By weight:
70% Sodium carbonate
10% Borax
20% Powdered charcoal
That setup was placed into the lab kiln and fired up until it had reached 900C (give or take an hour and a half). As I have found in my experimental practice, the aforementioned mix really speeds up the carbon diffusion into steel above 800C and within three hours one can achieve a case that is in excess of 2mm deep regarding really high carbon content layer. The less saturated layer extends even deeper.
After the kiln had reached 900C, the tap was pulled out of the receptacle and hard quenched into water
bbs.homeshopmachinist.net/threads/78700-Unconventional-tap-making
O mieszankach węgla z sodą już słyszałem, ale co tu robi boraks?
W wolnej np. makaroniarze zamiast bolszewików robili z grubsza to samo.asasello pisze:Kiedyś było łatwo - przyjeżdżali towarzysze z Sojuza i kazali potłuc młotkami albo zabrali na wschód.A gdzie są prototypy z "Wolnej Polski"?