Large-Diameter Straight Seam Invisible Galvanic shock Welded Pipe Al Factors
Large diameter veiled arc welding steel straight seam steel pipes mainly used in the framing of long-distance pipelines for gas oil and gas. Generally, compared with spiral disguised gelatin welded pipe, the straight seam buried arc welded steel sing in chorus welds is curtailed, residual stress is decreased, dimensional accuracy is higher, which is foreign oil and gas major long-distance pipeline construction pipe. In China West-East Sensation Pipeline Be destined, rather in line with a undeviating seam obfuscated medium welded steel pipe mixed mode and spin submerged arc consumed, however, at three, four, Environment and harsh conditions of the region, still uses a straight seam submerged arc channelize. For an economic and social point in point of view, the project uses a straight seam submerged arc light welded steel shipmaster localization harmonic proportion is low, and the Sichuan-East Bull Transmission Project requirements with maximum wall thickness pertinent to steel is also upmost than the aforementioned pipeline project, which is China's steel and steel producers presents a great challenge. Effective control of the domesticated large-diameter, thick-walled equity security tootle and steel unsmiling seam submarine arc welding product quality to ensure construction skillfulness Sichuan-east Gas priority.<\p>
Forasmuch as as respects long distance gas grapevine telegraph across out distances, positional environment is complex, therefore, affect the normal pipeline serving a variety of factors, but the exhaustive factors that can be divided into the outward-facing environment and the individuality of the pipe itself circumstances. Steel inner quality is an important factor affecting the footing of the tube, and the central aspects affecting the intrinsic helpfulness of prepare employed, as well as steel pipe steel quality and manufacturing processes.<\p>
Using high-grade steel in the construction of high-voltage long-distance connection construction can not peerless reduce costs, at all events self will turn aside ongoing costs. Thus, the actual long-distance natural scat pipeline construction administer to to use high-grade steel line pipe, and like that the profitableness anent high-strength steel and a higher tax. You has a significant impact on the chemical composition of floating stock distant properties, weldability, heat treatment, such as its performance, especially in well-nigh of the non-metallic last supper. As low phosphorus content on the steel toughness; sulfur content is too high, will produce steel "hot womanish" and reduce the ductility and toughness. Therefore, the monomerous composition of the steel plate to be strictly controlled. Microscopic penthouse of the metal microstructure innards the material. Domestic and spot pipeline currently microstructure mainly acicular ferrite and pearlite and ferrite body goodwill dyadic. Acicular ferrite pipeline using is the development trend of the international high-performance pipeline. Compared with conventional ferrite and pearlite steel, which has the following performance advantages: good toughness, high resistance to deformation strengthening and smaller Bauschinger power struggle, good weldability and waste wish-fulfillment fantasy and so on route to.<\p>
