Premium 304 Stainless Steel Coil | Cold Rolled Corrosion Shield

Product Overview

Key Technical Specifications

Tensile & Bend Strength

The 304 stainless steel coil delivers tensile strength of 520–750 MPa and yield strength of ≥290 MPa, making it ideal for applications requiring high ductility and corrosion resistance. Its austenitic structure ensures non-magnetic properties unless cold-worked, which enhances its suitability for electric coil range stainless steel components in kitchen appliances and HVAC systems. The bend strength is optimized for complex forming processes like deep drawing, ensuring crack-free fabrication even under high-stress conditions.

Weight Calculation

Calculate coil weight using:

$$\text{Weight (kg)}=\text{Thickness (mm)}\times \text{Width (m)}\times \text{Length (m)}\times 7.93\times 0.001$$

Example: A 2B-finished 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 and cost estimation.

Identification Methods

• Chemical Analysis: Confirm Cr (18–20%) and Ni (8–10.5%) via XRF testing.
• Magnetic Testing: Non-magnetic in annealed states but slightly magnetic after cold rolling.
• Spark Testing: Produces reddish sparks with minimal branching, distinguishing it from ferritic stainless steel coil grades like 430.

Causes of Stainless Steel Corrosion

1. Chloride-Induced Pitting: Coastal environments or de-icing salts penetrate the passive oxide layer, forming micro-pits.
2. Galvanic Corrosion: Contact with carbon steel or copper in humid conditions accelerates oxidation.
3. Mechanical Abrasion: Scratches from hot rolled stainless steel coil handling tools expose raw metal to oxygen.
4. High-Temperature Oxidation: Prolonged exposure above 870°C degrades chromium’s protective oxide film.
5. Organic Acid Accumulation: Food residues or industrial chemicals form corrosive films on unpolished surfaces.

Applications & Advantages

Versatile Industrial Use

• Food & Medical: 2B/BA finishes (Ra ≤0.2μm) prevent bacterial growth, ideal for surgical tools and dairy tanks.
• Architecture: Mirror and hairline finishes enhance façades while resisting urban pollution.
• Energy & HVAC: Electric coil range stainless steel components ensure thermal stability and corrosion resistance.

Functional Benefits

1. Self-Healing Oxide Layer: Chromium (≥18%) forms Cr₂O₃ film to repair minor scratches.
2. Thermal Stability: Low thermal expansion (9.2×10⁻⁶/°C) minimizes warping under heat stress.
3. Recyclability: 100% recyclable with no quality loss, supporting circular manufacturing goals.

Why Choose Our 304 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 hot rolled 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.