|Stainless Steel – Grade 430, UNS S43000, SUS430, SUS430F|
|ss 430f 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 430F stainless steel?|
|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.
|430f stainless steel chemical Composition
stainless steel 430f Properties
430f stainless steel equivalent
430f 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.
Can 430 stainless steel be hardened?
Solution Annealing – Heat to 815-845°C, hold for ½ hour per 25mm of thickness, slow furnace cool to 600°C and then quickly air cool. Slow cooling from 540-400°C will cause embrittlement.
Sub-Critical anneal – Heat to 760-815°C and then air cool or water quench.
This grade is not hardenable by thermal treatment.
Note that SUS430 is likely to scale more heavily at elevated temperatures than SUS304, and the scale produced is more difficult to remove by pickling.
If welding is necessary pre-heat at 150-200°C. Embrittlement in the weld metal and heat affected zone can be relieved by a post-weld anneal at 790-815°C, but grain refinement will not occur. Use Grade SS430, SS308L, SS309 or SS310 filler rod, depending upon application. AS 1554.6 pre-qualifies welding of Grade SS430 with Grade SS309 filler rods and electrodes.
Machining of sus430 vs sus430f
Grade SUS430 is easier to machine than the standard austenitic grades such as SUS304, but there is still a tendency for galling and pick-up on the cutting tool. Bars that have been lightly drawn are easier to machine than those in the annealed condition. Grade SUS430F, the free machining version of SUS430, is very much easier to machine.