The Vickers hardness tester is the most 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 effective hardened layer depth 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.

如果需要测试有效硬化深度超过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 an effective 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.

另外如果表面热处理硬化层较厚时，洛氏硬度计也是不错的选择。采用HRA标尺可测量热处理硬化层厚度在0.4～0.8毫米，如果硬化层厚度超过0.8毫米时，可采用HRC标尺。维氏、洛氏和表面洛氏三种硬度值都适用互相换算，转换成标准、图纸或用户需要的硬度值。

In addition, if the surface heat treatment hardened layer is thick, Rockwell hardness tester is also a good choice. The thickness of heat treatment hardened layer can be measured by HRA scale at 0.4 ~ 0.8mm. If the thickness of hardened layer exceeds 0.8mm, HRC scale can be used. Vickers, Rockwell and surface Rockwell hardness values can be converted into standards, drawings or hardness values required by users.

对于局部热处理的部件，零件局部硬度要求较高，可用感应加热等方式进行局部淬火热处理，这样的零件通常要在图纸上标出局部淬火热处理的位置和局部硬度值。零件的硬度检测要在指定区域内进行。硬度检测仪器可采用洛氏硬度计，测试HRC硬度值，如热处理硬化层较浅，可采用表面洛氏硬度计，测试HRN硬度值。

For the parts with local heat treatment, the local hardness requirements of parts are high, and the local quenching heat treatment can be carried out by means of induction heating. For such parts, the location and local hardness value of local quenching heat treatment shall be marked on the drawing. The hardness test of parts shall be carried out in the designated area. The hardness testing instrument can use Rockwell hardness tester to test HRC hardness value. If the heat treatment hardened layer is shallow, the surface Rockwell hardness tester can be used to test hrn hardness value.

有些人认为淬火出来后，还没有冷却到室温时，不能进入回火工序。实际上很多钢种，尤其低、中碳钢，其马氏体转变终了点大都高于室温，冷到室温时，反而容易开裂，淬火出来后就可以尽快转入回火工序。根据钢种的马氏体转变点来决定淬火之后的回火前的入炉温度！为了防止淬火开裂，不能妄加推测，一概而论的采用带温回火的办法。

Some people think that after quenching, the tempering process cannot be entered when it has not been cooled to room temperature. In fact, the end point of martensitic transformation of many steels, especially low and medium carbon steels, is mostly higher than room temperature. When it is cold to room temperature, it is easy to crack. After quenching, it can be transferred to tempering process as soon as possible. According to the martensitic transformation point of steel grade, the furnace entry temperature before tempering after quenching is determined! In order to prevent quenching cracking, we can't speculate. Generally speaking, the method of tempering with temperature is adopted.

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