Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than ?
Correct answer: C. 20
- A. 5
- B. 10
- C. 20
- D. 35
Explanation
Brasses containing more than about 20% zinc are especially prone to season cracking when residual tensile stress is present. Atmospheric ammonia and similar corrosive agents then promote cracking along the stressed regions.
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