Common defects and defects of oil casing thread 1, black top oil casing thread

Seamless steel pipe by different cross-sectional shapes can be divided into tubular and special-shaped tube. Because of the same conditions on the circumference, the maximum area of the tube can accommodate more fluid. In addition, the circular cross-section withstands internal or external radial pressure, force uniformity. Therefore, the vast majority of pipelines are pipelines. However, there are some restrictions on tubes. Under such conditions as plane bending, square tubes such as square and large seamless steel tubes, some agricultural machinery skeletons, steel-wood furniture, popular square and rectangular tubes, etc. Mechanical properties of different seamless steel tubes.

First of all, 304 stainless steel seamless pipe thicker, more economical and practical, the thinner the wall thickness, processing costs will be substantially increased; Second, 304 stainless steel seamless pipe technology to determine its limitations, the general seamless low accuracy: the uneven thickness of the inner wall, low brightness inside the tube, the fixed length of the high cost, and the hole outside, black spots difficult to remove; Third, 304 stainless steel seamless pipe testing and plastic processing must be offline. Therefore, it shows its superiority in high-pressure, high-strength mechanical structure.

304 seamless steel tube burst causes are as follows: 1.304 Seamless Polishing Flatness Insufficient to Deflect.

Sleeve in the production of prone to folding defects, affecting the improvement of product quality, need to be controlled.

Seamless steel pipe wall thickness control is the production of steel pipe difficult to improve the precision of seamless steel pipe wall thickness Production measures include the following aspects: 1, tube heating

Seamless thick-walled pipe uneven 1, in the seamless steel pipe perforation process, the extension coefficient is too large, the rolling speed is too high, smooth rolling.

Core Manufacturing Technology The core manufacturing technologies for casing and tubing are as follows:

For galvanized steel pipe production line has special requirements, especially in the production environment, a good environment can help us better production, improve production quality and production efficiency, especially galvanized steel, the need for a stable environment is even more so.

In order to understand the quality and quality of cement concrete and pipe wall of seamless concrete filled steel tubular pump, ultrasonic pulse method was used to inspect and identify the quality of the main concrete filled steel tube.

Spiral pipe (spiral submerged arc welded pipe) into a steel unit, multi-roll rolled strip gradually rolled up to form a gap opening pipe, squeeze roll reset adjustment, in 1 ~ 3mm, weld gap control and welding end of the rinse . 1. If the gap is too large, resulting in reduced proximity effect, lack of eddy current, poor weld crystallization, indirect fusion or cracking bad. 2. The gap is too small, resulting in increased proximity effect, excessive welding heat, causing the weld to rupture; weld or extrusion, the formation of pit after rolling, affecting the weld surface quality.

The so-called macro-cell corrosion, refers to the galvanic action, refers to the pipeline by a few centimeters far or even a few meters of corrosion caused by the anode and cathode areas. Macro battery corrosion, also known as local corrosion. The corrosion rate of macro cells is related to the soil resistivity except for the anode and cathode electrode processes, since the anode and cathode zones occupy a substantial proportion of the total resistance of the corrosion cell circuit. Large cell erosion rates reduce soil resistivity. This is due to large cell erosion in buried pipelines or plaque-like corrosion on the surface, which can be quite damaging.

Domestic high-precision seamless steel pipe generally increases the performance of the material by adding ways. After the metal-alloy and seamless steel pipe are cold-drawn, stress relief annealing is needed to eliminate the residual stress of the material, improve the structure of the material and improve the plasticity of the material so as to achieve To prevent the failure of seamless steel pipe fracture failure purposes.

Large diameter LSAW steel pipe hydraulic pressure test machine pressure test, the first seal through the test straight seam steel pipe in the exhaust pipe through the exhaust valve filling the two ends of the filling process and low pressure water seal, water After the full low-pressure, high-pressure water jet device through the booster tube to the specified test pressure. After reaching the predetermined test pressure for a predetermined dwell time, if the straight seam steel pipe leaks, the deformation is relieved in the pressure test. Then open the face seal, low-pressure drainage, straight seam steel pipe testing, inspection visual inspection station for suspicious penetration. Record the automatic recording device according to the standard pressure curve of the pressure test process.

Spiral submerged arc welded pipe in the production process, we need to pay attention to a series of problems. In addition to the following test items, according to API standards and other relevant standards and some special requirements of users, but also need to destructive testing of steel pipe, steel pipe, etc., including physical and chemical properties of raw materials into the factory sampling, visual inspection of 100% steel.

Spiral submerged arc welded pipe surface quality is poor because of the two scars easily: (1) uneven quality of low quality spiral steel material. (2) low-quality materials manufacturers to guide and protect the equipment is not good, easy to stick steel, easy to produce these impurities after the scrunchy roller scarring.

Handling Vehicle Requirements of SSAW Steel Pipe

Requirements of spiral submerged arc welded pipe hot rolled strip

Spiral submerged arc welded pipe also has its own shortcomings, the spiral pipe section as a large number of pipeline fluid, such as the transmission of oil, natural gas, gas, water and some solid materials such as pipes. The same low bending strength compared to other steel and solid bars, an economical section steel, is widely used in the manufacture of structural and mechanical parts such as drill pipe, drive shaft, bicycle frame and steel scaffolding.

Selection Index of Spiral Submerged Arc Welding Steel Tube Die Casting Machine

According to the spiral submerged arc welded pipe corrosion mechanism, has put forward a variety of protective measures, this protection can basically be divided into the following types: