The surface quality of the hot rolled coil is easy to control and the quality is high.3% higher than the standard.72mm casing was also used in the Texas oil field in the United States, and the same effect was obtained.7mm series oil and casing. J55 steel grade oil, casing down to a depth of about 2400m.02mm, φ139.Seamless steel pipe: The hot-rolled forming process is used. Therefore, the outer diameter is controlled accurately and the fluctuation range is small, which is helpful to eliminate black leather buckles.
The raw material composition, cooling conditions, and cooling conditions of the rolls have a large impact on the outer diameter of the steel pipe.94mm. ERW steel pipe uses hot rolled coil as the raw material. Wall thickness toleranceERW steel pipe: using hot-rolled strip as the raw material, the thickness tolerance of modern hot-rolled strips can be controlled within 0.2.
The control accuracy limit of the difference in wall thickness of the seamless steel pipe is + 5% t, which is generally controlled at + 5 ~ 10% t.Seamless steel pipe: The limit of wall thickness control accuracy is 0. By controlling the impurity content of raw materials, the height and direction of longitudinal burrs, the shape of the forming edge, the welding angle, and the welding speed , Heating power and frequency, welding extrusion amount, intermediate frequency withdrawal temperature and depth, air cooling section length and other process parameters ensure that the impact energy R134a Refrigerant bottle of the weld reaches more than 60% of the base metal, if further optimized, it can achieve the impact energy of the weld close to the mother MaterialAchieve seamless performance.In order to ensure that its minimum wall thickness can meet the standard requirements and use performance, it can only be solved by appropriately increasing the wall thickness. The reason is that the performance of the raw material and hot-rolled strip of ERW steel pipe is guaranteed by means of micro-alloying smelting, refining outside the furnace, and controlled cold and controlled rolling; seamless steel pipes mainly rely on means of increasing carbon content, which is difficult to ensure strength and plastic Reasonable match. The subsequent hot rolling can partially eliminate the wall thickness.
Tags: Charging Pipe
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