Seamless steel pipes inspection
It is a very important part of the seamless steel pipe production process for quality control before shipping. High-quality seamless steel pipes must pass a rigorous inspection process. More details please refer to belows:
ABOUT THE PROJECT OF INSPECTION
In order to obtain high-quality seamless steel tubes, we must carry out rigorous testing of multiple methods and steps for each seamless steel tube.Here are seven methods for quality inspection of seamless steel tubes.
1. Size and shape detection
Check the contents include: wall thickness, diameter, length, bending, ellipticity, port slope and the obtuse angle and cross-sectional shape of special-shaped steel pipe.
2.Surface quality testing
Naked eye inspection and nondestructive inspection. There are many non-destructive testing methods such as: ultrasonic testing, eddy current testing, magnetic detection, magnetic flux leakage testing, electromagnetic and ultrasonic flaw detection flaw detection. Each method has its own advantages and disadvantages: suitable for the detection of steel pipe surface or near the surface: eddy current testing, magnetic detection, magnetic flux leakage detection, penetration testing. Penetration testing is limited to inspection of the surface defects of the steel pipe. Magnetic particle inspection, magnetic flux leakage testing, eddy current testing is limited to ferromagnetic material inspection. Eddy current testing is more sensitive to point defects, other crack detection sensitivity. Ultrasonic detection of steel pipe surface detection reaction is relatively rapid, the internal qualitative analysis of steel there are still some difficulties, and ultrasonic inspection is also affected by the shape and grain size of steel pipe restrictions.
3. Chemical composition analysis
For chemical analysis of the sample sub-smelting samples, ingot drill cuttings samples, pipe samples. Smelting samples are generally used instrumental analysis method, the pipe finished sample using chemical analysis and analysis together. Commonly used chemical analysis instruments are: infrared carbon and sulfur analyzer, direct reading spectrometer, X-ray fluorescence spectrometer.
4. Chemical properties testing
(Tensile test, toughness test, hardness test), hydraulic test and corrosion test (intergranular corrosion test, anti-hydrogen cracking test-HIC, anti-sulfide stress cracking test-SSCC) at room temperature or a certain temperature.
5.Steel pipe process performance test
Including flattening experiments, ring pull tests, flaring and crimping experiments, bending experiments.
Including low magnification and high magnification.
7.Oil-specific pipe thread parameter detection
Including coupling pattern detection, pipe thread detection and tightening of the pipe body and coupling after the detection.