The testing items of seamless steel pipes include

Posted by chase Liu on August 16th, 2023

Seamless steel pipe refers to a steel pipe that is made of a single piece of metal and has no seams on the surface. According to the production method, seamless tubes are divided into hot-rolled tubes, cold-rolled tubes, cold drawn seamless tubing, extruded tubes, jacked tubes, etc. According to the cross-sectional shape, seamless steel tubes are divided into two types: round and special-shaped, and special-shaped tubes have various complex shapes such as square, oval, triangular, hexagonal, melon-shaped, star-shaped, and finned tubes. The maximum diameter of the seamless pipe specification is 650mm, and the minimum diameter is 0.3mm. Depending on the application, there are thick-walled tubes and thin-walled tubes.

1. Steel pipe geometry and shape inspection:

①Steel pipe wall thickness inspection: Micrometer, ultrasonic, no less than 8 points at both ends and record.

②Steel pipe inspection: snap gauge, ring gauge, measure the maximum point and minimum point.

③ Steel pipe length inspection: manual and automatic length measurement.

④Steel pipe bending inspection: (1m), measuring the bending degree per meter and the bending degree of the whole length with a thin line.

⑤ Steel pipe end face angle and blunt edge inspection: square,

2. Steel pipe surface quality inspection:

①Manual visual inspection: lighting conditions, standards, experience, signs, steel pipe rotation.

②Non-destructive testing inspection:

a.UT: It is sensitive to surface and internal crack defects of various materials with uniform materials.

b.ET: Mainly sensitive to point (hole-shaped) defects.

c. Magnetic particle MT and magnetic flux leakage flaw detection: Flaw detection, suitable for the detection of iron surface and near-surface defects.

d. Electromagnetic: No coupling medium is required, and it can be applied to high-temperature, high-speed, rough steel pipe surface flaw detection.

e. Penetrant flaw detection: Fluorescence, coloring, and detection of surface defects of steel pipes.

3. Steel management performance inspection:

Measuring stress and deformation. Judgment of material strength (YS, TS) and plasticity index (A, Z) Longitudinal and transverse sample pipe section, arc, circular sample (￠10, ￠) small diameter, thin wall large diameter, thick wall calibration distance .