AMS2759/1 回火保温时间理解

混在西北

各位大师：

AMS2759/1  
3.4.8 Tempering
When required, tempering shall be accomplished by heating quenched parts to the set temperature required to produce the stated properties. Parts should be tempered within 2 hours of quenching. Suggested tempering temperatures for specific tensile strengths and hardnesses for each alloy and quenchant are shown in Table 3. Alternate tempering temperatures for specific alloys, based on as-quenched hardness, are shown in Table 4. Soaking time shall be not less than 2 hours plus 1 hour additional for each inch (25 mm) of thickness or fraction thereof greater than 1 inch (25 mm)


怎么理解 Soaking time shall be not less than 2 hours plus 1 hour additional for each inch (25 mm) of thickness or fraction thereof greater than 1 inch (25 mm).

回火保温时间：厚度1inch(25mm) 以下是不是 2小时够了。
                       厚度1inch（25mm）以上 直接2+1小时 每inch（25mm） ？

混在西北

1.5INCH, 是不是应该3小时.