430 Stainless Steel

Description:

Type 430 Stainless Steel is 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.

Product Forms:

Sheet, Strip

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:

ElementType 430
Carbon 0.12 max.
Manganese 1.00 max.
Sulfur 0.030 max.
Phosphorus 0.040 max.
Silicon 1.00 max.
Chromium 16.0 – 18.0
Nickel 0.75 max.

Mechanical Properties:

TypeYield 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/o F/lb.) 32 to 212 oF 0.11
Thermal Conductivity (BTU/hr/ft^2/ft) 212oF 13.8
  932oF 15.0
Mean Coefficient of Thermal Expansion (in. x 10^-6 per o F) 32 to 212oF 5.7
  32 to 932oF 6.2
Electrical Resistivity (micro ohms - cm) at 70oF 60.0
Melting Point Range (oF)   2600 - 2750
Oxidation Resistance - Continuous Service(oF)   1500

Processing:

Type 430 should be annealed at 1450-1550ºF 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.