Due to ssaw steel pipe welding technology, in addition to such high production efficiency; produce less auxiliary time, saving time change electrode; welding conditions clean and free of spatter, saves clean-up time; high weld quality. Spiral Pipe factory for delivery to provide the necessary conditions so that large spiral pipe production time is guaranteed, so it is widely used with. Spiral submerged arc welded steel pipe is a spiral bending, were sewn inside and outside seam welded steel pipe with spiral submerged arc welding. For the following reasons it is widely used in large-diameter pipe production: 1) Just change the angle formed, you can use the same width of the strip steel production of various calibres; 2) Because it is a continuous bending, the pipe length unlimited length; 3) spiral weld uniformly distributed over the entire circumference of the pipe, the pipe high dimensional accuracy, intensity is higher; 4) cost of equipment cheap, easy to change the size, suitable for small quantity and variety of steel production.

Usually in steel processing, deformation method of lsaw steel pipe is as follows: First, reasonable selection. Precision messy mold material should choose a good micro-deformation of steel on steel carbide segregation serious mold should be a reasonable casting and heat treatment quenching and tempering, solution heat treatment on a large double refining and casting mold steel can not be carried out. Reasonable choice of heating temperature control heating rate, on messy precision molds can be heated slowly, preheating and other methods to reduce the mold uniform heating heat deformation. Second, the correct operation of the heat treatment process and reasonable heat treatment process is also a useful way to reduce messy precision mold deformation. Deformation reason messy precision molds are often messy, but we only need to master the rules of the deformation, to analyze the attack reason, the choice of methods to avoid abnormal deformation of the mold can be reduced, and also can be controlled. Third, precision molds to be messy pre-heat treatment, machining process to eliminate the remaining episodes of stress. Precision messy mold, when conditions allow, try to use cryogenic vacuum heating process and hardening after quenching. Mold hardness in ensuring the premise, try to use pre-cooling, grading cooling or quenching temperature quenching process. Fourth, mold planning is depicted to be reasonable, not too poor thickness, shape to be symmetrical with respect to large deformation mold deformation to master the rules, set aside allowance, on large, sophisticated planning messy mold can be used in combination. For some messy precision molds can be used pre-heat treatment, aging heat treatment, quenching and nitriding to control the accuracy of the mold. When mold repair blisters, porosity, wear and other defects, selection of cold welding and other small heat-affected patch repair equipment, to prevent deformation during the attack.

After normalizing the intensity, hardness and toughness after annealing than high, ductility is not reduced. Application of normalizing and annealing normalizing similar, it has the following characteristics: high mechanical properties normalized steel, simple operation, short production cycle and less energy-consuming, so choose normalizing as possible. There are normalizing in the following aspects: 1. The general structure of the final heat treatment member; normalizing can eliminate casting or forging production overheating defects refine the organization, to improve the mechanical properties. 2. To improve the low carbon steel and low carbon alloy steel machinability; hardness 160 ~ 230HB metal cutting machining, high hardness of the metal, not only difficult to process, and tool wear, energy consumption is also large, low hardness, processing and easily stick the knife, the tool heat and wear, and surface finish of machined parts is very poor. Shading indicates better cutting performance and low-carbon steel annealing 160HB hardness generally in the following, and poor machinability, but the choice of normalizing (1:00 dash line), since the increase in the amount of pearlite, the lamellar spacing becomes thin, so that improved cutting performance. 3. As a medium carbon steel production than the main part of the pre-heat treatment; normalizing used to pre-heat treatment for the more important part. For example, carbon structural steel normalizing, make some abnormal tissue to normal tissue, eliminate thermal processing defects caused by the organization, and it is reduced to improve the quenching deformation and cracking quenching quality has a positive effect. 4. Elimination of eutectoid steel mesh in the secondary cementite for organizations to prepare for the ball annealing, normalizing This it is because the cooling rate is relatively fast, too late to reticulate secondary cementite precipitation along the grain boundaries A. 5. Some large or complex shaped parts, quenching may be at risk of cracking, often instead of normalizing quenching and tempering treatment, as these parts of the final heat treatment.

Piling pipe surface treatment process: 1. The surface-treated steel sheet piling pipe manufacturers to avoid the formation of oxide scale and unwinding process of formation should be established plate cleaning device. 2. The edge steel processing, pipe piling side set up rusting and deburring means to reduce the porosity may arise. Removing device is installed in the best position of milling machine, cutting disc, the device structure is the location of a surface fluctuations can adjust the gap capstan, fluctuating pressure plate edges. 3. Weld profile, weld coefficient is too small, narrow and deep weld gas and inclusion is not easy come, easy to form pores and slag. General weld coefficient control 1.3 - 1.5, thick-walled pipe welding maximum, minimum thin walls. 4. Reduce the secondary magnetic field in order to reduce the influence of magnetic blow, to make the position of the workpiece welding cable connection only from the welding terminals to avoid some welding cable secondary magnetic field on the workpiece.

Anti-corrosion steel refers embalmed process processing, can effectively prevent or mitigate the occurrence of steel pipes and tubes in the transport and use of chemical or electrochemical reactions during corrosion phenomena. Buried pipeline pipe coating process is as follows: (1) First, the outer wall of the pipe fully embalmed, rust requires the same tube wall. (2) Paint still use gray GZ-2 new polymer anti-corrosion coatings (Universal), paint and configuration instructions see the product manual. (3) Large diameter spiral steel pipe wall corrosion using two layers of primer, two-story glass cloth, the total thickness of the floor finish should reach 480-620μm. . (4) On the coated surface of the weld, remove burrs and other requirements. (5) Priming should be uniform, not leak coated surface dry to topcoat, (usually 1-4 hours) for too long will affect the paint adhesion. If the primer is dry, use sandpaper to fight hair after FIG finish. Layers of paint applied to the margins of the film surface should be as well. (6) Two-story glass cloth should be sandwiched between three finish, wrapped around a glass cloth should be smooth, uniform lap, soaked in paint to avoid wrinkles drum kit. Cloth wrapped around the glass and paint coating simultaneously. (7) The tube wall paint should stay out of the provisional pipeline on both sides of each bracket 200mm range. Coating  (8) Visual inspection should be full, even, bright, glass cloth mesh is filled with paint, to fold the blister should be repaired.