Acid-corrosion-resistant X70MS pipeline steel hot rolled coil and manufacturing method thereof

Abstract

The invention provides an acid-corrosion-resistant X70MS pipeline steel hot rolled coil and a manufacturing method thereof. The acid-corrosion-resistant X70MS pipeline steel hot rolled coil comprisesthe following components including, by mass, 0.03% to 0.10% of C, 1.10% to 1.40% of Mn, 0.10% to 0.20% of Si, 0.010% to 0.030% of Al, 0.15% to 0.55% of Cr, 0.15% to 0.45% of Mo, 0.005% to 0.025% of Ti, 0.050% to 0.080% of Nb, 0.020% to 0.040% of V, 0.15% to 0.30% of Ni, not larger than 0.0002% of B, not larger than 0.012% of P, not larger than 0.0020% of S, not larger than 0.0060% of N, not largerthan 0.0018% of O, not larger than 0.0005% of H and the balance Fe and inevitable inclusions. Compositions and mechanical property of the acid-corrosion-resistant pipeline steel X70MS products meet the API 5L standard, the acid corrosion resistance performance meets international HIC resistant and SSCC resistant related standard requirements, the good welding technology performance is obtained, and the requirements for producing materials for oil and gas pipelines are met.

Description

technical field [0001] The invention relates to the field of metal smelting, in particular to an acid corrosion-resistant X70MS pipeline steel hot-rolled coil and a manufacturing method thereof. Background technique [0002] Acid-resistant pipeline steel is mainly used to transport oil and gas pipelines rich in acidic media. The main demand is for export and oil and gas field gathering and transportation pipelines in southwest China and other places. With the increase of oil and gas resource development, the quality of oil and gas in the world has been declining in recent years Trend, Cl in oil and gas - , SO 4 2- iso-salt content and CO 2 The content of acidic substances such as sulfide and sulfide increases. At the same time, the application of ultra-large pipe diameter and high-pressure conveying technology increases the erosion corrosion and corrosion fatigue of pipeline steel fluid, which puts forward higher requirements for the strength and corrosion resistance of p...

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