Dear Sir,
we are manufacturer of machinery parts for various industries, here we made one nitriding job in that there were 15 hole of M30x0 mm deep but some how while sending in nitriding our person made mistake to make thread and only we sent this job in nitriding, now we would like to make theread but we have already tried to tapping it but all tapes were cracked . now we would like to know from you how to remove the hardness in hole where we would like to do tapping, wery sommothly is there any chemical by which we can remove that surface hardness ?
looking forward to hearing from you soon
shailesh mehta
CR4
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