Quality inspection method for A335 P11 alloy steel pipe
1.A335 P11 alloy steel pipe chemical composition analysis: chemical analysis, instrumental analysis (infrared C-S instrument, direct reading spectrometer, zcP, etc.).
① infrared C-S instrument: analysis of ferroalloy, steelmaking raw materials, steel in the 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
③ N-0 instrument: gas content analysis N, O
2.A335 P11 alloy steel pipe geometry and shape inspection:
①A335 P11 alloy steel pipe wall thickness check: micrometer, ultrasonic thickness gauge, both ends of not less than 8 points and recorded.
②A335 P11 alloy steel pipe diameter, ovalness check: card gauge, vernier caliper, ring gauge, measured the maximum point, the smallest point.
③A335 P11 alloy steel pipe length inspection: steel tape, artificial, automatic length measurement.
④A335 P11 alloy steel pipe bending check: ruler, level (1m), feeler, thin line per meter curvature, full length of bending.
⑤A335 P11 alloy steel pipe end groove angle and blunt edge check: angle, card board.
3.A335 P11 alloy steel pipe surface quality inspection: 100%
① artificial eye inspection: lighting conditions, standards, experience, logo, steel tube rotation.
② non-destructive testing inspection:
A. Ultrasonic testing UT:
It is sensitive to the surface and internal crack defects of A335 P11 alloy steel pipe.
B. Eddy current testing ET: (electromagnetic induction)
Mainly sensitive to point-like (hole-shaped) defects. Standard: ASTM-A335
C. Magnetic powder MT and magnetic flux leakage detection:
Magnetic flaw detection, suitable for a335 p11 alloy steel pipe surface and near surface defects detection.
D. Electromagnetic ultrasonic testing:
Do not need coupling medium, can be applied to high temperature high speed, coarse A335 P11 alloy steel pipe surface detection.
E. Penetration test:
Fluorescence, coloring, detection of A335 P11 alloy steel pipe surface defects.