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Economical Stainless Steel Coil – Grade 201 Finish
Economical Stainless Steel Coil – Grade 201 Finish
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Economical Stainless Steel Coil – Grade 201 Finish
Overview
Grade 201 Stainless Steel Coil is an austenitic, low-nickel chromium alloy engineered for cost efficiency without compromising structural integrity. With 16–18% chromium and 3.5–5.5% nickel, it offers robust corrosion resistance, high formability, and a premium polished stainless steel coil finish ideal for architectural, automotive, and consumer hardware applications. Its nitrogen-enhanced composition boosts strength while reducing raw material costs, making it a practical alternative to Grade 304 in low-chloride environments.
Technical Specifications
Table 1: Chemical Composition (ASTM A240)
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 16.00–18.00 |
| Nickel (Ni) | 3.50–5.50 |
| Manganese (Mn) | 5.50–7.50 |
| Carbon (C) | ≤0.15 |
| Nitrogen (N) | ≤0.25 |
| Silicon (Si) | ≤1.00 |
Table 2: Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 520–750 MPa |
| Yield Strength (0.2% Offset) | ≥275 MPa |
| Elongation (50mm) | ≥35% |
| Hardness (Brinell) | ≤260 HB |
| Modulus of Elasticity | 193 GPa |
Table 3: Size & Tolerance
| Parameter | Range | Tolerance |
|---|---|---|
| Thickness | 0.3–3.0 mm | ±0.02 mm (Cold Rolled) |
| Width | 600–1550 mm | ±1.0 mm |
| Coil Weight | 1–20 MT | ±2% |
| Surface Finish | 2B, BA, No.4, HL (Hairline), polished stainless steel coil (No.8 Mirror) | ASTM A480 |
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
Grade 201 delivers tensile strength of 520–750 MPa—20% higher than 304 stainless steel—enabling load-bearing performance in structural frames, automotive trims, and conveyor systems. Its elongation (≥35%) permits aggressive forming operations, including 180° bending (radius ≥1.5× thickness) without fracture. Unlike martensitic stainless steel coil, 201 requires no post-bend heat treatment, reducing fabrication costs.
2. Corrosion Resistance & 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 embedded iron particles 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: - Polished Finishes: Mirror (No.8) or BA surfaces reduce micro-pit formation.
- Passivation: Nitric acid treatments restore oxide layers after machining.
3. Identification & Certification
Each coil includes:
- Laser-etched markings: "SUS201" or "1.4372" near the inner diameter.
- Mill Test Certificate (EN 10204 3.1): Validates compliance with ASTM A240, EN 10088-2, and JIS G4303.
- Third-party validation (SGS, TÜV) for food and construction applications.
4. Weight Calculation Formula
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).
Applications
- Architecture: Elevator cladding, column covers (HL finish hides installation scratches).
- Automotive: Exhaust trims, wheel covers (resists road salt oxidation).
- Consumer Hardware: Sinks, cookware, and polished stainless steel coil for decorative fixtures.
- Industrial: Conveyor belts, storage tanks (immune to organic acid corrosion).
Why Choose Our Grade 201 Stainless Steel Coils?
- Zero-Defect Surfaces: Mirror/BA finishes achieve ≤0.05µm Ra via electrolytic polishing—ideal for medical or food-grade stainless steel coil for sale.
- Global Compliance: Certified to ASTM A240, PED 2014/68/EU, and ISO 9001:2015.
- Precision Customization: Slitting, annealing, and edge-milling for widths up to 2000mm—optimized for stainless steel coil china export standards.
- Cost Efficiency: 30% lower than 304 coils—MOQ 1 ton with 7-day delivery.
- 15-Year Warranty: Guaranteed against pitting in ISO 9223 C1-C2 environments.
