Galvanized Steel Coils - ASTM Certified Manufacturer

Zhonghe Building Materials Co., Ltd.

Verified Custom manufacturer · 3 yrs ·

China

Customizable Rock-bottom price

$520 1-49 ton Base price

$497 50-99 ton 4.4% off

$486 ≥100 ton 6.5% off

Price validity: subject to market conditions

Supplier's customization ability

Drawing-based customization
Sample-based customization
Full customization

Quantity

Minimum order quantity: 1 ton

Shipping total: To be negotiated

Subtotal of goods US$ 520.00

Start order request

Payment and delivery

Payment:: by contract — deposit, balance after your inspection
Lead time:: confirmed with the quotation
Packaging:: standard export packing
Samples:: available on request

Product details

Technical Specifications of Galvanized Steel Coils for Construction

Property	Parameter	Description
Product Name	Galvanized Steel Coils for Construction	Hot-dip or electro-galvanized steel coils designed for structural and construction applications
Material Grade	DX51D, DX52D, DX53D / S220GD, S250GD, S280GD, S320GD, S350GD	Equivalent to ASTM A653 CS Type A/B/C, SS Grade 33/37/40/50; JIS G3302 SGCC/SGCD
Standard Compliance	ASTM A653/A653M, EN 10346, JIS G3302, GB/T 2518	Meets international standards for hot-dip zinc-coated steel sheet and strip
Chemical Composition	C ≤ 0.12%, Mn ≤ 0.60%, P ≤ 0.10%, S ≤ 0.045%, Si ≤ 0.50%	Low-carbon steel base; composition varies by grade per EN 10346 / ASTM A653
Tensile Strength	270–560 MPa	DX51D: ≥270 MPa; S350GD: ≥420 MPa; per EN 10346 / ASTM A653
Yield Strength	140–420 MPa	S220GD: ≥220 MPa; S350GD: ≥350 MPa; structural grades per EN 10346
Elongation	≥16%–26%	DX51D: ≥22%; S350GD: ≥16%; measured on A80 gauge per EN 10346
Zinc Coating Weight	Z60–Z600 (g/m²); AZ50–AZ150 (Galvalume)	Both sides combined; Z275 (275 g/m²) most common for construction; per ASTM A653 G30–G235
Thickness Range	0.12–6.00 mm	Standard construction range: 0.3–3.0 mm; tolerance per EN 10143 or ASTM A924
Width Range	600–1,500 mm	Custom slit widths available; standard coil width 914 mm, 1,000 mm, 1,219 mm, 1,250 mm
Coil Inner Diameter	508 mm / 610 mm	Standard inner diameter; coil weight typically 3–25 MT per coil
Surface Finish	Regular Spangle, Minimized Spangle, Zero Spangle, Skin-passed	Chromate passivation or oiled surface available; smooth finish suitable for roll-forming and profiling
Application	Roofing sheets, wall cladding, purlins, steel frames, corrugated panels, HVAC ducts, structural profiles	Widely used in residential, commercial, and industrial construction projects
Certification	ISO 9001, CE Marking, Mill Test Certificate (EN 10204 3.1/3.2), SGS, BV	Third-party inspection available; full traceability documentation provided
Packaging	Eye-to-sky or eye-to-wall coil packaging; steel strip banding; waterproof paper + steel outer wrap	Suitable for sea freight, rail, and road transport; fumigation-free wooden pallet optional
MOQ	25 MT per order	Mixed grades and specifications accepted; spot stock available for standard grades

Galvanized Steel Coils - ASTM Certified Manufacturer

Galvanized Steel Coils for Construction represent one of the most critical structural materials in modern infrastructure development, offering a superior combination of mechanical strength and long-term corrosion protection. Engineered to meet rigorous ASTM A653 and A924 standards, these coils serve critical roles in roofing systems, wall cladding, structural framing, and load-bearing assemblies across residential, commercial, and industrial building projects. The hot-dip galvanizing process bonds a metallurgically alloyed zinc coating to the base steel substrate, delivering a minimum coating weight of Z275 (275 g/m²) that shields the material against moisture, chemical exposure, and atmospheric oxidation for decades. With a tensile strength range of 270–550 MPa and yield strength starting at 140 MPa per ASTM A653, these coils provide the structural reliability that construction engineers and contractors demand. Whether you are sourcing material for large-scale civil engineering projects or prefabricated building components, our ASTM-certified galvanized steel coils deliver consistent performance at mill-direct rates.

What are Galvanized Steel Coils for Construction?

Galvanized Steel Coils for Construction are cold-rolled or hot-rolled steel strips coated with a protective zinc layer through a continuous hot-dip galvanizing process. The zinc coating, typically ranging from Z100 to Z600 (100–600 g/m²), forms a metallurgical bond with the steel base, providing outstanding anti-corrosion properties essential for structural and architectural construction applications. These coils conform to ASTM A653, JIS G3302, and EN 10346 international standards.

Galvanized Steel Coils for Construction supplier

Galvanized Steel Coils for Construction Manufacturing Process

Production begins with premium-grade cold-rolled steel substrate, which undergoes continuous annealing to restore ductility. The strip then passes through a molten zinc bath maintained at approximately 450–460°C, where the zinc-iron alloy layer forms through diffusion bonding. Air-knife wiping precisely controls coating thickness, followed by skin-pass rolling to achieve the required surface finish—either regular spangle, minimized spangle, or zero spangle—before coiling and inspection.

Galvanized Steel Coils for Construction Technical Specifications

Our galvanized steel coils are manufactured to the following verified parameters:

Galvanized Steel Coils for Construction manufacturer

Base Material: Low-carbon or high-strength low-alloy (HSLA) steel
Thickness: 0.12–6.0 mm
Width: 600–1,550 mm
Zinc Coating Weight: Z100–Z600 (100–600 g/m²) per ASTM A653
Tensile Strength: 270–550 MPa (Grade CS to SS Grade 80)
Yield Strength: 140–550 MPa depending on grade
Elongation: ≥20% (A50 gauge) for structural grades
Surface Finish: Regular spangle, minimized spangle, zero spangle, or skin-passed
Standards: ASTM A653/A924, JIS G3302, EN 10346, GB/T 2518
Coil Weight: 3–25 MT per coil

All coils undergo mill certification testing including salt-spray resistance validation exceeding 500 hours per ASTM B117, ensuring long-term durability in demanding construction environments.

Get a Competitive Quote for Galvanized Steel Coils

Partner with an ASTM-certified manufacturer offering mill-direct pricing, rigorous quality control, and fast global delivery. Our technical team is ready to help you select the optimal grade, coating weight, and dimensions for your specific construction application—ensuring compliance and cost efficiency from the first order.

24/7 customer support available
Free samples for quality evaluation
Competitive pricing for bulk orders
Professional technical consultation

Contact us today to get your free quote within 24 hours!

Galvanized Steel Coils for Construction wholesale

Ratings & Reviews

4.5

Based on 8 reviews

5 5

4 2

3 1

2 0

1 0

Thomas Bergman

United States

2025-02-02

Initial width tolerance issue — resolved promptly by supplier

Our first order of 50 MT of 1.0mm Z350 coils, width 1,250mm per ASTM A653, arrived with two coils measuring 1,238mm — outside our ±3mm tolerance for our roll-forming line. We raised the issue immediately. The supplier responded within 4 hours, issued a formal non-conformance report, and arranged replacement coils plus a partial credit within 10 days. The replacement material was within spec. The resolution process was professional and fast. We have since placed a second order and quality control appears tightened. Cautiously optimistic going forward.

Priya Sharma

Australia

2025-02-24

Competitive pricing on ASTM/AS-compliant coils for Queensland projects

Ordered 90 MT of 0.6mm Z275 galvanized coils for roofing sheet fabrication serving Queensland residential builds. The coils met ASTM A653 and were cross-referenced against AS 1397 G300 Z275 requirements — coating and mechanical properties aligned well. Price per MT was approximately 8% below our previous supplier for the same spec. Delivery to Brisbane took 26 days which was slightly longer than quoted, but we were informed of the delay in advance. Surface quality and coil geometry were good with no edge wave issues during slitting.

Kevin Hartley

United States

2025-03-18

Good value on bulk order — minor documentation delay

Placed an order for 200 MT of 1.2mm Z275 coils, Grade CS Type B per ASTM A653, for distribution to residential contractors across Texas. Product quality was solid — elongation tested at 24% which is above the 20% minimum, and surface finish was clean with regular spangle. Pricing was noticeably better than domestic US mill quotes for equivalent spec. Only minor issue was a two-day delay receiving the full mill cert package, though it arrived before the vessel departed. Overall good value for the specification and volume.

Know your supplier

Zhonghe Building Materials Co., Ltd.

3 yrs on Sinoali.com

Located in China

Company information More goods

FAQ

Q: What is the zinc coating weight of your galvanized steel?

A: Common zinc coating includes Z60, Z80, Z100, Z120, Z180, Z275, and we can also provide custom coating as required.

Q: What types of galvanized steel do you supply for construction?

Q: What is the difference between GI and PPGI?

Q: Do you offer customized sizes and lengths?

Q: How do you package galvanized steel to prevent rust during shipment?

Q: Can you provide mill test certificates (MTC) for galvanized steel?

Product display

Zhonghe Building Materials Co., Ltd. is a professional industrial manufacturer and supplier focusing on high-quality building materials. We specialize in a full range of steel building materials, covering reinforcing steel bars, galvanized steel products, corrugated steel sheets, structural steel pipes and other related metal construction materials.

Equipped with advanced production lines and precision testing equipment, the company implements strict full-process quality control and holds authoritative industry qualification certificates. We maintain sufficient spot inventory, adopt standardized export packaging, and ensure stable delivery cycles to meet global customer demands.

Our products are widely applied in construction engineering, machinery manufacturing, shipbuilding, energy and infrastructure projects. Adhering to the principle of quality first and customer-oriented service, we are committed to providing reliable building material solutions and long-term stable cooperation for global clients.