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1. Chemical composition analysis: chemical analysis, instrumental analysis (infrared C-S instrument, direct reading spectrometer, zcP, etc.).
1 Infrared C-S instrument: analysis of ferroalloy, steel raw materials, steel, C, S elements.
2 Direct reading spectrometer: C, Si, Mn, P, S, Cr, Mo, Ni, Cn, A1, W, V, Ti, B, Nb, As, Sn, Sb, Pb, Bi in a bulk sample
3N-0 instrument: gas content analysis N, O
2. Steel pipe geometry and shape inspection:
1 Check the wall thickness of the steel pipe: Micrometer, ultrasonic thickness gauge, no less than 8 points at both ends and record.
2 Steel tube outer diameter, ellipticity check: Snap gauge, vernier caliper, ring gauge, measure the maximum point, the minimum point.
3 steel pipe length inspection: steel tape measure, manual, automatic length measurement.
4 Check the bending of the steel pipe: The ruler, the horizontal ruler (1m), the feeler ruler, and the thin line measure the bending per meter and the full-length curve.
5 steel pipe end face angle and blunt edge inspection: square, card board.
3. Steel surface quality inspection: 100%
1 artificial eye inspection: lighting conditions, standards, experience, logos, steel pipe rotation.
2 Non-destructive testing:
a. Ultrasonic flaw detection UT:
It is sensitive to the material surface and internal crack defects of various materials.
Standard: GB/T 5777-1996 Level: C5 b. Eddy Current Inspection ET: (Electromagnetic induction)
Mainly sensitive to point (hole-shaped) defects.
Standard: GB/T 7735-2004
Level: Class B c. Magnetic Powder MT and Magnetic Flux Leak Detection:
Magnetic flaw detection, suitable for the detection of surface and near surface defects of ferromagnetic materials.
Standard: GB/T
Level: C4 level d. Electromagnetic ultrasonic flaw detection:
No coupling medium is required, which can be applied to high-temperature, high-speed, rough dry steel pipe surface flaw detection.
e. Penetration testing:
Fluorescence, coloration, and detection of surface defects in steel tubes.
4. Steel management performance test:
1 Tensile test: measuring stress and deformation, determining material strength (YS, TS) and plasticity index (A, Z)
Longitudinal, horizontal sample sections, arcs, and round specimens (¢10, ¢12.5)
Small diameter, thin wall large diameter, thick wall calibration distance.
Note: The elongation of the specimen after breaking is related to the specimen size GB/T 1760
2 Impact Test: CVN, Notch Type C, Type V, Work J Value J/cm2
Standard sample 10×10×55(mm) Non-standard sample 5×10×55(mm)
3 Hardness test: Brinell hardness HB, Rockwell hardness HRC, Vickers hardness HV, etc. 4 Hydraulic test: test pressure, regulation time, p=2Sδ/D
5. Steel pipe process performance test:
1 Flattening test: round sample C-shaped sample (S/D>0.15) H=(1+2)S/(âˆ+S/D)
L=40～100mm Unit length deformation coefficient=0.07～0.08
2 Ring pull test: L=15mm No crack is acceptable 3 Flaring and curling test: Top center taper is 30°, 40°, 60°
4 Bending test: It can replace flattening test (for large-diameter tube)
6. Steel tube metallographic analysis:
1 High magnification test (microscopic analysis): Non-metallic inclusions 100x GB/T 10561 Grain size: Grade, differential Organization: M, B, S, T, P, F, AS
Decarburized layer: internal and external A method Rating: A type - Sulfide B type - Oxide C type - Silicate D - Spherical oxidation DS type 2 Low magnification test (macro analysis): naked eye, magnifying glass 10x or less a. Acid Erosion test
b. Sulfur test method (tube test, showing low-grained tissue and defects, such as loose, segregation, subcutaneous bubbles, peeling, white spots, inclusions and so on.
c. Tower hairline test: The number, length, and distribution of hair lines are examined.
The seamless steel pipe inspection method is provided by the release. 