Question:
Which of the following element is not present in AISI 304 but present in AISI 316 Stainless steel ?
Which of the following element is not present in AISI 304 but present in AISI 316 Stainless steel ?
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AISI 316 is often referred to as "marine-grade" or "acid-resistant" stainless steel due to the addition of molybdenum, which protects against chloride corrosion.
Updated On: Jul 21, 2026
- Chromium
- Molybdenum
- Nickel
- Carbon
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Austenitic stainless steels are widely used in the dairy and food processing industries due to their excellent corrosion resistance and cleanability.
The most common grades used are AISI 304 and AISI 316.
Step 2: Detailed Explanation:
Let us compare the chemical compositions of the two grades:
- AISI 304 (standard $18/8$ stainless steel) contains approximately \( 18\% \) chromium and \( 8\% \) nickel, along with iron and carbon.
- AISI 316 contains chromium and nickel, but also incorporates Molybdenum (typically \( 2\% \) to \( 3\% \)) in its alloy matrix.
The addition of molybdenum significantly enhances the material's resistance to pitting and crevice corrosion in chloride-rich environments, which is highly beneficial when processing salted dairy products or using chlorinated sanitizers.
Therefore, molybdenum is present in AISI 316 but absent in AISI 304.
Step 3: Final Answer:
The element present in AISI 316 but not in AISI 304 is Molybdenum.
Austenitic stainless steels are widely used in the dairy and food processing industries due to their excellent corrosion resistance and cleanability.
The most common grades used are AISI 304 and AISI 316.
Step 2: Detailed Explanation:
Let us compare the chemical compositions of the two grades:
- AISI 304 (standard $18/8$ stainless steel) contains approximately \( 18\% \) chromium and \( 8\% \) nickel, along with iron and carbon.
- AISI 316 contains chromium and nickel, but also incorporates Molybdenum (typically \( 2\% \) to \( 3\% \)) in its alloy matrix.
The addition of molybdenum significantly enhances the material's resistance to pitting and crevice corrosion in chloride-rich environments, which is highly beneficial when processing salted dairy products or using chlorinated sanitizers.
Therefore, molybdenum is present in AISI 316 but absent in AISI 304.
Step 3: Final Answer:
The element present in AISI 316 but not in AISI 304 is Molybdenum.
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