X80 pipeline steel coil with low cost and high toughness and production method thereof

Abstract

The invention relates to an X80 pipeline steel coil with low cost and high toughness and a production method thereof, belonging to the technical field of low-alloy steel. The X80 pipeline steel coil comprises the following chemical components by percent: 0.03-0.07 percent of C, 0.10-0.25 percent of Si, 1.25-1.95 percent of Mn, at most 0.018 percent of P, at most 0.005 percent of S, 0.06-0.12 percent of Nb, 0.15-0.30 percent of Mo, 0.008-0.020 percent of Ti, 0.15-0.35 percent of Cr, 0.020-0.045 percent of Als, 0.0015-0.0035 percent of Ca, at most 0.0060 percent of N and the balance of Fe and inevitable impurities. The X80 pipeline steel coil disclosed by the invention has the advantages of simple component design and low production cost, and a lot of precious metal resources are saved. Meanwhile, the X80 pipeline steel coil has higher mechanical property and good impact toughness and has a wide market promotion prospect.

Description

technical field [0001] The invention relates to a low-cost high-strength toughness X80 pipeline steel coil plate and a production method thereof, belonging to the technical field of low-alloy steel. Background technique [0002] X80 is a classified model of high-strength pipeline steel. Large-diameter welded steel pipes for transporting oil and natural gas are made of pipeline steel hot-rolled coils or wide and thick plates. During use, in addition to high compressive strength, high low-temperature toughness and Excellent welding performance. With the continuous increase of demand for oil and natural gas, the transmission pressure and pipe diameter of the pipeline are also continuously increased in order to increase the transmission efficiency of the pipeline. Considering the structural stability and safety of the pipeline, it is necessary to increase the thickness of the pipe wall and improve the strength of the pipe, so the pipeline steel used for this type of pipeli...

AI Technical Summary

Problems solved by technology

In order to obtain better performance, at present, the method of adding a large amount of precious alloying elements (such as niobium, molybdenum, copper, nickel, etc.) is generally used, which not only consumes a lot of precious metal resources, but also greatly increases the production of X80 pipeline steel coils cost

In the background technology, Chinese patent CN 1715434A, titled high-strength and high-toughness X80 pipeline steel and its hot-rolled plate manufacturing method, has a high alloy element content, such as Mo element content 0.32%, Cu element content 0.24%, Ni element content 0.27% %, etc., and its thickness specification is relatively thin, and the maximum thickness is not more than 14.6mm; Chinese patent CN 101413090A, the name is a kind of X80 hot-rolled coil for high-strength and toughness spiral submerged arc welded pipe and its production method, and its content of alloy elements is relatively high. For example, the Mo element content is 0.24%, the Cu element content is 0.24%, and the Ni element content is 0.24%. The production cost is very high; Chinese patent CN 102021497A, the name is a kind of X80 pipeline steel hot-rolled coil and its manufacturing method, although the X80 chemical composition It has been optimized, but its alloy element content is still high, such as Cu element content 0.19%, Ni element content 0.19%, etc.

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