Hi guys, I need to find material compatibility to carbon steel AISI 1045 that is available locally. The closest that I can find is the SWRH 42A. All of the chemical composition matches (C, Si, P, S), except for Mn. AISI 1045 has Mn content of 0.60 - 0.90, while SWRCH 42A has Mn content of 0.30 - 0.60. This material will be subjected to cold heading process (with or without annealing process), and then heat treated (quenched and tempered) to final hardness of HRC-30. So, the question is, what does the difference in Mn content will affect me? Will it affect the hardness/tensile strength/ductility? Thanks. Chip.