Metal Coated Structural Steels, EN10346:2015 S220GD, S250GD, S280GD, S320GD, S350GD
General Product Description
Metal coated structural steels are made for thin-gauge structural applications that call for load-bearing capacity and good galvanic corrosion protection.
Dimension Range
S220GD is available in thicknesses of 0.45-3.00 mm and widths up to 1520 mm.
S250GD is available in thicknesses of 0.45-3.00 mm and widths up to 1520 mm.
S280GD is available in thicknesses of 0.45-3.00 mm and widths up to 1520 mm.
S320GD is available in thicknesses of 0.50-3.00 mm and widths up to 1520 mm.
S350GD is available in thicknesses of 0.50-3.00 mm and widths up to 1520 mm.
Available as coils, slit coils and as cut to length in lengths up to 6 meters.
Available dimensions vary depending on coating.
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Mechanical Properties
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COATING
STANDARD
YIELD STRENGTH RE 1)
(MIN MPa)
TENSILE STRENGTH RM
(MIN MPa)
ELONGATION A80 2)
(MIN %)
S220GD
Z, ZA, ZF
EN 10346
220
300
20
S250GD
Z, ZA, ZF
EN 10346
250
300
19
S280GD
Z, ZA, ZF
EN 10346
280
360
18
S320GD
Z, ZA, ZF
EN 10346
320
390
17
S350GD
Z, ZA, ZF
EN 10346
350
420
16
1) If no pronounced yield point is present, the 0.2 % yield point value Rp0,2 is used. If the yield point is pronounced, the values apply to the upper yield point ReH.
2) Decreased minimum elongation A80 values apply to thicknesses 0.50mm < t ≤ 0.70mm (minus 2 units) and t ≤ 0.50mm (minus 4 units).
Material Testing
Testing direction of metal coated structural steels is longitudinal to the rolling direction.
Each metal coated mother coil is regarded as one test unit. Mechanical properties (EN-ISO 6892-1) and coating mass (EN 10346) are determined per test unit.
An inspection document of the required type according to EN 10204 is provided when agreed in the order.
Chemical Composition (ladle analysis)
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C
(MAX %)
SI
(MAX %)
MN
(MAX %)
P
(MAX %)
S
(MAX %)
S220GD
0.20
0.60
1.70
0.10
0.045
S250GD
0.20
0.60
1.70
0.10
0.045
S280GD
0.20
0.60
1.70
0.10
0.045
S320GD
0.20
0.60
1.70
0.10
0.045
S350GD
0.20
0.60
1.70
0.10
0.045
Content % by mass. Metal coated structural steels are aluminium killed.
Tolerances
The tolerances of metal coated products are mainly in accordance with standard EN 10143. If no special instructions are given on the order, products are delivered with the normal tolerances of this standard. Special tolerances according to standard EN 10143 or other tolerance specification can be agreed separately at the time of order.
Coatings
The metal coated products are offered with Zinc (Z), Galfan zinc-aluminium (ZA), or Galvannealed zinc-iron alloy (ZF) coating. The cathodic corrosion protection of these metal coatings is in direct proportion to its thickness, i.e. a thick coating will provide better corrosion protection for the underlying steel than a thin coating. However, thin coatings are recommended for applications with high formability requirements.
Zinc
The Zinc (Z) coating has a composition consisting almost entirely of zinc (>99%) and is lead free, resulting in finely crystallized zinc spangle that meets high requirements for visual appearance. It is produced by hot-dip galvanizing process. Thanks to the good formability of lead-free coatings, the corrosion protection, for example, in areas which have been bent is good. The small spangle coating is designated by the letter M.
Galfan
Galfan (ZA) is a zinc-aluminium alloy coating with the eutectic composition approximately of 95% Zn and 5% Al. This coating has better anticorrosive and forming properties than normal zinc coatings. Galfan coating can be recognized by its bright metallic and mildly cellular-patterned surface. It is produced by hot-dip coating process.
Galvannealed
Galvannealed (ZF) is a zinc-iron alloy coating having an iron content of about 10%. This coating is produced by heat-treatment after continuous hot-dip coating process. ZF coated steels are excellent for resistance welding applications and are designed for use in high-quality painted products. Galvannealed coating can be recognized by its typically grayish, matte surface.
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COATING DESIGNATION
MINIMUM TOTAL COATING MASS, BOTH SURFACES *
(g/m2)
GUIDANCE VALUE FOR COATING THICKNESS PER SURFACE
(TYPICAL µm)
