According to “The Book of Grinding” by CTE Magazine’s Expert: Clarifying definitions is crucial when discussing grinding burn, as different interpretations and overlaps can cause confusion. The concept of grinding burn primarily refers to oxidation burn, which is often mistaken as rust. However, there are four distinct types of thermal damage in steels.
Type 1, often referred to as grinding burn, is simply iron oxide, commonly known as rust, and can be seen with the naked eye. On the other hand, Types 2, 3, and 4, including over-tempering, residual tensile stresses, and rehardening burn (white layer), are not visible to the naked eye and require specific testing methods for detection.
While Type 1 (rust) does not impact the material’s strength, Types 2, 3, and 4, known as genuine thermal damage, can affect the steel’s integrity.
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