By using electron probe microanalysis, the diffusion of W in 18Mn-3.6wt%Cr steel was measured at 1173 to 1423K. The diffusion data could be described by:

D (cm2/s) = 2.6 x 10-1 exp[-257.8(kJ/mol)/RT]

B.Million, K.Ciha, J.Krumpos, K.Stransky: Kovove Materialy, 1976, 14[6], 636-50