Oil casing pipe production of high-end products, the casing type more, the diameter of the casing size range of a total of 15 kinds of specifications, its diameter is in the range of 114.3-508mm; the steel grade is divided into J55, K55, N80, L-80, P-110, C-90, C-95, T-95 and other 11 kinds of casing pipe end; buckle type type and demanding that can be processed with STC, LC, buckle type BC and VAM type buckle. Oil casing production and installation process involves a lot of testing, mainly in the following:
1, ultrasonic detection
Ultrasonic detection in materials dissemination, influence propagation change material acoustic properties and the internal organization of the ultrasonic detection, affected by the ultrasonic degree and the situation, to understand the change of structure and properties of materials.
2, ray detection
Ray detection is the use of normal parts and defects through the quantity of radiation caused by different film emissivity difference.
3, penetration test
Penetration test is the use of capillary liquid, liquid solid material will penetrate into the surface of the opening defect, through the imaging agent will permeate into the suction to display surface defects.
Penetrant testing for a variety of metal and ceramic workpiece, and the penetration from the operation to the defect display time is relatively short, generally about half an hour, we can detect the surface fatigue, stress corrosion and crack, crack size can be measured directly.
4, magnetic particle testing
Magnetic particle test of magnetic flux leakage and magnetic adsorption by defects, the formation of the magnetic mark, to provide display defects, can detect the surface and sub surface defects, defect properties easily recognizable, paint and electroplating surface does not affect the detection sensitivity.
5, eddy current testing
Eddy current testing is mainly the use of ferromagnetic coil in eddy current induced in the workpiece, to analyze the quality status inside the workpiece, can detect the surface of conductive material and surface defects are usually difficult to control parameters, the detection results difficult to interpret, and detect objects must be conductive crack, and indirect measurement of defect length.
6, magnetic flux leakage testing
Oil casing magnetic leakage detection is based on the basic characteristics of ferromagnetic materials with high permeability of the ferromagnetic material, by measuring the change in permeability due to defects caused by the detection of in-service oil casing quality.
7, magnetic memory testing
Magnetic memory testing is the relationship between the physical nature of magnetic phenomena and dislocation process originating metal, has the advantages of high efficiency, low cost, no need to polish and many other advantages, has important and extensive application prospects in industry.
Detection method of in several products for magnetic memory testing there is no specific standard, yet to be developed, the other 6 are testing their own standards, mature.