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Industrial Stainless Steel Coil – Grade 430 Polished
Industrial Stainless Steel Coil – Grade 430 Polished
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Industrial Stainless Steel Coil – Grade 430 Polished
Overview
Grade 430 Stainless Steel Coil is a ferritic, straight chromium (16–18%) alloy combining excellent corrosion resistance, formability, and cost-effectiveness. Its non-hardenable nature makes it ideal for automotive trim, kitchen appliances, architectural cladding, and heat exchangers. With magnetic properties and thermal conductivity superior to austenitic grades, it excels in stainless steel heating coil and stainless steel coil tubing heat exchanger applications.
Technical Specifications
Table 1: Chemical Composition (ASTM A240)
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤0.12 |
| Chromium (Cr) | 16.00–18.00 |
| Manganese (Mn) | ≤1.00 |
| Silicon (Si) | ≤0.75 |
| Nickel (Ni) | ≤0.60 |
| Phosphorus (P) | ≤0.040 |
| Sulfur (S) | ≤0.030 |
Table 2: Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥450 MPa |
| Yield Strength (0.2% Offset) | ≥205 MPa |
| Elongation (50mm) | ≥22% |
| Hardness (Brinell) | ≤183 HB |
| Density | 7.75 g/cm³ |
Table 3: Physical Properties
| Property | Value |
|---|---|
| Thermal Conductivity (100°C) | 26.1 W/m·K |
| Coefficient of Thermal Expansion (20–100°C) | 5.7 × 10⁻⁶/°C |
| Electrical Resistivity | 600 nΩ·m |
| Modulus of Elasticity | 200 GPa |
Table 4: Size & Tolerance
| Parameter | Range | Tolerance |
|---|---|---|
| Thickness | 0.1–8.0 mm | ±0.01–±0.75 mm |
| Width | 3–2000 mm | ±0.2–±20 mm |
| Coil Weight | 1–20 MT | Customizable |
| Surface Finish | 2B, BA, No.4, No.8, Mirror | N/A |
Detailed Properties & Performance
1. Tensile Strength
Grade 430 delivers a minimum tensile strength of 450 MPa, ensuring structural integrity under mechanical stress. This robustness supports high-pressure applications like stainless steel coil tubing heat exchanger systems, where resistance to internal pressure and thermal cycling is critical. Its elongation (>22%) permits deep drawing and stamping without fracture.
2. Bending and Formability
Despite being ferritic, Grade 430 exhibits superior bendability due to low work-hardening rates. It withstands stretch forming, bending, and drawing operations, making it optimal for stainless steel coil wire and complex fabrications like exhaust manifolds or appliance housings. Post-bend annealing (760–815°C) restores ductility if embrittlement occurs.
3. Identification & Certification
Coils comply with ASTM A240, EN 10088-2, and JIS G4303 standards. Each batch includes a mill test certificate (EN 10204 3.1) with heat number, chemical analysis, and mechanical properties. Laser-etched logos specify grade (e.g., "SUS430" or "1.4016") for traceability.
4. Weight Calculation
Calculate coil weight using:
Weight (kg) = Thickness (mm) × Width (mm) × Length (m) × Density (7.75) ÷ 1000
Example: A 1.5mm × 1219mm × 1000m coil weighs ≈14,200 kg. Tolerances adhere to ASTM ±5% for mass.
5. Corrosion Resistance & Rust Prevention
While resistant to nitric acid and organic acids, Grade 430 may corrode under prolonged exposure to chlorides or acidic environments. Rust occurs if:
- Chromium oxide layer is damaged by abrasion or contamination.
- Intergranular corrosion arises from carbide precipitation (400–600°C).
- Galvanic corrosion results from contact with dissimilar metals.
Solutions include: - BA/No.8 mirror finishes to enhance passive layer integrity.
- Avoiding chloride-rich environments (e.g., coastal areas).
Applications
- Heat Exchangers: Stainless steel coil tubing heat exchanger systems leverage thermal conductivity (26.1 W/m·K) and oxidation resistance (up to 815°C).
- Heating Coils: Stainless steel heating coil units in industrial boilers and HVAC.
- Wire & Fasteners: Stainless steel coil wire for springs, bolts, and automotive pins.
- Architecture: Roofing, elevator panels, and decorative trims (BA/No.4 finishes).
Why Choose Our Grade 430 Stainless Steel Coils?
- Zero Defect Surfaces: BA and mirror finishes achieve ≤0.3μm Ra smoothness, reducing friction in stainless steel coil tubing heat exchanger systems.
- Global Compliance: Certified to ISO 9001, SGS, and PED for pressure equipment.
- Precision Tolerances: Thickness controlled to ±0.01mm for thin coils (0.1–1.0mm).
- End-to-End Solutions: Custom slitting, annealing, and polishing for stainless steel heating coil or wire applications.
- Corrosion Warranty: 10-year guarantee against pitting and oxidation in certified environments.
