EN 10346 — Continuously hot-dip coated steel flat products for cold forming. Technical delivery conditions
Scope
Hot-dip zinc (+Z), zinc-iron (+ZF), zinc-aluminium (+ZA), aluminium-zinc (+AZ), aluminium-silicon (+AS) and zinc-magnesium (+ZM) coated sheet and strip: forming grades DX51D–DX57D, structural grades S220GD–S550GD, HSLA HX grades, and multiphase steels. Specifies base chemistry, mechanical properties, coating masses (Z100–Z600, ZM70–ZM310…), surface qualities A/B/C, finishes and tests (T-bend, adhesion).
Grades covered by EN 10346
| Grade | No. | Type | C % | Yield MPa | Tensile MPa | Nearest equivalents |
|---|---|---|---|---|---|---|
| DX51D | 1.0226 | Hot-dip coated low-carbon steel for bending and profiling | ≤ 0.18 | — (no minimum; typ. 200–320) | 270–500 | CS Type B (A653), SGCC, DX51D+Z |
| S250GD | 1.0242 | Hot-dip coated structural steel, guaranteed 250 MPa yield | ≤ 0.2 | 250 | 330 | SS Grade 37 (A653), SGC340, S250GD+Z |
| S280GD | 1.0244 | Hot-dip coated structural steel, guaranteed 280 MPa yield — the purlin grade | ≤ 0.2 | 280 | 360 | SS Grade 40 (A653), SGC400, S280GD+Z |
| S350GD | 1.0529 | Hot-dip coated structural steel, guaranteed 350 MPa yield — deck and long-span profiles | ≤ 0.2 | 350 | 420 | SS Grade 50 (A653), SGC440, S350GD+Z |
Revision history and superseded standards
| Year | Change |
|---|---|
| 2009 | EN 10346:2009 — merged EN 10326 and EN 10327 |
| 2015 | EN 10346:2015 — current; ZM coatings and new grades added |
Supersedes: EN 10142 (zinc); EN 10147 (structural zinc); EN 10214 (ZA); EN 10215 (AZ); EN 10292 (HSLA); EN 10327/10326 (2004); DIN 17162 (St02Z…).
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