Acceptance criteria and quality inspection methods for seamless steel pipes

Date:2023-04-12View:212Tags:Stainless Steel Plate,seamless steel pipes

inspection methods for seamless steel pipes

1. Steel pipe geometry and shape inspection:

① Steel pipe wall thickness inspection: micrometer, ultrasonic thickness gauge, no less than 8 points at both ends and record.
②Steel pipe outer diameter and ovality inspection: calliper gauge, vernier caliper, ring gauge, measure the maximum point and minimum point.
③ Steel pipe length inspection: steel tape, manual, automatic length measurement.
④Steel tube bending inspection: Ruler, level ruler (1m), feeler gauge, and thin line to measure bending degree per meter and full length bending degree.

⑤ Steel pipe end bevel angle and blunt edge inspection: angle ruler, clamping plate.


2. Steel pipe surface quality inspection: 100%
①Manual visual inspection: lighting conditions, standards, experience, signs, steel pipe rotation.inspection methods for seamless steel pipes②Non-destructive testing inspection:a. Ultrasonic flaw detection UT:
It is sensitive to surface and internal crack defects of various materials with uniform materials.
Standard: GB/T 5777-1996 Level: C5
b. Eddy current flaw detection ET: (electromagnetic induction)
Mainly sensitive to point (hole-shaped) defects. Standard: GB/T 7735-2004
Level: B level
c. Magnetic particle MT and magnetic flux leakage testing:
Magnetic flaw detection is suitable for the detection of surface and near-surface defects of ferromagnetic materials.
Standard: GB/T 12606-1999 Level: C4d. Electromagnetic ultrasonic flaw detection:

No coupling medium is required, and it can be applied to high-temperature, high-speed, and rough surface flaw detection of steel pipes.
e. Penetration testing:

Fluorescence, coloring, and detection of steel pipe surface defects.


3. Steel management performance inspection:① Tensile test: measure stress and deformation, determine the strength (YS, TS) and plasticity index (A, Z) of the material                     Longitudinal and transverse sample pipe sections, arc and circular samples (¢10,¢12.5)



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