What is a Class vs Grade? : Add to Protocol Booklet

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Grade:

• Grade typically refers to the specific alloy composition and quality of a metal. It indicates the chemical makeup and physical properties of the material.
• In metals, different grades have distinct compositions and properties tailored for specific applications or performance requirements.
• For example, in stainless steel, different grades like 304, 316, and 430 have varying compositions of elements such as chromium, nickel, and carbon, which result in different levels of corrosion resistance, strength, and other properties.

Class:

• Class usually denotes a set of specifications or standards that define certain characteristics or performance criteria of the metal.
• Classes may encompass factors such as mechanical properties, dimensional tolerances, surface finish, or specific manufacturing processes.
• In some cases, class distinctions may be used to categorize materials based on their intended use or application requirements.
• For instance, in fasteners like bolts or screws, classes often signify the strength or performance level of the fastener according to standards such as ASTM or SAE. For example, a "Class 8.8" bolt indicates a specific strength rating and material composition according to the relevant standard.