Type 430 Stainless Steelis a low carbon ferritic stainless steel
which, in mildly corrosive environments or atmospheric exposures,
has corrosion resistance approaching that of some nickel-bearing
stainless steels. This alloy is oxidation resistant at elevated
temperatures. Type 430 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. Type 430 is ferromagnetic.
Specifications
ASTM A240
Typical Applications
Sinks, sink rims, appliance trim, counter tops, dish washers, range
hoods, flatware, architectural uses, roofing, siding and restaurant
equipment.
Chemical Composition
Element | Type 430 |
Carbon | 0.12 max. |
Manganese | 1.00 max. |
Sulfur | 0.030 max. |
Phosphorus | 0.040 max. |
Silicon | 0.75max. |
Chromium | 16.0 18.0 |
Nickel | 0.60max. |
Mechanical Properties
Type | Yield Strength 0.2% offset (KSI) | Tensile Strength (KSI) | % Elongation (2" Gauge length) | Hardness Rockwell |
430 Ann | 30 min. | 65 min. | 22 min | HRB 89 |
Physical Properties
Density (lb./ in^2) @ RT | | 0.278 |
Modulus of Elasticity in Tension (psi x 10^6) | | 29.0 |
Specific Heat (BTU/°F/lb.) | 32 to 212 °F | 0.11 |
Thermal Conductivity (BTU/hr/ft^2/ft) | 212°F | 13.8 |
| 932°F | 15.0 |
Mean Coefficient of Thermal Expansion (in. x 10^-6 per °F) | 32 to 212°F | 5.7 |
| 32 to 932°F | 6.2 |
Electrical Resistivity (micro ohms - cm) | at 70°F | 60.0 |
Melting Point Range (°F) | | 2600 - 2750 |
Oxidation Resistance - Continuous Service(°F) | | 1500 |
Processing
Type 430 should be annealed at 1450-1550F and furnace cooled at a
rate of 50°F per hour to 1100°F and air cooled. If the annealing
temperature does not exceed 1450°F (790°C), an air cool may be
substituted for the furnace cool when annealing thin sections.
Forming
Type 430 is readily drawn and formed. Its drawing characteristics
are similar to those of low-carbon steel, although it is stronger
in the annealed condition and will require stronger tooling and
increased power.
Welding
Type 430 is generally considered to be weldable by the common
fusion and resistance techniques. Special consideration is required
to avoid brittle weld fractures during fabrication. When a weld
filler is needed, AWS E/ER 308L and 430 are most often specified.
Corrosion: This alloy is resistant to attack in a wide variety of
corrosive media including nitric acid, and many organic acids.
