Tried forging with O1 tool steel for the first time tonight, got it up to temp, nice orange color. Banging along pretty good. Got it almost to 1/8 in and about an inch wide, and CRACK! out of nowhere i have this crack half way through the metal. never had this happen before on rebar rr spike or other junk metal i have used. am i doing something wrong could i have gotten some bad steel. the grain texture was very fine along the crack and pretty course everywhere else. broke a couple of pieces and found fine texture. am i working it too long or too cold. really frustrated right now. any advice of ideas. the piece was a 6 in cut from a 36 in O1 round from speedy metals.
thanks