Are you comfortable with your steam generation and steam box? Bending is more than wood thickness.
Your box must generate at least 95 degrees C. I would suggest each piece for say 10 minutes. longer is not better. And once you get it out of the box, work as quick as hell! Have it all set up and ready to go.

PS I found a babies warming thermometer in a cheap shop. It did the job well. Just poked it through a hole drilled in the box!.

I also had to have TWO heat sources to get the required steam temperature. I used an electric fry pan with the controller set at max (10) as the water source and the lid to start the "Chimney" to the box, then I used a camping gas burner under the fry pan! You do this at your own risk.
I know others who have done this infact that is how I got to know about it.

: Hardwoods, like ash and oak are usually used for steam bending, softwoods
: generally don't respond well with steam.

: Personally I'd rip that piece into thinner strips and laminate them together
: after they are bent, bending to a relatively small diameter with 1/2"
: will be a serious challenge. Unless you are talking a long pointed flat
: stern cockpit shaped kinda like a Klepper's cockpit, then won't be a
: problem.

: Bill H.