The parts made of die steel need surface heat treatment. The hardness tester can accurately measure the die steel under different circumstances, so the hardness tester is essential in hardness testing, but many people don't know much about heat treatment. Now, Jinan die steel editor will introduce the hardness testing after heat treatment.

对于测试表面是0.05的表皮硬化金属，维氏硬度计的测量是精准的。选用0.5100KG的实验力，可直接检测零部件金属表面的硬度差变化。有用硬化层深 度可是维氏硬度计针对的测量对象，如果制作部件需要进行表面热处理加工或大量使用表面热处理工件的单位，那么此类硬度计是必不可少的。

The Vickers hardness tester is accurate for skin hardened metal with a test surface of 0.05. Using the experimental force of 0.5 to 100kg, the change of hardness difference on the metal surface of parts can be directly detected. The depth of useful hardened layer is the measurement object of Vickers hardness tester. If the parts need surface heat treatment or the units of surface heat treated workpieces are widely used, such hardness tester is essential.

如果需要测试有用硬化深 度超过0.1MM的各种表面硬化工件那么可以选用表面洛氏硬度计。尽管表面洛氏硬度计的精度比维氏的偏低，但是针对一般工厂部件的检测水平精度，已经能够满足要求。而且偏低，检测迅速，方便易用是这类产品的优势，利用洛氏硬度计可对成批的表面热处理工件进行快速无损的单件检测。这一点对于金属加工和机械制造工厂带来了非同寻常的便利。

If it is necessary to test various surface hardened workpieces with a useful hardening depth of more than 0.1mm, a surface Rockwell hardness tester can be selected. Although the accuracy of surface Rockwell hardness tester is lower than that of Vickers, the detection level accuracy of General Factory parts can meet the requirements. Moreover, the advantages of this kind of products are low price, rapid detection and easy to use. Rockwell hardness tester can be used for rapid and nondestructive single piece detection of batches of surface heat-treated workpieces. This brings extraordinary convenience to metal processing and machinery manufacturing factories.