Hot Rolled or Colled Roll Steel Frames

[MidMichigan]

I am in the planning process of building a 30' steel tug. As I am preparing to purchase steel a question formed in my mind. Should the Frames, Longitudinals, Carlins, and other interior framing be made from cold rolled steel or hot rolled steel? These are 3/16" or 1/4" bar stock. I can't seem to find that answer. Maybe it doesn't matter and I am just over thinking it!

Thanks for any help,

[tazmann]

Co;d roll is nice for machining, sharp corners, cost more, and will rust fast as soon as you clean the oil off. I think Hot roll would be a better choice.
Tom

[wardd]

hot rolled is more stable as it dosnt have the internal stresses that cold rolling imparts and is less heat sensitive ie welding and such

[MidMichigan]

Thank you for your input. I was thinking hot rolled too. Seems like the radius corners would only be a plus on the longitudinals as the sheet is wrapped over it. Primer would flow into the joint easier too.