SUS405 Ferritic Stainless Steel Plate/Coil
SUS405 Ferritic Stainless Steel Plate/Coil: Chemical Composition, Properties, and International Equivalents
Complete technical data for SUS405 ferritic stainless steel includes chemical composition, mechanical and thermal properties, global equivalent grades, and application guidance for plate and coil products under JIS G 4304/G 4305.
Annealing, pickling, cold rolling, hot rolling, cutting, forming, welding (with appropriate procedures)
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SUS405 Ferritic Stainless Steel Plate/Coil Introduction
SUS405 is a ferritic stainless steel containing chromium and aluminum, designed for enhanced oxidation resistance and scaling resistance up to 815°C. It offers moderate strength and good ductility in the annealed condition. This non-hardenable alloy is magnetic and exhibits excellent resistance to stress corrosion cracking. Commonly supplied as hot-rolled or cold-rolled plates, sheets, and coils, SUS405 is widely used in automotive exhaust systems, heat exchangers, and industrial furnace components.
SUS405 Ferritic Stainless Steel Plate/Coil Chemical Composition
Chemical composition of SUS405 according to JIS G 4304. The aluminum addition significantly improves high-temperature oxidation resistance. Carbon is kept low to maintain a fully ferritic microstructure and ensure good ductility.
| Chemical Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.08 | - |
| Silicon (Si) | ≤ 1.00 | - |
| Manganese (Mn) | ≤ 1.00 | - |
| Phosphorus (P) | ≤ 0.040 | - |
| Sulfur (S) | ≤ 0.030 | - |
| Chromium (Cr) | 11.50 - 14.50 | Primary element for corrosion and oxidation resistance |
| Aluminum (Al) | 0.10 - 0.30 | Key element to form protective Al₂O₃ scale |
SUS405 Ferritic Stainless Steel Plate/Coil Thermal and Electrical Physical Properties
Typical physical properties of SUS405 at room temperature unless otherwise noted. Values may vary slightly with processing conditions. Thermal expansion and conductivity data at elevated temperatures are provided for design considerations.
| Property | Typical Value | Unit | Test Conditions |
|---|---|---|---|
| Density (ρ) | 7.70 | g/cm³ | At 20°C |
| Modulus of Elasticity (E) | 200 | GPa | At 20°C |
| Shear Modulus (G) | 77 | GPa | Calculated at 20°C |
| Poisson's Ratio (ν) | 0.27 – 0.30 | - | At 20°C |
| Thermal Expansion Coefficient (α) | 10.8 | 10⁻⁶/K | Between 20-100°C |
| Thermal Expansion Coefficient (α) | 11.5 | 10⁻⁶/K | Between 20-500°C |
| Thermal Conductivity (λ) | 26 | W/(m·K) | At 100°C |
| Thermal Conductivity (λ) | 28 | W/(m·K) | At 500°C |
| Specific Heat Capacity (c) | 460 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρ_e) | 0.60 | µΩ·m | At 20°C |
SUS405 Ferritic Stainless Steel Plate/Coil Mechanical Properties
Mechanical properties for SUS405 plates and sheets in the annealed condition as specified in JIS G 4304 and G 4305. Values vary with product thickness; the table gives typical minimum requirements for hot-rolled plates (thickness 5–25 mm). Hardness values are typical maxima.
| Property | Standard Value | Unit | Test Conditions |
|---|---|---|---|
| 0.2% Yield Strength (Proof Stress) | ≥ 175 | MPa | At room temperature; for thickness ≤ 25 mm |
| Tensile Strength (Rm) | ≥ 440 | MPa | At room temperature |
| Elongation (A) | ≥ 20 | % | Gauge length 50 mm; thickness 5 – 12.5 mm |
| Elongation (A) | ≥ 18 | % | Gauge length 50 mm; thickness 12.5 – 100 mm |
| Hardness (HBW) | ≤ 183 | HBW | Typical maximum, annealed condition |
| Hardness (HRB) | ≤ 88 | HRB | For reference, annealed condition |
SUS405 Ferritic Stainless Steel Plate/Coil Fully Equivalent International Grades and Replaceable Designations
| Country / Region | Standard | Designation | Remarks |
|---|---|---|---|
| USA | ASTM A240/A240M | 405 (UNS S40500) | Same chemistry and similar mechanical properties |
| Europe / EU | EN 10088-2 | 1.4002 - X6CrAl13 | Close equivalent; minor differences in Al range |
| China | GB/T 20878 | 06CrAl13 (formerly 0Cr13Al) | Equivalent; Al: 0.10–0.30% |
| International | ISO 4955:2005 | X6CrAl13 (1.4002) | Same as European grade |
SUS405 Ferritic Stainless Steel Plate/Coil Application Introduction
SUS405 is optimally suited for components exposed to oxidizing environments at elevated temperatures up to about 815°C, where aluminum-enhanced scaling resistance extends service life. It is readily formed and welded with appropriate precautions.
Product Applications: Exhaust manifolds, Heat exchanger tubes, Furnace liners, Combustion chambers, Catalytic converter shells, Heat treatment baskets and fixtures
Processed into products: Exhaust system muffler parts, Welded tubes for heat recovery systems, Stamped burner components, Food processing equipment plates, Annealing covers and boxes
Application industries: Automotive, Petrochemical, Power Generation, Food Processing, Industrial Furnace Manufacturing
SUS405 Ferritic Stainless Steel Plate/Coil Similar or Alternative Grades for Reference
| Country / Region | Standard | Designation | Remarks |
|---|---|---|---|
| USA | ASTM A240/A240M | 410S (UNS S41008) | 12% Cr ferritic steel without Al; lower oxidation resistance |
| Japan | JIS G 4304 | SUS410L | Low carbon 12Cr ferritic, no Al; good weldability |
| Europe | EN 10088-2 | 1.4000 - X6Cr13 | 12% Cr ferritic without Al; lower scaling temperature |
| USA | ASTM A240/A240M | 409 (UNS S40900) | Ti stabilized ferritic for exhaust applications; similar usage but lower Cr |
Notes:
Welding: preheat to 150–200°C and post-weld annealing recommended to avoid cracking; filler material can be matching or austenitic (e.g., 309L). Avoid prolonged exposure at 475°C to prevent embrittlement. Not suitable for strong reducing acids or high-chloride environments due to risk of pitting corrosion.
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