Nanhai spiral steel prices

Nanhai spiral steel prices 18,823,102,210 18,033,242,424 Liu Bao six spiral pipe is a strip coil for raw materials, often warm extrusion, automatic double-sided silk spiral submerged arc welding process pipe joints. Spiral Weld Pipe processing unit will strip into the pipe, the multi-channel roll rolling, gradually rolled steel, formed with an opening gap of circular tube, squeeze rollers adjust reduction, the weld gap control In 1 ~ 3mm, and weld the ends flush. 1. If the gap is too large, resulting in reduction of the proximity effect, lack of eddy heat weld together indirectly caused by poor grain unfused or cracking. 2. If the gap is too small, causing the proximity effect increases, excessive heat welding, weld cause burning; or weld extruded to form a pit after rolling, affecting the quality of the weld surface. After the two edges of the tube is heated to soldering temperature, in the squeeze roll pressing, to form a common mutual penetration of the metal grains, crystals, and ultimately form a strong weld. Spiral steel pipe if the pressing force is too small, the formation of crystals on the small number of joint, the weld metal strength is reduced, the force generated after cracking; if the pressing force is too large, will make a molten state is extruded weld metal, not only reduces the weld strength, and will generate a lot of internal and external burrs, and even cause defects such as welding seam ride. Nanhai price spiral steel pipe spiral steel main technical characteristics technical characteristics:. A molding process, the steel deformation uniformity, low residual stress, no scratches the surface. Spiral steel processing in diameter and wall thickness range of sizes greater flexibility, especially in the production of high-grade thick-walled tubes, especially small and medium-diameter thick-walled tube aspect has incomparable advantages to other processes, users can meet In the spiral pipe specifications more requests. b. The use of advanced double-sided submerged arc welding process can be achieved in the best position welding, less prone to the wrong side, partial and incomplete penetration welding defects, easy to control the quality of welding. c. 100% of the steel quality inspection, so that the whole process of steel production in the effective detection, under surveillance, effectively ensure the product quality. d. All the equipment the entire production line and computer data acquisition system with networking capabilities, real-time transmission of data from the central control room of the production process technical parameters. Pressure fluid transport with spiral submerged arc welded pipe SY5036-2000, mainly used to transport oil, natural gas pipelines; pressure fluid transport spiral seam high frequency welded steel pipe SY5038-2000, high frequency welding lap welding method for pressurized fluid transport spiral seam high frequency welded steel pipe. Strong pressure steel, plastic, and easy welding and machining molding; general low pressure fluid, with spiral submerged arc welded pipe SY5037-2000, using double-sided automatic submerged arc welding or welding into the legal system for water, gas , air and steam low pressure liquid delivery SAW pipe. Commonly used spiral steel pipe standards are generally divided into: SY / T5037-2008 (Ministry of standard, also known as general fluid pipes with spiral submerged arc welded pipe), GB / T9711.1-2008 (GB, also known as the oil and gas industries - Steel pipe Technical delivery conditions Part: A grade steel (demanding a GB / T9711.2 B grade steel)), API-5L (American Petroleum Institute, also known as line pipe; which is divided into two levels PSL1 and PSL2), SY / T5040-2008 (pile with spiral welded steel pipe). SY / T5037-2008 Oil Ministry is setting standards are generally referred to as the Ministry of standard GB / T9711.1-2008 national spiral, oil and natural gas industries - Steel pipe, A-level low pressure liquid delivery spiral seam high frequency welded steel pipe (SY5039-2000 ) is a hot-rolled steel strip coils for the tube, often warm spiral shape, using high-frequency welding lap welding method for low pressure liquid delivery spiral seam high frequency welded steel pipe. Pile with spiral welded steel pipe (SY5040-2000) is a hot-rolled steel strip coils for the tube, often warm spiral shape, using double-sided submerged arc welding or high frequency welded for civil engineering structures, piers, bridges other basic spiral steel pipe pile with mainly used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction, is one of the twenty key product development. For the transport of liquids: water supply, drainage. For gas transportation: gas, steam, liquefied petroleum gas. For structural purposes: as piling pipe, for bridges; piers, roads, buildings and other structures tube. 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