A kind of hot-rolled pickled steel strip for 450mpa grade oil well pipe and its manufacturing method
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A technology of hot-rolled pickling and manufacturing methods, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve problems affecting production line production efficiency, reduce production control difficulty, stabilize performance, improve surface finish and Effect of Thickness Dimensional Accuracy
Active Publication Date: 2021-06-15
MAANSHAN IRON & STEEL CO LTD
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[0008] However, when the invention is pickling a steel strip with a thickness > 3.0mm, the speed is less than 60m / min, which affects the production efficiency of the production line
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Embodiment 1
[0037] A method for manufacturing hot-rolled pickled steel strip for 450MPa grade oil well pipes, including slab production, hot rolling and pickling production processes, specifically: converter smelting, LF furnace refining, RH vacuum degassing, continuous casting, heating, high pressure Water descaling, rolling, laminar cooling, coiling, coil uncoiling, welding, loop storage, tension levelling, continuous pickling, rinsing, drying, skin-leveling, trimming, oiling and coiling.
[0038] Among them, the RH vacuum degassing, the end target [H] ≤ 2ppm, the static cycle time ≥ 6min, open the ladle bottom blowing argon for weak stirring after breaking the air, the weak stirring argon flow rate is 10-30NL / min, the weak stirring holding time ≥10min;
[0039]In the continuous casting, the temperature of the tundish is controlled at 15-30° C. above the liquidus line, and the process of light reduction and electromagnetic stirring is adopted. Among them, the reduction position and red...
Embodiment 2- Embodiment 4
[0047] A method for manufacturing a hot-rolled pickled steel strip for 450MPa oil well pipes, except that the process parameters listed in Table 3 and Table 4 are different from those in Example 1, and the rest of the process is the same as in Example 1.
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Abstract
The invention provides a hot-rolled pickling steel strip for 450MPa grade oil well pipes and its manufacturing method. Through the design of reasonable smelting, continuous casting, hot rolling and pickling processes, three acid pickling strips are designed based on the continuous pickling production unit. The temperature of the acid solution in the tank is uniform, adopting the process of pickling first and then smoothing, the pickling speed can be controlled in a large range, and the production efficiency is high, which can reduce the production preparation time and reduce the difficulty of production control, and the produced tissue is ferrite +Pearlite, hot-rolled pickled steel strip for tubing with stable coil performance and good formability.
Description
technical field [0001] The invention belongs to the technical field of steel production technology for oil well pipes, and in particular relates to a hot-rolled pickling steel strip for 450MPa grade oil well pipes and a manufacturing method thereof. Background technique [0002] The purpose of pickling is to remove the oxide scale on the surface of the strip, trim the edge, and coil to provide raw materials with smooth surface and high dimensional accuracy for the subsequent process. Some continuous pickling production lines are also equipped with a skin pass unit, which can be used to replace the cooling process in some cases. Rolled products, and its energy consumption is much lower than that of cold-rolled products, which meets the requirements of low-carbon and energy-saving, and has a relatively broad space for development. [0003] The patent CN 106862270 A "A production process for thick-gauge hot-rolled pickling plate" published on June 20, 2017 discloses a method fo...
Claims
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