1.1本规范涵盖了通过直接浇注到合适模具中铸造的可用形状以及用于重熔和铸造的主炉的工具钢成分。 注1-主炉系指经认证分析的任何一炉钢，其已加工成合适的形式（丸、锭等）用于重熔。主炉的均匀混合也可用于重熔。该混合物被定义为主加热批次，其平均化学成分应经过认证。 1.2本规范涵盖九个等级，CA-2、CD-2、CD-5、CM-2、CS-5、CS-7、CH-12、CH-13和CO-1。 注2:制定本规范的委员会包括广泛使用的工具钢的空气和油硬化等级。如有需要，可考虑加入其他成分。

1.1 This specification covers tool steel compositions for usable shapes cast by pouring directly into suitable molds and for master heats for remelting and casting. Note 1-A master heat is defined as any single heat of steel of certified analysis which has been processed into suitable form (shot, ingot, etc.) for remelting. A uniform blend of master heats is also acceptable for remelting. This blend is defined as a master heat lot and its average chemical composition shall be certified. 1.2 Nine grades, CA-2, CD-2, CD-5, CM-2, CS-5, CS-7, CH-12, CH-13, and CO-1, are covered in this specification. Note 2-The committee formulating this specification has included air- and oil-hardening grades of tool steel that have been extensively used. Other compositions will be considered for inclusion as the need arises.