Material number 1.0226: DX51D
1.0226 is the European material number (Werkstoffnummer, EN 10027-2) for DX51D, hot-dip coated low-carbon steel for bending and profiling specified in EN 10346.
What 1.0226 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 1.0226 has stayed constant while the symbolic name moved from St02Z to DX51D.
DX51D at a glance
DX51D is the everyday hot-dip galvanized steel sheet: a low-carbon cold-rolled (or hot-rolled) substrate continuously coated with zinc, specified in EN 10346 for bending and profiling. Werkstoff number 1.0226; the old DIN name St02Z is still what many buyers ask for. The designation means D (flat product for cold forming), X (rolling condition not specified — may be hot- or cold-rolled), 51 (bending quality), D (hot-dip coated), plus the coating code: +Z275 is 275 g/m² of zinc over both faces (about 20 µm per side), the European default; Z100 to Z600 exist, and +ZF (galvannealed), +AZ (55 % Al-Zn), +ZA, +ZM (zinc-magnesium, ~2× the corrosion life of Z at the same mass) are alternatives.
Mechanically, EN 10346 promises only tensile 270–500 MPa and 22 % elongation — no yield minimum. That is deliberate: DX51D is for roll forming, bending and simple pressing (ducting, profiles, trapezoidal roofing, drywall track). For drawing, the ladder runs DX52D → DX53D → DX54D → DX56D; for load-bearing profiles the structural grades S220GD–S550GD guarantee yield.
JIS SGCC, GB DX51D+Z and IS 277 are the same class; ASTM A653 CS Type B G90 is the nearest American equivalent.
Full data sheet for DX51D → · Equivalent grades →