Home / Resources / Alloy Info & Tech Sheets / Type 430 Stainless Steel
Alloy Technical Data Sheet
Type 430 Stainless Steel
Ferritic Stainless Steel · UNS S43000
Economical low-carbon ferritic stainless — magnetic, ductile and oxidation resistant, with corrosion resistance approaching that of some nickel-bearing stainless steels in mild environments.
General Properties
Type 430 is a low-carbon ferritic stainless steel. In mildly corrosive environments or atmospheric exposures, its corrosion resistance approaches that of some nickel-bearing stainless steels. It is also oxidation resistant at elevated temperatures.
It is ductile, does not work-harden readily, and can be formed using a variety of roll forming or mild stretch bending operations, as well as the more common drawing and bending processes. It is chosen where economy and corrosion resistance matter more than high strength — appliance and interior trim, sinks and sink rims, range hoods, dishwashers, flatware, restaurant equipment and architectural parts.
Chemical Composition
| Element | 430 |
|---|---|
| Carbon | 0.12 |
| Manganese | 1.00 |
| Phosphorus | 0.040 |
| Sulfur | 0.030 |
| Silicon | 1.00 |
| Chromium | 16.00–18.00 |
| Nickel | 0.75 |
| Iron | Balance |
Mechanical Properties
| Property | Type 430 |
|---|---|
| Tensile strength, ksi (MPa) | 65 (450) |
| 0.2% Yield strength, ksi (MPa) | 30 (205) |
| Elongation in 2″ (51 mm), % | 22 |
| Hardness, max. | Rockwell B89 / Brinell 183 |
| Property | .020–.060″ | .040–.115″ |
|---|---|---|
| 0.2% Yield, ksi | 44–54 | 43–56 |
| Tensile, ksi | 70–79 | 66–78 |
| Elongation in 2″, % | 21–34 | 23–37 |
| Hardness | 62–70 (30T) | B75–83 |
Fatigue strength (10⁷ cycles) is about 35–45% of tensile strength. Data are typical and do not necessarily represent minimum or maximum values. Each lot may vary.
Physical Properties
| Melting range | 2600–2750 °F (1425–1510 °C) |
|---|---|
| Density | 0.278 lb/in³ (7.70 g/cm³) |
| Specific gravity | 7.70 |
| Modulus of elasticity (tension) | 29 × 10⁶ psi (200 GPa) |
| Specific heat, 32–212 °F | 0.11 Btu/lb·°F (460 J/kg·K) |
| Magnetic | Yes — ferromagnetic |
Thermal Expansion
| °F | °C | in/in/°F | cm/cm/°C |
|---|---|---|---|
| 68–212 | 20–100 | 5.7 × 10⁻⁶ | 10.3 × 10⁻⁶ |
| 68–932 | 20–500 | 6.2 × 10⁻⁶ | 11.2 × 10⁻⁶ |
| 68–1450 | 20–787 | 6.6 × 10⁻⁶ | 11.9 × 10⁻⁶ |
Lower expansion than the austenitic 300 series — closer to carbon steel.
Thermal Conductivity
| °F | °C | Btu/hr·ft·°F | W/m·K |
|---|---|---|---|
| 68–212 | 20–100 | 13.8 | 23.9 |
| 68–932 | 20–500 | 15.0 | 26.0 |
Electrical Resistivity
| °F | °C | Microhm-in | Microhm-cm |
|---|---|---|---|
| 68 | 20 | 23.6 | 60.0 |
| 212 | 100 | 26.6 | 67.5 |
| 392 | 200 | 30.3 | 77.0 |
| 752 | 400 | 36.4 | 92.5 |
| 1112 | 600 | 41.3 | 105.0 |
| 1472 | 800 | 45.3 | 115.0 |
Corrosion & Oxidation Resistance
Type 430 resists a wide variety of corrosive media, including nitric acid and many organic acids. Resistance is best with a highly polished or bright-annealed surface.
It resists oxidation up to about 1600 °F (870 °C) in intermittent service and 1450–1500 °F (790–815 °C) in continuous service, forming a tightly adherent scale that holds up to sudden temperature changes.
Structure & Heat Treatment
Below about 1650 °F (900 °C) the structure is ferritic with dispersed chromium carbides. Heating above that temperature forms small amounts of austenite that may transform to martensite on cooling — typically in welds and heat-affected zones — which annealing converts back to ferrite and carbides. Long holds at 800–1000 °F (425–540 °C) reduce impact toughness; annealing restores it.
Values are typical or specification minimums as noted, provided for information only, and should not be used as design limits or as a guarantee of properties for any particular lot or application. Certified test reports are supplied with each order.Rev. 10/2026