S250GD ZM Structural And Constructional Steel Coil

Gnee Steel (Tianjin) Co., Ltd. is one of the most reliable manufacturers and suppliers of s250gd zm structural and constructional steel coil in China. Welcome to wholesale customized s250gd zm structural and constructional 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.

 

 

S250GD+ZM is a premium hot-dip zinc-magnesium (ZM) alloy-coated structural steel coil engineered to deliver 4–5× higher corrosion resistance than standard galvanized steel, combined with reliable structural strength and excellent processability. Manufactured per EN 10346:2015 standards, this grade features a zinc-magnesium-aluminum (Zn-Mg-Al) coating (1–2% Mg, 1–2% Al) that forms a dense, self-healing protective layer, making it ideal for harsh environments (coastal, industrial, humid) and long-term structural applications.

 

As a core product of GNEE STEEL, S250GD+ZM steel coil balances exceptional durability, cost-effectiveness, and versatility for construction, automotive, appliance, and infrastructure projects.

 

 

S250GD+ZM steel quality: Structural quality for construction

S250GD+ZM steel coating finish:
N (Normal spangle), M (Minimized spangle), R (Regular Zinc-magnesium alloy coating)

S250GD+ZM steel Coil/strip/sheet surface quality:
A (As coated surface), B (Improved surface),C (Best quality surface)

 

S250GD+ZM steel Coil/strip/sheet surface treatment:
C (Chemical passivation),O (oiling), CO(Chemical passivation and oiling), S ( Seales), P(Phosphated), U(Untreated)

S250GD+ZM steel Coil/strip/sheet coating mass:ZM060, ZM070, ZM080, ZM090, ZM100, ZM120, ZM130, ZM140, ZM150, (ZM160), (ZM175), (ZM200), (ZM250), (ZM300), (ZM310), (ZM350), (ZM430),

S250GD+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 S250GD+ZM steel suitable size: Thickness 0.3mm-3.0mm

 

 

Grade	Material No.	C	Si	Mn	P	S
S250GD+ZM	1.0242+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
S250GD+ZM	1.0242+ZM	250	330	19

 

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Construction: Metal roofing, wall cladding, structural framing, garage doors, rain gutters, and facade panels.

Automotive: Heat shields, exhaust components, underbody parts, and structural reinforcements.

Appliances: Washing machines, refrigerators, air conditioners, and electrical control cabinets.

Agriculture: Grain bins, barn roofing, and farm equipment housings.

Infrastructure: Highway guardrails, utility poles, culverts, and sound barriers.

 

 

1. What does S250GD+ZM mean?

S: Structural steel; 250: Min. yield strength 250 MPa; GD: Hot-dip coated substrate; +ZM: Zinc-magnesium alloy coating.

 

2. How does S250GD+ZM differ from S250GD+Z (galvanized)?

S250GD+ZM: Zn-Mg-Al coating, 4–5× higher corrosion resistance, better edge protection, self-healing; ideal for harsh environments.

S250GD+Z: Pure Zn coating, lower cost, standard corrosion resistance; suitable for mild environments.

 

3. What is the typical coating weight for S250GD+ZM?

Standard: ZM120–ZM180 g/m²; customizable from ZM60 to ZM275 g/m² based on corrosion protection needs.

 

4. Can S250GD+ZM be used in coastal areas?

Yes. Its high corrosion resistance (1,000+ hours salt spray) withstands saltwater, humidity, and UV exposure; ideal for coastal construction and infrastructure.

 

5. What surface finishes are available?

Regular spangle, minimized spangle, smooth; optional chromate passivation, anti-fingerprint (AFP), or oiled surface for enhanced protection.

 

6. Is S250GD+ZM weldable?

Yes. It offers excellent weldability for common methods (arc, spot, laser); coating near welds self-heals to maintain corrosion resistance.

 

7. What is the minimum order quantity (MOQ)?

MOQ: 25 tons (one coil); small trial orders (5–10 tons) available upon request.

 

8. Do you provide free samples?

Yes. GNEE STEEL offers free 300×300 mm samples; clients only cover shipping costs. Contact us to request samples and technical data sheets.

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