ASTM A681-08 pdf free.Standard Specification for Tool Steels Alloy. ASTM A681 covers the chemical, mechanical, and physical requirements for available wrought alloy tool steel products. 3. Classification 3.1 Material in accordance with this specification is classifled by chemical composition. Types correspond to respective AISI designations. 3. 1 . I 1-lot Work Tool Steels, Identification H: 3.1.1.1 Types H1O to H...