前言 世界上各主要产钢国家生产的工具钢,多则近200种,少则50～60种。我国纳标的工具钢也有51种,品种繁多,使用者眼光瞭乱。往往选用不当,使所制工具达不到理想的要求或使钢材不能物尽其用。 根据国外众多工模具生产厂商长时间的实践经验证实。表一所列工具钢,依据它们 Preface The world’s major steel producing tool steel, as many as nearly 200 species, ranging from 50 to 60 species. There are 51 kinds of tool steel in our country, with a wide variety of users’ eyes. Often used improperly, so that the tools do not meet the desired requirements or to make the best use of steel can not. According to a large number of foreign mold manufacturers confirmed a long time of practical experience. The tool steels listed in Table I are based on them