|Stainless Steel 430, UNS S43000, SUS430, SUS430F|
|stainless steel 430 Chemical Composition|
|Fe, <0.12% C, 16-18% Cr, <0.75% Ni, <1.0% Mn, <1.0% Si, <0.040% P, <0.030% S|
|Stainless steel 430 properties|
|SUS 430 is a ferritic, straight chromium, non-hardenable grade, combining good corrosion resistance and formability characteristics with useful mechanical properties. Its ability to resist nitric acid attack permits its use in specific chemical applications but automotive trim and appliance components represents its largest fields of application.
SUS 430F is the free-machining version of this grade, available in bar form for use in automatic screw machines. SUS 434 is the molybdenum bearing version of SUS 430 and has the same useful combination of properties. Its molybdenum addition improves corrosion resistance.
|Chemical Composition for SS430 / SS430F grade stainless steel
430 / 430F grade stainless steel Mechanical Properties
Grade Specification Comparison for 430 grade stainless steel
430 stainless steel Corrosion Resistance
SUS430 has good resistance to a wide variety of corrosive media including nitric acid and some organic acids. It attains its maximum corrosion resistance when in the highly polished or buffed condition. In general its resistance to pitting and crevice corrosion resistance is close to that of SUS304. Stress corrosion cracking resistance of SUS430 is very high, as it is for all ferritic grades.
Like other high-sulphur free machining grades 430F has much reduced resistance to pitting and crevice corrosion compared to its non-free machining equivalent, particularly in the cross-section direction.
Is 304 or 430 stainless better?
SS304 is more expensive than SS430 due to the chemical composition, mainly the inclusion of nickel. The presence of nickel makes 304 stainless steel more corrosion resistant; it also makes it much easier to press and draw.