Seamless steel tube forming

The main technical characteristics of DSAW pipe First, during the process of steel tube forming, the deformation of the steel plate is uniform, the residual stress is small, and the surface does not produce scratches. The machined steel pipe has more flexibility in the size and thickness of the steel tube, especially in the production of high grade thick wall steel pipe, especially the large diameter thick wall tube, which can meet the advantages of other processes. Steel specifications are more required;

There is thermal stress and tissue stress in the heat treatment of seamless steel pipe. The internal stress can be superimposed or partially offset, it is complex and changeable, because it can change with heating temperature, heating speed, cooling speed, cooling speed, shape and size of parts, so the heat treatment deformation is inevitable. The mechanical collision of the seamless steel pipe in the heat treatment process can also cause the deformation of the parts, but the deformation can be improved with the operation, thus reducing and avoiding.

If it is drinking water, IPN8710 anticorrosion spiral pipe is needed for water transportation. The IPN8710 anticorrosion spiral tube is composed of waterborne aliphatic polyurethane prepolymer and epoxy resin, high quality pigment, additive and solvent. It is specially used for food, drinking water and other equipment contact, pipeline water pipe, drinking water tank surface corrosion.

The economic benefits of aluminum alloy drill pipe are mainly manifested in the following aspects: (1) obtaining high technical and economic benefits. Although the investment recovery period is relatively long, it is more competitive than steel drill pipe.

Sleeve coupling is necessary for connecting two pipe sleeves. The manufacturing method is the same as seamless pipe, and domestic J55 and n80Q special steel products are used. The ends of the steel pipes are internally threaded to connect the upper and lower pipes. In order to ensure the tightness of the joints, the thread accuracy requirements are more stringent.

Casing pipe with a total of H40, J55, K55, M65, N80, L80, C90, T95, C95, P110, Q125 more than twenty different steel grade and type. In order to distinguish between different grade of steel strength, thread type, respectively, with different color code and symbols represent represent steel grade and thread.

Products: API SPEC 5CT Casing Pipe and Tubing & Casing. Applications: It is widely used for oil casing and tubing in oil wells Grades: J55, K55, N80, L80-1, L80-9Cr, L80-13Cr, P110, Q125, K55 D10, L80 D10. Special Service: Sweet Service, Sour Service, Anti-H2S, NACE MR0175/ISO15156 Produce Process: Hot Rolled, Cold Drawn, Hot Expanded. Accessories: Pup Joint, Coupling (Coupling Stock), Blast Joint, Crossover etc. Connection: API connection and Premium connection, like TPCQ, HSM etc.

N80 steel pipe is generally a casing. N80 casing is an important equipment for oil drilling. Its main equipment also includes drill pipe, core pipe and casing, drill collar and small diameter drilling pipe.

60Hz power is converted to high frequency power for solid metal welding of 90% efficiency. In high frequency welding, the welding power is generally above 100kW, heating, impedance, and the power consumption of the roller is 4/5, so the key to reduce the power loss is to set the reasonable coil, the impedance and the reasonable configuration of the rolling mill. In most cases, by optimizing welding process, the power loss can be reduced by 50%, which can improve welding quality, reduce downtime and increase output.

Is there any treatment for a welded pipe that is a black iron pipe. The welded steel pipes or steel plates are bent into circular, square and other shapes, and then welded on the joint surface with steel pipes. The blank used in the welded steel pipe is steel or strip.

If the resistance welded pipe (ERW) is not heat treated through the pipe, the residual tensile stress around the weld is about 350MPa, which is close to the yield strength of the pipe. When the weld enters the working electrode, the residual stress falls below 100MPa. The circumferential tensile stress can reduce the corrosion potential of the weld, accelerate corrosion and increase the sensitivity of groove corrosion. After heat treatment, the residual tensile stress in the weld is small, which is 10 ~ 100MPa. In this way, the traditional measurement method can not characterize the corrosion resistance of welded pipe products in practical application, and can not really distinguish the effect of heat treatment on corrosion resistance of welded pipe.

The steel pipe pile is suitable for terminal construction. The diameter range is generally between 400-2000mm, and the most commonly used is 1800mm.

In the process of producing high frequency welded pipe, the manufacturer of welded pipe will encounter the damage of the tube surface, which is due to the main cause of the guide roll and the extrusion roll.

1. Pipe gap control Adjust the extrusion volume of the squeeze roller, so that both ends of the weld to keep flush, opening angle of 7 degrees below the weld gap control in 1-3 mm. Weld control is too large, there may be poor welding, welds are not fused or cracked, weld control is too small, due to heat is too large, likely to cause weld burns, melting metal splash, tumor is too large, affecting welding quality The (Metal spatter reasons: squeeze the melting tube edge, the weld inside the steam pressure is greater than the surface pressure)

High frequency welded pipe typical process: steel strip open reel straightening - head and tail shearing strip welding - casing storage - forming - Welding - cleaning burr - sizing - Scissors - first inspection - pipeline seal treatment - water pressure test - defect detection - printing and coating - finished products.

The production process of high frequency welded pipe depends on the type of product. It needs a series of processes from raw material to finished product. The completion of these processes requires a variety of mechanical equipment and welding, electrical control, and testing device. These devices and equipment can be reasonably arranged according to different process flow, and the typical process of high frequency welded pipe can be made. Process: open coil - steel strip straightening - head and tail shear - pipe butt welding - live storage - forming - Welding - removal of burr - sizing - initial inspection - pipe straightening - pipe section - water pressure test - defect detection - printing and coating - finished products.

FBE anticorrosive tube is a new type of coating developed over the past 30 years. It uses electrostatic spraying technology to coat epoxy powder coatings. The coating has the advantages of simple coating operation, no pollution, good impact resistance and bending resistance, high temperature resistance and high resistance. It has been widely used abroad.

In addition to anticorrosion, the municipal water supply pipeline and spiral steel pipe need internal anticorrosion treatment. At that time, most cement mortar fabrics were used for anticorrosion treatment. The method was to uniformly spread a layer of cement mortar on the steel pipe wall and protect it from the pipeline. The cement mortar in the coating can not only avoid the corrosion of the inner wall of the pipeline, prolong the service life of the pipeline, protect the water quality, adhere to or improve the water supply of the pipeline, and have obvious economic and social benefits.

In the past 20 years, the steel pipe structure has been rapidly developed at home and abroad. Has been widely used in modern industrial buildings, warehouses, stadiums, exhibition halls, stadiums, docks, railway stations, office buildings, hotels and other buildings. Due to its good performance, it is more and more widely used at home and abroad. The tube structure can be divided into a beam structure and an arch structure from the structure. From the layout can be divided into planar tube structure and space tube structure. Mainly used for two sections of the tube: tube and square tube. The pipe is connected to the pipe by a cross-weld, because the treatment makes the structure more neat and beautiful. The hybrid structure system formed by the combination of the tubular structure and the cable, such as the aforementioned beam string structure, fully exerts the superiority of different materials or components, and is the direction of future structural development. Pipe racks have been widely used in large-span facilities such as gymnasiums, terminal buildings, convention centers, and entertainment centers.

Anticorrosive spiral steel pipe is suitable for both the outer wall of the living resource transportation pipeline. The anti-corrosion of the equipment of the transport medium in the industrial production can be effectively waterproof and the anti-leakage, which can improve the service life of the pipeline.