I would contact your local galvanisers association as a reference point.
I use hot dipped galvanised bolting without any problem at 192 deg c, not sure about 300 though.
http://www.hdg.org.uk/?cms_id=94http://www.hdg.org.uk/?cms_id=94
I love and hate weldments. I have the following tips and shortfalls for you:
1. Not all weldment profiles have points to select. To check, try editing the weldment profile and check that ther are enough points. e.g an RSA angle does not have a point in the middle, adding one helps.
2. On...