High-frequency welded steel pipe management properties: normal temperature mechanical properties, high-temperature mechanical properties, low-temperature properties, corrosion resistance. The physical and chemical properties of high-frequency welded steel pipe mainly depend on the chemical composition of steel, the structure and purity of steel, and the heat treatment method of high-frequency welded steel pipe.
Process performance of high-frequency welded steel pipe: flattening, flaring, curling, bending, welding, etc.
Metallographic structure of high-frequency welded steel pipe: low-magnification structure (macroscopic), high-magnification structure (microscopic) M, B, P, F, A, S
Inspection method of high frequency welded steel pipe:
1. Chemical composition analysis: chemical analysis method, instrumental analysis method (infrared CS instrument, direct reading spectrometer, zcP, etc.).
A. Infrared C-S instrument: analyze ferroalloys, steelmaking raw materials, and C and S elements in steel.
B. Direct reading spectrometer: C, Si, Mn, P, S, Cr, Mo, Ni, Cn, Al, W, V, Ti, B, Nb, As, Sn, Sb, Pb, Bi
C, N-0 instrument: gas content analysis N, O
2. Geometric dimension and shape inspection of high frequency welded steel pipe:
A. Wall thickness inspection of high-frequency welded steel pipes: micrometer, thickness gauge, no less than 8 points at both ends and records.
B. Inspection of the outer diameter and ovality of high-frequency welded steel pipes: caliper gauges, vernier calipers, and ring gauges to measure large and small points.
C. Length inspection of high-frequency welded steel pipes: steel tape, manual, automatic length measurement.
D. Bending inspection of high-frequency welded steel pipe: Ruler, level ruler (1m), feeler gauge, and thin line to measure bending degree per meter and full-length bending degree.
E. Inspection of end bevel angle and blunt edge of high-frequency welded steel pipe: square ruler, clamping plate.
3. Surface inspection of high frequency welded steel pipe: 100%
A. Manual visual inspection: lighting conditions, standards, experience, identification, rotation of high-frequency welded steel pipes.
B. Non-destructive testing inspection: lighting conditions, standards, experience, identification, and rotation of high-frequency welded steel pipes.
C. Wave flaw detection UT: It is sensitive to the surface and internal crack defects of various materials with uniform materials.
Post time: Feb-22-2023