Hot-rolled flat plate for X80 high-wear-resistant hot-bending elbows and production method of hot-rolled flat plate

Abstract

The invention provides a hot-rolled flat plate for X80 high-wear-resistant hot-bending elbows and a production method of the hot-rolled flat plate. The hot-rolled flat plate comprises the following raw components by weight: 0.16% to 0.23% of C, 0.25 % to 0.45% of Si, 1.30% to 1.65% of Mn, 0.008% to 0.025% of Ti, 0.015% to 0.06% of Al, 0 to 0.020% of P, 0 to 0.004% of S, 0.0005% to 0.0010% of B, and the balance Fe and unavoidable impurities. According to the production method, rolling adopts the controlled rolling and controlled cooling technology, the slab heating temperature is 1200 to 1280 DEG C, the rough rolling temperature is 1080 to 1200 DEG C, the finish rolling temperature is 880 to 1050 DEG C, the cooling speed after rolling is 25 to 40 DEG C / s, the finish cooling temperature is 300 to 375 DEG C, and then air cooling is carried out. Due to adoption of the hot-rolled flat plate and the production method, the production cost is lowered by about 15%; and the steel plate is easy to mold at high temperature, and high in hardness at room temperature, and has good molding stability and abrasion resistance.

Description

technical field [0001] The invention belongs to the field of low-carbon micro-alloy steels, and in particular relates to a production method for manufacturing high-pressure and large-diameter oil and gas pipeline hot-bending steel and hot-rolled flat plates. Background technique [0002] Elbow is one of the important pipe fitting products on the pipeline. It mainly plays two roles on the pipeline. One is to change the direction of the pipeline according to the needs; The tensile and compressive stress and torque attached to the straight pipe due to the change of external environment temperature. For a long time, most of the bends used in long-distance pipelines with small curvature radius have been hot-simmered bends. The main failure mode is the thinning of the wall thickness caused by long-term wear. With the continuous increase of the delivery pressure, this wear phenomenon is more prominent. . [0003] my country's elbow manufacturing adopts GB / T12459-1990 and SY / T5257...

AI Technical Summary

Problems solved by technology

Due to the lower carbon content and more other alloying elements in this invention, the production cost is higher, the hardness is not high, and the wear resistance is poor

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