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Stainless Steel 430/ UNS S43000 Technical Data

Alloy 430/ UNS S43000 is ferritic chromium steel, with useful corrosion resistance. It has good formability and fabrication characteristics, although inferior to the austenitic stainless steels. Alloy 430 has useful resistance to heat and oxidation, and is not susceptible to stress corrosion cracking. In most applications the steel is used where the corrosion environment is only mildly aggressive, when it gives long lasting appearance and service life.
The following is technical info. For SS 430.
SS 430 is slightly easier than the austenitic grade 304 to machine, although more difficult than carbon steel. More power is required to machine grade 430 than carbon steel. Cutting speed should be lower, the feed higher, tooling and equipment heavier. The machinability of 430 is about 60% that of AISI B1112 resulphurised free cutting carbon steel.
Grade 430 is one of the easier austenitic stainless steels to forge, at temperatures 850 – 1120°C, finishing at any temperature down to about 705°C. 430 should be annealed after forging.
Heat Treatment:
Solution annealing is performed at 1065 – 1120°C, followed by rapid cooling to prevent the precipitation of the chromium carbides. 430 cannot be hardened by heat treatment.
It is difficult to make a sound structural weld in grade 430 by fusion techniques. The limited phase change at higher temperatures gives coarse ferrite grains with grain boundary martensite films in the HAZ. Precipitation of carbides during cooling also leads to sensitisation. Welds are both brittle and have lowered corrosion resistance. Post weld heat treatment is able to achieve tough, corrosion resistant welds, but the cost may outweigh the cost of using an austenitic grade. The alloy is not used for structures. SS 430 can be joined by spot, seam, and induction welding.
Stainless steel 430( UNS S3000) plates/sheets are available. Welcome to inquiry.

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