EN 10346 Standard Steels For Structural Applications

EN 10346 is the European standard for continuously hot-dip coated steel flat products. It sets the requirements for the steel substrate, the metallic coating, and the mechanical properties. The coating types it defines are:

Two grade families exist inside EN 10346. The SxxxGD family is for structural use and guarantees a minimum yield strength. The DXxxD family is for forming and drawing. This page covers the structural grades. If your part is deep drawn, ask us for DX51D to DX57D instead.

This is the question most buyers get wrong. Higher grade is not automatically better - it costs more and it is less formable.

Rule of thumb: if you are replacing S355 section steel with coated sheet, start at S350GD. It gives the same 355 MPa yield you designed for, without a recheck of the section modulus.

Values are minimums, tested transverse. Actual values on the mill certificate govern.

Thickness and width are not freely combinable at the extremes. Confirm the exact pairing when you order.

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This is where most projects either overspend or fail early. Use the environment, not habit.

Z80 (80 g/m²) and Z725 (725 g/m²) are not standard EN 10346 designations. We can supply them, but they fall outside the standard and must be quoted separately.

Coastal or agricultural site? Zinc alone is often not the best answer. ZM (zinc-aluminium-magnesium) protects cut edges and punched holes far better than pure zinc at the same coating mass. Ask us for a ZM alternative at the same price band.

Use this only for a first comparison. The mill certificate is the binding record.

Note: ASTM A653 SS Grade 50 guarantees 345 MPa yield, not 350 MPa. If your design is written to EN 10346, order the EN grade.

If you do not specify, we deliver NA.

1.Which EN 10346 grade replaces S355?

S350GD. It carries the 355 MPa minimum yield that S355 designs are built on, with a coating on top.

2.Is Z275 always the right choice?

No. Z275 is the safe default for outdoor building. In dry interiors Z140 is enough and cheaper. In coastal or agricultural air, ZM coating at a lower mass usually outlasts Z275 at the same cost.

3.Can I get a coating heavier than Z600?

Yes, up to Z725 by agreement. It is outside EN 10346 and quoted case by case.

4.Do you supply the EN 10204 3.1 certificate?

Yes, with every shipment. It shows heat number, mechanical test results and actual coating mass.

5.What is the difference between Z and ZF?

Z is pure zinc with a spangle. ZF is zinc-iron, heat-treated after coating, giving a matte grey surface that paints better. ZF is slightly less ductile in bending.

6.Can you slit the coil to narrower widths?

Yes. Slitting, cut-to-length and sheeting are done in-house before packing.

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