EN 10346:2015· Europe

S350GD

The most used steel for cold-formed purlins, light-gauge framing and decking: 350 MPa yield, 420 MPa tensile.

Hot-dip coated sheet and strip (zinc +Z, zinc-iron +ZF, zinc-magnesium +ZM, aluminium-zinc +AZ) for cold-formed members. “GD” means structural steel for coating; the coating designation and mass (e.g. +Z275) follow the grade. Mechanical values apply to the base steel, tested across the rolling direction.

All values

Strength

Yield strength ReH

Upper yield strength guaranteed by the product standard (minimum).

Condition	Value	Evidence
	≥ 350MPa	Corroborated

Tensile strength Rm

Ultimate tensile strength. Product standards give a range or a minimum.

Condition	Value	Evidence
	≥ 420MPa	Corroborated

Ductility

Elongation after fracture A

Minimum elongation; depends on gauge length and test direction.

Condition	Value	Evidence
	≥ 16%	Corroborated

Design values (Eurocode)

Design yield strength fy

Nominal value used in design calculations (before partial factors).

Condition	Value	Evidence
	350MPa	Single source

Design ultimate strength fu

Nominal ultimate strength used in design calculations.

Condition	Value	Evidence
	420MPa	Single source

Chemical composition

Show on the periodic table

S350GD, heat analysis, % by mass, maximum

Element	Applies to	Max %	Evidence
C	all thicknesses	0.20	Single source
Si	all thicknesses	0.60	Single source
Mn	all thicknesses	1.70	Single source
P	all thicknesses	0.10	Single source
S	all thicknesses	0.045	Single source

S350GD in other standards

Full comparison

“Equivalent” tables online usually match grades by name. This one compares the values each standard actually guarantees, so a 30 MPa gap in yield is visible before it is in your calculation.

Grade	Standard	Min. yield at 10 mm	Tensile at 10 mm	Match	What differs
S350GD	EN 10346:2015	≥ 350MPa2	≥ 420MPa2	—	Reference grade.
A653 SS Grade 50 Class 1	ASTM A653/A653M	≥ 340MPa2	≥ 450MPa1	Approximate	Yield 340 MPa (50 ksi), 10 MPa lower; tensile 450 MPa (Class 1), higher. Elongation 12 % on 2 in., not comparable with A80.
SGC490	JIS G 3302	≥ 365MPa1	≥ 490MPa1	Approximate	Higher guaranteed yield (365 MPa) and tensile (490 MPa); listed as the JIS counterpart.

Sources here are public pages that reproduce EN 10346:2015. For design and acceptance, the standard edition named in your specification and the inspection certificate (EN 10204 3.1) of the delivered product take precedence.