Views: 0 Author: Site Editor Publish Time: 2021-05-28 Origin: Site
Large diameter welded steel pipe production process
Large diameter welded steel pipe production process mainly adopts cold forming process (JCOE), which is a gradual forming method of steel plate, so that the steel plate is formed into the required bending degree under the standard die of the upper punch and the lower die, so as to achieve the required diameter size. The authoritative domestic manufacturers of large diameter welded steel pipe should be led by several national units such as Shanghai Baosteel, Qingxian Julong, and Baoji Steel Pipe.
Large diameter welded steel pipe use
Large diameter welded steel pipe is the most widely used oil and gas long-distance pipeline. The highest domestic technical requirement standard is GB/T9711.2-2008, followed by GB/T9711.1-2008. Large diameter welded steel pipes are also used in many industries such as water pipelines, steel structures, bridge engineering, foundation piling, and oil casing.
The main technical parameters and quality standards of Large diameter welded steel pipe focus on the weld quality. The weld quality level of Large diameter welded steel pipe distinguishes steel pipe implementation standards. The lowest quality of domestic products can guarantee the technical standard of straight seam steel pipe for low pressure fluid steel pipe GB/T3091-2008. For large-diameter straight seam steel pipes used in steel structures, the butt weld ensures that the quality level reaches 100% UT flaw detection, and the straightness and ovality meet the minimum requirements of the 3091 standard.
For the large diameter welded steel pipe for oil casing, the main technical parameters are the level of weld quality, pipe gauge passability, and straightness. Large diameter welded steel pipe for foundation piling steel pipes and steel structures has higher requirements to implement the GB/T13793 straight seam electric welded steel pipe standard.
The production process of Large diameter welded steel pipe is automatic submerged arc welding. The process procedures are 1 pre-bending, 2 pre-welding, 3 internal and external welding, 4 rounder straightening, and 5 port processing. Large diameter welded steel pipe is becoming more and more important in the steel pipe application industry. The main application industries of large-diameter thick-walled straight-seam steel pipe include water conservancy engineering, steel structure, power industry, chemical industry, urban planning construction, irrigation, oil and gas long-distance pipelines, Bridge piling, submarine oil pipeline.