Views:3 Author:Site Editor Publish Time: 2020-07-27 Origin:Site
(1) Geometric standard inspection of steel pipe
The outer diameter, wall thickness, curvature, and length of the steel pipe can be inspected on the inspection table with an external caliper, a micrometer, a bending ruler, and a length tape measure.
Automatic standard testing equipment (such as automatic diameter measurement, thickness measurement, and length measurement equipment) can also be used for continuous testing of outer diameter, wall thickness and length. The steel pipe production plants put into operation in the late 1980s generally have online automatic diameter and thickness measurement equipment, and length measurement and weighing equipment in the finishing area. Regarding OCTG steel pipe, thread parameters need to be checked.
(2) Inspection of the inner and surface of the steel pipe
Generally, visual inspection is used to inspect the front and back surfaces. In addition to visual inspection, reflective prisms can also be used to inspect the inner surface. Some special purpose steel pipes also require non-destructive testing, including eddy current, magnetic flux leakage, ultrasonic, magnetic particle testing, etc., to inspect the quality of the inner and surface of the steel pipe.
(3) Mechanical function and process function inspection
In order to verify that the mechanical function of the steel pipe satisfies the requirements of the standard, it is necessary to sample the steel pipe for mechanical function inspection.
The mechanical function inspection mainly includes tensile strength, yield strength, elongation, impact energy, etc. Process function inspection mainly includes flattening test, flaring test, hydraulic test, crimping test, cold bending test, perforation test, etc. These inspection items are selected according to different standards and different uses of steel pipes.
(4) Non-destructive testing
Non-destructive testing refers to the direct inspection of internal and surface defects without damaging the steel pipe. Now, magnetic flux leakage testing, ultrasonic testing, eddy current and fluorescent magnetic particle testing are widely used in steel pipe enterprises. In recent years, non-destructive testing methods have been greatly expanded. Recently, new technologies such as acoustic emission holography, ultrasonic spectrum analysis testing, ultrasonic imaging testing and ultrasonic high-temperature testing have been presented.