The thread inspection of A106B seamless steel tube is complicated, which is divided into thread test and tube thread test.


1. Inspection of collar threads
After steel wire is processed, inner taper, inner pitch, thread height and concentricity are tested, and sealing and comprehensive parameters are checked through thread plug and incomplete head. In addition, the threaded surface is inspected by artificial eye according to API standard.


2. Inspection of pipe threads
Thread, taper, pitch and height are measured. Thread angle is sampled by threading angle microscope. Compact distance and comprehensive parameters are tested by threaded ring and smooth ring gauge. Thread surface is inspected according to API standard. After sleeve coupling test, the machine is tightened with a screw plug instead of a single plug gauge on the screw.
 
The finished product is tested at the end of the package. Before the end of the package, it is tested with threaded plug and concave single plug. The male button is tested with threaded ring and smoothness meter. In practical testing work, proximity distance is a comprehensive parameter, and the single parameter is qualified, which is close to the potential qualified. To shut down from the fault, the unqualified single parameter should be found first, and then the problems in the process of processing should be dealt with according to the influence reasons of the parameter problems.