Low-cost X80 pipeline steel and manufacturing method thereof

Abstract

Low-cost X80 pipeline steel and a manufacturing method thereof are disclosed. The steel comprises following components by weight: 0.065-0.085% of C, 1.0-2.0% of Mn, 0.25-0.35% of Si, 0.10-0.25% of Cu, 0.10-0.30% of Ni, 0.10-0.50% of Cr, 0.02-0.04% of Nb, 0.005-0.03% of Ti, 0.02-0.04% of V, 0.02-0.06% of Alt, not more than 0.006% of Ca, not more than 0.015% of P, not more than 0.003% of S and not more than 0.012% of N, with the balance being Fe and trace unavoidable impurities. A hot rolling process is controlled as follows: a slab heating temperature is 1100-1200 DEG C, a recrystallization zone rolling temperature is 900-1150 DEG C, a non-recrystallization zone rolling temperature is 700-950 DEG C, a finish rolling temperature is 700-800 DEG C, a finish cooling temperature is 350-450 DEG C, and a cooling speed is 10-25 DEG C / s. Advantages and effects of the steel and the method are that: the adding amount of alloy elements is reduced, and the steel and the method have advantages of low cost, good production efficiency, good product comprehensive performance, and the like.

Description

technical field [0001] The invention belongs to the technical field of pipeline steel production, and in particular relates to a low-cost X80 pipeline hot-rolled steel plate and a manufacturing method thereof. Background technique [0002] In recent years, the changes in energy structure and the increase in energy demand have greatly promoted the development of long-distance oil and gas transmission pipelines. In order to improve transmission efficiency and reduce engineering investment, it has become an inevitable trend to develop steel for long-distance oil and gas transmission pipelines to high-grade steel. [0003] Under the same transportation conditions, the application of high-grade pipeline steel products can reduce the wall thickness of steel pipes, save steel consumption, reduce engineering investment and improve construction efficiency; or increase the transportation pressure under the condition of constant pipe diameter and wall thickness , to achieve the purpos...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems of low toughness and high cost of the above-mentioned steel for pipelines, the present invention provides a low-cost X80 hot-rolled steel plate for pipelines and its production method, so as to reduce the investment in alloy cost and manufacturing process of X80 pipeline steel, and improve the quality of the product. Comprehensive performance for cost-effective production

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