0.22mm DR8 Chromium Coated Tin Free Steel Sheet for Crown Cap Bottle Closure Production
Product Details
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TFS chrome coated steel,tin free steel sheet,crown cap steel DR8 |
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Product Description
- Chromium/Chromium Oxide Dual Coating: The electrolytic chromium coating consists of a metallic chromium layer (50-100 mg/m²) covered by a chromium oxide hydrate layer (5-20 mg/m² of Cr). This unique dual-layer structure provides exceptional adhesion for organic lacquers, inks, and sealant compounds used in closure manufacturing, achieving bond strengths that exceed traditional tinplate lacquer adhesion.
- Superior Lacquer and Print Adhesion: The chromium oxide surface chemistry creates an ideal substrate for epoxy, polyester, and organosol lacquers commonly applied to crown caps. Unlike tinplate which may require chemical treatment before lacquering, TFS provides direct and consistent adhesion without pre-treatment, reducing production steps and improving line efficiency.
- Exceptional Sulfide Stain Resistance: For closures on food products containing sulfur compounds (such as protein-rich beverages, canned meats, and certain vegetable products), TFS exhibits complete resistance to sulfide staining that can discolor traditional tinplate. This ensures the closure maintains its aesthetic appearance throughout the product shelf life.
- DR8 High-Strength Temper: The double-reduced DR8 temper provides yield strength exceeding 550 MPa, allowing closure manufacturers to use thinner gauge material (0.20-0.24mm) without sacrificing mechanical integrity. This results in material weight reduction of 10-15% compared to single-reduced alternatives, improving both cost efficiency and sustainability metrics.
- Eco-Friendly and Regulatory Compliant: TFS is fully recyclable through standard steel recycling streams with established infrastructure worldwide. The absence of tin in the coating eliminates potential heavy metal concerns in certain regulatory frameworks. The material complies with EU, FDA, and other international food contact regulations when used with appropriate lacquer systems.
- High-Speed Stamping Compatibility: The consistent mechanical properties and precise gauge control (+/-0.005mm tolerance) across the coil length enable reliable high-speed stamping operations at rates exceeding 2,000 closures per minute. The uniform chromium coating provides consistent tool wear characteristics, extending die life and reducing production downtime.
| Parameter | Specification |
|---|---|
| Material Type | Tin Free Steel (ECCS/TFS) |
| Steel Grade | MR (Medium Rigidity) Low-Carbon Steel |
| Metallic Chromium Coating | 50-100 mg/m² per side |
| Chromium Oxide Coating | 5-20 mg/m² (as Cr) per side |
| Thickness | 0.20mm - 0.24mm (Standard Crown Cap Gauge) |
| Width Range | 600mm - 1050mm |
| Temper (Hardness) | DR8 (TH550), DR7.5, DR9 Available |
| Yield Strength (DR8) | 550 MPa minimum |
| Surface Finish | Matte, Bright, Stone |
| Applicable Standards | JIS G3315, ASTM A657/A657M, EN 10202, GB/T 24180 |
| Oiling | Dioctyl Sebacate (DOS) or Acetyl Tributyl Citrate (ATBC) |
| Form Available | Coil or Cut-to-Length Sheet |
This TFS chrome coated steel is specifically engineered for the closure and cap manufacturing industry. Primary applications include crown corks for glass beverage bottles (beer, carbonated soft drinks, mineral water), twist-off lug caps for jarred food products (jams, sauces, pickled vegetables), continuous thread (CT) caps for spirits and liquor bottles, pry-off caps for pharmaceutical and nutraceutical containers, and specialty closures for cosmetic and personal care packaging. The material is also increasingly specified by beverage brands transitioning to more sustainable packaging options, as the elimination of tin coating aligns with corporate sustainability targets while maintaining full recyclability through established steel recovery infrastructure.
All TFS coils and sheets are packaged with interleaving paper between wraps to prevent surface abrasion, wrapped with VCI (Volatile Corrosion Inhibitor) paper for rust protection during transit, secured with steel edge protectors and high-tension strapping, and mounted on heat-treated fumigated wooden pallets suitable for containerized shipping.
Quality control includes online chromium coating weight measurement via X-ray fluorescence, mechanical property verification per ASTM A657, surface roughness measurement using stylus profilometry, lacquer adhesion testing (cross-hatch and Erichsen cupping), and continuous surface inspection for coating defects. Full traceability from heat number to final coil is maintained throughout the production process.
Product Highlights
Tin Free Steel (TFS) with electrolytic chromium/chromium oxide coating, specifically engineered for crown cap and bottle closure manufacturing. DR8 double-reduced temper delivers the high strength and precision gauge control required for high-speed closure stamping operations.
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