Steel bending pipes are manufactured step-by-step into finished products. Throughout the production process, the steel pipes must be bent, and the bending technique requires specific skills, with varying degrees of bending. What are the technical requirements used in this production process?

1. Online heat treatment of the weld seam in the closed section can offset the welding stress of the steel bending pipe, improve the weld microstructure, and anneal or normalize the entire cold-formed steel to relieve stress. The mechanical properties of cold-formed steel include strength, tensile strength, and elongation at break.

2. The surface of the steel bending pipe must be free of bubbles, cracks, scars, wrinkles, inclusions, and delamination. Minor pits, bumps, indentations, hairlines, scratches, and indented iron scales are permissible, not exceeding 10% of the nominal thickness. Surface defects should be cleaned by grinding, but the thickness of the cold-formed steel after cleaning must not be less than the allowable thickness.

Therefore, the above technology is used in the production of steel bending pipes. As bending and pipe requirements increase, the technology used in pipe manufacturing will become increasingly advanced. During the bending process, burrs on the pipe should be cleaned promptly. The quality of steel bending pipes is a major concern, as it determines subsequent processing and construction. Therefore, quality is crucial in the production process. So, what factors affect the quality of steel bending pipes?

1. The precision of the bending jig is one of the factors affecting the quality of steel bending pipes. In the manufacturing process of the bending jig, in addition to the limitations of specifications and dimensions, the user needs to select the appropriate bending jig based on the diameter of the steel bending pipe.

2. The bending jig serves as a reference for users when selecting the relationship between pipe diameter and wall thickness. According to pipe processing and acceptance standards, it reflects the impact of relative bending radius and relative wall thickness on pipe quality. During pure bending, under external force, the outer wall of the neutral layer is thinned by tensile stress, while the inner wall is thickened by compressive stress, resulting in a change in the pipe’s cross-section due to the combined force.

3. The bending function and surface corrosion of the pipe itself also affect the quality of steel bending pipes. Observe the processing function and surface corrosion.

The quality of steel bending pipes is easily affected by the above-mentioned factors, especially during the production process. Attention should be paid to the pipe during production and bending, as many factors can affect the quality of the pipe.