Alloy Stainless Steel Plate 309/304 also resists moderately aggressive organic acids such as acetic. The nickel present in the alloy provides resistance to moderately reducing solutions such as pure phosphoric acid, whatever the concentration, in cold solutions and up to 10% diluted hot solutions. The alloy can also operate successfully in caustic solutions free of chlorides or Alloy Stainles Steel Plate 309/304 does not perform well in more highly reducing environments such as those containing chlorides and sulfuric acid.
| Grade | Fe | Cr | Ni | Mn | Si | C | P | S |
| SS 309 | 60% | 23% | 14% | 2% | 1% | 0.20% | 0.045% | 0.030% |
Alloy Stainless Steel Plate 309/304 performs well in fresh water service with low levels of chlorides (less than 100ppm). At higher chloride levels the grade is susceptible to crevice corrosion and pitting. For successful performance under these more severe conditions, higher molybdenum content is need such as 316/316L. Alloy Stainless Steel 309/304 is not recommended for service in marine environments.
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