IS 18513: 2023
Steel and Iron - Hot-Dip Zinc – Aluminium – Magnesium Alloy Coated Steel Sheets, Plates and Strips
Summry
Hot-Dip Zinc–Aluminium–Magnesium alloy coated steel sheets, plates, and strips are steel products coated with a protective alloy layer of zinc, aluminium, and magnesium. This coating provides superior corrosion resistance, durability, and edge protection, making the steel suitable for construction, automotive, infrastructure, and industrial applications.
Why BIS Certificate is Mandatory for Hot-Dip Zinc – Aluminium – Magnesium Alloy Coated Steel Sheets, Plates and Strips
BIS certification is mandatory to ensure that Zinc–Aluminium–Magnesium alloy coated steel meets Indian safety, quality, and performance standards. It controls coating composition, thickness, corrosion resistance, and mechanical strength. Certification prevents the use of substandard steel, ensures long service life, and protects public infrastructure and consumers.
What is BIS Certified for Hot-Dip Zinc – Aluminium – Magnesium Alloy Coated Steel Sheets, Plates and Strips
The BIS certified specification defines requirements for base steel quality, alloy coating composition, coating mass, adhesion, corrosion resistance, dimensional tolerances, and testing methods. It ensures uniform manufacturing, reliable performance in harsh environments, and compliance with Indian regulatory standards for coated steel products.
Test required for Hot-Dip Zinc – Aluminium – Magnesium Alloy Coated Steel Sheets, Plates and Strips
| Title | Mandatory/Optional |
|---|---|
| Coating bath metal composition | Required |
| Surface Finish | Required |
| Zinc and zinc alloy ingots | Optional |
| Ladle Analysis | Required |
| Product Analysis | Required |
| Coating Mass | Required |
| Coating Adherence | Required |
| Corrosion Resistance for Coating | Required |
| Surface Treatment and Finish | Required |
| Tensile Test | Required |
| Plastic Strain Ratio (r-bar/r90) | Required |
| Tensile Strain Hardening Component (nvalue) | Required |
| Bake Hardening Index — (BH) | Required |
| Optional | Required |
| Optional | Required |
| DIMENSIONS, SHAPE AND TOLERANCES | Required |
| Cracks due to strain ageing | Required |
| Surface treatment | Required |
| COIL BREAKS, STRETCHER STRAINS AND BENDS (KINKS) | Required |
| WELDABILITY | Required |
| MASS | Required |
Benefits of BIS Certification for Hot-Dip Zinc – Aluminium – Magnesium Alloy Coated Steel Sheets, Plates and Strips
1. Assured Corrosion Protection BIS certification ensures the correct zinc–aluminium–magnesium coating composition and thickness, providing superior corrosion resistance even in coastal, industrial, and high-humidity environments.
2. Consistent Product Quality Certified steel sheets, plates, and strips meet strict standards for strength, coating adhesion, and surface finish, ensuring uniform performance across all applications.
3. Longer Service Life BIS-approved products offer enhanced durability and edge protection, reducing maintenance costs and extending the life of structures and components.
4. Legal Compliance in India BIS certification is mandatory for market entry in India, helping manufacturers and importers avoid penalties, rejection, and regulatory complications.
5. Market Trust and Brand Value The BIS mark increases buyer confidence, improves acceptance in government and infrastructure projects, and strengthens brand reputation in domestic and export markets.