Material number 1.0242: S250GD
1.0242 is the European material number (Werkstoffnummer, EN 10027-2) for S250GD, hot-dip coated structural steel, guaranteed 250 MPa yield specified in EN 10346.
What 1.0242 means
EN 10027-2 material numbers have the form 1.XXYY: the leading 1 is steel; the next two digits give the steel group (02 → other structural steels); 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 1.0242 has stayed constant while the symbolic name moved from FeE250G to S250GD.
S250GD at a glance
S250GD is the first of the structural hot-dip galvanized grades in EN 10346 — the ones ordered when a roll-formed profile has to carry load and the engineer needs a yield value to design to. The designation reads S (structural steel), 250 (minimum yield in MPa), G (hot-dip coated), D (for cold forming); the coating code follows, usually +Z275 (275 g/m² zinc both faces) or, increasingly, +ZM zinc-magnesium at ZM90–ZM120 for the same corrosion life at half the mass. Werkstoff number 1.0242.
Against the forming grade DX51D, S250GD trades some ductility (19 % vs 22 % elongation) for a guaranteed 250 MPa yield and 330 MPa tensile — enough for purlins, girts, light-gauge framing, composite floor deck and cable trays designed to EN 1993-1-3. The ladder continues S280GD (the usual purlin grade), S320GD, S350GD (deck and long-span profiles), up to S550GD full-hard for roofing sheets that only need stiffness.
ASTM A653 SS Grade 37 and JIS SGC340 are the nearest equivalents; Chinese and Indian standards use the EN name or the yield number directly.
Full data sheet for S250GD → · Equivalent grades →