Acid-resistant pipeline steel and pipe making method

Abstract

The invention discloses acid-resistant pipeline steel and a pipe making method, and relates to the field of steel and iron materials. The acid-resistant pipeline steel comprises the chemical compositions of, by mass, 0.014%-0.024% of C, 0.10%-0.35% of Si, 0.60%-0.80% of Mn, less than or equal to 0.012% of P, less than or equal to 0.0010% of S, 0.030%-0.070% of Nb, 0.006%-0.020% of Ti, 0.10%-0.30%of Ni, 1.00%-1.10% of Cr, 0.15%-0.20% of Mo, 0.10%-0.30% of Cu, 0.010% of V, 0.015%-0.050% of Al, and the balance Fe and impurities. According to the acid-resistant pipeline steel and the pipe makingmethod, unique composition design is adopted, pipe making is carried out through edge milling, prebending, forming, welding, flaw detection, hole enlargement and hydraulic testing and other processesto meet the pipe making requirements of the acid-resistant pipeline steel.

Description

technical field

[0001] The invention relates to the field of metallurgy, in particular to an acid-resistant pipeline steel and a pipe-making method. Background technique

[0002] Iran, Myanmar, India, Abu Dhabi, Russia, and other countries have huge crude oil reserves. my country imports more and more crude oil from these regions. Pipeline transportation not only has low transportation costs and fast transportation speed, but there is acid corrosion of crude oil through pipelines. Therefore, it is imminent to develop anti-acid pipelines of different specifications, and it has always been a challenge to be able to apply anti-acid stability of different specifications.

[0003] The acid-resistant and corrosion-resistant pipeline steel is mainly resistant to HIC and SSC. Hydrogen sulfide is a weakly acidic electrolyte. It exists in the form of molecules in aqueous solutions with a pH of 1 to 5. Hydrogen sulfide reacts with metals: H 2 S+Fe→FeS+2H generates atomic hydrogen, H 2...