I agree. After I posted I was thinking that this is not really the same thing as quench cracking in a single alloy steel. It still makes sense to make the tail end of the quench as gentle as possible though.
Printable View
I have done several razors now in Suminagashi and I heat up my medium speed quenching oil (same I use for 01) to 80c. No cracks, splits or anything. It has been flawless so far. This MO works great for me.
I tested quenching with A. a faster quenching oil (Parks 50) and B. with lower temps using both fast and medium oil (50C and 60C) and I got cracks towards the edge.
That settles it then. I probably quenched too cold. I'll have to buy a cheap fryer and mount it my quench tank
I've been heating my oil in a double boiler set up and using a candy thermometer. The double boiler works well in that I can also easily cool the oil with a bath of cool water if I get it too warm.
When Quenching I use a dual read out Thermo couple
1 in my forge & 1 in my oil
Attachment 220408Attachment 220409
Nice setup, thank you for sharing!
Okay so I went to customer service and got response next day :<0)
Thank you very much for your inquiry.
The item comes with instruction:
Attachment 220494
Best regards
Customer Service
Update!
I maked a kamisori and everything was perfect. The grindig was difficult as Bruno said. I am pleased with the results. I got fine and sharp edge. Thank you for your help!
My process:
I leaved 1.5 mm thikness of the edge.
soaking: 805C / 1480F, 8 min.
quenching oil: 80C 20 sec - Thanks Maximilian
tempering: after cooling to room temperature, 210C 2x1h (between cooling to room temperature)
After this I sanded a few tenths of millimeters from the edge.
Attachment 221384