本报告中的信息涵盖了与SAE J438《工具和模具钢》相关的数据，旨在作为选择最适合预期用途的钢的指南，并提供推荐的热处理和其他与其使用相关的数据。由于大多数工具钢和模具钢由买方加工或进行特殊热处理，因此不包括物理性能的具体要求。买方可选择或不选择将随附数据用于规范目的。

The information in this report covers data relating to SAE J438, Tool and Die Steels, and is intended as a guide to the selection for the steel best suited for the intended purpose and to provide recommended heat treatments and other data pertinent to their use. Specific requirements as to physical properties are not included because the majority of tool and die steels are either worked or given special heat treatments by the purchaser. The purchaser may or may not elect to use the accompanying data for specification purposes.