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Type 304L SS is satisfactory for a phosphoric acid concentration of 100% up to about _________.

Type 321 is required from there to 225º F.

A. 140º F
B. 150º F
C. 100º F
D. 120º F

Answer :

Final answer:

Type 304L Stainless Steel is satisfactory for a phosphoric acid concentration of 100% up to 150º F. Beyond this temperature and up to 225º F, Type 321 Stainless Steel is required.

Explanation:

Type 304L SS (Stainless Steel) is satisfactory for phosphoric acid concentration of 100% up to about 150º F. This implies that at temperatures of 150 degrees Fahrenheit and below, 304L stainless steel will provide satisfactory resistance to the corrosive effects of 100% phosphoric acid. In contrast, if the temperature goes beyond 150º F and up to 225º F, a more heat-resistant type of stainless steel, Type 321, is recommended. This is because the enhanced high-temperature properties of Type 321 provide better resistance to the corrosive properties of phosphoric acid at these higher temperatures.

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