Research and Production of High Stiffness and Low stress CNC Machine Tool Castings
In order to achieve the requirements of high stiffness and low stress of machine tool castings under resin sand process conditions,the carbon equivalent is increased to more than 3.8%,the silicon-carbon ratio is controlled at 0.69～0.74,the appropriate addition of trace Sn,Cr,N and other alloys,the static high temperature liquid iron and the intensive inoculation treatment can achieve HT300 machine tool castings:Tensile strength≥300 MPa,hardness 200～240 HBW,elastic modulus 120～135 GPa,as-cast residual stress≤50 MPa.
high carbon equivalenthigh silicon-carbon ratiohigh stiffnesslow stresshomogeneity
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