硬度计在直缝焊管淬火处理中应用
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是一种硬度测试仪器，金属硬度测量由雷奥姆尔提出硬度定义，表示材料抵抗硬物体压入其表面的能力。它是金属材料的重要性能指标之一。一般硬度越高，耐磨性越好。
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直缝焊管表面淬火回火热处理通常用感应加热或火焰加热的方式进行。主要技术参数是表面硬度、局部硬度和有效硬化层深度。硬度检测可采用维氏硬度计，也可采用洛氏或表面洛氏硬度计。试验力（标尺）的选择与有效硬化层深度和直缝焊管表面硬度有关。这里涉及到三种硬度计。
1、维氏硬度计是测试热处理直缝焊管表面硬度的重要手段。
2、表面洛氏硬度计也是十分适于测试表面淬火工件硬度的，表面洛氏硬度计有三种标尺可以选择。可以测试有效硬化深度超过0.1mm的各种表面硬化直缝焊管。这一点对于湖缝焊管加工和机械制造工厂具有重要意义。
3、当表面热处理硬化层较厚时，也可采用洛氏硬度计。当热处理硬化层厚度在0.4～0.8mm时，可采用HRA标尺，当硬化层厚度超过0.8mm时，可采用HRC标尺。
4、零件如果局部硬度要求较高，可用感应加热等方式进行局部淬火热处理，这样的直缝焊管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。直缝焊管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。
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