Stainless Steel 430

Unique alloys for extreme environments

With a vast knowledge of metallurgy and the largest stock in Asia, we offer everything from pure titanium alloys for medical applications to nickel-chromium for gas turbines and Oil Field. We are highly focused on offering alloys that with their unique characteristics can handle extreme environments of all sorts.


Stainless Steel 430, UNS S43000, SUS430, SUS430F, SS430
 430 stainless steel Chemical Composition

Fe, <0.12% C, 16-18% Cr, <0.75% Ni, <1.0% Mn, <1.0% Si, <0.040% P, <0.030% S

What is SS430?

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

Grade C Mn Si P S Cr Mo Ni N
SS430 min.










SS430F min.









Mechanical Properties of 430 / 430F grade stainless steel

 Grade Tensile Strength (MPa) min Yield Strength 0.2% Proof (MPa) min Elongation (% in 50mm) min Hardness
Rockwell B (HR B) max Brinell (HB) max
SS430 450 205 22 89 183
SS430F 552 typical 379 typical 25 typical 262

  430 stainless steel equivalent & Specification Comparison

Grade UNS No Old British Euronorm Swedish SS Japanese JIS
BS En No Name
SS430 S43000 430S17 60 1.4016 X8Cr17 2320 SUS 430
SS430F S43020 1.4104 X12CrMoS17 2383 SUS 430F
These comparisons are approximate only. The list is intended as a comparison of functionally similar materials not as a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted.


Is 430 stainless steel rust proof?

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?

304 is more expensive than 430 due to the chemical composition, mainly the inclusion of nickel. The presence of nickel makes 304 more corrosion resistant; it also makes it much easier to press and draw.