NACE Nitriding: Understanding Case Depth Measurement Criteria

Introduction

The question relates to NACE MR0175/ISO 15156-2:2015 A.2.1.5, which limits the maximum allowable case depth for nitriding to 0.006″”. However, NACE MR0175/ISO 15156 does not define case depth, and there are different ways to define it. This article aims to clarify the measurement criteria for case depth and provide insights into complying with NACE MR0175.

Measurement Criteria for Case Depth

The question asks which definition is intended here, including the total case depth determined by metallographic analysis, the effective case depth based on a difference of 50 HV between core and case, the effective case depth based on a difference of 10% between core and case, the effective case depth based on manufacturer specification of case hardness criteria, or some other definition.

Unfortunately, NACE MR0175/ISO 15156 does not define the measurement criteria for case depth, and adding a definition would require a ballot. Therefore, it is up to the manufacturer or user to define the measurement criteria for case depth.

Complying with NACE MR0175

At our company OGC Energy, we have experience with nitriding and complying with NACE MR0175. We understand the importance of defining the measurement criteria for case depth and ensuring that the nitriding process meets the requirements. If you have any questions or concerns about NACE MR0175 compliance, please contact us for further discussion.

Conclusion

In conclusion, NACE MR0175/ISO 15156 does not define the measurement criteria for case depth, and it is up to the manufacturer or user to define it. At OGC Energy, we have experience with nitriding and complying with NACE MR0175, and we are here to help you with any questions or concerns you may have.