S320GD steel
S320GD steel chemical composition is tailor-made for high durability and corrosion resistance, and is thus great for structural applications. It usually has low carbon, manganese, phosphorus, and sulfur levels to strike a balance between strength and workability. S320GD has improved galvanization properties from the zinc coating, granting higher protection against environmental wear and corrosion when compared with other steel grades like S235 or S355. This particular patch of qualities gives it a set of features that make it an apt choice in construction and in fabrication.
S320GD Steel Coil & Strip Coatings
| Coating Designation | Total Coating Mass (g/m², both sides) | Coating Thickness (µm per side) |
| Z100 | 100 | ~7 |
| Z140 | 140 | ~10 |
| Z200 | 200 | ~14 |
| Z275 | 275 | ~20 |
| Z350 | 350 | ~25 |
- Key Considerations:
A thicker coating improves protection against corrosion, making it perfect for demanding outdoor conditions.
Lower coating weight is often chosen for indoor applications or painted surfaces, where additional protection is unnecessary.
The coating is applied uniformly during the hot dip galvanization, ensuring consistent protection across the steel surface.
GNEE STEEL offers customized coating options to meet specific industry needs, ensuring optimal performance in construction, automotive, and manufacturing applications.
Surface Treatments
In order to prevent formation of white rust during transportation or storage, the following surface treatments are available:
Chemical passivation (C)
Unless otherwise agreed, zinc and Galfan coated coils and sheets are delivered as chemically passivated. A thin passivation layer remains on the surface of the product. The purpose of this is to protect the coating against the formation of white rust during transportation and storage. This treatment is not sufficient, however, for protection under all conditions.
Oiling (O)
If required, oiling can be used instead of chemical passivation. Metal coated products to be painted are recommended to be delivered in oiled condition and therefore Galvannealed coated coils are delivered as oiled, unless otherwise agreed. The temporary corrosion protection provided by oil is especially dependent on storage time, and therefore long storage times should be avoided with oiled products.
Chemical passivation and oiling (CO)
Passivation with oiling is also available for maximum surface protection.
Unprotected (U)
In unprotected condition, i.e. without surface treatment, there is a risk for formation of corrosion products and scratches during transportation, storage or handling. The products are supplied without surface treatment only if explicitly required by the customer on its own responsibility.
Specifications Table
| Quality | Standard | Material No. | Available coatings |
|---|---|---|---|
| S320GD | DIN EN 10346 | 1.0250 | +Z, +ZF, +ZA, +ZM, +AZ, +AS |
| Testing direction | Yield strengthRP02 (MPa) |
Tensil Strength Rm (MPa) |
Elongation A80 (in %) |
|---|---|---|---|
| L | ≥ 320 | ≥ 390 | ≥ 17 |
| C % |
Si % |
Mn % |
P % |
S % |
|---|---|---|---|---|
| ≤ 0,20 | ≤ 0,60 | ≤ 1,70 | ≤ 0,10 | ≤ 0,045 |
Available Steel Grade
|
Available Steel Grade(Ensure weight and support third-party testing) |
||||
|
Steel grade |
Coating |
Yield(MPA) |
Tensile(MPA) |
Elongation(%) |
|
DX51D |
Z,ZF |
-- |
270-500 |
20 |
|
DX52D |
Z,ZF |
140-300 |
270-420 |
22 |
|
DX53D |
Z,ZF |
140-260 |
270-380 |
26 |
|
DX54D |
Z,ZF |
140-220 |
270-350 |
30 |
|
S220GD |
Z,ZF |
220 |
300 |
18 |
|
S250GD |
Z,ZF |
250 |
330 |
17 |
|
S280GD |
Z,ZF |
280 |
360 |
16 |
|
S320GD |
Z,ZF |
320 |
390 |
15 |
|
S350GD |
Z,ZF |
350 |
420 |
14 |
|
S400GD |
Z,ZF |
400 |
470 |
-- |
|
S450GD |
Z,ZF |
450 |
530 |
-- |
|
S500GD |
Z,ZF |
500 |
560 |
-- |
|
Select type Galvanized Steel based on requirements |
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FAQ:
What surface finishes are available for S320GD galvanized steel?
Typical surface finishes include regular spangle, minimized spangle, and zero spangle, depending on application requirements.
How long does S320GD+Z275 galvanized steel last?
In normal environments, S320GD+Z275 can provide corrosion protection for 15–30 years, depending on exposure conditions.
What is the tensile strength of S320GD galvanized steel?
The tensile strength typically ranges from 420 MPa to 550 MPa.
Is S320GD galvanized steel suitable for structural framing?
Yes. It is specifically designed for structural use, offering reliable strength and durability for framing systems.
Can S320GD galvanized steel be painted?
Yes. Galvanized steel can be painted after proper surface treatment, such as cleaning or light passivation.
