When sourcing high-performance coated steel for roofing, cladding, or industrial fabrication, the JIS G3321 galvalume steel sheet standard is the benchmark for quality and durability. This Japanese Industrial Standard governs hot-dip 55% aluminum-zinc alloy-coated steel sheet and coil, commonly known as aluzinc or galvalume. At ChinaCNU Steel, we supply JIS G3321 galvalume steel sheet from our ISO-certified Qingdao factory, offering FOB pricing, MOQ 25 tons, and 15+ years of export experience to 80+ countries. Our AZ150 galvalume coils meet the strictest corrosion resistance and formability requirements for metal roofing coil applications worldwide.
What Is JIS G3321 Galvalume Steel Sheet?
JIS G3321 defines the specifications for hot-dip 55% aluminum-zinc alloy-coated steel sheet and coil. This coating, often called aluzinc, provides superior corrosion resistance compared to traditional hot-dip galvanized steel. The standard covers multiple grades, including SGLCC, SGLCD, and SGLCE, each with specific mechanical properties for bending, forming, and structural use. The AZ150 designation refers to the coating weight of 150 g/m² (total both sides), which is the most common specification for exterior building materials like roofing and siding. As a galvalume supplier China, we ensure every coil meets the chemical composition limits for aluminum, zinc, and silicon, guaranteeing consistent performance in aggressive environments.
Jis G3321 Galvalume Steel Sheet Price Trend (USD/Ton) – Last 12 Months
Data: ChinaCNU Steel Market Research | FOB Tianjin Reference Price
Key Benefits of AZ150 Galvalume Coating
The 55% aluminum-zinc coating creates a barrier that is 2–4 times more corrosion-resistant than standard galvanized steel. This makes JIS G3321 galvalume steel sheet ideal for agricultural buildings, industrial warehouses, and residential roofing in coastal or industrial zones. The coating also offers excellent heat reflectivity, reducing cooling costs in warm climates. Our aluzinc steel coil is produced with tight thickness tolerances (±0.02 mm for 0.3–0.8 mm thickness) and superior surface quality, ensuring no spangle or minimal spangle finishes as required by the standard.
JIS G3321 Grades and Mechanical Properties
Understanding the grade designation is critical when selecting the right JIS G3321 galvalume steel sheet for your project. Below is a comparison table of common grades and their typical applications:
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Typical Application |
|---|---|---|---|---|
| SGLCC | 270–500 | ≥ 380 | ≥ 18 | General forming, roofing, siding |
| SGLCD | 270–440 | ≥ 360 | ≥ 22 | Deep drawing, complex profiles |
| SGLCE | 270–410 | ≥ 340 | ≥ 26 | Severe forming, automotive parts |
| SGLCC AZ150 | 270–500 | ≥ 380 | ≥ 18 | Metal roofing coil, industrial panels |
For most construction applications, SGLCC with AZ150 coating is the standard choice. Our factory produces all grades with full traceability, and each coil is tested for coating weight, adhesion, and bend performance per JIS G3321:2019. We also offer custom slitting to width, so you receive exactly the metal roofing coil width you need—from 600 mm to 1250 mm.
Why Choose ChinaCNU Steel as Your Galvalume Supplier China?
With over 15 years in the steel export business, ChinaCNU Steel has shipped more than 500,000 tons of JIS G3321 galvalume steel sheet to 80+ countries. Our Qingdao factory operates three continuous hot-dip coating lines with annual capacity exceeding 300,000 tons. Every coil is ISO 9001 and ISO 14001 certified, ensuring consistent quality and environmental compliance. We understand that FOB pricing and reliable lead times matter to our clients—that is why we maintain a 25-ton MOQ that suits both small contractors and large distributors.
Quality Control and Testing
Before shipment, each batch of aluzinc steel coil undergoes rigorous testing: coating weight analysis by X-ray fluorescence, T-bend adhesion tests, and salt spray corrosion testing per ASTM B117. Our in-house lab is accredited to perform these tests, and we provide mill test certificates with every order. This level of quality assurance is why architects and engineers specify our JIS G3321 galvalume steel sheet for critical structures like airport hangars, cold storage facilities, and solar panel mounting systems.
Applications of JIS G3321 Galvalume Steel Sheet in 2026
The construction industry continues to demand materials that offer long service life with minimal maintenance. In 2026, JIS G3321 galvalume steel sheet is the material of choice for:
- Metal roofing and wall cladding – AZ150 coating provides 25+ year corrosion protection in most environments.
- Agricultural buildings – Barns, poultry houses, and grain silos benefit from the heat reflectivity and chemical resistance.
- Industrial insulation panels – Sandwich panels with PIR or EPS cores rely on galvalume facing for durability.
- Automotive components – SGLCD and SGLCE grades are used in exhaust systems and heat shields.
- Solar energy structures – Ground-mount and roof-mount racking systems use aluzinc steel for corrosion resistance.
Our clients in Southeast Asia, Africa, and the Middle East particularly value the combination of FOB pricing and high corrosion resistance in humid and salty environments. We also supply prepainted versions (color-coated) for architectural aesthetics, all based on the same JIS G3321 galvalume base substrate.
FOB Pricing and MOQ for Galvalume Coils
We offer competitive FOB Tianjin pricing for JIS G3321 galvalume steel sheet. Prices vary by grade, coating weight, thickness, and order quantity. Our standard MOQ is 25 tons per size and specification, which allows us to maintain efficient production and pass cost savings to you. For larger orders—100 tons or more—we can offer additional volume discounts. Typical thickness range is 0.2 mm to 2.0 mm, with width up to 1250 mm. All coils are packed for sea freight with waterproof paper, steel strapping, and edge protection.
How to Order
Simply send us your required dimensions (thickness, width, coil ID), grade, coating weight (AZ150 or other), and quantity. We will respond within 24 hours with a confirmed FOB price, production lead time (usually 15–20 days), and shipping schedule. Our export team handles all documentation, including bill of lading, packing list, and certificate of origin.
Frequently Asked Questions
Q1: What is the difference between JIS G3321 and ASTM A792?
A: JIS G3321 is the Japanese standard for 55% Al-Zn coated steel, while ASTM A792 is the US equivalent. Both specify similar coating composition and mechanical properties, but JIS G3321 includes more grade options for forming (SGLCD, SGLCE). Our JIS G3321 galvalume steel sheet meets both standards in most cases.
Q2: Can you supply JIS G3321 galvalume sheet with AZ150 coating in 0.5 mm thickness?
A: Yes. 0.5 mm thickness with AZ150 coating is our most popular specification for metal roofing coil. We supply it in widths from 900 mm to 1250 mm, slit to your exact requirement. MOQ is 25 tons per width.
Q3: How does the AZ150 coating compare to AZ100 or AZ200?
A: AZ150 (150 g/m² total) offers a balanced combination of corrosion resistance and formability. AZ100 is lighter and less expensive but provides shorter service life. AZ200 offers maximum corrosion protection for extreme environments. For most roofing applications, AZ150 is the industry standard.
Q4: What is the typical lead time for FOB orders from Qingdao?
A: For standard grades and sizes, production takes 15–20 working days after confirmation. Sea freight to major ports (e.g., Singapore, Dubai, Lagos) takes 15–30 days. We can also arrange express delivery for sample orders of 1–2 tons.
Q5: Do you provide third-party inspection certificates?
A: Yes. We welcome inspection by SGS, Bureau Veritas, or any accredited third-party agency. Our ISO-certified factory has a dedicated quality team to facilitate inspections. We also provide mill test certificates with every shipment.
Ready to order JIS G3321 galvalume steel sheet at competitive FOB pricing? Contact our export team today for a quote, mill certificate, or technical datasheet. With 15+ years of experience and ISO certification, ChinaCNU Steel is your trusted galvalume supplier China.
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