Newbie machining stainless steel grade 304

I need help since i got no experience in cutting sus. i got a part which is a mold. i start by cutting pocketing which i normally do with AL and my ball nose cutter flatten.The whole thing BURN!!!btw i use coolant.
Tool Dia=10mm
Flutes = 2
Stickout = 40mm
stepover = 1mm
RPM = 8000
cut depth =0.5mm
feed rate= 850mmpm

pls advice...