Difficulty: Easy
Correct Answer: All of these
Explanation:
Introduction / Context:Selecting the proper abrasive is critical for grinding efficiency and surface integrity. Aluminium oxide is the most widely used abrasive for ferrous materials because it fractures in a controlled way and resists chemical reaction with iron at grinding temperatures.
Given Data / Assumptions:
Concept / Approach:Aluminium oxide is preferred for steels and wrought iron. Silicon carbide, in contrast, is harder but more brittle and is preferred for non-ferrous metals, hard carbides, and cast iron of certain grades. Therefore, for the list of ferrous materials provided, aluminium oxide is suitable for all.
Step-by-Step Solution:
Identify the work materials: all are ferrous and ductile relative to abrasives.Match abrasive to material: Al2O3 for steel and wrought iron.Conclude that all listed materials suit Al2O3 wheels.Select “All of these”.Verification / Alternative check:Manufacturer catalogs recommend Al2O3 for tool steels (including HSS), plain carbon steels, and wrought iron products.
Why Other Options Are Wrong:Limiting the choice to any single listed material understates the broad applicability of aluminium oxide to ferrous metals.
Common Pitfalls:Confusing aluminium oxide with silicon carbide applications; mixing up the role of grit size with abrasive type.
Final Answer:All of these
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