Tin free steel sheet

When purchasing TFS (Electrolytic Chromium Coated Steel), you must specify the Steel Grade (typically MR, L, or D type depending on corrosion resistance needs) and Temper Grade (ranging from T1 to T5 or DR7 to DR9 for double-reduced steel). The coating weight is critical, usually requiring a chromium layer of 50–150 mg/m². Additionally, verify the surface finish (Bright, Stone, or Matte) to ensure it meets your specific lacquer adhesion requirements.

TFS is generally more cost-effective than ETP because it does not use expensive tin. However, it cannot be joined by conventional soldering and requires electric resistance welding or organic bonding. TFS offers superior lacquer adhesion, making it the ideal choice for deep-drawn cans (DRD), crown corks, and screw caps where high-quality printing or coating is necessary.

Suppliers must provide certifications ensuring the steel is safe for food contact. Look for compliance with ASTM A657/A657M (Standard Specification for TFS) or EN 10202. For international trade, ensure the manufacturer holds ISO 9001 for quality management and FDA or EC 1935/2004 declarations if the sheets are intended for food or beverage canning.

TFS is widely used in the production of food cans (ends and bodies), aerosol valve cups, chemical containers, and electronic components. Its excellent heat resistance also makes it suitable for bakeware and certain automotive heat shields. Because it resists 'sulfur staining,' it is particularly preferred for packaging protein-rich foods like fish or meat.

The most significant risks include surface oxidation (white rust) due to moisture during sea transit and dimensional deviations. To mitigate this, insist on VCI (Volatile Corrosion Inhibitor) paper packaging and steel pallets. Always request a Mill Test Certificate (MTC) before shipment to verify the chemical composition and mechanical properties align with your order.

Steel prices fluctuate with global iron ore and energy markets. It is advisable to negotiate formula-based pricing for long-term contracts. While standard MOQs for steel mills are often 20-25 tons (one full container load), you can find flexible quantities through verified traders on Made-in-China.com who may offer split-coil options for smaller manufacturing runs.

Ensure the supplier uses seaworthy export packaging with heavy-duty strapping. For shipping to specific regions, be aware of Anti-Dumping Duties (ADD) that may apply to steel products from certain origins. Use Incoterms like CIF or CFR to simplify logistics, but ensure the cargo is covered by All-Risk Insurance to protect against handling damage at the port.

Utilize Secured Trading Services provided by platforms like Made-in-China.com to ensure payment is only released upon proof of shipment. For large orders, hiring a third-party inspection agency (like SGS or Bureau Veritas) to conduct a pre-shipment inspection (PSI) for thickness, coating weight, and quantity is a standard industry best practice.