Singapore Stainless Steel 430

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Description

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

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

max.

0.12

1.00

1.00

0.040

0.030

16.0

18.0

0.75

SS430F min.

max.

0.12

1.25

1.00

0.06

0.15

16.0

18.0

430 / 430F grade stainless steel Mechanical Properties 

 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

 Grade Specification Comparison for 430 grade stainless steel

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.

 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.
Is stainless steel 430 good?
430 stainless steel is less expensive because it does not contain nickel. These two alloys are chosen for grills and barbeques for a few reasons. They both are food-safe because of their corrosion resistance: in acidic environments, the sus430 is slightly more vulnerable to corrosion, but only with prolonged exposure.
Will a magnet stick to 430 stainless steel?
Austenitic stainless steels like 304 or 316 stainless are good examples of this. A ferritic stainless like 430 stainless steel, on the other hand, is ferromagnetic. Magnets stick to it.