ASTM A240 430 (S43000) Ferritic Stainless Steel Pipe
ASTM A240 430 (S43000) Ferritic Stainless Steel Pipe | Properties & Data
Comprehensive data on ASTM A240 430 (S43000) stainless steel pipe: chemical composition, mechanical properties, thermal and electrical properties, international equivalents, and applications.
Cold forming, stamping, deep drawing, welding, laser cutting, punching
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ASTM A240 430 Ferritic Stainless Steel Pipe Introduction
ASTM A240 430 (S43000) is a ferritic chromium stainless steel with a nominal chromium content of 16-18%, and essentially nickel-free. It offers good corrosion resistance in mildly corrosive environments, excellent formability, and is magnetic. Due to its relatively low alloying cost, it is widely used in decorative, automotive, and appliance applications. <ul><li>Key attributes: magnetic, non-hardenable by heat treatment, and resistant to stress corrosion cracking.</li><li>Typical uses: interior architecture, automotive trim, dishwasher liners, and kitchen equipment.</li><li>Delivery condition: annealed and pickled, meeting ASTM A240 requirements.</li></ul> It cannot be hardened by quenching, but moderate strengthening can be achieved through cold working.
ASTM A240 430 Ferritic Stainless Steel Pipe Chemical Composition
Chemical composition limits for ASTM A240 UNS S43000 as required by the standard. <ul><li>The alloy is a low-carbon ferritic stainless steel with chromium content between 16.0% and 18.0%. It is not intentionally alloyed with nickel, but a small residual amount may be present.</li><li>Silicon and manganese are present for deoxidation and processability.</li></ul>
| Element | Content (wt. %) | Remarks |
|---|---|---|
| C | ≤0.12 | |
| Mn | ≤1.00 | |
| P | ≤0.040 | |
| S | ≤0.030 | |
| Si | ≤1.00 | |
| Cr | 16.0–18.0 | |
| Ni | ≤0.75 | |
| Fe | Balance |
ASTM A240 430 Ferritic Stainless Steel Pipe Thermal and Electrical Physical Properties
Typical physical properties for ASTM A240 430 stainless steel at room and elevated temperatures. These values are for reference only and are not part of the standard requirements. <ul><li>Properties are for fully annealed material.</li><li>Thermal conductivity varies with temperature.</li></ul>
| Property | Typical Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.7 | g/cm³ | 20 °C |
| Modulus of Elasticity (E) | 200 | GPa | 20 °C |
| Shear Modulus (G) | 77 | GPa | 20 °C |
| Poisson's Ratio (ν) | 0.27 – 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) | 11.1 | 10^-6/K | 20 – 300 °C |
| Thermal Expansion (α) | 11.4 | 10^-6/K | 20 – 400 °C |
| Thermal Expansion (α) | 11.8 | 10^-6/K | 20 – 500 °C |
| Thermal Conductivity (λ) | 26.1 | W/m·K | at 100 °C |
| Thermal Conductivity (λ) | 23.9 | W/m·K | at 500 °C |
| Specific Heat Capacity (c_p) | 460 | J/kg·K | 0 – 100 °C |
| Electrical Resistivity (ρ_e) | 0.60 | μΩ·m | 20 °C |
ASTM A240 430 Ferritic Stainless Steel Pipe Mechanical Properties
Tensile and hardness requirements for annealed condition per ASTM A240. <ul><li>Values are minimum unless specified as maximum. Hardness values are maximum.</li><li>Elongation requirements vary with thickness; values shown are for strip/sheet.</li></ul>
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (0.2% offset) | ≥205 [30 ksi] | MPa [ksi] | Room temperature, annealed |
| Tensile Strength | ≥450 [65] | MPa [ksi] | Room temperature, annealed |
| Elongation (A) | ≥22 | % | In 2 in. [50 mm], thickness ≤0.1875 in. [4.76 mm] |
| Elongation (A) | ≥18 | % | In 2 in. [50 mm], thickness >0.1875 in. [4.76 mm] |
| Hardness, Rockwell B | ≤89 | HRB | As annealed |
| Hardness, Brinell | ≤200 | HBW | As annealed |
| Bend Test | 180° bend, d = t | Bend diameter equals specimen thickness, no cracks |
ASTM A240 430 Ferritic Stainless Steel Pipe Equivalent Material Standards and Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A240 | 430 (S43000) | Base standard grade |
| Europe | EN 10088-2 | X6Cr17 (1.4016) | Equivalent ferritic stainless steel |
| Japan | JIS G4304 | SUS430 | Widely used equivalent |
| China | GB/T 3280 | 10Cr17 | Chinese equivalent |
| International | ISO 15510 | X6Cr17 | ISO designation, same as EN |
ASTM A240 430 Ferritic Stainless Steel Pipe Application Introduction
ASTM A240 430 stainless steel is widely used in applications requiring moderate corrosion resistance, good formability, and a combination of low cost and magnetic properties. Its ferritic structure provides resistance to stress corrosion cracking in chloride environments, a distinct advantage over austenitic grades. Typical processing includes blanking, bending, deep drawing, and welding (with appropriate filler).
Product Applications: Dishwasher interiors, Automotive exhaust tips and trim, Range hoods and kitchen splashbacks, Refrigerator panels, Architectural cladding and roofing, Cooking utensils and cutlery (non-cutting)
Processed into products: Exhaust system brackets and hangers, Decorative trims and moldings, Stamping parts for appliance doors, Sink bowls, Structural supports in moderate environments
Application industries: Home Appliance, Automotive, Architecture and Construction, Food Service Equipment, Industrial Equipment
ASTM A240 430 Ferritic Stainless Steel Pipe Suggested Similar or Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A240 | 430F (S43020) | Free-machining version with higher sulfur |
| USA | ASTM A240 | 434 (S43400) | Addition of 0.75-1.25% Mo for improved corrosion resistance |
| USA | ASTM A240 | 409 (S40900) | Lower Cr (10.5-11.75%) stabilized with Ti, often used in automotive exhaust |
| Europe | EN 10088-2 | X6CrMo17-1 (1.4113) | Similar to 434 |
| Japan | JIS G4304 | SUS434 | Mo-added grade for better pitting resistance |
Notes:
<strong>Welding Considerations:</strong> Welding can cause grain growth and reduced ductility; post-weld annealing is recommended. Austenitic fillers (e.g., 308L) are often used to maintain joint toughness. <strong>Magnetic Properties:</strong> 430 is ferromagnetic at all temperatures, making it suitable for applications requiring magnetic response. <strong>Corrosion Resistance:</strong> Best in mildly corrosive conditions; not recommended for strong acids or chloride-rich environments without testing.
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