What is the material of SGC340+Z steel coil?
SGC340+Z is a hot-dip galvanized steel sheet in the Japanese Industrial Standard (JIS G 3302)
SGC: Hot Dip Galvanized Steel
340: Minimum tensile strength 340 MPa (actual range 340-420 MPa)
+Z: Zinc Coated, the coating amount in the Japanese standard is marked as a single-sided value (such as Z18 = 180g/m² on a single side)
Element
|
Element |
C |
Mn |
P ≤ |
S ≤ |
Si |
|
Content |
≤0.12% |
0.30-0.60% |
0.04% |
0.03% |
≤0.03% |
Coating structure
Pure zinc layer (η phase): 80-90%, purity ≥ 99.8% (JIS requirement)
Zinc-iron alloy layer (δ phase): thickness 1-3μm, enhanced adhesion
What are the differences between SGC340+Z, DX54D+Z and SGCC340?
|
Comparison items |
SGC340+Z (Japanese standard) |
DX54D+Z (European standard) |
SGCC340 (Winning Bid) |
|
Zinc layer purity |
≥99.8% |
≥99% |
≥99.5% |
|
Surface control |
Small and medium zinc flowers (3-8mm) |
Can be customized without zinc flower |
Conventional zinc spangles |
|
Formability |
r value ≥1.4 |
r value ≥1.2 |
r value ≥1.3 |
|
Applicable standards |
JIS G 3302 |
EN 10346 |
GB/T 2518 |
What is SGC340+Z galvanized steel coil equivalent to?
|
Standard system |
Equivalent/similar grades |
Key differences |
Applicable suggestions |
|
China GB/T |
DX53D+Z |
Higher elongation requirement (≥26% vs 22%) |
Domestic non-automotive structural parts |
|
Europe EN 10346 |
DX54D+Z |
Different zinc layer marking method (total of both sides) |
General replacement for European projects |
|
US ASTM A653 |
CS Type B |
Stricter sulfur content limit (S≤0.025%) |
North American export projects |
|
Korea KS |
SGHC 340 |
Same zinc layer purity requirement (≥99.8%) |
Korean supply chain |
|
International ISO |
CR340GD+Z |
Basically the same technical parameters |
International bidding projects |
Completely equivalent replacement
SGHC 340 (Korean standard): The performance is closest, but the zinc layer marking method needs to be confirmed
CR340GD+Z (ISO): A general choice for international projects
SGC340+Z galvanized steel coil is used for?
SGC340+Z steel has the following advantages:
High strength and light weight: 340-420MPa tensile strength, 15% thinning without loss of performance)
Good anti-corrosion performance: zinc layer purity ≥99.8% (JIS standard), Z22 coating salt spray test up to 1500 hours without red rust, life 20% longer than European standard materials of the same grade
Good formability: elongation ≥22%+r value 1.4, complex stamping parts qualified rate 99.5% (actual measurement), smooth surface (Ra 0.8μm) directly suitable for spraying.
So it is applied to：
Automobile manufacturing
Body covering parts: door inner panel, trunk lid (Z18 coating)
Chassis protection parts: fender, fuel tank guard plate (Z22 coating + chromate passivation)
Home appliance industry
Air conditioner outdoor unit: shell, bracket (Z18 coating)
Washing machine drum: inner drum reinforcement (Z22 coating + fingerprint-resistant treatment)
Construction field
Light steel structure: roof tile, wall panel (Z22 coating)
Cable tray: trough tray (Z18 coating + chromium-free passivation)
