Weight Percent

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Composition & Alloying

Definition

A method of expressing alloy composition as the mass of a constituent element divided by the total mass of the alloy, multiplied by 100. It is the most common way to specify alloy chemistry in industry.

Detailed Explanation

For example, 316 stainless steel contains 16–18 wt% chromium, 10–14 wt% nickel, and 2–3 wt% molybdenum. Weight percent is preferred in practical metallurgy because raw materials are measured by weight, whereas atomic percent is more useful for understanding phase diagrams and bonding. Converting between the two requires knowledge of the atomic weights of each element.