Type 430 is a 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 represents its largest field of applications.

Type 430 F is athe free-machining version of this grade designed for use in parts produced in automatic screw machines.

AISI Type 434 is the molybdenum bearing version of Type 430 and has the same useful combination of properties. its molybdenum addition improves corrosion resistance particularly to road salt attack in automotive trim applications. AISI Type 436 is another version of 430. It contains columbrium, as well as the molybdenum addition, to improve the serface appearance of sreatched and drawn parts.

Corrision Resistance:
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.

Heat Resistance:
Resists oxidation in intermettent service up to 1600 degrees F and to 1500 degrees F in continuous service. This grade may become brittle at room temperature after prolonged heating in the 750-1100 degrees F range. This can be eliminated by annealing.

Heat Treatment:
Annealing - Heat to 1500-1550 degrees F, hold for 1/2 hour per inch of thickness, slow furnace cool to 1100 degrees F and then quickly air cool. Sub Critical Anneal - Heat to 1400-1500 degrees F and then air cool. This grade is not hardenable by thermal treatment.

Welding:
If welding is neseccary...preheat at 300-400 degrees F. Embrittlement in the weld metal and heat affected zone can be relieved by a post-anneal but grain refinement will not occur. Use Type 430, 308, 309 or 310 filler rod.

Typical Applications:
Automotive trim
Lashing wire
Element supports
Stove trim rings
Fasteners
Chimney liners