What are the applications of hardness testers in the quenching process of straight seam welded pipes?

Taiwan Nakazawa answers for you:
1. Vickers hardness testers are an important means of testing the surface hardness of heat-treated straight seam welded pipes.
2. Surface Rockwell hardness testers are also very suitable for testing the hardness of surface-quenched workpieces. Surface Rockwell hardness testers offer three scales to choose from. They can test various surface-hardened straight seam welded pipes with an effective hardening depth exceeding 0.1mm. This is of great significance for welded pipe processing and machinery manufacturing plants.
3. When the surface heat-treatment hardened layer is thick, a Rockwell hardness tester can also be used. When the thickness of the heat-treated hardened layer is between 0.4 and 0.8mm, the HRA scale can be adopted; when the hardened layer thickness exceeds 0.8mm, the HRC scale can be adopted.
4. If a part requires high local hardness, local quenching heat treatment can be performed using methods such as induction heating. Such straight seam welded pipes usually need to have the position of the local quenching heat treatment and the local hardness value marked on the drawings. The hardness testing of straight seam welded pipes must be conducted within the designated area. Rockwell hardness testers can be used as the hardness testing instrument to test HRC hardness values; if the heat-treated hardened layer is shallow, a surface Rockwell hardness tester can be used to test HRN hardness values.