Typical compositions for use in these applications comprise compositions according to Table VI: TABLE VI ______________________________________ % C % Mn % Si ______________________________________ 0.85 0.55 0.250.77 0.55 0.220.68 0.75 0.170.80 0.73 0.350.72 0.60 0.20 ______________________________________ With respect to alloying elements, other than C, Mn and Si, such as Ni, Cr, Co, Mo, Cu, these