What is the material of SGH440+Z steel?
SGH440+Z is a high-strength hot-dip galvanized steel coil with excellent mechanical properties and corrosion resistance, widely used in the automotive, construction, home appliance and other industries.
SGH: Steel Galvanized High-strength (high-strength galvanized steel)
440: Minimum tensile strength is 440 MPa (high-strength grade)
+Z: The galvanized layer is passivated (stronger rust resistance)
What is the difference between SGH440+Z steel and DX51D?
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Comparison items |
SGH440+Z |
DX51D |
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Material category |
High-strength galvanized steel |
General commercial galvanized steel (mild steel) |
|
Main standard |
JIS G 3321 (Japanese standard) |
EN 10346 (European standard) |
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Tensile strength (MPa) |
≥440 |
270~330 |
|
Yield strength (MPa) |
≥300 |
140~240 |
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Elongation (%) |
12~18 (lower) |
22~26 (easier to form) |
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Galvanized layer (double-sided) |
Z60~Z275 (customizable thick coating) |
Z60~Z180 (thin coating economical type) |
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Surface treatment |
+Z (passivation), +O/+ZF optional |
+Z/+O (optional passivation or oiling) |
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Substrate process |
Cold-rolled/hot-rolled micro-alloyed steel |
Cold rolled low carbon steel |
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Typical application |
Automotive structural parts, shelves, machinery |
Household appliance housing, lightweight building covering |
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Applicable environment |
High load + severe corrosion environment |
Light load + general anti-corrosion requirements |
Is SGH440+Z galvanized steel coil low carbon steel?
The base material of SGH440+Z steel coil is usually low carbon steel or micro alloy steel, depending on the production standard and process requirements.
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Possibilities |
Description |
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Low carbon steel |
In most cases, SGH440+Z uses low carbon steel (carbon content ≤ 0.15%) as the base to ensure good formability and weldability. |
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Microalloyed steel |
Some high-strength versions may add trace alloying elements (such as Nb, V, Ti) to improve strength through fine grain strengthening (still in the low carbon category). |
SGH440+Z galvanized steel used in the automotive field?
SGH440+Z is a high-strength hot-dip galvanized steel sheet. With its excellent strength, corrosion resistance and formability, it is widely used in key components in automobile manufacturing that require both safety and lightweight.
With a tensile strength of ≥440 MPa, it can achieve lightweighting (weight reduction of 10%~20%), improve fuel efficiency or the endurance of electric vehicles; the surface galvanizing + passivation has corrosion resistance far exceeding that of ordinary steel, and is suitable for corrosion-prone areas such as the chassis.
