Test method for A335 P11 alloy steel tubes

　　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.

　　Standard: ASTM-A335

　　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.

　　Standard: ASTM-A335

　　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.

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