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.

1. manufacturing method (1) using hot rolled strip as billet, high temperature spiral forming is often adopted, automatic submerged arc welding is used for spiral seam, and internal and external submerged arc welding seam is not less than 1. (2) the allowable weld head on the steel pipe should not be less than 300mm from the pipe end. The buyer agrees with the manufacturer to allow the head to be welded to the tube end, but the circumference between the head and the corresponding tube end spiral candle should be at least 150mm. (3) the length of each short steel pipe shall not be less than 2m for each section of the pipe which allows two short sections of the same size and the same model. The two sides of the annular weld should be interlaced and the distance of the ring is less than 150mm.

High precision cold drawn steel pipe is a new type of high-tech energy-saving product. In recent years, the technology used in the production of precision steel pipes has been widely used in the domestic hydraulic, pressure cylinder, coal mine support (pillar), oil pump pipe, Jack and other manufacturing fields. The high precision cold drawn precision steel pipe is important to popularize the use of saving steel, improving machining efficiency, saving energy, and reducing investment in hydraulic cylinder and cylinder processing equipment.

The inner and outer wall of the cold drawn precision steel pipe has no oxidation layer. It bears high pressure and no leakage, high precision, high finish, cold bending, no deformation, smooth flared mouth without cracks, and rust prevention treatment on the surface. It is mainly used for mechanical structure, hydraulic equipment and pneumatic or hydraulic components for automobile and motorcycle, such as cylinders or cylinders.

Thin-walled seamless pipe fittings are increasingly used in the industrial sector because of their compact structure, light weight, and material-saving features. However, thin-walled thin-walled tubes have low strength, poor rigidity, and are easily deformed during processing, making it difficult to ensure the accuracy of parts processing. Thin-walled parts processing has become a prominent problem. There are many factors that affect the machining accuracy of thin-walled seamless pipe parts. Machine tool, cutting tool, workpiece and workpiece clamping, cutting force during cutting process, cutting heat, etc. all cause parts machining errors. Thin-walled seamless pipe parts are more difficult to machine, especially for hole machining. Due to the effect of cutting forces on the part during the cutting process, it is prone to deformation. Cause oval or medium and small, two "waist" phenomenon. In addition, thin-walled parts due to poor heat dissipation in the process, easy to produce thermal deformation, size and shape errors can not meet the requirements of the drawings, so that parts of the shape and error increases, it is not easy to ensure the quality of parts processing. How to reduce the impact of cutting force on the deformation of the workpiece, so as to fully consider the impact of process problems on the quality of the part processing, preparation test of the workpiece clamping, tool geometry, cutting amount and other processes, effectively overrun. During the deformation process of thin-walled parts, the machining accuracy is guaranteed. The characteristics of thin-walled parts: According to the technical requirements of the drawings, the workpiece material is processed using seamless steel tubes. The surface roughness Ra1.6 of the hole and outer wall can realize turning processing. However, the requirements for the hole diameter of 0.03 for thin-walled seamless pipe fittings are relatively high. In mass production, the process route is roughly: cutting heat treatment - vehicle end car hole - quality inspection.

According to foreign media reports, the India iron and steel minister, Aruna Sharma (Aruna Sharma), in a recent event, said the India government will try to relax the market access of large foreign enterprises to encourage them to invest in new steel projects in India. By 2020, India's steel output is expected to increase from 1.34 billion tons to 1.5 billion tons. "Previously, there were some problems in the process of new steel projects in India, but now India has great room for developing large-scale steel projects. If anyone wants to build large steel projects in India, we will lay a red carpet for them and welcome them. Aruna Sharma said. It is understood that at present, India has not yet received applications for new steel projects by foreign enterprises, and most foreign investors are still on the sidelines. In addition, Aruna Sharma also urged the India steel industry to use new technologies to reduce the use of coking coal in steel production, because the coal reserves in India and most of the Asian countries are not much.

(A) Seamless steel pipe size accuracy In order to determine the position of the shaft, it is usually required for its dimensional accuracy (IT5 ~ IT7). The accuracy of the journal size of the assembly drive is generally low (IT6 ~ IT9).

P91 steel is filled with pearlite heat-resisting steel and austenitic heat-resisting steel, martensitic heat-resisting steel in the temperature range of new soda pipe line steel 600~650°C. The maximum temperature is 650°C in the original 9Cr-1Mo. Actual production based on steel. Added strengthening elements such as V, Nb, and N to form a new type of steel deterioration.

P92 high-pressure boiler tube is based on P91 steel, using a variety of enhanced new ferritic heat-resistant alloy steel pipe, good high temperature strength and creep properties of the research and development approach. Compared to P91, which is used at the highest temperature, P91 is used as a replacement for heads and steam pipes in the high temperature and pressure parts of large metal-fired boilers. Due to the tungsten, molybdenum compound solution, and reinforced multi-reinforcement devices, the P92 performance test P91 difficult-to-grind device is quite large, and the temperature selection scroll range is narrow. The team members of the technology center, based on summing up past experience, put high alloy tube system technology into full consideration of the equipment's production capacity and production process conditions, and actively explored the two-tube Assel rolling mill to improve the heating system, optimize the process parameters, and tools. The distribution of shape and deformation, in strict accordance with the internal control standards of production units, successfully rolled Φ168×30mmp92 high-pressure boiler tubes.

High-precision cold-drawn steel pipe is a new type of high-tech energy-saving product. In recent years, the use of precision steel pipes produced by this technology has been widely used in domestic manufacturing fields such as hydraulic and pneumatic cylinders, coal mine underground supports (pillars), oil pump pipes, and jacks. High-precision cold-drawn precision steel tubes promote the use of economizing steel, improve processing efficiency, save energy, and reduce investment in hydraulic cylinders and block processing equipment is very important.

A106B seamless steel pipe thread inspection is more complex and divided into the screw thread test and pipe thread test. 1. Collar thread inspection After the processing of the wire, the internal taper, the inner pitch, the thread height and the concentricity are tested, and the tightness and the comprehensive parameters are checked by the thread plug and the incomplete head. In addition, the thread surface according to API standards for artificial eye inspection.

Resistance-welded tubes (abbreviated as welded tubes) can only occur under certain circumstances and have the following characteristics: (1) Stress corrosion cracking occurs only when stress (especially tensile stress) is present. This stress can be applied stress, or residual stress introduced during welding and joining, or expansion stress caused by wedge action of the corrosion product. (2) Stress corrosion cracking is a time-dependent lag damage that is completely similar to hydrogen hysteresis cracking. (3) Stress corrosion cracking is a kind of low stress brittle fracture.

SA 213 Standard Specification for Seamless Ferritic and austenitic alloy steel boilers, superheater and heat exchanger tubes. 1. surface state: The austenitic stainless steel pipes should be cleaned and descaled. When using bright annealing, no pickling is necessary.