Galvanized Structural Steel - ASTM Certified Manufacturer

Zhonghe Building Materials Co., Ltd.

Verified Custom manufacturer · 3 yrs ·

China

galvanized structural steel for construction

Customizable Rock-bottom price

$712 1-49 ton Base price

$681 50-99 ton 4.4% off

$665 ≥100 ton 6.6% 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$ 712.00

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 Structural Steel for Construction

Property	Parameter	Description
Product Name	Galvanized Structural Steel for Construction	Hot-dip or electro-galvanized structural steel sections and plates used in building and civil engineering
Material Grade	S235JR / S355JR / A36 / A572 Gr.50 / Q235B / Q355B	International equivalents: EN 10025 (S235/S355), ASTM A36/A572, GB/T 1591 (Q355B)
Standard Compliance	ASTM A123 / EN ISO 1461 / GB/T 13912 / JIS H 8641	Governs hot-dip galvanizing coating thickness and adhesion requirements for structural steel
Chemical Composition (C)	≤ 0.20% (S235) / ≤ 0.23% (S355)	Low carbon content ensures good weldability and galvanizing compatibility
Chemical Composition (Mn)	≤ 1.50%	Manganese enhances strength and toughness of the base steel
Chemical Composition (P / S)	P ≤ 0.035% / S ≤ 0.035%	Controlled phosphorus and sulfur minimize brittleness and improve coating adhesion
Chemical Composition (Si)	≤ 0.50%	Silicon content managed to avoid Sandelin effect during hot-dip galvanizing
Tensile Strength	360–510 MPa (S235) / 470–630 MPa (S355)	Per EN 10025-2; ASTM A36: 400–550 MPa; suitable for load-bearing structural applications
Yield Strength	≥ 235 MPa (S235) / ≥ 355 MPa (S355)	Minimum yield strength at thickness ≤ 16 mm per EN 10025-2; ASTM A36: ≥ 250 MPa
Elongation	≥ 26% (S235) / ≥ 22% (S355)	Measured on gauge length L0 = 5.65√S0; ensures ductility for seismic and dynamic loads
Zinc Coating Thickness	45–85 μm (average) / ≥ 35 μm (local min.)	Per ASTM A123 / EN ISO 1461; coating mass typically 305–610 g/m²; provides 20–50 years corrosion protection
Dimension Range	Thickness: 3–100 mm; Width: 100–3000 mm; Length: 3000–12000 mm	Available in I-beam, H-beam, angle, channel, flat bar, and plate; custom cutting available
Surface Finish	Hot-dip galvanized (HDG) / Electro-galvanized / Galvannealed	Bright spangled or matte finish; uniform zinc layer with no bare spots, blisters, or flux inclusions
Application	Building frames, bridges, transmission towers, industrial platforms, highway guardrails, prefabricated structures	Ideal for outdoor and corrosive environments requiring long-term structural integrity
Certification	ISO 9001 / CE Marking (EN 1090) / Mill Test Certificate (EN 10204 3.1/3.2)	Third-party inspection by SGS, BV, TÜV available upon request
Packaging	Steel-banded bundles with wooden dunnage; waterproof wrapping for export	Bundle weight typically 2–5 MT; sea-worthy packing per ISPM 15 for international shipment
MOQ	5 MT per size / 25 MT per order	Mixed specifications accepted; OEM and custom fabrication available for large projects

Galvanized Structural Steel - ASTM Certified Manufacturer

Galvanized structural steel for construction stands as one of the most dependable materials in modern civil and industrial building projects, combining the load-bearing strength of structural steel with the outstanding anti-corrosion properties of a hot-dip zinc coating. Produced to meet ASTM A123 and ASTM A36 standards, our galvanized structural steel delivers a zinc coating thickness of 45–85 µm, forming a metallurgically bonded barrier that protects against moisture, salt spray, and atmospheric oxidation for service lifespans exceeding 50 years in moderate environments. From warehouse frames and bridge trusses to transmission towers and residential steel framing, this material finds extensive application across sectors where structural integrity and long-term durability are non-negotiable. As a certified mill-direct manufacturer, we supply I-beams, H-beams, channels, angles, and hollow sections in galvanized finish, enabling project teams to source complete structural packages under a single quality-assured supply chain. Whether your project demands standard profiles or custom-cut lengths, our engineering team is ready to support your specifications from design stage through final delivery.

What is Galvanized Structural Steel for Construction?

Galvanized structural steel for construction refers to carbon or low-alloy steel sections—such as wide-flange beams, angles, channels, and tubular profiles—that have been immersed in a molten zinc bath at approximately 450°C through the hot-dip galvanizing process. The resulting zinc-iron alloy layers provide cathodic protection, meaning the zinc sacrificially corrodes to shield the underlying steel even when the coating is scratched or mechanically damaged, making it the preferred choice for exposed structural applications worldwide.

Galvanized Structural Steel Technical Specifications

Our galvanized structural steel for construction is manufactured and tested against internationally recognized standards to ensure consistent mechanical performance and coating integrity across every batch.

Parameter	Specification
Base Material Standard	ASTM A36 / EN S275JR / GB Q235B
Galvanizing Standard	ASTM A123 / ISO 1461
Yield Strength	≥ 250 MPa (ASTM A36)
Tensile Strength	400–550 MPa minimum
Elongation	≥ 20% in 200 mm gauge length
Zinc Coating Thickness	45–85 µm (average), per ASTM A123 Table 1
Zinc Coating Mass	≥ 325 g/m² for structural sections > 6 mm thick
Steel Density	7.85 g/cm³ at 20°C
Available Profiles	I-beam, H-beam, UB/UC, angle, channel, RHS, SHS, CHS
Length Range	6 m – 18 m standard; custom cutting available
Surface Finish	Hot-dip galvanized, spangled or minimized spangle
Corrosion Category	C3–C4 per ISO 9223 without additional coating

All sections undergo pre-shipment dimensional inspection per ASTM A6/A6M tolerances, and third-party mill test reports (MTRs) are provided with every order, documenting heat number traceability, chemical composition, and mechanical test results.

Get a Competitive Quote for Galvanized Structural Steel

Partner with a trusted ASTM certified manufacturer for your galvanized structural steel for construction needs and benefit from mill-direct rates, verified quality documentation, and dedicated project support. Submit your profile list, quantity, and delivery timeline today to receive a tailored quotation within 24 hours.

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Ratings & Reviews

4.5

Based on 8 reviews

5 5

4 2

3 1

2 0

1 0

Sarah Donovan

Australia

2025-01-13

Quality is there — early shipment had a surface finish inconsistency, now resolved

Ordered 40 tonnes of galvanized angle (L90×90×9) and channel sections for agricultural shed framing in Queensland. First shipment had visible uncoated spots on roughly 3% of angle pieces — likely flux inclusions during galvanizing. Raised the issue immediately; supplier arranged replacement pieces and issued a corrective action report within one week, citing a bath contamination event that has since been rectified. Second and third deliveries were clean, coating mass confirmed above 325 g/m². MTRs and ASTM A36 mechanical data were always accurate. Appreciate the responsive handling — will continue cautiously with closer incoming inspection.

Mohammed Al Rashidi

UAE

2025-02-04

Competitive pricing for galvanized sections in Gulf C4/C5 environment

Sourced galvanized RHS 200×100×8 and SHS 150×150×6 sections, 70 tonnes, for a logistics warehouse structure near Dubai. The hot-dip galvanized finish with zinc coating ≥ 45 µm provides adequate protection for our coastal industrial zone, classified C4 per ISO 9223. Pricing was competitive versus regional distributors, and lead time to Jebel Ali port was 35 days. Technical team confirmed corrosion category suitability for our environment without requiring additional paint system — that saved budget. Knocked one star only because the initial freight quote took slightly longer than the advertised 24-hour window. Overall satisfied.

Thomas Barclay

United Kingdom

2025-02-26

Good value on galvanized UB sections — minor documentation delay noted

Ordered 50 tonnes of galvanized UB 254×146 and UC 203×203 sections for a footbridge project in Leeds, requiring ASTM A123 and ISO 1461 dual certification. Product quality was strong — coating thickness measured 62–78 µm on our end, tensile strength within 400–550 MPa range as stated. Only issue was that final MTRs arrived two days after the shipment notification rather than simultaneously, which created a brief hold at our site. Supplier acknowledged the process gap and resolved it. Price per tonne was 8% below our previous UK supplier. Would order again with the documentation timing clarified upfront.

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.