Mechanical Engineering Exam > Mechanical Engineering Questions > 18/8 steel containsa)18% nickel and 8% chromi...
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18/8 steel contains
- a)18% nickel and 8% chromium
- b)18% chromium and 8% nickel
- c)18% nickel and 8% vanadium
- d)18% vanadium and 8% nickel
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
18/8 steel containsa)18% nickel and 8% chromiumb)18% chromium and 8% n...
18/8 steel is a type of stainless steel that contains 18% chromium and 8% nickel. Stainless steel is an alloy of iron that contains a minimum of 10.5% chromium. The addition of chromium and other elements like nickel, vanadium, and molybdenum enhances the corrosion resistance and strength of the steel.
Explanation:
1. Composition of 18/8 steel:
- Chromium (Cr): 18%
- Nickel (Ni): 8%
2. Role of chromium in stainless steel:
- Chromium is the main alloying element in stainless steel.
- It forms a passive oxide layer on the surface of the steel, which provides excellent corrosion resistance.
- The oxide layer acts as a protective barrier against corrosion, preventing the steel from rusting.
- It also enhances the steel's resistance to high temperatures, oxidation, and scaling.
3. Role of nickel in stainless steel:
- Nickel is added to stainless steel to improve its strength and toughness.
- It increases the steel's ductility and impact resistance.
- Nickel also enhances the steel's ability to withstand extreme temperatures and maintain its mechanical properties.
- It improves the steel's resistance to corrosion and oxidation, especially in acidic environments.
4. Other elements in stainless steel:
- Vanadium is sometimes added to stainless steel to improve its strength and wear resistance.
- Molybdenum is another common alloying element in stainless steel, which enhances its corrosion resistance and high-temperature strength.
5. Properties of 18/8 steel:
- The addition of 18% chromium provides excellent corrosion resistance, making it suitable for various applications where corrosion is a concern.
- The presence of 8% nickel improves the steel's strength, toughness, and resistance to high temperatures.
- 18/8 steel is widely used in kitchen utensils, cookware, food processing equipment, and architectural applications.
In conclusion, 18/8 steel contains 18% chromium and 8% nickel. The chromium provides excellent corrosion resistance, while nickel enhances the steel's strength and toughness. This composition makes 18/8 steel suitable for a wide range of applications where corrosion resistance and mechanical properties are essential.
Explanation:
1. Composition of 18/8 steel:
- Chromium (Cr): 18%
- Nickel (Ni): 8%
2. Role of chromium in stainless steel:
- Chromium is the main alloying element in stainless steel.
- It forms a passive oxide layer on the surface of the steel, which provides excellent corrosion resistance.
- The oxide layer acts as a protective barrier against corrosion, preventing the steel from rusting.
- It also enhances the steel's resistance to high temperatures, oxidation, and scaling.
3. Role of nickel in stainless steel:
- Nickel is added to stainless steel to improve its strength and toughness.
- It increases the steel's ductility and impact resistance.
- Nickel also enhances the steel's ability to withstand extreme temperatures and maintain its mechanical properties.
- It improves the steel's resistance to corrosion and oxidation, especially in acidic environments.
4. Other elements in stainless steel:
- Vanadium is sometimes added to stainless steel to improve its strength and wear resistance.
- Molybdenum is another common alloying element in stainless steel, which enhances its corrosion resistance and high-temperature strength.
5. Properties of 18/8 steel:
- The addition of 18% chromium provides excellent corrosion resistance, making it suitable for various applications where corrosion is a concern.
- The presence of 8% nickel improves the steel's strength, toughness, and resistance to high temperatures.
- 18/8 steel is widely used in kitchen utensils, cookware, food processing equipment, and architectural applications.
In conclusion, 18/8 steel contains 18% chromium and 8% nickel. The chromium provides excellent corrosion resistance, while nickel enhances the steel's strength and toughness. This composition makes 18/8 steel suitable for a wide range of applications where corrosion resistance and mechanical properties are essential.
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Community Answer
18/8 steel containsa)18% nickel and 8% chromiumb)18% chromium and 8% n...
18/8 stainless steel is nominally 18% chromium and 8% nickel, with the remainder being mainly iron; it does however also contain other elements, but at very low levels. It is also known as 302 or 304 grade stainless steel.
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