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Forming head for EN 13445

Forming head for EN 13445

Forming head for EN 13445

(OP)
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

RE: Forming head for EN 13445

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

RE: Forming head for EN 13445

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

RE: Forming head for EN 13445

(OP)

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?

RE: Forming head for EN 13445

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

RE: Forming head for EN 13445

Haha, okay!

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