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Advanced 304/316 Stainless Steel Coil | Polished Durability
Advanced 304/316 Stainless Steel Coil | Polished Durability
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Advanced 304/316 Stainless Steel Coil | Polished Durability
Product Overview
Our Advanced 304/316 Stainless Steel Coil combines premium aesthetics with industrial-grade performance, engineered for applications demanding corrosion resistance, structural integrity, and precision finishes. Ideal for stainless steel coil spring manufacturing, stainless steel coil tube fabrication, and stainless steel heat exchanger coil systems, this product is trusted by global industries for its versatility and reliability. With a polished surface and cold-rolled precision, it excels in harsh environments while maintaining exceptional formability.
Technical Specifications
| Property | 304 Stainless Steel Coil | 316 Stainless Steel Coil |
|---|---|---|
| Thickness | 0.25–12mm (Cold Rolled: 0.25–3mm; Hot Rolled: 3–12mm) | 0.25–12mm (Cold Rolled: 0.25–3mm; Hot Rolled: 3–12mm) |
| Width | 1000–2000mm (Customizable Slit Edges) | 1000–2000mm (Customizable Slit Edges) |
| Surface Finish | 2B, BA, No.4 (Matte), Mirror, HL (Hairline) | 2B, BA, Mirror, HL, No.4 |
| Hardness (Rockwell B) | ≤88 HRB | ≤95 HRB |
| Tensile Strength | ≥520 MPa | ≥485 MPa |
| Yield Strength | ≥205 MPa | ≥170 MPa |
| Elongation (δ5) | ≥40% | ≥40% |
| Density | 7.93 g/cm³ | 7.98 g/cm³ |
| Melting Point | 1400–1450°C | 1375–1400°C |
| Certifications | ASTM A240, EN 10088-2, ISO 9444 | ASTM A240, ASME SA240, ISO 9444 |
Mechanical & Functional Properties
Tensile & Bending Strength
The 304 stainless steel coil achieves a tensile strength of ≥520 MPa, making it suitable for high-stress applications like stainless steel coil spring systems and architectural frameworks. Its elongation (≥40%) allows seamless bending and forming for complex geometries.
The 316 stainless steel coil, with a tensile strength of ≥485 MPa, offers superior corrosion resistance due to 2-3% molybdenum content, ideal for stainless steel heat exchanger coil systems in marine or chemical environments. Its austenitic structure ensures resistance to pitting and crevice corrosion, even in chloride-rich settings.
Weight Calculation
Calculate coil weight using:
Weight (kg) = Thickness (mm) × Width (m) × Length (m) × Density (g/cm³)
- Example for 304 Coil: 2mm × 1.5m × 50m × 7.93 ≈ 1,189.5 kg
- Example for 316 Coil: 1.5mm × 1.219m × 50m × 7.98 ≈ 731 kg
Why Stainless Steel Rusts?
Though inherently corrosion-resistant, stainless steel can rust under extreme conditions:
- Chloride Exposure: Coastal or de-icing environments degrade the chromium oxide layer, particularly in 304-grade coils.
- Mechanical Damage: Scratches during fabrication (e.g., stainless steel coil tube machining) expose raw metal to oxidation.
- Galvanic Corrosion: Contact with carbon steel or copper in electrolyte-rich environments accelerates rusting.
- High-Temperature Oxidation: Prolonged exposure above 870°C (304) or 843°C (316) weakens the passive layer.
Identification & Traceability
Each coil is laser-marked with:
- Grade: 304/304L or 316/316L
- Batch Code: Linked to MTC (Mill Test Certificate) for full traceability.
- Surface Finish: e.g., 2B (Cold Rolled Matte), Mirror.
Applications
- Automotive: Stainless steel coil spring systems and exhaust components.
- Industrial Tubing: Stainless steel coil tube for hydraulic systems and heat exchangers.
- Energy Sector: Stainless steel heat exchanger coil in power plants and marine boilers.
- Architecture: Mirror-finished façades and structural cladding.
Manufacturing Excellence
Surface Finishing Process
Our polished durability is achieved through:
- Cold Rolling: Precision reduction (±0.01mm tolerance) for uniform thickness.
- Bright Annealing (BA): Hydrogen-nitrogen atmosphere treatment to eliminate oxidation.
- Electropolishing: Electrochemical smoothing for corrosion-resistant, reflective surfaces.
Quality Assurance
- Material Sourcing: Direct procurement from TISCO/BAOSTEEL with ISO 9001 certification.
- Testing: Salt spray tests (1,000+ hours) and spectrometer analysis for alloy integrity.
Why Choose Our Stainless Steel Coils?
- Global Compliance: Dual ASTM/EN certifications for cross-border projects.
- Customization: Slit-to-width (±0.1mm tolerance) and rewinding services for niche applications.
- Rapid Delivery: 7–15 days lead time with PVC-coated packaging to prevent transit damage.
- Sustainability: 100% recyclable material with SGS-certified eco-friendly processes.
- Technical Support: 24/7 engineering guidance on fabrication and corrosion prevention.
