Which is a correct stainless steel for a vessel with maximum stress of 380 MPa, decent corrosion resistance and good machinability?

The vessel is 20 mm thick and as to resist to sparks with temperature of 2500 K and 30 bar for hundred of microseconds and has to be realized with a 5-axis CNC.I could choose between 304, 316, 430...

05 July 2017 6,855 5 View