... without drawings.Please find the detailed infomation about bimetallic assembly parts of screw barrel as below:Technical Data: Bimetallic layer analysis38CrMoAlA ... : Cr, C, Si, Mn, Mo, Al, Ni, Cu, P, S40Cr: Cr, Mn, C, Si, Ni ... steel: Cr, Ni, Ti, Mn, N, Nb, Mo, Si, CuSKD61: C, Si, Mn, Cr, Mo, V, S, PFerrous alloy: Fe, Cr, Si ...