hot-dip galvanized structural steel
S320GD+Z hot dip galvanized plates(coils) are featured with strong coating adhesiveness, high erosion-resistance, accurately controlled zinc coating thickness, high size precision, flat profile and good mechanical, processing and welding performance. They can be used for making outside and inside automotive plates, structural parts and reinforcements.
Properties
S320GD combines high strength with good formability and corrosion resistance. The minimum yield strength Rp0.2 of 320 N/mm² and a characteristic tensile strength (Rm) of at least 390 N/mm² ensure reliable load-bearing capacity even under changing load conditions. The elongation at break A80 of at least 17 % also allows safe forming and profiling processes.
The hot-dip galvanizing options offer the following specific advantages:
+Z (pure galvanized):
Standard corrosion protection for general conditions.
+ZF (zinc-iron):
Improved coating adhesion and increased resistance to mechanical stress.
+ZA (zinc-aluminium):
Optimized resistance in atmospheric environments.
+ZM (zinc-magnesium):
Extended protection in maritime and saline zones through passivating behavior.
+AZ (aluminum-zinc):
Combination of heat resistance and corrosion protection, ideal for high surface temperatures.
+AS (aluminum-silicon):
Especially for applications with extreme temperature influences and high corrosion loads.
In addition, S320GD has a homogeneous microstructure, good weldability and excellent dimensional stability, which enables precise further processing in cutting, bending and welding processes.
S320GD Galvanized Steel Chemical Composition
| Element | Maximum Content (%) |
| Carbon (C) | 0.2 |
| Silicon (Si) | 0.6 |
| Manganese (Mn) | 1.7 |
| Phosphorus (P) | 0.1 |
| Sulfur (S) | 0.045 |
S320GD Galvanized Steel Mecahmical Properties
| Property | Value |
| Tensile Strength (Rm) | 290 – 390 MPa |
| 0.2% Proof Strength (Rp0.2) | ≥ 320 MPa |
| Minimum Elongation (Lo = 80 mm) (A) | ≥ 17% |
Note:
The minimum elongation requirement varies with thickness:
0.5 mm < t ≤ 0.7 mm: The minimum elongation is reduced by 2% compared to the listed value.
0.35 mm < t ≤ 0.5 mm: The minimum elongation is reduced by 4% compared to the listed value.
t ≤ 0.35 mm: The minimum elongation is reduced by 7% compared to the listed value.
The tensile strength range for this grade can vary by up to 140 MPa, depending on processing conditions and coating specifications.
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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Frequently Asked Questions (FAQ)
Q: What is the S320GD grade in structural steels?
A: The S320GD grade refers to a type of coated structural steel with a yield strength of at least 320 MPa, commonly used for its good strength and formability. It is often utilized in a range of industries, including construction and manufacturing.
Q: How is S320GD steel typically coated?
A: S320GD steel is commonly coated through a continuous hot-dip process, using materials like zinc or a zinc-iron alloy (ZF) for corrosion protection. This coating enhances the steel's durability in harsh environments.
Q: What are the common applications of S320GD steel?
A: S320GD steel is widely used in constructing roofs, enclosures, and other structural components due to its good weldability, strength, and corrosion resistance. Its high-quality finish makes it suitable for both visible and structural applications.
Q: What are the dimensional specifications for S320GD steel coils?
A: S320GD steel coils are available in various thicknesses, typically ranging from 0.35 mm to 0.50 mm. These coils are produced to meet specific industry standards and dimensional requirements.
Q: How does the zinc coating on S320GD steel improve its properties?
A: The zinc coating on S320GD steel provides better corrosion resistance, significantly enhancing the steel's longevity and performance in harsh environments. This is crucial for maintaining the integrity of structures exposed to the elements.
