Material number 1.0576: S355J2H
1.0576 is the European material number (Werkstoffnummer, EN 10027-2) for S355J2H, non-alloy structural steel for hollow sections, 355 MPa, −20 °C impact specified in EN 10219.
What 1.0576 means
EN 10027-2 material numbers have the form 1.XXYY: the leading 1 is steel; the next two digits give the steel group (05 → steels 0.25–0.55 % C or Rm 500–700 MPa); the last two digits are a sequential number within that group. The number is unique to one composition and survives name changes, which is why 1.0576 has stayed constant while the symbolic name moved from St52-3 (Hohlprofil) to S355J2H.
S355J2H at a glance
S355J2H is the grade engineers write on the drawing when a hollow section is a primary member: columns, truss chords, crane and stadium structures, offshore and machinery frames. It is S355J2 — 355 MPa yield, 470–630 MPa tensile, 27 J at −20 °C — delivered as a structural hollow section (H) under EN 10219 (cold-formed welded) or EN 10210 (hot-finished). Werkstoff number 1.0576. The −20 °C toughness is what separates it from S355J0H (0 °C) and makes it the default in EN 1090 EXC2/EXC3 components and in cold-climate export markets.
Cold-formed EN 10219 sections are roll-formed and HF-welded from S355J2 strip; the corners work-harden, elongation is 20 % (22 % hot-finished) and buckling curve c applies. For fatigue-loaded or dynamically loaded members, EN 10210 hot-finished sections — stress-relieved, larger corner radii, curve a — are preferred, at a premium. Thermomechanical S420MH/S460MH exist in EN 10219 for weight-critical trusses.
ASTM A500 Grade C and A1085, JIS STKR490, GB Q355B/D and GOST 09Г2С tube are the market equivalents.
Full data sheet for S355J2H → · Equivalent grades →