S550GD ZM100 ZM120 ZM150 Galvanized Steel Coil

Gnee Steel (Tianjin) Co., Ltd. is one of the most reliable manufacturers and suppliers of s550gd zm100 zm120 zm150 galvanized steel coil in China. Welcome to wholesale customized s550gd zm100 zm120 zm150 galvanized steel coil at low price from our factory. If you have any enquiry about free sample and cheap products, please feel free to email us.

 

 

S550GD Zinc Aluminum Magnesium Steel Coil is GNEE STEEL's high-end high-strength structural product, engineered with premium Zn-Al-Mg (ZM) alloy coating and strictly compliant with EN 10346:2015 standards.

Let's clarify the meaning of three common ZM coating thicknesses for S550GD: ZM100, ZM120, and ZM150 - the numbers represent the total mass of the zinc-aluminum-magnesium coating per square meter of the steel coil surface. Specifically, ZM100 means 100 g/m² coating mass, ZM120 means 120 g/m², and ZM150 means 150 g/m².

The higher the coating mass, the stronger the corrosion resistance and the longer the service life, allowing you to choose the most cost-effective option based on your project's environmental conditions and service requirements. As a core flagship product of GNEE STEEL, S550GD ZM steel coil features a minimum yield strength of 550MPa, exceptional structural bearing capacity, and the unique self-healing anti-rust performance of ZM coating, making it the first choice for heavy-duty, high-load, and harsh-environment projects worldwide.

 

S550GD+ZM steel quality: Structural quality for construction

S550GD+ZM steel coating finish:
N (Normal spangle), M (Minimized spangle), R (Regular Zinc-magnesium alloy coating)

S550GD+ZM steel Coil/strip/sheet surface quality:
A (As coated surface), B (Improved surface),C (Best quality surface)

 

S550GD+ZM steel Coil/strip/sheet surface treatment:
C (Chemical passivation),O (oiling), CO(Chemical passivation and oiling), S ( Seales), P(Phosphated), U(Untreated)

S550GD+ZM steel Coil/strip/sheet coating mass: ZM060, ZM070, ZM080, ZM090, ZM100, ZM120, ZM130, ZM140, ZM150, (ZM160), (ZM175), (ZM200), (ZM250), (ZM300), (ZM310), (ZM350), (ZM430),

S550GD+ZM steel Coil/strip/sheet coating:Zinc-magnesium alloy (ZM) : application of a zinc-magnesium coating by immersing the prepared strip in a molten bath of zinc-aluminium-magnesium.

EN10346 S550GD+ZM steel suitable size: Thickness 0.3mm-3.0mm

 

 

Grade	Material No.	C	Si	Mn	P	S
S550GD+ZM	1.0531+ZM	0.20	0.60	1.70	0.10	0.045

 

Grade	Material No.	Yield Strength MPa min	Tensile strength MPa min	Elongation A80 min
S550GD+ZM	1.0531+ZM	550	560	-

 

Ask for Sample & Quote

 

 

S550GD ZM steel coil, with its ultra-high strength and customizable ZM coating thickness (ZM100/ZM120/ZM150), is widely used in various high-demand fields:

 

Construction & Steel Structure: Large-span factory buildings, high-rise building frames, heavy-duty purlins, roof and wall cladding for industrial warehouses and stadiums.

Solar Energy Infrastructure: High-load solar photovoltaic (PV) mounting brackets, ground-mounted PV structures, and solar farm support systems (ideal for ZM120/ZM150 in outdoor harsh environments).

Coastal & Infrastructure Engineering: Coastal bridges, port facilities, highway guardrails, and communication towers (ZM150 is recommended for maximum corrosion resistance).

Agriculture & Heavy Industry: Large-scale silos, heavy-duty greenhouse frames, livestock breeding equipment, and industrial equipment shells.

Transportation: Heavy-duty truck chassis parts, container components, and logistics equipment structural parts.

 

 

 

 

Q1: What do S550GD and ZM (ZM100/ZM120/ZM150) stand for?

S = Structural steel; 550 = Minimum yield strength of 550MPa; GD = Hot-dip coated structural steel; ZM = Zinc-aluminum-magnesium alloy coating. ZM100/ZM120/ZM150 represent the coating mass per square meter (100g, 120g, 150g respectively).

 

Q2: How to choose between ZM100, ZM120, and ZM150 for my project?

Choose based on the corrosion environment: ZM100 for general urban/industrial environments (low corrosion); ZM120 for humid, rainy, or mild corrosive environments; ZM150 for coastal, saline-alkali, or high-chemical-corrosion industrial areas (maximum protection).

 

Q3: What is the difference between S550GD+ZM and S420GD+ZM?

S550GD+ZM has a 130MPa higher minimum yield strength (550MPa vs. 420MPa) and better load-bearing capacity, making it suitable for heavier loads, larger spans, and higher strength requirements than S420GD+ZM.

 

Q4: Can S550GD ZM steel coil be bent and deep-processed?

Yes. With a minimum elongation of 12%, it has good formability, supporting bending, stamping, slitting, and profiling. The ZM coating has strong adhesion, so no peeling or cracking will occur during processing.

 

Q5: Is S550GD ZM suitable for coastal marine environments?

Absolutely. The ZM coating (especially ZM150) has excellent salt spray resistance (1800+ hours without red rust) and self-healing properties, effectively resisting corrosion from saltwater and high humidity in coastal areas.

 

Q6: Do you provide samples of S550GD with different ZM coating thicknesses?

Yes. We offer free samples of S550GD with ZM100, ZM120, and ZM150 coatings for your testing (thickness, corrosion resistance, mechanical properties). Contact us to request samples.

 

Q7: What is the lead time for S550GD ZM orders?

Standard specifications (ZM100/ZM120/ZM150, common thickness/width): 7–15 days. Custom specifications (special coating mass, thickness, width): 20–30 days, depending on order quantity.

 

Q8: Does GNEE STEEL provide after-sales technical support?

Yes. Our professional technical team provides 24/7 support, including coating selection guidance, processing tips (bending, welding), and solution to any product-related issues during use.

 

Hot Tags: s550gd zm100 zm120 zm150 galvanized steel coil, China s550gd zm100 zm120 zm150 galvanized steel coil manufacturers, suppliers, factory, galvanized steel strength supplies, galvanized steel producer, galvanized steel specification supplies, galvanized steel reseller, galvanized steel improvement price, galvanized steel advantage price