Steel elbow are produced step by step, and then made into finished products. During the entire production process, because there are requirements for the pipes to be bent, and the bending of the pipes requires some techniques, the degree of bending is also different. What are the technical requirements used throughout the production process?
1. The online heat treatment of the weld of the closed section can offset the welding stress of the steel elbow, improve the weld structure, and anneal or normalize the entire cold-formed steel to offset the stress. The mechanical properties of cold-formed steel include strength, tensile strength, and tensile strength. Strength and elongation at break.
2. There shall be no bubbles, cracks, scars, folds, inclusions, or delaminations on the surface of the steel elbow, and slight pits, bulges, indentations, hairlines, scratches, and pressures not greater than 10% of the nominal thickness are allowed. Into the iron scale, the surface defects should be cleaned by grinding, but the thickness of the cold-formed steel after cleaning should not be less than the allowable thickness.
Therefore, the above technologies are used in the production of steel elbows. With the increase in bending requirements and pipeline requirements, the technology used in pipelines will become more and more advanced. During the bending process, the burrs on the pipeline should be cleaned in time. Quality is an aspect that many people pay attention to. Quality determines post-processing and construction, so in the production process, quality is really important, so what are the factors that affect the quality of steel elbows?
(1) The accuracy of the curved tire is a factor affecting the quality of the steel pipe bend. In the manufacturing process of the curved tire, in addition to the limitations of specifications and dimensions, the bending process also requires the user to select the corresponding curved tire according to the diameter of the steel pipe bend.
(2) It is a reference for users to choose the relationship between pipe diameter and wall thickness. The pipeline processing acceptance criteria reflect the influence of relative bending radius and relative wall thickness on the quality of the pipeline. In pure bending, under the action of external force, the outer arm of the neutral layer wall is thinned by tensile stress, and the inner side is subjected to compressive stress, effect, and thickening, and the resultant force changes the cross-section of the tube.
(3) The bending function and appearance erosion of the pipeline itself will also affect the quality of the steel elbow. Observe the processing function and surface corrosion.
The quality of steel elbows is easily affected by the above factors, especially in the production process, attention should be paid to the production and bending of pipes. After all, many factors may affect the quality of pipes.
Post time: Nov-22-2022