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Large diameter straight seam thick wall steel pipe
- Product Description
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Product Introduction
The large-diameter thick-wall straight seam steel pipe is made of steel plate. After the rolling is completed, it needs to be welded. Generally, three-step welding, pre-welding, external welding, and internal welding are carried out.
Flaw detection is required after welding. The exported steel pipes need to be beveled, painted and capped. Length processing according to customer's requirements. It is generally divided into fixed length and indefinite length. The main implementation standards are GB/T3091,GB/T9711,API. GB/T9711 is divided into three parts: A grade steel, B grade steel, C grade steel. Large diameter thick wall straight seam steel pipe is a kind of oil and gas pipeline with large amount and high reliability. Submerged arc welding straight seam steel pipe unit, forming unit in the form of UOE, RBE, JCOE, etc.
The main production process is qualified steel plate-chamfering of plate edge-pre-bending of plate edge-forming-JCOE forming-continuous welding of steel pipe joint-arc welding of pipe joint-submerged arc joint of pipe joint-rounding and straightening-chamfering and leveling of pipe end-ultrasonic inspection of welding seam-repair of unqualified welding bead-X-ray inspection of welding bead-ultrasonic inspection of welding bead-repair of unqualified welding bead-drying treatment of inner surface-inner surface of inner pipe rust removal treatment-inner surface of pipe anti-rust coating treatment-outer surface of pipe anti-rust coating treatment-finished product.
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