         13 . The cast part according to  claim 8 , wherein the Brinell hardness is in the range 140-170 HB.