ASTM A924 Standard Specification: The Foundation of Quality for Galvanized Steel
Our ASTM A924 Compliant Galvanized Steel Coils adhere to the “Standard Specification for General Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip Process.”
While specific standards like ASTM A653 or A792 define the coating type, ASTM A924 is the critical quality benchmark that governs the mechanical precision, dimensional tolerances, and testing protocols for all our metallic-coated products. By strictly following ASTM A924/A924M
Bomis Steel ensures that every coil delivered meets the highest global expectations for consistency and reliability.
Testing Protocols & Quality Assurance
Following the ASTM A924 general requirements, every batch of our steel undergoes a rigorous series of standardized tests to ensure compliance:
Mechanical Property Testing: Verification of yield strength, tensile strength, and elongation (as required by the specific base metal grade).
Coating Weight Verification: Utilizing the Triple-Spot Test or Single-Spot Test to ensure the zinc or aluzinc coating is evenly distributed and meets the specified designation (e.g., G90 or AZ150).
Bend Test Performance: Ensuring the metallic coating maintains a metallurgical bond with the steel substrate without flaking or cracking during fabrication.
Surface Finish & Chemical Treatment
ASTM A924 also regulates the general surface conditions and treatments available to prevent storage stains and enhance longevity:
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Chemical Passivation: Application of chromate or chrome-free treatments to inhibit “white rust.”
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Oiling & Dry Conditions: Customizable surface oiling to match your specific lubrication requirements for stamping or forming.
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Spangle Appearance: Precise control over regular, minimized, or zero spangle finishes as per the end-user’s aesthetic and painting needs.
Technical Summary (ASTM A924 Compliance)
| Feature | ASTM A924/A924M Requirements | Bomis Steel Performance |
| Scope | General Requirements for Hot-Dip Coated Steel | Fully Compliant |
| Thickness Tolerance | Per Table 1 (Standard) / Table 2 (Restricted) | High-Precision Control |
| Flatness Standards | Standard or Extra-Flat | Tension Leveled Available |
| Marking & Certification | Heat Number, Grade, Coating Weight | Full MTC Provided |
Product Name | Galvanized Coil |
Main Application | Architecture, Industry |
Width | 600-1500mm |
Zinc coating | 30-275g/m2 |
Delivery time | 20 day |
Payment term | 30%deposit,70% against copy of B/L |
Coil Weight | 3-5mt, Or As Per Customers′ Requests |
ASTM A924 Classification
- Commercial Steel (CS Types A, B, and C),
- Forming Steel (FS Types A and B),
- Deep drawing steel (DDS),
- Extra deep drawing steel (EDDS),
- Structural steel (SS),
- High strength low alloy steel (HSLAS Type A), and
- High strength low alloy steel (HSLAS Type B).
Certification
Factory services
product display
Frequently Asked Questions
1.What is the difference between ASTM A653 and ASTM A924?
ASTM A924 covers the general requirements (tolerances, testing, and dimensions) for hot-dip galvanized steel, while ASTM A653 specifies the material qualities (commercial, drawing, structural). They are usually cited together.
2.What dimensions are available for A924 compliant coils?
We provide ASTM A924 coils in thicknesses from 0.12mm to 4.0mm and widths up to 1500mm, all meeting strict dimensional tolerance standards.
3.Are you a manufacturer or a trading company?
We are a factory with over 10 years of sales experience
4.How do you guarantee the quality?
1) Sourcing only from top-tier, certified mills.
2) Conducting our own rigorous in-house QC checks.
3) Providing a formal Mill Test Certificate and our quality warranty for every shipment.
