Testing the MBN Value of G-Type Connecting Rod Bolts The G-type connecting rod bolts produced in our factory are made from 18Cr2Ni4WA steel. To ensure their mechanical performance, we conduct hardness tests after quenching and tempering, with the goal of maintaining the hardness within a specific range. This is crucial to meet the required mechanical properties of the bolts. Given the high annual production volume of these connecting rod bolts, performing hardness tests on a large number of parts in the field can be both time-consuming and labor-intensive. To address this challenge, we have introduced the CTY601 multi-functional magnetoelastic testing device. This tool allows us to test all connecting rod bolts quickly, accurately, and without causing any damage. For bolts that show abnormal MBN values, we perform grinding and then conduct hardness tests (HRC) for verification. This approach not only enables full inspection but also reduces the need for manual labor and resources. It has become a preferred project with significant development potential. Over the past four months, we have continuously tested approximately 150 connecting rod bolts. By comparing the MBN value with the HRC value, we were able to establish a correlation between the two. We also compared the MBN values with sample numbers and cross-referenced them with the HRC measurements taken in the workshop. This helped us understand the relationship between the MBN and HRC values. It's important to note that the test areas differ between the workshop and the testing center. In the workshop, the surface near the bolt’s outer layer tends to be slightly decarburized, leading to lower HRC readings. In contrast, the testing center measures the hardness of the core material, resulting in higher HRC values. As a result, when the MBN value of a batch is high, the corresponding HRC value tends to be low, and vice versa. Moreover, if the MBN value is abnormal, the HRC value often reflects the same issue. This consistency helps us identify potential quality concerns early in the process.
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