X65QO Φ457 mm×25.4 mm large diameter development and application
Keywords: X65QO; large diameter; deep sea submarine; seamless steel tube
IX65QO Large-diameter seamless steel pipe introduction
Large-diameter deep-sea submarine seamless steel pipes are an important part of deep-sea submarine engineering, which is mainly used for the installation of pipelines, such as cables, exhaust pipes and fuel supply pipelines. The larger the diameter of the steel pipe, the higher the requirements for its functionality and safety of use. X65QO steel seamless pipe is a kind of large-diameter seamless steel pipe developed by our company, which is a special steel pipe used in deep-sea submarines. Through application practice, we found that compared with other similar products, its performance is more perfect. It has a certain strength, good bending and expansion performance, and can meet the application requirements of deep-sea submarine.
X65QO steel seamless pipe Characteristics:
X65QO steel seamless pipe for deep-sea submarine has excellent performance. It is made of high-quality original steel with a specific chemical composition and heat treatment technology, so it has good mechanical properties, including high yield strength, and impact toughness. At the same time, X65QO steel has good hot plasticity, and its plasticity mainly needs to withstand working pressure and pressure pulsation, as well as other fatigue loads in the deep sea environment, such as shock waves and wave forces. The cross section and wall thickness of the X65QO steel seamless pipe can be designed reasonably according to the working requirements, and the structure is optimized to meet the mechanical performance requirements and achieve the maximum ultimate tensile strength.
X65QO steel seamless pipe Production Process:
The production of X65QO steel seamless pipe traditionally uses hot extrusion and rotary piercing method. The production process mainly includes blooming, personal hot extrusion, rotary piercing, heat treatment and cold drawing. The hot-rolled steel blank is heated to 1150°C-1200°C. After that, it enters the personal hot extrusion machine for seamless tube with a reduction rate of 5-14%, and then enters the rotary piercing machine, which is heated with radiation and convective heating to obtain hot-rolled tube with a diameter of 457 mm and a wall thickness of 19 mm. After that, the hot-rolled tube is placed in a natural cooling box and then enters the cold drawing machine. The seamless steel pipe is subjected to cold drawing to obtain the required outer diameter and wall thickness. Finally, the finishing, inspection and warehousing of the pipe are carried out.
Bending and Expanding Test
In order to ensure the mechanical properties of the X65QO seamless steel pipe for deep-sea submarine, all the produced pipes must be tested in bending, flattening, and expanding test according to the national standard. The test results indicate that the ratio of the bending angle to the wall thickness is not less than 2.5, and the degree of flattening and expanding is not greater than 2.5 percent. That is to say, the degree of deformation does not exceed 25% of the wall thickness of the pipe. According to the test results, it is proved that X65QO seamless steel pipe for deep-sea submarine has good flexibility, high strength and reliable performance.
X65QO steel seamless pipe for deep-sea submersible has a relatively wide application range, and its performance is reliable. The steel pipe produced by our company has excellent mechanical properties and reasonable economic value, which can meet the application requirements of deep-sea submarine. The successful development of X65QO steel tube with diameter of 457 mm and wall thickness of 25.4 mm has laid the technical foundation for the further development of large-diameter deep submarine steel tube.
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