Reliable 201/304 Stainless Steel Coil | Mirror & Hairline Finish

Product Overview

Key Technical Specifications

Tensile & Bend Strength

The 201 stainless steel coil offers tensile strength of ≥450 MPa and yield strength of ≥205 MPa, making it ideal for decorative applications like architectural accents and kitchen trim. Its ferritic structure ensures magnetic properties, advantageous for components like large stainless steel coil storage systems.

The 304 stainless steel coil delivers superior tensile strength (520–750 MPa) and yield strength (≥290 MPa), optimized for high-stress environments like food processing equipment and medical tools. Its austenitic structure resists chloride-induced pitting, making it ideal for polished stainless steel coil surfaces in humid or marine settings.

Weight Calculation

Calculate coil weight using:

$$\text{Weight (kg)}=\text{Thickness (mm)}\times \text{Width (m)}\times \text{Length (m)}\times \text{Density (g/cm³)}\times 0.001$$

Example: A 304 coil (2mm thick, 1.5m wide, 50m long) weighs:

$$2\times 1.5\times 50\times 7.93\times 0.001=11.89\text{kg}$$

This formula is critical for logistics planning, especially for kanthal vs stainless steel coils comparisons in industrial projects.

Identification Methods

• Chemical Analysis: Confirm Cr (16–18%) and Mn (5.5–7.5%) for 201; Cr (18–20%) and Ni (8–10.5%) for 304 via XRF testing.
• Spark Testing: 201 produces bright, short sparks due to high manganese; 304 generates reddish sparks with minimal branching.
• Magnetic Testing: 201 is fully magnetic; 304 remains non-magnetic unless cold-worked.

Causes of Stainless Steel Corrosion

1. Chloride Exposure: Coastal environments or de-icing salts penetrate the passive oxide layer, triggering pitting in 304 and intergranular corrosion in 201 due to lower nickel content.
2. Galvanic Corrosion: Contact with carbon steel or copper in humid conditions accelerates oxidation, particularly in large stainless steel coil storage systems.
3. Mechanical Damage: Scratches from handling tools expose raw metal to oxygen, compromising the protective Cr₂O₃ layer.
4. Organic Acid Accumulation: Food residues or industrial chemicals form corrosive films, especially on unpolished polished stainless steel coil surfaces.

Applications & Advantages

Versatile Industrial Use

• Architecture: Mirror and hairline finishes enhance façades while resisting urban pollution (e.g., elevator panels, signage).
• Food & Medical: 304’s hygienic 2B/BA finishes (Ra ≤0.2μm) prevent bacterial growth in dairy tanks and surgical tools.
• Energy & HVAC: Kan­thal vs stainless steel coils comparisons highlight 304’s thermal stability (up to 870°C) for heat exchangers.

Functional Benefits

1. Self-Healing Oxide Layer: Chromium (≥16% in 201, ≥18% in 304) forms Cr₂O₃ film to repair minor scratches.
2. Cost Efficiency: 201 reduces material costs by 30–40% compared to 304, ideal for budget-sensitive projects.
3. Recyclability: 100% recyclable with no quality loss, supporting circular manufacturing goals.

Why Choose Our Stainless Steel Coils?

1. Certified Quality: Sourced from TISCO/BAOSTEEL mills with ISO 9001 and SGS compliance.
2. Custom Fabrication: Tailored slitting (3–2000mm), embossing, and polishing for polished stainless steel coil projects.
3. Global Logistics: 7–15-day delivery via FOB/CIF with VCI anti-rust packaging.
4. Cost Efficiency: Direct mill partnerships reduce costs by 15–20% vs. competitors.
5. Technical Expertise: 20+ years in alloy selection, welding, and corrosion prevention.