Forming head for EN 13445

[ElCidCampeador]

Hello, I have this elliptical head 2:1, cold formed from plate, with forming strain=6,2% acc. to ASME VIII Div.I UG-79 formula and deformation F=28,52% acc. to EN 13445-4 9.2-1.
Applicable construction code is EN 13445.
Head is not for lethal service and starting thickness is 12mm.
Material: ASTM SA/A 516 Gr.70N
Question: does the head need to be heat treated or not? tnks

 

[Caloooomi]

It's GR.70N so already heat treated?

GR.70 = P355GH (EN 13445-2, Table E.2-1, plate and strip - material group 1.2)

9.4-1 in EN 13445-4
Material group 1.2, If F > 5%, yes to heat treatment
Thermo mechanically treated steel note does not apply

 

[ElCidCampeador]

Gr.70N is supplied normalized. So is HT still necessary? Even if from plate?

 

[ElCidCampeador]

Caloooomi, I've just read par.8 of EN, but my head is COLD formed from plate. "Hot forming" of 9.3.2 in EN refers to this phase I think, not to the treatment of the plate itself. Or not?

 

[ElCidCampeador]

Sorry, my fault! I have a wrong version of EN with missing pages...
Ok, table 9.4-1 is clear: thank you!

 

[Caloooomi]

Haha, okay!