Stainless Steel Strip Coil SA240 JIS G4305 SS Strip Stainless Steel Belt for Packing

Stainless Steel Strip: A Comprehensive Technical Overview

Stainless steel strip is a cold-rolled, precision-engineered flat product characterized by high corrosion resistance, strength, and versatility. Typically thinner than sheets (thickness: 0.005–6.0 mm, width: 3–2,000 mm), it is supplied in coils or cut lengths for diverse industrial applications137. Its properties stem from chromium (≥10.5%) and alloying elements like nickel or molybdenum, which enable a self-healing oxide layer for rust prevention, alongside superior formability and temperature resilience (-196°C to 800°C)35.

Common Grades & Properties

Stainless steel strips are categorized by microstructure, each with distinct attributes:

Specialized grades:

• Precision strips (e.g., SUS304-CSP) for electronics, thickness down to 0.005 mm7.

• Automotive-specific alloys (e.g., 436L, 445) meeting stringent bendability and salt-spray resistance standards6.

Dimensions & Tolerances

• Thickness: 0.05–5.0 mm (common range), with ultra-thin foils ≤0.1 mm for micro-components17. Tolerances as tight as ±0.01 mm for critical applications5.

• Width: Slit to 3–1,500 mm, tolerances ±0.15 mm13.

• Surface finishes:

  • 2B: Matte, standard cold-rolled finish.

  • BA: Mirror-like, bright-annealed.

  • No.3/No.4: Directional satin polish for aesthetics34.

Processing Capabilities

1. Cold Rolling: Enhances surface smoothness and dimensional accuracy via twenty-high mills69.

2. Heat Treatment:

   • Annealing: Restores ductility using gas-protected continuous furnaces.

   • Temper Rolling: Adjusts hardness (e.g., soft, 1/4 hard, full hard)39.

3. Surface Engineering: Brushing, embossing, or passivation (nitric/citric acid) to boost corrosion resistance35.

4. Slitting & Leveling: Precision width cutting (±0.1 mm) and flattening to eliminate coil curvature17.

Standards & Certifications

• Global Standards: ASTM A240 (US), JIS G4305 (Japan), GB/T 4237 (China), EN 10088 (EU)36.

• Tolerance Norms: ISO 9444 (hot-rolled wide strip) and ISO 9446 (narrow strip) define dimensional deviations, though now superseded810.

• Testing Protocols:

  • Mechanical: Tensile strength (>600 MPa), elongation (>4%)5.

  • Corrosion: Copper-accelerated acetic acid salt spray (CASS) ≥48 hours without rusting6.

Packaging & Handling

Strips are coiled on wooden reels, wrapped in burlap or kraft paper, and secured with steel straps to prevent transit damage. Coil weights range from 500 kg to 5 tons, with moisture-proofing for marine shipments15. Export packaging adheres to seaworthy standards (e.g., wooden matting for containers)24.

Applications by Industry

• Automotive: Exhaust systems (409/436), trim (445), springs (301 hard temper)16.

• Medical: Scalpels (410), implantable device casings (316L), sterilization trays39.

• Electronics: Battery contacts, EMI shields, connectors (precision SUS304 strips)7.

• Construction: Roof flashing, decorative panels (BA or brushed finishes)34.

• Packaging: High-tensile strapping (>600 MPa) for heavy equipment and marine cargo15.