Dimensional inspection of
seamless carbon steel pipe
The content of the seamless carbon steel pipe size inspection mainly includes: the wall thickness, outer diameter, length, curvature, ellipticity, end slope and blunt edge angle of the steel pipe, and the cross-sectional shape of the heterosexual steel pipe.
(1) Steel pipe wall thickness inspection
The traditional and commonly used steel pipe wall thickness inspection tool is the wall thickness micrometer. In the inspection room, measure the wall thickness of the steel pipes one by one with a qualified micrometer. The measurement of the end face of the steel pipe shall not be less than the point, and the unqualified wall thickness shall be marked. The modern
seamless steel pipe production unit uses ultrasonic equipment to detect and record the full length of the steel pipe wall thickness.
(2) Inspection of outer diameter and ovality of steel pipe
The tools used to check the outer diameter and ovality of steel pipes are mainly calipers and vernier calipers. When checking, use a qualified caliper or vernier to measure the outer diameter of the steel pipe one by one. When measuring, the caliper or vernier caliper should be perpendicular to the axis of the steel pipe, and the steel pipe is slowly rotated to measure the maximum and minimum points of the section where the steel pipe is located. When the outer diameter of the steel pipe is found to be too large or too small, it should be marked. For steel pipes that need to be inspected for pipe end ovality, ring gauges are generally used for inspection. At present, an automatic diameter measuring device can also be used to check the outer diameter of the steel pipe.
(3) Steel pipe length inspection
The traditional steel pipe length inspection tool is mainly a steel tape measure, which is measured manually. With the development of inspection technology and computer technology, automatic length measuring and weighing devices for steel pipes have been widely used.
(4) Steel pipe bending inspection
The bending inspection of the steel pipe includes the inspection of the bending degree of the whole length of the steel pipe and the inspection of the bending degree per meter. The tools used are mainly a level ruler, a feeler gauge and a fishing line. When measuring the full-length curvature of the steel pipe, use the fishing line to find the bowstring of the steel pipe, and tighten the fishing line so that the fishing line is parallel to the axis of the steel pipe and close to the surface of the steel pipe, and then use a feeler gauge to measure the gap between the surface of the steel pipe and the fishing line At the maximum distance, the maximum distance measured is the full-length bending degree of the steel pipe. The tool for measuring the bending degree per meter of the steel pipe is mainly a spirit level with a length of 1m or not less than 1.83m (for casing pipe end measurement). Gap distance on steel pipe surface.
(5) Steel pipe end bevel angle and blunt edge inspection
The inspection of the groove angle of the end face of the steel pipe is to use a square inspection. For convenience, the on-site version uses pipe end bevels and blunt edge clamps to check the bevel angle and blunt edge of the steel pipe end.
(6) Cross-sectional shape inspection of special-shaped steel pipes
Due to the different cross-sectional shapes of special-shaped steel pipes for special purposes, special tools are required to check their shape parameters.
Read more ：External surface defects of seamless carbon steel pipes
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