Principal Design Features
A basic ferritic non-heat treatable stainless steel. Its strengths are in ductility, formability, good corrosion and oxidation resistance, thermal conductivity and finish quality.
Machinability
Rated at 60 % of B1112. Relatively easily machined in all common procedures. Grade 430 is easier to machine than the standard austenitic grades such as 304, 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 430F, the free machining version of 430, is very much easier to machine.
Forming
Similar in forming characteristics to 304 stainless steel without the same degree of ductility. It does not, however, work harden greatly
Fabrication
The lower work hardening rate makes bending and forming somewhat easier than for grade 304, but the lower ductility restricts very severe operations. Wherever possible severe bends should be made with the bend axis at right angles to the rolling direction. Severe cold heading of 430 wire is possible.
If very severe cold working is required it may be necessary to carry out a sub-critical intermediate anneal.
