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Hey guys I recently made some sanmai 1018/1084 and all of my welds were solid and has no delamination of any sort. I went to heat treat it, thermal cycled 4 times and then quenched in mcmastercarr super quench. The blade passed the file test with flying colors. However upon further inspection there was a crack in the middle of the core steel running the length of the blade...like it just wanted to spilt in 2. What cause this and what am I doing wrong? I know people make low carbon sanmai with a high carbon core all the time. I suspected that I may have over heated it so I took it to the vice a