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在工模具钢发展过程中,寻求更好的强韧性配合是主要的目标,亦就是通过合金化或热处理途径提高钢的韧性以达到强韧性的更高水平,来赢得使用寿命的更大幅度改善。但是过去对工模具钢韧性的要求(或概念)不够明确,评定标准亦欠严格和有效。早前,扭转力矩和变形、扭转冲击、抗弯强度和挠度、无缺口冲击值都曾被用来作为工模具钢的韧性评定依据,Steven则采用R=10～12.5毫米的C型缺口冲击值来衡量韧性。这些评定方法往往存在下列几方面的不足:
In the development of tool steel, to find a better combination of toughness is the main goal, that is, by alloying or heat treatment to improve the toughness of steel to achieve a higher level of toughness, to win more substantial improvements in service life . However, in the past, the toughness of tool steel (or concept) was not clear enough and the evaluation criteria were not rigorous and effective. Earlier, torsional moments and deformations, torsional shocks, flexural strengths and deflections, and unnotched impact values were used as a basis for toughness assessment of tool steel. Steven used C-notched impact values of R = 10 to 12.5 mm To measure toughness. These assessment methods often have the following deficiencies: