Ultimate Stainless Steel Coil – Hairline 201

Ultimate Stainless Steel Coil – Hairline 201

Overview

Hairline 201 Stainless Steel Coil is an austenitic, low-nickel chromium alloy engineered for cost-effective corrosion resistance and aesthetic versatility. Its distinctive hairline finish features uniform linear polishing streaks that conceal scratches while providing a sleek, matte-satin appearance. Ideal for architectural cladding, elevator panels, and decorative hardware, this grade combines affordability with reliable performance in mildly corrosive environments.

Technical Specifications

Table 1: Chemical Composition (ASTM A240)

Table 2: Mechanical Properties

Table 3: Physical Properties

Table 4: Size & Tolerance (Cold Rolled)

Table 5: Processing Capabilities

Detailed Properties & Performance

1. Tensile Strength and Bendability

Hairline 201 delivers tensile strength of 520–750 MPa, enabling structural integrity in applications like stainless steel coil spring systems and load-bearing architectural frameworks. Its high elongation (≥45%) permits aggressive forming operations—including 180° bending (radius ≥1.5× thickness)—without cracking. Unlike martensitic stainless steel coil grades, 201 retains ductility without heat treatment, reducing fabrication costs.

2. Corrosion Resistance and Rust Prevention

While resistant to organic acids and atmospheric exposure, 201 may corrode under prolonged chloride contact (e.g., coastal or de-icing salt environments). Rust triggers include:

• Passive Layer Damage: Scratches or iron contamination disrupt chromium oxide formation.
• Intergranular Corrosion: Manganese sulfide inclusions accelerate pitting in sulfur-rich environments.
• Galvanic Corrosion: Contact with carbon steel or copper in humid conditions.
  Prevention strategies:
• Hairline Finish: Unidirectional grain structure reduces micro-pit formation.
• Passivation: Nitric acid treatments restore oxide layers post-fabrication.

3. Identification and Certification

Coils comply with ASTM A240, EN 10088-2, and JIS G4303. Each batch includes:

• Laser-etched markings: "SUS201-HL" near the coil head.
• Mill Test Certificate (EN 10204 3.1): Validates chemical/mechanical properties and salt-spray test results (168+ hours per ASTM B117).

4. Weight Calculation

Calculate coil mass using:
Weight (kg) = Thickness (mm) × Width (mm) × Length (m) × Density (7.80) ÷ 1000
Example: A 1.0mm × 1219mm × 500m coil weighs ≈4,750 kg (±2% tolerance).

Key Advantages of Stainless Steel Coils

The advantages of stainless steel coils extend beyond corrosion resistance:

1. Hygienic Performance: Non-porous hairline surfaces resist bacterial growth, ideal for food processing equipment.
2. Thermal Resilience: Withstands temperatures up to 870°C without scaling, outperforming carbon steel in heat exchangers.
3. Recyclability: 100% recyclable with no degradation—70% lower carbon footprint vs. virgin alloy production.
4. Aesthetic Flexibility: Hairline finishes conceal fingerprints and scratches, maintaining visual appeal in high-traffic areas.

Applications

• Architecture: Elevator cladding, column covers, and signage (hairline finish masks installation scratches).
• Industrial Springs: Stainless steel coil spring assemblies for automotive seats and valves.
• Consumer Hardware: Cabinet handles, appliance trims, and decorative fasteners.
• Cost-Driven Replacements: Alternative to 304 in low-chloride environments (e.g., interior drywall framing).

Why Choose Our Hairline 201 Stainless Steel Coils?

1. Zero Surface Defects: Hairline finishes achieve ≤0.4µm Ra via precision abrasive brushing—25% smoother than industry averages.
2. Custom Metallurgy: Manganese-nitrogen stabilization enhances strength without nickel surcharges.
3. Rapid Turnaround: 7-day delivery for 20+ MT orders—30% faster than competitors.
4. Spring-Focused Processing: Optimized annealing (1050°C) ensures uniform hardness for stainless steel coil spring production.
5. Lifetime Technical Support: On-call metallurgists for weld/bending consultancy.