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Wikipedia definition
1. Tool steelTool steel refers to a variety of carbon and alloy steels that are particularly well-suited to be made into tools. Their suitability comes from their distinctive hardness, resistance to abrasion, their ability to hold a cutting edge, and/or their resistance to deformation at elevated temperatures (red-hardness). Tool steel is generally used in a heat-treated state.
Read “Tool steel” on English Wikipedia
Read “工具鋼” on Japanese Wikipedia
Read “Tool steel” on DBpedia

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