🟧 Product Overview
Ferritic stainless steel coils are chromium‑based alloys with:
- Low nickel content (cost‑effective)
- Good corrosion resistance
- Excellent oxidation resistance
- Strong performance in high‑temperature environments
- Magnetic properties
- Good formability and weldability
This series is widely used in automotive, household appliances, and heat‑resistant industrial applications.
405 — Basic Heat‑Resistant Ferritic Stainless Steel
- Lower chromium content
- Good oxidation resistance
- Suitable for moderate‑temperature applications
409 — Automotive Exhaust Grade
- Widely used in automotive exhaust systems
- Good heat resistance and corrosion resistance
- Cost‑effective alternative to higher grades
430 — General‑Purpose Ferritic Stainless Steel
- Excellent corrosion resistance in mild environments
- Widely used in appliances, kitchenware, and decorative applications
439 — Stabilized Ferritic Stainless Steel
- Ti‑stabilized for improved weldability
- Better corrosion resistance than 430
- Ideal for automotive exhaust and welded structures
- Contains molybdenum for enhanced corrosion resistance
- Excellent resistance to pitting and chloride environments
- Suitable for heat exchangers and hot‑water systems
🟧 Available Grades
405, 409, 430, 439, 444
🟧 Standards
- ASTM A240 / A480
- JIS G4304 / G4305
- EN 10088‑2
- GB/T 3280
🟧 Chemical Composition (Typical)
| Element | 405 (%) | 409 (%) | 430 (%) | 439 (%) | 444 (%) |
|---|
| C | ≤0.08 | ≤0.03 | ≤0.12 | ≤0.03 | ≤0.025 |
| Cr | 11.5–14.5 | 10.5–11.75 | 16.0–18.0 | 17.0–19.0 | 17.5–19.5 |
| Ni | ≤0.5 | ≤0.5 | ≤0.75 | ≤0.5 | ≤1.0 |
| Mo | – | – | – | – | 1.75–2.50 |
| Ti / Nb | – | Stabilized | – | Ti stabilized | Nb stabilized |
Note: 444’s molybdenum content is the key factor behind its superior pitting and chloride corrosion resistance.
🟧 Mechanical Properties (Typical)
| Grade | Yield Strength | Tensile Strength | Elongation |
|---|
| 405 | ≥205 MPa | ≥410 MPa | ≥20% |
| 409 | ≥170 MPa | ≥380 MPa | ≥20% |
| 430 | ≥205 MPa | ≥450 MPa | ≥22% |
| 439 | ≥205 MPa | ≥430 MPa | ≥25% |
| 444 | ≥240 MPa | ≥480 MPa | ≥20% |
🟧 Product Specifications
Thickness
Width
Surface Finishes
- 2B
- BA
- No.1
- No.4
- HL
- Mirror 8K
🟧 Applications
405 — Moderate‑Temperature Applications
- Heat‑resistant components
- Industrial equipment
409 — Automotive Exhaust Systems
- Mufflers
- Exhaust pipes
- Catalytic converter shells
430 — General‑Purpose Applications
- Home appliances
- Kitchen equipment
- Decorative panels
439 — Welded & Automotive Applications
- Exhaust systems
- Welded structures
- Heat‑resistant components
444 — High‑Corrosion‑Resistance Applications
- Heat exchangers
- Hot‑water tanks
- Solar water heaters
- Industrial chloride environments
🟧 Why Choose WelSteels
- Full ferritic stainless steel coil supply (405 / 409 / 430 / 439 / 444)
- Cost‑effective and high‑performance options
- Excellent heat and corrosion resistance
- SGS / BV inspection available
- Export‑grade seaworthy packaging
