Thank you for your response. You are probably right about the grades not being offical grades listed in SS 14. They are actually Volvo standards, I just assumed that they where also offical SS grades, since most Volvo steel grades are.
The correct material grades are therefore:
V-1580
V-2904...
I've tried that page, but the data they're operating with on this specific material can't be right. According to the material property finder, the material har Su lower than Sfl. This can't be right?
Does anyone know where I can find a Wöhler-curve (S-N curve) for this material: http://www.matweb.com/search/SpecificMaterial.asp?bassnum=M414BM
Primarily I'm interested in R=-1 and R=0 curves, but any help is greatly appreciated.