If we want the quality of
seamless tube(SMLS) to meet the standard, we must verify it through some testing methods. Do you know what are the quality inspection methods for seamless steel tubes?
1. Chemical composition analysis. Instrumental analysis and chemical analysis can be used. The samples used for chemical analysis include smelting samples, ingot cuttings samples, and pipe samples. The smelting sample generally adopts the instrumental analysis method, and the finished pipe sample adopts the chemical analysis method and the joint analysis method.
2. Size and shape detection. The inspection content mainly includes wall thickness, outer diameter, length, curvature, ellipticity, port slope and blunt edge angle, and cross-sectional shape of special-shaped steel pipes.
3. Surface quality inspection. There are many methods of non-destructive testing, such as ultrasonic testing, eddy current testing, magnetic particle testing, magnetic flux leakage testing, electromagnetic ultrasonic testing and penetrant testing. Each method has advantages and disadvantages.
Suitable for detecting steel pipe surface or near surface: eddy current flaw detection, magnetic particle flaw detection, magnetic flux leakage flaw detection, penetrant flaw detection. Among them, penetrant flaw detection is limited to the inspection of steel pipe surface opening defects; magnetic particle flaw detection, magnetic flux leakage flaw detection, and eddy current flaw detection are limited to ferromagnetic material inspection. Eddy current testing is sensitive to point defects, while other testing is sensitive to cracks. Ultrasonic flaw detection responds relatively quickly to the detection of the steel pipe surface, but there are still certain difficulties in the qualitative analysis of the steel pipe interior, and ultrasonic inspection is also limited by the shape and grain size of the steel pipe.
4. Chemical performance testing. Mechanical performance experiments, hydraulic tests and corrosion tests at normal temperature or at a certain temperature.
5. Process performance test. Including flattening test, ring pulling test, flaring and curling test, bending test.
6. Metallographic analysis. Includes low and high magnification checks.
7. Parameter detection of oil special pipe thread. Including coupling pattern inspection, pipe body thread inspection and inspection after the pipe body and coupling are tightened.
