Steel structure is one of the more common structural forms in modern construction engineering. China is the first country to use iron to build load-bearing structure. Steel structure large-diameter straight seam steel pipe use method: steel structure large-diameter straight seam steel pipe manufacturing method: 1. slab exploration: used to manufacture large-diameter submerged arc welded straight seam steel pipe into the production line First, full-board ultrasonic inspection; 2. Milling edge: double-sided milling of the two edges of the steel plate by the edge milling machine to achieve the required plate width, edge parallelism and groove shape; 3. Pre-bending: use The pre-bending machine performs pre-bending on the edge of the plate to make the edge of the plate have the required curvature. 4. Forming: First, half of the pre-bent steel plate is stepped and stamped on the JCO molding machine, and pressed into a "J" shape. The other half of the steel plate was also bent, pressed into a "C" shape, and finally formed an open "O" shape. 5. Pre-welding: The formed straight seam welded steel pipe is welded and continuously welded by gas shielded welding (MAG); 6. Internal welding: using longitudinal multi-wire submerged arc welding (up to four wires) in straight seam Welding on the inside of the steel pipe; 7. External welding: welding by longitudinal multi-wire submerged arc welding on the outside of the straight seam submerged arc welded steel pipe; 8. Ultrasonic inspection I: Internal and external welds of straight seam welded steel pipes and base materials on both sides of the weld 100% inspection; 9. X-ray inspection I: 100% X-ray industrial TV inspection of internal and external welds, image processing system to ensure the sensitivity of flaw detection; 10. Expanding diameter: Straight seam steel pipe for submerged arc welding The full-length expansion is carried out to improve the dimensional accuracy of the steel pipe and improve the distribution of stress in the steel pipe. 11. Hydraulic test: The test of the expanded steel pipe on the hydraulic testing machine to ensure that the steel pipe meets the standard requirements Pressure, the machine has automatic recording and storage function; 12. Chamfering: the steel pipe after the inspection is qualified for pipe end processing to achieve the required pipe end groove size; 13. Ultrasonic inspection II: ultrasonic inspection again to check Straight seam welded steel Defects that may occur after expansion and water pressure; 14. X-ray inspection II: X-ray industrial TV inspection and pipe end weld inspection of steel pipes after expansion and hydrostatic test; This inspection to find pipe end defects; 16. Anti-corrosion and coating: After the qualified steel pipe is anti-corrosion and coating according to user requirements. Mechanical performance test and flattening test of steel structural steel pipe: attention to the design of steel structure straight seam steel pipe tower structure. Steel pipe tower is the main material steel pipe member, the oblique steel pipe or angle steel or garden steel constitutes the lattice transmission tower. It is one of the structural types of the transmission tower. The most common structure is steel pipe for both main and oblique materials. Followed by steel pipes for main materials and angle steel for oblique materials. In foreign countries, there are also steel pipes for the whole body of the tower, and the cross-arms are all angle steel.

In the 1970s in the country, the steel pipe tower was first used in the 220KV large-span project. The main material was made of steel pipe and the oblique material was made of garden steel, which achieved good technical and economic benefits. After that, steel pipe towers are mostly used in large spanning towers of various voltage levels, but steel pipes are also used for oblique materials.

Foreign countries in the United States and Japan have many experimental studies on steel pipe structures. There are many applications in public buildings such as trusses and space nets. However, only Japanese steel pipe towers were widely used on transmission lines. As early as the 1980s, the production standards for transmission line steel pipes were published, and the joints of steel tube towers were standardized, and the joint structure and joint force analysis were analyzed. It also forms regulations, which have reference value for us to design steel tube towers, especially for steel tube towers of general lines. Mechanical performance tests can be divided into two categories: static test and dynamic test. The static test includes tensile test, compression test, bending test, shear test, torsion test, hardness test, creep test, high temperature endurance test, stress relaxation test, fracture toughness test (see fracture mechanics analysis) and the like. The dynamic test includes an impact test, a fatigue test (see fatigue strength), and the like.

Steel structure straight seam steel pipe Hebei Zhangzhou straight seam steel pipe factory factory inspection and requirements: the surface quality of steel pipe should be smooth, no defects such as folding, cracking, delamination, lap welding are allowed. The surface of the steel pipe is allowed to have slight defects such as scribes, scratches, weld misalignments, burns and crusting that do not exceed the negative wall thickness deviation. Allows thickening of the wall thickness at the weld and the presence of internal weld beads. Straight seam steel pipes are mainly used in water supply engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, and urban construction. For liquid transportation: water supply and drainage. For gas transportation: gas, steam, liquefied petroleum gas. For structural use: for piling pipes, for bridges; for piers, roads, building structures, etc., steel steel pipe pillars are available in a full range of spiral steel pipes.

Hebei Xinzhongsen Steel Pipe Factory is a large steel pipe production enterprise in North China. It is located in Yanshan County, Cangzhou City, Hebei Province, the largest pipeline equipment manufacturing base in China. Specializing in the production of steel structural steel pipe, piling steel pipe, pipeline steel pipe, pump pipe, high pressure steel pipe, straight seam steel pipe, seamless steel pipe, spiral steel pipe and other steel pipes, complete specifications, a large number of stocks available all year round.