SUS434 Ferritic Stainless Steel Plate/Coil
SUS434 Ferritic Stainless Steel Plate/Coil - Corrosion Resistant Mo-Alloyed Grade
Comprehensive technical data for SUS434 ferritic stainless steel: chemical composition, mechanical and physical properties, international equivalents, and typical applications in automotive and household appliances.
Hot rolling, cold rolling, annealing, pickling, forming (bending, drawing, stamping), welding (TIG, MIG, resistance)
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SUS434 Ferritic Stainless Steel Plate/Coil Introduction
SUS434 is a molybdenum-containing ferritic stainless steel standardized under JIS G4304/G4305 for hot-rolled and cold-rolled plates/coils. It offers enhanced corrosion resistance over standard SUS430 due to the addition of 0.9–1.3% Mo, particularly against pitting in chloride environments. Key features:
- Ferritic microstructure, magnetic in all conditions
- Good oxidation resistance up to ~800°C intermittent service
- Cannot be hardened by heat treatment; supplied in annealed condition
- Excellent formability and deep drawability comparable to austenitic grades
- Resistant to stress corrosion cracking (SCC) in chloride media
The grade is widely used for automotive trim, exhaust components, and household appliances where a balance of cost and corrosion resistance is required.
SUS434 Ferritic Stainless Steel Plate/Coil Chemical Composition
The chemical composition conforms to JIS G4304:2012 and JIS G4305:2012. Values are ladle analysis. Residual elements such as Ni are not specified but typically held below 0.60%.
- Molybdenum improves pitting and crevice corrosion resistance.
- Chromium content ensures ferritic structure and oxidation resistance.
| Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.12 | Maximum |
| Silicon (Si) | ≤ 1.00 | Maximum |
| Manganese (Mn) | ≤ 1.00 | Maximum |
| Phosphorus (P) | ≤ 0.040 | Maximum |
| Sulfur (S) | ≤ 0.030 | Maximum |
| Chromium (Cr) | 16.00 – 18.00 | |
| Molybdenum (Mo) | 0.90 – 1.30 | |
| Nickel (Ni) | (≤ 0.60) | Not specified; typical residual level |
SUS434 Ferritic Stainless Steel Plate/Coil Physical Properties
Physical properties are representative for SUS434 in annealed condition. Thermal conductivity is higher than austenitic stainless steels, making it favorable for heat exchanger uses. Magnetic properties are retained at all temperatures due to ferritic structure.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.70 | g/cm³ | 20°C |
| Elastic Modulus (E) | 200 | GPa | 20°C |
| Shear Modulus (G) | 77 | GPa | 20°C |
| Poisson's Ratio (ν) | 0.30 | – | 20°C |
| Thermal Expansion (α) | 10.4 | ×10⁻⁶/K | 20–100°C |
| Thermal Expansion (α) | 10.8 | ×10⁻⁶/K | 20–200°C |
| Thermal Expansion (α) | 11.2 | ×10⁻⁶/K | 20–400°C |
| Thermal Conductivity (λ) | 26 | W/m·K | 100°C |
| Specific Heat Capacity (c) | 460 | J/kg·K | 20°C |
| Electrical Resistivity (ρ_e) | 0.60 | μΩ·m | 20°C |
SUS434 Ferritic Stainless Steel Plate/Coil Mechanical Properties
Properties apply to annealed condition as delivered. Values meet the minimum requirements of JIS G4304/G4305. Elongation requirements depend on product thickness and form. Bending test is 180° with no cracks; bend diameter varies with thickness. Hardness is provided for reference.
| Property | Required Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Tensile Strength (Rm) | ≥ 450 | MPa | Annealed, room temperature |
| Yield Strength (Rp0.2) | ≥ 205 | MPa | Annealed, room temperature |
| Elongation (A) | ≥ 20 | % | Cold-rolled, thickness 0.30 ≤ t < 1.0 mm |
| Elongation (A) | ≥ 22 | % | Cold-rolled, thickness 1.0 ≤ t < 3.0 mm |
| Elongation (A) | ≥ 22 | % | Hot-rolled, thickness ≤ 8 mm (transverse) |
| Hardness | ≤ 200 | HV | Annealed |
| Hardness | ≤ 190 | HBW | Annealed, for reference |
| Bending Test | D = 1t (t ≤ 8 mm) | – | Bend angle 180°, no cracks |
| Bending Test | D = 2t (t > 8 mm) | – | Bend angle 180°, no cracks |
SUS434 Ferritic Stainless Steel Plate/Coil Complete Equivalent Grade Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G4304/G4305 | SUS434 | Original designation |
| USA | ASTM A240 | Type 434 (UNS S43400) | Identical chemical composition |
| Europe | EN 10088-2 | X6CrMo17-1 (1.4113) | Very close match, slight C difference (≤0.08) |
| China | GB/T 3280 | 10Cr17Mo | Equivalent to SUS434 |
SUS434 Ferritic Stainless Steel Plate/Coil Application Introduction
SUS434 is selected where enhanced corrosion resistance beyond SUS430 is needed, but cost or magnetic requirements preclude austenitic grades. Typical usage scenarios:
- Automotive mufflers, tailpipes, and catalytic converter heat shields
- Washing machine drums and dishwasher interiors
- Kitchen sinks and countertops
- Heat exchanger tubes for moderate temperatures
- Decorative architectural panels in mildly corrosive urban environments
The material can be readily formed into complex shapes and joined by conventional welding methods with matching or slightly over-alloyed filler (e.g., 308L).
Product Applications: Automotive muffler assemblies, Washing machine drums, Heat exchanger shells, Kitchen sinks, Decorative panels
Processed into products: Exhaust muffler shell and end caps, Exhaust pipe connectors, Dishwasher tubs, Drawn sink bowls, Stamped oven cavity liners, Heat exchanger baffles
Application industries: Automotive (exhaust systems, trim), Home appliances (laundry, kitchen), Chemical/petrochemical (moderate corrosion service), Architecture, building and construction (cladding), Food processing equipment
SUS434 Ferritic Stainless Steel Plate/Coil Similar/Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G4304/G4305 | SUS430 | Lacks Mo; lower pitting resistance |
| Japan | JIS G4304/G4305 | SUS430J1L | Contains Cu, Nb; better deep drawability |
| Japan | JIS G4304/G4305 | SUS444 | Higher Mo, stabilized with Nb/Ti; superior corrosion resistance |
| USA | ASTM A240 | Type 436 | Mo and Nb stabilized; similar corrosion resistance |
| USA | ASTM A240 | Type 439 | Ti stabilized; lower Mo, good for exhaust systems |
Notes:
Magnetic properties: Susceptible to 475°C embrittlement after long exposure; welding should be followed by post-weld annealing if toughness is critical. Surface finishes commonly supplied: No.2B (cold-rolled), No.1 (hot-rolled). All data provided are for informational purposes based on JIS standards; actual mill test certificates should be consulted for exact values.
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