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434 Stainless Steel (UNS S43400) is a ferritic, non-hardenable stainless steel that includes molybdenum for enhanced corrosion resistance compared to 430 stainless steel. Known for its excellent resistance to chloride attack, it is ideal for exterior applications where corrosion resistance and good mechanical properties are required.
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| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 16.0 – 18.0 |
| Molybdenum (Mo) | 0.75 – 1.25 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 0.60 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Nickel (Ni) | ≤ 0.50 |
| Iron (Fe) | Balance |
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.74 g/cm³ | 0.280 lb/in³ |
| Modulus of Elasticity | 200 GPa | 29.0 x 10⁶ psi |
| Thermal Expansion | 10.4 µm/m°C | 5.8 x 10⁻⁶ in/in°F |
| Thermal Conductivity | 26.1 W/m·K | 15.1 BTU/hr·ft·°F |
| Specific Heat Capacity | 460 J/kg·K | 0.11 BTU/lb·°F |
| Electrical Resistivity | 60 µΩ·cm | 23.68 µΩ·in |
| Melting Range | 1482 – 1532°C | 2700 – 2790°F |
| Condition | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (Rockwell B) |
|---|---|---|---|---|
| Annealed | 450 – 540 | 205 – 310 | 22 | 89 |
| Property | Metric | Imperial |
|---|---|---|
| Electrical Resistivity | 60 µΩ·cm | 23.68 µΩ·in |
| Property | Metric | Imperial |
|---|---|---|
| Thermal Conductivity | 26.1 W/m·K | 15.1 BTU/hr·ft·°F |
| Specific Heat Capacity | 460 J/kg·K | 0.11 BTU/lb·°F |
| Melting Range | 1482 – 1532°C | 2700 – 2790°F |
| Product Type | Standards | Sizes | Types | Applications |
|---|---|---|---|---|
| Sheets & Plates | ASTM A240, A480 | Thickness: 1.5mm – 50mm | Hot Rolled, Cold Rolled | Automotive trim, kitchenware, roofing |
| Pipes & Tubes | ASTM A268, A249 | Diameter: 6mm – 1200mm | Seamless, Welded | Chemical processing, food equipment |
| Bars | ASTM A276 | Diameter: up to 100mm | Round, Square, Hex | Fasteners, bolts, screws |
| Angles, Channels, Beams | ASTM A484 | Custom sizes available | L-Angles, U-Channels, I-Beams | Structural support, decorative applications |
| Fittings | ASTM A403 | Size: 1/2″ – 72″ | Buttweld, Socket Weld | Oil refinery equipment, restaurant hardware |
434 Stainless Steel is often selected for applications where resistance to chlorides and slightly acidic conditions is necessary, including:
While 430 Stainless Steel provides adequate corrosion resistance for general uses, 434 Stainless Steel offers enhanced resistance to chloride and sulfur exposure due to its molybdenum content. This makes 434 a preferred choice for environments prone to salt exposure and for applications that require slightly better durability than 430.
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