DX51D vs DX52D: differences explained
DX51D vs DX52D: the same galvanized coil, one forming class apart. DX51D bends, DX52D draws — and the difference shows up as cracks at the radius, not on the certificate.
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Overview
Every hot-dip galvanized coil in EN 10346 starts from this family, and the two lowest classes cover almost all of the volume. DX51D is the commercial grade: it bends, roll-forms and profiles happily. DX52D is the drawing grade: tighter carbon, better elongation, and the class a press shop asks for when a part has a deep radius or a stretched corner.
Neither has a guaranteed minimum yield — they are forming grades, not structural ones. If a drawing needs a yield value on a galvanized coil, the family to read is S220GD to S550GD, not DX.
DX51D vs DX52D side by side
| Property | DX51D | DX52D |
|---|---|---|
| Standard | EN 10346:2015 | EN 10346:2015 |
| Material number | 1.0917 | 1.0350 |
| Class | Commercial forming | Drawing quality |
| Yield Re | 140–320 MPa (typical, not guaranteed) | 140–300 MPa (typical, not guaranteed) |
| Tensile Rm | 270–500 MPa | 270–420 MPa |
| Elongation A80, min. | 22 % | 26 % |
| r90 value (deep draw) | Not specified | Not specified (DX53D and above: ≥ 1.3) |
| Max C | 0.12 % | 0.12 % |
| Max Mn | 0.60 % | 0.60 % |
| Max P / S | 0.10 / 0.045 % | 0.08 / 0.040 % |
| Typical bend radius | 1.0–1.5 × thickness | 0.5–1.0 × thickness |
| Ageing resistance | Not guaranteed | Guaranteed 6 months (as DX52D+Z) |
| Coating options | Z, ZF, ZM, AZ, AS | Z, ZF, ZM, AZ, AS |
| Surface classes | A or B, MB / MC / MA spangle | A or B, usually MB minimum |
| Common thicknesses | 0.25–3.0 mm | 0.30–3.0 mm |
| Price index | 100 | 103–108 |
| Typical use | Roofing, purlins, ducting, profiles, tube | Pressed panels, appliance parts, deeper draws |
| Next class up | DX52D | DX53D, then DX54D (best draw) |
| JIS closest | SGCC | SGCD1 |
| ASTM closest | A653 CS Type B | A653 FS / DS Type B |
Which should you choose?
DX51D for anything bent, rolled or profiled — which is the overwhelming majority of galvanized coil sold. DX52D when the part is pressed and the radius is tight, or when the coil will sit in stock for months and stretcher-strain marks would be unacceptable. The price difference is small; the cost of scrapping a pressed batch is not. If DX52D still cracks, the problem is the class, not the supplier: go to DX53D or DX54D.
- Roof and wall sheet, trapezoidal and corrugated profiles
- Purlins, cable tray, ducting and light framing
- Welded tube and hollow section made from galvanized strip
- Simple bends and roll forming where the radius is a millimetre or more
- Cost-driven volume work — this is the default grade in the market
- Pressed and drawn parts: panels, housings, brackets with a stretched corner
- Anything where a crack at the radius would scrap the part
- Coil that will be stored for months before forming — ageing resistance is guaranteed
- Painted parts where stretcher-strain marks would show through the finish
- When the press shop already had trouble with DX51D on the same tool
Frequently asked questions
What is the difference between DX51D and DX52D?
Forming class. DX52D has a higher guaranteed elongation (26 % against 22 %), tighter phosphorus and sulphur, guaranteed ageing resistance and a smaller minimum bend radius. Both are galvanized coil to EN 10346 with no guaranteed minimum yield.
What does the D in DX51D mean?
It marks the family for hot-dip coating: D for coated flat products, X for a hot- or cold-rolled base at the mill's choice, and the trailing D for hot-dip coating. DX52D is the same convention one class up.
Can I substitute DX52D for DX51D?
Yes — every forming property is equal or better. The reverse is a downgrade and should not be accepted on pressed parts without a trial.
Which one do I use for roofing sheet?
DX51D+Z is the standard choice, usually in Z100 to Z275 depending on the environment. The forming in a roll-formed profile is well within its class.
Do these grades have a yield strength?
Not a guaranteed minimum. Typical values are quoted for information only. If the design needs a yield figure, use the structural galvanized family: S220GD, S250GD, S280GD, S320GD or S350GD.
What does the +Z suffix mean?
The coating type: Z is pure zinc, ZF is galvannealed, ZM is zinc-magnesium, AZ is aluzinc and AS is aluminium-silicon. It is written after the grade, as in DX51D+Z275.
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Verified against EN 10346:2015. Last checked: October 2026.