IS 18385: 2023
Steel and Iron - Hot- Dip galvanized/ galvannealed Steel Sheet and strips for Automotive Applications
Summry
Hot-dip galvanized and galvannealed steel sheets and strips are coated steel products used in automotive applications to protect against corrosion. Galvanized steel has a zinc coating, while galvannealed steel is heat-treated after galvanizing for better paintability, weldability, and durability in vehicle body components.
Why BIS Certificate is Mandatory for Hot- Dip galvanized/ galvannealed Steel Sheet and strips for Automotive Applications
BIS certification is mandatory to ensure automotive steel sheets meet Indian Standards for coating weight, corrosion resistance, mechanical strength, and surface quality. Certified steel ensures vehicle safety, long service life, and consistent performance while preventing the use of inferior materials in critical automotive structural and body applications
What is BIS Certified for Hot- Dip galvanized/ galvannealed Steel Sheet and strips for Automotive Applications
The BIS certified specification for hot-dip galvanized and galvannealed steel sheets defines requirements for base steel composition, zinc or zinc-iron coating mass, adhesion, surface finish, mechanical properties, testing methods, and dimensional tolerances. Compliance ensures suitability for automotive manufacturing and long-term corrosion protection.
Test required for Hot- Dip galvanized/ galvannealed Steel Sheet and strips for Automotive Applications
| Title | Mandatory/Optional |
|---|---|
| Surface Finish | Required |
| Non-Ageing Characteristics | Optional |
| Zinc and zinc alloy ingots | Optional |
| Ladle Analysis | Required |
| Product Analysis | Required |
| Tensile Test | Required |
| Plastic Strain Ratio (r-bar/r90) | Required |
| Tensile Strain Hardening Component (nvalue) | Required |
| Bake Hardening Index — (BH) | Required |
| Hole Expansion Ratio — (HER) | Required |
| Optional | Required |
| Coating Mass | Required |
| Coating Adherence | Required |
| DIMENSIONS, SHAPE AND TOLERANCES | Required |
| FREEDOM FROM DEFECTS | 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 galvanized/ galvannealed Steel Sheet and strips for Automotive Applications
1. Enhanced Corrosion Protection
BIS certification ensures the steel has the correct zinc or zinc-iron coating thickness and uniformity, providing long-lasting protection against rust and environmental damage in automotive use.
2. Assured Automotive-Grade Quality
Certified steel meets strict requirements for strength, formability, weldability, and surface finish, ensuring reliable performance in vehicle body panels and structural components.
3. Improved Vehicle Safety and Durability
BIS-approved steel contributes to stronger vehicle structures, better crash resistance, and extended vehicle life, supporting overall automotive safety standards.
4. Mandatory Legal Compliance
BIS certification is compulsory in India for automotive steel, allowing manufacturers and importers to sell products legally and avoid penalties or rejection by OEMs.
5. Increased OEM and Market Acceptance
BIS-certified steel gains higher acceptance among automobile manufacturers, improves brand credibility, and supports participation in government and large-scale automotive supply chains.