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Advanced Stainless Steel Coil – 316L Hairline
Advanced Stainless Steel Coil – 316L Hairline
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Overview
316L Hairline Stainless Steel Coil combines austenitic corrosion resistance with a distinctive satin finish, featuring uniform linear polishing that conceals scratches and fingerprints. This cost-effective alloy (16–18% Cr, 10–14% Ni, 2–3% Mo) excels in architectural, marine, and industrial applications where aesthetics and durability are critical. Its low carbon content (≤0.03%) prevents sensitization during welding, while the hairline finish (Ra 0.1–0.4µm) enhances wear resistance and simplifies maintenance.
Technical Specifications
Table 1: Chemical Composition (ASTM A240/ASME SA240)
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 16.00–18.00 |
| Nickel (Ni) | 10.00–14.00 |
| Molybdenum (Mo) | 2.00–3.00 |
| Carbon (C) | ≤0.030 |
| Manganese (Mn) | ≤2.00 |
| Nitrogen (N) | ≤0.10 |
Table 2: Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥485 MPa |
| Yield Strength (0.2% Offset) | ≥170 MPa |
| Elongation (50mm) | ≥40% |
| Hardness (Rockwell B) | ≤95 HRB |
| Modulus of Elasticity | 193 GPa |
Table 3: Size & Tolerance
| Parameter | Range | Tolerance |
|---|---|---|
| Thickness | 0.3–6.0 mm | ±0.02 mm (Cold Rolled) |
| Width | 600–2000 mm | ±1.0 mm |
| Coil Weight | 3–20 MT | ±2% |
| Surface Finish | Hairline (HL), 2B, BA, No.4, Mirror | ASTM A480 |
| stainless steel coil range | Custom widths: 200–2000 mm | Slitting tolerance: ±0.1 mm |
Table 4: Processing Capabilities
| Technique | Tolerance | Standard |
|---|---|---|
| Slitting | ±0.1 mm | ASTM A480 |
| Decoiling | Flatness ≤0.5° | EN 10029 |
| Bending | Min. radius: 1.5× thickness | ISO 9013 |
| Welding | TIG/MIG compliant | ASME IX |
Detailed Properties & Performance
1. Tensile Strength and Bendability
316L Hairline coils deliver tensile strength ≥485 MPa, ensuring structural integrity in high-stress applications like marine balustrades or chemical processing equipment. The nitrogen-stabilized austenitic structure permits elongation up to 40%, enabling 180° bends (radius ≥1.5× thickness) without cracking. Post-bend annealing (1050–1100°C) reverses work hardening, restoring corrosion resistance for welded assemblies.
2. Corrosion Resistance & Rust Prevention
Molybdenum enhances resistance to pitting/crevice corrosion in chloride-rich environments (e.g., coastal architecture with >500 ppm salinity). Rust occurs only under:
- Surface Contamination: Embedded iron particles or grease disrupt the passive chromium oxide layer, accelerating oxidation.
- Thermal Damage: Carbide precipitation at 450–850°C reduces intergranular corrosion resistance.
- Galvanic Coupling: Contact with carbon steel or copper in humid conditions.
Preventive measures include: - Passivation: Nitric acid treatments post-fabrication restore oxide layers.
- Hairline Grain Alignment: Unidirectional polishing minimizes micro-pit formation where contaminants accumulate.
3. Identification & Certification
Each coil includes:
- Laser-etched markings ("316L-HL") near the inner diameter for traceability.
- Mill Test Certificate (EN 10204 3.1) validating compliance with ASTM A240, PED 2014/68/EU, and ISO 9227 salt-spray results (500+ hours).
4. Weight Calculation
Calculate coil mass using:
Weight (kg) = Thickness (mm) × Width (mm) × Length (m) × Density (8.0) ÷ 1000
Example: A 1.5mm × 1219mm × 500m coil ≈7,314 kg (±2%). Custom cuts optimize yield for architectural cladding, reducing stainless steel coil prices for bulk orders.
Applications
- Architecture: Elevator interiors, column cladding (hairline finish hides installation scratches).
- Marine: Ship bulkheads, offshore platform components (resists saltwater pitting).
- Industrial: Chemical tanks, conveyor systems (immune to organic acids).
- Consumer Hardware: Appliance panels, decorative trims (aesthetic durability).
Why Choose Our 316L Hairline Coils?
- Zero-Scratch Hairline Finish: Precision abrasive brushing achieves ≤0.3µm Ra—30% smoother than industry averages—with unidirectional grain alignment.
- Global Compliance: Certified to ASTM A240, ASME Sec. VIII, and EN 10088-2 for pressure vessels.
- Factory-Direct Customization: Our stainless steel coil factory in Guangdong offers slitting, annealing, and edge-milling for widths up to 2000mm (MOQ: 1 ton).
- Competitive Pricing: 15% lower stainless steel coil prices versus EU suppliers due to integrated milling and logistics.
- 25-Year Warranty: Guaranteed against intergranular corrosion and pitting in ISO 9223 C3-C4 environments.
