430 Stainless Steel Grade
Mar 23, 2026
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Chemical Composition
The table below lists AISI 430 stainless steel composition.
| Type 430 Chemical Composition, % | |||||||||
| ASTM | AISI (UNS) | C, ≤ | Si, ≤ | Mn, ≤ | P, ≤ | S, ≤ | Cr | Ni, ≤ | Product |
| ASTM A240/A240M | 430 (UNS S43000) | 0.12 | 1.00 | 1.00 | 0.040 | 0.030 | 16.0-18.0 | 0.75 | Plate, Sheet, and Strip |
| ASTM A276/A276M | 0.12 | 1.00 | 1.00 | 0.040 | 0.030 | 16.0-18.0 | – | Bars and Shapes | |
ASTM A240/A240M: Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications.
ASTM A276A/A276M: Standard Specification for Stainless Steel Bars and Shapes.
ASTM A580/A580M: Standard Specification for Stainless Steel Wire.
AISI ASTM 430 Stainless Steel Mechanical Properties
The mechanical properties of type 430 stainless steel (SS430) is given in the tables below.
| SS 430 Mechanical Properties | ||||||||
| Type (UNS) | Tensile strength, MPa (ksi), ≥ | Yield strength, MPa (ksi), ≥ | Elongation in 50 mm, %, ≥ | Reduction in area, %, ≥ | Brinell Hardness, ≤ | Rockwell Hardness, ≤ | Cold Bend, ≤ 25 mm (1 in.) | Product form and Condition |
| 430 (UNS S43000) | 415 (60) | 207 (30) | 20 | 45 | – | – | – | Bar, Annealed, hot-finished or cold-finished |
| 450 (65) | 205 (30) | 22 | 183 HBW | 89 HRBW | 180° | Sheet, Plate and Strip | ||
| 485 (70) | 275 (40) | 16 | 45 | – | – | – | Wire, Annealed, Cold finished | |
Physical Properties
The tables below show the physical properties of 430 grade stainless steel (SS430).
| SS 430 Physical Properties | |
| Density, g/cm3 (lb/in.3) | 7.8 (0.28) |
| Melting point, °C (°F) | 1425-1510 (2600-2750) |
| Specific heat capacity, J/kg · K (Btu/lb · °F) | 460 (0.11) at 0-100 °C (32 to 212 °F) |
| Electrical resistivity, μΩ·m | 0.60 at 20 ℃ |
| 430 stainless steel magnetic permeability | 600-1100 (Approximate) |
| Elastic modulus (Modulus of elasticity), GPa (106 psi) | 200 (29.0) |
| Thermal diffusivity, mm2/s | 7.3 |
| Thermal conductivity, W/m · K (Btu/ft · h · °F) | 26.1 (15.1), at 100 ℃ (212 °F) |
| 26.3 (15.2), at 500 ℃ (932 °F) | |
| Coefficient of thermal expansion, μm/m · °C (μin./in. · °F) | 10.4 (5.8), at 0-100 ℃ (32-212 °F) |
| 11.0 (6.1), at 0-315 ℃ (32-600 °F) | |
| 11.4 (6.3), at 0-538 ℃ (32-1000 °F) | |
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