Stainless Steel 430F

Chemical Analysis
C Carbon
Mn Manganese
1.25 max
P Phosphorus
0.060 max
S Sulfur
0.150 min
Si Silicon
1.00 max
Cr Chromium
16.00 – 18.00

General characteristics of Stainless Steel 430F

This alloy, a ferritic stainless steel, is a free-machining version of type 430.

Applications of Stainless Steel 430F

The alloy should be considered when machining is involved. It may be used in screw machines for aircraft parts, gears etc., where the appropriate corrosion resistance is required.

Forging Stainless Steel 430F

The material should be heated to 1500/1600ºF (815/870ºC) then up to forging temperature, 1950/2100ºF (1070/1150ºC) as quickly as possible. The stock should be forged after a minimum of time at forging temperature – to prevent grain growth – and not forged below 1500ºF (815ºC.) Forgings should be air cooled then annealed.

Heat treatment


Heat to 1250/1400ºF (675/760ºC) and air cool. As with type 430, do not soak at temperatures in the range of 700/1000ºF (370/525ºC) to prevent embrittlement due to precipitation of high-chromium ferrite.

This alloy cannot be hardened by heat treatment.


The alloy machines readily and is particularly suited to automatic screw machines.


The alloy is not usually recommended for welding; the high sulfur content may cause hot cracking. If the material must be welded, the use of filler metal is recommended, as is minimum heat input. Post-weld annealing is recommended to restore ductility in the weld metal and the heat-affected zones.


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