SGH540 galvanized steel coil is used for?
Automobile manufacturing field
Safety structural parts: anti-collision beams, B-pillar reinforcement plates, door anti-collision bars
Advantages: more than 25% lighter than traditional materials, meeting C-NCAP five-star collision standards
Chassis system: battery pack housing, subframe
Buildings and infrastructure
Assembled steel structure: beam and column components (3.0-6.0mm), 30% lighter than Q355B, 50% higher installation efficiency
Photovoltaic support system: 1.5mm SGH540+ZM80, 30-year anti-corrosion design
Wind pressure resistance ≥0.6kN/m² (C5 environment)
Engineering machinery field
Typical components: boom segments of cranes, harvester granaries of agricultural machinery
What is the material of high strength SGH540 galvanized steel?
SGH540 is a low alloy high strength hot dip galvanized steel (HSLA), made by cold rolled base plate + hot dip galvanizing process, which has both structural strength and corrosion resistance.
SGH: Steel Grade High-strength (high-strength steel grade)
540: minimum tensile strength 540MPa
+Z: hot-dip galvanized (Zinc Coated)
Material composition
|
element |
Content range |
Mechanism of action |
|
C |
≤0.12% |
Ensure weldability and reduce the risk of cold cracking |
|
Mn |
1.0-1.8% |
Main element for solid solution strengthening |
|
P |
≤0.025% |
Strict control (affects toughness) |
|
S |
≤0.015% |
Strict control (leads to hot brittleness) |
|
Nb/Ti |
0.02-0.08% |
Grain refinement + precipitation strengthening |
|
Al |
0.015-0.06% |
Deoxidation, grain refinement |
High strength SGH540 steel coil equivalent to?
|
Standard system |
Direct Equivalent Grade |
Approximate alternative grades |
Differences |
|
China (GB) |
HC550/650D+Z |
HC620D+Z |
The national standard strength classification is more detailed |
|
Europe (EN) |
HX540LAD+Z |
HX420LAD+Z |
European standards have stricter requirements on Nb/Ti content |
|
USA (ASTM) |
ASTM A653 SS550 |
ASTM A792 Grade 550 |
Different classifications of American standard coatings |
|
Japan (JIS) |
SAPH540+Z |
SAPH590+Z |
Japanese elongation is slightly higher |
|
International ISO |
HD540LAD+Z |
HD620LAD+Z |
ISO standards are widely used |
Completely equivalent replacement
Automotive industry: HX540LAD+Z (European standard) or HC550D+Z (national standard) are preferred
Export projects: SS550 is used for American standard projects, and the difference in elongation should be noted
What are the differences between SGH540 galvanized steel and HX540LAD+Z?
There are differences in plating and surface treatment
|
Features |
SGH540 |
HX540LAD+Z |
|
Coating process |
Traditional hot-dip galvanizing |
Environmentally friendly passivation (chrome-free treatment) |
|
Coating control accuracy |
±10% |
±7% |
|
Surface roughness |
Ra 1.2-1.6μm |
Ra 0.8-1.2μm |
|
Zinc flower morphology |
Conventional zinc spangles |
Zero Spangle |
|
Anti-fingerprint treatment |
Optional |
Default standard |
Selection suggestions
HX540LAD+Z is preferred:
✅ High surface quality requirements (such as home appliance panels)
✅ Compliance with EU environmental regulations
✅ Complex stamping parts
SGH540 is preferred:
✅ Cost-sensitive projects
✅ Japan and South Korea supply chain system
✅ Simple bending/welding parts