這是ANSI H35.1的解釋，國內大多沿襲該標準。我翻譯了一點，但是我覺得還是看原文對理解有幫助！The first digit following the H indicates the specific combination of basic operations, as follows:H后邊第一個數字表明基體中的特殊化合物，如下：H1 strain-hardened only. Applies to products that are strain-hardened to obtain the desired strength without supplementary thermal treatment. The number following this designation indicates the degree of strain-hardening.H1 應變硬化 指經過僅應變硬化無其他附帶熱處理獲得設計強度的產品狀態。該符號后續的數字表示應變硬化的程度。H2 strain-hardened and partially annealed. Applies to products that are strain-hardened more than the desired final amount and then reduced in strength to the desired level by partial annealing. For alloys that age-soften at room temperature, the H2 tempers have the same minimum ultimate tensile strength as the corresponding H3 tempers. For other alloys, the H2 tempers have the same minimum ultimate tensile strength as the corresponding H1 tempers and slightly higher elongation. The number following this designation indicates the degree of strain-hardening remaining after the product has been partially annealed.H2 應變硬化加不完全回火 指經過應變硬化后再經不完全回火調整降低強度以得到設計強度的產品狀態。對于室溫下柔性合金，H2狀態有與H3狀態相同的極限抗拉強度。對于其他合金，H2狀態有與H1狀態相同的極限抗拉強度和稍高的延伸率。該符號后續的數字表示經過不完全回火后的應變硬化程度。