Summary for anti-galling testing Discussion
Anti-galling testing for black oxide threads on a steel coupling is the core issue here, with the question focused on how to validate performance for API Spec 11b and document a basis for special-process control under ISO 9001/ISO 29001 7.5.2. Robert Freeman explains that the specification does not clearly define a test method; it only says the product must meet the manufacturer’s requirements. The excerpted thread does not include a detailed testing procedure or a final technical recommendation from Lee Gearhart, so the practical takeaway is that the required anti-galling validation appears to depend on the manufacturer’s own established requirements and justification rather than a single API-mandated test. The discussion highlights the need to build a defensible internal basis for the test method if the process is being treated as special.
Q. I am trying to determine the best way to validate (test) the effectiveness of anti-galling (black oxide) of the threads on a coupling made of steel. The test is to satisfy a requirement for API Spec 11b. This specification does not clearly describe the type of testing required. It simply says the product has to meet the manufacturers requirements. While this sounds simple, creating the justification to satisfy 7.5.2 of ISO 9001/ISO 29001 (dealing with special processes) is where the need for a basis for this testing is needed.
Robert Freeman
Management System Consultant – McKinney, Texas, USA
May 31, 2011
A. ASTM G98-17
[affil. link]
is a standard test for galling, describing a button-on-block test using a modified hardness tester to provide a constant load. But you can use other instruments- we use a low load tensile tester, and it seems to work well.
Lee Gearhart
metallurgist – E. Aurora, New York