A) copper
B) nickel and chromium
C) manganese
D) zinc
Correct Answer: B
Solution :
When steel is alloyed with atleast one metal like nickel, chromium, vanadium manganese, Co etc. alloy steel is obtained. Some Alloy Steels| Alloy steel | Special component | Chief property | Uses | |
| 1. | Stainless steel | Cr 18%, Ni 8% | does not rust | for household utensils |
| 2. | Nickel steel | Ni = 3.5% | hard, flexible, rust resistant | for cables, armour plates |
| 3. | Chrome- vanadium steel | Cr = 1% V = 0.15% | tenacious and load bearing | for axles, springs and cog wheels |
| 4. | Manganese steel | Mn = 12% -15% | Extremely hard, high mp | for rock crusher, burglar proof safes |
| 5. | Tungsten steel | W = 14- 20% Cr = 3 - 8% | very hard, strong | for cutting tools |
| 6. | Invar | Ni = 36% | extremely low, expansion on heating | For clock pendulums |
| 7. | Alnico | Al = 12% Ni = 20% Co = 5% | highly magnetic | for permanent magnets |
| 8. | Chrome steel | Cr = 1.5- 2.0% | high tensile strength | cutting tools, cutery |
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