1. Surface quality requirements
The surface quality requirements for polished stainless steel pipes are as follows:
(1) Material: no impurities and sand holes are allowed.
(2) Polishing: no sand grain, hemp grain, rough surface residue and residual white surface due to overheating are allowed; after polishing, the holes should be uniform and no elongation or deformation should be allowed; the plane should be flat and no concave or uneven wavy surface should be allowed; the curved surface should be smooth and no distortion should be allowed; in addition, the corners of the two surfaces must meet the requirements and cannot be concave (except for special requirements) and the two vertical surfaces should maintain the symmetry of the right angles formed by the two surfaces after polishing.
(3) Protection: No pinching, indentation, bruise, abrasion, crack, hole or gap is allowed.
2. Inspection method
(1) Visual inspection: Visual acuity greater than 1.2, under 220V50HZ18/40W fluorescent lamp and 220V50HZ40W fluorescent lamp, the visual inspection distance is 45±5cm.
(2) Manual inspection: Place the product horizontally, visually inspect the surface, and after the inspection, rotate to the adjacent surface with both hands as the axis, visually inspect at an angle, and gradually inspect each surface. After the visual inspection in the previous direction is completed, rotate 90 degrees to the north-south direction, first rotate up and down at a certain angle for visual inspection, and gradually inspect each surface.
SS 304L Polished Pipe
