Corrosion-resistant steel for natural gas transmission pipelines

Abstract

The invention discloses corrosion-resistant steel for natural gas transmission pipelines, which comprises the following components by weight percent: 0.10 to 0.14 percent of C; 0.5 to 0.8 percent of Si; 1.30 to 1.50 percent of Mn; 0 to 0.008 percent of P; 0 to 0.003 percent of S; 1.3 to 1.5 percent of Cr; 0.3 to 0.7 percent of Ni; 0.25 to 0.45 percent of Nb; 0.005 to 0.01 percent of B; 0 to 0.15 percent of Cu; 0.020 to 0.050 percent of Al; 0.030 to 0.10 percent of N; 0.05 to 0.10 percent of V; and Fe and unavoidable impurities in balancing amount.

Description

technical field [0001] The invention relates to the field of iron and steel materials, in particular to a corrosion-resistant steel used for natural gas pipelines. Background technique [0002] Corrosion is a common phenomenon in the oil and gas industry, often causing significant economic losses to oil and gas fields and seriously polluting the environment. Common corrosion damage in sour oil and gas fields is usually divided into two types: one is uniform corrosion and local corrosion caused by the dissolution of anode iron during the electrochemical reaction process, which is manifested as local corrosion such as wall thickness reduction and pitting perforation of metal facilities that are increasing day by day The other type is the cathodic precipitation of hydrogen atoms during the electrochemical reaction process, and after entering the steel, it leads to two different types of cracking in metal components, namely, sulfide stress cracking (Sulfide Stress Cracking, SSC)...

AI Technical Summary

Problems solved by technology

The content of C in CN1811002A is low, no micro-alloying treatment of V element is added, the requirements for the content of P and S are not high, and no new technology is provided to solve the negative effects caused by P and S

The high-toughness anti-hydrogen sulfide gas transmission pipeline steel disclosed by CN1351189 has very low P and S content requirements, high manufacturing cost, and is difficult to realize in the current industrialized production

CN01126611.2 discloses "a kind of low-carbon alloy steel and its produced pipe". The invention relates to a low-carbon low-alloy steel and its produced pipe. The technical problem to be solved is to increase the strength and toughness of the alloy steel and improve the hardenability And welding performance, impact performance is not very ideal, a variety of precious metals are added, the production cost is high, and the corrosion resistance performance is not considered. media requirements