E355 — high-strength seamless tube steel per EN 10210/10216. Rm 490-630 MPa. For structural hollow sections, hydraulic cylinders and mechanical engineering tubes.
E355 per EN 10210-1 (hot-finished) and EN 10216-1 (seamless pressure). Min yield 355 MPa (t<=16 mm) — same as S355 but with tighter dimensional tolerances and guaranteed through-wall properties. Standard for structural hollow sections (RHS, CHS), hydraulic cylinder tubes and mechanical engineering precision tubes.
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