430 is a 16–18%Cr ferritic stainless steel that contains no nickel, so its price is little affected by nickel prices. It is commonly used for appliance panels, tableware, architectural interiors, and automotive trim. Advantages: low cost, resistance to general atmospheric corrosion, good thermal conductivity, and a low coefficient of thermal expansion. Limitations: 1) Formability is inferior to that of austenitic grades; deep drawing is prone to cracking, and the r-value and elongation are limited; 2) After welding, the heat-affected zone undergoes grain coarsening and toughness decreases, so it is not recommended for pressure-bearing or fatigue conditions; 3) The ductile-to-brittle transition at low temperature is pronounced, so it should be used with caution in cold environments; 4) The surface is prone to ridging, and stringent surface requirements demand coordinated material selection and process control. When purchasing, it is advisable to specify the surface grade, forming operations, and whether welding is required, and to avoid applying 304 acceptance standards to 430.