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Elements (Max.) C Mn P S Si Cr Ni .12 1.00 .040 .030 1.00 16/18 0.75
Type 430 is a 16% straight chromium grade. Due to higher chromium content, its corrosion and heat resisting properties are superior to those of Type 410. This is a tough, ductile, non-hardening grade with good mechanical properties. It is magnetic in all conditions.
Applications: The largest use of Type 430 is in automotive trim and molding. It is also used extensively in interior architectural decorative work, where good corrosion resistance is required. Its heat resisting properties make it suitable for oil refinery equipment and oil-burner parts.
Corrosion Resistance: Type 430 possesses better general corrosion resistance than the lower chromium grades, though notthe high corrosion resistance of the 300 series. It has high resistance to nitric acid as well as sulphur-bearing gases up to its maximums service temperatures.
Resistance To Scaling: Resists scaling in continuous service at temperatures up to approximately 1500 Deg F. Machinability: Type 430 has a machinability rating of approximately 54%, B-1112 rated 100%. Surface cutting speed speed on automatic screw machines is approximately 90 feet per minute.Type 430F has a rating of 92%, with surface cutting speed of 150 feet per minute.
Weldability: Fair welding characteristics, with welds tending to be brittle. Type 430 has low heat conductivity 1/3 that of carbon steel-and a low coefficient of expansion - 10% less than carbon steel. Forming: This grade has fairly good forming and stamping properties. Sheets and strip are suitable for lock seaming in both directions. Forging: Forge between 1850 and 1950 Deg. F. Do not forge below 1400 Deg. F. Annealing: Heat to between 1400 and 1500 F and air cool.